CN111308391A - Automobile wire harness conduction detection circuit - Google Patents
Automobile wire harness conduction detection circuit Download PDFInfo
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- CN111308391A CN111308391A CN202010146082.6A CN202010146082A CN111308391A CN 111308391 A CN111308391 A CN 111308391A CN 202010146082 A CN202010146082 A CN 202010146082A CN 111308391 A CN111308391 A CN 111308391A
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Abstract
The invention discloses an automobile wire harness conduction detection circuit which comprises a unit board, a main board, an on-off detection circuit, a voltage comparison circuit, a voltage detection circuit and a power supply circuit, wherein the unit board and the main board are respectively connected with a JTAP circuit, an RS485 circuit, a reset circuit, an MCU decoupling circuit and a crystal oscillator circuit, and the power supply circuit is respectively and electrically connected with the main board and the unit board.
Description
Technical Field
The invention relates to the technical field of harness conduction detection, in particular to an automobile harness conduction detection circuit.
Background
With the rapid development of science and technology, electronic devices are almost ubiquitous, and wiring harnesses are just like the nerve veins of human bodies, and complex signals and instructions are transmitted to all parts. The safety and reliability of the wire harness are of great importance, and how to position, diagnose and trace the fault of the wire harness is a concern in the wire harness detection industry.
The traditional automobile wire harness electrical detection method judges the on-off of the automobile wire harness by observing whether electric, sound and optical signals exist or not in a point-by-point lap joint mode by means of indicating lamps, multimeters, buzzers and other tools.
Disclosure of Invention
The invention aims to provide an automobile wire harness conduction detection circuit to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an automobile wire harness conduction detection circuit, includes cell board, mainboard, break-make detection circuitry, voltage comparison circuit, voltage detection circuitry, power supply circuit, JTAP circuit, RS485 circuit, reset circuit, MCU decoupling circuit, crystal oscillator circuit are connected respectively to cell board and mainboard, power supply circuit electric connection mainboard and cell board respectively, serial circuits is connected to the mainboard, STM32 is adopted to cell board and mainboard model.
Preferably, the cell board is connected with the on-off detection circuit through a 74HC595 circuit, the on-off detection circuit is connected with the cell board through a 74HC165 circuit, the cell board is connected with the voltage comparison circuit in a bidirectional mode, the voltage comparison circuit is connected with the voltage detection circuit in a bidirectional mode, the voltage detection circuit is connected with the multi-path analog switch circuit in a bidirectional mode, and the multi-path analog switch circuit is connected with the on-off detection circuit.
Preferably, the conduction detection circuit mainly comprises a serial port-to-parallel port circuit, a parallel port-to-serial port circuit and a voltage detection circuit, the serial port-to-parallel port circuit comprises 8 cascaded HC595 chips, the parallel port-to-serial port circuit comprises 8 cascaded HC156 chips, and the voltage detection circuit comprises 64 MOS transistors.
Preferably, the voltage detection circuit comprises a first digital-to-analog converter, a second digital-to-analog converter, a first double-circuit voltage comparator and a second double-circuit voltage comparator, wherein the output end of the first digital-to-analog converter is connected with one end of a resistor A, the other end of the resistor A is respectively connected with one end of a resistor B, one end of a capacitor A and the positive input end of the first double-circuit voltage comparator, the other end of the resistor B is connected with the other end of the capacitor A and is grounded, the output end of the first double-circuit voltage comparator is connected with one end of a resistor C and outputs a high level, and the negative input end of the first double-; the output end of the second digital-to-analog converter is connected with one end of a resistor D, the other end of the resistor D is respectively connected with one end of a resistor E, one end of a capacitor B and the positive electrode input end of a second double-circuit voltage comparator, the other end of the resistor E is connected with the other end of the capacitor B and is grounded, the output end of the second double-circuit voltage comparator is connected with one end of a resistor F and outputs low level, and the negative electrode input end of the second double-circuit voltage comparator is connected with a voltage end.
Preferably, the detection method comprises the following steps:
A. the STM32 in the mainboard sends a 'roll call' instruction to the cell board;
B. the unit board controls the 74HC595 serial port/parallel port circuit to apply different detection signals to the on-off detection circuit, and the detection result is returned to the unit board through the 74HC165 serial port/serial port circuit, so that the unit board responds to the mainboard, and closed-loop control is realized;
C. the channel circuits in the multi-channel analog switch circuit are all provided with resistors with different resistance values, so that the resistor measurement in various voltage measurement ranges is realized.
Preferably, the conduction detection circuit detection method is as follows:
A. the STM32 analyzes the upper computer command, applies high and low levels to the grid of the MOS tube through the HC595 chip, and the detected wire harness is connected to an output point OUT;
B. the HC165 chip feeds back the high and low points of the detection point OUT to the STM32 so as to finish the acquisition of the detection voltage of the wiring harness;
C. the CTRH0 and the CTRH1 … … CTRH63 carry OUT high-end control on the MOS tube 203, the CTRL0 and the CTRL1 … … CTRL63 carry OUT low-end control on the MOS tube, and the OUT0 and the OUT1 … … OUT63 are level detection points, so that 64 points can be detected by one cell board;
D. if two ends of a detected wire harness are connected with two points of OUT0 and OUT63, therefore, high level is input to the high-end drive of the MOS tube of OUT0 during detection, low level is input to the high-end drive of the MOS tubes of other output points, and low level is always input to the low-end drive of the MOS tube 203;
E. OUT0 outputs a high voltage, OUT63 outputs a high voltage if the harness is on, and outputs a low voltage if the harness fails.
Preferably, the voltage comparison method is as follows:
A. comparing the two input voltages by using a two-way voltage comparator, and further outputting a logic level;
B. the analog voltage output by the digital-to-analog converter is the reference voltage of the LM319, and the voltage to be measured is connected with the < - > input end of the LM 319;
C. since LM319 is OC output, so connect pull-up resistance and guarantee the high level to export;
D. the voltage comparison circuit is mainly used for logically comparing the voltage output by the conduction detection circuit with the set reference voltage, and further converting the voltage into a logic level and uploading the logic level to an upper computer system for data operation and storage, so that the detection of the conduction of the wiring harness is realized.
Compared with the prior art, the invention has the beneficial effects that: the invention has simple detection logic and strong universality, 64 paths of conduction detection circuits are connected, and the invention is externally connected with an expandable module and can be suitable for the detection of various types and quantities of wire harnesses.
Drawings
FIG. 1 is a block diagram of the control scheme of the present invention;
FIG. 2 is a schematic diagram of a conduction detection circuit of the present invention;
FIG. 3 is a schematic diagram of a voltage comparison circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: an automobile wire harness conduction detection circuit comprises a unit board 1, a mainboard 2, an on-off detection circuit 3, a voltage comparison circuit 4, a voltage detection circuit 5 and a power supply circuit 6, wherein the unit board 1 and the mainboard 2 are respectively connected with a JTAP circuit 7, an RS485 circuit 8, a reset circuit 9, an MCU decoupling circuit 10 and a crystal oscillator circuit 11, the power supply circuit 6 is respectively and electrically connected with the mainboard 2 and the unit board 1, the mainboard 2 is connected with a serial port circuit 12, and models of the unit board 1 and the mainboard 2 adopt STM 32; the unit board 1 is connected with the on-off detection circuit 3 through a 74HC595 circuit 13, the on-off detection circuit 3 is connected with the unit board 1 through a 74HC165 circuit 14, the unit board 1 is connected with the voltage comparison circuit 4 in a bidirectional mode, the voltage comparison circuit 4 is connected with the voltage detection circuit 5 in a bidirectional mode, the voltage detection circuit 5 is connected with the multi-path analog switch circuit 15 in a bidirectional mode, and the multi-path analog switch circuit 15 is connected with the on-off detection circuit 3.
In the invention, the conduction detection circuit mainly comprises a serial port-to-parallel port circuit, a parallel port-to-serial port circuit and a voltage detection circuit, wherein the serial port-to-parallel port circuit comprises 8 cascaded HC595 chips 201, the parallel port-to-serial port circuit comprises 8 cascaded HC156 chips 202, and the voltage detection circuit comprises 64 MOS (metal oxide semiconductor) tubes 203.
In the invention, the voltage detection circuit comprises a first digital-to-analog converter 16, a second digital-to-analog converter 17, a first double-circuit voltage comparator 18 and a second double-circuit voltage comparator 19, wherein the output end of the first digital-to-analog converter 16 is connected with one end of a resistor A1a, the other end of the resistor A1a is respectively connected with one end of a resistor B2a, one end of a capacitor A1B and the positive input end of a first double-circuit voltage comparator 20, the other end of the resistor B2a is connected with the other end of the capacitor A1B and is grounded, the output end of the first double-circuit voltage comparator 20 is connected with one end of a resistor C3a and outputs high level, and the negative input end of the first; the output end of the second digital-to-analog converter 17 is connected with one end of a resistor D4a, the other end of the resistor D4a is connected with one end of a resistor E5a, one end of a capacitor B2B and the positive electrode input end of a second double-circuit voltage comparator 19 respectively, the other end of the resistor E5a is connected with the other end of the capacitor B2B and is grounded, the output end of the second double-circuit voltage comparator 19 is connected with one end of a resistor F6a and outputs low level, and the negative electrode input end of the second double-circuit voltage comparator 19 is connected with a voltage end.
