JPS6355332A - Throttle valve controller - Google Patents

Abstract

PURPOSE:To prevent runaway of a vehicle even upon malfunction of an electronic control actuator, by coupling a throttle valve shaft, a motor and an acceleration wire through a differential gear. CONSTITUTION:A differential gear 10 is coupled through a gear 4 to the valve shaft 3 of a throttle valve 2. Driving force is transmitted from a motor 27 and an acceleration wire 24 through first drive gear 15 to one end of the differential gear 10. An electronic control actuator 29 containing a D.C. motor 30 is coupled to the other end of the differential gear 10. Consequently, the motion of the throttle valve 2 corresponding to the stepping of an acceleration pedal 5 is lapped over the motion caused by the electronic control actuator 29, but responds instantaneously to the motion of the acceleration pedal 5. When the actuator 29 is disabled, the throttle valve 2 can be driven directly by the acceleration wire 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve control device, and more particularly to a device for controlling a throttle valve of a vehicle engine using an electronically controlled actuator.

[Conventional technology]

Recently, as part of engine control aimed at improving exhaust purification performance and fuel efficiency, the mechanical connection between the throttle valve and the accelerator pedal has been eliminated, and a signal (accelerator depression amount signal) that converts the amount of accelerator depression into an electric quantity is used to communicate with other engines. A signal indicating the operating state or vehicle running state (e.g. engine speed signal,
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 gear shift signal, etc. is underway.

In this electronically controlled actuator-based throttle valve control device, the opening and closing of the throttle valve is controlled by a vehicle control device comprising a calculation control section that sequentially calculates the optimum opening degree in response to signals representing engine operating conditions or vehicle running conditions. Because it is carried out by a drive motor that operates in response to commands,
It is necessary to provide 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. Examples of such safety devices include: (1) A return mechanism that returns the throttle valve to the closed position when the control is stopped. A configuration in which a spring is attached to the throttle valve shaft, (2) a configuration in which an electromagnetic clutch is installed to disconnect the throttle valve shaft from the electronically controlled actuator when control becomes uncontrollable, and (3) an electromagnetic clutch that combines a return spring and an electromagnetic clutch. JP-A-55-145867 discloses a configuration in which a return spring is applied when the clutch is disengaged.

[Problem that the invention seeks to solve]

However, in these conventional examples, if the electronically controlled actuator becomes inoperable, although it is possible to prevent the vehicle from running out of control, it is not possible to maintain the vehicle running, and it is also impossible to move the vehicle to a predetermined location for repairs. There was a problem with it disappearing.

It is an object of the present invention to solve the conventional problems of ensuring safe running of a vehicle without fear of runaway even when an electronically controlled actuator becomes uncontrollable, and at the same time to achieve high-speed response. An object of the present invention is to provide an excellent throttle valve control device.

[Means for solving problems]

The throttle valve control device of the present invention includes a valve shaft that opens and closes a throttle valve that varies the output of an engine, a differential gear device that drives the valve shaft with an output shaft, and a first driving force that meshes with the differential gear device. an electric device capable of rotationally driving a gear, a mechanical coupling means for rotationally driving a first driving gear in response to depression of an accelerator pedal via the electric device, and a first drive gear meshing with a differential gear device; It is composed of an electronically controlled actuator having a drive motor for rotationally driving the drive gear No. 2, an opening sensor that detects the opening of the throttle valve, and an accelerator sensor that detects the amount of depression of the accelerator pedal.

[Effect]

According to the throttle valve control device of the present invention, the first driving gear meshing with the differential gear is directly rotationally driven by the connecting means from the accelerator pedal, and the throttle valve moves quickly in response to rapid movement of the accelerator pedal. . Opening/closing control to a target throttle opening instructed by the arithmetic control section is performed by an electronically controlled actuator via a second driving gear. If the electronically controlled actuator fails and the opening/closing operation of the throttle valve becomes impossible, the first driving gear is driven by the electric device to open/close the throttle valve.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the throttle valve control device for a vehicle engine according to the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a throttle valve control device according to an embodiment of the present invention. This throttle valve control device includes a differential gear device lO. The differential gear device 10 includes a bearing 11
, 11, and bevel gears 13, 14 are rotatably mounted on both ends of the shaft 12. These bevel gears 13, 14 are also provided with teeth on their outer peripheries, and these teeth are provided with teeth for the first and second drive gears 15, 16, which have the same rotation center axis.
are interlocking with each other.

In the intermediate part between the two bevel gears 13.14 mounted on the shaft 12, a pinion shaft 17 is attached to the shaft 12.
It is installed through the This g-nion shaft 17 has a small bevel gear 18, which is a differential gear, on both sides of the shaft 12.
19 is installed. These small bevel gears 18, 19 mesh with the aforementioned bevel gears 13, 14, respectively. Furthermore, large gears 20 are attached to both ends of the pinion shaft 17 so as to be rotatable about the axis of the shaft 12 . This large gear 20
is the valve shaft 3 of the throttle valve 2 arranged in the air intake pipe 1
It meshes with a gear 4 fixed to.

The first driving gear 15 is rotatably supported on one end of a rotating shaft 21, and a segment-shaped disk 22 is provided at the other end of the rotating shaft 21. It is fixed by a seat 23.

A groove is formed in the curved surface of this disc 22, and an accelerator wire 24 is hung in the groove, and the wire 24 is connected to the accelerator pedal 5. A spiral return ring 25 is attached to the rotating shaft 21 to apply tension to the accelerator wire 24.
5 applies torque to the rotating shaft 21 in the direction of returning the throttle valve 1 to the closed position.

Further, an arm 26 is fixed to the one-rotation shaft 21, and an electric motor 27 is fixed to this arm 26. A small gear 28 attached to the output shaft of the electric motor 27 meshes with the first drive gear 15. Note that 6 indicates the return speed of the accelerator pedal 5, and 7 indicates the release of the accelerator pedal 5.

The electronically controlled actuator 29 is a direct current drive motor 30
and a current control circuit 31 that supplies current thereto. Further, an opening sensor 32 made of, for example, a potentiometer is attached to the valve shaft 3 to detect the opening of the throttle valve 2, and an output signal H of the opening sensor 32 is input to a current control circuit 31. The arithmetic control unit 33 includes a sensor 34 that detects the operating state of the engine (for example, the rotational speed N) and the running state of the vehicle (for example, the vehicle speed V), and an accelerator sensor that detects the amount of depression of the accelerator operated by the driver (the pedal 5). f'35 is input, predetermined arithmetic processing is performed on the values of these input signals, and the target opening Ht of the throttle valve 2 is output.The target opening Ht of the throttle valve 2 is The instruction signal is input to the current control circuit 31, and the drive current that operates the drive motor 30 so that the opening degree H of the throttle valve becomes equal to Ht is input to the current control circuit 31.
Output from 1.

The auxiliary control device 36 inputs output signals from the opening sensor 32 and the accelerator sensor 35, and monitors whether the throttle valve 2 is closed when the accelerator pedal 5 is not operated by the driver, and monitors whether the throttle valve 2 is closed or not. If this happens, it is determined that the arithmetic control unit 33 or the electronically controlled actuator 29 has failed, the electric motor 27 is checked, and the throttle valve 2 is closed via the first driving gear 15 to prevent the vehicle from running out of control.

Next, the operation of the throttle valve control device in the above embodiment will be explained. The rotational driving force of the electronically controlled actuator 29 is transmitted to the gear 4 of the throttle valve shaft 3 via the second driving gear 16, the bevel gear 14, the small bevel gears 18, 19, the pinion shaft 17, and the large gear 20. At this time,
To prevent the bevel gear 13 from rotating, that is, the accelerator pedal 5
Assuming that the depression of the throttle valve 2 is kept constant, the opening and closing of the throttle valve 2 is electronically controlled by the transmission path described above so that the target throttle opening Ht is reached according to the two signals H and Ht input to the electronically controlled actuator 29. be done. This movement of the throttle valve 2 follows the instruction of the target opening degree Ht with some response time delay. - 10,000, When the degree of depression of the accelerator pedal 5 changes, the accelerator wire 24 and the segment type disc 2 change according to this movement.
2. Driving force is applied to the axial bevel gear 13 of the differential gear device 10 via the electric motor 27 and the first driving gear 15.

