JPH0217165Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to an engine speed control device for an automobile, and in particular, to a device for controlling the idling speed of the engine when an air conditioner is activated. Regarding equipment.

(Prior art) Automotive air conditioners are powered by an engine, and when operating the air conditioner, the idling speed of the engine is increased to stabilize the operation of the air conditioner and to prevent engine stalling. I'm trying to protect the engine.

FIG. 1 shows a schematic configuration of an engine speed control device that performs the above-mentioned control.
When the air conditioner switch SW is turned on, the valve coil VC is energized by the current supplied from the battery B and the valve V opens, and negative pressure acts on the actuator ATR from the negative pressure source (negative pressure in the engine intake section). The actuator operates and the accelerator wire AW is pulled, increasing the engine's idling speed. Generally, the idling speed before this device is activated is about 600 rpm, and after this device is activated, the idling speed is set to be about 800 rpm. This compensates for the drop in idling speed due to an increase in engine load when the air conditioner is in operation, and ensures stable operation of the air conditioner.

(Problem to be solved by the invention) However, simply adjusting the engine idling speed in two stages by switching between when the air conditioner is operating and when it is not operating is unsatisfactory in terms of the operation of the air conditioner. .

This is the case, for example, when the air conditioner is used in an idling state, such as during traffic jams. Under such conditions, the cooling capacity of the air conditioner is significantly reduced, making it difficult to maintain the interior of the vehicle at the required temperature, resulting in an increase in the temperature within the vehicle. In such cases, occupants step on the accelerator to adjust the engine speed in order to obtain the desired cooling capacity, but performing such operations is not only extremely troublesome, but also
This also goes against the idea of energy conservation.

The present invention was developed in view of these conventional problems, and is designed to further increase the idling speed when the temperature inside the vehicle reaches a predetermined value while the vehicle is idling with the air conditioner operating. The present invention provides an engine speed control device for an automobile, which is configured to control the engine speed.

[Structure of the invention] (Means for solving the problem) The present invention for achieving the above object includes a compressor driven by a traveling engine,
An air conditioner that air-conditions a vehicle interior by operating the compressor, the air conditioner comprising: a first valve that opens when a switch for operating the air conditioner is turned on; a sensor that detects a temperature inside the vehicle; A temperature detection circuit that compares the interior temperature detected by the sensor with a reference temperature and outputs a signal when the interior temperature exceeds the reference temperature, and a temperature detection circuit that outputs a signal when the temperature detection circuit outputs a signal. An accelerator wire is connected to a second valve that opens and communicates with the first and second valves and to the output shaft, and when the first valve opens, negative pressure is introduced and the accelerator wire The present invention is characterized by comprising a two-stage negative pressure actuator that pulls the accelerator wire by one step, and when the second valve is opened, negative pressure is introduced to pull the accelerator wire one step further.

(Function) The engine speed control device of the present invention configured as described above functions as follows.

When the switch that operates the air conditioner is turned on, the first valve opens, and negative pressure is introduced into the two-stage negative pressure actuator, causing the accelerator wire to
Step by step. As a result, the idling speed of the engine increases by one step by the predetermined speed. Further, under this state, the temperature inside the vehicle interior detected by the sensor is compared with a reference temperature by the temperature detection circuit, and when the temperature inside the vehicle interior exceeds the reference temperature, the second valve is opened; Negative pressure is introduced into the two-step negative pressure actuator to pull the accelerator wire one more step. As a result, the idling speed of the engine is further increased by another predetermined speed.

Therefore, when the air conditioner is used during traffic jams, the idling speed will automatically increase due to the rise in the temperature inside the vehicle, so the air conditioner will adjust to the desired speed without any intervention from the occupants. You will be able to demonstrate your cooling ability.

(Example) Below, an example of the engine speed control device for an automobile according to the present invention will be described in detail based on the drawings.

FIG. 2 is a diagram showing an embodiment of an engine speed control device.

In the figure, S is a vehicle interior temperature sensor,
A bridge circuit is configured with resistors R ₁ to _{R 3} to form a temperature signal inside the vehicle and a reference temperature signal, and a comparator
Give to COMP. The reference temperature is, for example, a set temperature of an air conditioner, and the comparator COMP is configured to generate an output when the vehicle interior temperature exceeds the reference temperature. The output of the comparator COMP is given to the transistor Q, which causes the valve coil to
VC ₂ is energized and the second valve V ₂ is opened. This second valve _V2 operates the actuator ATR together with the first valve _V1 , which corresponds to valve V in FIG. The actuator ATR has the first internal
A first negative pressure chamber _R1 and a second negative pressure chamber _R2 are partitioned by a diaphragm _D1 and a second diaphragm D2, and communicate with the first valve _V1 and the second valve _{V2 ,} respectively.
An accelerator wire AW is connected to the output shaft 10. When the first valve V ₁ opens, negative pressure is introduced into the first negative pressure chamber R ₁ , and as the first diaphragm D ₁ moves, the contact member 20 moves the sealing material 30 and moves the accelerator wire AW to one step. Pull. Furthermore, when the second valve V ₂ opens, the second negative pressure chamber R ₂
Negative pressure is introduced into the diaphragm _D2 , and the sealing material 30 slides on the stay 40 as the second diaphragm D2 moves.
Pull the accelerator wire AW one more step.
This allows the engine's idling speed to increase by two steps.

Now, when the switch SW of the air conditioner is turned on, the first valve coil VC ₁ is excited and the first valve V ₁
opens, and the actuator ATR pulls the accelerator wire AW by one step. As a result, the engine's idling speed increases from about 600 rpm to about 800 pm, which compensates for the drop in idling speed caused by the operation of the air conditioner and allows the air conditioner to operate stably.

Next, the temperature inside the vehicle increases, comparator COMP produces an output, transistor Q turns on, and the second
When the valve coil VC ₂ is energized and the second valve V ₂ opens,
The actuator ATR pulls the accelerator wire AW one more step, increasing the engine's idling speed to approximately 1000 rpm.

Moreover, FIG. 3 is a diagram showing another embodiment of the engine speed control device.

The circuit shown in the figure operates in the same way as the circuit shown in Figure 2, but in its configuration, the switch SW of the air conditioner is connected to the first valve coil.
battery B rather than the one connected in series with VC ₁
are connected in series.

Therefore, this engine speed control device is
It will not operate unless the switch SW is turned on, and it is possible to operate more reliably than the engine speed control device shown in FIG. 2, and also to save energy.

In the above embodiment, the resistor R ₁ is a fixed resistor, but the present invention is not limited to this. By making the resistor R ₁ a variable resistor and linking this resistor with the room temperature setting resistor of the air conditioner, the reference The temperature may be set to room temperature. Further, the room temperature detection circuit in the above embodiment may utilize elements of a conventionally used autoamplifier.

[Effects of the invention] As is clear from the above explanation, according to the invention, the idling speed of the automobile engine can be automatically increased by two steps according to the operating condition of the air conditioner. To automatically prevent a decrease in cooling capacity during times of traffic congestion, etc., without the intervention of passengers, and to operate an air conditioner while coordinating with the car engine and protecting the engine. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a conventional engine speed control device, FIG. 2 is a circuit diagram of an engine speed control device according to the present invention, and FIG. 3 is a circuit diagram of an engine speed control device according to the present invention. FIG. 7 is a circuit diagram showing another embodiment. S... Vehicle interior temperature sensor, V ₁ ... First valve,
V ₂ ... second valve, R ₁ ... first negative pressure chamber, R ₂ ... second negative pressure chamber, SW ... switch, D ₁ ... first diaphragm, D ₂ ... second diaphragm, 10... Output shaft, 20... Hitting member, 30... Sealing material, 4
0... Stay, ATR... Actuator, AW
...Accelerator wire.

Claims (1)

[Scope of utility model registration request] An air conditioner that includes a compressor driven by a driving engine and air-conditions a vehicle interior through the operation of the compressor, the first valve being opened when a switch for operating the air conditioner is turned on. a sensor that detects the temperature inside the vehicle; a temperature detection circuit that compares the temperature inside the vehicle detected by the sensor with a reference temperature and outputs a signal when the temperature inside the vehicle exceeds the reference temperature; A second valve that opens when a signal is output from the temperature detection circuit, and an accelerator wire that communicates with the first and second valves and is connected to the output shaft, and the first valve opens. a two-stage negative pressure actuator that introduces negative pressure to pull the accelerator wire one step when the second valve is opened, and then introduces negative pressure and pulls the accelerator wire one more step when the second valve is opened; An automobile engine speed control device characterized by comprising: