JPH05116522A - Vehicle air-conditioning device - Google Patents

Abstract

PURPOSE:To provide a vehicle air-conditioning device which can precisely control air-conditioning without using an ambient air temperature sensor. CONSTITUTION:A control means 10 performs control of air-conditioning in accordance with a passenger compartment temperature detected by a passenger compartment temperature sensor 101, a solar radiation value detected by a solar radiation sensor 102, and a set temperature set by the passenger, and an ambient air temperature computed (from the vehicle compartment temperature and the solar radiation value) by a computing means 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a vehicle air conditioner that performs air conditioning control based on a set temperature and an outside air temperature.

[0002]

2. Description of the Related Art Conventionally, an indoor temperature sensor for detecting a vehicle interior temperature, an insolation sensor for detecting an insolation amount, and an outside air temperature sensor for detecting an outside air temperature are provided. , A vehicle air conditioner that performs air conditioning control (blowout temperature control, outlet control, blower fan air volume control, etc.) based on the outside air temperature and a set temperature set by an occupant is known (for example, a new model issued by Nissan Motor Co., Ltd. Manual Y32-1 June 1991). Here, the reason why the air conditioning control is performed in consideration of the outside air temperature is that the temperature at which a passenger feels comfortable differs depending on the outside air temperature (generally, it is more comfortable in winter when the outside air temperature is lower than in summer when the outside temperature is high). The temperature you feel will be lower).

[0003]

However, in general, the outside air temperature sensor is expensive, and the outside air temperature may not be accurately detected due to disturbance. In other words, the outside air temperature sensor is often attached to the radiator core support of the vehicle body, so the temperature detected by the outside air temperature sensor is higher than the actual outside air temperature due to the heat effect of the radiator when idling after running. Become. And in this case, since the air conditioning control is performed at an incorrect outside air temperature,
The occupant may be uncomfortable because control cannot be performed according to the occupant's taste.

An object of the present invention is to provide an air conditioning system for a vehicle, which enables accurate air conditioning control without using an outside air temperature sensor.

[0005]

The vehicle air conditioner according to the present invention will be described with reference to FIG.
An indoor temperature sensor 101 for detecting a vehicle interior temperature, a solar radiation sensor 102 for detecting a solar radiation amount, a vehicle interior temperature and a solar radiation amount detected by the indoor temperature sensor 101 and the solar radiation sensor 102 at the time of engine start or air conditioner startup. Calculating means 103 for calculating the outside air temperature from the sensors, and the respective sensors 101, 10
The control means 104 performs air conditioning control based on the vehicle interior temperature detected in 2, the amount of solar radiation, the set temperature set by the occupant, and the outside air temperature calculated by the calculation means 103. Solve the point.

[0006]

The calculating means 103 calculates the outside air temperature from the vehicle interior temperature and the amount of solar radiation detected by the indoor temperature sensor 101 and the solar radiation sensor 102 when the air conditioner is activated. The control means 104 performs air conditioning control using the outside temperature calculated by the calculation means 103 in addition to the vehicle interior temperature, the amount of solar radiation, and the set temperature. As a result, accurate air conditioning control can be performed without using the outside air temperature sensor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. The vehicle air conditioner according to the present invention, as shown in FIG. 2, is a compressor for a compression refrigeration cycle including a variable displacement compressor 2, a condenser 3, an evaporator 4, a liquid tank 5, and an expansion valve 6 driven by an engine 1. The laser unit 100 is provided. Variable displacement compressor 2
When the suction pressure exceeds the set pressure, the inclination angle is increased to increase the discharge capacity, and the set pressure is controlled by the solenoid current supplied from the CPU 41 shown in FIG. A constant capacity compressor may be used. Further, the evaporator 4 is arranged in an air conditioning duct 7 having an outside air introduction port 7a and an inside air introduction port 7b.

Each of the inlets 7a and 7b is provided with an inside / outside air switching door (intake door) 8 for controlling the flow rate of air introduced into the air conditioning duct 7. A blower fan 9, a heater core 10, and an air mix door 11 are provided in the air conditioning duct 7 as is well known. The air mix door 11 controls the blowing temperature by adjusting the amount of air passing through the heater core 10. Further, the air conditioning duct 7 is provided with a vent outlet 7c, a foot outlet 7d, and a defroster outlet 7e. It is adjusted according to the degree.

