JPS61237842A - Throttle valve control device - Google Patents

Abstract

PURPOSE:To enhance safety, by providing a clutch mechanism, in which an actuator cuts off transmission of its driving power to a throttle valve responding to the brake action, in the case of a control device rotating the throttle valve to be driven by said electronically controlled actuator. CONSTITUTION:A throttle shaft 3 is urged in the direction closing a throttle valve 1 by a return spring mechanism 4, and a control device, connecting the output shaft of a mechanical clutch 5 with the throttle shaft 3, connects an output shaft 6a of an electronically controlled actuator 6 with the input shaft of said clutch 5. The electronically controlled actuator 6 is controlled by a control unit 7 in accordance with outputs of sensors 8, detecting an operative condition in an engine, and an output from an accelerator opening sensor 10 detecting a depressing distance of an accelerator pedal 9. While the control device, providing in the mechanical clutch 5 a control part 11 controlling it to be engaged and disengaged, actuates the clutch 5 to be placed in a disengaged condition responding to the depressing action of a brake pedal 12 through a wire 13 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve control device equipped with an electronically controlled actuator that rotates a throttle valve according to the operating condition of an engine, particularly a vehicle.

[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 electric quantity (accelerator depression amount signal) has been added. 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 signals (for example, an engine rotational speed signal, a gear position signal, etc.) representing the engine operating state or vehicle running state is underway.

In this electronically controlled actuator-based throttle valve control device, the opening and closing of the slot A/pal valve is performed by a drive motor that operates upon receiving commands from the arithmetic control unit. It is necessary to install a safety device to prevent the vehicle from running out of control when the situation occurs. Examples of such safety devices include (1) installing a toss return spring on the throttle shaft to keep the throttle valve in the closed position when the control is stopped; Attached configuration.

(2) A configuration that includes an electromagnetic clutch that disconnects the throttle shaft from the electronically controlled actuator when control becomes impossible.

(3) A configuration in which a return spring and an electromagnetic clutch are combined, and the return spring is activated when the electromagnetic clutch is disengaged.

is disclosed in Japanese Patent Application Laid-open No. 145867/1983.

[Problem that the invention seeks to solve]

However, according to such conventional devices, for example, regarding (1) above, the actuator maintains the braking torque when the control is stopped, and does not perform the safety protection function when the actuator is in a failure state close to a stuck state. There was a problem that there was no. Regarding (2) and (3) above, when the above-mentioned failure occurs, the electromagnetic clutch is controlled based on the failure signal (electrical signal), and this electromagnetic latch is used to control the throttle from the electronically controlled actuator. By disconnecting the shaft, the attempt was made to ensure that the actuator always functions safely. However, the causes of failure in electronically controlled actuators in the electrical circuit are generally electrically controlled. In many cases, this also affects the control circuit of the electromagnetic clutch, and it is hard to say that sufficient safety is necessarily guaranteed.

The present invention has been made in view of these points, and its purpose is to provide a safe throttle valve control device that can reliably prevent the vehicle from running out of control even if the electronically controlled actuator fails. To provide 6
Ru.

[Means for solving problems]

In order to achieve such an object, the present invention is provided with a mechanical clutch mechanism so as to cut off the transmission of the rotational driving force of the electronically controlled actuator to the throttle valve in response to a brake operation.

[Effect]

Therefore, according to the present invention, it is possible to disconnect the electronically controlled actuator and the throttle valve by operating the brake. [Embodiment] A throttle valve control device according to the present invention will be described in detail below. The figure is a schematic configuration diagram showing one embodiment of this throttle valve control device. In the figure, reference numeral 1 denotes a throttle valve rotatably supported via a throttle shaft 3 in the conduit of an air intake pipe 2; 4 acts on the throttle valve 1, and connects the throttle valve 1 to the intake pipe 2 This is a return spring mechanism that always biases the conduit in the closing direction. The return spring mechanism 4 is fitted into a throttle shaft 3, and the throttle shaft 3 is connected to an output shaft (not shown) of a mechanical clutch 5. Further, an output shaft 6 & of an electronically controlled actuator 6 is connected to an input shaft (not shown) of this mechanical clutch 50, and this electronically controlled actuator 6 is appropriately controlled by a control signal 7a sent from a control device 7. It is supposed to be done.

That is, the control device [7 is the operating state of the engine (
For example, signals sent out by sensors 8 that detect rotation speed, torque, cooling water temperature, etc.) and signals sent out by accelerator opening sensor 10 that detects the amount of depression of the accelerator pedal 9 are combined, and these G signals are processed by calculation. The electronically controlled actuator 6 is driven in accordance with the control signal 7m and transmits a rotational driving force generated at the output shaft 6a. It is configured to transmit the signal to the throttle valve 1 via the mechanical clutch 5. Tsuma,
The throttle valve 1 rotates around the throttle shaft 3 in accordance with the operating state of the vehicle, and is maintained at an appropriate opening amount depending on the normal operating state.

On the other hand, the mechanical clutch 5 is provided with an operating section 11 that controls the engagement/disengagement operation of the clutch, and the engagement/disengagement operation of the operating section 11 is controlled in response to the depression of the brake pedal 12. It has become. That is, one end of the wire 13 is linked to the brake pedal 12,
The other end is mechanically connected to the operating section 11, and the pressing force of the brake pedal 12 is transmitted to the operating section 11 via this wire 13. The transmitted pedal force operates the operating section 11, and the clutch 5 is disconnected. Note that 14 is a well-known brake device that is mechanically linked and connected to the brake pedal 12 and operates in response to the depression of the brake pedal 12.

Next, the operation of the throttle valve control device configured as described above will be explained. That is, when the driver depresses the brake pedal 12, the pedal force is transmitted to the operating section 11 of the clutch 5 via the wire 13, the operating section 11 is operated, and the clutch 5 is disconnected. As a result, transmission of the rotational driving force from the electronically controlled actuator 6 to the throttle valve 1 is cut off. Therefore, the throttle valve 1 quickly returns to the closed state by the action of the return spring mechanism 4. That is, even if the vehicle attempts to drive out of control when the electronically controlled actuator 6 is in a failure state that is close to a stuck state, the connection between the electronically controlled actuator 6 and the throttle valve 1 is severed by depressing the brake pedal 12, and the throttle valve 1 is immediately removed. Since the vehicle can be returned to the closed state, it is possible to prevent the vehicle from running out of control. In addition, the clutch 5 is made mechanical and the wire 13
Since the engagement and disengagement of the clutch is controlled through
Even if an abnormality occurs in the electric circuit, the clutch 5 can be reliably disconnected without being affected by the electric circuit.

When the driver releases the brake pedal 12, the clutch 5 directly connects the rotational driving force between the throttle valve 1 and the electronically controlled actuator 6. As a result, the throttle valve 1 is again controlled to open and close against the force in the closing direction of the return spring mechanism 4 by the rotational driving force of the electronically controlled actuator 6 based on the control signal 7a of the control device 7f). Ru. Incidentally, the brake device 14 performs normal operation for moving the vehicle body in response to the brake pedal 12 regardless of the operation of the clutch 5 and the wire 13.

In this embodiment, the pressing force of the player pedal 12 is transmitted to the operating section 11 of the clutch 5 via the wire 13, but instead of the wire 13, it is transmitted via a brake hydraulic pressure conduit that operates the brake device 14. The brake pedal pressure may be transmitted to the operating unit 11 by using the brake pedal. In addition, the brake device 14
A hydraulic cylinder may be provided independently for the hydraulic cylinder, and the hydraulic pressure of the hydraulic cylinder may be transmitted to the operating section 11 via a hydraulic pipe.0 [Effects of the Invention] As explained above, the throttle valve control device according to the present invention In addition, a mechanical clutch mechanism is installed to cut off the transmission of rotational driving force from the electronically controlled actuator to the throttle valve in response to brake operation, ensuring that the vehicle will not run out of control even if the electronically controlled actuator fails. It is possible to prevent this from occurring and improve safety.

[Brief explanation of drawings]

The figure is a schematic configuration diagram showing an embodiment of a throttle valve control device according to the present invention.

Claims (1)

[Claims] In a throttle valve control device that includes a throttle valve having a return spring mechanism that normally acts in the closing direction, and an electronically controlled actuator that rotates the throttle valve according to the operating state of the engine, the electronically controlled actuator operates in response to a brake operation. A throttle valve control device comprising a mechanical clutch mechanism that cuts off transmission of rotational driving force of a control actuator to the throttle valve.