CN108896901B - DCU circuit self-checking system and detection method - Google Patents
DCU circuit self-checking system and detection method Download PDFInfo
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- CN108896901B CN108896901B CN201810436183.XA CN201810436183A CN108896901B CN 108896901 B CN108896901 B CN 108896901B CN 201810436183 A CN201810436183 A CN 201810436183A CN 108896901 B CN108896901 B CN 108896901B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
Abstract
The invention discloses a DCU circuit self-checking system and a DCU circuit self-checking method, wherein the DCU circuit self-checking system comprises: the system comprises a detection circuit, a BDM tool and an off-line detector (EOL) which are connected with the DCU, and an upper computer which is in communication connection with the DCU through the off-line detector (EOL); the BDM tool is connected with the upper computer; the invention has the beneficial effects that: the monitoring system can automatically detect whether the input end and the output end of the circuit board have welding problems before the DCU circuit board is mounted with the shell, and the singlechip chip has faults, thereby solving the detection limit deviation of the circuit board caused by element faults and the vehicle reworking phenomenon caused by finding the DCU problems after the DCU circuit board is mounted with the shell and the vehicle.
Description
Technical Field
The invention relates to the technical field of detection of a DCU circuit board of a commercial vehicle, in particular to a DCU circuit self-checking system before shell installation and a detection method.
Background
As the electric control technology of the commercial vehicle is developed rapidly, various electric control DCU circuit boards need to be subjected to circuit detection, particularly input and output detection before being mounted on the vehicle to ensure that an electric control unit is mounted to work normally.
At present, the SCR state V gas-assisted DCU circuit board is taken as an example, and the shell can be installed after the BOOTLOADER is brushed in, so that whether the input end and the output end of the circuit board have problems or not can be judged on a vehicle only after the whole vehicle is brushed in the APP. And because the circuit board welding inevitably has the defective rate, and unqualified circuit board reforms from new after discovering very troublesome, so need a set of DCU circuit board to reform the equipment in earlier stage and detect before DCU shell mounting.
Disclosure of Invention
In order to detect the DCU circuit board before the DCU is mounted on the whole vehicle and avoid the situation that the unqualified circuit board is found and needs to be remade again after the vehicle is mounted, the invention provides a DCU circuit self-inspection system and a detection method for performing circuit board self-inspection before housing and detecting each input/output end of the circuit board.
In order to achieve the above object, the present invention provides a DCU circuit self-test system, including: the system comprises a detection circuit, a BDM tool and an off-line detector (EOL) which are connected with the DCU, and an upper computer which is in communication connection with the DCU through the off-line detector (EOL); the BDM tool is connected with the upper computer;
the upper computer: the system is used for communicating with an offline detector (EOL) to send a detection instruction to the DCU, and receiving an offline detector (EOL) to send a detection CAN message after the self-detection program is finished;
the BDM tool: for flashing the detection program to the DCU;
the end of line detector (EOL): the CAN message detection device is used for sending a detection instruction to the DCU and sending a detection CAN message to the upper computer;
the detection circuit: for connecting to the DUC board in a loop and for sequentially testing the switches of the DCU board in response to a test program.
The detection circuit comprises at least four switching circuits which are corresponding to the output control end of the DCU and are composed of NPN triodes, and the load resistance of each switching circuit is connected with a voltage division circuit composed of a plurality of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop. The detection circuit also comprises at least three voltage transmission circuits which are corresponding to the output control end of the DCU and are composed of current-limiting resistors, and the voltage transmission circuits are connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop.
The self-inspection system further comprises an integrated inspection harness for the DCU to connect the inspection circuitry, BDM tool and an off-line inspection instrumentation (EOL); the integrated detection wire harness comprises a main wire harness and three branch wire harnesses, wherein one end of the main wire harness is connected with the DCU through a plug connector female end, the three branch wire harnesses are connected with the main wire harness, the three branch wire harnesses are connected with the detection circuit through a JTAG interface female end, connected with a BDM tool through an interface and connected with an offline detector (EOL) through an OBD II female end.
In order to better achieve the above object of the invention, the present application further provides a detection method for a DCU circuit self-test, where the detection method specifically includes:
step S1: connecting an upper computer with a DCU (digital communication unit) through a BDM (brain-based mass spectrometer) tool and an offline detector (EOL), and connecting a detection circuit with the DCU;
step S2: the upper computer initializes the DCU through the BDM tool;
step S3: the upper computer detects the DCU through an off-line detector (EOL), and the detection steps are as follows:
step S301: the upper computer sends an interrupt signal and sends a security authentication interrupt signal to the DCU through a lower limit detector (EOL), if the upper computer successfully shakes hands with the DCU, the step S302 is carried out, and if the upper computer does not successfully shake hands with the DCU, the shaking information interaction is carried out again;
step S302: detecting whether the upper computer sends a self-checking starting command or not by using a lower limit detector (EOL), and sequentially detecting the core functions of the DCU circuit board if the lower limit detector (EOL) receives the self-checking command;
step S303: if the detection result of any core function is abnormal, combining messages by an offline detector (EOL) and sending the messages to an upper computer, and returning to the step S302; if all the core function detection results are normal, sequentially detecting the ATD input ends of the DCU circuit board;
step S304: if all ATD input ends of the DCU circuit board have problems, combining messages by an offline detector (EOL) and sending the combined messages to an upper computer, and returning to the step S302; if one or more than one ATD input end is detected to be normal, detecting all output ends by using the ATD input end with the first detection result being normal, synthesizing the detection results of the ATD input end and the output end into a message and sending the message to the upper computer, and returning to the step S202;
step S305, when the offline detector (EOL) detects an interrupt self-checking command sent by the upper computer, the whole detection process is finished.
Wherein, the step S301 specifically includes: the upper computer sends first handshake information to the DUC through an offline detector (EOL), the DUC receives the first handshake information and analyzes through an algorithm to obtain an analysis result, the analysis result is sent back to the upper computer, the upper computer verifies whether the analysis result is correct, if the analysis result is correct, handshake success information and subsequent matching codes are sent again, and after receiving the handshake success information, the DCU compares the subsequent matching codes and then carries out subsequent detection steps.
The handshake information is 8 bytes, wherein the first 2 bytes are handshake marks, and the last 6 bytes are random encryption codes; and the analysis result is obtained by the DCU decrypting the random encryption code through an algorithm.
In step S302, the detection of the core function includes detection of a power supply voltage, detection of a device main power supply DCDC output voltage, and detection of a reference state voltage of the CAN line.
In step S304, the detection of the ATD input and output is implemented by a detection circuit connected to the DCU input and output.
The detection circuit comprises at least four switching circuits which are corresponding to the output control end of the DCU and are composed of NPN triodes, and the load resistance of the switching circuits is connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop. The detection circuit also comprises at least three voltage transmission circuits which are corresponding to the output control end of the DCU and are composed of current-limiting resistors, and the voltage transmission circuits are connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop.
The DCU is connected with the detection circuit, the BDM tool and an off-line detector (EOL) through an integrated detection harness; the integrated detection wire harness comprises a main wire harness and three branch wire harnesses, wherein one end of the main wire harness is connected with the DCU through a plug connector female end, the three branch wire harnesses are connected with the main wire harness, the three branch wire harnesses are connected with the detection circuit through a JTAG interface female end, connected with a BDM tool through an interface and connected with an offline detector (EOL) through an OBD II female end. The DCU is provided with two speed CAN lines and is connected with an offline detector (EOL), wherein connecting lines connected with the two speed CAN lines in branch wiring bundles of the offline detector are connected with a 120 omega resistor, the two 120 omega resistors are connected in parallel, and the connecting lines connected with the two speed CAN lines are twisted in pairs respectively to play a role in reducing interference.
The invention has the beneficial effects that: the monitoring system can automatically detect whether the input end and the output end of the circuit board have welding problems before the DCU circuit board is mounted with the shell, and the singlechip chip has faults, thereby solving the detection limit deviation of the circuit board caused by element faults and the vehicle reworking phenomenon caused by finding the DCU problems after the DCU circuit board is mounted with the shell and the vehicle.
Drawings
Fig. 1 is a block diagram showing the structures of embodiments 1 and 2 of the present invention.
Fig. 2 is a circuit diagram of a detection circuit in embodiments 1 and 2 of the present invention.
Fig. 3 is a schematic structural view of an integrated inspection harness in embodiments 1 and 2 of the present invention.
Fig. 4 is a flow chart of embodiment 2 of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
Example 1 self-test System
An embodiment of the present invention provides a DCU circuit self-inspection system, and referring to fig. 1, the self-inspection system includes: the system comprises a detection circuit, a BDM tool and an off-line detector (EOL) which are connected with the DCU, and an upper computer which is in communication connection with the DCU through the off-line detector (EOL); the BDM tool is connected with the upper computer;
the upper computer: the system is used for communicating with an offline detector (EOL) to send a detection instruction to the DCU, and receiving an offline detector (EOL) to send a detection CAN message after the self-detection program is finished;
the BDM tool: for flashing the detection program to the DCU;
the end of line detector (EOL): the CAN message detection device is used for sending a detection instruction to the DCU and sending a detection CAN message to the upper computer;
the detection circuit: for connecting to the DUC board in a loop and for sequentially testing the switches of the DCU board in response to a test program.
The detection circuit comprises at least four switching circuits which are corresponding to the output control end of the DCU and are composed of NPN triodes, and the load resistance of each switching circuit is connected with a voltage division circuit composed of a plurality of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop. The detection circuit also comprises at least three voltage transmission circuits which are corresponding to the output control end of the DCU and are composed of current-limiting resistors, and the voltage transmission circuits are connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop. Referring to fig. 2, the output end states of the DCU circuits are different, and may be direct output or DCU end is a switch MOS transistor or triode output, and now, taking 3-way direct output, 4-way DCU end operation MOS transistor output, and 7-way ATD input as an example, the circuit diagram is shown in fig. 2, where the resistance value of the base resistor of the triode in the switch circuit is 6.8k Ω, the resistance value of the parallel resistor between the base and the emitter is 2k Ω, and the load resistance of the collector is 1k Ω; the voltage dividing circuit is composed of two resistors with the resistance value of 1k omega. Because the input end ATD of the DUC circuit is provided with a pull-up resistor, a power supply end is not required to be additionally arranged for the detection circuit; the accuracy of the load resistance of the collector and the two voltage dividing resistances of the voltage dividing circuit is less than 1%.
Referring to fig. 3, the self-test system further includes an integrated test harness for the DCU to connect the test circuit, BDM tool and an off-line detector (EOL); the integrated detection wire harness comprises a main wire harness and three branch wire harnesses, wherein one end of the main wire harness is connected with the DCU through a plug connector female end, the three branch wire harnesses are connected with the main wire harness, the three branch wire harnesses are connected with the detection circuit through a JTAG interface female end, connected with a BDM tool through an interface and connected with an offline detector (EOL) through an OBD II female end.
Example 2 detection method
Referring to fig. 4, an embodiment of the present invention provides a detection method for a DCU circuit self-test, where the detection method specifically includes:
step S1: connecting an upper computer with a DCU (digital communication unit) through a BDM (brain-based mass spectrometer) tool and an offline detector (EOL), and connecting a detection circuit with the DCU;
step S2: the upper computer initializes the DCU through the BDM tool;
step S3: the upper computer detects the DCU through an off-line detector (EOL), and the detection steps are as follows:
step S301: the upper computer sends an interrupt signal and sends a security authentication interrupt signal to the DCU through a lower limit detector (EOL), if the upper computer successfully shakes hands with the DCU, the step S302 is carried out, and if the upper computer does not successfully shake hands with the DCU, the shaking information interaction is carried out again;
step S302: detecting whether the upper computer sends a self-checking starting command or not by using a lower limit detector (EOL), and sequentially detecting the core functions of the DCU circuit board if the lower limit detector (EOL) receives the self-checking command;
step S303: if the detection result of any core function is abnormal, combining messages by an offline detector (EOL) and sending the messages to an upper computer, and returning to the step S302; if all the core function detection results are normal, sequentially detecting the ATD input ends of the DCU circuit board;
step S304: if all ATD input ends of the DCU circuit board have problems, combining messages by an offline detector (EOL) and sending the combined messages to an upper computer, and returning to the step S302; if one or more than one ATD input end is detected to be normal, detecting all output ends by using the ATD input end with the first detection result being normal, synthesizing the detection results of the ATD input end and the output end into a message and sending the message to the upper computer, and returning to the step S202;
step S305, when the offline detector (EOL) detects an interrupt self-checking command sent by the upper computer, the whole detection process is finished.
Wherein, the step S301 specifically includes: the upper computer sends first handshake information to the DUC through an offline detector (EOL), the DUC receives the first handshake information and analyzes through an algorithm to obtain an analysis result, the analysis result is sent back to the upper computer, the upper computer verifies whether the analysis result is correct, if the analysis result is correct, handshake success information and subsequent matching codes are sent again, and after receiving the handshake success information, the DCU compares the subsequent matching codes and then carries out subsequent detection steps.
The handshake information is 8 bytes, wherein the first 2 bytes are handshake marks, and the last 6 bytes are random encryption codes; and the analysis result is obtained by the DCU decrypting the random encryption code through an algorithm.
In step S302, the detection of the core function includes detection of a power supply voltage, detection of a device main power supply DCDC output voltage, and detection of a reference state voltage of the CAN line. In order to ensure that the circuit board cannot generate a safety problem in the detection process, the core functions need to be detected in sequence according to the safety importance level, and as long as a problem of one core function is detected, the core function needs to jump out to a merged message and send the merged message to an upper computer; because of the problem with one of the core functions, subsequent testing is necessarily problematic or may even cause subsequent hardware damage. And the safety certification and the combined message are added into a communication protocol of the offline detector and the upper computer.
In step S304, the detection of the ATD input and output is implemented by a detection circuit connected to the DCU input and output. The detection circuit comprises at least four switching circuits which are corresponding to the output control end of the DCU and are composed of NPN triodes, and the load resistance of each switching circuit is connected with a voltage division circuit composed of a plurality of paths of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop. The detection circuit also comprises at least three voltage transmission circuits which are corresponding to the output control end of the DCU and are composed of current-limiting resistors, and the voltage transmission circuits are connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors; and the voltage output end of the voltage division circuit is connected with the input port of the DCU to form a signal transmission loop. Referring to fig. 2, the output end states of the DCU circuits are different, and may be direct output or DCU end is a switch MOS transistor or triode output, and now, taking 3-way direct output, 4-way DCU end operation MOS transistor output, and 7-way ATD input as an example, the circuit diagram is shown in fig. 2, where the resistance value of the base resistor of the triode in the switch circuit is 6.8k Ω, the resistance value of the parallel resistor between the base and the emitter is 2k Ω, and the load resistance of the collector is 1k Ω; the voltage dividing circuit is composed of two resistors with the resistance value of 1k omega. Because the input end ATD of the DUC circuit is provided with a pull-up resistor, a power supply end is not required to be additionally arranged for the detection circuit; the accuracy of the load resistance of the collector and the two voltage dividing resistances of the voltage dividing circuit is within 1%.
Referring to fig. 3, the DCU is connected to the detection circuitry, BDM tool and end of line instrumentation (EOL) via an integrated detection harness; the integrated detection wire harness comprises a main wire harness and three branch wire harnesses, wherein one end of the main wire harness is connected with the DCU through a plug connector female end, the three branch wire harnesses are connected with the main wire harness, the three branch wire harnesses are connected with the detection circuit through a JTAG interface female end, connected with a BDM tool through an interface and connected with an offline detector (EOL) through an OBD II female end. The DCU is provided with two speed CAN lines and is connected with an offline detector (EOL), wherein connecting lines connected with the two speed CAN lines in branch wiring bundles of the offline detector are connected with a 120 omega resistor, the two 120 omega resistors are connected in parallel, and the connecting lines connected with the two speed CAN lines are twisted in pairs respectively to play a role in reducing interference.
Example 3
The message merging and sending will be described in detail by taking the example of the need to detect three core functions, 7 ATD inputs and 7 outputs. Three core functions, 7 ATD inputs, 7 outputs, and an extension frame is required to be sent out. Wherein canbuf0[0] defines how many bytes of CAN messages are left subsequently, canbuf0[1] and canbuf0[2] are set by a protocol with an upper computer, and canbuf0[3] to canbuf0[7] are specific detection results (which CAN be expanded according to specific detection numbers).
