KR20020022277A - An apparatus for detecting multi-channel 3-state signal and indicating multi-channel digital signal - Google Patents

Abstract

PURPOSE: An apparatus for displaying and detecting a digital three-state signal is provided to determine whether an electronic equipment of a car is normal or not based on an input signal generated from the electronic equipment. CONSTITUTION: A signal input part(10) receives electric signals of on and off forms from relay switches and a pulse train signal from an electric field object of a car. The signal discrimination part(20) discriminates whether an input signal of an electric field object of a car from the signal input part(10) is in an on, off, and open state. A pulse sensing part(30) senses a signal outputted from the signal discrimination part(20). A logic circuit(40) generates a driving signal which is used for displaying on a display in an electronic equipment of a car. An LED(60) receives a driving signal from the logic circuit(40) and visibly displays whether the pulse train signal from an electric field object of a car is normal.

Description

An apparatus for detecting multi-channel 3-state signal and indicating multi-channel digital signal

The present invention relates to a device for detecting a signal required for automobile maintenance, and more particularly, to detect a signal and normal operation of electrical equipment for maintenance of a vehicle. The present invention relates to a three-state signal detection and display device.

In general, a signal measuring instrument used for the maintenance of electrical equipment mounted on a vehicle is generally equipped with a device called an oscilloscope, and such an oscilloscope can easily analyze a waveform of a detection signal on a screen, While it is a useful equipment that allows the user to arbitrarily adjust the period and voltage ratios, the operation is complicated and expensive, and the number of channels is fixed at two or four, and the more channels, the higher the price. have.

In addition, as a signal detector different from such an oscilloscope, a bulb tester is applied for maintenance of an automobile. The bulb tester detects whether a voltage at a measuring point is ON or OFF. Although it has the advantage of being able to check the signal status, the channel is limited to one channel, and when the sensor signal is directly detected in the driving state of the vehicle, the vehicle driving becomes unstable due to the distortion of the sensor signal. In addition, there is a disadvantage in that measurement is difficult for a high speed pulse signal.

On the other hand, in the current vehicle maintenance system, there are many cases where the number of measurement points of the electronic equipment to be measured at the same time is more than four as necessary. For this purpose, it is possible to measure several channels simultaneously while performing the function of an oscilloscope. Although a personal computer-based data collection device is applied as a dedicated device for checking a vehicle, such a personal computer-based device also has disadvantages such as high price and complicated usage.

Accordingly, the present invention has been made to solve the above-mentioned disadvantages, and its object is to realize the normal state or abnormal state of the input signal generated from the electronic parts of the vehicle by a simple operation with simple channel or multi-channel, but at a low price. It is to provide a multi-channel three-state signal detection and display device for realization.

1 is a block diagram showing the overall configuration of a multi-channel three-state signal detection and display device according to the present invention;

2 is a signal waveform diagram showing a waveform as a reference when determining an ON, OFF, and OPEN state of an input signal according to a preferred embodiment of the present invention;

FIG. 3 is a circuit diagram illustrating a detailed configuration of the multi-channel three-state signal detection and display device shown in FIG. 1 according to the present invention.

<Explanation of symbols for main parts of the drawings>

10: signal input unit, 20: signal discriminating unit

30: pulse detection unit, 40: logic circuit unit,

50: frequency divider, 60: LED display,

70: frequency / duty ratio measurement unit, 80: microprocessor,

90: Frequency / duty ratio display part.

In order to achieve the above object, according to the present invention, in the signal detection device for diagnosing the failure of the electrical equipment mounted on the vehicle, the signal input unit for receiving an electrical signal generated from the electrical equipment of the vehicle and the input through the signal input unit A signal discrimination unit for determining a voltage level state of a signal, a pulse detector for detecting a normal pulse signal and an abnormal pulse signal based on a signal output from the signal discriminator, and a detection signal from the pulse detector; A logic circuit unit for logic processing the output signal from the signal discrimination unit to generate a display drive signal for visually displaying the normal and abnormal states of the input signal generated from the electric equipment of the vehicle, and the display drive from the logic circuit. Signal to the input signal generated in the electronics of the vehicle Is configured to the state and the abnormal state to the display unit for displaying a visible provides a third channel state signal detection and display apparatus.

According to the present invention configured as described above, the types of signals required for diagnosing a vehicle failure are continuously ON, OFF, OPEN, and pulsed ON-OFF. ) Is divided into the crossing signal of ON, OPEN, and OFF of OPEN, and the normal or abnormal state of the input signal is determined by the signal discrimination operation and the pulse detection operation. By discriminating through, it is possible to visually display by using the LED display element and the segment display element.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

That is, FIG. 1 is a block diagram showing the overall configuration of a multi-channel three-state signal detection and display device according to the present invention, and FIG. 2 is a diagram showing the ON and OFF of an input signal according to a preferred embodiment of the present invention. ) Is a signal waveform diagram showing a waveform as a reference when determining an open state, and FIG. 3 is a circuit diagram illustrating a detailed configuration of a multi-channel three-state signal detection and display device according to the present invention shown in FIG. 1. It is also.

As shown in FIG. 1, the apparatus of the present invention includes a signal input unit 10, a signal discriminating unit 20, a pulse sensing unit 30, a logic circuit unit 40, a frequency divider 50, and an LED display unit ( 60), the frequency / duty ratio measurement unit 70, the microprocessor 80, and the frequency / duty ratio display unit 90.

In the figure, the signal input unit 10 receives the electrical signals of the ON (OFF) type generated from various relay switches among the electrical equipment mounted inside the vehicle, and the crank position sensor, TDC sensor, A pulse train type signal generated from a fuel injection device or an ignition device is received.

That is, according to the present invention, in addition to the on-off electrical signals and pulse train-type signals among the electrical equipment mounted inside the vehicle, the analog signals from the electrical equipment that generate analog signals such as oxygen sensors and throttle valve position sensors are conventional. Oscilloscopes used as troubleshooting equipment rarely need to detect analog waveforms and determine failures.They can easily determine whether the electrical equipment has failed by measuring the normal status of pulse generation and the normal on / off status of the signal. As such, such analog signals will not be handled.

In addition, the signal discriminating unit 20 is to determine the ON (ON), OFF (OFF) state for the input signal from the electrical equipment of the vehicle input from the signal input unit 10.

According to the ON, OFF, and OPEN states of the input signal determined by the signal discriminating unit 20, as shown in FIG. 2, in the OPEN state, that is, without a signal, as shown in FIG. 2. The input terminal of the signal input unit 10 is designed so that a voltage of 2 V is input to the corresponding signal discriminating unit 20. When the input signal is 2 V, which is a voltage between 1.5 V and 2.5 V, the measurement probe is opened. If the input signal is higher than the ON detection voltage (A) of 2.5V or more, it is determined to be ON, and the OFF detection voltage of the input signal is 1.5V or less. If it is lower than (B), it can be discriminated to the OFF state.

Here, the signal discriminating unit 20 constitutes first and second voltage comparators 20A and 20B for determining the voltage level of the signal input from the signal input unit 10, and the first and second voltages. The output of the comparator 20A, 20B is used to obtain information of ON, OFF, and OPEN states for the input signal.

On the other hand, the first and second voltage comparators 20A, 20B are the present invention, when the input impedance for the electrical equipment of the vehicle input to the signal input unit 10 is large, such as a signal generated from various sensors, the present invention Since the distortion of the signal may occur due to the current of the signal to be measured flowing into the device, it is preferable to apply an op amp having a very large input impedance instead of having a low output impedance.

In FIG. 2, the first and second voltage comparators 20A and 20B of the signal discrimination unit 20 have an ON sense voltage A and an OFF state in the form of a normal pulse signal having the input signal having a frequency. When the (OFF) detection voltage (B) is alternately crossed, as a result of comparing the ON detection voltage (A) and the OFF detection voltage (B) with the input signal, the same frequency as the input signal is obtained. It outputs a pulse signal.

However, when the input signal has an abnormal waveform and the waveform of the pulse crosses an ON state and an OPEN state or when an OFF state and an OPEN state intersect, the signal discrimination is performed. Since a pulse signal is output only from any one of the first and second voltage comparators 20A and 20B of the unit 20, abnormal pulses can be detected through such output information.

In addition, the pulse detection unit 30 is for detecting a signal output according to the signal discrimination operation of the signal discriminating unit 20, as shown in FIG. The first and second pulse detectors 30A and 30B respectively detect signals output from the second voltage comparators 20A and 20B.

