JPH02191831A - Electronically controlled throttle device for internal combustion engine in vehicle - Google Patents

Abstract

PURPOSE:To permit a vehicle to in emergency by tightening an endless belt through a tensioner by an artificial control even when a throttle valve is placed in a fully closed condition due to abnormality in a throttle control system. CONSTITUTION:A shaft 3 of a throttle valve is connected to a shaft 5 of a motor by an endless belt 7. A tensioner 8 is provided on the endless belt 7 while connected to a controller artificially controlled through a stopper pin 23 and a wire 24. Now even when the throttle valve 1 is placed in a fully closed condition due to abnormality in a throttle system including the motor 2, the shaft 3 of the throttle valve can be turned in a direction of the tightened endless belt 7 when it is tightened through the tensioner 8 by manually controlling the controller. A vehicle can thus be driven to a private home or a repair shop in emergency by opening the throttle valve 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronically controlled throttle device for a vehicle internal combustion engine.

(Prior Art and Problems to Be Solved) Hitherto, electronically controlled throttle devices for vehicle internal combustion engines have been known that control the opening and closing of throttle valves using motors that are driven and controlled by electronic control circuits.

In such conventional electronically controlled throttle devices, when the electronic control circuit determines that there is an abnormality in the throttle control system, it is common to cut the motor current and use the return spring to fully close the throttle valve. It is.

However, although this allows the vehicle to stop, it does not allow the vehicle to drive itself back to its home or repair shop.

The present invention has been made in view of the above-mentioned circumstances, and even if the throttle valve becomes fully closed due to an abnormality in the throttle control system including the motor, the operation of an artificially operated operating body such as the accelerator pedal An object of the present invention is to provide an electronically controlled throttle device for a vehicle internal combustion engine that opens a throttle valve and enables the vehicle to run in an emergency.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an electronically controlled throttle device for a vehicle internal combustion engine that controls opening and closing of a throttle valve by a motor driven and controlled by an electronic control circuit. The shaft of the motor is connected to the shaft of the motor by an endless belt, and a tensioner is provided on the endless belt, and this tensioner is connected to an operating body that is operated in a formal manner. ,
The throttle valve is characterized in that the throttle valve is opened via the endless belt by displacement of the tensioner in response to the operation of the operating body.

(Function) Even if the throttle valve becomes fully closed due to an abnormality in the throttle control system including the motor, if the endless belt is tensed via the tensioner due to severe operation of the operating body, the throttle valve will move in the direction of the tensioned belt. The shaft can be rotated, thereby opening the throttle valve and allowing the vehicle to travel to home or a repair shop in an emergency.

(Example) Hereinafter, one example of the present invention will be described based on the drawings. 1st
The figure is a block diagram of the electronically controlled throttle device of the present invention, FIG. 2 is a control circuit diagram of the device, and FIG. 3 is an explanatory diagram of the same operation.

In each figure, 1 is a throttle valve, and 2 is a motor. A pulley 4 is connected to the shaft 3 of the throttle valve 1, and a pulley 4 is connected to the shaft 5 of the motor 2.
A boo IJ 6 is fixed to each of the pulleys 4 and 4.
, 6 is wrapped with an endless belt 7 such as a toothed belt.

This endless belt 7 is provided with a tensioner 8.

The tensioner 8 has a pair of rollers 10 and 11 supported by a pair of rollers 10 and 11 on one side of a rectangular parallelepiped block 9 with an interval in the vertical direction. The tensioner 8 is disposed within a case 13 provided on one side of the housing 12 of the throttle valve 1 so as to be vertically movable. That is, the tensioner 8 connects the pin 14 protruding from the upper end surface of the block 9 to the case 13.
The bracket 15 is slidably fitted into the fitting hole I6 of the bracket 15 protruding therein, and the pin 17 protruding from the lower end surface of the block 9 is slid into the fitting hole 18 of the lower wall of the case 13. It is fitted into the case 13 by being movably fitted. The tensioner 8 is urged upward (in the direction in which the throttle valve 1 closes) by a spring 19.
9 is interposed between the lower end surface of the block 9 and the lower wall of the case 13. Both rollers 10 of tensioner 8. An endless belt 7 is inserted between If. The lower end of the pin 17 on the lower end side of the tensioner 48 extends outward from the lower surface of the case 13, and the extended end is provided with a double neck (20.21).
A mouth-shaped bracket 22 is attached. A locking pin 23 is rotatably installed between both sides of the bracket 22. A wire 24 is attached to this locking pin 23.
The tensioner 8 is connected to an operating body, for example, an accelerator pedal (not shown), which is ceremonially operated via the throttle valve 1, and the throttle valve 1 is opened by the downward displacement of the tensioner 8 caused by the operation of the accelerator pedal. The throttle valve 1 is provided with a potentiometer 25 that indicates its opening degree.

