JPH05238253A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To carry out the temperature control, adding the solar radiation quantity, not only adding the car room inside temperature, as for an air conditioner for vehicle. CONSTITUTION:As for a controller which is constituted so that an evaporator introducing temperature sensor 11 is installed at the front part of an evaporator 8 of an air conditioner for vehicle a an evaporator temperature sensor 12 is installed at the rear part of the evaporator 8, and a solar radiation quantity sensor is installed on a vehicle, and a compressor 9 is ON/OFF-controlled according to each detection temperature of the evaporator introducing temperature sensor 11 and the evaporator temperature sensor 12, the controller is provided with the function for changing the control map according to the detection value of the solar radiation quantity sensor. With this constitution, the temperature control added with the solar radiation quantity can be carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular air-conditioning system in which a map of on / off control of a compressor is changed according to the amount of solar radiation on a vehicle body.

[0002]

2. Description of the Related Art An air conditioner mounted on a vehicle such as an automobile basically operates on the same principle as that of an air conditioner installed indoors of a building, and keeps a constant temperature in the room (vehicle interior). However, unlike the case of a building, the situation outside the vehicle is large and changes constantly, so the temperature is finely adjusted according to this change. A conventional vehicle air conditioner manufactured to meet this demand has first to detect the temperature inside the vehicle compartment, and to control the temperature in consideration of the change situation of the temperature outside the vehicle.

The temperature inside the passenger compartment is detected not by detecting the temperature at any place in the passenger compartment because the air conditioner is mounted as a unit in the vehicle, but by detecting the temperature of the air introduced into the evaporator by a thermistor or the like. This is usually detected by the temperature sensor. Especially in a vehicle air conditioner called a fuel-saving type, the temperature data detected by the temperature sensor is input to the controller, and the compressor on / off control is performed according to a predetermined control map to control the temperature inside the vehicle interior. Will be kept constant.

[0004]

As described above, in the conventional vehicle air conditioner, the temperature of the air introduced into the evaporator is detected to control the ON / OFF of the compressor. Although the control is tentatively compatible, it does not correspond to other elements, that is, other than the air temperature in the vehicle compartment, and there is a case where the driver feels unsatisfactory when the vehicle is actually driven.

That is, for example, in early spring, the sunlight is strong, and even when the driver receives it through the glass and feels the heat, the air temperature in the vehicle compartment may not rise so much. In this case, the driver sets the set temperature of the air conditioner to Max Cool or a temperature close to it, and operates the air conditioner, but the temperature of the air introduced to the evaporator is low, and the evaporator that turns the compressor on and off Since the temperature is high, there is a problem that the blowing temperature becomes high and the driver cannot be satisfied.

The present invention has been made in view of this point, and for a vehicle in which the compressor can be turned on and off in response to factors other than the air temperature in the vehicle compartment, such as the above-mentioned solar radiation. It is intended to provide an air conditioner.

[0007]

As a means for solving the above problems, the present invention provides an evaporator introduction temperature sensor in the front part of an evaporator in an air conditioner for a vehicle and an evaporator temperature sensor in the rear part of the evaporator. The vehicle is provided with a solar radiation sensor, and the controller for controlling the compressor on / off by the temperature detected by the evaporator introduction temperature sensor and the evaporator temperature sensor is provided with the function of changing the control map according to the detection value of the solar radiation sensor. It has a different configuration. The control map can be easily changed by connecting to the controller a control map selection circuit capable of setting several control constants by a microcomputer or the like.

[0008]

With such a configuration, the control map can be changed according to the detected value of the solar radiation amount sensor. Therefore, by performing the on / off control of the compressor by the changed control map, the driver can feel the feeling. It will be possible to perform near temperature control.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an air conditioning duct, which is provided with an outside air inlet 2 and an inside air inlet 3, and an inside / outside air damper 5 that rotates around a shaft 4 is provided at the boundary between them. .. A blower fan 7 driven by a motor 6 is provided on the downstream side of the inside / outside air damper 5 to move the air in the duct 1 from the left side to the right side in the drawing.

The duct 1 is expanded in diameter downstream of the portion where the blower fan 7 is provided, and an evaporator 8 is provided inside the duct 1. Reference numeral 9 denotes a compressor, which is connected to the evaporator 8 via a pipe line 10. It should be noted that the condenser, the receiver dryer, and the like, which are components other than the evaporator forming the air conditioner, are not shown.

An evaporator introduction temperature sensor 11 is provided immediately upstream (front portion) of the air evaporator 8 and an evaporator temperature sensor 12 is provided immediately downstream (rear portion) thereof. A further downstream side of the duct 1 is divided into two system paths by a partition 13, and an air mix damper 15 which rotates about a shaft 14 is provided at the front part thereof. A heater core 16 is provided on one of the two divided system paths.

