JPS5838324B2 - Vehicle air conditioning control method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle air conditioning control method and apparatus that link temperature control and air blowing change control.

Conventionally, in this type of device, a mechanical continuous mechanism is used to link the mechanical displacement of the temperature adjustment member and the mechanical displacement of the air outlet switching member so that air at an appropriate temperature is blown out from a predetermined air outlet. It is common practice to use it.

Recently, there has been a demand for reducing energy consumption in this type of device by changing the heat exchange capacity in the air conditioning function section.

However, in the conventional device described above, the mechanical displacement amount of the temperature control member and the mechanical displacement amount of the outlet switching member always correspond to each other. There is a problem that it becomes impossible to cope with the temperature of the user, causing discomfort to the user.

For this reason, in the control method according to the present invention, the temperature of the blown air blown into the passenger compartment from the air conditioning function section is determined according to the control conditions including the passenger compartment temperature and the external temperature. In the air conditioning control method for a vehicle, the blowing direction of the blowing air is changed according to a comparison between the determined temperature of the blowing air and a reference temperature, and the blowing direction of the blowing air according to the comparison is changed. The present invention is characterized in that the relative difference between the air temperature and the reference temperature is corrected in accordance with the temperature of either air from inside the vehicle interior or from outside the vehicle interior, which is selectively introduced into the air conditioning function section.

To explain this in relation to the embodiments to be described later, the temperature of the above-mentioned blown air can be indicated by the adjustment position of the temperature adjustment member included in the air conditioning function section.

The reference temperature mentioned above is also indicated as a reference position with which the adjustment position is to be compared.

When comparing these adjustment positions and the reference position, in order to correct the relative difference between the two, one of the reference positions is adjusted according to the cabin temperature 6 if the inside air is being taken in, or if the outside air is being taken in. If the condition is correct, it is attempted to be corrected depending on the outside temperature of the vehicle.

The control device of the present invention, which implements such a control method and in particular can perform temperature change control and nitrogen blowing direction change control using a common control condition generating means, has the configuration shown in FIG. 17. It has the characteristics of

In addition, in FIG. 17), the reference numerals or symbols in parentheses correspond to those described in the description of the embodiment and the drawings to be described later.

First, a vehicle air conditioner to which the present invention is applied includes a ventilation duct 10 for sending air toward the vehicle interior, a blower motor 14 that generates an air flow toward the vehicle interior VC in the ventilation duct, and the ventilation duct 13. A selection 13 for selecting the intake of air into the vehicle interior 11 or the exterior 12 of the vehicle; a heater 16 and a cooler 15 disposed in the ventilation duct exchange heat with the air flow and supply the heat; It is equipped with a heat exchange means TR that can adjust the amount of exchange, and a direction changing means 21 that changes the direction of the air flow from the ventilation duct to the single room.

The control device of the present invention has, as control condition generating means, an inside temperature detection stage 60 that generates a first signal S1 corresponding to the actual temperature inside the vehicle interior, and a second signal S2 that generates a second signal S2 according to the temperature outside the vehicle interior. 1,000 stages of outside temperature detection 61, a 1,000 stage setting 63 that generates a third signal S3 corresponding to the target set temperature in the vehicle interior, and a fourth signal S4 that corresponds to the adjustment amount of the heat exchange means TR. It includes an adjustment amount detection means 62, and these first to fourth signals are applied to the digital control stage 1.

The digital control means 1 includes the following first to seventh function realizing means.

First means a for determining whether the selection state of the selection means 13 is in the inside air intake state or in the outside air intake state.

Second means b0 for determining whether the operating state of the cooler 15 is in the operating state or in the stopped state For those to be controlled, the digital control means itself can determine their respective states.

A. The first control condition obtained in 1,000 stages 6 0-6 3
, a first control output signal C indicating the amount of heat exchange in the heat exchange means based on the second, third, and fourth signals S1-84.
The third thousand stages C yielding S1.

The first control output signal CS1 generated by this third thousandth stage C is applied to a first electrical drive means EM1 which regulates the amount of heat exchange in the heat exchange means TR, thereby making it possible to The temperature of the air supplied to the compartment vC is adjusted and controlled so that the temperature of the compartment vC is maintained close to the set target temperature.

The fourth means d, the fifth means e, and the sixth thousand steps f are:
The fourth means d functions to correct the relative difference in the comparison between the reference drinking position in the air blowing direction and the actual drinking position.
produces a constant first reference signal R1 when the second means b determines that the cooler is in an operating state (on), and the fifth means e generates a second reference signal R1. When it is determined that the cooler is in the stopped state by the means b of , and that it is in the inside air intake state by the first stage a, the second reference corrected by the first signal S1 is determined. The sixth means f generates a signal R2, and the second means b determines that the cooler is in a stopped state, and the first means a determines that the selection means is in an outside air intake state. Sometimes a third reference signal R3 is generated which is corrected by the second signal S2.

However, the means d, e, f for correcting these relative differences are, when the cooler 14 is in a stopped state, a first signal S1 corresponding to the inside air temperature in the inside air intake state, and a first signal S1 corresponding to the inside air temperature in the outside air intake state. A reference signal R1-R3 produced in a corrected manner is generated with a second signal S2 that is dependent on the outside temperature.

Thus, the first, second or third reference signal Rl-R3 obtained by the fourth, fifth and sixth means e-f and the fourth reference signal Rl-R3 indicating the adjustment amount of the heat exchanger means TR. The signal S4 is compared in a seventh means g, and the seventh means g
produces a second control output signal CS2 indicating the change in the blowing direction in the direction change stage 21.

This second control output signal CS2 is applied to the second electric drive means EM2, and the direction change of the direction change stage 21 is determined by this drive means EM.

In view of this problem, the present invention provides a vehicle air conditioning control method that corrects the selection of the outlet and the temperature of the blown air even when the heat exchange capacity of the air conditioning function section is changed. The purpose is to

Furthermore, the present invention employs the vehicle interior temperature and vehicle exterior temperature included in the control conditions used for temperature control for the above correction operation, thereby eliminating the need to newly set a special control condition generation means. Another object of the present invention is to provide a vehicle air conditioning control device that makes effective use of the air conditioning control system.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

This embodiment uses a known cold air/warm air mixing type air conditioner;
In other words, the temperature regulating member distributes the air supplied upstream of the temperature regulating member to the heater and its bypass passage, and the temperature of the downstream mixed air blown into the target space is adjusted depending on the distribution ratio. In an air conditioner having an air conditioning function section, the displacement amount of the temperature adjusting member and the displacement amount of the air outlet switching member are controlled in accordance with a processing order preset by a digital computer.

In FIG. 1 showing the overall system, on the upstream side of the ventilation duct 10, there is an inside air inlet 11 as an air inlet (intake) for circulating inside air (indoor air) through the interior of the vehicle, and an outside air (indoor air) An outside air inlet 12 for taking in outdoor air) is formed, and one of the two inlets is blocked by a damper 13.

The selection of the inlets 11 and 12 by the damper 13 is referred to as internal/external air switching.

A blower motor 1 is installed in the ventilation duct 10 toward the downstream side.
4. A cooler 15 consisting of a refrigerant evaporator (evaporator) of the cooling cycle 22, a heater (heater core) 16 using engine cooling water as a heat source, and air flowing through this heater 12 and air passing through a bypass passage 17. Dampers 18 are arranged in this order as temperature adjusting members for adjusting the ratio.

At the most downstream side of the ventilation duct 10, there is a 2.
Seed outlets 19 and 20 are shaped, one of which is indicated by reference numeral 19 is an upper outlet for blowing cold air towards the upper part of the vehicle interior, and the outlet 20 is designed to blow out cold air toward the lower part of the vehicle interior. This is a lower outlet for blowing out warm air.

