JPS60243348A - Throttle valve opening detection device - Google Patents

Abstract

PURPOSE:To control the quantity of intake air accurately, returning a throttle valve once to the completely closed position by means of an actuator in case that some trouble is caused with a zero-point switch of a throttle sensor, and executing control of air quantity by considering the position where the throttle valve is stopped as a zero point in a ''soft'' manner. CONSTITUTION:The quantity of intake air is controlled by detecting the opening of a throttle valve by means of a throttle sensor having a full-opening throttle switch (zero-point switch). At a step 30, judgement is made whether some trouble is caused with the zero-point switch or not. In case of NO, the program proceeds to a step 31, where the output of the zero-point switch is picked up. Further, at a step 32, the quantity of intake air is controlled in an ordinary manner. In case that the above judgement is YES, on the other hand, the program proceeds to a step 33, where the throttle valve is returned once to the completely closed position by means of an actuator. Then, the program proceeds to a step 34, and the position where the throttle valve is stopped by the zero- point switch is considered as a zero point in a ''soft'' manner. Subsequently, control of the air quantity is processed at the step 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention 1] The present invention relates to a throttle valve opening detection device, and particularly to a throttle valve opening detection device that takes measures against zero point failure of the throttle valve. be.

[Prior Art] When controlling an internal combustion engine, it is important that a throttle valve maintains an accurate opening degree.

Generally, the means to detect the opening degree of the throttle valve are as follows:
A system is used in which a body length of 1 meter is attached to a shaft that is linked to a throttle valve, and an electric signal is obtained by changing the partial pressure output of the potentiometer according to the rotation of the shirt 1. However, this type of system requires zero point adjustment, and the zero point that becomes the C reference is determined by a predetermined output when the thrower 1 hell valve is fully open, and the reference position of the throttle valve is also confirmed. A fully closed switch for throwers 1 to 1 can also be installed. Zero point adjustment is performed during assembly, but this value varies depending on changes in age and other factors.

For this reason, a process has been carried out as shown in, for example, Japanese Unexamined Patent Publication No. 5810131. Figure 1 shows a conventional device;
FIG. 2 is a flowchart showing the processing contents. At d3 in FIG. 1, the full throttle switch 1 is connected to the switch J! via the buffer 2. l! Step 20 of FIG.
It is determined whether the throttle valve is fully open (stopped). If it is fully open, the output VO from the throttle sensor 4 at that time is input to the processing device 3 via the buffer 5 and the to/D converter 6 and stored in the memory (steel 21). Then, the process moves to step 22 and the throttle opening degree θ is set to the idle angle θ0. That is, the throttle sensor output when the throttle valve is fully open is stored as the reference idle angle. If the throttle valve is not fully open in step 2o (operating state), the process moves to step 23, where the difference between the output Vx from the throttle sensor 4 at that time and Vo stored in advance is calculated, and a signal corresponding to the opening degree θX is used. , in step 24, the throttle opening degree θ is set to θ×.・[Problem with the prior art 1 The above conventional device detects the fully open state of the thrower 1 with a throttle fully open switch (zero point switch), stores the throttle sensor output at this time as a reference value in advance, and detects the fully open state of the throttle. By taking the difference from the operating output when it is not,
This is intended to detect the accurate thrower 1 heel opening. However, if the full throttle switch provided in the throttle sensor fails, there is a problem that accurate detection of the throttle opening becomes impossible.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and provides a throttle valve opening degree detection device that can send out an accurate amount of air even when the zero point switch fails. The purpose is to

[Summary of the Invention] In the present invention, when the zero point is not detected during the J-begin operation state, that is, when the zero point is not detected during starting and deceleration, it is determined that the zero point switch and related circuits are malfunctioning, and the actuator is activated. The system attempts to control the amount of air by returning the throttle to the fully open position and then turning the stopped position to zero, ignoring the zero point switch.

[Embodiment 1 of the Invention] An embodiment will be described below with reference to the drawings. Note that, prior to explaining the embodiments, the present invention will be explained in detail.

In other words, if it is determined that the zero point detection switch is malfunctioning, it is unknown at what position the throttle valve is currently operating, so the maximum change that the throttle valve can take is set in the fully open direction. Give a command to move to the stop position and move it to the stop position.The stopped position is the zero point switch position, so use this position as a reference, that is, reset to zero by software, and after that, the zero point switch Therefore, correct control can be achieved by ignoring this. Therefore, the only configuration required is to install an actuator to return the throttle valve to the fully closed direction.

FIG. 3 is a flowchart for explaining the operation. Third
In the figure, in step 3o, it is determined whether or not the zero-person switch is malfunctioning, and if it is not malfunctioning, the process moves to step 31 to take in the output from the zero point switch, and step 32
The air amount control process is performed as before.

On the other hand, if it is determined in step 30 that the one-point switch is malfunctioning, the process moves to step 33 and the C throttle valve is once returned to the fully open position by the actuator. At this time, a command is issued to the j' cuticoator to avoid moving it by the maximum amount of change that the throttle valve can take. Next, the process moves to step 34, where the stopped position is set as the zero point by software using the zero point switch L, and control processing is performed in step 32.

In the above embodiment, only the throttle valve was explained.
It goes without saying that the present invention is not limited to this, and can be applied to an EGR (exhaust gas recirculation) valve.

[Effects of the Invention] As explained above, according to the present invention, when the zero point switch of the throttle sensor 4 that detects the throttle valve position fails, the actuator returns the throttle valve to the -U fully closed direction and returns it to the stopped position. -C is set as zero point by software.
Since it is configured to control 2p- and +, it does not require much modification to the hardware configuration, and provides a throttle valve opening detection device that can accurately control the air amount and exhaust gas circulation amount. can.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a conventional throttle valve opening detection device, Fig. 2 is a 70-diameter diagram for explaining the operation, and Fig. 3 is a diagram showing the function and operation of the throttle valve opening detection device according to the present invention. It is 70-diya 1 for. 1...Throttle fully closed switch 2.5...Buffer 3...Processing device 1...Throttle throttle no.6
... / D converter Special Clearance Applicant Nikkoku J Nigyo Co., Ltd. Representative Norio Doishi Patent Attorney Figure 1 Figure 2

Claims (1)

[Claims] A throttle valve opening detection device that uses a throttle sensor equipped with a zero point switch to detect the opening of the throttle valve and control the amount of air has an actuator that drives a 10-point switch. 1. A throttle valve opening detecting device, characterized in that a control operation is performed by once returning the throttle valve to a fully open direction and setting the stop position to zero point.