This rotational force acts on the small bevel gears 18 and 19, and causes the pinion shaft 17 to move into the bevel gear 13 in a manner superimposed on the rotation of the bevel gear 14, which is being rotated by the electronically controlled actuator 29.
Rotate in the same direction by half the angle of rotation,
In the same manner as above, the large gear 20. Throttle valve 2 is opened and closed via gear 4. The movement of the throttle valve 2 in response to the depression of the accelerator pedal 5 is superimposed on the movement of the electronically controlled actuator 29, but the speed of response is instantaneous to the movement of the accelerator pedal 5, excluding slack or play in the accelerator wire 24. respond to

In order to make it easier to understand the movement of the throttle valve 2 according to the above explanation, each of the depression degree A of the accelerator pedal 5, the rotation angle θ by the electronically controlled actuator 29, the actual opening degree H of the throttle valve, and the target opening degree Ht of the throttle valve An example of a temporal change in movement is shown in FIGS. 2(a) and 2(b). Figure 2 (a) and (b) show A and θ and H and Ht on the same time axis, and Figure 2 (a)
In the form corresponding to the superimposed angle of A jump shown in,
In FIG. 2(b), the opening degree H of the throttle valve 2 is changing. The instruction for the target throttle opening Ht is output after manually calculating and processing the accelerator depression degree A and the signal from the sensor 34, but the processing speed of the microcomputer normally used as the calculation control section 33 is sufficient. The speed is higher than the mechanical operating speed of the throttle valve. In this way, the present throttle valve control device has the ability to follow the instruction of the target throttle opening Ht which changes rapidly, but the speed of change in the rotation angle of the input shaft rotationally driven by the electronically controlled actuator is slow (see Fig. 2 (a). )) is still excellent. Therefore, as the electronically controlled actuator 29, a very low torque motor can be used if a mechanism with a sufficient reduction ratio is provided on the output side of the drive controller 30, and the drive control circuit also handles a small current. As a result, the entire device can be used in a shed with high safety. Further, if a known harmonic drive mechanism is used as a mechanism for obtaining a large reduction ratio, the size can be further reduced and control accuracy can be improved. In the throttle valve control device according to the present invention, when the electronically controlled actuator 29 becomes inoperable, only the first driving gear 15 can be directly driven by the accelerator pedal 5 via the accelerator wire 24, and the vehicle can be driven. .

Incidentally, in the above-described embodiments, a bevel gear is used as the differential gear device 10, but the present invention is not limited to this. In addition, we showed an example in which the operation of the slave motion relative to the original motion of the differential gear is equal for the two original motions, but if we use a differential gear device that changes this ratio, it will be possible to emphasize high-speed response to accelerator operation. Alternatively, it becomes possible to increase the weight of throttle controllability by electronic control from the electronically controlled actuator side.

〔Effect of the invention〕

As explained above, according to the present invention, the valve shaft that drives the throttle valve is driven via the differential gear device, and the first driving gear of the differential gear device is driven by the accelerator pedal via the electric device. The second drive gear is electronically controlled by an electronically controlled actuator that includes a drive motor while detecting the opening of the throttle valve, resulting in high precision and excellent high-speed response. A throttle valve control device can be obtained, and at the same time, even if the electronically controlled actuator becomes inoperable, the vehicle will not run foggy or become unable to run, resulting in a highly safe device. .

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing a throttle valve control device according to an embodiment of the present invention, and FIG. 2(a) and FIG. 2(b) are characteristics showing temporal changes in the operation of the throttle valve control device. It is a diagram. 2... Throttle valve, 3... Valve shaft, 4... Gear,
5...Accelerator pedal, 10...Differential gear device, 1
5... First driving gear, 16... Second driving gear,
21... Rotating shaft, 24... Accelerator wire, 27...
...Electric motor, 29...Electronic control actuator,
32... Throttle opening sensor, 33... Arithmetic control unit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] a differential gear device having a valve shaft for opening and closing a throttle valve that varies the output of the engine; and an output shaft for driving the valve shaft; a driving gear, a mechanical coupling means for rotationally driving the first driving gear in response to depression of an accelerator pedal, and a second driving gear that meshes with the differential gear and is rotationally driven by a drive motor. A throttle valve control device comprising: an electronically controlled actuator including a driving gear; an opening sensor that detects the opening of the throttle valve; and an accelerator sensor that detects the amount of depression of the accelerator pedal.