CN111645617B - Wire harness diagnosis system for three electric systems of electric automobile and electric automobile - Google Patents
Wire harness diagnosis system for three electric systems of electric automobile and electric automobile Download PDFInfo
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- CN111645617B CN111645617B CN202010408956.0A CN202010408956A CN111645617B CN 111645617 B CN111645617 B CN 111645617B CN 202010408956 A CN202010408956 A CN 202010408956A CN 111645617 B CN111645617 B CN 111645617B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/0207—Wire harnesses
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- Automation & Control Theory (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a wire harness diagnosis system for a three-electrical-system of an electric vehicle and the electric vehicle, wherein a low-voltage wire harness can be diagnosed by comparing the collected data of a main singlechip and an auxiliary singlechip, the ports are not required to be sequentially measured by a manual multimeter, the probability of missing detection or error detection is low, a large amount of manpower and material resources are saved, the detection efficiency and the detection accuracy are high, and the safety of the vehicle is also improved. In addition, when the low-voltage wiring harness is detected, the low-voltage wiring harness is disconnected with a main loop system of the three-electrical-system and connected with a testing circuit system of the three-electrical-system, and the main loop system and the testing circuit system are not affected with each other, so that the testing circuit system can test the low-voltage wiring harness independently, the influence of the main loop system on the detection precision of the testing circuit system is avoided, and the detection precision is further improved.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a wire harness diagnosis system for a three-electrical-system of an electric automobile and the electric automobile.
Background
With the continuous deterioration of natural environment, the requirements of various industries on environmental protection are higher and higher, and in the automobile industry, whether the exhaust emission of automobiles reaches the standard or not becomes the problem of key attention of users, and the electric automobile becomes the object of key attention of people gradually due to the advantage of environmental protection of the electric automobile. Meanwhile, the safety of the electric vehicle is receiving more and more attention.
The wiring harness on the electric automobile is complicated in wiring, particularly the three-electric system of the electric automobile, the three-electric system of the electric automobile refers to a low-voltage wiring harness communication system connected between a whole controller of the electric automobile and a battery management system and a motor controller respectively, in order to ensure the safety of the electric automobile, the low-voltage wiring harness information of the three-electric system of the electric automobile needs to be tested so as to detect whether faults (such as misconnection, missing connection, virtual connection and the like) exist in a low-voltage wiring connection wiring harness between the three-electric system, the traditional method adopts a universal meter to sequentially measure, but the wiring harness on the three-electric system is very complicated, and the missing detection or the false detection is easily caused, so that the safety of the automobile is influenced, a large amount of manpower and material resources can be wasted, and the detection efficiency and the detection accuracy are low.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, the detection efficiency and the detection accuracy of a connecting wire harness on a three-electrical system are low. Therefore, the invention provides a wire harness diagnosis system for a three-electrical-system of an electric automobile and the electric automobile, and the detection efficiency and the detection accuracy of a connection wire harness on the three-electrical-system are improved.
To solve the above problems, an embodiment of the present invention discloses a wire harness diagnosis system for a three-electrical system of an electric vehicle, the three-electrical system including: vehicle control unit, battery management system and machine controller, vehicle control unit with battery management system with all connect through the low pressure pencil between the machine controller, pencil diagnostic system includes:
the power supply module is respectively connected with the vehicle control unit, the battery management system and the motor controller and used for supplying power;
the detection device comprises a first detection unit and a second detection unit, wherein the first detection unit is connected with the second detection unit, the first detection unit is connected with a first end of the low-voltage wire harness, and the second detection unit is connected with a second end of the low-voltage wire harness;
when the power module is used for testing and supplying power, the first detection unit is used for detecting a first electric signal of the first end, the second detection unit is used for detecting a second electric signal of the second end, the second detection unit transmits the second electric signal to the first detection unit, and the first detection unit is used for comparing the first electric signal with the second electric signal so as to diagnose the low-voltage wiring harness.
By adopting the technical scheme, the vehicle control unit, the battery management system and the motor controller are connected through the low-voltage wire harness, namely, one end of the vehicle control unit is connected with the first end of the low-voltage wire harness, the motor controller and the battery management system are connected with the second end of the low-voltage wire harness, the first detection unit and the second detection unit are respectively connected with the two ends of the low-voltage wire harness, when the second detection unit detects the second electric signal of the second end of the low-voltage wire harness and sends the second electric signal to the first detection unit, the first detection unit compares the first electric signal of the first end of the low-voltage wire harness with the second electric signal, the low-voltage wiring harness is diagnosed according to the difference of the first electric signal and the second electric signal, therefore, by adopting the technical scheme provided by the embodiment of the invention, the manual universal meter is not needed to be adopted to sequentially measure the ports, a large amount of manpower and material resources are saved, and the detection efficiency and the detection accuracy are high.
Further, in some embodiments of the invention, the power module comprises: a normal power supply unit and a test power supply unit;
the normal power supply unit is used for supplying power for the three electric systems of the electric automobile when the three electric systems work normally;
the test power supply unit is used for supplying power for testing a low-voltage wiring harness of the three-electrical-system of the electric automobile;
the normal power supply unit and the test power supply unit are switched through a selector switch.
Further, in some embodiments of the present invention, the normal power supply unit and the test power supply unit are both vehicle-mounted lead-acid batteries, and the vehicle-mounted lead-acid batteries output a power supply voltage of 12V.
Further, in some embodiments of the present invention, the first detection unit and the second detection unit are both a single chip microcomputer.
Further, in some embodiments of the invention,
further, in some embodiments of the present invention, the first detecting unit and the second detecting unit communicate simultaneously through a high-speed bus and a low-speed bus.
Further, in some embodiments of the present invention, the wire harness diagnosis system further comprises: a power distribution circuit and a controller, the power distribution circuit disposed between a first end and a second end of the low voltage wiring harness;
the controller respectively with power module with distribution circuit connects, is used for when power module normally supplies power, control distribution circuit switches on normal power supply unit in the power module with three electric systems of electric automobile when power module tests the power supply, control distribution circuit switches on test power supply unit in the power module with three electric systems of electric automobile.
Further, in some embodiments of the present invention, the power distribution circuit includes a MOS transistor.
Further, in some embodiments of the present invention, the number of the low voltage wire harnesses is determined according to the port numbers of the vehicle control unit, the battery management system, and the motor controller.
Further, an embodiment of the present invention discloses an electric vehicle including the wire harness diagnosis system for a three-electric system of an electric vehicle as mentioned in any one of the above.
Additional features and corresponding advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a wiring harness diagnosis system for a three-electrical-system of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wire harness diagnosis system in an application scenario disclosed in the embodiment of the present invention;
fig. 3 is a schematic circuit structure diagram of a vehicle control unit according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of a power distribution circuit of the vehicle control unit according to the embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a wire harness diagnostic circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a battery management system according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a power distribution circuit of a battery management system according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a power supply circuit of a battery management system according to an embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a motor controller according to an embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a power distribution circuit of a motor controller according to an embodiment of the present invention;
fig. 11 is a schematic circuit diagram of a power supply circuit of a motor controller according to an embodiment of the present invention;
fig. 12 is a schematic circuit structure diagram of a slave-side single chip in an application scenario according to an embodiment of the present invention.
Reference numerals:
10: a vehicle control unit; 11: a battery management system; 12: a motor controller; 13: a power supply module; 14: a first detection unit; 15: a second detection unit; 16: a low voltage wiring harness.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the embodiment of the invention, the main loop circuit system of the three-electrical system is powered by a normal-electricity gear of the lead-acid battery of the automobile, the test circuit system of the three-electrical system is powered by a test gear of the lead-acid battery, the main loop system and the test circuit system of the three-electrical system are integrated on the same circuit board and have independent loops, namely the output of the lead-acid battery is divided into two gear switches, when the gear switches and the main system are closed, all low-voltage wiring harnesses are connected with the circuit board of the main loop system of the three-electrical system, when the switches and the test system of the three-electrical system are closed, the connecting end of the main loop system of the three-electrical system is disconnected, and the low-voltage wiring harnesses are connected with the test circuit system instead, so that the test circuit system can independently diagnose the state of the low-voltage wiring harnesses without influencing the work of the main loop system of the three-electrical system.
In addition, test circuit system feeds back to main singlechip through the voltage acquisition between the terminal of vice singlechip to low pressure pencil one end, and after the voltage of the other end of low pressure pencil was gathered to main singlechip, the data that feeds back vice singlechip are contrasted, judge the break-make of low pressure pencil and the wiring order of low pressure pencil in proper order, and data are convenient for the user through host computer output and are looked over, and it need not artificially adopt the universal meter to measure the port in proper order, has saved a large amount of manpower and materials, and detection efficiency and detection accuracy are all higher.
In order to ensure the safety of the electric vehicle, a low-voltage wire harness information test of the three-electric-system of the electric vehicle is required to detect whether a low-voltage wire connecting wire harness between the three-electric-system has faults (such as misconnection, missing connection, virtual connection and the like). The wire harness on the electric automobile is a connecting component which is formed by pressing a contact terminal punched by a copper material and a wire cable, and then an insulator is pressed by an outer plastic to form a circuit by bundling the wire harness. The traditional detection method for the wire harness adopts a universal meter to sequentially measure, but the wire harness on the three-electrical system is very complex, so that missing detection or error detection is easily caused, the safety of an automobile is affected, a large amount of manpower and material resources can be wasted, and the detection efficiency and the detection accuracy are lower.
Therefore, according to the technical scheme provided by the embodiment of the invention, the low-voltage wiring harness can be diagnosed by comparing the acquired data of the main singlechip and the auxiliary singlechip, the ports are not required to be sequentially measured by adopting a universal meter manually, the probability of missing detection or error detection is low, a large amount of manpower and material resources are saved, the detection efficiency and the detection accuracy are high, and the safety of the automobile is also improved. In addition, when the low-voltage wiring harness is detected, the low-voltage wiring harness is disconnected with a main loop system of the three-electrical-system and connected with a testing circuit system of the three-electrical-system, and the main loop system and the testing circuit system are not affected with each other, so that the testing circuit system can test the low-voltage wiring harness independently, the influence of the main loop system on the detection precision of the testing circuit system is avoided, and the detection precision is further improved.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wire harness diagnosis system for a three-electrical-system of an electric vehicle according to an embodiment of the present invention.
The electric vehicle three-electric system comprises:
the vehicle control unit 10, the battery management system 11 and the motor controller 12 are connected through a low-voltage wire harness 16.
The wire harness diagnosis system includes:
and the power module 13 are respectively connected with the vehicle control unit 10, the battery management system 11 and the motor controller 12 for supplying power.
The first detection unit 14 and the second detection unit 15, the first detection unit 14 and the second detection unit 15 are connected, the first detection unit 14 is connected with a first end of the low-voltage wire harness 16, and the second detection unit 15 is connected with a second end of the low-voltage wire harness 16.
When the power module 13 is used for testing and supplying power, the first detection unit 14 is used for detecting a first electric signal at a first end, the second detection unit 15 is used for detecting a second electric signal at a second end, the second detection unit 15 transmits the second electric signal to the first detection unit 14, the first detection unit 14 is used for comparing the first electric signal with the second electric signal, and the low-voltage wiring harness is diagnosed through the difference between the first electric signal and the second electric signal.
In some embodiments of the present invention, the power module 13 includes a normal power supply unit and a test power supply unit, the normal power supply unit is configured to supply power when the three electrical systems of the electric vehicle are in normal operation, the test power supply unit is configured to supply power when the low-voltage wiring harness 16 of the three electrical systems of the electric vehicle is tested, and the normal power supply unit and the test power supply unit are switched by a switch, where the normal power supply unit and the test power supply unit are both vehicle-mounted lead-acid batteries, and the vehicle-mounted lead-acid batteries output a power supply voltage of 12V.
In some embodiments of the present invention, the first detecting unit 14 may be disposed on the vehicle control unit 10, the second detecting unit 15 may be disposed on the battery management system 11 and the motor controller 12, and both the first detecting unit 14 and the second detecting unit 15 are single-chip microcomputers. The single chip microcomputer arranged on the vehicle control unit 10 may be used as a main single chip microcomputer (specifically, arranged on a circuit board of the vehicle control unit), the single chip microcomputers arranged on the battery management system 11 and the motor controller 12 may be used as sub-single chip microcomputers (specifically, arranged on circuit boards of the battery management system 11 and the motor controller 12), the sub-single chip microcomputers transmit the acquired electric signals of the low-voltage wire harness terminals to the main single chip microcomputer, and the main single chip microcomputer performs data analysis and diagnosis.
In some embodiments of the present invention, the first sensing unit 14 and the second sensing unit 15 communicate with each other via a CAN bus.
In some embodiments of the present invention, the first detection unit 14 and the second detection unit 15 communicate simultaneously over the high speed bus CanH and the low speed bus CanL. The high-speed bus CanH and the low-speed bus CanL are automobile network data transmission buses, the high-speed bus CanH and the low-speed bus CanL are usually twisted together to form a twisted pair so as to have better anti-interference capability, and the battery management system and the second detection unit 15 on the motor controller transmit data to the vehicle controller 10 through the high-speed bus CanH and the low-speed bus CanL. When the first detection unit 14 and the second detection unit 15 are both single-chip microcomputers, data communication is performed between the two single-chip microcomputers through the high-speed bus CanH and the low-speed bus CanL.
In some embodiments of the invention, the wire harness diagnostic system further comprises: the distribution circuit is arranged between the first end and the second end of the low-voltage wiring harness.
The controller is respectively connected with the power module 13 and the power distribution circuit, and is used for controlling the power distribution circuit to be connected with the normal power supply unit in the power module 13 and the three-electrical system of the electric automobile when the power module 13 supplies power normally, and controlling the power distribution circuit to be connected with the test power supply unit in the power module 13 and the three-electrical system of the electric automobile when the power module 13 performs test power supply.
In some embodiments of the invention, the power distribution circuit comprises MOS transistors. In the embodiment of the present invention, the MOS transistor is a metal-oxide-semiconductor (semiconductor) field effect transistor or a so-called metal-insulator-semiconductor (insulator) -semiconductor, and is used as a switching device for turning on and off a circuit.
In some embodiments of the present invention, the number of low voltage wiring harnesses 16 is determined based on the number of ports of the vehicle control unit, battery management system, and motor controller.
In some embodiments of the present invention, a description is given of a wire harness diagnosis system for a three-electrical system of an electric vehicle in the embodiments of the present invention, taking as an example that both the first detection unit 14 and the second detection unit 15 are single-chip microcomputers:
referring to fig. 2, fig. 2 is a schematic structural diagram of a wire harness diagnosis system in an application scenario disclosed in an embodiment of the present invention, in which a vehicle controller 10 has 8 test interfaces (corresponding to P0 to P7 of a master chip), a battery management system 11 has 4 test interfaces (corresponding to P0 to P3 of a slave chip), and a motor controller 12 has 4 test interfaces (corresponding to P4 to P7 of the slave chip), where P0 to P3 of the slave chip are connected to P0 to P3 of the master chip through low-voltage wire harnesses, P4 to P7 of the slave chip are connected to P4 to P7 of the master chip through low-voltage wire harnesses, the vehicle controller 10 and the motor controller 12 communicate with each other through a high-speed bus CanH and a low-speed bus CanL, and the battery management system 11 and the motor controller 12 also communicate with each other through the high-speed bus CanH and the low-speed bus CanL. It is understood that, corresponding to the number of the connection terminals of the low-voltage wire harness (corresponding to the number of the connection ports between the vehicle controller and the battery management system and the motor controller), the number of the test interfaces may also be expanded to be equal to the number of the connection terminals, so as to achieve the purpose of diagnosing each low-voltage wire harness.
The vehicle-mounted lead-acid battery is connected with a change-over switch, when the change-over switch is connected with a normal electricity 12V + and a normal electricity 12V-of the battery management system 11, the vehicle-mounted lead-acid battery is connected with a main loop system of the three-electricity system, the main loop system of the three-electricity system normally works, a test circuit system of the three-electricity system is in a non-working state, and the vehicle control unit 10, the battery management system 11 and the motor controller 12 are normally communicated through low-voltage wire harnesses; when the change-over switch is connected with a test 12V + and a test 12V-of the battery management system 11, the vehicle-mounted lead-acid battery is connected with a test circuit system of the three-electric system and is disconnected with the main loop system, the main loop system of the three-electric system stops working, and the influence of the main loop system on the test precision of the low-voltage wiring harness is avoided.
When the change-over switch is connected with a test 12V + and a test 12V-of the battery management system 11, the test circuit system is in a working state, sub-singlechips arranged on circuit boards of the battery management system 11 and the motor controller 12 collect electric signals (voltage signals or current signals) at a test port at one end of a low-voltage wire harness connected with the battery management system 11 and the motor controller 12, then the sub-singlechips transmit the collected electric signals to a main singlechip arranged on the whole vehicle controller 10, the main singlechip arranged on the whole vehicle controller 10 collects electric signals (voltage signals or current signals) at a test port at the other end of the low-voltage wire harness connected with the whole vehicle controller, the main singlechips compare the electric signals from the sub-singlechips with the electric signals collected by the main singlechips, and whether the low-voltage wire harness is connected in a wrong way or not is determined by the difference between the electric signals at the main singlechips and the electric signals at the sub-chips, And (3) diagnosing fractures and the like, and transmitting diagnosis results between upper computers through photoelectric converters (including Transmission (TX) and Reception (RX)).
Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a vehicle controller according to an embodiment of the present invention, wherein a power distribution circuit and a main single chip computer (as a wiring harness diagnosis circuit) are further disposed on a circuit board of the vehicle controller 10, and when a switch turns on a normal 12V + and a normal 12V-, a vehicle-mounted lead-acid battery turns on a main circuit system of a three-way system (i.e., P0 to P7 of the power distribution circuit are respectively turned on corresponding to a0 to a7 of the vehicle controller); when the test 12V + and the test 12V-of the battery management system 11 are switched on by the change-over switch, the vehicle-mounted lead-acid battery is switched on the test circuit system of the three-electric system (namely, P0 to P7 of the power distribution circuit are respectively connected with B0 to B7 of the vehicle controller) and is disconnected from the main circuit system, and the main circuit system of the three-electric system stops working.
Referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a power distribution circuit of a vehicle controller according to an embodiment of the present invention, where a vehicle-mounted lead-acid battery is used as a peripheral circuit to provide a 12V power supply voltage (a normal 12V and a test 12V), the power distribution circuit includes, but is not limited to, a control circuit (which may employ a controller, etc.) and a mos transistor for controlling the on/off of the circuit, when a switch switches on a normal 12V + and a normal 12V-of a battery management system 11, mos transistors between P0 to P7 and a0 to a7 of the vehicle controller are conducted, and P0 to P7 are respectively connected to a0 to a7 of the vehicle controller, so that a main loop system of a three-way system works normally; when the test 12V + and the test 12V-of the battery management system 11 are switched on by the change-over switch, mos tubes between the P0 to the P7 and B0 to B7 of the wire harness diagnosis circuit of the vehicle control unit are conducted, and the test circuit system of the three-electric system starts to work normally.
Referring to fig. 5, fig. 5 is a schematic circuit structure diagram of a wire harness diagnostic circuit disclosed in an embodiment of the present invention, where the wire harness diagnostic circuit may be composed of a main single chip, the main single chip correspondingly has 8 pins (B0 to B7) led out corresponding to the number of test interfaces of the vehicle controller 10, the main single chip detects electrical signals of the test ports of the vehicle controller 10 through the test pins B0 to B7, the main single chip uses a vehicle-mounted lead-acid battery as a peripheral circuit to provide a test supply voltage of 12V, the main single chip communicates with the sub single chip through a high-speed bus CanH and a low-speed bus CanL and diagnoses data transmitted by the sub single chip through the high-speed bus CanH and the low-speed bus CanL, and the main single chip transmits a diagnostic result to an upper computer through a photoelectric converter (including transmit, TX) and Receive (RX)).
Referring to fig. 6, fig. 6 is a schematic circuit structure diagram of a battery management system according to an embodiment of the present invention, wherein a power distribution circuit and a power supply circuit (which may be a single chip microcomputer (as a sub-single chip microcomputer)) of the battery management system are disposed on a circuit board of the battery management system 11, and when a switch turns on a normal power 12V + and a normal power 12V-of the battery management system 11, a vehicle-mounted lead-acid battery turns on a main circuit system of a three-power system (i.e., P0 to P3 of the power distribution circuit are respectively connected to C0 to C3 of the battery management system); when the test 12V + and the test 12V-of the battery management system 11 are switched on by the change-over switch, the vehicle-mounted lead-acid battery is switched on and disconnected from the main loop system by the test circuit system of the three-electrical-system (i.e. P0 to P3 of the power distribution circuit are respectively connected with D0 to D3 of the battery management system), and the main loop system of the three-electrical-system stops working. The sub-single chip computer communicates with the main single chip computer through a high-speed bus CanH and a low-speed bus CanL.
Referring to fig. 7, fig. 7 is a schematic circuit structure diagram of a power distribution circuit of a battery management system according to an embodiment of the present invention, wherein a vehicle-mounted lead-acid battery as a peripheral circuit can provide a supply voltage of 12V (a normal 12V and a test 12V), the power distribution circuit includes, but is not limited to, a control circuit (a controller or the like may be used) and a mos tube for controlling the on/off of the circuit, when a switch turns on a normal 12V + and a normal 12V-of the battery management system 11, mos tubes between P0 to P3 and C0 to C3 of the battery management system 11 are turned on, and P0 to P3 are respectively connected to C0 to C3 of the battery management system 11 so that a main loop system of a three-phase system normally operates; when the switch is switched on to test 12V + and test 12V-of the battery management system 11, mos transistors between P0 to P3 and D0 to D3 of the power supply circuit of the battery management system 11 are respectively conducted, and the test circuit system of the three-system starts to work normally.
Please refer to fig. 8, fig. 8 is a schematic circuit structure diagram of a power supply circuit of a battery management system according to an embodiment of the present invention, where the power supply circuit may be formed by a single chip microcomputer (serving as a sub-single chip microcomputer), the sub-single chip microcomputer correspondingly has 4 test pins (D0 to D3) led out corresponding to the number of test interfaces of the battery management system 11, the sub-single chip microcomputer detects electrical signals of a test port of the battery management system 11 through the test pins D0 to D3, the sub-single chip microcomputer uses a vehicle-mounted lead-acid battery as a peripheral circuit to provide a test supply voltage of 12V, and the sub-single chip microcomputer communicates with the main single chip microcomputer through a high-speed bus CanH and a low-speed bus CanL.
Referring to fig. 9, fig. 9 is a schematic circuit structure diagram of a motor controller according to an embodiment of the present invention, in which a power distribution circuit and a power supply circuit (which may be a single chip microcomputer (as a sub-single chip microcomputer)) of the motor controller 12 are disposed on a circuit board of the motor controller 12, and when a switch turns on a normal electric 12V + and a normal electric 12V —, a vehicle-mounted lead-acid battery turns on a main circuit system of a three-system (i.e., P4 to P7 of the power distribution circuit are respectively turned on corresponding to E0 to E3 of the motor controller); when the change-over switch is switched on for testing 12V + and 12V-, the vehicle-mounted lead-acid battery is switched on the testing circuit system of the three-electrical system (namely P4 to P7 of the power distribution circuit are respectively connected with F0 to F3 of the power supply circuit) and is disconnected from the main loop system, and the main loop system of the three-electrical system stops working. The sub-chip microcomputer provided on the motor controller 12 communicates with the main chip microcomputer through a high-speed bus CanH and a low-speed bus CanL.
Referring to fig. 10, fig. 10 is a schematic circuit structure diagram of a power distribution circuit of a motor controller according to an embodiment of the present invention, in which a vehicle-mounted lead-acid battery is used as a peripheral circuit to provide a supply voltage of 12V (a normal voltage of 12V and a test voltage of 12V), the power distribution circuit includes, but is not limited to, a control circuit (a controller or the like may be used) and a mos tube for controlling the on/off of the circuit, when a switch switches on the normal voltage of 12V + and the normal voltage of 12V —, the mos tubes between P4 to P7 and E0 to E3 of the motor controller 12 are turned on, and the P4 to P7 are turned on with E0 to E3 of the motor controller 12, so that a main loop system of a three-system normally operates; when the switch is switched on for the test 12V + and the test 12V-, mos tubes between the P4 to the P7 and F0 to F3 of the power supply circuit of the motor controller 12 are conducted, and the test circuit system of the three-electric system starts to work normally.
Referring to fig. 11, fig. 11 is a schematic circuit structure diagram of a power supply circuit of a motor controller according to an embodiment of the present invention, where the power supply circuit may be formed by a single chip microcomputer (serving as a sub-single chip microcomputer), the sub-single chip microcomputer correspondingly has 4 test pins (F0 to F3) led out corresponding to the number of test interfaces of the motor controller 12, the sub-single chip microcomputer detects electrical signals (which may be voltage signals) at a test port of the motor controller 12 through the test pins F0 to F3, the sub-single chip microcomputer uses a vehicle-mounted lead-acid battery as a peripheral circuit and can provide a test power supply voltage of 12V, and the sub-single chip microcomputer communicates with the main single chip microcomputer through a high-speed bus CanH and a low-speed bus CanL.
In some embodiments of the present invention, the results of the comparison of the voltages acquired by the master and slave singlechips include: firstly, the voltage values collected by the main single chip microcomputer and the sub single chip microcomputer are consistent (small errors are allowed, such as errors of 1% to 5%), and secondly, the voltage values collected by the main single chip microcomputer and the sub single chip microcomputer are inconsistent (errors are large, such as errors exceeding 10%).
When the voltage values acquired by the main singlechip and the sub singlechip are inconsistent, the terminal wiring sequence of the low-voltage wiring harness is judged to be disordered (wiring harness connection and return, wiring harness disconnection and the like), namely the low-voltage wiring harness is diagnosed in a mode that the voltage values acquired by the main singlechip and the sub singlechip are inconsistent.
To explain the diagnosis of the low voltage wire harness in detail, take the circuit at the sub-monolithic computer end in fig. 12 as an example, where the resistances between D0-D3 of the sub-monolithic computer are R01-1K Ω, R02-3K Ω, and R03-8K Ω, respectively, and D0-D3 of the sub-monolithic computer correspond to P0-P3 of the main monolithic computer, for example, the comparison between the detected voltages P0-P3 of the main monolithic computer and the detected voltages D0-D3 of the sub-monolithic computer and the corresponding diagnosis results are shown in table 1 below, where: the detection voltages of the main single chip microcomputer are U01, U02, U03, U12, U13 and U23. The detection voltages of the sub-chip microcomputer are u01, u02, u03, u12, u13 and u 23.
TABLE 1 diagnostic result table for master and slave singlechips
It should be noted that the diagnosis fault of the low-voltage wiring harness in the embodiment of the present invention may be of other types, and the embodiment of the present invention is not limited thereto.
Finally, the embodiment of the invention also discloses an electric automobile which comprises the wiring harness diagnosis system for the three-electric-system of the electric automobile.
