JPH0726196Y2 - Displacement detection device for accelerator pedal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention detects the depression amount of an accelerator pedal in a driver's seat and program-controls the engine, clutch and transmission of a vehicle using a microcomputer. The present invention relates to a mechanical-electrical conversion device in an automatic shift control device.

〔Overview〕

The present invention relates to a displacement detecting device for an accelerator pedal, which is connected to an accelerator pedal and includes a mechanical-electrical converter for converting mechanical displacement of the accelerator pedal into an electric signal and a control circuit including a microprocessor to which the electric signal is input. , A plurality of non-contact type devices having substantially the same characteristics are linked so as to interlock with an accelerator pedal, and one of the electric signals output by each of the plurality of devices is selected and given to a control circuit. As a result, even if one mechanical-electrical conversion device becomes defective, it can be switched to another mechanical-electrical conversion device and used, so that the vehicle can be continuously driven by an automatic gear shift operation. .

[Conventional technology]

The control circuit including a microprocessor and a memory detects the amount of depression of the accelerator pedal operated by the driver, the rotational speed of the engine, and other vehicle running characteristic data (vehicle speed, position of transmission gear, etc.), respectively, and There is known an automatic transmission that performs the above-mentioned program-controlled operation (for example, Japanese Patent Laid-Open No. 57-44750).

In such a transmission, when the driver depresses the accelerator pedal, the signal from the electromechanical conversion device connected to the accelerator pedal and the running of the vehicle such as the engine speed, the vehicle speed, the position of the transmission gear, etc. A microprocessor program determines the signal from the sensor that detects the state with a microprocessor, and supplies fuel to the engine so as to correspond to the amount of accelerator depression by the driver, disconnects the clutch, and shifts the transmission. Operate automatically according to.

In this case, the electromechanical conversion device for detecting the depression amount of the accelerator pedal is a device for issuing a first important control signal for operating these control systems.

Therefore, in the unlikely event that this device fails, the automobile cannot run at all.

[Problems to be solved by the invention]

However, as disclosed in the above-mentioned publication, in the conventional technique, only one mechanical-electrical conversion device is connected to the accelerator pedal, and the mechanical-electrical conversion device is of a contact type, and its reliability is not extremely high. If this device malfunctions, the automatic gear shift operation of the vehicle cannot be performed. Therefore, the driver has to drive the vehicle by manual operation of purely mechanical drive, which is very troublesome.

Especially for large vehicles such as trucks and buses running on highways, the difficulty of operation when automatic gear shifting is disabled due to the failure of the mechanical-electrical converter connected to the accelerator pedal is the same as that for small vehicles. There are different and much higher ones.

The present invention solves this drawback and provides an accelerator pedal displacement detection device that guarantees fail-safe control by allowing automatic shift control of an automobile to continue by performing automatic or simple operations even in such a situation. The purpose is to provide.

[Means for solving problems]

The present invention comprises a mechanical-electrical converter connected to an accelerator pedal and converting a mechanical displacement due to depression of the accelerator pedal into an electric signal, and a control circuit including a microprocessor for inputting the electric signal. A displacement detecting device for an accelerator pedal in an automobile having an automatic transmission having means for controlling the fuel injection amount of the engine, disengaging the clutch, and program-controlling the transmission based on an electric signal obtained by converting the depression amount of the accelerator pedal. In the above, the electromechanical conversion device is composed of a non-contact variable resistance device that converts a mechanical displacement into an electric signal by a reactor, and a plurality of devices having substantially the same characteristics are connected so as to interlock with the accelerator pedal, A switching circuit for selecting one of the output electric signals of the plurality of devices and giving it to the control circuit is provided. And it said that there were pictures.

The control circuit controls the switching circuit when the electric signal input during the operation of the device is out of the range of preset conditions, and automatically controls the output electric signal of another mechanical-electrical conversion device. It is preferable to include.

Further, it is preferable that the output electric signal of the electromechanical conversion device is a voltage signal, and the set condition range is a voltage range.

[Action]

A plurality of non-contact type mechanical-electrical converters having the same characteristics for converting mechanical displacement of the accelerator pedal into an electric signal are connected to the accelerator pedal, and one of the plurality of output electric signals is selected. Take in. Even if one electromechanical conversion device fails, it can be used by switching to another device, so that the operation of the vehicle can be continued without any trouble. This switching operation can be performed manually or automatically.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of the first embodiment of the present invention.

In the figure, a mechanical-electrical converter 2A is connected to a rod portion 1A of an accelerator pedal 1 by a lever 3A. When the driver steps on the accelerator pedal 1 in the direction of arrow a, the rod portion 1A is displaced in the direction of arrow b. The displacement by the accelerator pedal is configured to give the lever 3A a mechanical displacement in the direction of arrow c.

The electrical signal output of the electromechanical conversion device 2A is connected to the microprocessor 6 including the memory 7 via the interface 5. At this time, an electric signal corresponding to the depression amount of the accelerator pedal 1 of the driver, that is, the magnitude of the mechanical displacement of the lever 3A is transmitted to the microprocessor 6, and this displacement amount is used to measure the driving characteristics of the vehicle such as the engine speed sensor 8B. The microprocessor 6 controls the fuel injection device 8A of the engine 8 according to the data stored in the memory 7 and the comparison of the conditions of FIG.
Control the selection and shift of.

Here, the feature of the present invention is a non-contact type mechanical-electrical conversion device, and another mechanical-electrical conversion device 2B having substantially the same characteristics as the mechanical-electrical conversion device 2A is connected via a lever 3B to an accelerator pedal. It is connected so as to interlock with one rod portion 1A. The manual switch 4, which is a switching circuit, selectively supplies an electric signal of one of the two electromechanical conversion devices 2A and 2B to the microprocessor 6.

Since the electromechanical conversion devices 2A and 2B have almost the same characteristics and are connected to the same rod portion 1A via the levers 3A and 3B having the same shape, the arrow c of each lever is used.
The movements of and d are identical. Therefore, accelerator pedal 1
Two electromechanical converters 2A and 2B by the same operation of
The electrical signals respectively input to the microprocessor 6 are practically equal. Therefore, if the output of the electric signal of one of the mechanical-electrical converters becomes defective for some reason, the driver senses this by the display of the indicator light 9 and switches the changeover switch 4, and the vehicle is in the conventional state. You can continue the same driving as.

FIG. 2 shows a block diagram of a second embodiment of the present invention.
FIG. 3 shows a flow chart of this embodiment.

In this embodiment, the electrical signals of the electromechanical conversion devices 2A and 2B are input to the interface 5 and monitored by the microprocessor 6. Microprocessor 6
Uses one of these two electrical signals as an input. At the same time, it is monitored whether the change (voltage change) of the electric signal is within a predetermined range set in advance. When it is detected that one electric signal deviates from this range, the other of the two electric signals is taken in and used as an input.

In this embodiment, the mechanical-electrical converter is automatically switched, so that the driver does not need to perform the switching operation.

In the first and second embodiments, the electromechanical conversion device is specifically a non-contact type variable resistance device (linearx, which converts mechanical displacement into a voltage signal by a reactor,
Displacement detection device of JP-B-55-24043) can be used. In this case, the variable resistance device has a shape in which the resistance value is changed by rotation of the rotary shaft and a linear sliding shape in which a lever-shaped projection is slid, but it is connected to the rod portion of the accelerator pedal. A lever shape is suitable, but any shape is applicable.

When a variable resistance device is used as the electromechanical conversion device, the electric signal is taken out as a voltage signal. In this case, the range of the above-mentioned set conditions is the range of the voltage of this voltage signal.

[Effect of device]

As described above, according to the present invention, even if one of the electromechanical transducers for detecting the mechanical displacement of the accelerator pedal fails, a mechanical electromechanical transducer provided separately has the same characteristics and is manually operated. Or because it can be switched automatically,
It is effective because it enables the driver to continue driving the car without any problems and is extremely reliable and safe.

[Brief description of drawings]

FIG. 1 is a block diagram of the first embodiment of the present invention. FIG. 2 is a block diagram of the second embodiment of the present invention. FIG. 3 is a flow chart of the second embodiment. 1 ... Accelerator pedal, 1A ... Rod part, 2A, 2B ... Mechanical-electrical converter, 3A, 3B ... Lever, 4 ... Changeover switch, 5 ... Interface (1/0), 6 ... Microprocessor (CP)
U), 7 ... Memory (MEM), 8 ... Engine, 8A ... Fuel injection device, 8B ... Engine speed sensor, 9 ... Indicator light, 10 ...
Clutch, 11 ... transmission, 12 ... vehicle shift sensor, a, b,
c, d ... Arrows.

Continuation of the front page (56) References JP-A-57-44750 (JP, A) JP-A-58-154612 (JP, A) JP-A-52-37683 (JP, A) Actual development-Sho 54-153951 (JP , U) Actual public Sho 47-29631 (JP, Y1) Special public Sho 58-29523 (JP, B2)

Claims (3)

[Scope of utility model registration request] 1. A control circuit, comprising: a mechanical-electrical converter connected to an accelerator pedal for converting a mechanical displacement due to depression of the accelerator pedal into an electric signal; and a control circuit including a microprocessor for inputting the electric signal. Is a displacement detection of an accelerator pedal in an automobile having an automatic transmission equipped with means for controlling the fuel injection amount of the engine, disengaging the clutch, and controlling the program of the transmission based on the electric signal obtained by converting the depression amount of the accelerator pedal. In the device, the electromechanical conversion device is a non-contact type displacement detection device that converts mechanical displacement into an electric signal by a reactor, and a plurality of devices having substantially the same characteristics are connected so as to interlock with the accelerator pedal. A switching circuit for selecting one of the output electric signals of a plurality of devices and giving it to the control circuit is provided. A displacement detecting device for an accelerator pedal, which is characterized by being provided. 2. The control circuit controls the switching circuit when the electric signal input during operation of the device is out of the range of preset conditions to automatically output the electric signal of another electromechanical conversion device. The accelerator pedal displacement detecting device according to claim (1), which includes a control means for switching to a utility model. 3. The displacement of the accelerator pedal according to claim (2), wherein the electric signal output from the electromechanical conversion device is a voltage signal, and the set condition range is the voltage range. Detection device.