JPH0825943A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To allow an occupant to feel air-conditioned when he gets into a vehicle and enable the temperature in a cabin to rapidly become the set temperature by lowering the set cabin internal temperature by the specified temperature when a sensor detects the absence of the occupant. CONSTITUTION:When an occupant detecting sensor 61 detects the absence of an occupant, a set temperature correcting means 62 lowers the set temperature by the specified temperature. When this corrected set temperature is inputted to a temperature regulation control means 60, the temperature regulation control means 60 computes the temperature regulation command value on the basis of the corrected set temperature and the detection value of a room temperature sensor 44, an outside air temperature sensor 43 and a solar radiation sensor 42, and on the basis of this, the capacity of a compressor 28, the air quantity of a blower 16 and the opening of an air mixing damper 18 are adjusted. The interior temperature is thereby made lower than the set temperature. The occupant thereby feels air-conditioned when he gets into a vehicle, and the temperature in a cabin can rapidly become the set temperature.

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 suitable for vehicles for frequent delivery by passengers such as freight home delivery vehicles and garbage collection vehicles.

[0002]

2. Description of the Related Art A schematic structure of a conventional vehicle air conditioner is shown in FIG. Casing 12 of air conditioner 10
Inside air inlet 13 and outside air inlet 14 are formed on the upstream side of
A face outlet 20, a foot outlet 24, and a defrost outlet 23 are formed on the downstream side.

The inside air inlet 13 and the outside air inlet 14 are opened and closed by an inside air / outside air switching damper 15. The face outlet 20 and the foot outlet 24 are opened / closed by an outlet mode switching damper 25, and the defrost outlet 23 is opened / closed by an outlet mode switching damper 26.

A blower 16, an evaporator 17, an air mix damper 18, and a heater 19 are arranged in the casing 12. The evaporator 17 is a compressor 2 via a refrigerant pipe.
The refrigerant circulation circuit is configured by being connected to 8, the condenser 29, the receiver 30, the expansion valve 31, and the like.

The compressor 28 is driven by a traveling engine 35 via a pulley 33 and a magnet clutch 34. The cooling water of the running engine 35 circulates in the heater 19,
The air volume passing through the heater 19 is changed by the opening degree of the air mix damper 18.

When the blower 16 is driven by the motor 21, the inside air or the outside air is sucked into the casing 12 from the inside air intake port 13 or the outside air intake port 14 selected by switching the inside / outside air switching damper 15, and the blower 16 is operated by the blower 16. After being energized, it is cooled by passing through the evaporator 17.

This air is split by the air mix damper 18, a part of which is heated by passing through the heater 19 and then mixed with the remaining air bypassing the heater 19 to become conditioned air. Then, this conditioned air is blown out by opening and closing the blowing mode switching dampers 25 and 26. The face outlet 20, the foot outlet 24, and the defrost outlet are selected.
It is blown from 23 into the passenger compartment.

An evaporator temperature sensor 40 for detecting the temperature of the evaporator 17 or the air blown from the evaporator 17, and a refrigerant pressure sensor 4 for detecting the refrigerant pressure at the inlet of the compressor 28.
5. Potentiometer 41 for detecting the opening of air mix damper 18, solar radiation sensor 42, outside air temperature sensor 43, room temperature sensor
The detected values such as 44 are input to the control device 11.

Further, an operation switch 47, a temperature setting device 48, a blowout mode selection switch 49, an inside / outside air mode selection switch 50, an operation mode selection switch 51, and a blower are provided on a control operation panel 46 in front of the driver's seat. Air volume selection switch 5
2. Outputs of the AUTO switch 53 and the like for switching the control to automatic or manual are also input to the control device 11.

The control device 11 includes a magnet clutch 34,
Output to the drive motor 21 of the blower 16, the motor actuator 56 of the inside / outside air switching damper 15, the motor actuator 57 of the air mix damper 18, the motor actuator 58 of the blowout mode switching damper 25, the capacity control mechanism 60 of the compressor 28, etc. By controlling the operation, the vehicle interior temperature is automatically controlled to the set temperature set by the temperature setter 48.

[0011]

In a vehicle in which an occupant gets on and off frequently, since the door is opened and closed each time the occupant gets on and off, the temperature inside the vehicle changes accordingly. There is a problem that it does not provide a feeling of cooling during the period and it takes time for the temperature inside the vehicle to reach the set temperature.

[0012]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned problems, and is characterized in that a sensor for detecting the presence / absence of an occupant in a vehicle compartment and the sensor are used for the occupant. And a set temperature correction means for lowering the set temperature set by the temperature setter by a predetermined temperature when the absence of the sensor is detected.

Another feature is that a sensor for detecting the presence or absence of an occupant in the passenger compartment and a maximum cooling command means for bringing the air mix damper into the maximum cooling state when the sensor detects the absence of the occupant are provided. Especially.

[0014]

According to the first aspect of the invention, when the sensor detects the absence of an occupant, the set temperature correction means lowers the set temperature by a predetermined temperature.

According to the second aspect of the invention, when the sensor detects the absence of an occupant, the maximum cooling command means causes the air mix damper to be in the maximum cooling state.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the invention is shown in FIG. An occupant detection sensor 61, such as a seat switch or an infrared sensor, for detecting the presence or absence of an occupant is provided in the vehicle compartment, and the output of the occupant detection sensor 61 is input to the set temperature correction means 62. When the sensor 61 detects the presence of an occupant, the set temperature correction means 62 inputs the set temperature input from the temperature setter 48 to the temperature adjustment control means 60 as it is without correcting it.

The temperature control means 60 calculates a temperature control command value based on the set temperature input thereto and the detected values of the room temperature sensor 44, the outside air temperature sensor 43, and the solar radiation sensor 42.

The temperature control command value is used as the compressor control means 63.
Is input to the compressor 28 according to the temperature control command value.
Capacity is determined, and this determined value is input to the capacity control mechanism 59 of the compressor 28 to adjust the capacity of the compressor 28.

Further, when the temperature control command value is input to the blower control means 64, the blower air volume corresponding to the temperature control command value is determined here, and this determined value is output to the drive motor 21 of the blower 16 to blower 16. The rotation speed of 16, that is, the air volume is adjusted.

Further, when the temperature control command value is input to the air mix damper control means 65, the opening degree of the air mix damper 18 corresponding to the temperature control command value is determined here, and the determined value is the air mix damper 18 Is output to the motor actuator 41 and the opening degree of the air mix damper 18 is adjusted. In this way, the vehicle interior temperature is automatically controlled to the set temperature set by the temperature setter 48, as shown in FIG.

When the sensor 62 detects the absence of an occupant, the set temperature correction means 62 sets the set temperature to a predetermined temperature (for example, 5 degrees).
℃). When the corrected set temperature is input to the temperature control unit 60, the temperature control unit 60 controls the temperature based on the corrected set temperature and the detected values of the room temperature sensor 44, the outside air temperature sensor 43, and the solar radiation sensor 42. Since the command value is calculated and the capacity of the compressor 28, the air volume of the blower 16, and the opening degree of the air mix damper 18 are adjusted according to the temperature control command value, the vehicle interior temperature is lower than the set temperature as shown in FIG. Become. Note that other configurations and operations are similar to those of the conventional one shown in FIG.

A second embodiment of the invention is shown in FIG. In the second embodiment, the output of the occupant detection sensor 61 is input to the maximum cooling command means 66. When the occupant detection sensor 61 inputs a signal indicating that there is no occupant, the maximum cooling command means 66 outputs it to the air mix damper control means 65. Then, the air mix damper control means 65 determines that the air mix damper 18 is at the maximum cooling position, that is, the position at which the conditioned air is prevented from flowing into the heater 19.

Thus, the air mix damper 18 is at the maximum cooling position, and only the low temperature conditioned air bypassing the heater 19 is blown into the vehicle interior. Other configurations and operations are similar to those of the first embodiment shown in FIG. 1, and corresponding members are designated by the same reference numerals.

[0024]

According to the first aspect of the invention, when the sensor detects the absence of an occupant, the set temperature correction means lowers the set temperature by a predetermined temperature. Therefore, since the temperature inside the passenger compartment becomes lower than the set temperature while the passenger is getting off, the passenger working in the hot summer weather can get a cooling sensation when getting on, and the temperature inside the passenger compartment can quickly approach the set temperature. it can.

According to the second aspect of the invention, when the sensor detects the absence of an occupant, the maximum cooling command means causes the air mix damper to be in the maximum cooling state. Therefore, the temperature inside the passenger compartment is sufficiently lowered while the occupant is getting off, and a sufficient cooling feeling can be obtained when the occupant gets on the vehicle.

[Brief description of drawings]

FIG. 1 is a control block diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a temporal change in room temperature in the first embodiment.

FIG. 3 is a control block diagram showing a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional vehicle air conditioner.

Claims (2)

[Claims] 1. In a vehicle air conditioner for automatically controlling the temperature inside a vehicle to a set temperature set by a temperature setter, a sensor for detecting the presence or absence of an occupant in the vehicle and the sensor for detecting the absence of the occupant. At this time, the vehicle air conditioner is provided with a set temperature correction means for lowering the set temperature set by the temperature setter by a predetermined temperature. 2. A sensor for detecting the presence or absence of an occupant in the passenger compartment, and a sensor for detecting the absence of the passenger in the vehicle air conditioner for automatically controlling the passenger compartment temperature to a temperature set by a temperature setter. An air conditioner for a vehicle, comprising: maximum cooling command means for bringing an air mix damper into a maximum cooling state.