The upper air outlet 19 and the lower air outlet 20 may each have a plurality of openings provided at appropriate locations within the vehicle interior and may be connected to each other by a duct.

One of the upper and lower air outlets 19 and 20 is closed by a damper 21.

The selection of the air outlets 19 and 20 by the damper 21 is referred to as air outlet switching.

Each element arranged in the ventilation duct 10 is a temperature control damper 1
In addition to the temperature control by 8, air conditioning is performed according to the driver's preferred driving mode.

The air conditioner described in this embodiment has operating modes such as an internal/external air switching operation, an operation in which the cooler 15 is manually switched between operation and non-operation, and an economy operation in which the cooler 15 is automatically switched between operation and non-operation. (economical driving).

When switching between inside and outside air, you can select cooling operation when the outside air temperature is quite high, inside air circulation operation when the atmosphere is dirty, or outside air intake operation when the inside air is dirty.

Furthermore, switching between inside and outside air may be performed automatically in conjunction with other driving modes.

For example, when the cooler 15 is in the non-operating mode and the target indoor temperature cannot be obtained in the internal air circulation mode, the damper 13 automatically switches to outside air and enters the outside air intake mode.

The selection of whether to activate or deactivate the cooler 15 can be made when desiring cooling operation when the outside air temperature is high or when using the cooler 1 for dehumidification.
It is used when you want to use 5 or when you want to reduce the room temperature when the outside temperature is sufficiently low.

In the economy operation, it is determined whether or not the operation of the cooler 15 is necessary to obtain the target indoor temperature change, and the operation or non-operation of the cooler 15 is automatically controlled. Used to reduce driving time and prevent consumption of driving energy.

The cooling cycle 22 including the cooler 15 includes a compressor (refrigerant compressor) 2 driven by a propeller shaft of an engine 23 as an automobile prime mover via a belt or the like.
4, a condenser 25, a liquid receiver 26, and an expansion valve 13 are connected to the cooler 15 through piping.
A heat cycle is formed in which the heat of the air introduced in step 5 is absorbed by the refrigerant.

The temperature of the air that has passed through the cooler 13 is approximately 0.degree. C., and has little to do with the temperature of the introduced air and the rotational speed of the compressor 24.

The operation and non-operation of the cooler 15 approximately correspond to the operation of the cooling cycle 22.

The cooling cycle 22 is driven by a compressor 24 which is its driving source.
The engine 23 is stopped and operated by disconnecting and disconnecting the mechanical connection mechanism between the engine 23 and the engine 23.

The heater 16 is connected to a cooling water pipe connected to a cooling water bracket of the engine 23, and has a heat exchange function to release heat of the cooling water heated by the engine 16.

The flow path adjustment valve 28 adjusts the flow path of the cooling water according to the cooling water temperature.
The heater 16 is adjusted by a bit and a radiator (not shown), so that the heater 16 also has a substantially constant heat exchange capacity.

In order to control the temperature and the operation mode, the cooling cycle 22, the inside/outside air switching damper 13 in the ventilation duct 10, the temperature adjustment damper 18, and the outlet switching and damper 21 are driven by electric signals.

The electromagnetic clutch 50 connects and connects the mechanical connection between the compressor 24 and the engine 23, and connects the clutch to rotate the compressor 24 when energized via the power line 50a, and connects the clutch to rotate the compressor 24 when deenergized. The clutch is disengaged to stop the compressor 24.

The rotating state of the compressor 24 is called on, and the stopped state is called off.

The inside/outside air switching damper 13 is driven by a negative pressure actuator consisting of a diaphragm actuator 51 and a three-way switching solenoid valve 52 that switches between atmospheric communication and engine negative pressure communication.

When the three-way switching solenoid valve 52 is energized via the power supply line 52a, negative pressure is supplied to the diaphragm actuator 51, and the damper 13 is moved relatively in the direction of the broken line arrow from the outside air introduction state shown in the figure via the coupling mechanism 51a. Rapidly pull it into a shy state,
When the electromagnetic valve 52 is deenergized, atmospheric pressure is supplied to the diaphragm actuator 51, and the spring force 4 (not shown) pushes the damper 13 back to the shown position (outside air introducing state).

The temperature control damper 18 includes a diaphragm actuator 53 and two solenoid valves 5 that control engine negative pressure communication and atmospheric communication.
4. When the solenoid valve 54 is energized by the power line 54a, negative pressure is supplied to the diaphragm actuator 53, and the damper 1B is slowly moved in the direction of the arrow via the coupling mechanism 53a. Pull, power line 5
When the solenoid valve 55 is energized by the solenoid valve 5a, atmospheric pressure is supplied to the diaphragm actuator 53, and the damper 18 is slowly pushed back by a spring (not shown).

When both solenoid valves 54,55 are deenergized, the diaphragm actuator 53 is stopped and the damper 13 is stopped and held in its current position.

Note that the opening degree of the damper 18 is 100% when the bypass passage 17 is fully closed (maximum heating position), and the opening degree of the damper 18 is 100%.
When the upstream side of the heating system is fully closed (maximum heating position), it is defined as O.

The outlet switching damper 21 is driven by a negative pressure actuator consisting of a diaphragm actuator 56 and a three-way switching solenoid valve 57 that switches between atmospheric communication and engine negative pressure communication.
When the solenoid valve 57 is energized by the solenoid valve 7a, negative pressure is supplied to the diaphragm actuator 56, and the damper 21 is relatively quickly pulled from the illustrated position (lower Suita) via the coupling mechanism 56a to create an upper blowout, and the solenoid valve When 5T is de-energized, diaphragm actuator 5
Atmospheric pressure is supplied to damper 21 by a spring (not shown).
Push back to the position shown.

The control device 1 includes the electromagnetic clutch 5, which is an electrically driven member.
0, the solenoid valves 52, 54, 55, and 57 are switched between energization and deenergization to instruct temperature control and control of each operation mode.

Further, the control device 1 is connected to various information input means for temperature control and control of each operation mode, and processes input information based on a control program set internally in advance to control the electrical control members. Activate.

The blower motor 14 rotates when energized by the power line 14a to create a flow of air within the ventilation duct 10.

The blower motor 14 operates regardless of the target temperature and operating mode as long as the air conditioner is in operation.

As a means for inputting various information to the control device 1, an inside temperature sensor 60 is installed in a small passage provided at the upstream part of the ventilation duct 10 so that inside air passes through, and generates a signal according to the inside air temperature. An outside temperature sensor 6 is installed in a place such as the front of the radiator grill in a place that receives as little ventilation and radiant heat from the engine as possible, and generates a signal according to the outside temperature.
1. There are an opening sensor 62 that generates a signal according to the opening (position) of the temperature control damper 18, and an operation panel 2 installed near the control device 1.

Although the control device 1 is installed near the air conditioner, the operation panel 2 may be installed, for example, on an instrument panel in front of the driver's seat.

The operation panel 2 includes a temperature setting device 63 that generates a signal according to the setting of the target internal air temperature, and a temperature setting device 63 that operates the air conditioner.
A main switch 64 for commanding non-operation, a switch 65 for selecting operation or non-operation of the cooler 15 (hereinafter referred to as an air conditioner switch) as a switch for selecting an operation mode, and a switch 65 for selecting operation or non-operation of the cooling cycle, and a suction port or indoor air An inlet changeover switch 66 that selects between the inlet 11 and the outside air inlet 12, an economy switch 67 that selects economy operation, and a short-time inlet switch (hereinafter referred to as a short inlet switch) that makes the inlet the inlet 11 for a few minutes. )6
8 is provided.

Further, the operation panel 2 may be provided with display means for displaying the internal air temperature under control.

