JPS6233963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile that is capable of adjusting the temperature of blown air, and in particular that corrects the amount of temperature adjustment according to the amount of solar radiation that the vehicle receives.

Conventionally, this type of device is equipped with a temperature detector dedicated to or used for detecting thermal radiation due to solar radiation, and this temperature detector and other temperature detectors are connected in series to calculate their combined resistance. There is a known method that determines the amount of temperature adjustment depending on the temperature. However, according to this device, the thermal magnitude of solar radiation is determined only by the detection signal of a dedicated or dual-purpose temperature sensor that responds to solar radiation, and in reality, this temperature sensor is located on the instrument panel. Since it is installed at the bottom of the front window, etc., in addition to heat radiation from sunlight,
It is actually affected by the temperature inside the vehicle interior and the temperature outside the vehicle interior, so it has not been possible to accurately measure the thermal magnitude of solar radiation.

In view of the above, the present invention provides an air conditioner for an automobile that can determine the thermal magnitude of solar radiation without the influence of the temperature inside the vehicle interior and the temperature outside the vehicle interior, and can accurately correct the amount of temperature adjustment. The purpose is to provide

The present invention is characterized by, for example, detecting the temperature of the part of the vehicle interior that receives solar radiation and the temperature of the part that does not receive solar radiation, and further corrects the detected temperature of the part that receives solar radiation according to the temperature outside the vehicle interior. By determining the difference between the detected temperature of the part that does not receive solar radiation, the thermal magnitude of the solar radiation that the vehicle is receiving is determined from this difference without being affected by the temperature inside or outside the vehicle, and the temperature adjustment amount is corrected. By doing so, the temperature inside the vehicle can be maintained stably without being affected by solar radiation.

The present invention will be described below with reference to embodiments shown in the accompanying drawings. FIG. 1 shows the overall arrangement of the components. In the figure, a known air conditioning unit 1 is installed at the back of an instrument panel 10 of a vehicle. The air conditioning unit 1 includes a ventilation duct 3 passing through a dart board 2, an electric blower 4 disposed in the ventilation duct, a cooling heat exchanger 5, a heating heat exchanger 6, and an air mix damper (for temperature control). A/M damper) 7, and two dampers 8 and 9 for selecting the air blowing direction. The ventilation duct 3 opens its upstream end to the outside of the vehicle and into the vehicle interior, and has three outlet ducts 11, 13,
15, and the tips of these ducts are connected to the upper air outlet 12 located at the front of the instrument panel 10, the lower air outlet 14 located at the lower part of the instrument panel 10, and the front window glass at the upper surface of the instrument panel 10. A defroster outlet 16 facing the defroster outlet 17 is opened into the vehicle interior. The damper 8 has a blow-off duct 11 communicating with the upper blow-off port 12 and other blow-off ducts 13 and 15.
It is designed to open and close with the adjustment lever 18.
The opening/closing degree is adjusted to the desired degree by the vehicle occupant by a. The damper 9 is configured to open and close a blow-off duct 13 communicating with the lower blow-off port 14 and a blow-off duct 15 communicating with the defroster blow-off port 16, and opening and closing are switched by a switching lever 18b. Note that this damper 9 does not completely close the blow-off duct 15, and even when air is blown out from the lower blow-off port 14, a small amount of air is blown out from the defroster blow-off port 16.

The A/M damper 7 changes the temperature of the air blown out by changing the distribution of the air cooled by the cooling heat exchanger 5 passing through the heating heat exchanger 6. A regulator 19 consisting of an electromagnetic valve-controlled pneumatic actuator is coupled to the A/M damper 7 and determines the position of the A/M damper 7 by a command signal from an electrical control device 20 .

The electric control device 20 receives signals from temperature detectors 21, 22, 23, a temperature setting device 24, a position detector 25, and a switch 26 arranged in various parts of the vehicle, and sets the temperature inside the vehicle using the setting device 24. The system is configured to determine the amount of temperature adjustment to maintain the specified value.

The first temperature detector 21 is installed on the upper surface of the instrument panel 10 at a position where it directly receives the sunlight 1 that has passed through the front window glass 17. This position is suitable for being close to the occupants, especially those in the front seats, and being exposed to almost the same thermal effects of solar radiation as the occupants. The second temperature detector 22 is installed at a location that is not substantially exposed to sunlight and is approximately representative of the average temperature inside the vehicle. For example, it is installed at a position approximately midway between the upper air outlet 12 and the lower air outlet 14 so that the blown air does not directly hit the air outlet. The third temperature detector 23 detects the temperature outside the vehicle interior, and is installed in front of the engine cooling radiator. The temperature detectors 21, 22, and 23 are composed of heat-sensitive resistance elements such as thermistors, and generate temperature-dependent voltage signals by flowing a predetermined current.

The temperature setting device 24 is composed of a variable resistor equipped with an operating lever, and generates a voltage signal corresponding to the operating position of the occupant. The opening detector 25 is a negative pressure actuator 19
It is composed of a variable resistor with a movable contact attached to the output rod (not shown) of the A/M damper 7, and generates a voltage signal corresponding to the position of the A/M damper 7.

The detection switch 26 has a movable contact that interlocks with a link mechanism that connects the switching lever 18b and the damper 9, and this movable contact is activated when the blow-off duct 15 leading to the defroster outlet 16 is almost opened by the damper 9. is closed with a fixed contact.

FIG. 2 shows details of the electrical control device 20. 27 is a multiplexer, which selects first, second and third temperature detectors 21, 22, 23, temperature setter 24,
Select the voltage signal from the opening detector 25 and use the A/D
Output to converter 28. The A/D converter 28 converts the voltage signal from the multiplexer 27 into a digital signal in response to an A/D conversion start signal 29B from the computer 29, and outputs an end signal 28A to the computer 29 when the conversion is completed. This computer 29 is a so-called microcomputer, and is an A/
Based on the digital signal output from the D converter 28 and the on/off signal of the switch 26, the vehicle interior temperature corresponding to the detection data of the second temperature detector 22 is set to the setting data of the temperature setting device 24. It is programmed to calculate the amount of position adjustment of the A/M damper 7 to approximate the temperature using a digital calculation method. The computer 29 outputs the calculation result to the amplifier 30, and the amplifier 30 applies the amplified output signal to the regulator 19.

The electrical control device 20 includes a constant voltage circuit 31 that supplies constant voltage power to the internal circuit, and a reset circuit 32 that initializes the computer 29 when the constant voltage power is turned on. The operating power for the device is from the on-board battery 33 to the key switch 34 and main switch 3.
5. By turning on the key switch 34 and the main switch 35, the control device 2
Power is supplied to the blower motor 4 and the urging means (not shown) for putting the heat exchangers 5 and 6 into the operating state, thereby realizing the operating state of the air conditioner.

FIG. 3 shows the calculation processing procedure of the computer 29. The computer 29 is activated by closing the switches 34 and 35, and first sets the initial value N to 0 (step 36). Next, the multiplexer 27 is connected to the A/D
Converter 28 is activated to detect temperature detectors 21 and 2.
2, 23, the voltage signals of the temperature setting device 24 and the position detector 25 are sequentially converted into digital data signals, and this data is stored in the allocated address of the internal storage device (step 37). Of the data stored for the following explanation, the data corresponding to the detection signal of the first temperature detector 21 is the upper temperature Tu, and the data corresponding to the detection signal of the second temperature sensor 22 is the temperature Tu of the inside of the vehicle. Data corresponding to the representative temperature Tr and the detection signal of the third temperature detector 23 will be referred to as outside temperature Tam. Furthermore, the data corresponding to the setting signal of the temperature setting device 24 is called the set temperature Ts, and the data corresponding to the detection signal of the position detector is called the damper opening degree Tpo.

