JPS62970Y2 - - 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 control device for controlling a compressor during operation of a vehicle supercharger.

Conventionally, the system detects the negative pressure in the engine's intake manifold, and when this negative pressure becomes lower than a set level, it is determined to be accelerating or climbing, and the compressor is turned off, reducing engine negative pressure and smoothing acceleration and climbing. There are known methods that allow this. (Utility Model Application Publication No. 51-34139) However, such compressor control is based on the operating status of the supercharger, which supplies compressed air to the engine cylinders to increase engine horsepower when the engine speed reaches a set level. This was done independently of Hase. Therefore, even if the engine speed exceeds a set level and the supercharger operates, the compressor continues to be turned off due to the above-mentioned control even though the horsepower of the engine has increased, which sometimes interferes with air conditioning. Furthermore, since the pressure in the intake manifold becomes positive when the supercharger operates, there is a risk that the vehicle may be determined to be running at an accelerated pace even though it is running normally.

The purpose of this invention is to determine whether or not the supercharger is operating based on the output signal from the supercharger control unit when the intake manifold negative pressure is below a set level, and to control the compressor when the supercharger is operating. The above drawbacks are eliminated by preventing the compressor from being turned off, by increasing the operating rate of the compressor, or by increasing its capacity, and will be explained in detail below using examples.

FIG. 1 is a simplified configuration diagram showing an embodiment of a control device for a compressor for a vehicle air conditioner according to the present invention. , high load control section 3A, and supercharging control section 3
B, and a selection section 6 that selects the output signals from the control sections 2 and 3A and controls an electromagnetic clutch 5 that drives the compressor 4. As shown in FIG. 2, the normal control section 2 compares the temperature te on the surface side of the evaporator detected by the sensor 7 with a set level L, and when the temperature te decreases to the set level L.
When the set level L is reached, the electromagnetic clutch 5 is turned off, and when the set level L is exceeded, the electromagnetic clutch 5 is turned on.
This brings the evaporator temperature te to the set level L.
to prevent it from freezing. in this case,
Normally, the control unit 2 calculates the difference TP between the total signal TA obtained by calculating the vehicle interior temperature tr detected by the sensor 8 and the outside air temperature ta detected by the sensor 9, and the set temperature TD of the temperature setting device 10. At the same time, the set level L is controlled to gradually become smaller as the calculated value TP increases.
As a result, when the set temperature TD of the temperature setting device 10 becomes lower, the set level L becomes smaller, so the percentage of the compressor being turned on increases, thereby increasing the operating rate and controlling the compressor in accordance with the heat load. This makes it possible to control the compressor efficiently. High load control section 3
A is a negative pressure signal output from the negative pressure detector 11 that detects the engine intake manifold negative pressure.
The electromagnetic clutch 5 is turned off by detecting the signal Ca and outputting an off setting signal Cm in which the signal Ca becomes H level during acceleration. The supercharging control section 3B receives a signal from the supercharger control unit 12 that becomes H level during supercharging operation.
Cb is detected and the off setting signal Cm is prevented from being output from the high load control section 3A. When the off setting signal Cm is input, the selection section 6 selects the off setting signal Cm by selecting the off setting signal Cm based on the output signal from the normal control section 2, and turns off the electromagnetic clutch 5. When the off setting signal Cm is not input, the electromagnetic clutch 5 is controlled to be turned on or off based on the signal from the normal control section 2. The supercharger S is configured such that an actuator 19 controls a valve 18 that controls the flow path of exhaust gas exhausted from the engine 17.
The actuator 19 closes the valve 18 so that the exhaust gas is sent to the turbine 20 side, and the turbine 20 is driven to drive the compressor 21 to compress the air sent from the air cleaner 22 side. This compressed air is supplied to the cylinder side of the engine 17 via the intake pipe 30. Note that when the valve 18 is opened, exhaust gas is directly supplied to the muffler 24 side via the catalytic converter 23, and no supercharging operation is performed. The actuator 19 operates when an H level control signal Cb is supplied from the supercharger control unit 12, closes the valve 18, and performs a supercharging operation. The supercharger control unit 12 detects the engine speed based on the output signal from the ignition coil 25, and outputs an H level control signal Cb when the engine speed exceeds a set level.

The operation of the control device for a vehicle air conditioner compressor having the above configuration will be explained below using the flowchart shown in FIG.