Power is supplied to the device from an on-vehicle battery 3 via an ignition key switch 4.

FIG. 2 is a wiring diagram showing mutual electrical connections between the control device 1, various information input means, and electrical control members.

Among the information input means, the inside temperature sensor 60, the outside temperature sensor 61, the damper opening sensor 62, and the temperature setting device 63 on the operation panel 2 input respective generated signals to the control device 1 in the form of analog voltage signals.

Therefore, heat-sensitive low-resistance elements such as thermistors are used as the inside temperature sensor 60 and the outside temperature sensor 61, and the analog voltage generated at the terminals when energized is transmitted to the signal lines 60a and 61a.
It is connected to the control device 1 via.

Among the various switches on the operation panel 2, the air conditioner switch 65, the inlet changeover switch 66, and the economy switch 67
One end of the short internal switch 68 is grounded, and the other end is connected to the control device 1 via an open/close contact.The first three are operation memory type switches, and the remaining short internal switch 68 is a self-reset type switch. It is.

As will be described in detail later, when the short air switch 68 is closed, this fact is held as an electrical signal within the control device 1.

The main switch 64 on the operation panel 2 (one end is connected to the ignition key switch 4 and the other end is connected to the blower motor 14 and the electrical drive members 52, 54, 55, 57
It is connected to.

Since the other end of the blower motor 14 is connected to the power supply line, the blower motor 14 rotates while the main switch 64 is closed.

The other ends of the power lines of the electric drive members 52, 54, 55, 57 are connected to the control device 1, and the power line 50a of the electromagnetic clutch 50 among the electric drive members is also connected to the control device 1. A power supply path is established via the control device 1.

The operating power for the control device 1 is supplied through the ignition key switch 4 without going through the main switch 64.

Therefore, the ignition switch 4 is used as the control device 1.
It operates when it is closed.

However, as described above, unless the main switch 64 is closed, the power supply to the blower motor 14 and the electrical drive member will not be established, so the control device 1 is kept in a standby state during that time.

The control device 1 includes a microcomputer 100 as a functional component that controls the entire air conditioner.

The microcomputer 100 described in this embodiment is
It is a 4-bit one-chip microcomputer MB8841 manufactured by Fujitsu Limited, which has built-in ROM, RAM, I/O ports, timers, etc. in addition to a CPU.

The MB8840 series user manual published by Fujitsu Ltd. can be used for its internal structure, pin connections, intake, etc.

The control device 1 includes coupling and processing circuits for operatively coupling the microcomputer 100 with information manpower means and electrical drive elements.

First, as a circuit for inputting an analog signal to the microcomputer 100, a preamplifier circuit group 110, an analog multiplexer 120, and an analog-to-digital conversion circuit (A-D conversion circuit) 130 are used.

The preamplifier circuit group 110 includes individual preamplifier circuits 1 1 1 , which independently preamplify each signal from the inside air sensor 60 , the outside air sensor 61 , the damper opening sensor 62 , and the temperature setting device 63 . It consists of 1 1 2, 113, 114.

For elements whose total resistance changes, such as the inside air sensor 60 and the outside air sensor 61, the circuit shown in FIG. 3 is used as the preamplifier circuit 11L112.

In FIG. 3, a resistor 111a is connected in series with an element 6' representing the inside air sensor 60 and the outside air sensor 61, and the voltage at the connection point, the voltage at the connection point, the change resistance 111b, and the resistance 111c are connected in series.
The output voltage of the reference voltage generator consisting of
11a is manually operated to obtain an amplified voltage corresponding to the difference between two voltages.

In cases where the output signal is already a voltage signal, such as the damper opening sensor 62 and the temperature setting device 63, the circuit shown in FIG. 4 is used as the preamplifier circuits 113 and 114.

In FIG. 4, the damper opening sensor 62 and the temperature setting device 6
The voltage from element 6' representing 3 and the voltage from element 6' representing variable resistance 113a
and the output voltage of a reference voltage generator consisting of a resistor 113b are input to a differential amplifier circuit using an operational amplifier 113c, and an amplified voltage corresponding to the difference between the two voltages is obtained.

In the two types of preamplifier circuits shown in FIGS. 3 and 4, variable resistors 111b and 1133 adjust the amplification gain to adjust the level of the input analog signal to a level that is easy to calculate in the microcomputer 100. Used to convert to .

Analog multiplexer 120 is analog switch 1
21 , 122 , 123 , 124 and inverters 1 25 , 1 26 , 127 connected to their control gates
, 128, and each input terminal of the inverters 125 to 128 is an input/output port R of the micro-pilocessor 100.

~Pin R of R15. - Connected to R3.

The analog multiplexer 120 connects the analog switches 121 to 12 in the order instructed by the microcomputer 100 (at this time, the output from the pin becomes O level).
4 are individually turned on, and input one output voltage of the preamplifier circuit 110 to the A-D switching circuit 130 in sequence.

The A-D switching circuit 130 includes a voltage comparator 131 and a ladder voltage generator 132.
The input terminal is parallel output port 0 of the microcomputer 100.

~0. The output terminal of the voltage comparator 131 is connected to pin R4 of the input/output ports.

This type of A-D switching circuit 130 is, for example,
978) Nippondenso Public Technical Report Vol. 1 published on July 20th
1, A76 as a temperature detection circuit, but since it has been known for a long time, the explanation of its operation will be omitted.

Microcomputer 100 has parallel output port 0.

~Binary code output from 07 and input/output port R.

The analog signal can be recognized as a digital quantity depending on the input signal level of pin R4 of R15.

An on/off signal amplification circuit 140 is used as a circuit for inputting a switch signal to the microcomputer 100.

The on/off signal amplification circuit 140 generates an inverted voltage signal with a binary level depending on whether one terminal of the switches 65 to 68 used for selecting the operation mode is at ground voltage due to contact closure or in an open state. amplifier circuit 14
1, 142, 143, and 144, and each output terminal is a non-latch input port K of the microcomputer 100.

- Connected to K3. These amplifier circuits 141 to 14
4, as shown by reference numeral 141 as a typical example, when the switch contact is in the closed state, the transistor 141 is turned on and generates a 1-level signal at its collector, and when the switch contact is in the open state, the transistor 141 is turned on. It turns off and sets the collector to 0 level.

The microcomputer 100 has an input port 1-K.

- By determining whether each pin of K3 is at the 1 level or the O level, the operating states of the switches 65 to 68 can be recognized.

The microcomputer 100 drives the electromagnetic clutch 50, the electromagnetic valve 52 that drives the internal/external air switching damper 13, the electromagnetic valves 54 and 55 that drives the temperature control damper 18, and the air outlet switching damper 21, which are electrically driven members. An on/off signal amplification circuit 150 is used to switch between energization and deenergization of the solenoid valve 57.

Solenoid valves 52, 54, 55, 57 excluding the electromagnetic clutch 50
Individual amplifier circuits 151, 153, 154,
Reference numeral 155 is configured to directly energize the electromagnetic valve using two transistors 151a and 151b which operate in reverse, for example as shown in FIG.

Further, the amplifier circuit 152 that operates the electromagnetic clutch 50 is
Since a large current output is required, relay 152a is used as shown in Figure 6.
are using.

Relay drive transistor 152b is inverter 152c
The one shown in Fig. 5 also operates through the sixth
The one shown also energizes the electrical drive member when the output of the microcomputer 100 is at 0 level.

The power supply circuit 1γ0 supplies the power necessary for the operation of the control device 1. A constant voltage power supply of +5× is created from the terminal voltage of the battery 3 by a known constant voltage power supply circuit 171 and is supplied to each circuit.

In addition, the voltage as it is from battery 3 (usually 12
(2) is supplied to the on/off signal amplification circuit 150.

