JPS63201335A - Throttle valve control device - Google Patents

Abstract

PURPOSE:To miniaturize a throttle actuator and improve responsiveness by carrying out an action to which a return spring function is added by means of an accelerator pedal and a diaphragm actuator when said throttle actuator is in failure. CONSTITUTION:The whole device consists of a throttle body part 1, a diaphragm actuator part 2, and a control unit part 3. In this case, when a motor 17 as a throttle actuator fails, a three-way valve solenoid 25 is electrified by means of a control unit 31 to communicate a pressure chamber 21 to a pressure accumulating chamber 24. And, by making the pressure chamber 21 negative pressure, a diaphragm 22 is pulled by a return wire 13, and a first lever 12c is rotated and brought into contact with a contact pin 12e, to press a pulley 12a in a totally closed direction. Thereby, a second lever 12d and the first lever 12c are brought close to each other, enabling the operation of the throttle valve 12b by means of an accelerator wire 14.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a throttle valve control device, particularly a throttle valve υ control that enables continued running even in the event of a failure in the throttle valve drive motor. Regarding equipment.

(Prior Art) The throttle valve control device is an important device for city operation, and it is necessary to ensure a minimum amount of movement even in the event of a failure of the drive motor. Therefore, various proposals have been made to mechanically transmit the movement of the accelerator pedal to the throttle shaft even in the case of control by an electronic control device.

As one of this kind, for example, v1 Kaisho 59-12
There is one described in No. 2742.

(Problems to be Solved by the Invention) The above-described conventional device is configured to apply a return spring force in the direction in which the throttle valve always completes one circuit.

Therefore, when the throttle valve drive motor is normal, the minimum movement cannot be secured unless there is enough force to overcome the force of this return spring, and the load placed on the actuator is therefore large. the result,
The actuator was also large.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a throttle valve control device that is free from the influence of a return spring when operating a drive motor, allows the motor to be made smaller, and has high responsiveness. It is said that

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a control L valve for the thrower I/le valve 12b.
The throttle actuator 17, which is driven using the output from the throttle unit 31, and the diaphragm actuator section 2 are used together to operate the throttle actuator 1 to the throttle actuator 1.
When a failure is detected in step 7, the diaphragm actuator is driven as f1, and the accelerator pedal 40 is configured to mechanically control opening and closing of the throttle pulp.

(Function) Since there is normally no operating force from the Gui A7 flam actuator section 2, the mechanical operating force from the accelerator pedal 40 is applied to the pulley 12 integrated with the throttle valve 12b.
Not transmitted to a.

Here, when there is an operating force from the diaphragm actuator section 2 due to failure detection, the first lever 12C rotates clockwise and presses the contact pin 12e clockwise, so that the operating force from the accelerator pedal 40 is applied to the second lever 12C. The contact pin 12e is contacted via the lever 12d, and the mechanical throttle valve 12b can be operated.

(Example) Embodiments will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a throttle valve control device according to the present invention.

The throttle valve control S device in Figure 1 consists of a part of the throttle body and a diaphragm actuator part. and control unit parts.

A throttle body 11 is provided within a portion of the throttle body, and the throttle body includes a throttle shaft 12, a pulley 12a that rotates around the throttle shaft 12, and a throttle that rotates integrally with the pulley. I. Le Valve 12b etc. 12C is a first lever rotatably attached to the throttle shaft 12, and one end thereof is connected to the diaphragm 22 of the pressure chamber 21 in the diaphragm actuator section 2 via a return wire 1713. 12d is a second lever, which, like the first lever 12c, is connected to the throttle shaft 12.
is rotatably attached to the accelerator wire 14 at one end.
It is connected to the accelerator pedal 40 via.

15 and 16 are springs for each of the first and second levers 12c and 12d. 11 is a drive motor;
A pulley 18 provided on the heptad and a pulley 12a in the throttle body are connected by a belt 19, and a motor 17 controls the rotation of the throttle valve 12b.

In addition, 120 is a contact bin, and the pulley 12a
provided on the surface of

-L&l! As is clear from the configuration, the throttle valve 12b rotates together with the pulley 12a due to the rotation of the motor 17, while the first lever 12C1 and the second lever 12
d are normally in a tensioned position by springs 15 and 16, respectively.

It is rotatable with respect to the throttle shaft 12, and there is an angle of θ1 between the first lever 12C and the contact pin 12e, and the second lever 12d has an angle of 02 between the first lever 12C and the contact pin 12e.

Note that an enlarged view of the throttle shaft portion is shown in FIG. 2. The diaphragm actuator section Z is provided with the already mentioned pressure chamber 21, a pressure accumulation chamber 24 communicating with the inside of the manifold via the check valve 23, and a three-way valve solenoid 25. 2G is a diaphragm spring.

The three-way valve solenoid 25 has a first position in which the pressure chamber 21 is communicated with the atmosphere and a first position in which the communication with the pressure accumulation chamber 24 is cut off, and a first position in which the pressure chamber 21 and the pressure accumulation chamber 24 are communicated with each other and in which the communication with the atmosphere is interrupted. and a second position where the pressure chamber 21 is cut off.
It can be switched to the third store which shuts off everything between the pressure accumulator 24 and the atmosphere.

The control unit components include a control unit 31. 41 is an accelerator position sensor, and 42 is a throttle valve position sensor.

Next, the operation will be explained.

During normal operation, the three-way valve solenoid 25 is not energized, so the pressure chamber 21 is open to the atmosphere.

In this state, the first lever 12c is pulled by the spring 15.

Immediately, the first lever 12C is in the stopped position, rotating in the opposite direction around the throttle shaft 12.

The rotation of the throttle valve 12b is controlled by transmitting the rotation of the motor 11 through a belt 19.

Note that when the throttle shaft rotates in the anti-Tokita direction, the throttle valve moves in the opening direction.

Here, for the control:l unit 31, the amount of depression of the accelerator pedal 40 is determined by the accelerator position sensor 4.
The throttle valve opening degree is inputted via the throttle valve position sensor 1 and 42, and other engine conditions are also inputted respectively, and the throttle valve opening is controlled so that the throttle valve rM+x corresponds to the engine condition. ing.

Here, the relationship between the amount of depression of the accelerator pedal and the opening degree of the throttle valve will be explained using FIG.

Figure 4 shows accelerator pedal depression on the horizontal axis.
As can be seen from the figure, the throttle valve opening is within the shaded range (the range surrounded by 1-6-4-7).
11. At the roll unit 31. IJ is under control. In this case, there is an angle θ2 between the second lever 12d moved by the accelerator pedal 40 and the contact bin 12e.

Therefore, even if the depression of the accelerator pedal is transmitted through the 7th torque line ψ14 and rotates the second lever 12d, the resulting throttle valve opening curve μ becomes 0-2-3 in Fig. 4. 1 by the control unit - does not intersect with the control range, therefore the actual control is from the control unit.

That is, although the depression of the accelerator pedal 40 causes the second lever 12d to be operated via the accelerator wire 14, the operation of the second lever 12d does not control the throttle control in any way, and is actually caused by the depression of the accelerator pedal. The amount is converted into electricity m by the accelerator position sensor 41, and further inputted to the controller 1-31 along with other operating conditions, and the subtracted result is set to 5 and the controller 17 operates. As a result, the throttle I-R is controlled to the optimum value.

Further, if the Tanabata is composed of a stepping motor, the accelerator position sensor 41 is not necessarily necessary. In that case, the throttle opening is 1-.

- You can use the value expressed within the unit.

Next, when a failure of the motor 17 is detected, the control unit I.31 stops energizing the motor and energizes the three-way valve solenoid 25 to assume the second position.

That is, the pressure chamber 21 and the pressure accumulation chamber 24 are communicated with each other, and the connection with the atmosphere is cut off. In this case, manifold negative pressure is always stored in the pressure accumulation chamber 24, and therefore the three-way valve solenoid 25
The pressure chamber 21 is made negative pressure in accordance with the energization. Due to this negative and positive force, the diaphragm 22 is connected to the diaphragm spring 26.
, overcomes the spring 15 and pulls the return wire 13 to the right (towards the diaphragm). Accordingly, the first lever 12c is rotated in the direction 1, and when it has rotated to a preset angle θ, it comes into contact with the contact pin 12c, and the pulley 12a is integrated with the contact pin 120.
Push in the fully open direction. In this case, the first lever 12c rotates clockwise, becomes integrated with the contact pin 12e, and then rotates further to the position 12c' (Fig. 2).
Therefore, the second lever 12d and the first lever 12c approach each other with the contact pin 12e' in between, and in this state, operation using the accelerator wire 14 is possible.

That is, as clearly shown in FIG.
When you operate the second lever 1 against the spring 1G
2d can be rotated counterclockwise, the second lever 12d rotates the contact pin 12e', so that the first lever 12c' is in contact with the contact pin 12e'.
This is because it can be rotated.

This throttle valve control by the accelerator pedal 40 is performed against the negative pressure in the pressure chamber. Therefore, this situation
IAvI is equipped with a three-way valve solenoid 25 to the extent that the diaphragm actuator can be used as an air spring.
Just do all.

In short, the diaphragm actuator functions as a return spring for the throttle valve that is pushed by the accelerator pedal and moves in the opening direction.

In this case, the accelerator pedal and the throttle valve rM degree have a 1-2-3 relationship as shown in FIG.

FIG. 3 shows another embodiment of the return wire section, and the first
A spring type joint 50 is provided between the lever 12c and the diaphragm.

Therefore, in the case of this embodiment, a spring type joint operates as the return spring of the throttle valve. In this case, there is no need to adjust the three-way valve solenoid.

[Effects of the Invention] As explained above, according to the present invention, the [111 control of the throttle valve during normal operation is performed regardless of the return spring function, and when the drive motor is abnormal, the mechanical operation by the accelerator pedal and the diaphragm control are performed independently of the return spring function. Since the actuator operates with a return spring function, the motor load can be reduced, and miniaturization and high-speed response can be achieved.

Furthermore, in the event of a motor failure, movement is possible, albeit at a minimum.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of one embodiment of the throttle valve til control device according to the present invention, FIG. 2 is an enlarged view of the throttle shaft section, and FIG. 3 is a diagram of another embodiment of the return wire section.
FIG. 4 is a diagram showing the relationship between the accelerator pedal depression amount and the throttle valve opening degree. 1... Throttle body part 2... Diaphragm actuator part... Control unit part 11... Throttle body 12... Throttle switch A7) 1 to 12a, 18...
Pulley 12b...Throttle valve 12c...First lever 12d...Second lever 12e...Contact bin 13...Return wire 14...Accelerator w~') 15.16... Spring 17...Motor 19...Belt 21...Pressure chamber 22...Diaphragm 23...Check valve 24...Accumulator chamber 25...3-way valve solenoid 26...Diaphragm spring 31. ...Control unit 40...Accelerator pedal

Claims (4)

[Claims] (1) A control device that calculates a throttle opening degree suitable for the operating state of the engine according to the amount of depression of the accelerator pedal, a throttle actuator that controls opening and closing of a throttle valve based on the calculation result from the control device, and A throttle valve control device comprising a diaphragm actuator for controlling the opening and closing of a valve, characterized in that when a failure of the throttle actuator is detected, mechanical opening and closing control of the throttle valve by an accelerator pedal is enabled on the condition that the diaphragm actuator is driven. Throttle valve control device. (2) The slot valve control device according to claim 1, wherein the diaphragm actuator is a source of a force in the closing direction of the throttle valve. (3) The throttle valve control device according to claim 1, further comprising a function as a return spring by controlling the pressure in a pressure chamber provided in the diaphragm actuator. (4) The throttle valve control device according to claim 1 or 2, characterized in that a spring type joint is interposed in the return wire that transmits the operating force from the diaphragm actuator.