JPH01116253A - Throttle control device - Google Patents

Abstract

PURPOSE:To permit a vehicle to ensure its running, when a main motor is in trouble, by providing in series a main throttle valve and a subthrottle valve in an intake pipe and controlling the subthrottle valve to be opened and closed when the main motor, which controls the main throttle valve, causes a trouble. CONSTITUTION:Arranging in series in an intake pipe 4 a main throttle valve 8 controlled by a main motor and a subthrottle valve 10 controlled by a cable 15 connected to an accelerator pedal, in the normal time, the main motor 12 is controlled by a control unit 20 in a manner wherein the main throttle valve 8 obtains its optimum opening, and the subthrottle valve 10 is set so as to always obtain its opening larger than that of the main throttle valve 8. When the main throttle valve 8 is not actuated as instructed by the control unit, interrupting power to the main motor 12 and fully opening the main throttle valve 8 by a coil spring 11, the subthrottle valve 10, connected to the accelerator pedal, is controlled, and a vehicle enables its running to be performed.

Description

[Detailed Description of the Invention] <Industrial Application Minute Hand> The present invention relates to a throttle operating device of the type in which a throttle valve that opens and closes an intake pipe is operated via a motor. This prevents the vehicle from becoming unable to run or running out of control.

<Conventional technology> In recent years, gasoline engines installed in passenger cars, etc. have electronically controlled the amount of fuel supplied, ignition timing, etc. in order to ensure engine performance such as output while preventing exhaust gas pollution and improving fuel efficiency. There are many things. Conventionally, the throttle valves of carburetors and electronic fuel injection systems were opened and closed in response to the driver's will via a cable directly connected to the accelerator pedal, but auto cruise (constant speed driving) devices With the development of automatic transmissions and mechanical automatic transmissions, some have appeared that employ electronically controlled throttle operating devices driven by electric actuators such as servo motors.

In an electronically controlled throttle operating device, a microprocessor normally processes various data such as the amount of depression of the accelerator pedal, clutch engagement status, and intake air temperature, and adjusts the throttle valve to match the vehicle's current driving conditions. Ri1
The opening degree is determined. For this reason, for example, when an auto-cruise system is operating, the opening of the throttle valve is automatically adjusted to maintain the vehicle speed at the set value regardless of the load condition such as when climbing a vehicle, or when a mechanical automatic transmission is operating. When the clutch is disengaged, the throttle valve can be easily closed regardless of the amount of pedal depression.

<Problems to be solved by the invention> Since the electronically controlled gas throttle operation VTLI has a complicated electronic control mechanism, circuit breakage due to vibration etc., detour current due to fuse blowout, etc. Malfunction or stoppage of operation may occur due to radio wave interference caused by vehicle radio or the like, and it is also highly conceivable that the actuator that operates the throttle valve may malfunction.

In such a case, there is a possibility that the throttle valve may not operate as instructed by the control device, causing the vehicle to become unable to travel or to run out of control. Various safety devices have been devised in response to such situations, but all of the conventional devices have complicated structures and have drawbacks in terms of cost.

Means for Solving the Problems> A throttle operating device according to the present invention includes a main throttle valve and a sub-throttle valve that are provided in series with an intake pipe communicating with a combustion chamber of an engine and can open and close the inside of the intake pipe, respectively; A spring member is connected to the rotating shaft of the main throttle valve and biases the main throttle valve to a fully open state; a main motor that is operated to the closing side; a sub-throttle valve operating means that is connected to the sub-throttle valve and that opens and closes the sub-throttle valve in the event of a failure of the main motor; and a control device for controlling the operation of the controller.

In normal driving conditions, the control device controls the opening of the main throttle valve using the main motor, and the auxiliary motor uses the auxiliary throttle valve operating means to maintain the fully open state or always open the main throttle valve. controlled state. In other words, the flow rate of the intake air is determined by r14m depending on the opening degree of the main throttle valve.

On the other hand, if the main motor does not operate as instructed by the control device for some reason, the power to the main motor is cut off, the main throttle valve is fully opened by the spring force of the spring material, and the sub-throttle valve operating means is operated. The sub-throttle valve is opened and closed lll111ii1N to continue driving the vehicle.

Embodiment As shown in FIG. 1, which shows the concept of an embodiment of the throttle operating device according to the present invention, a main throttle valve 8 is provided in the intake pipe 4.
and a sub-throttle valve 10 are provided in series, and the rotation shaft 2 of the main throttle valve 8 includes a torsion coil spring 11 that biases the main throttle valve 8 to the fully open state, and a torsion coil spring 11 that urges the main throttle valve 8 to a fully open state. It is connected to a main motor 12 that operates the main throttle valve 8 to the closing side against a spring force. The intake pipe 6 communicates with a combustion chamber of an engine (not shown), through which intake air passes toward the engine. Similarly to the main throttle valve 8, the sub-throttle valve 10 rotates the intake v at the rotating shaft 18.
! :4, and a cable 15 is connected via a cable stopper 13. This cable 15 is connected to an accelerator pedal (not shown), but in this embodiment, the opening degree of the sub-throttle valve 10 is always larger than the opening degree of the main throttle fp8, for example, 20% to 20% of the total depression amount of the accelerator pedal. It is mechanically set to be fully open at about 30%. Note that the reference numeral 14 in the figure is a return spring.

As shown in FIG. 2, which shows the control system of this embodiment, a control device 20 is connected to the main motor 12, and the main motor 12 is operated by commands from the control device 20. . The control device 20 includes a vehicle speed sensor 22, an engine rotation speed sensor 24, an idle switch 26, and an engine rotation speed sensor 24 disposed in various parts of the vehicle. The crank angle sensor 28 is connected to an air flow sensor 30 and an accelerator position sensor 32 (not shown) that detects the amount of depression of an accelerator pedal, and calculates the optimum throttle opening based on these detected data to operate the main motor 12. . In addition, this system flJtA@
A signal from the throttle opening sensor 34 is also input to the throttle opening sensor 20 .

Therefore, in normal running conditions, the sub throttle valve 10 is always open more than the main throttle valve 8, so the main motor 12 is operated by the control device 20, and the main throttle valve 8
By controlling the opening degree of the intake air, the intake air can be controlled without any problem.

On the other hand, for some reason, the main throttle valve 8 may not be connected to the control device 20.
If the main throttle valve 8 does not close as instructed, the control device 20 cuts off the power supply to the main motor 12 and maintains the main throttle valve 8 in a fully open state by the spring force of the screw second coil spring 11.

and a sub-throttle valve 1 connected to the accelerator pedal.
0 open w44!Control the intake air with one operation. in this case,
Since the accelerator pedal can be changed from fully closed to fully open even with a small amount of depression, it is sufficient for emergency driving such as driving to a repair shop.

In the embodiment described above, the sub-throttle valve 10 is connected to the accelerator pedal to mechanically control opening and closing.
Naturally, it is also possible to use an FFI actuator as this sub-throttle valve operating means. As shown in FIG. 3, which schematically shows the structure of another embodiment of the present invention, a sub motor 16 is attached to the rotating shaft 1B of the sub throttle valve 10, and a control device 22 is connected to the sub motor 16. Incorporate a mechanism that fully opens when the power is not energized.

During normal running, only the main motor 12 is energized to control the opening degree of the main throttle valve 8. In addition, the same reference numerals are used to refer to the members having the same functions as those in the previous embodiment. The same as in the previous embodiment may be used.

However, the main motor 12 etc. broke down and the main throttle valve 8
If the intake pipe 4 does not operate properly and, for example, the intake pipe 4 falls into an open state, there is a risk that the vehicle will run out of control and lead to a serious accident.

Therefore, as shown in Fig. 4, which shows the abnormality detection procedure in such a case, if the throttle valve 8 does not operate normally, first determine whether the main motor 12 operates as instructed, and then check if this is the case. If there is an abnormality, the main motor 12 is de-energized, and the auxiliary motor 16 is energized to determine whether it operates as instructed. If it is determined that the auxiliary motor 16 is also abnormal, the fuel supply and ignition are cut to stop the vehicle, but if the auxiliary motor 16 is normal, the auxiliary throttle valve 10 is opened and closed only by the auxiliary motor 16. control. On the other hand, if the main motor 12 operates normally, it is determined that a sensor or the like has failed, and control is continued using pseudo data or the like.

<Effects of the Invention> ``According to the actuator operating device of the present invention, a main throttle valve and a sub-throttle valve are provided in series with the intake pipe of the engine, and the main throttle valve is connected to the control device via the main motor. At the same time, the sub-throttle valve is operated by this control device, and the sub-throttle valve operating means is connected to the sub-throttle valve so that it is normally fully open, or at least opened more than the main throttle valve, so if the main motor etc. breaks down, By fully opening the main throttle and operating the sub-throttle valve operating means, the sub-throttle valve can open and close the intake pipe. Therefore, even if the main motor fails, the vehicle can continue to run, and at least it can travel to a repair shop.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of an embodiment of a throttle operating device according to the present invention, and FIG. 2 is a block diagram showing its control system.
FIG. 3 is a conceptual diagram showing another embodiment of the present invention, and FIG. 4 is a flowchart for detecting an abnormality. Also, in the figure, 2.18 is a rotating wheel, 4 is an intake pipe, 8 is a main throttle valve, 10 is a sub throttle valve, 12 is a main motor, 15 is a cable, 16 is a sub motor, and 20 is a control It is a device.

Claims (1)

[Claims] A main throttle valve and a sub-throttle valve are provided in series with the intake pipe communicating with the combustion chamber of the engine and can open and close the intake pipe respectively, and are connected to the rotating shaft of the main throttle valve to fully open the main throttle valve. a spring member that biases the main throttle valve toward the closed state; a main motor that is connected to the rotating shaft and operates the main throttle valve toward the closing side against the spring force of the spring member; A throttle operating device comprising: a sub-throttle valve operating means that opens and closes the sub-throttle valve in the event of a failure of the main motor; and a control device that controls at least the operation of the main motor according to vehicle running conditions.