JPH05202773A - Speed control device of internal combustion engine - Google Patents

Abstract

PURPOSE:To achieve miniaturization and simplification of an engagement mechanism to release the speed regulation of an internal combustion engine, and surely reduce the speed due to the release of a mechanical engagement mechanism with high reliability when an abnormality is generated in the cruise control mode. CONSTITUTION:A solenoid 48 and an ultrasonic motor 6 are actuated in the cruise control mode, and a notch 44 in engagement with a groove 43 of a mechanical guard link 42 is pushed out to the opening side of a throttle valve. This allows the regulation of the opening of the throttle valve due to a maximum opening regulating part 23 to be released, and controls the opening of the throttle valve 3 by the motor 26. When a breakdown happens to the electric system in the cruise control mode, excitation to the solenoid 48 is stopped, a solenoid bar 45 is shifted in the radially outward direction as indicated by the arrow (A), and the engagement of the groove 43 with the notch 44 is released by the energizing force of a tension spring 47. Then, the acceleration lever 4 returns the throttle valve 3 to the closing side by the tension spring 7, preventing the overspeed of the internal combustion engine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed control device for an internal combustion engine, such as a throttle valve control device for adjusting the intake air amount of a gasoline engine and a fuel injection pump accelerator for adjusting the fuel injection amount of a diesel engine. It is applied to lever opening control devices.

[0002]

2. Description of the Related Art Conventionally, as a throttle valve control device for adjusting the intake air amount of an internal combustion engine, a throttle valve control device for both an accelerator operation system operated by a driver and an electric operation system driven by the control device is used. It is known that the opening can be adjusted. For example, during normal traveling, the opening degree of the throttle valve is adjusted by the accelerator operation system, and during traveling at a constant vehicle speed, the opening degree of the throttle valve is adjusted by the electric operation system.

[0003]

According to such a conventional throttle valve control device, when the opening degree of the throttle valve is cruise-controlled (vehicle speed control) by the electric operation system without being restricted by the operation amount of the accelerator lever. A separate actuator is required to release the throttle opening regulation member, which complicates the structure. Further, when the motor is over-rotated, it is necessary to provide a clutch for cutting off the drive of the throttle valve by the motor, which causes a problem that the structure becomes complicated.

The problem to be solved by the present invention is that the actuator for releasing the speed regulation of the adjusting member for adjusting the rotation speed of the internal combustion engine is downsized with a relatively simple structure, and the rotation speed is generated when an abnormality occurs during cruise control. An object of the present invention is to provide a rotation speed control device for an internal combustion engine, which is configured to decelerate the engine.

[0005]

SUMMARY OF THE INVENTION An internal combustion engine rotation speed control apparatus according to the present invention for solving the above problems is an accelerator operated by a driver to adjust the operation amount of an adjusting member for adjusting the rotation speed of the internal combustion engine. In an internal-combustion-engine rotation speed control device that is adjustable by both an operation system and an electric operation system driven by a control device, an adjustment member for adjusting the rotation speed of the internal combustion engine and the adjustment member are attached in an opening direction. A first biasing unit that biases the first biasing unit and a member that moves in the opening direction together with the adjusting member to restrict the opening limit of the adjusting member in the opening direction, and a restricting member having a protrusion on the outer peripheral portion, and the restricting member. A second urging means for urging a member in the closing direction of the adjusting member; and a locking portion for releasing the regulating member in the opening direction and locking it in the closing direction, and engaging the protrusion with the engaging member. Solution by moving the stop outward Possible locking member, driving means for driving the locking member, and moving the restricting member in the opening direction by engaging the locking member with the projection, the projection of the restricting member and the locking An electromagnetic solenoid capable of switching a relationship between the member and the locking portion into an engaged state or a released state.

[0006]

According to the rotation speed control device of the present invention, at the time of cruise control, a restricting member having a projection for driving the locking member by actuating the actuator as well as energizing the electromagnetic solenoid and engaging with the locking portion of the locking member is provided. Rotate in the opening direction of the adjustment member. As a result, the regulation of the rotation speed by the regulation member is released, and the adjustment amount of the adjustment member is controlled by the electric operation system.

If any failure occurs in the electric operation system during the cruise control, the power supply to the electromagnetic solenoid is cut off. Then, the engagement between the protrusion of the regulation member and the locking portion of the locking member is released by the electromagnetic attraction force, the regulation member is closed by the second urging means, and the adjustment member is returned to the closed side. This prevents excessive rotation of the internal combustion engine.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment in which the present invention is applied to a throttle valve control device for an internal combustion engine. As shown in FIG. 1, a throttle valve control device 1 for an internal combustion engine includes an accelerator pedal 2,
Throttle valve 3, accelerator lever 4, electric drive device 5, actuator 6, and tension springs 7, 8, 9
Equipped with.

The accelerator pedal 2 is arranged in the passenger compartment of a passenger vehicle, and the accelerator lever 4 is arranged according to the amount of depression of the driver.
Change the rotation position of. The throttle valve 3 is arranged in a throttle body forming an intake passage of the internal combustion engine,
It is fixed by a screw or the like to a shaft 16 rotatably supported by the throttle body via bearings 14 and 15. Further, at one end of the shaft 16, an annular first valve lever 19 having a locked plate 22 on the outer periphery is provided.
Is fixed, and the second valve lever 20 having the locked plate 34 on the outer periphery is fixed to the other end.

The accelerator lever 4 is rotatably attached to one end of a shaft 16 and has an end portion of a wire 21 mechanically connected to the accelerator pedal 2 fixed to the outer peripheral portion. Further, the maximum opening regulating portion 23 for locking the locked plate 22 of the first valve lever 19 is provided on the side portion of the accelerator lever 4.
Is provided. By locking the locked plate 22 of the first valve lever 19 to the maximum opening restriction portion 23, the throttle valve 3 is prevented from opening beyond the maximum opening corresponding to the depression amount of the accelerator pedal 2.

The electric drive unit 5 comprises a motor 26, a sector gear 27 and an accelerator opening sensor 28. The motor 26 rotates the pinion gear 30 to a target rotation angle according to the throttle valve opening signal to open the throttle valve 3 to the target opening. The outer periphery of the sector gear 27 meshes with the pinion gear 30, and is rotatably assembled to the other end of the shaft 16. Also sector gear 27
A locking plate 32 is fixed to the throttle valve 3 side so as to project in the axial direction of the shaft 16. This locking plate 3
2 is locked to the locked plate 34 of the second valve lever 20 to prevent the throttle valve 3 from opening more than the maximum opening corresponding to the target opening of the motor 26. The accelerator opening sensor 28 detects the depression amount of the accelerator pedal 2, and sends a throttle valve opening signal corresponding to the detected value to the motor 26 via a control unit (ECU) 36 (not shown).

Ultrasonic motor 6 as an actuator
Moves the position of the maximum opening degree regulating portion 23 of the throttle valve 3 in the valve opening direction or the valve closing direction. The ultrasonic motor 6 is
The mechanical guard disc 41 can be moved within the opening range of the throttle valve 3. The mechanical guard link 4 is provided around the pin 46 fixed to the side wall surface of the throttle valve of the mechanical guard disc 41.
2 is rotatably attached. One end 42a of the arc-shaped mechanical guard link 42 is rotatably attached around the pin 46, and the other end 42b is pulled outward in the radial direction of the arrow A. The notch 44 of the accelerator lever 4 can be engaged with the groove 43 formed in the inner wall near the other end of the mechanical guard link 42. One end of the tension spring 47 is locked to the other end 42b of the mechanical guard link 42, and the other end is locked to the radially outward protruding portion 41a of the mechanical guard disc 41. As shown in FIG. 1, the solenoid bar 45 protrudes radially inward when energized, and the mechanical guard link 42
Of the mechanical guard link 42 is pressed to prevent the mechanical guard link 42 from expanding radially outward.

When the groove 43 of the mechanical guard link 42 and the notch 44 of the accelerator lever 4 are engaged with each other when the solenoid 48 is energized, the ultrasonic motor 6 causes the accelerator lever 4 to move.
Can be moved in the opening direction. Ultrasonic motor 6
Irrespective of the operating state of the accelerator pedal 2,
The accelerator lever 4 is rotated in the valve opening direction by a desired rotation angle in response to the command of 6. Therefore, it becomes possible to open the throttle valve 3 by the motor 26 in a state where the accelerator pedal 2 is released as in the case of an automatic drive. When the solenoid 48 is not energized, the solenoid bar 45 moves in the direction of arrow A, and the urging force of the tension spring 47 causes the other end 42b of the mechanical guard link 42 to move radially outward from the position in FIG. As a result, the groove 43 of the mechanical guard link 42 and the notch 44 of the accelerator lever 4 are disengaged from each other. Then, the tension spring 7 causes the accelerator lever 4 to rotate to the closing side.

Turning on / off the switch 50 provided in conjunction with the brake pedal 51 switches the operation of the ultrasonic motor 6 or the solenoid 48 via the ECU 36. For example, when some trouble occurs in the ECU or the motor 26 during cruise control, the brake pedal 51 is depressed to cut off the power supply to the ultrasonic motor 6 and the power supply to the solenoid 48.

The tension spring 7 has one end locked to the accelerator lever 4 and the other end locked to the throttle body.
The accelerator lever 4 is urged in the closing direction of the throttle valve 3. The tension spring 8 has a first valve lever 19 at one end.
Is locked to the locked plate 22 and the other end is locked to the throttle body to urge the throttle valve 3 in the opening direction. Here, the biasing force of the tension spring 7 is set to a value larger than the biasing force of the tension spring 8.

The tension spring 9 has one end locked to the throttle body and the other end locked to the locking plate 32 of the sector gear 27 to urge the sector gear 27 in the opening direction of the throttle valve 3. The urging force is set to be larger than the force required to rotate the motor 26 in the opening direction when the motor 26 is not energized. The tension spring 9 is set to keep the motor 26 rotating in the opening direction so as not to hinder the operation of the throttle valve 3 by the accelerator lever 4 when the power supply to the motor 26 is stopped due to some failure. The tension spring 9 is provided because, if a biasing force corresponding to the tension spring 9 is added to the tension spring 8, it is necessary to increase the biasing force corresponding to the added biasing force to the tension spring 7. This is because the pedaling force of the accelerator pedal 2 increases excessively. That is, by providing the tension spring 9, the biasing force of the accelerator pedal 2 is reduced.

An accelerator lever opening sensor (not shown) detects the opening of the accelerator lever 4 having the maximum opening restricting portion 23 of the throttle valve 3 and outputs an opening signal of the accelerator lever 4 according to the detected value. It is sent to the ECU 36 (not shown). Next, the operation of this throttle valve control device will be described. When the accelerator pedal 2 is depressed by the driver, the accelerator lever 4 mechanically connected by the wire 21 rotates in the opening direction by a rotation angle corresponding to the depression amount of the accelerator pedal 2. Then, the rotation angle of the accelerator lever 4, that is, the depression amount of the accelerator pedal 2 is detected by the accelerator opening sensor 28, and a throttle valve opening signal corresponding to the depression amount of the accelerator pedal 2 is output to the motor 26 via the ECU. To be done. Then, the pinion gear 30 of the motor 26 and the sector gear 27 meshing with the pinion gear 30 rotate by the target rotation angle. At this time, the second valve lever 20 is pressed against the locking plate 32 fixed to the sector gear 27 by the urging force of the tension spring 8, so that the second valve lever 20 is displaced by the displacement angle of the sector gear 27.
Rotates, and the throttle valve 3 fixed to the shaft 16 is opened to the target opening.

On the contrary, when the accelerator pedal 2 is returned, the accelerator lever 4 is returned by the urging force of the tension spring 7 in the closing direction of the throttle valve 3 by the rotation angle corresponding to the returning amount of the accelerator pedal 2. At this time, the accelerator opening sensor 28 detects the return amount of the accelerator pedal 2, and the EC
A throttle valve opening signal corresponding to the return amount of the accelerator pedal 2 is output to the motor 26 via U36. And
The pinion gear 30 of the motor 26 and the sector gear 27 meshing with the pinion gear 30 rotate by the target rotation angle,
The locking plate 32 fixed to rotate the locked plate 34 of the second valve lever 20 by the rotation amount corresponding to the returning amount of the accelerator pedal 2.

When some failure occurs in the motor 26 or the ECU 36, the urging force of the tension spring 7 is set to a value larger than the urging force of the tension spring 8. Therefore, the maximum opening regulating portion 23 of the accelerator lever 4 is set. Is the first
Even if the locked plate 22 of the valve lever 19 is locked and the motor 26 tries to increase the opening degree, the second valve lever 34 and the locked plate 32 are separated from each other, so that the throttle pedal is depressed more than the depression amount of the accelerator pedal 2. The valve 3 is never opened. This prevents the internal combustion engine from over rotating. At this time, the energization of the motor 26 is cut off, and the tension spring 9 rotates the sector gear 27 to the open side, whereby the control by the accelerator lever 4 becomes possible. That is, the locked plate 22 of the first valve lever 19 is pressed against the maximum opening regulating portion 23 by the urging force of the tension spring 8, and the first valve lever 19 and the accelerator lever 4 rotate together, so that the throttle valve Reference numeral 3 rotates in response to movement of the accelerator pedal 2.

During cruise control, the throttle valve 3 is opened to a larger opening than the depression amount of the accelerator pedal 2.
That is, when a cruise button (not shown) is pressed, the ultrasonic motor 6 is energized, the drive force of the ultrasonic motor 6 causes the mechanical guard disc 41 to rotate in the opening direction of the throttle valve 3, and the accelerator lever 4 depresses the accelerator pedal 2. Open larger than the opening corresponding to the amount.

If any failure occurs in the ECU or the motor 26 during the cruise control, the brake pedal 51 is depressed to cut off the power supply to the ultrasonic motor 6 and the power supply to the solenoid 48. Then, the electromagnetic attraction force moves the solenoid bar 45 in the arrow A direction, and the urging force of the tension spring 47 pulls the guide lever link 42 in the A direction. Therefore, the notch 44
Goes out of the groove 43, the accelerator lever 4 is pulled in the closing direction of the throttle valve 3 by the urging force of the tension spring 7, and returns to the throttle valve closing side to close the throttle valve 3. This prevents excessive rotation of the internal combustion engine.

The present invention can be applied to a control lever of a fuel injection pump for adjusting the fuel injection amount of a diesel engine, etc., in addition to the above-described internal combustion engine throttle valve opening adjustment device.

[0023]

As described above, according to the rotational speed control device for an internal combustion engine of the present invention, the engagement mechanism for releasing the rotational speed restriction of the internal combustion engine during cruise control can be made compact and simple. There is an effect. Also,
If an abnormality occurs in the electric operation system such as the motor or the ECU during cruise control, the restriction member is activated by the disengagement of the engagement mechanism to reduce the rotation speed.
This has the effect of preventing over-revving of the internal combustion engine and ensuring safety.

[Brief description of drawings]

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

[Explanation of symbols]

 2 accelerator pedal 3 throttle valve (adjusting member) 4 accelerator lever (accelerator operating system) 6 ultrasonic motor (driving means) 7 tension spring (second urging means) 8 tension spring (first urging means) 19 first valve Lever (member) 20 Second valve lever (member) 23 Maximum opening regulation part (regulation member) 26 Motor (electric operation system) 36 ECU (control device) 41 Mechanical guard disc (locking member) 42 Mechanical guard link (engagement) Stop member) 43 Groove (locking member) 44 Notch (protrusion) 45 Solenoid bar (electromagnetic solenoid) 48 Solenoid (electromagnetic solenoid)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F02D 45/00 345 F 7536-3G

Claims (1)

[Claims] 1. An internal combustion engine in which an operation amount of an adjusting member for adjusting a rotation speed of the internal combustion engine can be adjusted by both an accelerator operation system operated by a driver and an electric operation system driven by a control device. In the rotational speed control device, the adjusting member for adjusting the rotational speed of the internal combustion engine, the first urging means for urging the adjusting member in the opening direction, and the member moving in the opening direction together with the adjusting member are engaged. ,
A restriction member that restricts the opening direction limit opening of the adjustment member and has a protrusion on the outer peripheral portion, a second biasing unit that biases the restriction member in the closing direction of the adjustment member, and opens the restriction member. A locking member that has a locking portion that releases in the direction and locks in the closing direction, and that is capable of releasing the engagement with the protrusion by diametrically outward movement of the locking portion; and driving the locking member. Then, the relationship between the drive means for moving the restriction member in the opening direction by the engagement of the locking member and the projection, and the relationship between the projection of the restriction member and the locking portion of the locking member is in an engaged state. Alternatively, a rotation speed control device for an internal combustion engine, comprising: an electromagnetic solenoid that can be switched to a released state.