JP3004435B2 - Vehicle air conditioner - Google Patents

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.

[0002]

2. Description of the Related Art In a conventional car air conditioner, the inside of the vehicle is maintained in an appropriate temperature and humidity environment. However, when the accelerator opening exceeds a predetermined value, for example, 90%, the operation of the air conditioner is stopped for several seconds to ten minutes. The vehicle is stopped for a short time of a few seconds, thereby reducing the load on the traveling engine of the vehicle that drives the compressor and giving priority to the acceleration function of the vehicle.

[0003]

In such a conventional air conditioner for a vehicle, when the opening and closing operations of the accelerator are frequently repeated, such as when the vehicle is traveling on a mountain road, the number of times the air conditioner is stopped is reduced. Therefore, there is a problem that the air conditioning function in the vehicle cannot be sufficiently exhibited.

[0004] The present invention has been proposed in view of the above circumstances, and a vehicle that can maintain the running performance while ensuring the air-conditioning function even if the vehicle repeatedly opens and closes the accelerator. It is intended to provide an air conditioner for use.

[0005]

In order to solve the above-mentioned problems, a vehicle air conditioner according to the present invention is provided with a compressor driven by an engine of a vehicle and capable of increasing or decreasing its capacity to perform air conditioning. The vehicle air conditioner has at least a closed space for pressurizing and compressing the refrigerant gas and a bypass hole for bypassing a part of the refrigerant gas in the closed space and returning to a suction side of the closed space. A compressor having an opening degree of the accelerator exceeding the predetermined value, such that the capacity of the compressor is reduced when the opening degree of the accelerator of the engine exceeds a predetermined value. Every time
To increase the accelerator opening of the engine.
When the pressure falls below the specified value, the capacity of the compressor increases.
To be added by the bypass hole.
Set the bypass flow rate of the refrigerant gas to an
By reducing or eliminating it according to the opening of the
Even if the accelerator operation is repeated, the air conditioning function
And a bypass flow rate control means for suppressing a decrease in the acceleration performance of the vehicle while maintaining the speed .

[0006]

According to the vehicle air conditioner of the present invention having such a configuration, the refrigerant gas is compressed and compressed in the closed space of the compressor, and a part of the refrigerant gas in the closed space is bypassed through the bypass hole. Is returned to the suction side of the enclosed space. At this time, by the control of the bypass flow rate control means, the bypass flow rate of the refrigerant gas bypassed by the bypass hole is such that the opening degree of the accelerator of the engine exceeds a predetermined value.
If that, the as capacity of the compressor is reduced
It is increased in response to the accelerator opening exceeding the predetermined value,
When the opening degree of the accelerator of the engine falls below the predetermined value,
Below the specified value so that the capacity of the compressor is increased
Is reduced or eliminated in accordance with the accelerator opening
Thus, even if the opening and closing operation of the accelerator is repeated,
Deterioration of vehicle acceleration performance is suppressed while air conditioning function is maintained
It is .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall system diagram, and FIG. 2 is a partial longitudinal sectional view of the scroll compressor of FIG. First, in FIG. 1, a refrigerant driven by a traveling engine 20 of a vehicle and compressed to a high temperature and a high pressure by a compressor 1 whose capacity is increased or decreased is cooled in a condenser 2 to become a liquid refrigerant, and the pressure is reduced by an expansion valve 3. Thereafter, in the process of flowing through the evaporator 4, the heat is exchanged with the air in the vehicle sucked by a fan (not shown) to evaporate and vaporize, and the refrigerant gas is compressed again by the compressor 1. The air conditioned by heat exchange in the evaporator 4 is blown into the vehicle.

Next, in FIG. 2, the compressor 1 is of a scroll type, and the fixed scroll 30 is
End plate 31 and spiral wrap 32 erected on the inner surface
And The orbiting scroll 50 is provided with an end plate 51 and a spiral wrap 52 erected on the inner surface thereof, so that the orbiting scroll 50 makes a revolving orbit while preventing its rotation. The fixed scroll 30 and the orbiting scroll 50 are engaged with each other to form a plurality of closed spaces 60. When the orbiting scroll 50 makes a revolving orbiting motion, the refrigerant gas is sucked into the closed space 60 from the suction side 61, and reaches the center while being compressed as the volume of the closed space 60 decreases, and the end plate 31. The liquid is discharged through a discharge port (not shown) formed in the nozzle.

A radial bypass hole 33 is formed inside the end plate 31 of the fixed scroll 30, and a piston 34
Are inserted in the bypass hole 33 so as to be able to slide in a sealed manner. A spring 36, one end of which is fixed by a support member 35, is disposed behind the piston 34, and the spring 36 urges the piston 34. The end plate 31 is provided with a through hole 37 that communicates the closed space 60 and the bypass hole 33. One right chamber 33a of the bypass hole 33 partitioned by the piston 34 communicates with the suction side 61 in a low pressure state, and the other left chamber 33b
Is connected to a passage 38 formed in the end plate 31 and a ventilation pipe 39, and further communicates with a low-pressure gas pipe 41 or a high-pressure gas pipe 42 via a switching valve 40 interposed in the ventilation pipe 39. . Here, the low pressure gas pipe 41 is connected to the suction side 6 in a low pressure state.
1, and the high-pressure gas pipe 42 communicates with a discharge side (not shown) in a high-pressure state.

Here, when the switching valve 40 is switched to communicate the low-pressure gas pipe 41 or the high-pressure gas pipe 42 with the left chamber 33b, the pressure difference between the left chamber 33b and the right chamber 33a and the pressure of the spring 36 are adjusted. The piston 34 moves forward to open the through hole 37, or the piston 34 moves backward to close the through hole 37. When the through hole 37 is opened, the inside of the closed space 60 is closed. A part of the compressed gas passes through the through hole 37 and passes through the right chamber 3
3a, the air is returned to the suction side 61, and the capacity of the compressor 1 is reduced. On the other hand, when the through hole 37 is closed, the compressed gas in the closed space 60 is entirely compressed and discharged.

By switching the switching valve 40 in this manner, the capacity of the compressor 1 is changed stepwise, in this example, into two steps, a small capacity and a large capacity. Here, by variously changing the drilling position and size of the through hole 37, the capacity reduction rate of the compressor 1 can be optimally selected. In FIG. 1, the acceleration switch 11 detects when an accelerator (not shown) reaches a fixed opening, for example, 90%. And controller 12
Is configured to input a signal from the acceleration switch 11 and switch the switching valve 40 to increase or decrease the capacity of the compressor 1.

When the accelerator is 90% open during acceleration operation of the vehicle, the switching valve 40 is controlled based on a command from the controller 12 to which the signal of the acceleration switch 11 is input.
Is switched, the compressor 1 is operated with a small capacity,
The air conditioning operation is continued. On the other hand, the accelerator opening is 90%
When the pressure falls below the range, the switching valve 40 is switched based on a command from the controller 12 to which the signal of the acceleration switch 11 has been input, and the compressor 1 is operated with a large capacity. Thus, even if the opening / closing operation of the accelerator is frequently repeated, the air conditioning operation is continued by reducing the capacity of the compressor 1, so that the air conditioning function is ensured. Further, since the load on the engine 20 is reduced by reducing the capacity of the compressor 1, the acceleration performance of the vehicle is not seriously impaired.

According to such an apparatus, when the opening of the accelerator exceeds a predetermined value, the operation of the air conditioner is continued by reducing the capacity of the compressor, so that the air conditioning function can be exerted. In addition, since the load on the engine is reduced by reducing the capacity of the compressor, a decrease in the acceleration performance of the vehicle can be suppressed. The present invention is particularly useful in a dual temperature vehicle air conditioner.

