JPH07166895A - Vehicle throttle valve controller - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In an engine equipped with both an idle-up mechanism for an air conditioner and a restart mechanism for facilitating restart, these controls are performed with a single actuator. To do so. [Construction] A vacuum switching valve (VSV) 18 having inlet ports 21 and 22 on the atmosphere side and negative pressure side and an outlet port 24 connected to one of the inlet ports 21 and 22 by switching these inlet ports 21 and 22 is provided. , This VSV18
The coil 28 of is connected in parallel with the electromagnetic clutch 31, the inlet port 22 on the atmosphere side is opened to the atmosphere, the inlet port 21 on the negative pressure side is connected to the port 16 of the intake system of the engine 1, and the outlet port 24 is connected. It is connected to the working chamber 10 of an actuator 7 that acts in a direction to close the throttle valve 4 when an intake negative pressure acts. When the engine 1 is stopped and the air conditioner is operated by the engine operation, the spring 15 of the actuator 7 opens the throttle valve 4 by a predetermined opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve control device for a vehicle, which is applied to a vehicle in which a compressor for compressing a refrigerant is connected to an output shaft of an engine via an electromagnetic clutch.

[0002]

2. Description of the Related Art Vehicles such as automobiles are usually equipped with an air conditioner (hereinafter, referred to as an air conditioner) which keeps the temperature inside the vehicle compartment constant and ventilates the air when necessary. This air conditioner has a cooling function and a heating function, and these are selectively or simultaneously operated to blow out air of a preset temperature from an outlet. Among the functions of the air conditioner, the cooling function drives the compressor for compressing the refrigerant on the output shaft of the engine, so part of the rotational output of the engine is consumed here. The number will drop slightly.

There is no problem if the engine speed is slightly reduced except when the engine is idling. However, when the engine is idling, the engine stops due to the decrease. There is a risk of
Therefore, conventionally, a so-called idle-up mechanism has been provided to prevent the engine from stopping by opening the throttle valve at a slight angle when the compressor of the air conditioner operates (see, for example, Japanese Utility Model Publication No. 56-46040).

The conventionally used idle-up mechanism guides the intake negative pressure of the engine to the working chamber of the actuator when the electromagnetic clutch connecting the compressor of the air conditioner to the output shaft of the engine is turned on, and the force causes the throttle valve to operate. It opens at a slight angle (about 6 degrees). If the throttle valve is opened even at a slight angle, the engine speed does not stop because the engine speed increases according to the angle.

On the other hand, a restart mechanism is sometimes used for a vehicle engine. In order to improve the restartability of the engine, this restart mechanism is designed so that when the engine is stopped
It opens. The structure for opening the throttle valve at a slight angle when stopped is to balance the intake negative pressure of the engine and the elastic force of the spring so that the diaphragm moves in the direction in which the balance is lost, and this diaphragm is linked to the throttle valve. There is used an actuator provided with a rod for guiding the intake negative pressure to the working chamber of this actuator.

In the restart mechanism having the above-mentioned structure, when the spring resilient force of the actuator receives negative suction pressure in the working chamber, the negative suction pressure resists the resilient force of the spring and the throttle valve is closed at a predetermined closed position. It will be used by setting to close up. As a result, when the engine operates and negative pressure is generated in the intake system, the negative intake pressure pulls the diaphragm against the elastic force of the spring and closes the throttle valve as described above. When stopped, the elastic force of the spring causes the throttle valve to open a predetermined angle.

[0007]

As described above, the idle-up mechanism and the restart mechanism each have a dedicated actuator, and the idle-up mechanism opens the throttle valve when receiving negative intake pressure. , The restart mechanism closes the throttle valve when receiving negative intake pressure. For this reason, in a vehicle equipped with both mechanisms, the structure around the carburetor becomes complicated and a large space is required for installation, and since the action is opposite, the coupling mechanism to the throttle valve becomes complicated. There was a problem.

The present invention has been made in view of this point, and a vehicle in which both the idle-up mechanism and the restart mechanism can be obtained by one actuator mainly by changing the structure and connection of the vacuum switching valve. It is an object of the present invention to provide a throttle valve control device of the above.

[0009]

As a means for solving the above-mentioned problems, the present invention relates to a vehicle in which a compressor for compressing a refrigerant is connected to an output shaft of an engine through an electromagnetic clutch, and is connected to an atmosphere side and a negative pressure side. A vacuum switching valve having an inlet port and an outlet port connected to any of the inlet ports by switching between the inlet ports is provided, and a coil of the vacuum switching valve is connected in parallel to the electromagnetic clutch and an inlet port on the atmosphere side is provided. Is opened to the atmosphere, the negative pressure side inlet port is connected to the intake system of the engine, and the outlet port is connected to the working chamber of the actuator that acts to close the throttle valve when negative intake pressure acts. It is a thing.

Further, as a vacuum switching valve, when the coil is energized, the valve element is pulled against a spring that presses the valve element so that the inlet port and the outlet port on the atmosphere side communicate with each other. It is the one to use the one.