As a circuit attached to the microcomputer 100, there is a startup circuit 180.

The starting circuit 180 has the function of initializing the microcomputer 100 by inputting an O level signal to the RESET terminal of the microcomputer 100 for a certain period of time when a voltage of 5V is applied by closing the ignition key switch 4.

During initialization of the microcomputer 100, 1 level signals are output from all output ports.

A resistor and a capacitor are connected to the clock generator terminals Extal + Etal of the microcomputer 100 to construct an IMHz clock generator.

Microcomputer MB8841 manufactured by Fujitsu Limited
There are several other terminals not shown in the figure, but they are omitted because they are not necessary in this embodiment.

The control device 1 may further include a display signal exchange circuit 160 for displaying a change in the inside temperature when the ignition key switch 4 is closed.

For example, the exchange circuit 160 is a decoder that exchanges the binary code sent from pins R12 to R15 of the input/output ports of the microcomputer 100 into individual logic signals, so that the switching circuit 160 switches the light emitting diode group 2 according to the internal temperature.
A predetermined light emitting diode can be turned on from '.

The light emitting diode group 2' may be provided in the panel of the display.

Next, the temperature control method and each operation mode will be explained.

In FIG. T diagrammatically illustrating the operation of the air conditioner, the deviation detection unit 20 detects the deviation between the signal T2 indicating the set temperature and the signal Tr indicating the measured value of the indoor air temperature by the indoor air temperature sensor 60.
1, and according to the deviation, control object (vehicle interior air) 2
The temperature control damper 18 is driven to raise and lower the temperature of 00.

As a result, the temperature of the controlled object 200 having a predetermined heat load changes, and this change is fed back to the deviation detection unit 201 as a change in the signal Tr indicating the measured value of the inside air temperature sensor 60, and as a result, the inside air temperature Tr is The opening degree of the damper 18 is repeatedly adjusted so that the temperature approaches the set temperature T2.

However, the heat load on the controlled object 200 is not constant and changes depending on various factors.

In air conditioners for automobiles, there is a problem of a delay in the response of the control system including a delay in heat propagation in the controlled object 200. For example, there is a problem that the inside air temperature Tr cannot be kept constant in response to changes in the outside air temperature Tam. be.

Therefore, by employing predictive control, that is, by detecting disturbance elements such as the outside air temperature Tam in advance,
A correction signal is also applied to the deviation detection unit 201 at the same time that the heat load at
hold stable.

In predictive control, in order to bring the inside air temperature Tr closer to the installed air temperature T2, it is calculated experimentally in advance what kind of corrections should be made under what conditions for other elements involved in temperature control. put.

In this embodiment, the following calculation formula is used to drive the temperature adjustment damper 18.

K1=Kr+Kam+Kpo+CF+MF...
... (1) △Kpo = K2 - Kl ...
・・・・・・・・・・・・・・・・・・・・・・・・(
2) Here, the opening degree of the temperature control damper 18 is controlled so that the deviation ΔKpo converges within a certain predetermined range.

In equation (1), the term Kr for the inside air temperature and the term Ka for the outside air temperature
m and damper opening degree Kpo are obtained by multiplying the actually measured air temperature Tr, outside air temperature Tam, and damper opening degree Tpo by a predetermined gain constant, respectively.

The correction term MP is used by the air conditioner to adjust the damper opening degree accordingly when the cooler 15 is not operating (compressor is off), that is, when the temperature of the air after passing through the cooler 15 is not 0°C. used for correction.

This MF is shown as a value obtained by multiplying the inside air temperature Tr by a predetermined constant if the operation mode is the inside air type, or by the outside air temperature Tam if the operation mode is the outside air type.

The correction term CF is a correction term that is determined in response to a deviation between the set temperature T2 and the inside air temperature Tr by comparing the set temperature T2 and the inside air temperature Tr in order to make the temperature control system accurately match the target set temperature T2.

Oh, as will be explained later, in the initial state when the air conditioner starts operating, the inside air temperature Tr is not constant υ), and the correction term C
F is used for calculation after waiting for the internal air temperature Tr to stabilize.

In addition, in the predictive control of temperature control, the outside air temperature Tamu
Correction can also be made for external disturbance elements.

For example, a correction term related to the amount of solar radiation, the speed of the vehicle, the number of passengers, etc. may be added to the right side of equation (1).

The gain constants of the terms Kr, Kam, Kpo, CF, and MF in the above equation (1) are determined so that they are all added to the temperature, and therefore the added value K1 is adjusted under the conditions indicated by these terms. Controlled object 200 to be controlled
indicates the temperature of

In the above equation (2), the temperature K1 to be controlled calculated using the equation (1) is compared with the target temperature K2 and T2, and the difference ΔKpo is extracted for driving the damper.

In FIG. 7, which diagrammatically illustrates these calculations, solid rectangular frames 21L212, 213, 214, and 215 indicate the gain calculations for each term performed when performing the above calculations, and circles 201 and 205 indicate the deviation. Detection, circles 202, 203,
204 indicates addition.

The switching of the upper and lower air outlets by the air outlet switching damper 21 is as follows:
It is automatically determined according to the opening degree of the temperature control damper 18, that is, the temperature of the blown air.

However, as described above, the temperature of the blown air differs even when the damper opening degree is the same when the compressor is on and off, so in order to correct this, a correction value Ms is obtained by the correction process 215 and used for switching the air outlet.

The temperature control and operation mode control illustrated in FIG. 1 are executed in accordance with a control program stored in the ROM of the microcomputer 100.

An outline of the control program is shown in FIG. When the ignition key switch 4 is closed, the control device 1 is activated, and when power is supplied to the microcomputer 100, the control program starts executing from the start stitch 300.

Initialization is then performed by the startup circuit 180, and an initialization routine 400 sets conditions that serve as the basis for program execution.

The initial setting routine 400 includes, for example, resetting a timer function, which will be described later, or first setting the correction term CF in the temperature control calculation formula to O.

The control program then runs an initial temperature reading routine 500.
, analog signal reading and related processing routine 600, operation mode determination and related processing routine 700, temperature calculation and temperature adjustment damper drive routine 800 based on it, convergence correction processing routine 900, and then return to routine 500 or routine 600, and thereafter. Repeat this.

The time interval of this repeated processing (routines 600 to 8)
00 processing interval) is approximately several tens of milliseconds.

Details of the initial temperature reading routine 500 and the analog signal reading and related processing routine 6-00 in FIG. 8 are shown in FIG.

Further, the operation mode determination and related processing routine 700 are shown in FIGS. 10 to 13, the temperature calculation and the temperature adjustment damper driving routine 800 based on it are shown in FIG. show.

The numbers A, B, C, D, and E indicating the start, end, and branch ends of each routine in FIGS. 9 to 16 are made to match the same numbers in FIG. 8.

The initial temperature reading routine 500 and the analog signal reading and related processing routine 600 will be explained with reference to FIG.

First, in step 501, the microcomputer 1
Starts one of the timer functions (timer 1) built into 00.

Regarding the timer function that uses the timer/counter built into the microcomputer 100, refer to the above-mentioned MB884.
As explained in the 0 series user manual, in this example, timer 1 is used as a 2-minute timer by counting the number of overflows of that timer/counter using software (using a predetermined location in RAM as the counter). I am doing it.

Timer 2, which will be described later, similarly constitutes a 10-minute timer.

Next, at step 502, the initial inside air temperature Tr (Ol) is read.

At this time, as described above with reference to FIG. It is read as a digital quantity.

Note that software processing may be performed in the microcomputer 100 to create an appropriate correspondence between the output signal of the internal temperature sensor 60 and the digital quantity read from the A-D exchange circuit 130. .