[0014]

In summary, according to the vehicle air conditioner of the present invention, there is provided a vehicle air conditioner which performs air conditioning with a compressor driven by an engine of the vehicle and whose capacity can be increased or decreased. A compressor having at least a sealed space for pressurizing and compressing the refrigerant gas and a bypass hole for bypassing a part of the refrigerant gas in the sealed space and returning the gas to the suction side of the sealed space, so that the opening to reduce the capacity of the compressor exceeds the predetermined value, the predetermined bypass flow rate of the refrigerant gas to be bypassed by the bypass hole
The value is increased in accordance with the accelerator opening that exceeds the value.
When the opening degree of the accelerator of the engine falls below the predetermined value,
To increase the capacity of the compressor,
The bypass flow rate of the refrigerant gas bypassed by the holes
Does not decrease in accordance with the degree of opening of the accelerator below the predetermined value
Even if the opening and closing operation of the accelerator is repeated
It is equipped with bypass flow rate control means that suppresses deterioration of the acceleration performance of the vehicle while maintaining the air conditioning function, so that a part of the refrigerant gas pressurized and compressed in the closed space of the compressor is passed through the bypass hole. By bypassing, it can be returned to the suction side of the enclosed space, and by the above-mentioned bypass hole
Controlling the bypass flow rate of the bypassed refrigerant gas
Control to reduce the capacity of the compressor
At this time, by the control of the bypass flow rate control means, the bypass flow rate of the refrigerant gas bypassed by the bypass hole becomes equal to the predetermined value of the opening degree of the accelerator of the engine.
If it exceeds , the capacity of the compressor will be reduced corresponding to the accelerator opening exceeding the predetermined value so as to reduce the capacity.
And the opening of the accelerator of the engine falls below the predetermined value.
And the same as above to increase the capacity of the compressor
Reduced or lost in response to accelerator opening below the value
In this way, the opening and closing operation of the accelerator is repeated.
Even if the air conditioning function is maintained, the acceleration performance of the vehicle decreases
There is suppressed, as a result, even when the accelerator opening of the engine increases beyond the predetermined value, the operation of the air conditioner is continuously performed in the air conditioning function is exhibited, and in that case, compressor By reducing the engine load, the engine load is reduced, the acceleration performance of the vehicle is maintained, and even if the vehicle frequently repeats opening and closing operations of the accelerator , the vehicle can be driven without lowering the air conditioning function. Thus, an industrially useful vehicle air conditioner can be obtained.

[0015]

[Brief description of the drawings]

FIG. 1 is an overall system diagram showing one embodiment of the present invention.

FIG. 2 is a partial vertical sectional view showing a variable capacity mechanism of the scroll compressor in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 11 Acceleration switch 12 Controller 20 Engine 30 Fixed switch 31 End plate 32 Lapping 33 Bypass hole 33a Right room 33b Left room 34 Piston 35 Supporting member 36 Spring 37 Through hole 38 Passage 39 Vent pipe 40 Switching valve 41 Low pressure gas pipe 42 High pressure Gas pipe 50 Orbiting scroll 51 End plate 60 Sealed space 61 Suction side

Claims (1)

(57) [Claims] 1. An air conditioner for a vehicle, which is provided with a compressor driven by an engine of a vehicle and whose capacity can be increased or decreased to perform air conditioning, wherein the air conditioner for a vehicle includes a closed space for compressing and compressing a refrigerant gas. A compressor having at least a bypass hole for bypassing a part of the refrigerant gas in the enclosed space and returning to a suction side of the enclosed space, and a capacity of the compressor when an opening degree of an accelerator of the engine exceeds a predetermined value. The bypass flow rate of the refrigerant gas bypassed by the bypass hole is increased in accordance with the accelerator opening exceeding the predetermined value so as to reduce
And the accelerator opening of the engine is equal to or less than the predetermined value.
When this happens, increase the capacity of the compressor
The refrigerant gas bypassed by the bypass hole
The bypass flow rate of the
The opening and closing operation of the accelerator is reduced or eliminated accordingly.
Even if it is repeated, the acceleration performance of the vehicle is maintained while maintaining the air conditioning function.
An air conditioner for a vehicle, comprising: a bypass flow rate control means for suppressing a decrease .