JPS6365502A - Program controller for automobile - Google Patents

Abstract

PURPOSE:To accurately and uniformly perform a displacement adjustment monitoring an adjusting output signal, by generating the adjusting output signal to the prescribed input value of a mechanical displacement sensor in an adjusting mode. CONSTITUTION:The titled device is constituted so that a light emitting diode 23 is emitted by supplying a voltage between signal lines A and C when an electrical signal (load signal) sent from a load sensor 2 being positioned at a prescribed position, for example, the releasing position of an accelerator pedal, is inputted, in the adjusting mode. It is necessary to display the absolute value of the displacement of a rack 28 accurately by the electrical signal that is the output of the load sensor, because the displacement in mounting generates a control error fixedly. At time of coupling, a lock nut 29 is adjusted and tightened so that the light emitting diode 23 is emitted just at a position where the position of the rack 28, that is the position of the accelerator pedal not shown in figure is set at the prescribed position.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in electronic control devices for automobiles.

The present invention relates to a program control device that uses electrical signals of mechanical displacement as control inputs.

〔overview〕

The present invention provides an adjustment mode in a program control device that captures mechanical displacement as an electric signal and generates a control signal, and in this adjustment mode, an adjustment output signal is generated in response to a predetermined input value of a mechanical displacement sensor. By doing this, when installing or replacing a mechanical displacement sensor, the program control circuit is switched to adjustment mode, and the displacement adjustment can be performed correctly and uniformly while monitoring the adjustment output signal. .

[Conventional technology]

An electronic control device for a car is equipped with a displacement sensor that converts the mechanical displacement of an accelerator pedal into an electrical signal, and the electrical signal output from this displacement sensor is input into a program control circuit to generate a control signal that controls fuel supply to the engine. The device is known. Devices have been developed that capture not only the mechanical displacement of the accelerator pedal but also various mechanical displacements such as the mechanical displacement of the steering wheel operation, the mechanical displacement of the vehicle body with respect to the axle, and generate control signals.

To give an example of the mechanical displacement of the accelerator pedal in these devices, when installing the mechanical displacement sensor and the accelerator pedal, it is necessary to correctly adjust the position of the accelerator pedal and the input displacement of the displacement sensor to connect the two. There is. That is, the amount of displacement of the accelerator pedal must correctly correspond to the electrical signal corresponding to the amount of displacement of the displacement sensor output.

For this reason, conventional installation methods include attaching a special scale to the adjustment setting position of the displacement sensor, or monitoring the electrical signal output of the displacement sensor using a device such as a tester. ing.

[Problem that the invention seeks to solve]

Such conventional methods complicate the work, increase the number of man-hours, and do not necessarily provide accurate and uniform attachment. Particularly, when parts are replaced at a service factory for some reason after the vehicle has been sold, the above-described conventional method may result in the displacement sensor being installed in a position shifted from the position where it indicates the correct amount of displacement. In that case, correct control will not be performed.

The present invention solves this problem, and aims to provide a device that greatly simplifies the adjustment work for mounting a displacement sensor, and allows accurate and uniform installation and adjustment.

[Means for solving problems]

The present invention provides a program control device that receives an electrical signal from a mechanical displacement sensor that generates an electrical signal corresponding to mechanical displacement and generates a control signal. means for switching to an adjustment mode; in the adjustment mode, an adjustment output signal is generated when an electrical signal corresponding to a predetermined displacement of the mechanical displacement sensor is input; and a display means for displaying the adjustment output signal; It is characterized by having an output terminal for connection to.

[Effect]

When adjusting the installation of a displacement sensor, the program control circuit is first switched to adjustment mode. This can be done by providing a switch in the program control circuit, or by performing a specific operation that is different from normal use, such as pressing a switch connected to the control circuit twice, or by setting a short-circuit terminal on the interface of the program control circuit. A good method is to connect a diagnostic connector.

In the adjustment mode, it is monitored that an adjustment output signal is sent from the program control circuit at a predetermined displacement position of the input mechanical device (for example, an accelerator pedal).

Thereby, the mechanical device and the displacement sensor can be connected correctly and uniformly under the conditions in which the device is used.

It is further advantageous if the adjustment output signal is provided as a visual or acoustic display via the interface of the program control circuit.

Although the adjustment output signal may be generated at a correct predetermined position or within its adjustment tolerance range, it is more convenient to generate it before or after the predetermined position so as to indicate the direction in which the adjustment should be made.

〔Example〕

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. In this example, a plurality of sensors are arranged in each part of a diesel engine, and the sensor output signals are input into a program control circuit to control the timing of the diesel engine.

That is, the diesel engine 1 includes a load sensor 2 that converts the opening degree of a fuel supply port into an electrical signal, a rotation sensor 4 that converts an engine rotation signal into an electrical signal, and a fuel injection pump 5.
The injection timing sensor 6 detects the injection timing and generates an electric signal, and these electric signals are inputted to the program control circuit IO via a signal path 8. A control signal is sent from the program control circuit 10 to the signal path 12, and the solenoid valve 1
Enter 4. The solenoid valve 14 adjusts the passing hydraulic pressure according to this control signal and supplies it to the hydraulic actuator 15. The hydraulic actuator 15 controls the rotational phase of the fuel injection pump 5 to control its injection timing.

Here, the installation of the load sensor 2 among the plurality of sensors described above is performed using the program control circuit 1 as a hardware structure.
A signal path 20 is provided from the 0 interface to which an adjustment plug 22 can be connected via a connector 21. That is, by connecting the adjustment plug 22 to the connector 21, the signal lines A and B can be connected.
A light emitting diode 23 is connected between the signal lines A and C. The program control circuit 10 switches to the adjustment mode by shorting the signals IA and B.
An adjustment program prepared separately from the normal control program is executed.

FIG. 2 shows a main part control flowchart related to the adjustment mode of the program control circuit 10.

In the adjustment mode, when an electric signal (load signal) sent by the load sensor 2 is input at a predetermined position, for example, when the accelerator pedal is released, a voltage is applied between signal lines A and C. The light emitting diode 23 is configured to emit light.

FIG. 2 is a cross-sectional structural diagram of the load sensor 2. This load sensor has a structure in which a movable core 27 moves inside a fixed coil 26, and a fuel injection horn rack 28 is attached to the core 27. Coil 26 forms a differential transformer and generates an electrical signal corresponding to the position of rank 28. The problem of the present invention is that this movable core 2
7 and the rack 28. That is, it is necessary for the electrical signal that is the output of the load sensor to correctly display the absolute value of the displacement of the rank 28, and any misalignment in the installation will cause a fixed control error. At the time of this connection, the opening and nut 29 are adjusted and tightened so that the light emitting diode 23 just emits light when the position of the rank 28, that is, the position of the accelerator pedal (not shown) is set at a predetermined position.

With this configuration, the program control circuit 1
In the zero operating state, the correct position of the load sensor 2 can be adjusted and set.

In the above example, one light emitting diode 23 is connected to the adjustment plug 22.
However, as shown in FIG. 3, in addition to the light emitting diode 23, there are also light emitting diodes 33 and
4 may be provided to indicate the direction of the adjustment. In this example, the light emitting diode 23 emits light when the adjustment direction is exactly at the predetermined position, the light emitting diode 33 emits light when the adjustment direction is in the right direction, and the light emitting diode 34 emits light when the adjustment direction is in the left direction.

In addition to the adjustment plug, the present invention can be implemented in various ways, such as using a switch circuit or using an existing display device.

As a display method, in addition to luminescent display, numerical display and acoustic display can be used. In the case of an acoustic display, the operator can perform correct installation by listening to the acoustic signal while viewing the position, without having to look at the display.

Although the above example describes a load sensor that performs timing control of a diesel engine, the present invention can be similarly implemented with respect to a program control system that inputs other mechanical displacements and sends out a control output. Examples of other applications of devices mounted on automobiles include mechanical displacement of an accelerator pedal, mechanical displacement of steering wheel operation, mechanical displacement of a vehicle body relative to an axle, and so on. When two or more of these devices are connected to one control circuit, a changeover switch or mode switching circuit may be provided to sequentially adjust them.

〔Effect of the invention〕

As described above, according to the present invention, the work of mounting the displacement sensor is simplified, and the mounting condition is correct and uniform, and control errors due to poor mounting conditions can be eliminated. The present invention has the effect of reducing the number of man-hours in the mass production process, and also allows correct and uniform installation and adjustment when parts of the displacement sensor are replaced after sales.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart of main parts related to the adjustment mode of the program control circuit. Figure 3 is a structural diagram of the load sensor. FIG. 4 is a diagram showing an example of the display of the adjustment plug. l...Diesel engine, 2...Load sensor, 4...
- Rotation sensor, 5... Fuel injection pump, 6... Injection timing sensor, 8... Signal path, 10... Program control circuit, 12... Control signal path, 14... Solenoid valve , 15... Hydraulic actuator, 20... Signal passage, 21... Connector, 22... Adjustment plug, 2
3... Light emitting diode, 33.34... Light emitting diode that displays the adjustment direction. Patent Applicant Hino Motors Co., Ltd. Agent Patent Attorney Takaku Ide 2 Figure

Claims (1)

[Claims] (1) In a program control device that receives an electrical signal from a mechanical displacement sensor that generates an electrical signal corresponding to mechanical displacement and generates a control signal, the operating mode is adjusted by an external operation to the control mode that generates the control signal. The adjustment mode is configured to generate an adjustment output signal when an electric signal corresponding to a predetermined displacement of the mechanical displacement sensor is input, and the adjustment output signal is displayed on a display means. A program control device for an automobile, comprising an output terminal for connection.