JPH0580366B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner for a vehicle, and more specifically, an air conditioner for a vehicle that can control an air intake port between an inside air circulation state, an outside air intake state, and an intermediate state therebetween. Regarding air conditioners.

(Prior Art) In a vehicle air conditioner, Japanese Patent Application Laid-Open No. 55-94809 discloses that when the deviation between the cabin temperature and the set temperature is out of a predetermined range, the intake door is controlled to be in an internal air circulation state. ing.

However, with such intake door control, it is insufficient to judge the heat load inside the passenger compartment. For example, if the heat load is high and the fan is manually operated at maximum rotation, and the room temperature drops, the deviation between the set temperature and the passenger compartment temperature may occur. falls within a predetermined range, and the state changes from the inside air circulation state to the outside air introduction or intermediate (for example, 1/3 outside air introduction) state. In this case, when the outside air temperature is high, the inside air circulation state is immediately returned to, and this operation is repeated, resulting in the problem of hunting of the intake door.

In addition, in order to solve this problem, for example,
As shown in Japanese Patent No. 60-12331, there is a system that controls the intake door according to the opening degree of the mixer door and the rotational speed of the blower.

However, in the case of the intake door control disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 12331/1983, when the blower rotation speed is manually reduced to a low rotation speed, it is determined that the heat load on the evaporator has decreased, and the intake door is always closed. The door enters outside air or enters an intermediate state,
There was a problem in that the intake port was controlled against the occupant's will, which sometimes did not match the occupant's senses.

(Object of the Invention) The present invention has been made in view of the above, and is intended for use in a vehicle, which allows appropriate control of the blower rotation speed even when the blower rotation speed is automatically controlled, and which operates in accordance with the sense of use of the passenger when the blower rotation speed is manually controlled. The purpose is to provide air conditioning equipment.

(Configuration of the Invention) FIG. 1 is a block diagram showing the configuration of the present invention.

The vehicle air conditioner of the present invention transfers intake air taken in through an intake door 1 to a heat exchanger 2 whose heat exchange amount is controlled by a signal related to the deviation between the vehicle interior air temperature and a set temperature. The air blower 3 blows air and the heat exchanged air is blown into the vehicle compartment by the heat exchanger 2, thereby controlling the temperature in the vehicle interior to a desired temperature.

The intake door 1 is fully closed to the inside of the vehicle to introduce all outside air, fully closed to the outside of the vehicle to introduce inside air, that is, to circulate the inside air, or set to an intermediate position to allow some outside air to be mixed with the inside air and outside air. It is constructed so that a mixed state can be obtained.

The blower 3 has an output from an automatic/manual control switching means 6 which selects either the output of a control means 4 which outputs a control signal related to the deviation between the vehicle interior air temperature and the set temperature, or the output of a manual setting means 5. is supplied as the airflow control signal. The selection means 7 selects the larger output between the output of the control means 4 and the output of the manual setting means 5. Automatic/manual control switching means 6
The switching means 8, which is switched in conjunction with the instruction, selects either the output of the control means 4 or the output of the selection means 7, and selects the output of the intake door position control means 9.
According to the output of the switching means 8, the intake door 1 is controlled to be in an inside air circulation state or a partial outside air introduction state.

(Operation of the Invention) When the automatic control state is selected in the automatic/manual control switching means 6, the output of the control means 4 is supplied to the blower 3, and the air flow rate of the blower is controlled by the output of the control means 4. That is, the amount of air blown by the blower is automatically controlled to an amount corresponding to a control signal related to the deviation between the vehicle interior air temperature and the set temperature. At this time, the output of the control means 4 is selected by the switching means 8, and the output of the control means 4 is selected by the switching means 8, and the output of the control means 4 is selected by the switching means 8.
The position of the intake door 1 is controlled via.

When the manual control state is selected in the automatic/manual control switching means 6, the output of the manual setting means 5 is supplied to the blower 3, and the blower air volume corresponds to the manual setting value set by the manual setting means 5. manually controlled. At this time, the output of the selection means 7 is selected by the switching means 8. However, the selection means 7 selects and outputs the larger of the output of the control means 4 and the output of the manual setting device 5. Therefore, the position of the intake door 1 is controlled by the output of the manual setting means 5 or the output of the control means 4, whichever is greater.

However, when the amount of air blown by the blower is large, the thermal load is high, and when the amount of air blown is small, the thermal load is low. Controlling the position of the intake door 1 based on the amount of air blown by the blower means that the position of the intake door 1 is controlled depending on the heat load state due to the amount of air blown by the blower. In the present invention, in addition to the above, when the airflow rate is manually controlled, the intake door position is partially set to outside air based on the larger airflow rate between the airflow rate under manual control and the airflow rate under automatic control at that time. It will be controlled to the introduction state or the internal air circulation state.

(Example of the invention) The present invention will be explained below with reference to Examples.

FIG. 2 is a block diagram showing the configuration of one embodiment of the present invention.

11 is an air conditioner main body, and 12 is a control device consisting of a microcomputer that controls the air conditioner main body 11.

The air conditioner main body 11 has an intake door 14, a blower 15, an evaporator 16, a mixer door 17, and a heater core 18 arranged in this order from the upstream side of the duct 13, and an air outlet 31 to the vehicle interior 34 on the most downstream side. 32 and a mode switching door 19 for selecting the air outlets 31 and 32.

The intake door 14 is the motor actuator 21
, and is driven to select one of a full outside air introduction position, a vehicle interior air introduction position, or a partial outside air introduction position. When the partial outside air introduction position is selected, outside air and vehicle interior air are mixed and sucked.
Air taken in by the blower 15 through the intake door 14 passes through the evaporator 16 and is cooled when the cooler 26 including the evaporator 16 is in operation.

22 is a compressor, 23 is a capacitor, 24
25 is a receiver tank, and 25 is an expansion valve, which together with the evaporator 16 constitutes a cooler 26. The rotation of the output shaft of the vehicle internal combustion engine is transmitted to the pulley 27 . The rotation of pulley 27 is transmitted to compressor 22 via magnetic clutch 28, and compressor 22 is driven by this transmission.

The heater core 18 is supplied with cooling water for the internal combustion engine mounted on the vehicle and functions as a heater. The mix door 17 is driven by a motor actuator 30, and the amount of air passing through the heater core 18 in the amount of air passing through the evaporator 16 is controlled by the opening degree of the mix door 17.

On the other hand, as will be described later, the amount of air blown by the blower 15, the operating timing and period of the cooler 26, and the opening degree of the mixer door 17 correspond to values related to the deviation between the interior air temperature and the set temperature based on the output from the control device 12, as described later. The temperature inside the vehicle is controlled to a desired temperature by controlling each of them separately.

The air outlet 31 forms an upper outlet, and the air outlet 32 forms a lower outlet.
You can choose one or both. A state in which the air outlet 31 is selected is referred to as a vent mode, a state in which the air outlet 32 is selected is referred to as a heat mode, and a state in which both air outlets 31 and 32 are selected is referred to as a bilevel mode. The mode switching door 19 is driven by an actuator 35.

In FIG. 2, 46 to 50 are the motor actuator 21, the blower 15, the magnetic clutch 28, the motor actuator 30, and
This is a drive circuit that drives the motor actuator 35.

a manual setting device 33 for manually setting the blower air volume;
An inside air temperature detection sensor 36 that detects the inside temperature of the vehicle;
A solar radiation detection sensor 37 detects the amount of solar radiation, an evaporator outlet air temperature detection sensor 38 detects the evaporator exit air temperature, that is, the temperature at point A, an outside air temperature detection sensor 39 detects the outside air temperature, and the opening degree of the mix door 17 is detected. A potentiometer 41 and a temperature setting device 40 for setting the cabin temperature are provided. The output of the manual setting device 33, the output of the inside air temperature detection sensor 36, the output of the solar radiation detection sensor 37,
The output of the evaporator outlet air temperature detection sensor 38, the output of the outside air temperature detection sensor 39, the setting output of the temperature setting device 40, and the output of the potentiometer 41 are connected to the A/
The signal is supplied to a D converter (hereinafter referred to as ADC) 43 and converted into digital data, and the digital data converted by the ADC 43 is supplied to the control device 12 .

The control device 12 basically includes a CPU 12 _-1 , a ROM 12 _-2 that stores programs, a RAM 12 _-3 that stores data, an input port 12 _-4 , and an output port 12 _-5 . From input port 12 _-4
According to the program stored in the ROM _12-2 , the output digital data of the ADC 43, the output of the on/off instruction switch 42 of the compressor 22, and the automatic/manual control instruction switch 4 of the blower 15.
4 and the output of the automatic/manual control switch 45 of the intake door 14 are read, and the output of ROM1 is read.
2 _- According to the program stored in -2
The data processed and calculated by the CPU 12 _-1 is output to the drive circuits 46 to 50 via the output port 12 _-5 .

The operation of one embodiment of the present invention according to the program stored in the ROM _12-2 will be explained with reference to the flowcharts shown in FIGS. 3 and 4.

When the program is started, initial settings such as clearing the RAM _12-3 are made (step a), and then digital data from the ADC 43, the output of the on/off instruction switch 42, and the output of the automatic/manual switches 44 and 45 are read. and stored in a predetermined area of the RAM _12-3 (step b). Following step b, T=T _R +K ₁ T _S +K ₂ T _A +K ₃ T _E −
The combined data of K ₄ T _D +K ₅ is calculated (step c). Here, T _R is the vehicle interior temperature, T _S is the amount of solar radiation,
T _A is outside air temperature, T _E is evaporator outlet air temperature,
T _D is the set temperature, K ₁ to _{K 5} are constants, and the total data T is a value obtained by correcting the deviation between the vehicle interior temperature and the set temperature of the temperature setting device 40 by solar radiation, outside air temperature, and evaporator outlet air temperature. Compatible.

Following step c, intake door control is performed (step d). The fifth step follows step d.
As shown by the solid line in the figure, known blower control is performed to control the blower 15 to the amount of air blown corresponding to the total data T via the drive device 47 (step e). After step e, the mix door 17 is controlled via the drive circuit 49 to an opening degree corresponding to the total data T as shown by the broken line in FIG.
The timing and period of operation of the cooler 26 are controlled by controlling energization and de-energization, and known temperature control is performed to control the interior temperature of the vehicle to a desired value (step f).

Following step f, data of T _F =T _E +K ₆ θ+β is calculated (step g). Here, K ₆ is a constant, θ is the opening degree of the mixer door, β is a correction value, and data T _F corresponds to the temperature of the air blown into the vehicle compartment 34. Here, θ=100% is the opening degree when all the air that has passed through the evaporator 16 is allowed to pass through the heater core 18.

Following step g, mode switching is performed in which the mode switching door 19 is switched in accordance with the data _TF to select the air outlet (step h). Step b is executed after step h. In addition,
The mode switching in step h is also known.

In one embodiment of the present invention, intake door control (step d) is performed as shown in FIG.
That is, following step c, it is checked whether the automatic/manual control switch 45 is instructing the automatic control state (step _d1 ), and if the manual control state is being instructed in step _d1 , the intake door is closed. Manual control is performed (step d ₂ ), followed by step e.

At step d ₁ automatic/manual control switch 4
When automatic control status is specified in 5, turn on/off.
It is checked whether the off instruction switch 42 indicates an on state, that is, whether the compressor 22 is instructed to be in the on mode (step _d3 ). When the compressor ₂₂ is instructed to be in the off mode in step d3, the intake door 14 is controlled to the full outside air introduction position following step _d3 , and all intake air is made into outside air (step _d4 ), and then step e is executed. be done.

When the compressor 22 is instructed to be in the on mode in step _d3 , following step _d3 , it is determined whether the outside air temperature T _A is less than or equal to the value x when it is decreasing, and the value y (x<y) when it is increasing.
It is determined whether or not it exceeds (step _d5 ).
If the outside air temperature is below the value x or y in step _d5 , step _d4 is executed following step _d5 . In this case, since there is sufficient cooling capacity, the intake door 14 is brought into a state where all outside air is introduced. At step d ₅ , the outside temperature is set to the value x
Or if it exceeds the value y, mix door 17
It is determined whether the opening degree θ is less than or equal to the value u when it is decreasing, and whether it is greater than the value v (u<v) when it is increasing (step d ₆ ). If the opening degree θ exceeds the value u or the value v at step _d6 , the intake door 1 is opened following step _d6 .
4 is controlled to an intermediate position between the inside air circulation position and the full outside air introduction position, that is, a partial outside air introduction state (step d ₇ ). In this case, when the mix door 17 is open to a certain extent, there is still room in terms of cooling capacity, so the intake door 14 mixes inside air and outside air.

If the opening degree .theta. is less than the value u or the value v in step _{d6 ,} then it is checked whether the automatic/manual instruction switch 44 is instructing the automatic control state (step _d8 ). When the automatic control state is instructed in step _d8 , the amount of air blown by the blower is controlled according to a certain pattern corresponding to the total data T as described above.

