JPS6316566Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a compressor for a vehicle air conditioner, and particularly to a device for controlling a compressor in accordance with the operation of a charger that supplies compressed air to an engine.

In general, air conditioners for vehicles are equipped with an evaporator that cools the inside and outside air introduced from the inside and outside air switching door, an air mix door that adjusts the mixing ratio of cold air and warm air, a heater core, etc., and a compressor that cools the evaporator. is controlled to be turned off when the temperature on the evaporator side has cooled to near the freezing temperature, thereby preventing the evaporator from freezing. The compressor is also controlled by the difference between the inside air temperature and the temperature set by a temperature setting device provided on the operation panel. In other words, as the difference between the inside air temperature and the above-mentioned set temperature increases, the rate at which the compressor is turned on is increased to increase the operating rate of the compressor, and the compressor is operated by the amount determined by the air conditioning condition inside the vehicle. We are trying to save power by doing this.

However, such control of the compressor has been performed regardless of the operating state of the charger, which supplies compressed air to the cylinders of the engine to increase engine horsepower. Therefore, when the vehicle accelerates, the compressor operates and compressed air is sent to the engine cylinder, so when the engine horsepower increases, the operating rate of the compressor may be increased. The compressor absorbs some of the increased horsepower, which impairs the vehicle's acceleration performance, making it impossible to accelerate smoothly, especially when the compressor is operating at a high rate. If the conditions for small cases occur randomly, sometimes acceleration can be performed smoothly based on the operation of the charger, but at other times even if the charger operates, acceleration cannot be performed smoothly. Therefore, it has the disadvantage that it becomes difficult to drive at high speed.

An object of the present invention is to eliminate the above-mentioned drawbacks by detecting the operation of the charger and reducing the capacity of the compressor, which will be explained in detail below using examples.

1 and 2 are block diagrams showing one embodiment of a control device for a compressor for a vehicle air conditioner according to the present invention. This is a control device that sends the outside air temperature signal ta from the outside air sensor and the temperature signal from the inside air temperature sensor.
It has ports 2, 3, 4, and 5, etc., into which the temperature signal TS from the solar radiation sensor, the set temperature signal TD from the temperature setting device installed on the operation panel are input, and the air conditioner compressor. 6 to pulley 7
A port 9 outputs a signal for controlling the electromagnetic clutch 8 that transmits the rotational force from the compressor 6, and a port 11 outputs a capacity control signal Tc to a capacity controller 10 that controls the refrigerant discharge amount of the compressor 6, that is, the capacity of the compressor. and a port 13 into which the charger control signal Ca of the charger control unit 12 is input. The capacity of the compressor 6 can be controlled by changing the pulley ratio of the pulley 7, by changing the inclination of the swash plate in a swash plate type compressor, or by providing a bypass between the refrigerant discharge port and the refrigerant inlet of the compressor 6. A flow controller is provided in the bypass, and the flow controller controls the amount of refrigerant fed back from the discharge port to the inlet via the bypass, thereby controlling the refrigerant discharge amount and controlling the capacity. There are ways to do this. When the flow rate controller described above is used, the capacity controller 10 corresponds to this flow rate controller.

The air conditioning control device 1 receives the outside air temperature signal ta,
The detected temperature signal Tz is calculated by calculating the inside air temperature signal tr and the solar radiation temperature signal ts, and the total signal value Tp obtained by calculating the difference between this detected temperature signal Tz and the set temperature signal TD is calculated. demand. This device 1 generates a capacitance control signal that changes according to the characteristic X in FIG. 3 in response to the magnitude of the calculated value Tp.
It has a storage unit 14 that outputs Tc. The storage unit 14 is, for example, a read-only memory ROM.
is used, and the capacitance control signal Tc output from the storage section 14 is supplied to the output port 11 via the signal correction section 15. The control signal Ca from the charger control unit 12 input to the input port 13 is supplied to the charge state detection section 16, and the charge state detection section 16 determines whether the charger is set to the operating state based on the control signal Ca. If the charger is set to the operating state, the signal correction unit 15 is controlled, and the signal correction unit 15 performs correction to limit the increase rate of the capacity control signal Tc by a certain amount at this time. conduct. That is, when the charger does not operate and is in a normal running state, no correction is made by the signal correction section 15, and the capacity control signal Tc is supplied as it is to the capacity controller 10 via the output port 11, but the charger control unit In the state where the charger is activated and acceleration is performed by the operation of 12, the signal correction unit 15 is activated and the rate of increase in the capacity control signal Tc is suppressed. Figure 3 Y
shows the state of change in the capacitance of the compressor 6 when the rate of increase in the capacitance control signal Tc is suppressed by a certain percentage.

The above charger is connected to the engine 17 as shown in FIG.
The actuator 19 controls the valve 18 that controls the flow path of the exhaust gas exhausted from the turbine 20, and the actuator 19 controls the valve 18 so that the exhaust gas is sent to the turbine 20 side. By driving the turbine 20, the compressor 21 is driven to compress the air sent from the air cleaner 22 side, and then the compressed air is supplied to the cylinder side of the engine 17. Note that when the valve 18 is opened, the exhaust gas is directly supplied to the muffler 24 side via the catalytic converter 23, and no replenishment operation is performed.
The actuator 19 is connected to the charger control unit 1.
The charger control unit detects the engine speed based on the output signal from the ignition coil 25, compares this engine speed with a set value, and determines the set engine speed. When the value exceeds the value, a control signal Ca is output to the actuator 19 to operate the actuator 19 and perform a charging operation.

