JPH01247721A - Control device for throttle valve of engine - Google Patents

Abstract

PURPOSE:To guarantee a comfortable operation by providing plural return springs giving a valve closing power via a differential gear device in that which links a manual operation means to the 1st motive gear of the differential gear device linked to a throttle valve shaft and a driving motor respectively. CONSTITUTION:A pair of the bevel gears 41, 42 of a differential gear device 4 are freely rotatably borne on the valve shaft 3 opening and closing a throttle valve 2. The small bevel gears 44, 45 located on the pinion shaft 43 intersected at right angles with the valve shaft 3 are bitten with these both bevel gears 41, 42. On the outer periphery of the respective bevel gear 41, 42 1st and 2nd motive gears 5, 6 are bitten. The 1st motive gear 5 is turned via a wire 11, etc. by the operation of an accel pedal 12 and the 2nd motive gear 6 is turned by the electronic control actuator 8 contg. a motor 81. In this case, plural return springs 13 and 21, 22 are provided concerning each motive gear 5, 6 and the reaction power acting on the accel pedal 12 is eliminated by the driving of the actuator 8 at traveling time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve control device that controls opening and closing of a throttle valve of a vehicle engine using an electronically controlled actuator.

[Conventional technology]

Recently, as part of engine control to improve exhaust purification performance and fuel efficiency, the mechanical connection between the throttle valve and the accelerator pedal has been eliminated, and a signal that converts the amount of accelerator depression into an electrical quantity (accelerator depression amount signal) and other Development of a throttle valve control device using an electronically controlled actuator that controls the opening and closing of a throttle valve in response to a signal (for example, an engine rotation speed signal, a gear position signal, etc.) representing an engine operating state or a vehicle running state is underway.

In the above electronically controlled actuator-based throttle valve control device, the throttle valve is opened and closed in response to commands from the vehicle control device, which includes an arithmetic control unit that sequentially calculates the optimal opening degree in response to signals representing the engine operating state or vehicle running state. Since this is done by a drive motor that is activated by the current, it is necessary to install a safety device to prevent the vehicle from running out of control even if the electronically controlled actuator becomes inoperable while the vehicle is running. Japanese Patent Publication No. 58-25853 discloses a configuration in which an electromagnetic clutch is provided to sometimes disconnect the throttle valve shaft from the motor. On the other hand, Japanese Patent Laid-Open No. 61-215436 discloses a method in which a throttle valve shaft is mechanically rotated by an electronically controlled actuator via a differential gear in response to depression of an accelerator lever.

(Problem to be Solved by the Invention) Since the conventional throttle valve control device is configured as described above, it is possible to prevent the vehicle from running out of control and to maintain running when the electronically controlled actuator becomes inoperable. There was a problem in that the vehicle could not be moved to a designated location for repairs.

Additionally, if the drive wheels slip when the vehicle starts or accelerates, the motor acts to reduce the throttle valve opening when the engine torque is reduced by reducing the throttle valve opening in opposition to the accelerator pedal operation. There was a problem in that the reaction force was transmitted to the accelerator pedal, causing discomfort to the driver operating the accelerator pedal.

This invention was made to solve the above-mentioned problems, and includes traction control that reduces the throttle valve opening in opposition to accelerator pedal operation, or throttle control during gear shifting to prevent shock when shifting automatic transmissions. The object of the present invention is to obtain a throttle valve control device for an engine suitable for a device that reduces the degree of valve opening.

[Means to solve the problem]

A throttle valve control device according to the present invention includes: a differential gear device that drives a valve shaft that opens and closes a throttle valve; an accelerator wire that rotates a first driving gear of the gear device in response to depression of an accelerator pedal; It is equipped with an electronically controlled actuator including a motor that rotates a second driving gear of a differential gear device, and a spring that applies a throttle valve in the closing direction.

[Function] In this invention, when it is necessary to reduce the throttle valve opening in opposition to the operation of the accelerator pedal, such as during traction control or shifting of an automatic transmission, the electronic control 2T is used.
This is done by driving the second driving gear by the J actuator. Further, since the throttle valve is not provided with a return spring, the reaction force transmitted to the accelerator pedal via the differential gear when driving the throttle valve can be ignored. In addition, in the unlikely event that the electronically controlled actuator fails, turn off t'a or disconnect the second driving gear from the motor using the IT electromagnetic clutch. After the throttle valve is returned to the closed position, the vehicle is driven by operating the throttle valve using only the accelerator wire, which serves as a mechanical connection to the accelerator pedal.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram of a throttle valve control device according to the present invention, where ① is an air intake pipe of an engine (not shown), 2 is a throttle valve, 3 is a valve shaft that opens and closes the throttle valve 2, and 4 is a differential gear device. Reference numerals 41 and 42 denote bevel gears, which are rotatably supported on the valve shaft 3, respectively. Bevel gear 41.42
First and second driving gears 5.6 are meshed with the outer peripheries of the respective driving gears. The valve shaft 3 is supported by the suction pipe 1, and a pinion shaft 43 is fixed orthogonally to the valve shaft 3. 44 and 45 are small bevel gears attached to the pinion shaft 43, which are similar to the above-mentioned bevel gear 41.
．． 42 and interlock with each other.

Reference numeral 7 denotes a rotating shaft fixed to the axis of the first driving gear 5. An accelerator wire 11 is wound around a groove of an accelerator lever 10 fixed to the rotating shaft 7 with a bolt 9. It is connected to the accelerator pedal 12. 13 is a return spring of the first driving gear 5;
A torque is applied to the rotating shaft 7 to return the throttle valve 2 to the closed position. 14 is a return spring for the accelerator pedal 12; 15 is a stopper for the accelerator pedal 12;
8 is an electronically controlled actuator, which is a DC drive motor 81.
, a current control circuit 83 that supplies current to this, and an electromagnetic clutch 82.

61 is a rotating shaft supported by the axis of the second driving gear 6;
An arm 62 is provided on this rotating shaft 61.

The second driving gear 6 is rotationally driven by a motor 81 via a rotating shaft 61. An electromagnetic clutch 82 is disposed between the rotating shaft 61 and the motor 81, and when the power to this clutch 82 is turned off, the motor 81 rotates. No force is transmitted to the rotating shaft 61. 16 is a throttle opening sensor that detects the opening of the throttle valve 2; 17 is a rotation angle sensor that detects the amount of rotation of the rotating shaft 61, that is, the second driving gear 6; 19 is an accelerator sensor that detects the amount of depression of the accelerator pedal 12 operated by the driver; It is a sensor that detects B).

FIG. 2 is a front view of the arm 62 taken along the line ■-■ in FIG. When rotating clockwise, the return spring 21 acts, and when rotating clockwise, the return spring 22 acts.
Both springs 21 and 22 apply a torque to the arm 62 in the direction of returning it to the set position (solid line position). 23゜2
4 is a stopper for the return springs 21 and 22.

20 is a throttle opening sensor 16 and a rotation angle sensor 17
, the accelerator sensor 18, and the sensor 19, perform predetermined arithmetic processing corresponding to these input information, and drive the motor 81 via the flow control circuit 83, as well as the electromagnetic clutch. This is an arithmetic control unit that controls turning on and off of 82.

Next, the operation will be explained. The rotational driving force of the motor 81 is transmitted to the throttle valve shaft 3 via the electromagnetic clutch 82, the second driving gear 6, the bevel gear 42, the small bevel gears 44, 45, and the pinion shaft 43. On the other hand, in response to depression of the accelerator pedal 12, driving force is applied to one bevel gear 41 of the differential gear device 4 via the accelerator wire 11, the accelerator lever 10, and the first driving gear 5. This rotational force acts on the small bevel gears 44 and 45 and is superimposed on the rotation of the bevel gear 42, which is being rotated by the electronically controlled actuator 8. Rotate in the same direction to open and close the throttle valve 2. The movement of the throttle valve 2 in response to the depression of the accelerator pedal 12 is performed in a manner superimposed on the movement by the electronically controlled actuator 8, but the speed of response immediately responds to the movement of the accelerator pedal 12. Further, when the driver's foot is removed from the accelerator pedal 12 and the vehicle is braked, the first driving gear 5 driven by the accelerator wire 11 immediately acts to close the throttle valve 2, but the motor 81 Due to the delay in tracking the second
The drive gear 6 closes the throttle valve 2 slowly. In such a case, the arithmetic control unit 20 detects the brake operation by the sensor 19, immediately turns off the electromagnetic clutch 82, and disconnects the electronically controlled actuator 8 and the second driving gear 6.
As a result, the second driving gear 6 is quickly returned to the set position of the arm 62, that is, the fully closed position of the throttle valve 2, by the return spring 21, 22 acting on the arm 62. This kind of operation is performed by the electromagnetic clutch 82.
It can also be obtained by turning off the power to the motor 81 while turning on the motor 81 and letting the motor 81 idle by the return springs 21 and 22.

By the way, if the motor 81 or the current control circuit 83 breaks down, the second driving gear 6 according to the output of the calculation side 4WJ section 20
In other words, when the output signal of the rotation angle sensor 17 detects an abnormality, the electromagnetic clutch 82 is immediately turned off, and the second driving gear 6 is returned to the fully closed position of the throttle valve 2 to prevent the vehicle from running out of control. . And the electromagnetic clutch 82
After turning off, the first driving gear 5 is connected by the accelerator wire 11.
The vehicle is driven by directly driving only the accelerator pedal 12 with the accelerator pedal 12.

On the other hand, when it is necessary to reduce the opening of the throttle valve in opposition to the operation of the accelerator pedal 12, such as during trax run control or shifting of an automatic transmission, the electronically controlled actuator 8 drives the second driving gear 6 in the reverse direction. As a result,
The opening degree of the throttle valve 2, which is opened via the first driving gear 5 by operating the accelerator pedal 12, is reduced through the small bevel gears 44 and 45 by the reverse drive of the second driving gear 6. At this time, the force for opening and closing the throttle valve 2 only needs to be small enough to overcome the bearing friction of the valve shaft 3. Therefore, when the small bevel gears 44 and 45 are driven in reverse by one bevel gear 42, the other bevel gear The reaction force that 41 receives is very small, and the operating force of the accelerator pedal 12 (the force that drives the first driving gear 5 against the return springs 13 and 14) is large compared to this reaction force. is transmitted to the accelerator pedal 12 via the first driving gear 5 and the accelerator wire 11, so that the driver operating the accelerator pedal 12 does not feel uncomfortable.

〔Effect of the invention〕

As explained above, according to the present invention, the valve shaft for opening and closing the throttle valve is driven by the output shaft of the differential gear device, the first driving gear of this gear device is interlocked with the accelerator pedal, and the second driving gear is connected to the accelerator pedal. The gear is interlocked with an electronically controlled actuator including a motor, and a return spring that applies a force to close the throttle valve is distributed and distributed as a return spring for the first and second driving gears via a differential gear device. Therefore, while the vehicle is running, the reaction force on the accelerator pedal due to the drive of the electronically controlled actuator is eliminated, allowing comfortable driving. Furthermore, even if the electronic control actuator fails, the vehicle will not run out of control or become unable to run, resulting in a highly safe and reliable throttle valve control device.

[Brief explanation of the drawing]

FIG. 1 is a front view of a throttle ring according to an embodiment of the present invention. 2... Throttle valve, 3... Valve shaft, 4... Differential gear device, 5... First driving gear, 6... Second driving gear, 8... Electronically controlled actuator , 11... accelerator wire, 12... accelerator pedal, 13...
Return spring of first driving gear, 16... Throttle opening sensor, 17... Rotation angle sensor, 18.
...Accelerator sensor, 19...Sensor, 20...Arithmetic control section, 21.22...Return spring of second driving gear, 81...Motor, 82...Electromagnetic clutch. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masu Oiwa)-15

Claims (1)

[Claims] A valve shaft that opens and closes a throttle valve that varies engine output;
A differential gear device provided to drive this valve shaft with its output shaft, and a mechanical coupling means for rotationally driving a first driving gear of this gear device in response to depression of an accelerator pedal. , a throttle valve control device including an electronically controlled actuator including a drive motor for rotationally driving a second driving gear of the differential gear device, which applies a force to close the throttle valve via the differential gear device. A throttle valve control device for an engine characterized by comprising a plurality of springs.