Then, the obtained value indicating the inside air temperature Tr is stored in the RAM as the initial inside air temperature Tr(0).

Next, in steps 601, 602, 603, and 604, the inside air temperature Tr, outside air temperature Tam, and set temperature T are set, respectively.
2. The opening degree Tpo of the temperature control damper is read, and the associated arithmetic processing is executed.

Gain multiplication is also performed for each term in order to execute the temperature calculation equation.

When the inside air temperature Tr is read, the inside air temperature term Kr, which is multiplied by a predetermined gain Kr used for temperature calculation, is used together with the digital quantity Tr as a correction term when the compressor is off for temperature calculation.

A term M1 multiplied by a predetermined gain α and a predetermined gain β used in a correction calculation for selecting the upper and lower air outlets
The term Ms 1 is calculated by multiplying by , and is stored in a predetermined location in the RAM.

When the outside air temperature Tam is read, the outside air temperature term Kam, which is multiplied by a predetermined gain Kam used for temperature calculation, as well as the digital quantity Tam, and a predetermined gain used as a correction term when the compressor is turned off for temperature calculation. A term Mx multiplied by α and a term Mxl multiplied by a predetermined gain ε used in a correction calculation for selecting the upper and lower air outlets are calculated and stored in the RAM.

When the set temperature T2 is read, the digital quantity T2 is directly stored in the RAM as a term K2 used for temperature calculations and other purposes.

When the damper opening degree Tpo is read, the digital quantity Tpo expressed as a percentage is multiplied by a constant gain Kpo used for temperature calculation and stored in the RAM as a value Kpo.

Next, the inside air temperature display processing routine 605 is executed.
Since the temperature display itself has little to do with the gist of the present invention, its explanation will be omitted.

C indicates a branch input terminal, and initial temperature reading step 501
, 502 is not used, that is, when the starting temperature Tr(01 is valid storage period of at least 2
The program is repeatedly executed through this branch input terminal C until the minute has elapsed.

An outline of the operation mode determination and related processing routine 100 will be explained with reference to FIGS. 10 to 13.

In the two determination steps 701 and 702, the air conditioner switch 65 and the economy switch 6 on the operation panel 2
Pin K of the input port of microcomputer 100 determines whether pin 7 is open (off) or closed (on).

, K2.

Then, in determination step 701, if the air conditioner switch is off, that is, if the compressor is off, an operating mode in which the cooler 15 is not used is specified,
Processing is executed according to line a.

(Note that the judgment step indicated by a diamond indicates the flow in the horizontal direction.
Yes J (YES), downward flow "No J (NO)"
).

Since the operating mode is the compressor off, first, in an output step 703, a command signal to turn the compressor off is output.

Referring to Figure 2, the micro is connected to the computer 1.
00 outputs a 1-level signal to pin R8 of the input/output ports with a latch, and outputs this to the on/off signal amplification circuit 152.
The signal is amplified and output to the electromagnetic clutch 50 as a deenergization signal.

If the electromagnetic clutch 50 was in the energized state before, it is switched to the deenergized state, and if it was in the deenergized state, it remains as it is.

Next, the microcomputer 100 executes the routine 70
4, the signal level of pin K1 of the input ports is checked, and it is determined whether the suction port changeover switch 64 is open (off) indicating an internal air type or closed (on) indicating an outside air type.
In addition, the signal level of pin K3 of the input ports is checked to determine whether the short air internal switch 64 is open (off) or closed (on), and a solenoid valve is operated to drive the internal/external air switching damper 13 according to the determination. Specify energization or deenergization of 52.

Then, the correction term MF in the above-mentioned temperature calculation formula is determined depending on whether it is an internal air type (including a short internal air type) or an outside air type.

In other words, if it is an internal air type, M1 (= aTr)
, if it is an outside air type, select Nx (=rTam).

Next, in order to switch between the upper and lower sides of the air outlet, it is calculated whether the opening degree of the temperature change control damper 18 at that time corresponds to the degree of opening of the blown air, and according to the calculated value, the blown air is set to a reference temperature of, for example, 30°C. If it is above ℃, the lower outlet is 20. If it is below 30℃, the upper outlet is 19. Input/output a signal specifying energization or deenergization of the solenoid valve 57 to drive the outlet switching damper 21. Output from pin R7 of the port.

When the pin R7 is at the 1 level, the solenoid valve 57 is deenergized and the inside/outside air switching damper 21 opens the lower outlet 20. When the pin R7 is at the O level, the solenoid valve 57 is energized and the inside/outside air switching damper 21 is opened at the upper side. Opening the blowout I:19 is as described above.

FIG. 11 specifically shows the control program for the combustor after line a and when it is off.

In the inside/outside air determination step 705, when the suction port changeover switch 66 is closed, it is determined that the "inside air type" is selected, and the process proceeds to step 7.
At 06, the solenoid valve 5 is activated to set the inside/outside air switching damper 13 to the inside air side.
2 (produces an O level signal at pin R of the input/output port of the microcomputer 100).

Next, a term Mi related to the inside air temperature Tr is read out from the RAM and set as a correction term MF for temperature calculation.

In other words, since the compressor is off and an internal air type, the temperature of the air sent from upstream of the temperature control damper 18 is not 0°C (the temperature of the air after passing through the cooler 15 when the compressor is on), but the internal air temperature Tr. Therefore, depending on the inside air temperature Tr, if the inside air temperature Tr is 0° C. or higher, the temperature control damper 18 is moved closer to the cooling side (the proportion of air passing through the bypass passage 17 rather than passing through the heater 16 is increased).

), and the correction term MP is determined so that if the inside air temperature Tr is below 0° C., the heating side is driven more.

As mentioned above, M1 is calculated by multiplying the inside air temperature Tr by the gain constant α, but the gain constant α is the data obtained as a result of investigating the relationship between the inside air temperature Tr, the damper opening degree, and the temperature of the blown air at that time. Determined by.

Note that when the compressor is on, such correction is not necessary, so the correction term MF is set to O.

Steps 708, 708, and 710 perform arithmetic processing to determine the upper and lower positions of the air outlet.

When the compressor is on, if the damper opening is 60%, for example, and the temperature of the blown air is 30℃, then if the damper opening is higher or lower than 60, and you switch the air outlet up or down, you will get a cold head, a cold foot, and a cold foot. However, when the compressor is off, simply switching the outlet depending on the damper opening makes it impossible to switch the outlet depending on the temperature of the blowing air, for example 30°C. The relationship between the damper opening degree and the blown air must be corrected depending on the temperature.

In step 708, the correction term MS is the inside air temperature T.
Select Msi, which is r multiplied by gain constant β.

Then, in step 709, the damper opening degree S indicating the switching point of the air outlet is corrected.

Here, D is a value indicating the damper opening degree, for example, 60%, which provides a standard blowout nitrogen temperature, for example, 30° C., which is the boundary for switching the outlet when the compressor is turned on.

Next, in step 710, it is determined whether the actual damper opening UKpo is larger than the damper opening degree S, which is the switching point of the air outlet, and if "yes", hot air is blown mainly to the lower body of the occupant in step 711. In order to do so, a de-energizing command is output to the solenoid valve 57 to cause the switching damper 21 to open the lower air outlet 20.

When the actual damper opening degree Kpo is smaller than the boundary line S in step 110, in step 712, the energizing command of the solenoid valve 57 is outputted to blow cold air mainly to the upper body of the occupant, and the switching damper 21 Open the air outlet 19.

If the determination is "No" in the inside/outside air determination step 705, then in the short-term inside air determination step 113, it is determined whether the short-time inside air switch 68 is on.

If ``No'' means that the outside air type is used, the process moves to step 71γ, but if ``Yes'', the internal air type is used for a certain period of time, for example, 10 minutes by timer steps 714, γ15, and γ16, and after 10 minutes, the outside air type is used. Switch to formula.

As mentioned above, the short-time internal air switch 68 is a self-resetting type, so when it is temporarily opened, the process moves from judgment step 713 to step 714 and moves to step 715, where it starts timer 2 as a built-in timer mechanism. , from step 706, the internal air type processing described above is executed.

Then, in step 115, the timer 2 is started, and at the same time, a numerical value indicating that the internal air switch 68 has been closed for a short time is stored in a predetermined location in the RAM, and judgment step 7
In step 13, this is determined.

Then, in timer determination step 716, when it is determined that 10 minutes have elapsed, the numerical value stored in the RAM is erased.

In the case of the outside air type, first, in step 717, a deenergization indicator ♦ signal of the solenoid valve 52 is outputted to open the inside/outside air switching damper 13 to the outside air introduction port 12.

Next, the correction term MF for temperature calculation is changed to the outside air temperature Tam
Mx is determined by multiplying by the gain constant γ.

Next, in steps 719, 720, and 721, the damper opening degree S, which determines the upper and lower positions of the outlet, is corrected by the value Msx obtained by multiplying the outside air temperature T am O by a constant gain constant ξ, as in the case of the internal air type, and this and the actual The upper and lower positions of the air outlet are determined by comparing with the damper opening degree Kpo.

In step 722723, in accordance with the determination, the magnetic valve 57 for driving the outlet switching damper 21 is commanded to be deenergized or energized.

Returning to Figure 10, air conditioner switch determination step 7
If 01 is "No" (air conditioner switch is on), the next judgment step 702 is to turn on the economy switch 67.
is determined to be on or off.

If the economy switch is off (“no”), processing is executed according to line b so that the air conditioner is operated in the normal operation mode with the compressor on.

First, in step 724, a command to turn on the compressor, that is, a signal to energize the electromagnetic clutch 52 to operate the cooling cycle is output.

Next, in routine 725, a determination is made as to whether the type is an internal air type, an external air type, or a short-time internal air type, and the internal/external air switching damper 18 is controlled according to the determination, and the air outlet is controlled according to the opening degree of the temperature control damper. Execute the switch.

Details of the routine 725 will be explained with reference to FIG.

When the cooling cycle is operated in step 724, the correction term MF for temperature calculation is set to O in step 726, and the on/off status of the suction port changeover switch 66 and short internal air switch 68 is checked in step 727 and 728, and the internal air type is specified. If so, the process advances to step 729 to output the energizing finger signal for the solenoid valve 52 and drive the inside/outside air switching damper 13 to the inside air introduction side. The deactivation finger ◆ signal is output to drive the inside/outside air switching damper 13 to the outside air introduction side.

Further, if the short-time internal air type is specified, the timer processing steps 731, 732, and 733 cause the internal air type to be used for 10 minutes and then switch to the outside air type.

Next, processing steps 734 and 73 switch the air outlet up and down.
5,736,737, but since the cooling cycle is being operated, the temperature of the air that has passed through the cooler 15 is almost unrelated to the temperature of the intake air and is constant at approximately 0°C, so the temperature control damper is The temperature of the blown air can be determined by the opening degree Kpo of 18 degrees, and therefore the damper opening degree D (generally about 60%) corresponding to the blown air temperature of 30°C is set as the damper opening degree S indicating the cut pipe point of the outlet. , this is compared with the actual opening degree to determine the upper or lower position of the air outlet, and the energization or deenergization of the solenoid valve 52 is controlled.

Returning to FIG. 10, in the air conditioner switch determination step 701, "No" (air conditioner switch on)
and the next economy switch determination step 702
If it is determined to be "yes" (economy switch 67 is on), the process proceeds to line C and the air conditioner is controlled in the economy operation mode.

First, combrezzar on/off condition determination routine 73
8, it is determined whether the internal air type or the external air type is specified, and the internal/external air switching gunpa 13 is driven accordingly, and if the short-term internal air type is specified, the short-term internal air processing routine 739 is executed. Execute.

When the inside air type or the outside air type is specified, it is determined whether it is necessary to cool down, that is, to obtain a large cooling effect by sudden cooling start-up, by comparing the target set temperature T2 and the inside air temperature Tr. When cool down is required, operate the air conditioner in normal mode with the compressor turned on according to line b until cool down is no longer necessary.

After the cool-down process, it is determined whether the target set temperature T2 can be obtained without operating the cooling cycle by comparing the set temperature T2 and the outside temperature Tam, and if the set temperature T2 cannot be obtained as a result of the determination, , the set temperature T according to line b
The air conditioner is operated in the normal mode with the compressor turned on until it is determined that 2 is obtained.

If it is determined that the target set temperature T2 can be obtained without operating the air conditioner, a compressor-off control routine 740 is executed.

In this control routine 740, the operation of the cooling cycle is stopped and at the same time, the intake port is switched to the outside air type and the air conditioner is operated.

The economy operation mode will be explained in detail with reference to FIG. 13.

First, in suction port determination steps 741 and 742, it is determined whether the internal air type, the external air type, or the short-time internal air type is designated.

In the case of the inside air type, the inside/outside air switching damper 13 is set to introduce inside air in step 743, and in the case of the outside air type, the inside/outside air switching damper 13 is set to introduce outside air in step 744.
In the case of short-time internal air type, timer processing steps 745, 7
46,746a for 10 minutes, and 10
After a few minutes have passed, the outside air system will be used.

Short-term internal air processing steps 147, 748 749
750, 751, 752, and 753 are almost the same as the control when the compressor is turned on as explained in FIG.

If it is not a short-time internal air type but an internal air type or an external air type, drive command signal stamps 743, 74 for the suction port switching damper 13
After outputting in step 4, a cool-down necessity determination routine consisting of steps 754, 755, and 756 is executed.

In step 754, the temperature difference P between the set temperature T2 and the inside air temperature Tr is calculated, and if this temperature difference P is smaller than the predetermined temperature difference B1, for example, 1.6°C, it is determined in step 755 that cool-down is not required ("Yes"). Also, if the temperature difference P is smaller than the temperature difference B+b, for example, 2.6°C, step 756
It is determined that cool-down is not necessary (“No”), and the temperature difference P
For example, when the temperature is higher than 2.6° C., it is determined that a cool-down is necessary, and control proceeds from step 756 to the normal operation mode when the compressor is turned on, as shown in FIG. 12, via the branch end b.

The reason why the temperature change difference b is set to determine the temperature difference P in determination steps 755 and 756 is to prevent the compressor from turning on and off repeatedly by providing hysteresis in the determination level. It is.

If it is determined that cool-down is not necessary, a capability determination process is performed in steps 757, 758, 759, and 76 to determine whether the target set temperature T2 can be obtained without operating the cooling cycle.
Executed at 0.

This capability determination process is to determine whether the temperature of the introduced air is sufficiently low relative to the set temperature T2.

When this air conditioner is used for cooling, in principle, in order to stably match the inside air temperature Tr to the target set temperature without operating the cooling cycle, outside air must be introduced and the outside air temperature Tam must be the set air temperature. T2 must be sufficiently low.

In this embodiment, when the temperature difference R between the installed air temperature T2 and the outside air temperature Tam is calculated in step 751, the temperature difference R is, for example, 7° C. or more when the cooling cycle is stopped (compressor is off), and when the cooling cycle is not operating. When the temperature is lower than 7°C, for example, 10°C or higher, it is determined that the cooling cycle may be stopped (capable).

When the temperature difference R is smaller than the above value, it is determined that there is no capacity, and the compressor shown in FIG. 12 is controlled in the normal mode when turned on according to line b.

The cooling cycle is stopped and the target set temperature is obtained.
If it is determined that this is the case, in step 761, a de-energizing signal ◆ of the solenoid valve 50 is output to stop the cooling cycle, and in step 762, a de-energizing finger ◆ signal of the solenoid valve 52 is output to reduce the internal and external air. The switching damper 13 is switched to introducing outside air.

Further, a correction term MF for temperature calculation is determined to be a value Mx related to the outside air temperature Tam.

Next, in steps 765, 766, 767, and 768, processing is performed to determine the upper and lower positions of the air outlet.

The processing from step 163 to step 76B is the same as from step 118 to step 123 in FIG. 11, which was explained as the control when the compressor is turned off.

Next, a temperature calculation for driving the temperature adjustment damper 18 and a damper driving routine based on the temperature calculation will be explained with reference to FIG.

In steps 801 and 802, first the temperature calculation formula (1) is used.
, (2) is calculated.

Among the terms necessary for this calculation, K2 + K r + Ka
m and Kpo are stored in RAM by analog signal reading and related processing routines (see Figure 9).
MF is determined by the operation mode discrimination and its related processing routine (see Figures 10 to 13), and CF is set to 0 in the initial setting routine, step 80.
1, 802 simply reads these values from RAM and calculates them.

△Kpo obtained as a result of calculation is calculated from various operating conditions of the particular feature of the air conditioner, and is calculated based on the temperature K1 of the object to be controlled and the target set temperature set by the temperature setting device 63. The deviation from K2 (two T2) is shown.

Next judgment step 803, 804, 805, 80
6, 807, 808, it is determined whether the deviation △Kpo is "almost 0", larger than that, or smaller, and if the deviation △Kpo is almost 0, step 80
9, solenoid valve 54. 55 to stop the temperature control damper 18, and when the deviation △Kpo is larger than "almost O", the temperature K1 to be controlled is "low" in order to bring the inside air temperature Tr to the set temperature T2. 1,) J, that is, the temperature of the blown air is determined to be low, and in step 811, the solenoid valve 5 is
5 to drive the damper 18 in the direction of increasing its opening degree, and when the deviation △Kpo is smaller than "almost 0", the inside air temperature Tr is controlled to be the set temperature T2. It is determined that the temperature K1 is high, that is, the temperature of the blown air is high, and in step 810, the solenoid valve 55 is energized to drive the damper 1B in a direction that reduces the opening degree of the damper 18.

Here, determination steps 803 to 808 are performed on the solenoid valves 54 .
In order to prevent the energization and de-energization of the solenoid valve 55 from switching violently in a short period of time, hysteresis is added by giving a predetermined range to the judgment level of the deviation △Kpo, and the solenoid valve 54 and the solenoid valve 55 are It is arranged so that the energization of the energizing elements does not change at once.

Judgment steps 803 and 804 are performed by the solenoid valve 54,
55 is energized (on) or deenergized (off).

If either is energized, step 805;
At step 806, it is determined whether to maintain the energization or switch to de-energization based on the magnitude of the deviation ΔKpo.

If neither of the electromagnetic valves 54 and 55 is energized, it is determined in steps 805 and 806 whether to maintain the deenergized state or to energize one of them.

Determination step 803 To illustrate the function of 80B, the first
It will look like Figure 5.

In FIG. 15, a solid line 55a shows the relationship between the energization and deactivation of the solenoid valve 55 and the deviation ΔKpo, and a solid line 54a shows the relationship between the energization and deactivation of the solenoid valve 55 and the deviation ΔKpo.
4 shows the relationship between energization and deenergization and deviation ΔKpo.

Then, when the solenoid valve 55 involved in temperature rise switches from deenergized to energized, the process proceeds from the 1° C. determination step 807 to the switching step 811, and conversely, when it switches from energized to deenergized, the process proceeds to 0.6° C. From the determination step 806 to the switching step 80
Proceed to 9.

Further, when the solenoid valve 54 involved in temperature reduction is switched from energized to de-energized, the process proceeds from the -0.4°C judgment step 810 to the switching step 810, and conversely, when it is switched from energized to de-energized, it is 0°C. From the determination step 805 to the switching step 809
Proceed to.

When the deviation ΔKpo is "approximately 0" between 0° C. and 0.6° C., both of the solenoid valves 54 and 55 are deenergized.

If either of the solenoid valves 54 or 55 is energized, the temperature control damper 18 is in operation, which means that the temperature control is not yet stable. Processing routine 600 (see Figure 9)
Return to

branch end C until both solenoid valves 54 and 55 are deenergized.
Repeat the process through .

Solenoid valve 54. 55 are de-energized, the process moves to timer determination step 812.

Timer determination step 812 is initial temperature reading routine 750
It is determined whether two minutes have elapsed since the timer 1 was started at 0 (see FIG. 9).

Then, while two minutes have not elapsed, the process returns to the analog signal reading and related processing routine 600 through the branch terminal C.

That is, once the initial temperature reading routine 500 is passed, the analog signal reading and related processing routine 600 and the operation mode determination and related processing routine are executed for at least two minutes and until both the solenoid valves 54 and 55 are energized. 70
0, and the temperature calculation and temperature adjustment damper driving routine 800 based thereon are repeatedly executed.

In addition, in a general air conditioner, the opening degree of the temperature control damper 18 is stabilized in 2 minutes unless there is a large change in the outside air temperature T1.

If both of the solenoid valves 54 and 55 are deenergized and two minutes have elapsed since the initial internal air temperature T r (0) was read, the process proceeds from determination step 812 to the convergence correction processing routine shown in FIG. Move.

In the convergence correction processing routine, as a result of the temperature calculation and the processing of the temperature adjustment damper drive routine 800 based on the temperature calculation,
When the temperature control damper 18 stops and the temperature of the blown air becomes stable, the internal air temperature Tr (read in the analog signal reading and related processing routine 600) in that state is read out from the RAM and used in steps 901, 902, and 903.

) is compared with the initial temperature Tr (01) at the time of starting the timer 1, and it is determined whether the inside air temperature Tr has stabilized within approximately 2 minutes.

When the temperature is stable and the temperature is high, the process returns to terminal A and starts the process again from the initial temperature reading routine 500.

When the internal air temperature Tr remains approximately the same for 2 minutes, it is considered that the temperature control based on the calculation formulas (1) and (2) is stable.

Next steps 904, 905, 906, 907
, 908 compares the internal air temperature Tr at that time with the target set temperature T2, and if there is a difference, corrects the temperature calculation formula (1), (2J) and starts the program from terminal A. Return to

In internal air temperature Tr stability determination steps 901 to 903,
First, in step 901, a temperature difference △Tr between the internal air temperature Tr at that time and the initial internal air temperature Tr (01) is calculated, and in judgment steps 902 and 903, the difference △Tr is determined to be, for example, O±
Determine whether the temperature is 1°C.

When the temperature difference ΔTr for 2 minutes is within 0±1° C., it is considered that the temperature control using the temperature calculation formula is stable.

Then, in step 904, the temperature difference Y between the target set temperature T2 and the indoor temperature Tr is calculated, and in determination steps 905 and 906, the temperature difference Y is, for example, 0±1°C.
Determine whether or not it exists.

When the temperature difference is +1° C. or more, the correction term CF (initial setting is 0) in the temperature calculation formula is set to a smaller value by cf in order to correct the temperature adjustment damper 18 to a position further on the heating side.

Also, when the temperature difference Y is -1°C or more, the temperature control damper 18
In order to further correct the position to the cooling side, the correction term CF is changed to c
Increase the value by f.

The value of cf may be approximately a value corresponding to a change in air temperature of, for example, 0.8°C.

When the correction term CF is newly calculated in steps 907 and 908, the process returns to the beginning of the program (initial temperature reading routine) from terminal A, and when the damper opening is stabilized after at least 2 minutes, it is determined that the internal air temperature Tr is stable. Step 901~
Step 903 is executed, and the temperature difference Y is again compared with the set temperature T2 in step 904. If the temperature difference Y is still not within O±1° C., the value of the correction term CF is further increased or decreased by cf.

When the temperature difference Y is within 0±IC, this indicates that the internal air temperature Tr has almost converged to the target set temperature T2, and the program returns from the sparse child A to the beginning of the program, leaving the correction term CF unchanged. While the main switch 64 is closed, each functional element of the air conditioner is repeatedly controlled according to the program described above.

Even if the operating mode, temperature control set temperature, outside temperature, etc. change while the air conditioner is operating, the program repeats every few tens of milliseconds, so it will follow the changes with almost no delay. .

In this embodiment, the convergence correction processing routine is executed approximately every two minutes, but this interval may be set to several tens of seconds to several minutes.

In addition, the judgment range for the temperature difference Y between the inside air temperature Tr and the set temperature T2 is narrowed to 0±1°C, and the increase/decrease value cf of the correction term CF is
By making the temperature smaller than 0.8° C. (the temperature of the blown air), the accuracy of temperature control convergence can be improved.

Further, the interval at which the convergence correction processing routine is executed may not be fixed to, for example, two minutes, but may be changed during the control.

For example, it takes extra time for the inside air temperature Tr to stabilize for a while after the air conditioner starts operating. The execution interval of the correction processing routine may be changed on the pirogram depending on the elapsed time from the start of operation or the temperature difference between the set temperature T2 and the inside air temperature Tr.

In addition, as a method for determining whether or not the inside air temperature T1 has stabilized, as described above, the temperature adjustment damper 18 is stopped and the temperature difference between the initial inside air temperature Tr (01 and the inside air temperature Tr after 2 minutes) is determined. In addition to determining whether or not the temperature adjustment damper 18 is continuously in a stopped state for a predetermined period of time, a method may also be used.

Even if the increase/decrease value cf of the convergence correction term CF is not constant,
It may be changed depending on the magnitude of the temperature difference between the inside air temperature Tr and the set temperature T2.

As described above, in the present invention, the blowing direction of the blown air is changed depending on the comparison between the adjusted temperature and the reference temperature, and the direction of the blowing air is changed depending on the temperature of the air inside or outside the car introduced into the air conditioning function section. Since the relative difference between the control temperature and the reference temperature for comparison is corrected, even when changing the heat exchange capacity in the air conditioning function part, the selection of the outlet and the outlet air temperature can be matched, resulting in comfortable air. It has an excellent effect of achieving harmony.

Furthermore, there is an excellent effect that temperature control and air blowing change control can be performed using a common control condition generating means.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the device to which the present invention is applied. Fig. 1 is a block diagram of the overall system, Fig. 2 is an electrical connection diagram of the electrical control system, and Figs. 5 and 6 are detailed electrical wiring diagrams of the on/off signal amplification circuit 150 shown in FIG. 2, and FIG. 7 is a schematic diagram of temperature control. FIG. 8 is a flowchart showing an outline of the control program executed by the microcomputer 100 shown in FIG. 2, FIGS. 9 to 14, and FIG. 16 are flowcharts showing details of each part of the control program shown in FIG. 9 shows the initial temperature reading routine 500, analog signal reading and related processing routine 600, FIG. 10 shows the operation mode determination and related processing routine 700, and FIG. 11 shows the air conditioner switch in FIG. The subsequent processing routine, FIG. 12 shows the processing routine following the air conditioner switch in FIG. 11 when it is off and the economy switch is turned off, and FIG. 13 shows the processing routine following the economy switch and ON shown in FIG. 11.
The figure shows a temperature calculation and a damper drive routine 800 based on it.
16 shows a convergence correction processing routine 900, and FIG. 15 shows a hysteresis characteristic diagram in damper drive to explain the routine of FIG. 14 in the control program.
FIG. 17 is a functional block diagram showing the structural features of the control device of the present invention. 1...control device, 2...operation panel,
10... Ventilation duct, 11... Vehicle interior air inlet, 12... Vehicle exterior air inlet, 1
4...Blower motor, 15...Cooler, 16...Heater, 18...Damper for temperature adjustment, 19...Top Air outlet, 20...
...Lower outlet, 21... Damper for switching the outlet, 50... Electromagnetic clutch, 60...
...Inside air temperature sensor for detecting vehicle interior temperature, 6
1...Outside air temperature sensor for detecting the outside temperature of the vehicle, 62...Damper opening sensor, 63...
...Temperature setting device, 64...Main switch, 6
5...Air conditioner switch.

Claims (1)

[Scope of Claims] 1. A vehicle that determines the temperature of blown air blown out of the vehicle from an air conditioning function section according to control conditions including a temperature inside the vehicle and a temperature outside the vehicle, and adjusts the blown air according to the determined temperature. In the air conditioning control method for a car, the blowing direction of the blown air is changed according to a comparison between the determined temperature and a reference temperature, and the blowing direction of the blown air is changed depending on the comparison between the determined temperature and the reference temperature. An air conditioning control method for a vehicle, characterized in that a relative difference between the temperature of the blown air and a reference temperature related to the comparison is corrected in accordance with the temperature of the air. 2. The vehicle air conditioning control method according to claim 1, wherein the temperature of the blown air is indicated by the adjustment position of a temperature adjustment member included in the air conditioning function section. 3. A ventilation duct for sending air toward the vehicle interior, a blower motor that generates an air flow toward the vehicle interior in the ventilation duct, a selection means for selecting air intake into the ventilation duct from inside the vehicle interior or outside the vehicle interior; a heat exchange means disposed in the ventilation duct, which includes a heater and a cooler, exchanges heat with the air flow and is capable of adjusting the amount of heat exchange; In a vehicle air conditioning control device comprising a direction change means for changing the blowing direction of air, the air conditioning control device includes: an inside temperature detection means for generating a first signal according to the actual temperature inside the vehicle; a second signal according to the temperature outside the vehicle interior; an outside temperature detection means that generates a signal; a setting means that generates a third signal according to the target set temperature inside the vehicle; and an adjustment amount detection means that generates a fourth signal according to the adjustment amount of the heat exchange means. , a digital control means including the following first to seventh means: (a) a first means for determining whether the selection state of the selection means is an inside air intake state or an outside air intake state; (b) ) a second means for determining whether the rotating state of the cooler is in an operating state or in a stopped state; (d) third means for producing a first control output signal indicative of the amount of heat exchanged in the air stream when the cooler is found to be activated by the second means; fourth means for generating a constant first reference signal indicative of the blowing direction; (e) when the second means determines that the cooler is in a stopped state, the first means activates the selection manual; fifth means for generating a second reference signal corrected by the first signal O indicating the blowing direction of the air flow when it is determined that the air flow is in the inside air intake state; indicating the blowing direction of the air flow when the second means determines that the cooler is in a stopped state and the first means determines that the selection means is in an outside air intake state; , sixth means for producing a third reference signal corrected by the second signal; (g) the first, second or third signal obtained by the fourth, fifth or sixth means; seventh means for generating a second control output signal indicative of a change in the blowing direction in the direction change means based on the reference signal and the fourth signal; a first controller for adjusting the amount of heat exchanged in the heat exchanger in response to a control output signal of the first controller;
and a second electric drive means for determining the direction change of the direction change means in response to a second control output signal from the digital control means. Air conditioning control equipment. 4. The heat exchange means includes a temperature regulating damper that changes the distribution of the air flow through the heater, and the adjustment amount detection means directly generates a signal indicating the opening degree of the damper. The vehicle air conditioning control device according to claim 3, characterized in that: