KR920001716B1 - Output signal detector and indicative monitor of automobile engine control - Google Patents

Abstract

The monitor unit measures and displays carburetor control pulses of an engine control apparatus. The monitor unit includes: a constant voltage circuit (10) for converting an input voltage to an operating voltage; a microprocessor (17) for outputting control signals to a driving circuit (19) to drive one of the parts; a wave shaping circuit (12) for shaping control pulse signals; a digital/analogue converter (16) for converting the digital signals processed by the microprocessor (17); to analogue signals an amplifying circuit (15) for amplifying the converted analogue signals; a light emitting diode (21) for displaying the state of the combustion ratio control pulses; and another light emitting diode (23) for displaying the load operation state.

Description

Monitor for output signal measurement and display of automotive engine control system

1 is a front view of the monitor according to the present invention.

2 is a rear view of the monitor according to the present invention.

3 is a block diagram showing the circuit configuration of the monitor according to the present invention.

* Explanation of symbols for main parts of the drawings

1: DUTY / STEP display unit 2: Load operation display unit

3: Digital / analog conversion output clock 4: Function selection switch

5: Load connection terminal 6: Input power terminal

7: Digital / analog conversion output terminal 8: Fuse

9 input power 10 constant voltage circuit

11: air-fuel ratio control pulse signal 12: waveform shaping circuit

13: duty / step change switch 14: digital butter

15: Amplification Circuit 16: Digital / Analog Converter

17 microprocessor 18 digital coefficient indicator selection circuit

19: drive circuit 20: digital coefficient indicator

21: light emitting diode for duty / step switching display 22: oscillator

23: light emitting diode for load action indication 24: terminal for load connection

[Industrial use]

The present invention relates to an auxiliary device for developing an engine control device for a vehicle, and more particularly, for measuring and displaying an output signal of an engine control device for a vehicle that measures and displays a control pulse signal of a carburetor generated from an engine control device. It's about the monitor.

[Background]

Conventionally, the monitor is manufactured by dividing into a monitor for measuring the air load control pulse signal and a monitor for displaying the operating state of the electric load when measuring and displaying the signal generated from the engine control device. The duty control method by duty conversion and the step monitor control method by step motor are applied at a certain frequency. However, the conventional air-fuel ratio signal monitor measures only one control signal among these control methods. Although it was manufactured to be able to do so, the analog method was adopted as the display method.

[Purpose of invention]

The present invention is an improvement of the above-described monitoring system, and displays the duty and stem for measuring and displaying the air-fuel ratio control pulse signal of the Cabretta generated by the engine control unit with digital coefficients and electrical loads such as solenoids installed in the vehicle. It provides the monitor for output signal measurement and display of the engine control device for automobile which can be used as the equipment for data analysis in the development of the engine control device by displaying the operating state of the light emitting diode using the blinking state of the display. There is a purpose.

[Configuration of Invention]

In order to achieve the above object, the present invention provides a duty / step display unit 1 for displaying the duty and stem in digital coefficients, a load operation display unit 2 for displaying the operating state of the electric load, and a digital signal of duty and step. The digital / analog conversion output indicator (3) for displaying the amount converted into the analog signal, the function selection switch (4) for connecting the input power and the analog conversion output, and switching the duty / step measurement function, and the electrical load Load connection terminal (5) for connecting to the monitor, input power terminal (6) for supplying power to the monitor, and digital / digital signal for converting the digital signal displayed on the digital coefficient indicator (20) into an analog signal and supplying it to the recorder. The analog conversion output terminal 7 and the fuse 8 for protecting a circuit from the overvoltage input to a monitor are comprised.

In addition, the present invention, through the constant voltage circuit 10 for converting the input power supply 9 to the system drive power supply, the waveform shaping circuit 12 for converting the air-fuel ratio control pulse signal 11, and the digital buffer 14 The cycle and the conversion state of the air-fuel ratio control pulse signal are measured by the signals according to the on / off state of the duty / step selector switch 13 to be applied, and then the arithmetic processing is performed. Then, the signal for selecting the digital coefficient indicator 20 is digitally selected. A microprocessor 17 which outputs a signal for driving the selected segment of the digital coefficient indicator 20 to the drive circuit 19 while outputting to the coefficient display selecting circuit 18, and the arithmetic processing is performed by the microprocessor 17. A digital / analog converter 16 for converting the converted digital signal into an analog signal, an amplifier circuit 15 for amplifying the analog signal converted by the digital / analog converter 16, and the duty / step selector switch ( 13) On / off depending on the switching state, the duty / step switching light emitting diode 21 for displaying the air-fuel ratio control pulse signal 11 in a blinking state, and on / off depending on the operating state of the load connected to the load connecting terminal 24 It is composed of a light emitting diode 23 for load operation display which is turned off to display the operation state of the load.

[Action]

According to the present invention configured as described above, the duty control signal and the step motor control signal are measured together and processed by the digital display method, and the air-fuel ratio control pulse signal and the operating state of the load are displayed by blinking the light emitting diode.

EXAMPLE

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of a monitor according to the present invention, wherein reference numeral 1 in the drawings denotes a duty / step display unit for displaying the duty and step in digital coefficients, and 2 indicates an operating state of the electrical load. Load operation indicator, 3 is a digital / analog conversion output indicator for displaying the amount of duty and step digital signals converted into an analog signal, and 4 is a connection between input power and analog conversion output, and a duty / step measurement function. It is a function selection switch that can be switched.

2 is a rear view of the monitor according to the present invention, in which reference numeral 5 is a load connection terminal 5 for connecting an electric load to the monitor, 6 is an input power terminal for supplying power to the monitor, and The digital / analog conversion output terminal 8 for converting the digital signal displayed on the digital counter into an analog signal and connecting it to the recorder is a fuse for protecting the circuit from overvoltage input to the monitor.

Next, the operating state of the monitor configured as described above will be described with reference to FIG.

3 is a block diagram showing the configuration of a monitor according to the present invention. First, when an ignition switch is turned on, an automotive battery voltage is applied to a monitor, an engine control device and other battery devices. That is, when the input power source 9 is input to the monitor circuit, the microprocessor 17 is operated by the system driving power source converted in the constant voltage circuit 10 to initialize the monitor program. When the air-fuel ratio control pulse signal 11 generated by the engine control device (not shown) is inputted to the microprocessor 17 after the waveform is shaped through the waveform shaping circuit 12, the microprocessor 17 The digital coefficient is measured by measuring the period and the conversion state of the air-fuel ratio control pulse signal 11 by the signals according to the ON / OFF state of the duty / step selector switch 13 applied through the digital buffer 14. It is processed to indicate Subsequently, when the calculation process is completed by the program, the microprocessor 17 outputs a signal for selecting the digital counter 20 to the digital coefficient display selection circuit 18 to select the digital coefficient display 20 having the corresponding number of digits. Thereafter, a signal for driving a selected segment of the digital coefficient indicator 20 is output through the driving circuit 19. As a result of the repetitive processing of the output signal, the digital coefficient display 20 displays a duty or step between 0 and 100 as a number, and the segment of the upper digit of the 4-digit digital coefficient display 20 controls the step motor. It is a negative (-) display counter for setting the initial position of the step motor when the power is turned on in the air-fuel ratio control system of the type. It is not used for duty measurement.

On the other hand, when the digital conversion operation for measuring the air-fuel ratio control pulse signal 11 is finished, the microprocessor 17 converts the digital signal for the processed air-fuel ratio control pulse signal 11 into a digital / analog converter 16. The analog signal is converted into an analog signal, and the waveform corresponding to the duty or step currently displayed on the digital coefficient indicator 20 is passed through the amplifier circuit 15 as an analog signal. Um) will be recorded. At this time, the digital / analog conversion output indicator 3 shown in FIG. 1 serves to represent an analog signal recorded on the recorder as a voltage.

On the other hand, the microprocessor 17 biases the duty / step switching display light emitting diode 21 in the forward or reverse direction to turn on or off according to the switching state of the duty / step switching switch 13 to turn on / off the air-fuel ratio control pulse signal 11 ), And the LED display 23 for operation indication connected to the load connection terminal 24 is turned on or off in accordance with the operation state of the various loads connected to the load connection terminal 24. By doing so, it displays the operating state of the electric load such as various engine control solenoids and lamps installed in the vehicle.

[Effects of the Invention]

According to the present invention described above, the air / fuel ratio control pulse signal is measured by a switch that can select a step motor step in addition to the duty of a constant frequency to measure and display the carburetor air-fuel ratio control pulse signal by the engine controller. In addition, the digital coefficient can be displayed and the operation state of the electric load such as the solenoid installed in the vehicle can be confirmed by the blinking signal of the light emitting diodes on and off.

Claims (2)

A duty / step display unit 1 for displaying the duty and step in digital coefficients, a load operation display unit 2 for displaying the operating state of the electrical load, and an amount for converting the digital signals of the duty and step into analog signals Digital / analog conversion output clock (3), function selection switch (4) for switching input power and analog conversion output and switching of duty / step measurement functions, and load connection terminal for connecting an electric load to the monitor (5), an input power supply terminal 6 for supplying power to the monitor, and a digital / analog conversion output terminal 7 for converting the digital signal displayed on the digital coefficient indicator 20 into an analog signal and supplying it to the recording system. And a fuse (8) for protecting the circuit from overvoltage input to the monitor. Duty / step applied through the constant voltage circuit 10 for converting the input power source 9 into a system driving power source, the waveform shaping circuit 12 for waveform shaping the air-fuel ratio control pulse signal 11, and the digital buffer 14. The period and conversion state of the air-fuel ratio control pulse signal is measured by the signal according to the on / off state of the switching switch 13, the associative processing is performed, and the signal for selecting the digital coefficient indicator 20 is converted into a digital coefficient indicator selection circuit ( 18, a microprocessor 17 for outputting a signal for driving a selected segment of the digital coefficient indicator 20 to a drive circuit 19, and a digital signal calculated by the microprocessor 17 as an analog. In the switched state of the digital / analog converter 16 for converting into a signal, the amplifier circuit 15 for amplifying the analog circuit changed by the digital / analog converter 16, and the duty / step selector switch 13;The on / off switching of the duty / step switching light emitting diode 21 which displays the air-fuel ratio control pulse signal 11 in a flashing state and the load connected to the load connection terminal 24 is performed. A monitor for output signal measurement and display of an engine control apparatus for a vehicle, characterized in that it comprises a light emitting diode (23) for load operation indication for displaying the operation state of the vehicle.

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