The computer 29 receives the on/off signal 26 of the switch 26.
Depending on the level of A, the damper 9 opens the air duct 15 to the defroster air outlet 16 (YES).
It includes a process (step 39) for determining whether or not (NO). Based on this determination, when the blow-off duct 15 is closed, a correction amount calculation is performed. Electrical control device 2
Immediately after the start of the 0 operation (when N = 0), the correction amount is calculated regardless of this judgment (step
28, 38A). In other words, if air is not being blown out from the defroster outlet 16 even if the outlet duct 15 is open, the first temperature sensor 21 will detect the influence of the temperature of the air blown out from the defroster outlet 16. This is because they do not receive it.

Data X indicating the amount of correction of the temperature adjustment amount for solar radiation is obtained by multiplying the difference between the upper temperature Tu′ after correction by the outside air temperature Tam and the representative temperature Tr of the vehicle interior by a preset constant Ko. requested (step 43). Here, the upper temperature after correction
When the outside air temperature Tam is higher than 20°C, that is, usually during or around summer, the upper temperature Tu becomes the corrected upper temperature Tu' (step 44). On the other hand, when the outside air temperature Tam is below 20°C, that is, during or around winter, the upper temperature Tu is corrected according to the outside air temperature Tam, and becomes the corrected upper temperature Tu' (step 41, 42). Here, the amount of correction
Tamu is calculated by the difference between a predetermined constant Cu and a value obtained by multiplying the outside air temperature Tam by a predetermined constant Ku. As the outside air temperature Tam decreases, the correction amount Tamu increases, and the upper temperature Tu after correction. ′ increases.

When the correction amount data X is a negative value, the correction amount data X is fixed to 0 in the next process (steps 45 and 46). This is the upper temperature after correction
This is because when Tu′ is lower than the representative temperature Tr of the vehicle interior, it is considered that the temperature is not substantially affected by the heat of the vehicle.

The calculator 29 then calculates the position adjustment amount data ΔTpo of the A/M damper 7 using the correction amount data X and other control parameters (step 47). For this calculation, the representative temperature Tr of the vehicle interior is set as the temperature without being thermally affected by the vehicle exterior temperature Ta and the solar radiation l.
The calculation formula shown in the figure is used, which is programmed to approach Ts, and among the constants K ₁ , K ₂ , K ₃ , K ₄ , and C, coefficients K ₁ , K ₂ , K ₃ , and K ₄ are the control parameters Ts,
The weights of Tr, Tam, and Tpo in the control system are set in advance.

Adjustment amount data △Tpo obtained from calculation results
is changed into a command signal for changing the position of the A/M damper 7 and output to the amplifier 30 (step 48). That is, depending on whether the adjustment amount data ΔTpo has a positive sign or a negative sign, it is output as a signal indicating the driving direction of the A/M damper 7.

The role of the electrical control device 20 can be summarized as follows. That is, the computer 29 repeatedly executes the calculation process described above and applies a command signal to the adjuster 19 so that the adjustment amount data ΔTpo gradually approaches zero. The A/M damper 7, which is driven by the regulator 19, adjusts the temperature at the representative temperature inside the vehicle.
Tr is always controlled to a suitable position to bring it close to the set temperature Ts.

Therefore, the adjustment amount data ΔTpo is calculated taking into account the correction amount X corresponding to the difference between the corrected upper temperature Tu' and the representative temperature Tr of the vehicle interior. Here, since the corrected upper temperature Tu' becomes higher than the representative room temperature Tr when the temperature rises due to solar radiation l on the instrument panel 10, the correction amount X is a value indicating the thermal magnitude of solar radiation. becomes. Therefore, the vehicle interior representative temperature Tr is controlled without being changed by the thermal influence of the solar radiation l.

Furthermore, under conditions where outside air temperature Tam is lower than 20℃ and heating is normally required, the front window glass 1
7 and the first temperature sensor 21 is installed avoiding the defroster outlet 16 as much as possible. The temperature will be lower than that due to the impact. However, the outside temperature
Corrected upper temperature Tu′ is calculated so that it increases from the detected upper temperature Tu in accordance with the decrease in Tam, so the corrected upper temperature Tu′ is close to the case where the corrected upper temperature Tu′ is only affected by the thermal influence of actual solar radiation. can be obtained, and the correction amount X is calculated as a value to correct the temperature adjustment amount only for the thermal magnitude of solar radiation. On the other hand, when the outside air temperature Tam is higher than 20° C., the influence of the outside temperature on the first temperature detector 21 is usually smaller than the influence of solar radiation, so no correction calculation is performed.

