JPS647363Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a control circuit device, in particular, when there are signals of two independent phenomena, a pulse type signal and an analog type signal, each signal is larger than a preset threshold value. The present invention relates to a control circuit device that obtains an output signal in an exclusive OR format corresponding to a combination of small or large numbers.

For example, in a diesel engine, if the engine speed is above a certain value N, the load is greater than a certain value L, and the engine speed is a certain value N
In the following, if the load is less than a certain value L, the actuator is turned off, and if the engine speed is below the certain value N, and the load is above the certain value L, the actuator is turned off. At a certain value N or more of
When the load is below the certain value L, the actuator may be turned on to control the intake air amount of the engine. Now, suppose that the engine speed is detected using a pulse signal of a pulse type, and the load is detected using a DC level voltage using an analog potentiometer.
When expressed by a threshold value X at the pulse frequency and a certain value L regarding the load by a threshold value Y at the DC level voltage, the characteristics shown in FIG. 1 are obtained. That is, the horizontal axis shows the pulse frequency, and the vertical axis shows the DC level voltage measured by the potentiometer. In mode 1, the pulse frequency is above threshold X and the DC level voltage is above threshold Y (load is below a certain value L), and when the pulse frequency is below threshold X and the DC level voltage is below threshold Y (when the load is below The same output as in mode 3 (value L or higher), that is, a signal that turns on the actuator for controlling the intake air amount is output. Mode 2, where the pulse frequency is below threshold X and the DC level voltage is above threshold Y;
Mode 4, in which the pulse frequency is above threshold X and the DC level voltage is below threshold Y, is the same output but an inverted output from modes 1 and 3, that is, the actuator for controlling the intake air volume is turned off. Outputs a signal to

When the pulse type signal and the analog type signal shown in Fig. 1 are set to the threshold values X and Y, there may be a case where it is desired to control the output by changing the output, and a control circuit device having the characteristics shown in Fig. 1 may arise. It may be desirable to achieve this. An object of the present invention is to provide a control circuit device that can realize the control circuit device having the characteristics shown in FIG. 1 by minimizing the number of commercially available integrated circuits. This will be explained below with reference to the drawings.

FIG. 2 shows the circuit configuration of one embodiment of the control circuit device according to the present invention.

In the figure, reference numeral 1 denotes a pulse signal detection circuit which detects the rotation of the engine with a sensor 2 and obtains a pulse-based signal, that is, a pulse signal with a frequency corresponding to the number of rotations of the engine. The pulse signal obtained by the pulse signal detection circuit 1 is waveform-shaped by a waveform shaping circuit 3 centered on an operational amplifier 4, and then converted into a waveform proportional to the frequency by a frequency-voltage conversion circuit 5 centered around an operational amplifier 6. Converted to DC voltage. DC voltage proportional to the engine speed
ex is input to the first comparator circuit 7 composed of an operational amplifier 8, and is determined by the ratio of the combined resistance value of the parallel circuit of resistor Rx and resistor _R19 to the resistance value of resistor _R20 . A reference voltage Ex obtained by proportionally dividing the power supply voltage is compared with the DC voltage ex. If the DC voltage ex inputted to the first comparison circuit 7 is smaller than the reference voltage Ex, the first comparison circuit 7 outputs logic "1",
If it becomes larger than the reference voltage Ex, it outputs logic "0". This logic output is sent to logic circuit 10.
Note that this reference voltage Ex, that is, the threshold value X in FIG. 1 is set by a resistor Rx.

On the other hand, reference numeral 11 is a DC voltage detection circuit, in which the position of the movable piece of the potentiometer 12 is moved according to the engine load, and the DC level voltage ey corresponding to the engine load is detected by the DC voltage detection circuit 1.
Output from 1. However, when the engine load is small, the potentiometer is on the high side, and the DC level voltage ey becomes a higher voltage than when the engine load is large. This analog signal, that is, the DC level voltage ey, is input to a second comparator circuit 13 composed of an operational amplifier 14, and a resistor Ry
The combined resistance value of the parallel circuit with and resistor R ₂₄ , and the resistance
The DC level voltage ey is compared with a reference voltage Ey obtained by proportionally dividing the power supply voltage of the power supply circuit 9 in proportion to the resistance value of _R25 . If the DC level voltage ey input to the second comparison circuit 13 is smaller than the reference voltage Ey, the second comparison circuit 13 outputs logic "1", and if it becomes larger than the reference voltage Ey, it outputs logic "0". .
This logic output is sent to logic circuit 10. Note that this reference voltage Ey, that is, the threshold value Y in FIG.
is set by the resistor Ry.

The logic circuit 10 stores exclusive ORs 15 and 16, one input of the exclusive OR 15 is connected to the second comparison circuit 13, and the other input is connected to the power supply voltage, that is, the logic 1'' is connected, and the exclusive OR 15 is nothing but a negation circuit. The output of the exclusive OR 15, that is, the NOT circuit, is connected to one input terminal of the exclusive OR 16, and the output of the first comparison circuit 7 is connected to the other input terminal. Therefore, (1) the output of the first comparison circuit 7 is logic "0" and the output of the second comparison circuit 7 is logic "0".
When the output of the comparator circuit 13 is logic "0", 1
5 becomes a logic "1", and the output of the logic circuit 10 is a logic "1", which corresponds to mode 1 in FIG.

(2) The output of the first comparator circuit 7 is logic “0” and the output of the second comparator circuit 7 is
When the output of the comparison circuit 13 is logic "1", 1
5, the output of the logic circuit 10 is a logic "0", which corresponds to mode 4 in FIG.

(3) The output of the first comparator circuit 7 is logic “1” and the output of the second comparator circuit 7 is
When the output of the comparator circuit 13 is logic "0", 1
5 becomes a logic "1", and the output of the logic circuit 10 is a logic "1", which corresponds to mode 3 in FIG.

(4) The output of the first comparator circuit 7 is logic “1” and the output of the second comparator circuit 7 is
When the output of the comparison circuit 13 is logic "1", 1
5 becomes a logic "0", and the output of the logic circuit 10 is a logic "0", which corresponds to mode 2 in FIG.

Further, when the logic circuit 10 outputs a logic "1", the display drive circuit 17 energizes the electromagnetic pulse 19 provided in the actuator 18,
This allows the air cylinder 20 to operate.

The control circuit device according to the present invention is not only applied to the control of the diesel engine described above, but also allows signals of two independent phenomena, a pulse type signal and an analog type signal, to each have a preset threshold value X. , Y can be applied to general control devices that require the modes shown in FIG.

As explained above, according to the present invention, the pulse frequency of the pulse signal system and the DC level voltage of the analog signal system are adjusted to the respective thresholds
If both are larger than Y or both are smaller than Y,
If the same logic output is obtained and the pulse frequency of the pulse signal system and the DC level voltage of the analog signal system are both smaller and larger than the respective thresholds X and Y, or a combination of large and small, the above case and The same logical output can be obtained with the logical output reversed. That is, it is possible to obtain the output of the exclusive OR of signals of two phenomena that occur independently.

The control circuit device of the present invention uses two commercially available integrated circuits, one containing four operational amplifiers and the other containing at least two exclusive ORs. The number of components making up the circuit can be reduced, making it possible to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a mode explanatory diagram illustrating exclusive OR of signals of two phenomena occurring independently, and FIG. 2 shows the circuit configuration of an embodiment of a control circuit device according to the present invention. In the figure, 1 is a pulse signal detection circuit, 2 is a sensor,
3 is a waveform shaping circuit, 5 is a frequency-voltage conversion circuit,
7 is a first comparison circuit, 9 is a power supply circuit, 10 is a logic circuit, 11 is a DC voltage detection circuit, 12 is a potentiometer, 13 is a second comparison circuit, 4, 6, 8,
14 is an operational amplifier, 15 and 16 are exclusive ORs,
17 is a drive circuit, 18 is an actuator, 19 is an electromagnetic valve, and 20 is an air cylinder.

Claims (1)

[Claims for Utility Model Registration] A pulse signal detection circuit that extracts a pulse signal with a repetition rate corresponding to the engine rotation speed, and a voltage detection circuit that extracts an analog signal with a signal level that corresponds to the engine load. A control circuit device that generates a control output based on a combination of the repetition rate of the pulse signal and the signal level of the analog signal, comprising: a pulse waveform shaping circuit that shapes the pulse waveform of the pulse signal; a frequency-voltage conversion circuit that converts the frequency of the waveform-shaped pulse signal into direct current; a first frequency-voltage conversion circuit that compares the DC voltage obtained by the frequency-voltage conversion circuit with a reference voltage of a preset threshold;
and a second comparison circuit that compares a reference voltage of a preset threshold with a DC level voltage of the detected analog signal, and the first comparison circuit and the second comparison circuit. Equipped with an exclusive OR circuit that outputs logical values corresponding to each mode related to the four combinations for each of the above threshold values from the output of the 1. A control circuit device characterized in that each signal corresponding to the two phenomena obtains an output signal corresponding to an exclusive OR according to the magnitude of a preset threshold value.