The outlet of the duct 1 is divided into a defogger outlet 17, a ventilator outlet 18 and a heater outlet 19, each of which has a def damper 21 and a shaft 22 which rotate about a shaft 20 as a center. A vent damper 23 that rotates and a heat damper 25 that rotates about a shaft 24 are provided.

In the air conditioner having such a structure, the inside / outside air damper 5 is maintained at an appropriate opening degree and the blower fan 7 is operated so that the duct is introduced from either or both of the outside air inlet 2 and the inside air inlet 3. Air is sucked into the inside of 1 and passes through the evaporator 8. At this time, if the compressor 9 is operating, the air is cooled and goes downstream.

Depending on the position of the air mix damper 15, if the air passes through the heater core 16, it is heated. In any case, the air that has flowed downstream is def damper 21 and vent damper 23.
And it is blown out from each outlet according to the opening degree of the heat damper 25. When operating in this way, the evaporator introduction temperature sensor 11 detects the temperature of the air introduced into the evaporator 8, and the evaporator temperature sensor 12 detects the temperature of the evaporator 8. These detected temperature data are input to a controller (not shown), and map control as shown in FIG. 2 is performed.

FIG. 2 will be described. This figure shows the control characteristics of the controller by the relationship between the temperature detected by the evaporator introduction temperature sensor 11 and the temperature detected by the evaporator temperature sensor 12, and three types of maps 1, 2 and 3 can be selected. It is like this. These maps 1, 2, 3
In each of the three types, the upper line indicates that the compressor relay is on, and the lower line indicates that the compressor relay is off.

FIG. 3 is a block diagram showing a system for controlling the operation of the compressor 9. In the figure, reference numeral 26 is a controller, and the evaporator introduction temperature sensor 11 and the evaporator temperature sensor
The temperature data detected by 12 is received, these values are compared with preset temperature values, and when there is a difference between them, a signal is sent to the compressor drive section 27 to control the compressor 9 to turn on and off, It tries to eliminate the difference.

In this case, the solar radiation sensor 28 is attached to an appropriate portion inside or outside the vehicle body,
The amount of solar radiation inside or outside the vehicle is detected, and the data is sent to the control map selection circuit 29. The control map selection circuit 29 selects an appropriate map from the three maps 1, 2 and 3 in accordance with the solar radiation amount data from the solar radiation amount sensor 28, and sends the result to the controller 29. The controller 29 outputs an ON / OFF control signal according to the selected map, and controls the compressor 9 via the compressor drive unit 27.

FIG. 4 is a flow chart for explaining the operation. To explain this, when starting in step S1, the values of each sensor and switch are input to the controller 26 in step S2, and in step S3, the control map selection circuit 29 first determines whether or not the amount of solar radiation is smaller than the set value ksun1. If it is smaller, the process proceeds to step S4 for selecting map 1, but if it is larger, the process proceeds to step S5 to determine whether the amount of solar radiation is smaller than ksun2. If the result is small, map 2 is selected in step S6, and if large, map 3 is selected in step S7.

When one of the maps is selected, the controller 26 sends a control signal to the compressor driving section 27 in step S9, and the compressor 9 is controlled according to the characteristics of the selected map. And step
S9 repeats. Map 1 shows the control characteristics when the amount of solar radiation is zero or weak.
Is the control characteristic when the amount of solar radiation is medium, and Map 3 is the control characteristic when the amount of solar radiation is large.

[0020]

Since the present invention is a vehicle air conditioner configured as described above, conventionally, only the temperature inside the vehicle compartment is controlled and controlled, so that it is possible to cope with external conditions such as solar radiation. Where it is not always satisfied, it is possible to control in consideration of the amount of solar radiation which is the external condition.
Therefore, control suitable for the driver's sensation can be performed, and since unnecessary cooling is not required, it is possible to obtain an air conditioner excellent in fuel saving characteristics.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

FIG. 2 is a graph showing a state in which control characteristics change due to map selection.

FIG. 3 is a circuit diagram showing a circuit of a control system.

FIG. 4 is a flowchart illustrating an operation.

[Explanation of symbols]

 1 Duct 7 Blower fan 8 Evaporator 9 Compressor 11 Evaporator temperature sensor 12 Evaporator temperature sensor 26 Controller 27 Compressor drive unit 28 Solar radiation sensor 29 Control map selection circuit

Claims (1)

[Claims] 1. An evaporator introduction temperature sensor is provided in a front portion of an evaporator in an air conditioner for a vehicle, an evaporator temperature sensor is provided in a rear portion of the evaporator, and a solar radiation sensor is provided in a vehicle. An air conditioner for a vehicle, wherein a controller for controlling on / off of a compressor based on a detected temperature is provided with a function of changing a control map according to a detected value of the solar radiation sensor.