Here, the bend outlet 7c is for blowing air toward the upper half of the occupant, the foot outlet 7d is for blowing air toward the occupant's feet, and the defroster outlet 7e is a window. It is for blowing air toward the glass.

FIG. 3 shows a control system of the vehicle air conditioner. The control circuit 41 including a CPU, ROM, RAM, etc. (hereinafter simply referred to as the CPU 41) includes an input circuit 42.
The indoor temperature sensor 44 for detecting the vehicle interior temperature Tinc and the solar radiation sensor 45 for detecting the solar radiation amount Qsun are connected to each other via the.
Entered in. Also connected to the input circuit 41 are an ignition switch 46 and an off switch 47 that is turned on when the operation of the air conditioner is stopped.

Further, in the CPU 41, via an output circuit 49, an intake actuator 50 for driving the intake door 8, an air mix door actuator 51 for driving the air mix door 11, a vent door actuator 52 for driving the vent door 12, and a foot door 13 are provided. Is connected to a foot door actuator 53 that drives the defroster door 14, and a blower fan control circuit 55 is connected to the defroster door actuator 54 that drives the defroster door 14. A blower fan motor 9M is connected to the blower fan control circuit 55. Further, the compressor 2 is connected to the CPU 41 via a relay 56. Here, the CPU 41 controls the control means 103 and the calculation means 1
Make up 04.

Next, the procedure of the air conditioning control executed by the CPU 41 will be described with reference to the flow charts of FIGS. FIG. 4 shows a main flowchart, and first, step S1.
At 0, the initial setting is performed, and in the normal auto air conditioner mode, for example, the set temperature Tptc is initially set at 25 ° C. Next, in step S20, various information from each sensor is input. Explaining the data information of each of these sensors concretely, the set temperature Tptc is given from a control panel (not shown), the vehicle interior temperature Tinc is given from the indoor temperature sensor 44, and the solar radiation amount Qsun is given from the solar radiation sensor 45.

Next, in step S30, an outside air temperature process for obtaining an outside air temperature Tamb is performed by a procedure described later based on the vehicle interior temperature Tinc and the solar radiation amount Qsun obtained above.
In step S40, the solar radiation amount information from the solar radiation sensor 45 is corrected to Q'sun according to the procedure described in detail later. In step S50, the set temperature T set on the control panel is set.
Process ptc to a value T'ptc corrected according to the outside air temperature.
In step S60, from T'ptc, Tinc, Tamb, Q'sun, To = AT'ptc + BTamb + CQ'sun + D (T'ptc-Tinc) + E (1) (where A to E are constants) Is calculated, and the opening degree of the air mix door 11 is controlled according to the target outlet temperature To. The blowout temperature of air is controlled by this air mix door opening degree control.

In step S70, the compressor 2 is controlled, and in step S80, each door 1 is driven by the actuators 52, 53, 54 on the basis of the target outlet temperature To.
2, 3, 14 are driven to set a predetermined air outlet. In step S90, the intake door actuator 50
In this way, the intake door 8 is driven to control the selective switching of the suction port, that is, the outside air introducing port and the inside air introducing port. In step S100, the blower fan 2 is controlled on the basis of the target outlet temperature To to control the air volume from the outlet (blower fan air volume). After that, the process is step S2.
Return to 0.

FIG. 5 shows details of the outside air temperature processing in step S30 (FIG. 4). In FIG. 5, first, in step S31, it is determined whether or not the ignition switch 46 is turned on. If the step S31 is negative, the process returns to the process of FIG.
At 32, based on the indoor temperature Tinc and the solar radiation amount Qsun, the outside air temperature Tamb is obtained by Tamb = Tinc-αQsun, and the process returns to the process of FIG. Here, α is a value obtained from the characteristics shown in FIG. 6 according to the amount of solar radiation Qsun, and the larger Qsun is, α
Will grow.

According to the above procedure, the outside air temperature Tamb is calculated from the vehicle interior temperature Tinc and the solar radiation amount Qsun detected when the ignition switch 46 is turned on from the off state, that is, when the engine is started. Q'sun
From (Q'sun correction value), Tamb and T'ptc (correction value of Tptc), the target blowing control device To is calculated by the above equation.
Then, the blowout temperature, the blowout port, the suction port, and the blower fan air volume are controlled based on the target blowout temperature To. Thus, the outside air temperature Tamb is calculated from the vehicle interior temperature Tinc and the solar radiation amount Qsun.
Therefore, the outside air temperature sensor can be eliminated, the cost can be reduced, and the air conditioning control at the inaccurate outside air temperature due to the heat effect of the radiator unlike the conventional case can be avoided.