In the logic circuit 40, the signals output from the first and second voltage comparators 20A and 20B of the signal discrimination unit 20 and the first and second pulse detectors 30A of the pulse detection unit 30. A driving signal for visually indicating whether the signal to be measured is normal from the electronic device of the vehicle is generated by logic processing the signal outputted from 30B), and the plurality of AND gates as shown in FIG. Equipped with a NOR gate, an Exclusive NOR gate, and an inverter, the output signals S1 and S2 from the first and second voltage comparators 20A and 20B and the first and second pulse detectors 30A and 30B. The output signals S3 and S4 from the logic are respectively processed to open the OPEN detection signal S5, the normal pulse detection signal S6, the abnormal pulse detection signal S7, and the on / off output signal S8. Opening from the first logic circuit portion 40A and the first logic circuit portion 40A that occur (OP) EN) detection signal S5, normal pulse detection signal S6, abnormal pulse detection signal S7, and on / off output signal S8, respectively, and the first and second voltage comparators 20A and 20B. Second logic for outputting a driving signal for driving the LED display unit 60 by receiving and outputting an output signal, that is, an ON detection signal S1 and an OFF detection signal S2. It is comprised including the circuit part 40B.

Here, if the signal to be measured from the electrical equipment of the vehicle is a pulse signal having a frequency, the logic circuit unit 40 inputs the original frequency signal S9 to the frequency divider 50 and divides the frequency divided by 0 to 20 Hz. The frequency division signal (S10) is applied to divide the pulse signal of the frequency that can be measured with the naked eye.

In addition, the LED display unit 60 is to visually indicate whether the signal to be measured from the electrical equipment of the vehicle is normal by receiving the drive signal from the logic circuit unit 40, as shown in FIG. It consists of a red LED (60A) that is turned on when the signal to be turned on (ON), a green LED (60B) that is turned on when the OFF signal (OFF), and a yellow LED (60C) turned on when the open (OPEN) signal.

That is, in the LED display unit 60, the red LED 60A and the green LED 60B are alternately turned on when the signal to be measured from the automotive electronics is a normal pulse signal, and when the abnormal signal is the red LED 60A and green. Only one LED of the LED 60B is continuously lit, while only the yellow LED 60C is continuously lit in the open state in which no signal is applied to the signal input unit 10.

According to the logic of the logic circuit unit 40 for lighting the red LED 60A, the green LED 60B, and the yellow LED 60C of the LED display unit 60, the continuous ON lighting state of the red LED 60A is achieved. S8 Expressed as S1, S6 in the ON state when a normal pulse signal is input. Expressed as S10, the on-on state when an abnormal pulse signal is input is S7. S3 It is represented by S10.

Therefore, the conditions for turning on the red LED 60A are the three conditions (S8). S1, S6 S10, S7 S3 Since it can be expressed by the logical sum of S10), the logical expression for driving the red LED 60A is S8. S1 S6 S10 S7 S3 It can be expressed as S10.

Further, in the condition for turning on the green LED 60B, the continuous off state is S8. Expressed as S2, the off state when a normal pulse signal is input is S6. The off state when abnormal pulse signal is inputted is S7. S3 It is expressed as

Therefore, the conditions for turning on the green LED 60B are the three conditions (S8). S2, S6 , S7 S3 Can be expressed as the logical sum of the logic), so the logic for turning on the green LED 60B is S8. S2 S6 S7 S3 It can be expressed as

On the other hand, since the condition for turning on the yellow LED 60C needs to be considered only that the input signal is in the open state, a logic expression can be expressed by the open detection signal S5 only.

As described above, the logic equation 40 may be simply implemented by applying a logic array chip such as GAL.

In the figure, the frequency / duty ratio measurement unit 70 receives the original frequency signal S9 from the second logic circuit unit 40B, measures the frequency and duty ratio, and stores the measurement result signal S11. It is for output to the microprocessor 80, the microprocessor 70 receives the measurement result signal (S11) from the frequency / duty ratio measuring unit 70 to calculate the frequency and duty ratio of the original frequency signal, A driving control signal S12 for driving the frequency / duty ratio display unit 90 is generated.

The frequency / duty ratio display unit 90 receives detailed driving control signals S12 from the microprocessor 80 and displays detailed information on the original frequency signal to be measured from the vehicle's electrical equipment. In order to display by the value, it is the display driver 90A is driven by receiving the drive control signal (S12) from the microprocessor (S12), and the frequency of the input signal by the drive of the indicator driver (90A) and It consists of a 7 segment indicator 90B for displaying the duty ratio in the form of letters or numbers.

On the other hand, in the present invention having the embodiments as described above, the configuration for signal discrimination, the configuration for the pulse detection, the configuration for logic processing, the steady state and abnormal state of the input signal for the input signal generated from the electrical equipment of the vehicle Although only the state consisting of a single channel has been described by the configuration for visually displaying and the configuration for displaying the frequency and duty ratio of the input signal, it is possible to implement as many channels as possible using such a configuration. Of course it is.

As described above, according to the present invention, the ON, OFF and OPEN states of signals generated from each electronic device at the time of diagnosing the failure of each electronic device mounted on an automobile are determined and visually measured. High-speed pulse waveforms with difficult frequencies are divided by the frequency division circuit so that the vibration state of the pulses can be visually observed by the display element, thereby effectively detecting various signals generated in the vehicle. do.

In addition, since most failure diagnosis can be performed sufficiently without using expensive and complicated equipment such as the conventional oscilloscope or personal computer based data processing device used for the waveform detection of the automobile, The diagnostic device can be implemented with low cost equipment.

In addition, it is possible to easily measure the output signal of the pulse signal having a high frequency or various sensors having a high output impedance, which is difficult to measure by the conventional light bulb tester, and additional addition for expansion to multiple channels It has the effect that multi-channel measurement is possible without spending any expense.

Claims (8)

In the signal detection device for diagnosing the failure of the electrical equipment mounted on the vehicle, A signal input unit configured to receive an electrical signal generated from the electrical equipment of the vehicle; A signal discriminating unit for determining a voltage level state of a signal input through the signal input unit; Pulse detection unit for detecting whether or not the normal pulse of the input signal and the abnormal pulse by the signal output from the signal discriminating unit, A logic circuit unit for generating a display driving signal for visually displaying a normal state and an abnormal state of an input signal generated from the electrical equipment of the vehicle by logically processing the detection signal from the pulse detection unit and the output signal from the signal discrimination unit And, And a display unit for visually displaying a normal state and an abnormal state with respect to an input signal generated in the electrical equipment of the vehicle by the display drive signal from the logic circuit. 2. The multi-channel three-state signal detection method according to claim 1, further comprising a frequency divider for receiving an original frequency signal from the logic circuit unit and dividing a frequency to supply a frequency signal divided into the logic circuit unit. Display. The frequency / duty ratio measurement unit which receives an original frequency signal from the logic circuit and measures frequency and duty ratio, and calculates the frequency and duty ratio by receiving a measurement result signal from the frequency / duty ratio measurement unit. A microprocessor for generating a drive control signal, an indicator driver driven by a drive control signal from the microprocessor, and a segment indicator for displaying the frequency and duty ratio values of the input signal by driving the indicator driver. Multi-channel three-state signal detection and display device comprising a. The apparatus of claim 1, wherein the signal discriminating unit is configured to perform voltage comparison based on three voltage levels having ON, OFF, and OPEN states for signals input from the electronic device of the vehicle. Multi-channel three-state signal detection and display device. The apparatus of claim 2, wherein the signal discrimination unit comprises a plurality of voltage comparators for determining ON, OFF, and OPEN states of the input signal. And the pulse detecting unit comprises a plurality of pulse detectors respectively detecting pulses of an output signal output from the plurality of voltage comparators. 4. The logic circuit according to claim 3, wherein the logic circuit unit logically processes the output signals from the plurality of voltage comparators and the pulse detection signals from the plurality of pulse detectors by a combination of logic gate elements, thereby maintaining a continuous ON state and a normal ON state. And a condition of a logical sum of an abnormal on state, a condition of a constant sum of an off state of a continuous signal and a normal sum of an off state and an abnormal off state, and generating a display driving signal subject to an open state in which no signal is input. Multi-channel three-state signal detection and display device. The display device of claim 4, wherein the display unit comprises: a first color LED which is turned on when a display driving signal from the logic circuit unit is generated under a logical sum of a continuous on state and a normal on state and an abnormal on state; And a second color LED that is turned on under a logical sum of an off state, a normal off state, and an abnormal off state, and a third color LED that is turned on when the display driving signal is generated under an open state. Multi-channel three-state signal detection and display device. 8. The multi-channel three-state signal detection and display device according to any one of claims 1 to 7, wherein a configuration for detecting and displaying an input signal generated in an electronic device of a vehicle is composed of a single channel or a multi-channel.