If the airflow rate of the blower is automatically controlled in step _d8 , then it is determined whether the airflow rate of the blower is less than or equal to _the value p when the airflow rate is decreasing, and the value q (p<q) when the airflow rate is increasing. It is determined whether or not the limit is exceeded (step _d9 ). When the blower air flow rate exceeds the value p or q in step _d9 , the intake door ₁₄ is controlled to an internal air circulation state following step d9 (step _d10 ). Following step _d10 , step e is executed. If the air flow rate of the blower is less than the value p or q in step _d9 , the intake door ₁₄ is opened following step d9.
is controlled to an intermediate position (step _d7 ).

Here, in addition to step d ₆ , step d ₈ and
By providing _d9 , it is possible to determine the heat load based on the opening degree θ of the mixer door 17 (the mixer door 17 is driven by the deviation between the set temperature of the temperature setting device 40 and the vehicle interior temperature). This means that the heat load judgment has been added.

Further, when the blower 15 is instructed to be in the manual control state in step _d8 , following step _d8 , the blower air flow rate _Wn in the manual control state is
Blower air flow rate when in automatic control state
Determine whether it is greater than W _a (step d ₁₁ ),
When the blower air volume W _a > W _n , following step d ₁₁ , set W _a to the blower air volume W _L (step d ₁₂ ),
When the blower air volume W _n ≧ W _a , following step d ₁₁ , set W _n to the blower air volume W _L (step d ₁₃ ),
Following steps d ₁₂ and d ₁₃ , step d ₉ is executed. That is, by steps _d11 to _d13 , the blower 1
When the control of blower 15 is manual control,
When the control is automatic control, the larger air blowing amount is selected, and the determination in step _d9 is made based on the selected air blowing amount.

In other words, the heat load for automatic switching of the intake door is also determined based on the air flow rate of the blower.
Even when the airflow rate of the blower is under manual control, if the airflow rate of the blower is greater than the airflow rate under automatic control, the determination in step _d9 is performed using the airflow rate under manual control,
If the airflow rate under manual control is less than the airflow rate under automatic control, the determination in step _d9 is made using the airflow rate under automatic control. Therefore, regardless of whether the blower is under automatic control or manual control, the intake door 14 will be controlled according to the heat load.

(Effects of the Invention) As described above, according to the present invention, thermal load determination is performed both when the air flow rate of the blower is under manual control and when the air flow rate of the blower is under automatic control. In addition, when the airflow rate of the blower is in the manual control state, the airflow rate is the larger of the airflow rate in the manual control state and the airflow rate in the automatic control state under the same conditions as in the manual control state. Since the heat load is determined and the suction port is controlled based on the result, the suction port can be controlled appropriately even when the blower air volume is manually controlled. Therefore, it matches the feeling of the passenger.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a block diagram showing the configuration of the present invention.
The figure is a block diagram showing the configuration of an embodiment of the present invention.
3 and 4 are flowcharts for explaining the operation of one embodiment of the present invention. FIG. 5 is a diagram showing the amount of air blown by the blower and the opening degree of the mixer door in one embodiment of the present invention. 1... Intake door, 2... Heat exchanger, 3... Air blower, 4... Control means, 5... Manual setting means, 6... Automatic/manual control instruction means, 7... Selection means, 8... Switching means, 9... Intake door position control means.

Claims (1)

[Claims] 1. A blower, a heat exchanger, a control means for outputting a blower air volume control signal in relation to a deviation between the vehicle interior temperature and the set temperature of the temperature setting means, and a manual setting means for outputting a blower air volume control signal. , an automatic/manual control switching means for selecting either one of the blower airflow rate control signal from the control means and the blower airflow rate control signal from the manual setting means and supplying it to the blower; and at least according to the blower airflow rate. In a vehicle air conditioner equipped with an intake door that is controlled to an inside air circulation state or a partial outside air introduction state,
Selection means for selecting one of the blower airflow rate control signal from the control means and the blower airflow rate control signal from the manual setting means, which is generating the blower airflow rate control signal that should generate a larger airflow rate. and,
a switching means for outputting either an output signal from the selection means or a blower air volume control signal from the control means in conjunction with switching of the automatic/manual control switching means; A vehicle air conditioner characterized by controlling an intake door.