FIG. 7 shows a main flow chart (a diagram corresponding to FIG. 4) in another embodiment. In FIG. 7, in step S60 ′, To = AT′ptc + BTamb + CQ′sun + D (T′ptc−Tinc) + E + F∫ (T′ptc−Tinc) dt (2) (However, A to F are constants) Find the temperature To. That is, since the outside air temperature Tamb is a constant value that is a value obtained from the indoor temperature Tinc and the amount of solar radiation Qsun when the air conditioner is started, the above equation (1) cannot cope with the actual change in the outside air temperature. Therefore, in this embodiment, as shown in the equation (2), the value "F" obtained by integrating the difference between the set temperature T'ptc and the room temperature Tinc with time "F"
∫ (T'ptc-Tinc) dt "is added as a correction value for the outside air temperature Tamb, whereby the change in the outside air temperature can be dealt with.

In the above, the ignition switch 4
The outside air temperature T from the vehicle interior temperature Tinc and the solar radiation amount Qsun detected when 6 is turned on (when the engine is started).
Although amb is calculated, the outside air temperature Tamb may be calculated from the vehicle interior temperature Tinc and the solar radiation amount Qsun detected when the air conditioner is started. In this case, for example, as shown in FIG. 8, first, in step S31 ′, it is determined whether or not it is the first process after the air conditioner is activated. This is to judge whether or not the ignition switch 46 rises from OFF to ON when the OFF switch 47 is OFF when the ignition switch 46 is ON, and the OFF switch 47 is ON when the ignition switch 46 is ON. If so, it may be determined whether or not the off switch 47 falls from on to off. Then, when the step S31 'is denied, the process returns to the process of FIG.
If affirmative, the process of step S32 may be performed.

The equation for obtaining the outside air temperature Tamb is not limited to the above equation, and other equations may be used as long as they are obtained from the indoor temperature Tinc and the solar radiation amount Qsun. In addition, the target outlet temperature T
The equation for obtaining o is not limited to the equations (1) and (2).

[0020]

According to the present invention, the outside air temperature is calculated from the vehicle interior temperature and the amount of solar radiation detected by the indoor temperature sensor and the solar radiation sensor when the air conditioner is activated, and the calculated outside air temperature is used for air conditioning control. Since it is used, the air-conditioning control can be performed in consideration of the outside air temperature without using the outside air temperature sensor, and the cost can be reduced by eliminating the expensive outside air temperature sensor. Also, since the accurate outside temperature can be obtained without being affected by disturbance,
No more discomfort to the occupants.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a complaint.

FIG. 2 is a diagram showing a configuration of a vehicle air conditioner according to the present invention.

FIG. 3 is a block diagram showing a control system of this air conditioner.

FIG. 4 is a main flowchart showing an operation.

FIG. 5 is a subroutine flowchart showing details of outside air temperature processing.

FIG. 6 is a diagram showing a relationship between a solar radiation amount and a variable α.

FIG. 7 is a flowchart showing a main flowchart in another embodiment.

FIG. 8 is a subroutine flow chart showing details of an outside air temperature treatment in still another embodiment.

[Explanation of symbols]

 2 Compressor 9 Blower fan 11 Air mix door 41 CPU 44, 101 Indoor temperature sensor 45, 102 Solar radiation sensor 46 Ignition switch 47 Off switch 103 Computing means 104 Control means

Claims (1)

[Claims] 1. An indoor temperature sensor for detecting a vehicle interior temperature, a solar radiation sensor for detecting a solar radiation amount, a vehicle interior temperature and a solar radiation detected by the indoor temperature sensor and the solar radiation sensor when an engine is started or an air conditioner is started. A calculation means for calculating the outside air temperature from the amount, and an air conditioning control based on the vehicle interior temperature detected by each sensor, the amount of solar radiation, the set temperature set by the occupant, and the outside air temperature calculated by the calculation means. An air conditioner for a vehicle, comprising: