JPH059245Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> The present invention relates to a control device for an automobile.

<Prior Art> For example, in an automobile internal combustion engine controlled by a control device using a microcomputer, information regarding the opening degree of a throttle valve installed in the intake passage of the internal combustion engine is transmitted to multiple controls. It is often necessary to feed the unit. In such a case, a throttle valve opening detection device, ie, a throttle sensor, is used.

This throttle sensor has a voltage dividing resistor whose one end is connected to a power supply and the other end is grounded, and a slider (voltage divider) that slides on this resistor. It is a potentiometer type that takes out the corresponding output voltage.

Here, FIG. 3 shows the above-mentioned throttle opening detection device.

That is, in the figure, a sliding contact type variable resistor VR linked to a throttle valve of an internal combustion engine
The sensor section 1 is constructed by the following. The voltage divided by the variable resistor VR of this sensor section 1
Vs is introduced into the plurality of control units 2 and 3 as a throttle opening detection voltage.

In the control units 2 and 3, an A/D converter 5 for digitizing the detected voltage Vs is provided together with a control section 4, respectively.

<Problems to be solved by the invention> However, when the voltage detected by one sensor section 1 is supplied to a plurality of control units 2 and 3 in this way, the sensor power supply 6 is supplied as the reference voltage Vref. It is necessary to supply the reference voltage Vref from the sensor power supply 6 supply side to the control unit 3 on the side that does not operate.

In such a configuration, a problem arises in that the harnesses and the like in the control units 2 and 3 become complicated.

The present invention was devised in view of these conventional problems, and eliminates the configuration in which the reference voltage is supplied from the sensor power supply side to the control unit on the side that does not supply the sensor power supply as a reference voltage, thereby solving the above-mentioned conventional problems. The purpose is to eliminate the points.

<Means for Solving the Problems> For this reason, the present invention provides an automobile control device comprising a plurality of control units that respectively control a plurality of control objects based on the output voltage from a potentiometer type sensor. , means for storing the steady-state detection value of the sensor as a full-scale level in a control unit other than the control unit to which the sensor power supply is input as a reference voltage of the sensor; The configuration includes a supplying means.

<Function> In the above configuration, the control units other than the sensor power supply control unit store the full scale level and calculate the output based on the ratio of this level to the value detected by the sensor, thereby adjusting the reference voltage. This means that almost the same accuracy can be ensured as with the method of supplying the control unit with the control unit.

<Example> An example of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, in the control units 13 other than the control unit 2 to which the sensor power supply 6 is input as the reference voltage of the sensor section 1,
As shown in FIG. 2, the steady side detected value by sensor 1, that is, the idle side detected value Vs in the case of a throttle sensor, is stored as a full scale level value Vf (peak hold) means, and the full scale level value is stored as a full scale level value Vf. The control unit 14 is provided with means for supplying a reference voltage to the control unit 13.

In such a control unit 13,
The output is calculated based on the ratio between the full scale level value Vf and the detected value Vs by the sensor unit 1.

Note that the full-scale level value Vf, which is the detection value Vs on the idle side, is stored and updated for each idle, so that a new value is always set.

According to the above configuration, the full-scale level value
By calculating the output from the ratio of Vf to the detection value Vs by the sensor section 1, it is possible to ensure detection accuracy that is approximately equivalent to that achieved by a method in which a reference voltage is supplied to the control unit, and it is possible to avoid the need for a complicated harness as in the conventional method in which the sensor power supply 6 is supplied to each control unit, thereby simplifying the configuration.

Incidentally, in the above embodiments, a description has been given of an automobile control device comprising a plurality of control units that respectively control a plurality of control objects based on the output voltage from a throttle sensor, but the invention is of course limited to this. In short, the present invention can be applied to any automobile control device that is equipped with a plurality of control units that respectively control a plurality of control objects based on the output voltage from a potentiometer type sensor.

<Effects of the invention> As explained above, according to the invention, control units other than the sensor power supply control unit set the steady-state detection value by the sensor to the full-scale level, memorize this value, and use this level. By calculating the output as a ratio to the value detected by the sensor, it is possible to ensure almost the same accuracy as the method of supplying the reference voltage to the control unit, which eliminates the problem of complicating the harness etc. in the control unit. This has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an automobile control device according to the present invention, FIG. 2 is a graph showing sensor characteristics in the same automobile control device, and FIG. 3 is a circuit diagram of a conventional device. DESCRIPTION OF SYMBOLS 1... Sensor part, 2, 3... Control unit, 4... Control part, 5... A/D converter, 6...
...sensor power supply, VR...variable resistor.

Claims (1)

[Scope of utility model registration request] A potentiometer that has a voltage dividing resistor whose one end is connected to the power supply and the other end is grounded, and a voltage divider that slides on this resistor, and extracts an output voltage corresponding to the detected value from the voltage divider. In an automobile control device comprising a plurality of control units that respectively control a plurality of control objects based on the output voltage from a meter-type sensor, the control unit other than the control unit to which the sensor power source is input as the reference voltage of the sensor A control device for an automobile, characterized in that the control unit is provided with means for storing a value detected by the sensor on the steady-state side as a full-scale level, and means for supplying the full-scale level as a reference voltage to the control unit. .