JPH0798446B2 - Air conditioner for vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle air conditioner, and more specifically to a vehicle air conditioner that compensates for the directional characteristics of a solar radiation sensor.

(Prior Art) In a vehicle air conditioner, a photoelectric conversion element is used as a solar radiation sensor for detecting the amount of solar radiation, and the drive of the air conditioner drive device is corrected by the output of the solar radiation sensor. -24247, and the one in which the amount of solar radiation is detected by a temperature-resistance change element such as a thermistor to correct the drive of the air conditioner drive device is disclosed in Japanese Utility Model Publication No. 51-118644. Is disclosed in.

Furthermore, as disclosed in, for example, Japanese Patent Publication No. 59-39334, a vehicle interior air temperature control signal is calculated from above the information including the vehicle interior air temperature, the outdoor air temperature, and the amount of solar radiation, and the calculated vehicle interior air temperature control signal is calculated. According to the above, the one in which the heat exchange amount of the heat exchange means is controlled is disclosed.

(Problems to be Solved by the Invention) However, in each of the conventional examples described above, the gain added to the output of the solar radiation amount sensor is constant. However, the Nichinan-Chuo altitude changes depending on the four seasons. For example, the Nichinan-Chuo altitude decreases in the winter and increases in the summer. On the other hand, the solar radiation sensor has a directional characteristic because it is embedded in the surface of the dashboard and is provided so as to receive solar radiation through the filter. As a result, for example, when the outside temperature is low, the altitude in Nichinan falls, so the amount of solar radiation detected decreases due to the directional characteristics of the solar radiation sensor, and the amount of correction by the amount of solar radiation for the calculated vehicle interior temperature control signal decreases. There was a problem that it was not possible to control the temperature inside the passenger compartment.

It is an object of the present invention to provide a vehicle air conditioner that solves the above problems.

(Means for Solving Problems) In order to solve the above problems, the present invention is configured as shown in FIG.

A detection means including at least a solar radiation amount detection means 1 for detecting the amount of solar radiation received by the vehicle, a vehicle interior air temperature detection means 2 for detecting the vehicle interior air temperature, and an outside air temperature detection means 3 for detecting the outside air temperature; And a calculation means 5 for calculating a vehicle interior temperature control signal in relation to the set vehicle interior temperature of the temperature setting means 4 and the detection output from the detection means.
And a control means 9 for controlling the amount of heat exchange between the heat exchange means 6 and the air blown from the blower 7 to the vehicle compartment 8 in accordance with the calculated vehicle interior air temperature control signal from the calculation means 5. In addition, the changing means 10 for changing the gain added to the detection output from the solar radiation amount detecting means 1 in the calculation by the calculating means 5 according to the detected outside air temperature is provided.

(Operation) Therefore, the amount of heat exchange between the air blown into the passenger compartment and the heat exchanging means is controlled in accordance with the calculated passenger compartment temperature control signal calculated in relation to the set passenger compartment temperature and the detected temperature. To be done. However, the gain of the detected solar radiation amount, which is one of the calculation elements of the calculation vehicle interior temperature control signal, is changed depending on the outside air temperature. The change of the gain of the solar radiation amount depending on the outside air temperature increases the gain of the detected solar radiation amount at the time of calculating the vehicle interior temperature control signal in anticipation of the decrease of the detected solar radiation amount when the outside air temperature is low.

Therefore, regardless of the directivity characteristics of the solar radiation amount detecting means, favorable solar radiation amount correction is performed over all seasons, and a comfortable vehicle interior temperature is controlled.

(Example) Hereinafter, the present invention will be described with reference to Examples.

FIG. 2 is a block diagram showing the construction of an embodiment of the present invention.

21 is an air conditioner body, 22 is an air conditioner body 21
It is an arithmetic and control unit including a microcomputer for controlling.

The air conditioner main body 21 is directed from the upstream side to the downstream side of the duct 23 to select whether intake air is taken into the vehicle interior air or the outside air, and the air sucked through the intake damper 24 is taken into the vehicle interior. An evaporator that exchanges heat with the blower air while the blower 25 that blows air to 30 and the cooler 34 that will be described later are operating
26, in the air passing through the evaporator 26, a heater 28 to be described later
Mixer damper 27 that controls the amount of air that is split into two parts, a heater core 28 that circulates the cooling water of the internal combustion engine that acts as a heater to heat the passing air, and a mode switching damper 29 that selects an air outlet to the passenger compartment 30. Is equipped with.

The compressor 35, the condenser 36, the receiver tank 37, and the expansion valve 38 together with the evaporator 26 form a cooler 34. Furthermore, the rotation of the output shaft of the in-vehicle internal combustion engine is controlled by the pulley 39.
Have been transmitted to. The rotation of the pulley 39 is transmitted to the compressor 35 via the magnet clutch 40, and this transmission drives the compressor 35.