Further, as an actuator, a diaphragm is stretched in the housing to form a working chamber, a spring for pressing the diaphragm is provided in the working chamber, and the base end of the rod is attached to the side opposite to the working chamber of the diaphragm. The rod end is connected to the throttle valve.

Further, the return force of the spring that presses the diaphragm in the actuator is greater than the return force of the spring wound around the throttle valve shaft to close the throttle valve, and the engine that acts on the actuator diaphragm is actuated. It is set to be smaller than the intake negative pressure of.

[0013]

With such a structure, the actuator operates the engine to close the throttle valve to a predetermined position during idling by the action of the intake negative pressure and the switching action of the vacuum switching valve. When the air conditioner is pulled, the rod is pushed so that it opens at a slight angle. When the engine stops and the intake negative pressure disappears, the diaphragm is pushed by the elastic force of the spring, and the throttle valve is opened by a slight angle by the rod pushed together with the diaphragm.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 is an engine, and 2 is a carburetor connected to its intake side. Inside the passage 3 of the carburetor 2, a throttle valve 4 is arranged so as to rotate around a shaft 5. The throttle valve 4 is well known in the related art, and is rotated around a shaft 5 to idle when it is oriented in a direction intersecting the passage 3 and is in a front open state when it is in a parallel state. A spiral spring 6 is wound around the shaft 5 and applies a force in the closing direction to the throttle valve 4.

Reference numeral 7 is an actuator. The actuator 7 has a diaphragm 9 stretched inside a housing 8, and one of two chambers partitioned by the diaphragm 9 serves as a working chamber 10. The other chamber 11 is communicated with the atmosphere through a hole 12, and a rod 13 having a base end connected to the diaphragm 9 projects from the hole 12. The base end of a link 14 is connected to the tip of the rod 13.

The tip of the link 14 is connected to a part of the throttle valve 4 so that when the rod 13 projects from the hole 12 of the housing 8, the throttle valve 4 is opened by a slight angle (about 6 degrees). The link 14 does not hinder the operation of opening and closing the throttle valve 4 by the driver stepping on the throttle pedal.

Inside the working chamber 10, a compressed spring 15 is interposed between the inner wall of the housing 8 and the diaphragm 9, and the working chamber 10 expands in the diaphragm 9 (the rod 13 projects). Direction). The elastic force of this spring 15 is the shaft 5 of the throttle valve 4.
It is larger than the winding force of the spring 6 wound around (the force that closes the throttle valve 4). Therefore, when the spring 15 pushes the diaphragm 9, the throttle valve 4 is closed.

The engine 1 is provided with a port 16, and the housing 8 of the actuator 7 is also provided with a port 17. Intake negative pressure is generated in the port 16 when the engine 1 is operating. Further, either positive pressure (atmospheric pressure) or intake negative pressure from the port 16 is applied to the port 17 provided in the housing 8 of the actuator 7 by the operation of the vacuum switching valve 18 described below. .

Reference numeral 18 is a vacuum switching valve (hereinafter referred to as VSV). This VSV 18 has, in its housing 19, an inlet port 21 connected to the port 16 of the engine 1 by a conduit 20 and another inlet port 22 and a port 17 of the actuator 7 opened to the atmosphere by a conduit 23. There is an outlet port 24 connected to.

Inside the housing 19, a constricted part 25 is formed.
Is provided, and the outlet port 24 is switched depending on its position so as to communicate with either the inlet port 21 or the inlet port 22. Reference numeral 27 is a spring that is interposed between the inner wall of the housing 19 and the valve body 26 in a compressed state to press the valve body 26.

A coil 28 is wound around the outer circumference of the housing 19 of the VSV 18 where a spring 27 is interposed. When the coil 28 is energized and magnetic lines of force are generated, the spring 28 is wound.
The valve body 26 is pulled against the resilience of 27. Therefore, the material of the valve body 26, the strength of the spring 27, the number of turns of the coil 28, the energizing current, etc. are appropriately set.

One end of the coil 28 is connected to one pole of a battery 30 via an air conditioner switch 29. The other end of the coil 28 and the other pole of the battery 30 are grounded to the vehicle body. An electromagnetic clutch 31 is connected in parallel with the coil 28 between the air conditioner switch 29 and the vehicle body grounding circuit. This electromagnetic clutch 31 is an output shaft (not shown) of the engine when energized.
And the drive shaft of the compressor for compressing the refrigerant of the air conditioner.

The device thus constructed has a spring 15 for pressing the diaphragm 9 in the actuator 7.
Is larger than the returning force of the spring 6 wound around the shaft 5 of the throttle valve 4 to close the throttle valve 4, and is lower than the intake negative pressure of the engine 1 acting on the diaphragm 9 of the actuator 7. Set it to be small and use it.

The operation will be described. FIG. 1 shows a state in which the engine 1 is stopped. Since the engine 1 is stopped, the air conditioner switch 29 is naturally turned off,
The coil 28 of the VSV 18 is not energized, and the valve body 26 is a spring.
The inlet port 22 for opening to the atmosphere is closed by being pushed by 27, and the outlet port 24 is in communication with the inlet port 21.
Since the engine 1 is stopped and the intake negative pressure does not act on the working chamber 10 of the actuator 7, the spring 15 pushes the diaphragm 9, and the rod 13 and the link 14 slightly open the throttle valve 4 to function as a restart mechanism. .

When the engine 1 is stopped with the throttle valve 4 opened in such a slight angle, the air indicated by the arrow 32 easily enters the engine 1 when the engine is next started. Become. Since the coil 28 of the VSV 18 is not energized, the power of the battery 30 is not wasted.

FIG. 2 shows the case where the engine 1 is operating and the air conditioner is not used, so the air conditioner switch 29 is open. Since the air conditioner switch 29 is open, VS
The V18 and the electromagnetic clutch 31 remain in the state shown in FIG. Since the intake negative pressure is generated in the port 16 when the engine 1 is operated, this intake negative pressure is applied to the pipe 20, the inlet port 21, the inside of the housing 19 of the VSV 18, and the outlet port 2.
4, the working chamber 1 of the actuator 7 via the conduit 23 and the port 17
Guided to 0.

When the intake negative pressure enters the working chamber 10, the intake negative pressure pulls the diaphragm 9 against the elastic force of the spring 15, so that the throttle valve 4 is closed via the rod 13 and the link 14. Become. The opening degree of the throttle valve 4 when closed is the idling opening degree when the air conditioner is not operating. It goes without saying that the throttle valve 4 can be arbitrarily opened from this idling opening degree by the driver's depression of the throttle pedal or the like.

While the engine 1 is operating, the air conditioner switch
FIG. 3 shows a state in which 29 is included. With the air conditioner switch 29 turned on, the VS with the electromagnetic clutch 32
Since the V18 coil 28 is also excited, the valve body 26 is a spring.
Pulled against the resilience of 27, open inlet port 22 to open to atmosphere and communicate with outlet port 24. At the same time, the inlet port 21 and the outlet port 24 are shut off.

In addition, the working chamber 10 of the actuator 7
Since the inside becomes atmospheric pressure, the diaphragm 9 is pushed by the elastic force of the spring 15, and the throttle valve 4 opens a slight angle via the rod 13 and the link 14. As a result, the idle up function when using the air conditioner can be obtained.

[0030]

The present invention is a throttle valve control device for a vehicle constructed as described above, and as a vacuum switching valve, when the coil is energized,
The valve body is pulled against the spring that presses the valve body, and this valve body is used to connect the inlet port on the atmosphere side with the outlet port. Also, a diaphragm is installed inside the housing as an actuator. To form a working chamber,
A spring that presses the diaphragm is installed in this working chamber, and the one with the base end of the rod attached to the side opposite to the working chamber of the diaphragm is used.The tip of this rod is connected to the throttle valve, and the diaphragm inside the actuator is used. The return force of the pressing spring is greater than the return force of the spring wound around the throttle valve shaft to close the throttle valve, and less than the engine intake negative pressure acting on the actuator diaphragm. Depending on the setting, the actuator
It is possible to obtain both the idle-up mechanism and the restart mechanism with a simple structure using only one.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the one shown in FIG.

FIG. 3 is an operation explanatory view showing the state of FIG. 1 different from that of FIG. 2;

[Explanation of symbols]

 1 engine 2 carburetor 4 throttle valve 5 shaft 6 spring 7 actuator 9 diaphragm 10 working chamber 13 rod 14 link 15 spring 16 port 17 port 18 VSV 21 inlet port 22 inlet port 24 outlet port 26 valve body 28 spring 28 coil 29 air conditioner switch 30 Battery 31 Electromagnetic clutch

Claims (4)

[Claims] 1. A vehicle in which a compressor for compressing a refrigerant is connected to an output shaft of an engine via an electromagnetic clutch,
A vacuum switching valve having an inlet port on the atmosphere side and a negative pressure side and an outlet port connected to one of the inlet ports by switching between these inlet ports is provided, and a coil of the vacuum switching valve is connected in parallel to the electromagnetic clutch. , The working chamber of the actuator that opens the inlet port on the atmosphere side to the atmosphere, connects the inlet port on the negative pressure side to the intake system of the engine, and acts on the outlet port to close the throttle valve when negative intake pressure acts A throttle valve control device for a vehicle, which is connected to the. 2. A vacuum switching valve,
When the coil is energized, the valve body is pulled against a spring which presses the valve body, and the valve body uses a type in which an inlet port and an outlet port on the atmosphere side communicate with each other. Item 1. A vehicle throttle valve control device according to item 1. 3. As an actuator, a diaphragm is stretched in a housing to form a working chamber, a spring for pressing the diaphragm is provided in the working chamber, and the base end of the rod is attached to the side opposite to the working chamber of the diaphragm. 2. The throttle valve control device for a vehicle according to claim 1, wherein a rod end is connected to a throttle valve. 4. An engine that exerts a return force of a spring that presses a diaphragm in an actuator is larger than a return force of a spring wound around a shaft of the throttle valve to close the throttle valve and that acts on the diaphragm of the actuator. The throttle valve control device for a vehicle according to any one of claims 1 to 3, wherein the intake negative pressure is set to be smaller than the intake negative pressure.