JPH0579809A - Throttle-valve-opening detecting apparatus - Google Patents

Abstract

PURPOSE:To make it possible to avoid the erroneous detection caused by the short break of an output voltage by providing two or more variable resistors whose output voltage values become equal. CONSTITUTION:A rotary body 7, which is associatively moved with a throttle valve in the air intake system of an internal combustion engine, has brushes 8a and 8b. The opening degree of the throttle valve is detected based on the output values obtained by sliding on resistor patterns 1a and 1b of a resistor substrate 9, on which the brushes 8a and 8b are provided so as to face each other in the close proximity. At this time, two or more variable resistors whose output voltage values are equal, are connected to the resistor patterns 1a and 1b with terminals 2-5. When the short break of one output voltage occurs because of the abrasion of the patterns 1a and 1b and abrasion powder caused by the sliding of the brushes 8a and 8b on the resistor patterns 1a and 1b, the erroneous detection caused by the short break of the output is prevented by detecting the output voltages of the normal variable resistors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve opening detecting device for detecting a throttle valve opening degree for adjusting an intake air amount of an internal combustion engine, and more particularly to a variable resistor type throttle valve including a brush and a resistance pattern. The present invention relates to an opening degree detection device.

[0002]

2. Description of the Related Art In a conventional device, there is one variable resistor composed of a brush and a resistance pattern as described in JP-A-63-238404.

[0003]

SUMMARY OF THE INVENTION The throttle valve opening detection device disclosed in the prior art has an instantaneous interruption of the output voltage due to the abrasion of the resistance pattern caused by the brush sliding on the resistance pattern and the influence of the abrasion powder. Was not considered.

The present invention comprises two or more variable resistors having the same output voltage value, and when one variable resistor causes an output interruption, the remaining normal variable resistors are used. By doing so, it is an object to avoid erroneous detection of the output voltage due to instantaneous interruption of the output voltage.

[0005]

In order to achieve the above object, two or more variable resistors having the same output voltage value are installed. Moreover, in order to install two or more variable resistors, two or more resistance patterns are installed on the substrate that constitutes the resistance pattern. Further, two or more brushes that slide on the respective resistance patterns are installed.

[0006]

The two or more variable resistors output the same voltage value. As a result, when the output voltage of one variable resistor is momentarily cut off, the output voltage of the remaining normal variable resistor is detected, so that erroneous detection due to momentary output interruption is eliminated.

[0007]

1 to 4 show a throttle valve open detection device according to an embodiment of the present invention.

The operation of the throttle valve opening detection device having the above structure will be described.

Although not shown, the throttle valve in the intake system of the internal combustion engine is attached to a throttle valve bearing, and a lever is connected to one of the shaft ends of the throttle valve shaft to open the throttle valve. It is connected to the lever 6 on the side of the degree detecting device. With the above configuration, the rotation of the throttle valve shaft is transmitted to the rotating body 7 via the lever 6. Brushes 8a and 8b are attached to the rotating body 7, and a certain output value is obtained by sliding the brushes 8a and 8b on the resistance patterns 1a and 1b of the resistor substrate 9, and the throttle valve is provided by the output value. Will detect the opening degree of. Appendices 2, 3, 4, and 5 are connection terminals from the chamber resistor and have a circuit as shown in FIG. 3, and the terminals 3 and 4 output voltages 3a and 4a as shown in FIG. To be done.

In the above structure, when two or more resistance patterns 1a and 1b having the same output voltage 3a and 4a are installed, when the output voltage 3a is momentarily cut off (3a <Vmin), the other output voltage Since 4a is detected, erroneous detection due to output interruption can be prevented.

[0011]

According to the present invention, the erroneous detection of the output value due to the output interruption of the variable resistor can be avoided, so that the reliability of the detection capability is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of a throttle valve opening detection device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the throttle valve opening degree detection device.

FIG. 3 is an electric circuit diagram of a throttle valve opening detection device that is an embodiment of the present invention.

FIG. 4 is an output characteristic diagram of the throttle valve opening detection device.

[Explanation of symbols]

1a, 1b ... Resistance pattern, 2 ... Input terminal, 3 ... Output terminal A, 4 ... Output terminal B, 5 ... GND terminal, 6 ... Lever,
7 ... Rotating body, 8a, 8b ... Brush, 9 ... Resistor substrate.

Claims (1)

[Claims] 1. A rotary body that interlocks with a throttle valve in an intake system of an internal combustion engine, wherein the rotary body has a brush, and
In a variable resistor type throttle valve opening detection device in which the brush slides on a resistance pattern of a substrate provided in close proximity to the brush, two or more variable resistors having the same output voltage value. A throttle valve opening detection device comprising: