JPH0658138U - Accelerator position detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an accelerator opening detection device capable of accurately detecting the accelerator opening without being affected by engine vibration and heat generation. [Constitution] A detection unit for detecting an angle of an injection lever for controlling an engine output is installed separately from the engine. An accelerator opening sensor including an E-shaped core is provided in the detection unit. The copper plate of the accelerator opening sensor is connected to the injection lever by a push-pull wire. Then, the copper plate moves in accordance with the change in the angle of the injection lever. Then, the counter electromotive force of the detection coil (detector) of the accelerator opening sensor, which is not in contact with the copper plate, changes accordingly. If the back electromotive force changes,
It is output as an opening degree detection signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an accelerator opening detection device that detects an accelerator opening by detecting an angle of a lever that controls an engine output installed in an engine of an automobile or the like.

[0002]

[Prior art]

 As a conventional device for detecting the angle of the lever that controls the engine output, there is, for example, one shown in FIG. FIG. 5 shows a simplified example of a detection unit installed in the injection pump of a diesel engine. In the figure, 31 is an injection lever that is connected to an accelerator wire 32 to control the amount of fuel delivery, 33 is a detection unit that is connected to the injection lever 31 and a rod 34, and 35 is a power supply to the detection unit 33 and a detection signal. It is an electric cable for taking out.

The engine output is controlled by the injection lever 31, and at that time, the angle of the injection lever 31, that is, the accelerator opening degree is detected by the detection unit 33. The detected accelerator opening is transferred as a detection signal to an electronic control unit such as a microcomputer via the electric cable 35, and becomes an input for controlling the electronic control unit.

The detection unit 33 is composed of a potentiometer, for example, as shown in FIG. The change in the angle of the injection lever 31 displaces the slider 36 of the potentiometer via the rod 34. Then, the voltage between the terminals a to c changes, and the change is output as a detection signal indicating a change in the opening.

A conventional apparatus using an accelerator opening sensor is disclosed in Japanese Utility Model Laid-Open No. 63-154744.

[0006]

[Problems to be solved by the device]

 The conventional accelerator opening detection device is configured as described above, and the detection unit 33 is directly attached to the engine. Therefore, the vibration of the engine is transmitted to the detection unit 33, and the vibration gives an error to the detection signal of the detection unit 33, as well as the durability. When a potentiometer is used as the detection unit 33, the potentiometer includes the resistor 37, and therefore the heat generated by the engine causes an error in the detection signal, resulting in poor durability.

Therefore, it is an object of the present invention to provide an accelerator opening degree detecting device which can accurately detect the accelerator opening degree without being affected by engine vibration and heat generation and which has improved durability.

[0008]

[Means for Solving the Problems]

 The accelerator opening detection device according to the present invention is a sensor that detects an angle of a lever that controls an engine output installed in an engine, and an accelerator opening sensor that is arranged separately from the engine, the lever and the accelerator opening sensor. The push-pull wire has one end fixed to the position detecting movable part of the accelerator opening sensor, and the detector of the accelerator opening sensor and the position detecting moving part are not in contact with each other. It is a thing.

[0009]

[Action]

 In the accelerator opening degree detecting device according to the present invention, since the accelerator opening degree sensor installed at a position apart from the engine on the chassis side and the lever for controlling the engine output are connected by the push-pull wire, The accelerator opening is transmitted to the accelerator opening sensor via the wire. Further, the detector of the accelerator opening sensor and the push-pull wire do not come into contact with each other at the time of detection, and the reliability of opening detection is further increased due to the reduction of the contact portion.

[0010]

Embodiment FIG. 1 is a configuration diagram showing an accelerator opening detection device according to an embodiment of the present invention together with an injection pump of a diesel engine. As shown in the figure, the detection unit 1 is installed on the chassis side or the like that is not easily affected by engine vibration and the like. A non-contact sensor is used for the detection unit 1. The detection unit 1 is connected to the injection lever 31 on the engine side via the push-pull wire 2. Further, FIG. 2 is a perspective view showing a mounting state of the detection unit 1.

FIG. 3 is a configuration diagram showing a detailed configuration example of the detection unit 1 and the push-pull wire 2. In this case, the push-pull wire 2 is pulled toward the engine side by the injection lever 31 when the accelerator opening is increased, and is pushed in the opposite direction by the injection lever 31 when the accelerator opening is decreased.

Further, as an example of the non-contact type sensor in the detection unit 1, as shown in the figure, for example, a sensor having an E-shaped core 12 can be used. This sensor has a detection coil 13 wound around a bar 17 in the center of the E-shaped core 12 and a movable copper plate 15 that moves along the bar 17. The copper plate 15 is connected to one end of the push-pull wire 2 via the connecting member 18. Therefore, the copper plate 15 moves along the bar 17 according to the angular displacement of the injection lever 31, but at the time of detection, the detection coil 13 which is the detector and the copper plate 15 which is the position detection movable portion are different from each other. Do not touch. Therefore, the detector and the position detection movable part are not in contact with each other. That is, the detector and the push-pull wire 2 are not in contact with each other.

When an exciting current flows through the detection coil 13, a magnetic field is generated. Since the copper plate 15 is installed so as to intersect with the magnetic field, an eddy current is generated in the copper plate 15, and the magnetic field ahead of the copper plate 15 (on the side opposite to the detection coil 13) is canceled. . Therefore, when the position of the copper plate 15 changes, the strength of the magnetic field changes and the inductance of the detecting coil 13 also changes. Since the counter electromotive force generated in the detection coil 13 changes accordingly, the position of the copper plate 15 is detected by the value of the counter electromotive force.

It should be noted that another E-shaped core is mounted on the E-shaped core 12 at an angle of 90 ° with respect to the E-shaped core 12 in order to compensate for the influence of temperature and the like. A compensation coil 14 is wound around the center bar of the E-shaped core, and a copper plate 16 is fixed near the tip of the bar. That is, as shown in FIG. 4, by detecting the inductance ratio (ratio of back electromotive force) between the detecting coil 13 and the compensating coil 14, an error due to the influence of temperature or the like is absorbed.

With such a structure, when the accelerator opening becomes large and the push-pull wire 2 is pulled toward the engine (direction A in the figure), the position of the copper plate 15 is also displaced in the direction A in the figure. Therefore, the inductance of the detection coil 13 increases, and the back electromotive force increases accordingly. Further, when the accelerator opening becomes smaller, the injection lever 31 pushes the push-pull wire 2 in the B direction in the figure. Therefore, the position of the copper plate 15 is also displaced in the B direction in the figure. Therefore, the inductance of the detection coil 13 is reduced, and the back electromotive force is reduced accordingly.

The value of the counter electromotive force (actually, the ratio of the counter electromotive forces of the two coils) is output as a detection signal. The value indicated by the detection signal is a value corresponding to the position of the copper plate 15. Therefore, the detection signal reflects the accelerator opening transmitted through the push-pull wire 2. Since these opening degree detecting components are installed apart from the engine, the influence of engine vibration and heat generation is prevented when the accelerator opening degree is detected. Further, the vibration of the engine transmitted to the push-pull wire 2 is absorbed by the wire and hardly affects the copper plate 15. Further, since the contact portion is reduced during the detection, the detection reliability is further improved.

[0017]

[Effect of device]

 As described above, in the accelerator opening detecting device according to the present invention, the accelerator opening sensor is installed away from the engine, and the detector of the accelerator opening sensor does not come into contact with the push-pull wire. As a result, the accelerator opening can be accurately detected without being affected by engine vibration or heat generation, which has the effect of improving the reliability of the detected value. Further, since the detector and the push-pull wire are not in contact with each other, there is an effect that the depression of the accelerator pedal does not become heavy.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an accelerator opening detection device according to an embodiment of the present invention together with an injection pump of a diesel engine.

FIG. 2 is a perspective view showing a mounting state of a detection unit.

FIG. 3 is a configuration diagram showing a detailed configuration of a detection unit and a push-pull wire.

FIG. 4 is an explanatory diagram showing an opening degree detection method of an accelerator opening degree sensor having an E-shaped core.

FIG. 5 is a configuration diagram showing a conventional accelerator opening detection device together with an injection pump of a diesel engine.

FIG. 6 is a configuration diagram showing a configuration of a potentiometer.

[Explanation of symbols]

 1 Detection unit 2 Push-pull wire 13 Detection coil 15 Copper plate 31 Injection lever

Claims (1)

[Scope of utility model registration request] 1. A sensor for detecting an angle of a lever for controlling an engine output installed in an engine, the accelerator opening sensor being installed separately from the engine, and the lever and the accelerator opening sensor being connected to each other. And a push-pull wire, wherein one end of the push-pull wire is fixed to a position detection movable part of the accelerator opening sensor, and a detector of the accelerator opening sensor and the position detection movable part are in non-contact with each other. Position detection device.