The air outlet to the passenger compartment 30 is formed by a vent outlet 31 that blows out air toward the occupant's face, and a heat outlet 32 that blows out air from the feet, one of which is provided by a mode switching damper 29. , Or both are selected.

The intake damper 24 is driven by the motor actuator 33.
The mix damper 27 is driven by the motor actuator 41, and the mode switching damper 29 is driven by the mode actuator 42. In FIG. 2, 44 to 48 are drive circuits for driving the motor actuator 33, the blower 25, the magnet clutch 40, and the motor actuators 41 and 42, respectively.

On the other hand, an inside air temperature sensor 50 for detecting the inside air temperature of the passenger compartment, an insolation amount sensor (a photoelectric conversion element is referred to as a detection end) 51 for detecting the amount of insolation, an evaporator outlet air temperature, that is, an evaporator outlet air temperature sensor for detecting the temperature at point A. 52, an outside air temperature sensor 53 for detecting the outside air temperature, a setting device 52 for setting the vehicle interior temperature, and a potentiometer 55 for detecting the opening degree of the damper. The output of each sensor, the output of the setting device 54, and the output of the potentiometer 55 are supplied by the A / D converter (hereinafter referred to as ADC) 57 via the multiplexer 56 and converted into digital data, which is then converted by the ADC 57. The converted digital data is supplied to the micro computer 58.

The microcomputer 58 basically comprises a CPU, a ROM storing programs, a RAM storing data, an input port, an output port and a timer. According to the program stored in the ROM, the output digital data from the ADC57 is read through the input port, and the data processed and calculated by the CPU is output through the output port to the drive circuit 44.
Output to ~ 48, the air flow rate of the blower 25, the operating time and period of the compressor controlled via the magnet clutch 40, the opening degree of the mix damper 27 is controlled, and the vehicle interior temperature is set to the set temperature by the setter 54. Controlled as much as possible.
The intake damper will be described assuming that the inside air circulation and the outside air intake are manually specified.

The operation of the present invention will be described with reference to the program stored in the ROM with reference to the flow chart of FIG.

When the program starts running, the RAM is cleared and other initial settings are made. Then, the output of the sensors 50-53 converted into digital data via the input port, the setter
The output of 54 and the output of potentiometer 55 are read and temporarily stored in a predetermined area of RAM (step a),
The vehicle interior air temperature control signal (hereinafter referred to as integrated data) calculation and control routine are entered. A first correction amount A is calculated from the amount of solar radiation T _S read in step a, for example, as shown in FIG. 4 and converted into integrated data described later (step b). The calculation in step b can also be performed by searching a table. Here, the first correction amount A is calculated by simply calculating the correction value for the integrated data from the detected amount of solar radiation without considering the directivity of the solar radiation sensor 51.

After step b, it is judged whether the outside air temperature T _A detected by the outside air temperature sensor 53 is α ° C. or higher (step c). If the outside air temperature is higher than α ° C. in step c, step c
Subsequently, it is determined whether the outside air temperature T _A is β (β> α) degrees or less (step d), and it is detected that the outside air temperature is in the range of α ° C. or more and β ° C. or less.

When the outside air temperature is above α ° C and below β ° C, the gain corresponding to the outside air temperature T _A is added to the first correction amount A obtained in step b.
A second correction amount B multiplied by G _V is calculated (step e). Here, the gain G _V is increased when the outside air temperature T _A is low. The reason is that there is no great difference in the amount of direct solar radiation directly hitting the body in winter and summer. When the outside air temperature T _A is less than α ° C. in step c, the first correction amount A is multiplied by the constant gain G ₁ to calculate the second correction amount B (step f). Here, the gain G ₁ is set to a value when the outside temperature of the gain G _V is T _A = α ° C. Furthermore, when the outside air temperature T _A exceeds β ° C. at step d, the first correction amount A
Is multiplied by a constant gain G ₂ to calculate a second correction amount B (step g). Here, the gain G ₂ is the outside temperature β ℃ of the gain G _V
It is set to the value at the time of. Therefore, the gain G _V is the fifth
As shown in FIG. 6, the second correction amount becomes as shown in FIG. 6 if the amount of solar radiation is shown as a parameter.

Following the steps e, f, g, the total data T = T _R + K ₁ T _E + K ₂ T _A + BK ₄ T _D + K ₅ is calculated and stored (step h). Here, T _R is the inside air temperature, and T _E is the evaporator outlet air temperature, which are detected by the temperature sensors 50 and 52. The outside air temperature T _A and the amount of solar radiation T _S are detected by the outside air temperature sensor 53 and the amount of solar radiation 51. Further, T _D is the set temperature set by the setter 54. K ₁ , K ₂ , K ₄ and K ₅ are constants. Therefore, the total data T corresponds to the deviation between the set cabin temperature and the detected inside air temperature, and further corresponds to the evaporator outlet air temperature T _E , the second correction amount related to the solar radiation amount, and the value corrected by the outside air temperature. Therefore, it can be said that the value is related to the heat load for controlling the vehicle interior temperature to the set vehicle interior temperature.

