JPH034761Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention relates to a safety mechanism for a throttle valve drive device, in particular,
The present invention relates to a safety mechanism for a throttle valve drive device that can safely maintain control even if a failure occurs in the actuator in a throttle valve driven by an actuator.

[Technical background of the invention] Recently, throttle valves have been controlled by computers. In this case, the amount of depression of the accelerator pedal is converted into an electrical signal and input to the computer, and at the same time, various quantities such as engine conditions such as engine speed and water temperature, and atmospheric temperature are also input, and all of these are input. As a result of this consideration, the optimal opening degree of the throttle valve is determined, and the opening and closing of the throttle valve is controlled by the actuator.

[Problems with the Background Art] In the case of a conventional device having the series of control mechanisms described above, if an abnormality occurs in the actuator that controls opening and closing of the throttle valve, the control may become completely uncontrollable.
For example, if the throttle valve becomes uncontrollable when it is fully open, the vehicle will run out of control, which is extremely dangerous.

[Purpose of the invention] The present invention has been made to solve the above problems, and aims to provide a safety mechanism for a throttle valve drive device that can be controlled by the accelerator pedal even if an abnormality occurs in the actuator. The purpose is

[Summary of the invention] The invention includes a first lever that is connected to the shaft and normally operates according to the rotation of the shaft by an actuator, and a first lever that is also attached to be rotatable around the shaft and that normally operates according to the rotational force of a spring. It consists of a second lever that is locked by a stopper so as to prevent this from happening, and a third lever that is rotatably mounted around the shaft and connected to the accelerator pedal. When this is detected, the second lever is energized and the first and third levers are connected to enable control using the accelerator pedal.

[Embodiments of the invention] Examples will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of the safety mechanism of the throttle valve drive device according to the present invention, in which FIG. 1A is a plan view showing only the main parts, and FIG. 1B is a side view.

In FIGS. 1a and 1b, reference numeral 1 denotes a throttle valve shaft (hereinafter referred to as "shaft"), and a lever 2 is rotatably engaged with the shaft 1 as a center.
That is, the lever 2 can freely rotate without being restricted by the shaft 1, and is connected to a wire 3 from an accelerator pedal (not shown). Lever 4
Like the lever 2, it is rotatably engaged with the shaft 1, and is therefore independent from the shaft 1. A locking portion 5 is provided on the side surface of the lever 4, and one end of a spring 6 is connected to the locking portion 5, so that the lever 4 is always connected to the arrow A (FIG. 1b).
receiving a directional force. 7 is a stopper;
This tip 7A is protruding, and the A of the lever 4 is
Prevents directional rotation. Lever 8 is shaft 1
The shaft 1 is fixed to the shaft 1 and rotates integrally with the shaft 1. A contact piece 8A is provided at the end of the lever 8 so as to protrude, and is configured to contact the upper part of the lever 4, as shown in FIG. 1a. The throttle valve 9 is fixed to the shaft 1, and its opening and closing are controlled by a motor 10, which is an actuator. A locking piece 11 is provided on the lever 2 to protrude, and the stopper 7 is connected to, for example, a solenoid. 12 is a return spring.

Next, the operation will be explained. As is clear from the above configuration, in normal conditions, the lever 2 is not restrained by the shaft 1, and the lever 4 is restrained by the tip 7A of the stopper 7, so that the motor 10 receives a control signal from a computer (not shown). The throttle valve 9 is rotated in accordance with the opening and closing control of the throttle valve 9. That is, under normal conditions, the lever 8 fixed to the shaft 1 controls opening and closing from the idling position 1D to the wide open positions W, O, and T in accordance with control signals. At this time, the lever 2 is linked to the accelerator pedal, but since the lever 2 and the shaft 1 are only rotatably engaged, they move completely independently of the throttle valve 9.

Next, we will explain the case where an abnormality occurs, such as the engine speed not decreasing even though the computer has issued a command to the throttle valve 9 to "close", as shown in Figures 1 and 2. I will explain. Here, FIG. 2 is a state diagram after the occurrence of an abnormality, and corresponds to FIGS. 1a and 1b.

First, when an abnormality occurs, as mentioned above, for example, it is detected that the engine speed does not decrease and the solenoid is energized, and in response to this, the stopper 7 is attracted in the direction of arrow B in the figure, and the tip 7A of the stopper 7 is The lock is released and the lever 4 becomes free. However, as described above, the lever 4 is connected to one end of the spring 6 and is constantly receiving a force in the direction of arrow A (FIG. 1b), so it begins to rotate in the A direction. In this case, the contact piece 8A of the lever 8 connected to the shaft 1 also continues to be rotated by the spring 6, even though the contact piece 8A is connected to the shaft 1. Then, this rotational movement in the A direction ends when the contact piece 8A comes into contact with the locking piece 11 of the lever 2. This state is shown in FIGS. 2a and 2b. As shown in FIG. 2, the lever 4 connected to the shaft 1 is pressed against the locking piece 11 via the lever 4 by the spring 6. Therefore, the lever 2, which had been free from the shaft 1 without any restraint, is now mechanically connected to the shaft 1 via the pressed lever 8. The connection relationship in this case is approximately 180 degrees, and when viewed from the throttle valve 9 side, it is inverted at the same position. Moreover, since the lever 2 is connected to the shaft 1, control by the accelerator pedal is possible via the wire 3. In this case, the return spring 12, lever 2, and wire 3 can operate as in the prior art, allowing controllable running.

In the above embodiment, it was explained that when an abnormality is detected, the solenoid is energized to release the lock, but the present invention is not limited to this, and any function that releases the stopper upon detecting an abnormality may be used. That is clear.

[Effects of the invention] As explained above, according to the present invention, the lever connected to the shaft is rotated when an abnormality is detected and is engaged with the lever connected to the accelerator pedal, so that control when the actuator is abnormal is possible. It is possible to provide a safety mechanism for a throttle valve drive device that can resolve the problem and allow safe driving.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the safety mechanism of the throttle valve drive device according to the present invention, and FIG. 2 shows the state of the safety mechanism after operation. 1... Throttle valve shaft, 2, 4, 8... Lever, 3... Wire, 5... Locking part, 6... Spring, 7... Stopper, 7A... Tip of stopper 7, 8A... Contact piece, 9... Throttle valve, 10
... Motor, 11 ... Locking piece, 12 ... Return spring.

Claims (1)

[Scope of utility model registration request] In a throttle valve driving device that rotates a throttle valve shaft by driving an actuator and controls the opening and closing of the throttle valve, a first motor is connected to the throttle valve shaft and normally operates in accordance with the rotation of the throttle valve shaft by the actuator. a lever, a second lever that is rotatably mounted around the throttle valve shaft and is normally locked by a stopper to prevent rotation by a spring of the lever; and a second lever that is rotatably mounted around the throttle valve shaft; a third lever rotatably mounted and connected to the accelerator pedal; when the actuator is unable to control the lever, the second lever rotates the contact piece of the first lever by the rotational force of the second lever; A safety mechanism for a throttle valve drive device, comprising a locking piece provided on a third lever to connect the first lever and the third lever.