JPH0410357Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a safety device for a throttle valve mechanism of an internal combustion engine driven by an actuator.

Prior art This type of conventional safety device is, for example,
As described in Publication No. 122742, when the actuator fails and becomes inoperable, the connection between the throttle valve and the actuator is removed, and the throttle valve is mechanically returned to the minimum opening using a spring or the like. This method was designed to prevent the engine from running out of control, but in this case, it was simply stopping the vehicle safely, so it was difficult to prevent the failure from occurring at night or in a remote area or inside a tunnel. In this case, a sufficient fail-safe effect could not be achieved.

Purpose In view of the above-mentioned problems, the present invention has been developed to develop an internal combustion engine throttle system that can safely stop a vehicle in the event of an actuator failure and allow the vehicle to start running again, in order to exhibit a sufficient fail-safe effect at any time and place. The purpose of this invention is to provide a safety measure device for valve mechanisms.

Overview The safety device according to the present invention consists of a sub-intake cylinder, a sub-throttle valve that is mounted on the sub-intake cylinder and directly driven by the accelerator pedal, and a shutter that switches between opening and closing the main intake cylinder and the sub-intake cylinder. When the actuator is unable to operate, the main intake cylinder is closed by the shutter and the sub-intake cylinder is opened.Then, the throttle valve mechanism is switched to the actuator-driven throttle valve mechanism, and the throttle valve mechanism directly connected to the accelerator pedal operates the engine. It is designed so that it can be controlled.

Embodiment Hereinafter, the present invention will be explained in detail based on one embodiment shown in the drawings. 1 refers to a main intake cylinder 1a formed in parallel and interposed between an air cleaner and an engine (not shown); and the main intake cylinder 1a. an apparatus main body having a sub-intake cylinder 1b having an opening area smaller than that of the apparatus main body 2;
3 is the main throttle shaft pivotally connected to the main body 1 so as to be perpendicular to the main intake cylinder 1a; 3 is the main intake cylinder 1;
a main throttle valve fixed to the main throttle shaft 2 in a, 4 an electrically driven actuator, for example, which is mounted on the main body 1 and whose drive shaft is connected to one end of the main throttle shaft 2; A sub-throttle shaft 6 is pivotally connected to the main body 1 so as to be perpendicular to the sub-intake cylinder 1b.
The sub-throttle valve 7 is fixed to the sub-throttle shaft 5 inside the sub-throttle shaft 5.
The accelerator wire 8 is fixed to one end of the accelerator wire 8.
A throttle bar 10 is connected to the accelerator pedal 9 through the throttle bar 10 and is directly driven by the accelerator pedal 9. The throttle bar 10 is attached to the main body 1, and its input shaft is connected to the other end of the sub-throttle shaft 5. A potentiometer 11 that detects the opening degree of the throttle valve 6 (corresponding to the position of the accelerator pedal 9) is slidable in a direction perpendicular to both the intake cylinders 1a and 1b on the upstream side of both the throttle valves 3 and 6. A shutter 13 is disposed inside the main body 1 and biased by a spring 12 in the direction of arrow B in FIG. A stopper 14 is for locking the main intake cylinder 1a in the open state and the sub-intake cylinder 1b is closed, and 14 is a solenoid, a diaphragm, etc. for pulling and moving the stopper 13 in the direction of arrow A in FIG. The drive source 15 normally controls the actuator 4 so that the opening degree of the main throttle valve 3 corresponds to the position (depression amount) of the accelerator pedal 9 detected by the potentiometer 10. This is a computer that turns off the power source of the actuator 4 and turns on the drive source 14 when the actuator 4 fails.

Since the safety device according to the present invention is configured as described above, for example, if the manifold negative pressure shows an abnormal value even though the accelerator pedal 9 is in the idling position, or if the engine rotation does not drop, The computer 15 determines that the actuator 4 has failed, turns off the power source of the actuator 4, and turns on the drive source 14.
Then, the stopper 13 is pulled in the direction of arrow A and released from the shutter 11, so that the shutter 11 is moved in the direction of arrow B by the spring 12, closing the main intake cylinder 1a and opening the sub-intake cylinder 1b. Therefore, the engine control action by the main throttle valve 3 is stopped, and instead, the engine control is performed by the auxiliary throttle valve 6, which is directly connected to the accelerator pedal 9, so that the driver can safely stop the vehicle. It will also be possible to run again. Therefore, even if the failure occurs at night or the failure occurs in a remote place or in a tunnel, a sufficient fail-safe effect can be achieved. Also, sub-intake cylinder 1
Since the opening area of the main intake cylinder 1a is smaller than the opening area of the main intake cylinder 1a, the engine output decreases when a failure occurs, and the driver can sense this and determine that there is a failure. The potentiometer 10 is normally used as a sensor for detecting the position of the accelerator pedal 9, but in the event of a failure, it is used as a sensor for detecting the opening of the throttle valve.

Incidentally, the shutter 11 and members directly related thereto may be arranged downstream of both the throttle valves 3 and 6.

Effects of the Invention As described above, the safety device for the throttle valve mechanism of an internal combustion engine according to the present invention enables the vehicle to be safely stopped and restarted in the event of an actuator failure, and prevents the driver from experiencing failure due to a decrease in engine output. It has important practical advantages, such as allowing one potentiometer to function as two sensors depending on the situation.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the safety device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line shown in FIG. 1. 1...Device main body, 1a...Main intake cylinder, 1b...
Sub-intake cylinder, 2...Main throttle shaft, 3...
Main throttle valve, 4...actuator, 5
... Sub-throttle shaft, 6... Sub-throttle valve, 7... Throttle lever, 8... Accelerator wire, 9... Accelerator pedal, 10... Potentiometer, 11... Shutter, 12... Spring , 13... Stopper, 14... Drive source, 1
5... Computer.

Claims (1)

[Claims for Utility Model Registration] (1) In a throttle valve mechanism of an internal combustion engine driven by an actuator, a sub-intake cylinder;
A sub-throttle valve is provided on the sub-intake cylinder and driven directly by an accelerator pedal, and a shutter is provided which switches between the main intake cylinder and the sub-intake cylinder to open and close the main intake cylinder. A safety measure device characterized in that the cylinder is closed and the sub-intake cylinder is opened. (2) The safety device according to claim (1) for utility model registration, characterized in that a potentiometer is connected to the auxiliary throttle valve. (3) The safety device according to claim (1) for utility model registration, characterized in that the opening area of the auxiliary intake cylinder is smaller than the opening area of the main intake cylinder.