JPS6255432A - Throttle valve controller - Google Patents

Abstract

PURPOSE:To detect abnormalities in a return spring for a throttle valve by detecting the position and displacement of the spring from throttle sensor signals and the rotational frequency of an engine from a sensor. CONSTITUTION:Abnormalities in a spring 3 provided between a drive device 4 and a throttle valve 2 are judged by a control unit 6 if the rotational frequency of an engine obtained from a sensor 7 in starting an internal combustion engine exceeds any set rotational frequency of idling and if the displacement of the throttle valve 2 from the condition other than fully closed one and any opening is judged to exceed any value according to the signal of a throttle sensor 5. Similarly, abnormalities in the spring 3 is judged also in the idling condition during travelling or in the engine stop. A driver is informed of the occurrence of abnormalities by a self-diagnose indicator 10 in abnormalities and the necessity of inspection and repair.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a throttle valve control device for an internal combustion engine such as a Ganlin engine, and particularly to self-diagnosis of the throttle valve control device.

[Background of the invention]

Conventionally, related to throttle valve control devices, Japanese Patent Publication No. 50-62408. Examples include Japanese Patent Publication No. 51-138235 and Japanese Patent Publication No. 58-25853. but.

For safety purposes, no consideration was given to the self-diagnosis function of the spring for forcibly closing the throttle valve.

[Purpose of the invention]

An object of the present invention is to provide a throttle valve control device that can detect an abnormality in a return spring of a throttle valve.

[Summary of the Invention] ゛The present invention uses a throttle sensor to inspect the internal combustion engine's speed, spring position, and spring displacement when starting, stopping, and in an idling state during operation, and detecting spring deflection.

Detects abnormalities such as disconnection and deterioration, and when an abnormality occurs.

This system is characterized by notifying the driver of the content of the abnormality.

That is, one aspect of the present invention provides an accelerator sensor that outputs an accelerator opening signal according to the amount of depression of an accelerator pedal, a throttle sensor that outputs a throttle valve opening signal that corresponds to the opening of a throttle valve, and A drive device that is connected to open and close the throttle valve, a spring that forcibly closes the throttle valve, various sensors that detect the operating state of the internal combustion engine, and a drive device that operates based on the accelerator opening degree and the throttle opening signal. The device includes a throttle valve control that controls the direction and amount of rotation of the throttle valve and changes the relationship between the throttle valve opening and the accelerator opening in accordance with various sensor output signals that detect the operating state. The apparatus is characterized in that means is provided for detecting an abnormality in the spring from the throttle sensor signal based on the spring position, the amount of displacement of the spring, and the engine rotational speed from the sensor.

[Embodiments of the invention]

Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the invention.

In the figure, l is a throttle sensor, 2 is a throttle valve, 3 is a spring, and 4 is a throttle valve drive device.

5 is a throttle sensor, 6 is a throttle valve control device,
7 is various sensors for detecting driving conditions; 8 is an accelerator sensor; 9 is an accelerator pedal; 10 is a self-diagnosis display device.

In this embodiment, between the drive device 4 and the throttle valve 2,
A spring 3 is provided so that when the power supply to the throttle valve control device 6 and drive device 14 is stopped, the throttle valve is forcibly closed by the spring 3.

Next, the operating principle will be explained.

The opening degree of the accelerator pedal 9 is detected. Accelerator sensor 8
The control unit ff161c receives various data representing the operating state of the internal combustion engine using the signals and various sensors 7, and calculates the throttle valve opening amount.

Based on the calculated value, an output signal is sent to the drive device 4.

Further, the opening angle of the throttle valve is detected by a throttle sensor 5, and the information is fed back to a control device 6.

Next, spring self-diagnosis will be explained.

First, when starting the internal combustion engine, a sensor detects the engine speed and determines that there is an abnormality when the engine speed exceeds an arbitrary idle setting speed. It also captures the throttle sensor signal and displays that signal.

: Any state other than fully closed is considered abnormal. Also, the throttle valve is rotated by an arbitrary amount, and then the control □□ power supply to the drive circuit is temporarily interrupted. The amount of displacement of the throttle valve during that period is detected from the throttle sensor signal, and if the amount of displacement is larger than an arbitrary value, it is determined that there is an abnormality. In this case, deterioration of the spring can be detected at the same time by determining several types of arbitrary values.

When an idling state is detected while the vehicle is running, the throttle valve position is detected using the same means as described above, and a spring abnormality is determined.

The same applies when the internal combustion engine is stopped.

Detects the throttle valve position and displacement amount, determines if there is an abnormality in the spring, and in the event of an abnormality, activates the self-diagnosis display circuit to display the occurrence of an abnormality to the driver's vehicle, informing the driver that an inspection or repair is required. .

Then turn off the control device. According to the above embodiment,
Since it is possible to determine whether there is an abnormality in the spring, accidents can be prevented.

FIG. 2 is a time chart of one embodiment, and FIG. 3 is a flow chart of one embodiment.

The flowchart of this embodiment will be explained below.

Acquire the accelerator sensor signal (11). Based on the signal, determine whether it is in the idle state (12). If it is not in the IdIe state,
Self-diagnosis is not performed. When in idle state, the ignition switch (Igsw) and starter switch (stsw)
), engine speed (N), and throttle sensor signal (θ) are taken in (13). Then, it is determined whether θ=θ° (the throttle valve is fully closed) (14). If θ=
If IFO0, NG is displayed (20). moreover,
Determine whether Igsw is ON (15) L, OF
At F time, do not perform engine rotation speed N judgment (18)
Execute.

When Igsw is ON, compare N with the sum of idle setting value N and arbitrary rotation speed N2 (16), and if N>Nl+N2, NG is displayed. If N≦N, +N, the first order s
tsw is ON or not (17).

In (17), when stsw, is OFF, the subsequent determination of the displacement amount δ of the throttle sensor per unit time is not executed. When stsw is ON, and when IgSW is OFF.

Increase δ (18) and compare with arbitrary value α (19)
.

If δ≧α, NG is displayed (20). δkuα
If so, there is no problem with the spring, and the self-diagnosis program ends.

〔Effect of the invention〕

As described above, according to the present invention, since abnormalities in the spring can be detected, reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a time chart of the embodiment shown in FIG. 1, and FIG. 3 is a flow chart of the embodiment shown in FIG. 1. 1... Throttle sensor, 2... Throttle valve, 3
... Spring, 4... Drive device, 5... Throttle sensor, 6... Control device, 7... Various sensors, 8...
・Axel Sen Length, 9...Axel Betaru, 10...
・Self-diagnosis display device No. 1 (Fig. 2)

Claims (1)

[Claims] 1. an accelerator sensor that outputs an accelerator opening signal in accordance with the amount of depression of the accelerator pedal; a throttle sensor that outputs a throttle valve opening signal in accordance with the opening degree of the throttle valve; The throttle valve is controlled by the drive device based on a drive device that opens and closes the throttle valve, a spring that forcibly closes the throttle valve, various sensors that detect the operating state of the internal combustion engine, and the accelerator opening degree and the throttle opening signal. In a throttle valve control device that controls the direction and amount of rotation of the throttle valve and changes the relationship between the throttle valve opening and the accelerator opening according to various sensor output signals that detect the operating state, A throttle valve control device comprising means for detecting an abnormality in a spring based on a spring position, a displacement amount of the spring, and an engine rotational speed from a sensor.