JPS61160317A - Compressor control device for car cooler - Google Patents

Abstract

PURPOSE:To obtain a sufficient engine output power by allowing the maximum stoppage time of a compressor for a car cooler to be shortened when an engine operates around at the medium load range so as to permit a sufficient accelerating feeling to be provided, and also by allowing the above-mentioned time to be lengthened when the engine operates at the higher load range. CONSTITUTION:A medium and high loading detectors 1 and 2 are arranged to detect the condition that an engine exceeds a medium load or a high load range allowing either a short time timer 3 (approximate 7sec) or a long time timer 4 (approximate 60sec) to operate when the detected signals are output from each of the detectors 1 and 2. A delay timer 5 is arranged to the outside of the short time timer 3 so as to start operating the moment the operation of the short time timer 3 has completed, allowing it to operate for the started period of 3sec. Signals for operations from these timers 3 through 5 are input into a control means 6 allowing the operation of a compressor for a car cooler to be suspended during the operation of the timers. And the engine loading becomes lower than the medium load range, a reset circuit 7 allows each of the timers 4 and 5 to be reset.

Description

[Detailed Description of the Invention] "Field of Industrial Application" The present invention relates to a control device for a compressor for a car cooler.
More specifically, the present invention relates to a control device that controls the operation of the compressor according to the operating state of the engine.

``Prior art'' Conventionally, a control device for a car cooler compressor detects the engine load condition and activates the compressor when the engine load becomes large, such as when the vehicle is accelerating, running at high speed, or when climbing a hill. In some systems, the engine load is reduced by stopping the engine, and if such a condition continues, the compressor is activated after a required period of time to ensure that cooling is not impaired.

``Problems to be Solved by the Invention'' However, in this type of control device, it is difficult to set the load value that stops the operation of the combination valve, and to what extent the maximum stop time of the compressor should be set. is not always easy.

For example, if you increase the value of the load that causes the compressor to stop operating, the compressor will continue to operate during acceleration under intermediate load conditions, resulting in a poor acceleration feeling.In particular, if you shorten the maximum stop time while increasing the load value, When a high engine load is required for a relatively long period of time, such as when entering a highway, sufficient acceleration cannot be obtained for the required period of time.

On the other hand, if the load value is reduced, the compressor stops frequently, which impairs cooling, and this tendency becomes particularly pronounced when the maximum stop time is increased while the load value is kept small.

In view of such circumstances, the present invention shortens the maximum stop time of a car cooler compressor when the load is around a medium load, depending on the load applied to the engine. The aim is to provide a good sense of acceleration during medium loads and at the same time to ensure that cooling is not impaired even if the compressor stops relatively frequently, while at the same time increasing the maximum compressor stop time when the load becomes large. By doing so, when the engine requires a high load for a relatively long period of time, such as when entering a highway, a sufficient large output of the engine can be obtained.

"Example" The present invention will be described below with reference to the illustrated embodiments.

In FIG. 1, 1 is a medium load detector (not shown) that detects when the load applied to the engine becomes medium load or higher; 2;
is a high load detector that detects when the load applied to the engine becomes a high load or higher, which is greater than the medium load.

These medium load detectors1. As the high load detector 2, for example, a magnet is provided on the accelerator pedal, and two reed switches are arranged along the locus of movement of the accelerator pedal.When the accelerator pedal is depressed for 1'ft, one An appropriate configuration may be used, such as a medium load when only the reed switch is activated and a high load when the accelerator pedal is further depressed and both reed switches are activated.

When the medium load detector 1 detects that the load applied to the engine is equal to or higher than the medium load, the medium load detector 1
The detection signal is input to the short time timer 3, and the short time timer 3 receives the detection signal and operates for a predetermined required time Ts, for example, 7 seconds.

On the other hand, when the high load detector 2 detects that the load applied to the engine exceeds a high load, the high load detector 2 detection signal is input to the long time timer 4, and the long time timer 4 In response to the detection signal, it operates for a predetermined time TI longer than the short time timer 3, for example, 80 seconds.

Further, a delay timer 5 is connected to the output side of the short-time timer 3, and this delay timer 5 starts operating at the moment when the operation of the short-time timer 3 ends, and runs for a predetermined required time. It operates only for Td, for example, for 3 seconds.

The activation signals of each timer 3.4.5 are input to the control means 6, and the control means 6 stops the operation of a car cooler compressor (not shown) while at least one of the timers is in operation. More specifically, this control means 6 controls each timer 3.4.
5, and an output section that controls an electromagnetic clutch provided in the drive system of the engine and the compressor to control the interlocking of the two, according to the determination result of the logic determination circuit. As described above, while at least one of the timers is operating, the electromagnetic clutch is disconnected to stop the operation of the compressor.

Although not shown, the logic discrimination circuit may also be configured to receive signals from a temperature sensor that detects the indoor temperature, a temperature sensor that detects the engine temperature, etc., and the logic discrimination circuit detects those conditions. The connection/cutoff of the electromagnetic clutch may be controlled by also determining the above.

Further, a reset circuit 7 is connected to the medium load detector 1, and upon receiving the signal from the medium load detector 1, the load applied to the engine becomes less than the medium load. At this time, the operation of the short time timer 3 and long time timer 4 is reset.

Next, the operation of the above configuration will be explained based on FIGS. 2a and 2b. In the same figure, when the load applied to the engine is less than a medium load, the control means 6 connects the electromagnetic clutch to operate (ON) the compressor. Even in this state, for example, the indoor temperature When the pressure decreases, the control means 6 disconnects the electromagnetic clutch and turns off the compressor.