Depending on the passenger's preference, the opening degrees of the dampers 8 and 9 are changed via the adjustment lever 18a and the switching lever 18b. When the switch 26 detects that the upstream side of the blow-off duct 15 has been opened by the damper 9, the control device 29 stops the calculation of the correction amount data X by the calculator 29. Therefore, the calculator 29 calculates the previously calculated correction amount data
is stored as is in the memory, and the adjustment amount data ΔTpo is calculated based on that value. Therefore, the first
This masks the fact that the temperature detector 21 is affected by the temperature of the air blown out from the defroster outlet 16 and the upper temperature Tu corresponding to the detection signal does not show a correct value. The device is defroster outlet 16
While it is open, temperature control continues assuming that the thermal magnitude of solar radiation remains unchanged. When the defroster outlet 16 is closed, the correction amount X is newly calculated, and the temperature is adjusted according to the thermal magnitude of solar radiation at each point in time.

Note that the above embodiment is one embodiment of the present invention, and various modifications are possible.

For example, a temperature detector that is intended to receive substantial sunlight may be installed at multiple locations, including on the instrument panel 10, and the detected data indicating the highest temperature or the average value of these detected data may be obtained. The adjusted amount of the temperature means may be corrected by determining the corrected upper temperature, and determining the difference between the corrected upper temperature and the representative temperature in the vehicle interior. In this case, it goes without saying that only the detection data of the temperature sensor installed on the instrument panel 10 is saved while the defroster outlet is open.

Further, the calculation procedure in the process of determining the correction amount X may be changed as necessary.

Further, the effect (gain) of the correction amount X on temperature control may be changed depending on the air conditioning state, for example, heater mode or cooler mode. For example, the constant Ko may be changed depending on the mode.

In addition, in a device in which the opening and closing of the damper 9 is switched by an electric drive means and the command switch for switching is an electric switch, the detection switch 2
This command switch may take on the role of 6. Furthermore, a circuit means for delaying the on/off signal of the switch 26 and inputting it to the computer 29 may be added. This means that the defroster outlet 16
Once opened and then closed by the damper 9, it serves to mask the temperature in the vicinity of the top surface of the instrument panel 10 from being at an unfavorable value for some time.

As explained above, the present invention accurately detects the thermal magnitude of solar radiation without being affected by the temperature inside or outside the vehicle.
This has the excellent effect of being able to adjust the temperature inside the vehicle so that it is not affected by solar radiation.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing an embodiment of the apparatus of the present invention, FIG. 2 is a block diagram showing the structure of the electrical control device 20 in FIG. 1, and FIG. It is a flow chart showing a calculation processing procedure. 3...Ventilation duct, 4...Blower, 5,6...
Heat exchanger, 7, 19... Air mix damper and regulator forming adjustment means, 10... Instrument panel, 12...
Upper air outlet, 14... lower air outlet, 17... front window glass, 20... electrical control device serving as control means, 21... first temperature detector, 22... second temperature detector, 23...Third temperature detector.

Claims (1)

[Scope of Claims] 1. An automobile that is equipped with an air outlet to the vehicle interior on the downstream side of a ventilation duct in which a blower and a heat exchanger are arranged, and further equipped with an adjusting means for adjusting the amount of heat exchanged by the heat exchanger. In the air conditioner for a car, the first temperature detector is placed in a position that substantially receives the solar rays transmitted through the passenger compartment window, and the second temperature detector is installed in a position in the passenger compartment that does not substantially receive the solar rays. The detected temperature data of the temperature detector, a third temperature detector installed outside the vehicle interior, and the first temperature detector are corrected by the detected temperature data of the third temperature detector 6, and the corrected temperature data is An air conditioner for an automobile, comprising: a control means for correcting an adjustment amount of the adjustment means according to a difference between temperature data and temperature data detected by the second temperature detector.