The detection method comprises the following steps:
A. the STM32 in the mainboard sends a 'roll call' instruction to the cell board;
B. the unit board controls the 74HC595 serial port/parallel port circuit to apply different detection signals to the on-off detection circuit, and the detection result is returned to the unit board through the 74HC165 serial port/serial port circuit, so that the unit board responds to the mainboard, and closed-loop control is realized;
C. the channel circuits in the multi-channel analog switch circuit are all provided with resistors with different resistance values, so that the resistor measurement in various voltage measurement ranges is realized.
In addition, the conduction detection circuit detection method of the present invention is as follows:
A. the STM32 analyzes the upper computer command, applies high and low levels to the grid of the MOS tube through the HC595 chip, and the detected wire harness is connected to an output point OUT;
B. the HC165 chip feeds back the high and low points of the detection point OUT to the STM32 so as to finish the acquisition of the detection voltage of the wiring harness;
C. the CTRH0 and the CTRH1 … … CTRH63 carry OUT high-end control on the MOS tube 203, the CTRL0 and the CTRL1 … … CTRL63 carry OUT low-end control on the MOS tube, and the OUT0 and the OUT1 … … OUT63 are level detection points, so that 64 points can be detected by one cell board;
D. if two ends of a detected wire harness are connected with two points of OUT0 and OUT63, therefore, high level is input to the high-end drive of the MOS tube of OUT0 during detection, low level is input to the high-end drive of the MOS tubes of other output points, and low level is always input to the low-end drive of the MOS tube 203;
E. OUT0 outputs a high voltage, OUT63 outputs a high voltage if the harness is on, and outputs a low voltage if the harness fails.
In the invention, the voltage comparison method comprises the following steps:
A. comparing the two input voltages by using a two-way voltage comparator, and further outputting a logic level;
B. the analog voltage output by the digital-to-analog converter is the reference voltage of the LM319, and the voltage to be measured is connected with the < - > input end of the LM 319;
C. since LM319 is OC output, so connect pull-up resistance and guarantee the high level to export;
D. the voltage comparison circuit is mainly used for logically comparing the voltage output by the conduction detection circuit with the set reference voltage, and further converting the voltage into a logic level and uploading the logic level to an upper computer system for data operation and storage, so that the detection of the conduction of the wiring harness is realized.
In conclusion, the detection logic is simple, the universality is strong, 64 paths of detection circuits are conducted, and the detection circuit is externally connected with an expandable module and can be suitable for detection of various types and quantities of wire harnesses.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The utility model provides an automobile wire harness conduction detection circuit, includes cell board (1), mainboard (2), break-make detection circuit (3), voltage comparison circuit (4), voltage detection circuit (5), power supply circuit (6), its characterized in that: JTAP circuit (7), RS485 circuit (8), reset circuit (9), MCU decoupling circuit (10), crystal oscillator circuit (11) are connected respectively to cell board (1) and mainboard (2), power supply circuit (6) electric connection mainboard (2) and cell board (1) respectively, serial circuits (12) are connected in mainboard (2), STM32 is adopted to cell board (1) and mainboard (2) model.
2. The automotive wiring harness conduction detection circuit according to claim 1, characterized in that: the unit board (1) is connected with the on-off detection circuit (3) through a 74HC595 circuit (13), the on-off detection circuit (3) is connected with the unit board (1) through a 74HC165 circuit (14), the unit board (1) is connected with the voltage comparison circuit (4) in two directions, the voltage comparison circuit (4) is connected with the voltage detection circuit (5) in two directions, the voltage detection circuit (5) is connected with the multi-path analog switch circuit (15) in two directions, and the multi-path analog switch circuit (15) is connected with the on-off detection circuit (3).
3. The automotive wiring harness conduction detection circuit according to claim 1, characterized in that: the conduction detection circuit mainly comprises a serial port-to-parallel port circuit, a parallel port-to-serial port circuit and a voltage detection circuit, the serial port-to-parallel port circuit comprises 8 cascaded HC595 chips (201), the parallel port-to-serial port circuit comprises 8 cascaded HC156 chips (202), and the voltage detection circuit comprises 64 MOS (metal oxide semiconductor) tubes (203).
4. The automotive wiring harness conduction detection circuit according to claim 1, characterized in that: the voltage detection circuit comprises a first digital-to-analog converter (16), a second digital-to-analog converter (17), a first double-circuit voltage comparator (18) and a second double-circuit voltage comparator (19), wherein the output end of the first digital-to-analog converter (16) is connected with one end of a resistor A (1a), the other end of the resistor A (1a) is respectively connected with one end of a resistor B (2a), one end of a capacitor A (1B) and the positive electrode input end of the first double-circuit voltage comparator (20), the other end of the resistor B (2a) is connected with the other end of the capacitor A (1B) and is grounded, the output end of the first double-circuit voltage comparator (20) is connected with one end of a resistor C (3a) and outputs high level, and the negative electrode input end of the first double-circuit voltage comparator (; the output end of the second digital-to-analog converter (17) is connected with one end of a resistor D (4a), the other end of the resistor D (4a) is respectively connected with one end of a resistor E (5a), one end of a capacitor B (2B) and the positive input end of a second double-circuit voltage comparator (19), the other end of the resistor E (5a) is connected with the other end of the capacitor B (2B) and is grounded, the output end of the second double-circuit voltage comparator (19) is connected with one end of a resistor F (6a) and outputs low level, and the negative input end of the second double-circuit voltage comparator (19) is connected with a voltage end to be tested.
5. The detection method for realizing the automobile wire harness conduction detection circuit of claim 1 is characterized in that: the detection method comprises the following steps:
A. the STM32 in the mainboard sends a 'roll call' instruction to the cell board;
B. the unit board controls the 74HC595 serial port/parallel port circuit to apply different detection signals to the on-off detection circuit, and the detection result is returned to the unit board through the 74HC165 serial port/serial port circuit, so that the unit board responds to the mainboard, and closed-loop control is realized;
C. the channel circuits in the multi-channel analog switch circuit are all provided with resistors with different resistance values, so that the resistor measurement in various voltage measurement ranges is realized.
6. The automotive wiring harness conduction detection circuit according to claim 3, characterized in that: the detection method of the conduction detection circuit comprises the following steps:
A. the STM32 analyzes the upper computer command, applies high and low levels to the grid of the MOS tube through the HC595 chip, and the detected wire harness is connected to an output point OUT;
B. the HC165 chip feeds back the high and low points of the detection point OUT to the STM32 so as to finish the acquisition of the detection voltage of the wiring harness;
C. the CTRH0 and the CTRH1 … … CTRH63 carry OUT high-end control on the MOS tube 203, the CTRL0 and the CTRL1 … … CTRL63 carry OUT low-end control on the MOS tube, and the OUT0 and the OUT1 … … OUT63 are level detection points, so that 64 points can be detected by one cell board;
D. if two ends of a detected wire harness are connected with two points of OUT0 and OUT63, therefore, high level is input to the high-end drive of the MOS tube of OUT0 during detection, low level is input to the high-end drive of the MOS tubes of other output points, and low level is always input to the low-end drive of the MOS tube 203;
E. OUT0 outputs a high voltage, OUT63 outputs a high voltage if the harness is on, and outputs a low voltage if the harness fails.
7. The automotive wiring harness conduction detection circuit according to claim 4, characterized in that: the voltage comparison method comprises the following steps:
A. comparing the two input voltages by using a two-way voltage comparator, and further outputting a logic level;
B. the analog voltage output by the digital-to-analog converter is the reference voltage of the LM319, and the voltage to be measured is connected with the < - > input end of the LM 319;
C. since LM319 is OC output, so connect pull-up resistance and guarantee the high level to export;
D. the voltage comparison circuit is mainly used for logically comparing the voltage output by the conduction detection circuit with the set reference voltage, and further converting the voltage into a logic level and uploading the logic level to an upper computer system for data operation and storage, so that the detection of the conduction of the wiring harness is realized.
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Cited By (3)
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| CN111781423A (en) * | 2020-07-01 | 2020-10-16 | 南通大学 | On-line resistance value detection circuit and detection method based on conduction test board |
| CN112305453A (en) * | 2020-10-29 | 2021-02-02 | 一汽奔腾轿车有限公司 | Automobile wire harness detection device |
| CN112698244A (en) * | 2020-12-08 | 2021-04-23 | 丹阳众智信息科技有限公司 | Wire harness wireless detection system and method |
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| CN112698244A (en) * | 2020-12-08 | 2021-04-23 | 丹阳众智信息科技有限公司 | Wire harness wireless detection system and method |
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