Below is a color legend
The "Byte number of message" indicates that the lower computer tells the upper computer how many messages are valid bytes (including this message) in the following, the upper line is 255, for example, canbuf0[0] is 0x1A, which means that there are 26 bytes in total in addition to this message, and four messages are this communication message (8 bytes in one message).
The canbuf0[1] and the canbuf0[2] are related protocol messages, specifically function descriptions of the messages of the lower computer, namely the messages are transmitted to be used for representing the DCU self-checking condition, and the analysis of upper computer software is facilitated.
All subsequent messages default to FF, each part of detection occupies the size of two bits, namely the state of a certain module A is 0b11 when the module A is not detected, the function defines that each module has 4 states, 0b11 is an undetected state, 0b00 is a detected problematic state, 0b01 is a detected normal state, and 0b10 is a reserved state. Taking the above table as an example, if the value of canbuf0[4] is 0b11000101, it represents that the output terminal 3 is detected normally, the output terminal 4 is detected normally, the output terminal 5 is detected abnormally, and the output terminal 6 is not detected (in the actual process, there is no message that the output terminal has been detected to have undetected, and this example is only for illustration).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A DCU circuit self-checking system, characterized in that, self-checking system includes: the system comprises a detection circuit, a BDM tool and an off-line detector (EOL) which are connected with the DCU, and an upper computer which is in communication connection with the DCU through the off-line detector (EOL); the BDM tool is connected with the upper computer;
the upper computer: the system is used for communicating with an offline detector (EOL) to send a detection instruction to the DCU, and receiving an offline detector (EOL) to send a detection CAN message after the self-detection program is finished;
the BDM tool: for flashing the detection program to the DCU;
the end of line detector (EOL): the CAN message detection device is used for sending a detection instruction to the DCU and sending a detection CAN message to the upper computer;
the detection circuit: the detection device is used for connecting the DCU circuit board into a loop and sequentially detecting each switch of the DCU circuit board in response to a detection program;
the detection circuit comprises at least four switching circuits which are corresponding to the output control end of the DCU and are composed of NPN triodes, and the load resistance of the switching circuits is connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors; the voltage output ends of the voltage division circuits are connected with the input port of the DCU to form a signal transmission loop; the detection circuit also comprises at least three voltage transmission circuits which are corresponding to the output control end of the DCU and are composed of current-limiting resistors, and the voltage transmission circuits are connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors;
the detection method of the self-checking system specifically comprises the following steps:
step S1: connecting an upper computer with a DCU (digital communication unit) through a BDM (brain-based mass spectrometer) tool and an offline detector (EOL), and connecting a detection circuit with the DCU;
step S2: the upper computer initializes the DCU through the BDM tool;
step S3: the upper computer detects the DCU through an off-line detector (EOL), and the detection steps are as follows:
step S301: the upper computer sends an interrupt signal and sends a security authentication interrupt signal to the DCU through an offline detector (EOL), if the upper computer successfully shakes hands with the DCU, the step S302 is carried out, and if the upper computer does not successfully shake hands with the DCU, the shaking information interaction is carried out again;
step S302: detecting whether the upper computer sends a self-checking starting command or not by an offline detector (EOL), and if the offline detector (EOL) receives the self-checking command, sequentially detecting the core functions of the DCU circuit board;
step S303: if the detection result of any core function is abnormal, combining messages by an offline detector (EOL) and sending the messages to an upper computer, and returning to the step S302; if all the core function detection results are normal, sequentially detecting the ATD input ends of the DCU circuit board;
step S304: if all ATD input ends of the DCU circuit board have problems, combining messages by an offline detector (EOL) and sending the combined messages to an upper computer, and returning to the step S302; if one or more than one ATD input end is detected to be normal, detecting all output ends by using the ATD input end with the first detection result being normal, synthesizing the detection results of the ATD input end and the output end into a message and sending the message to the upper computer, and returning to the step S302;
step S305: when an offline detector (EOL) detects an interrupt self-checking command sent by an upper computer, the whole detection process is finished;
in step S303, the detecting of the core function includes detecting a power supply voltage, detecting an output voltage of the device main power supply DCDC, and detecting a reference state voltage of the CAN line.
2. The DCU circuit self-test system of claim 1, further comprising an integrated test harness for DCU connection to the test circuit, BDM tool and end of line tester (EOL); the integrated detection wire harness comprises a main wire harness and three branch wire harnesses, wherein one end of the main wire harness is connected with the DCU through a plug connector female end, the three branch wire harnesses are connected with the main wire harness, the three branch wire harnesses are connected with the detection circuit through a JTAG interface female end, connected with a BDM tool through an interface and connected with an offline detector (EOL) through an OBD II female end.
3. A detection method for self-checking of a DCU circuit is characterized by specifically comprising the following steps:
step S1: connecting an upper computer with a DCU (digital communication unit) through a BDM (brain-based mass spectrometer) tool and an offline detector (EOL), and connecting a detection circuit with the DCU;
step S2: the upper computer initializes the DCU through the BDM tool;
step S3: the upper computer detects the DCU through an off-line detector (EOL), and the detection steps are as follows:
step S301: the upper computer sends an interrupt signal and sends a security authentication interrupt signal to the DCU through an offline detector (EOL), if the upper computer successfully shakes hands with the DCU, the step S302 is carried out, and if the upper computer does not successfully shake hands with the DCU, the shaking information interaction is carried out again;
step S302: detecting whether the upper computer sends a self-checking starting command or not by an offline detector (EOL), and if the offline detector (EOL) receives the self-checking command, sequentially detecting the core functions of the DCU circuit board;
step S303: if the detection result of any core function is abnormal, combining messages by an offline detector (EOL) and sending the messages to an upper computer, and returning to the step S302; if all the core function detection results are normal, sequentially detecting the ATD input ends of the DCU circuit board;
step S304: if all ATD input ends of the DCU circuit board have problems, combining messages by an offline detector (EOL) and sending the combined messages to an upper computer, and returning to the step S302; if one or more than one ATD input end is detected to be normal, detecting all output ends by using the ATD input end with the first detection result being normal, synthesizing the detection results of the ATD input end and the output end into a message and sending the message to the upper computer, and returning to the step S302;
step S305: when an offline detector (EOL) detects an interrupt self-checking command sent by an upper computer, the whole detection process is finished;
in step S303, the detecting of the core function includes detecting a power supply voltage, detecting an output voltage of the device main power supply DCDC, and detecting a reference state voltage of the CAN line.
4. The detection method according to claim 3, wherein the step S301 specifically comprises: the upper computer sends first handshake information to the DCU through an offline detector (EOL), the DCU receives the first handshake information and analyzes through an algorithm to obtain an analysis result, the analysis result is sent back to the upper computer, the upper computer verifies whether the analysis result is correct, if the analysis result is correct, the upper computer sends handshake success information and subsequent matching codes again, and after receiving the handshake success information, the DCU compares the subsequent matching codes and then carries out subsequent detection steps.
5. The DCU circuit self-test detection method of claim 4, wherein the handshake information is 8 bytes, wherein the first 2 bytes are handshake marks and the last 6 bytes are random encryption codes; and the analysis result is obtained by the DCU decrypting the random encryption code through an algorithm.
6. The detection method according to any one of claims 3-5, wherein in step S304, the ATD input and output terminals are detected by a detection circuit connected to the input and output terminals of the DCU;
the detection circuit comprises at least four switching circuits which are corresponding to the output control end of the DCU and are composed of NPN triodes, and the load resistance of the switching circuits is connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors; the voltage output ends of the voltage division circuits are connected with the input port of the DCU to form a signal transmission loop; the detection circuit also comprises at least three voltage transmission circuits which are corresponding to the output control end of the DCU and are composed of current-limiting resistors, and the voltage transmission circuits are connected with a voltage division circuit which is composed of a plurality of paths of voltage division resistors.
7. The detection method according to any one of claims 3 to 5, wherein the DCU is connected to the detection circuitry, BDM tool and end of line detector (EOL) via an integrated detection harness; the integrated detection wire harness comprises a main wire harness and three branch wire harnesses, wherein one end of the main wire harness is connected with the DCU through a plug connector female end, the three branch wire harnesses are connected with the main wire harness, the three branch wire harnesses are connected with the detection circuit through a JTAG interface female end, connected with a BDM tool through an interface and connected with an offline detector (EOL) through an OBD II female end.
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