The relationship between the amount of solar radiation and the Nichinan middle altitude is as shown in FIG. 7 in the example of the Tokyo region, and this amount of solar radiation is detected by the solar radiation amount sensor 51. The output of the solar radiation amount sensor 51 with respect to the detected solar radiation amount is as shown in the first quadrant of FIG.
As shown in the second quadrant of FIG. 8, the output of the solar radiation sensor 51 changes with respect to the Nichinan middle altitude for the portion where the Nichinan middle altitude is 0 to 90 degrees. The first correction amount A for the amount of solar radiation shown in the first quadrant is as shown in the fourth quadrant of FIG. The correction amount of is as shown in the third quadrant of FIG. 8 (the third quadrant, the broken line shows the case where there is no correction).

Following step h, the blow rate of the blower 25 is controlled according to the preset control pattern shown in FIG. 9 (a) with respect to the total data calculated in step h (step i). . Next, as shown in FIG. 9B, the opening degree of the mixer damper 27 is controlled according to the preset control pattern corresponding to the total data T (step j), and then the drive setting of the compressor 35 is set. Temperature is ninth
As shown in FIG. 7C, the control is performed according to the control pattern set in advance corresponding to the total data T (step k). In step k, when the evaporator outlet air temperature T _E is equal to or higher than the temperature pattern shown in FIG. 9 (c), the magnet clutch 40 is energized to drive the compressor 35 to drive the temperature pattern shown in FIG. 9 (c). When the value is less than the value, the compressor is controlled so that the energization of the magnet clutch 40 is cut off. The horizontal axes of FIGS. 9 (a), (b) and (c) are the total data calculated in step h. The steps (i) to (k) control the vehicle interior temperature to the set vehicle interior temperature. Following step k, the data T _F = T _E + K ₆ θ + γ is calculated and stored (step 1). Here, θ represents the opening of the mixer damper 27, and the opening when the entire air passing through the evaporator 26 passes through the heater core 28 is θ = 100%.
(Full heat). Furthermore, K ₆ and γ are constants. Therefore, the data T _F corresponds to the temperature of the air blown into the passenger compartment.

Following step l, blowout mode control is performed to select the vent outlet 31 or / and the heat outlet 32 according to the data T _F (step m), and step b is executed again after step m. Intake damper 24
Is excluded from the flow chart of FIG. 3 because it is controlled to the outside air introduction state or the inside air circulation state according to the output of a manual switch (not shown) whose output is supplied to the microcomputer 58.

(Effect of the Invention) As described above, in the present invention, the gain added to the output from the solar radiation amount detecting means at the time of calculation by the arithmetic means is changed according to the outside air temperature, and the gain of the solar radiation amount depending on the outside air temperature is changed. The change is to increase the gain of the detected solar radiation amount when the vehicle interior temperature control signal is calculated in anticipation of a decrease in the detected solar radiation amount when the outside temperature is low. Therefore, despite the directivity characteristics of the solar radiation amount detection means, even when the Nichinan middle altitude is low,
The gain will be increased in anticipation of the decrease in the detected amount, and favorable solar radiation amount correction will be made over all seasons, and a comfortable vehicle interior air temperature will be controlled.

In addition, since the gain multiplied by the amount of solar radiation is made constant outside the predetermined outside air region, the amount of solar radiation is not corrected more than necessary, and it is possible to prevent excessive correction of a large change in outside air temperature due to a change in weather.

[Brief description of drawings]

FIG. 1 is a block diagram showing the structure of the present invention. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 3 is a flow chart used for explaining the operation of one embodiment of the present invention. 4 to 9 are characteristic diagrams for explaining the operation of one embodiment of the present invention. 1 ... solar radiation amount detection means, 2 ... vehicle interior air temperature detection means,
3 ... Outside air temperature detecting means, 4 ... Temperature setting means, 5 ...
Calculation means, 6 ... Heat exchange means, 7 ... Blower, 9 ... Control means, 10 ... Change means.

Claims (2)

[Claims] 1. A detection means including at least a solar radiation amount detection means for detecting an amount of solar radiation received by a vehicle, a vehicle interior air temperature detection means for detecting a vehicle interior air temperature, and an outside air temperature detection means for detecting an outside air temperature, and a vehicle. Temperature setting means for setting the room temperature, calculating means for calculating the vehicle interior temperature control signal in relation to the set vehicle temperature of the temperature setting means and the detection output from the detecting means, and the vehicle interior temperature control from the calculating means In a vehicle air conditioner equipped with a control means for controlling the heat exchange amount associated with a signal and the air blown from the blower to the vehicle compartment, the detection output from the solar radiation amount detection means at the time of calculation by the calculation means An air conditioner for a vehicle, comprising a changing means for changing the gain added to the vehicle according to the outside air temperature. 2. The vehicle air conditioner according to claim 1, wherein the changing of the gain by the changing means is performed within a predetermined outside air temperature range.