First, when the vehicle is idling, decelerating, or in a steady running state, the intake manifold negative pressure is above a set level, and the negative pressure signal Ca from the negative pressure detector 11 is at the L level. Therefore, during high load, the control section 3A does not work and the signal from the normal control section 2 is supplied to the electromagnetic clutch 9 via the selection section 6, and the electromagnetic clutch 5 is turned on and off by the normal control section 2 for normal control. Ru. On the other hand, when the accelerator is depressed, the intake manifold negative pressure decreases to below a set level, and at this time, the negative pressure detector 11 detects this and outputs an H level negative pressure signal Ca.
Here, when the engine speed immediately increases and the engine speed exceeds the set level, the supercharger control unit 12 operates and outputs an H level control signal Cb to drive the supercharger and start the engine. Increase horsepower. Since the supercharging control section 3B prevents the off setting signal Cm from being output based on this signal Cb, the compressor is normally controlled. On the other hand, the intake manifold negative pressure falls below the set level,
Even if the H level negative pressure signal Ca is output from the negative pressure detector 11, when the vehicle is accelerating or running uphill, the engine speed does not increase to the set level or takes time to increase the speed. At this time, the supercharger control unit 12 does not work and the control signal is at H level.
Cb is not output. The supercharging control section 3B allows the off setting signal Cm to be output from the high load control section 3A, and the selection section 6 preferentially selects this off setting signal Cm to turn off the electromagnetic clutch 5. .
Further, according to the present invention, when the supercharger operates and the pressure of the intake manifold negative pressure becomes positive pressure, the negative pressure signal Ca of H level is output from the negative pressure detector 11, and the H level negative pressure signal Ca is output from the supercharger control unit 12. Since the level control signal Cb is output, normal control is performed.
In other words, the compressor is not turned on and no malfunction occurs.

In this embodiment, the operating state of the supercharger is determined when the intake manifold negative pressure is below the set level, and when the supercharger is not in the operating state, that is, when the control signal Cb is at the L level, the off setting signal Cm is determined. Although the explanation has been made assuming that the compressor 4 is turned off by outputting the
As shown in the figure, the operating rate of the compressor may be reduced by increasing the setting level L explained in FIG. It may be controlled in this manner.

As explained above, the control device for a vehicle air conditioner compressor according to the present invention includes a negative pressure detection means for detecting the engine intake manifold negative pressure, and a negative pressure detection means for detecting the engine intake manifold negative pressure when the engine intake manifold negative pressure falls below a set level. In a compressor control system equipped with a high-load control means that performs correction control such as turning off the compressor, reducing the operating rate of the compressor, or reducing the capacity of the compressor, the Supercharging control means that determines whether the supercharger is in an operating state based on the output signal and prevents the high load control means from performing the correction control of the compressor when the supercharger is in an operating state. Since the compressor is not turned off and the operating rate or capacity is not set to a low value when the supercharger is operating, the engine horsepower generated by the supercharger operation can be used effectively, improving air conditioning performance. It can be made into a good one. Further, since the engine can be given a load due to the drive of the compressor when the supercharger is operating, it is possible to solve the problem that the engine speed increases rapidly due to the operation of the supercharger and becomes difficult to operate. Also, by performing normal control when the supercharger is turned on, the operating rate of the compressor can be made higher than when the supercharger is off, so the heat load is reduced at this time, and when the supercharger is turned off. In this case, the heat load can be reduced, and the running performance can be improved since the engine load is reduced. Furthermore, since the compressor is controlled by detecting the output signal from the supercharger control unit, there is no need for a special sensor to determine the operating state of the supercharger, so costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the control device for a compressor for a vehicle air conditioner according to the present invention, and FIG. 2 is a characteristic diagram for explaining its operation.
3 and 4 are flowcharts for explaining the operation of the compressor control device according to the present invention. 1...Control device, 2...Normal control section, 3A...
High load control section, 3B... Supercharging control section, 4...
Compressor, 5...Electromagnetic clutch, 6...Selector, 11...Negative pressure detector, 12...Supercharger control unit, 17...Engine.

Claims (1)

[Scope of utility model registration request] The compressor is turned off or its operating rate or capacity is set to a small value when the intake manifold negative pressure falls below a set level based on an output signal from a negative pressure detection means that detects the intake manifold negative pressure of the engine. In a control device for a vehicle air conditioner compressor that has a high-load control means that performs a correction operation, supercharging is performed when the engine speed exceeds a set level based on an output signal from the engine speed detection means. Based on the output signal from the supercharger control unit that operates the supercharger to supply compressed air to the engine, it is determined whether or not the supercharger is in an operating state, and when the supercharger is in the operating state, the 1. A control device for a compressor for a vehicle air conditioner, comprising a supercharging control means for inhibiting the correction operation of the compressor by the high load control means.