Process and circuit arrangement for controlling a consumer drive

Details Process and circuit arrangement for controlling a consumer drive Process and circuit arrangement for controlling a consumer drive

1990-04-12

1991-09-10

Tapolcai, William E.

Pumps

Condition responsive control of pump drive motor

With control of pump drive transmission

622283, 623234, 290 51, 417 34, F04B 4908

Patent

active

050469240

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a method for controlling a consumer driven by an internal combustion engine.
The invention further relates to a control apparatus for carrying out a method of the above kind; furthermore, the invention relates to the use of a pressure sensor arranged in the high-pressure region of a compressor of an air-conditioning system of a motor vehicle and intended for controlling the compressor, and finally, the invention relates to the use of a control apparatus for controlling the functions of an internal, combustion engine to control a consumer driven by the internal combustion engine.


BACKGROUND OF THE INVENTION

A method for controlling a compressor of an air-conditioning system is known, and in this method the power output of the internal combustion engine is increased, for example, by raising the engine speed or by increasing the quantity of air fed to the internal combustion engine, before putting the compressor into operation with a predetermined delay. In this method, the power output is increased each time by the amount of a predetermined fixed value. The delay before the compressor is switched on is necessary because the power output of the internal combustion engine cannot always be increased abruptly. It is also known, in a method of this type, to use a control unit for controlling the functions of an internal combustion engine. That means, the compressor of the air-conditioning system is no longer controlled directly by a thermostat mounted, for example, in the vehicle interior. Instead, the thermostat signal is sent to the control apparatus which, in response to this signal, first increases the power output of the internal combustion engine and then switches in the compressor with a delay. The increase in the power output of the internal combustion engine serves for keeping the speed of the internal combustion engine as constant as possible even when the compressor is switched on.
A disadvantage of this method is that the load on the internal combustion engine during switching-on of the compressor is not constant. For example, the switching-on of the compressor exerts a greater load on the internal combustion engine at high outside temperatures than at low temperatures. The load on the internal combustion engine when the compressor is switched on is higher when a high pressure prevails in the high-pressure region of the latter. This occurs when the compressor is switched on frequently because of high outside temperatures.
Therefore, in the known process and under specific preconditions, there are still pronounced fluctuations in power of the internal combustion engine when the compressor is switched on.


SUMMARY OF THE INVENTION

In contrast, the advantage of the method according to the invention is that, whenever the compressor is activated, the power output of the internal combustion engine is always at its optimal setting. The result is that the air-conditioning system is switched on virtually free of jerks.
In an especially preferred method, the pressure in the high-pressure region of the compressor is measured in order to determine the anticipated load on the internal combustion engine. The force required for starting the compressor is the greater, the higher the pressure is in the high-pressure region. As a result of the pressure measurement, the load occurring on the internal combustion engine when the compressor is put into operation can therefore be predetermined very accurately and the power output of the engine can be adapted accordingly.
Moreover, a method is preferred wherein the consumer is put into operation at the end of a predeterminable delay time. Sufficient time thereby remains to raise the power output of the internal combustion engine according to the load expected from switching on the consumer.
In a further preferred method, the temperature of the internal combustion engine is determined and the delay time is set as a function of this temperature. It is thereby possible, for example, to postpone switching on the consumer at l

REFERENCES:
patent: 4135368 (1979-01-01), Mohr et al.
patent: 4269033 (1981-05-01), Birch
patent: 4391242 (1983-07-01), Mashio
patent: 4414820 (1983-11-01), Morris
patent: 4488410 (1984-12-01), Seiderman
patent: 4556942 (1985-12-01), Russo et al.
patent: 4703627 (1987-11-01), Nakajima
patent: 4723416 (1988-02-01), Suzuki

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