In the above configuration, the operation of the control device for a compressor for a vehicle air conditioner according to the present invention will be explained using the flowchart shown in FIG.
The air conditioning control device 1 calculates a detected temperature signal Tz by calculating each signal ta, tr, and ts, and calculates a value Tp obtained by calculating the difference between this detected temperature signal Tz and the set temperature signal TD. is calculated, and the capacitance control signal Tc, which is stored in advance in the storage unit 14 and changes depending on the magnitude of the calculated value Tp, is output. This capacity control signal Tc is a signal that increases in proportion to the calculated value Tp as it gradually increases, and saturates to a constant value after the calculated value Tp increases to a predetermined value. Now, assuming that the signal correction unit 15 does not correct the capacity control signal Tc, the capacity control signal Tc is applied to the capacity controller as it is, so the capacity controller 10 adjusts the capacity of the compressor 6 to the above value. Set to a size corresponding to the capacitance control signal Tc. That is, in this embodiment, when the calculated value Tp increases from 0 to 5 degrees, the capacity of the compressor 6 increases in proportion to this, and reaches the maximum value when the calculated value Tp reaches 5 degrees, and the calculated value Tp increases. However, it will be kept at this maximum value. Next, the charging state detection section 16 determines whether or not the charger is in an operating state. If the charger is in an operating state, the charging state detection section 16 controls the signal correction section 15 to send a signal. The correction unit 15 suppresses the rate of increase in the capacity control signal Tc by a certain percentage. Therefore, the capacity of the compressor 6 controlled by the capacity control signal Tc at this time is set so as to be smaller than when the charger is not operating.

For example, when the calculated value Tp is 5 deg, the compressor operates at maximum capacity when the booster is not operating, but operates at half capacity when the booster is operating. Therefore, since the compressor capacity is reduced during boosting, the load on the engine can be reduced and acceleration driving can be performed smoothly. In addition, the discharge capacity can be made constant and the cooling capacity can be kept constant. Incidentally, since the booster usually operates for a short period of time, even if the compressor capacity is reduced during this time, it does not pose much of a problem in terms of air conditioning control. Particularly in this embodiment, the calculated value Tp
As the detected temperature signal Tz increases,
As the difference between the temperature signal TD output from the temperature adjuster increases, the compressor capacity is controlled to increase, so that the cooling capacity is not compromised, passenger comfort is improved, and power consumption is reduced.

Further, in this embodiment, since the value Tp of the total signal includes factors of outside air temperature and solar radiation temperature, the following effects are achieved. For example, when a vehicle is pulled out of a shady garage into the scorching midsummer sun, the temperature inside the vehicle may be low, but the temperature inside the vehicle will rapidly rise due to the outside air temperature, solar radiation temperature, and radiant temperature from the road surface. However, in such a case, if the factors of the outside air temperature signal ta and the solar radiation temperature signal ts are not included, there will be a response delay in the vehicle interior temperature control, but according to the embodiment of the present invention, there will be a response delay. Such problems do not occur because the capacity of the compressor is controlled by a comprehensive signal that includes factors such as outside air temperature and solar radiation temperature. Further, according to this embodiment, the output signal Ca from the charger control unit 12 is used to determine the charge state.
Detection is extremely easy, and there is no need for a sensor or the like to detect the operating state of the charger. Furthermore, although the capacity of the compressor has been described as being changed, the operating rate of the compressor may be changed by driving the compressor on and off, controlling the time period during which it is turned on.

As explained above, according to the control device for a compressor for a vehicle air conditioner according to the present invention, the control unit outputs the supercharger control signal Ca to operate the supercharger based on the engine speed, etc.; a supercharging state detection means for receiving a supercharger control signal Ca;
Total signal value Tp obtained by calculating at least the difference between the inside air temperature signal and the set temperature signal
means for setting the capacity or operating rate of the compressor by outputting a pre-stored capacity control signal Tc which increases in proportion to the magnitude of the supercharger control signal Ca taken into the supercharging state detection means; and a capacity control means having means for controlling the rate of increase of the capacity control signal Tc based on the above, and the capacity control means relatively controls the capacity or operation rate of the compressor when the supercharger performs the supercharging operation. Since it is set to a small value, it is possible to smoothly accelerate driving based on the supercharger operation, and it is also possible to achieve good air conditioning control and power saving.

[Brief explanation of the drawing]

1 and 2 are block diagrams and configuration diagrams showing an example of a control device for a compressor for a vehicle air conditioner according to the present invention, and FIGS. 3 and 4 show a control device for a compressor for a vehicle air conditioner according to the present invention. 2 is a characteristic diagram and a flowchart for explaining the operation of the control device. 1... Air conditioning control device, 6... Compressor,
8...Electromagnetic clutch, 7...Pulley, 10...
Capacity controller, 12... Charger control unit, 14
... Storage section, 15 ... Signal correction section, 16 ... Addition state detection section.

Claims (1)

[Scope of utility model registration request] Supercharger control signal based on engine speed etc.
A control unit that outputs Ca to operate a supercharger,
The supercharging state detection means receives the supercharger control signal Ca, and increases in proportion to the magnitude of the total signal value Tp obtained by calculating the difference between at least the inside air temperature signal and the set temperature signal. means for outputting a pre-stored capacity control signal Tc to set the capacity or operating rate of the compressor; and an increase in the capacity control signal Tc based on the supercharger control signal Ca taken in by the supercharging state detection means. 1. A control device for a compressor for a vehicle air conditioner, characterized in that the control device comprises a capacity control means having a means for suppressing the rate.