4178. which is generated depending on the voltage Vo of the potentiometer 25 and the amount of depression of the accelerator pedal. voltage (position command voltage) Vi by the comparator circuit 26, and the difference voltage is amplified by the amplifier circuit 27 and inputted to the drive circuit 2 to drive and control the motor 2. The voltage Vo is made to match the target voltage Vi.

In normal times, the drive control of the motor 2 is controlled by changing the target voltage Vi based on the signal input to the electronic control circuit (computer) that corresponds to the driver's will, thereby controlling the pulley 4.6 and the endless belt 7. Opening and closing of the throttle valve l is controlled via the throttle valve l.

Further, if an abnormality occurs in the throttle control system including the motor 2, the throttle valve 1 is fully closed due to the biasing force of the return spring, and the vehicle stops. In such a case, when the accelerator pedal is depressed, the tensioner 8 is displaced from the state shown by the solid line in FIG. (8), the pulley 4 rotates in the direction of the belt where the endless belt 7 is tensioned), thereby the throttle valve 1 is moved from the fully closed state shown by the solid line in FIG. 3 via the pulley 4.6 and the endless belt 7. The valve is opened to the extent shown by the dotted chain line in Figure 3 to allow the vehicle to run, allowing it to travel in an emergency, allowing it to drive itself back to its home or repair shop.

In addition, when an abnormality occurs, fully close the throttle valve l by 6'.
The motor 2 may be fixed by liR. By fixing the motor 2, only the pulley 4 rotates, and the opening amount of the throttle valve 1 increases. If the rotational resistance of the throttle valve l is greater than the rotational resistance of the motor 2, the motor 2 must be fixed in this way.The motor 2 can be fixed by passing a hold current through the motor 2.

(Effects of the Invention) As described above, according to the electronically controlled throttle device of the present invention,
The shaft of the throttle valve and the shaft of the motor are connected by an endless belt, and a tensioner is provided on the endless belt, and this tensioner is connected to an operating body that is operated ceremoniously. , the throttle valve is opened via an endless belt by the displacement of the tensioner caused by the operation of the operating body, so even if an abnormality occurs in the throttle control system including the motor and the throttle valve becomes fully closed, the accelerator will not open. Since the throttle valve can be opened by operating an operating body such as a pedal, it is possible to drive the vehicle in an emergency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 shows the electronic control system of the present invention! FIG. 2 is a configuration diagram of the throttle device, FIG. 2 is a control circuit diagram of the device, and FIG. 3 is an explanatory diagram of the same operation. 1...Throttle valve, 2...Motor, 3...
Throttle valve shaft, 5... Motor shaft, 7...
Endless belt, 8... tensioner.

Claims (1)

[Claims] In an electronically controlled throttle device for a vehicle internal combustion engine in which opening and closing of a throttle valve is controlled by a motor driven and controlled by an electronic control circuit, the shaft of the throttle valve and the shaft of the motor are connected by an endless belt, and the endless belt is provided with a tensioner, and this tensioner is connected to an operating body that is manually operated, so that when there is an abnormality in the throttle control system including the motor, the tensioner is disposed through the endless belt due to the displacement of the tensioner caused by the operation of the operating body. An electronically controlled throttle device for a vehicle internal combustion engine, characterized in that the throttle valve is opened.