JPS6022524A - Control device for car air-conditioner - Google Patents

Abstract

PURPOSE:To make it possible to satisfy a requested slight cooling capacity of a cooling device upon running of low rotational speed, by releasing the operation of an actuator in accordance with a detection signal indicating the rotational speed of the engine and a signal in association with the cooling capacity of the cooling device when the rotational speed is above a predetermined value but the cooling capacity is below a predetermined value. CONSTITUTION:An energizing circuit for a relay 4 is established by means of an auxiliary switch 6C connected in parallel with a lowest air-flow mode contact L0 in a manual air-flow adjusting switch 6. Further, the energizing coil of a relay 5 connected in parallel with the relay 4 is energized by a timer circuit 11 which is actuated by the output of an engien speed detecting circuit 10, to establish the energizing circuit of an actuator 9 for increasing the idle speed. When the cooling capacity required for a cooling device is low, the idle speed is not basically increased, but when the engine speed drops so that it becomes difficult to maintain its self-sustaining rotation, the output of the timer circuit 11 is energized by the relay 5 to increase the idle rotational speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a car air conditioner control system having a cooling device coupled to a vehicle engine and combined with an actuating device for increasing the idle speed of the vehicle engine.

Generally, in this type of device, when the cooling device is in operation, an actuating device is operated to increase the idle rotation speed to a certain value or higher.

However, in consideration of fluctuations in engine speed, the set value of idle speed is often set somewhat high for safety reasons, which increases the minimum cooling capacity required of the cooling system, resulting in a small There is a problem when you want to obtain a high cooling capacity.

In response to recent improvement in engine performance and reduction in rotational fluctuations, the present invention has been developed to provide a small amount of cooling capacity as expected when the engine is operated at a low rotational speed, such as when the engine is stopped. The purpose of the present invention is to provide a car air conditioner control device that can perform the following functions.

Therefore, in the car air conditioner control device mentioned at the beginning, the present invention includes a first signal generating means that generates a detection signal according to the rotational speed of the engine, and a first signal generating means that generates a detection signal according to the cooling capacity required of the cooling device. a second signal generating means for generating;
In addition, in response to the signals from these signal generating means, the engine rotation speed is at least a predetermined value that does not cause any trouble, and the cooling capacity required of the cooling system is below a predetermined value. It is characterized in that it comprises an electric control device adapted to deactivate the actuating device at certain times.

Since the present invention has a cooling mode in which the actuating device that increases the idle rotation speed is not operated, it is also effective in that power can be saved.

In carrying out the present invention, various detection means or switch means can be applied to the second signal generation means. Also,
It is also possible to configure the second signal generating means and the electric control device to be realized by one microcomputer.

FIG. 1 is an electrical wiring diagram showing an embodiment of the present invention. In the figure, numeral 1 represents an electromagnetic coupling device, and line L1
When the compressor IA is energized, the compressor IA of the cooling system is connected to an on-vehicle engine (not shown) to exert a cooling effect. The electromagnetic coupling device 1 is connected in parallel with the energizing coil of the relay 2, and contacts 2a, 2b of the relay 2 when the cooling device is in operation.
is closed to supply power to the circuit connected to line L2.

The electromagnetic coupling device 1 is energized and deenergized by the Tara arm 7 which is activated when the manual switch 3 is turned on. The configuration of the Tara amplifier 7 itself is known, and the air temperature becomes close to a preset temperature depending on the resistance value of the thermistor 8 that responds to the downstream air temperature of the evaporator (not shown) of the cooling device. The line Ll is energized or deenergized as shown in FIG. It is also well known that the manual switch 3 has an interlocking relationship so that the Tala arm 7 is operated only when one of the actuation contacts of the wind section switch 6 is turned on, and a detailed explanation thereof will be omitted here.

The air volume adjustment switch 6 is manually operated and has a movable contact, a contact Lo for selecting the lowest air volume mode, a contact M e for selecting the intermediate air volume mode, and a contact II i for selecting the highest air volume mode. These contacts are connected in parallel with the blower resistor 6B and in series with the blower motor 13, which is installed in the air duct together with the evaporator (not shown), as is well known.

An auxiliary contact 6C is further connected in parallel to the lowest air volume mode contact LO of the wind l111 node switch 6, and an energizing circuit for the relay 4 is formed via this contact 6C. relay 4
has normally closed contacts 4a and 4b, and forms an energizing circuit for an actuating device (for example, a vacuum switching valve connected to a means for increasing the intake pipe passage) 9 for increasing the idle speed of the engine (not shown).

The energizing circuit of the actuating device 9 is also formed by a relay 5 connected in parallel with the relay 4 mentioned above. The energizing coil of the relay 5 is energized by a timer circuit 11 activated by the output of the engine rotational speed detection circuit 10. The detection circuit 10 receives an ignition pulse from the ignition device through a terminal 10A, converts it into a voltage signal using a known circuit configuration, and compares the converted voltage with a reference voltage using a comparator to determine the rotational speed of the engine. It becomes high level at a predetermined rotation speed, for example, 500 rpm or less, and reaches a high level at 600 rpm.
The output that becomes low level is applied to the timer circuit 11 in the above manner. When the timer circuit 11 receives a high level signal, it produces an output signal that remains at the energizing level for a certain period of time. 13 is an in-vehicle panteri.

The feature of the present invention in the above circuit configuration is mainly that the line L2
This is related to the energization and deenergization of the relay 4.5 connected to the .

Now, in this device, when the air volume adjustment switch 6 is in the intermediate air volume mode or the maximum air volume mode, the contacts 2a and 2b of the relay 2 are
is closed. Therefore, whenever the cooling system is in operation, the actuating device 9 is supplied with power via the contacts 4a, 4b of the relay 4, and by increasing the engine rotational speed, the cooling system is able to maintain sufficient power even when the engine is stationary. Make the most of your abilities. In this operating state, the operations of relay 5, engine speed detection circuit 10, and timer circuit 11 are essentially unrelated.

However, when the air volume control switch 6 is in the lowest air volume mode, the relay 4 is energized and opens its normally closed contacts. At this time,
The circuit of relay 5 is effective for increasing the idle rotation speed. In other words, when the air volume switch 6 is in the lowest air volume mode and the cooling capacity required of the cooling system is small, the idle rotation speed is basically not increased, and although a sufficiently small cooling capacity is exerted, the engine rotation The relay 5 is energized by the output of the speed timer circuit 11,
It acts to raise the idle rotation speed.

Thus, when the required capacity of the cooling system is small, this device can compress i1A without interfering with engine rotation.
By operating at low speed, a sufficiently small cooling effect can be achieved and power can be saved.

Note that in the configuration shown in FIG.
Of course, the air volume adjustment mode can be set to three or more levels as shown in the figure. In that case, the auxiliary contact 6C is not limited to one contact corresponding to the lowest air volume, but may also be used in the next low air volume mode. Furthermore, the timer circuit 11 may not be employed, and the relay 5 may be energized while the detection circuit 10 is generating a signal indicating that the engine speed is low. The combination circuit of relays 2.4 and 5 may be replaced with a semiconductor logic circuit as long as it satisfies the logic of logic. In addition, the air volume can be adjusted based on the outside temperature, inside temperature,
In a car air conditioner control device that automatically controls according to a target set temperature, etc., movable parts (for example, an air mix damper in an air mix type car air conditioner) that are moved by an electric signal generated by the automatic control device itself or by the automatic control device. ) The energizing circuit for the relay 4 may be formed by a switch means interlocked with the energizing circuit.

Furthermore, it is of course possible to use a microcomputer as the automatic control device.

FIG. 2 shows another method of detecting the cooling capacity required of the cooling device. In this method, when the compressor IA is of a variable capacity type, when its capacity is at the lowest level,
The relay 4 is energized to stop the actuating device 9 from operating.

In the figure, the capacity detection circuit 15 is moved together with the capacity adjustment member of the compressor IA, or is incorporated in a capacity control bag N (not shown) that is intended to move the capacity adjustment member.
When the capacity of the compressor IA is set to the minimum, the relay 4 is energized by energizing the relay coil of the relay 14 and closing its contacts 14a and 14b.

As described above, in the present invention, it is possible to satisfy the minimum cooling capacity required at low engine speeds such as when the vehicle is stopped, and at the same time, it is possible to satisfy the minimum cooling capacity when the engine rotation speed is low, such as when the vehicle is stationary. It is also possible to save power.

[Brief explanation of the drawing]

FIG. 1 is an electrical wiring diagram showing an embodiment of the present invention, and FIG. 2 is an electrical wiring diagram showing a modified embodiment of the invention. 1... Electromagnetic coupling device, IA... Compressor of cooling device,
2.4.5...Relay, 6...Air volume adjustment switch (
second signal generating means), 9...actuating device, IO...
Engine rotation speed detection circuit (first signal generation means), 1
5...Capacitance detection circuit (other second signal generation means). Representative Patent Attorney Takashi Okabe

Claims (1)

[Scope of Claims] (11) A car air conditioner control device having a cooling device coupled to an on-vehicle engine and combined with an actuating device for increasing the idle rotation speed of the on-vehicle engine, comprising: detection according to the rotation speed of the engine; a first signal generating means for generating a signal; a second signal generating means for generating a signal corresponding to the cooling capacity required of the cooling device; and the signal from the first and second signal generating means. an electric control device configured to release the operation of the actuating device when the rotational speed of the engine is above a predetermined value and the cooling capacity required of the cooling device is below a predetermined value in response to A car air conditioner control device comprising: (2) the second signal generating means is a manually operated air volume side switch, and the air volume switch indicates whether the air volume is at a minimum or not; The car air conditioner control device according to claim 1, which is configured to generate an electric signal. (3) The cooling device includes a variable capacity compressor that can adjust the refrigerant discharge volume per unit stroke, Furthermore, the car air conditioner control device according to claim 1, wherein the second signal generating means indicates whether the capacity of the variable capacity compressor is smaller than a preset reference capacity or not. .