In the following description, for convenience, it is assumed that the compressor is always operating when the load applied to the engine is less than a medium load.

From a state in which the load applied to the engine is less than a medium load, the accelerator pedal is depressed and the engine becomes more than a medium load but less than a high load, as shown in the wIIZa diagram, and this state lasts for the set time of short timer 3. When the load is continued for a shorter time than 〒8, first, when the load applied to the engine becomes medium load or higher, the medium load detector l detects this state, so the short time timer 3 is activated. This causes the control means 6 to stop the operation of the compressor.

When the engine load becomes less than medium load within a time shorter than the set time T8 of the short time timer 3, the reset circuit 7 is activated and stops the operation of the short time timer 3; At the same time, the delay timer 5 starts operating.

The timer activation signal is continuously input to the control means 6, so that even if the timer 3 stops operating for a short time, the compressor will not be activated.

Thereafter, as shown by the imaginary line A in FIG. 2a, when the set time Td of the delay timer 5 has elapsed, the control means 6 starts operating the compressor. However, when the engine load reaches a medium load or higher before the set time Td of the delay timer 5 has elapsed, such as during a gear change during start acceleration, the short time timer 3 is activated again. Even after the set time Td has elapsed, the compressor is still stopped.

When the engine is under a medium load or more and less than a high load for a period longer than the set time Ts of the short time timer 3, the set time Ts of the short time timer 3 elapses, and then the delay timer 5 is set. After the time Td has elapsed,
The compressor is now activated (see reference numeral B in Figure 2a).

Furthermore, the engine is under medium load or higher and lower than high load for a long time! ! When the compressor is activated and the engine is overloaded, the high load detector 2 activates only the long timer 4 and C! 2
(See symbol C in figure a), and that state is the long-term timer 4.
If the set time of 〒1 continues for a longer time than the second
(See reference numeral in figure a), the operation of the compressor is stopped until the set time TI of the long-term timer 4 elapses.

At this time, as shown by the imaginary line E in the SZa diagram, the reset circuit 7 does not operate even if the engine is at a medium load or higher but less than a high load, so the compressor γ remains stopped, and the imaginary line in Figure 2a As shown by F, if the load becomes less than medium load, the reset circuit 7 is activated and the compressor is immediately activated.

Next, as shown in FIG. 2b, when the load applied to the engine changes from less than a medium load to a high load or higher, the short timer 3 is activated by the medium load detector l. This causes the control means 6 to stop the operation of the compressor and subsequently the high load detector 2 activates the long timer 4.

In this case, even if the set time Ts of the short-time timer 3 has elapsed, the long-term timer 4 is still operating, so the compressor remains stopped, and the long-term timer 4
If the engine becomes less than medium load before the set time TI has elapsed, the reset circuit 7 operates in the same way as described above, stops the operation of the long timer 4, and starts the compressor (as shown in Fig. 2b). (See symbol G).

Furthermore, after the load applied to the engine exceeds a high load and the long-term timer 4 is activated, the set time T of the short-term timer 3 is
The engine is in operation before s elapses.

When the load becomes less than the load, the reset circuit 7 stops the operation of the long-term timer 4, stops the operation of the short-time timer 3, and operates the delay timer 5, so that the set time Td of the delay timer 5 The compressor is then activated (see reference numeral H in figure 2b).
.

In addition, when the load applied to the engine exceeds a high load and this condition continues for a time longer than the set time T1 of the long-term timer 4, after the short-time timer 3 is activated (second
(see reference numeral I in Fig. 2b), and the operation of the second play is stopped until the set time TI of the long-term timer 4 has elapsed (see reference numeral J in Fig. 2b). Therefore, in this case,
Generally, the compressor operation stop time is approximately the set time TI of the long timer 4, but in the maximum case, that is, when the load applied to the engine is medium load or higher, the set time Ts of the short timer 3 and the delay timer 5 are set. If the load applied to the engine becomes a high load or higher just before the set time Td of T
This is the time obtained by adding d.

Furthermore, at this time, as shown by the imaginary line in Fig. 2b, if the engine is at a medium load or higher but less than a high load, the reset circuit 7 does not operate as described above, so the compressor remains stopped. Further, as shown by the imaginary line in FIG. 2b, if the load becomes less than a medium load, the reset circuit 7 is activated and the compressor is immediately activated.

"Effects of the Invention" As described above, according to the present invention, it is possible to provide a good acceleration feeling during medium loads, and at the same time, to prevent cooling from being impaired even if the compressor stops relatively frequently. Furthermore, even when the engine requires a high load for a relatively long period of time, such as when entering a highway, it is possible to obtain a sufficient large output from the engine.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, and FIG.
2b are explanatory views for explaining the operation of FIG. 1, respectively. 1...Medium load detector 2...High load detector 3...
・Short time timer 4...Long time timer 5...Reset circuit 6...Control means 7...Delay timer

Claims (1)

[Claims] a medium load detector that detects when the load applied to the engine becomes a medium load or more; a high load detector that detects when the load applied to the engine exceeds a high load that is greater than the medium load; a short-time timer that operates for a required time in response to a signal from the load detector; a long-term timer that operates for a longer time than the short-time timer in response to a signal from the high-load detector; and a load applied to the engine. a reset circuit that resets the operation of the short-time timer and long-term timer when the load becomes less than medium load; 1. A control device for a car cooler compressor, comprising: a control means for stopping the operation of the car cooler compressor.