According to the wiring harness diagnosis system for the three-electrical-system of the electric automobile, disclosed by the embodiment of the invention, the low-voltage wiring harness can be diagnosed by comparing the acquired data of the main single-chip microcomputer and the auxiliary single-chip microcomputer, the ports are not required to be sequentially measured by manually adopting a universal meter, the probability of missing detection or wrong detection is lower, a large amount of manpower and material resources are saved, the detection efficiency and the detection accuracy are higher, and the safety of the automobile is also improved. In addition, when the low-voltage wiring harness is detected, the low-voltage wiring harness is disconnected with a main loop system of the three-electrical-system and connected with a testing circuit system of the three-electrical-system, and the main loop system and the testing circuit system are not affected with each other, so that the testing circuit system can test the low-voltage wiring harness independently, the influence of the main loop system on the detection precision of the testing circuit system is avoided, and the detection precision is further improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A wiring harness diagnostic system for an electric vehicle three electrical system, the three electrical system comprising: vehicle control unit, battery management system and machine controller, vehicle control unit with battery management system with all connect through the low pressure pencil between the machine controller, its characterized in that, pencil diagnostic system includes:
the power supply module is respectively connected with the vehicle control unit, the battery management system and the motor controller and used for supplying power;
the power module includes: a normal power supply unit and a test power supply unit;
the normal power supply unit is used for supplying power for the three electric systems of the electric automobile when the three electric systems work normally;
the test power supply unit is used for supplying power for testing a low-voltage wiring harness of the three-electrical-system of the electric automobile;
the normal power supply unit and the test power supply unit are switched through a selector switch;
the detection device comprises a first detection unit and a second detection unit, wherein the first detection unit is connected with the second detection unit, the first detection unit is connected with a first end of the low-voltage wire harness, and the second detection unit is connected with a second end of the low-voltage wire harness;
when the power module is used for testing and supplying power, the first detection unit is used for detecting a first electric signal of the first end, the second detection unit is used for detecting a second electric signal of the second end, the second detection unit transmits the second electric signal to the first detection unit, the first detection unit is used for comparing the first electric signal with the second electric signal, and the low-voltage wiring harness is diagnosed through the difference of the first electric signal and the second electric signal.
2. The wire harness diagnostic system for an electric vehicle three-electrical system according to claim 1, wherein the normal power supply unit and the test power supply unit are both vehicle-mounted lead-acid batteries that output a supply voltage of 12V.
3. The wire harness diagnostic system for an electric vehicle three-electrical system according to claim 1 or 2, wherein the first detection unit and the second detection unit are each a single chip microcomputer.
4. The wire harness diagnostic system for an electric vehicle three-electrical system according to claim 3, wherein the first detection unit and the second detection unit communicate with each other through a CAN bus.
5. The wire harness diagnostic system for an electric vehicle three electric system according to claim 4, wherein the first detecting unit and the second detecting unit communicate simultaneously through a high speed bus and a low speed bus.
6. The wire harness diagnostic system for an electric vehicle three-electrical system according to claim 1 or 2, characterized by further comprising: a power distribution circuit and a controller, the power distribution circuit disposed between a first end and a second end of the low voltage wiring harness;
the controller respectively with power module with distribution circuit connects, is used for when power module normally supplies power, control distribution circuit switches on normal power supply unit in the power module with three electric systems of electric automobile when power module tests the power supply, control distribution circuit switches on test power supply unit in the power module with three electric systems of electric automobile.
7. The wire harness diagnostic system for an electric vehicle three-electrical system according to claim 6, wherein the power distribution circuit comprises MOS transistors.
8. The wire harness diagnosis system for an electric vehicle three-electrical system according to claim 1 or 2, wherein the number of the low-voltage wire harnesses is determined according to the port numbers of the vehicle control unit, the battery management system, and the motor controller.
9. An electric vehicle, comprising: the wire harness diagnosis system for an electric vehicle three-electrical system according to any one of claims 1 to 8.
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| JP7074726B2 (en) * | 2019-07-18 | 2022-05-24 | 矢崎総業株式会社 | Wire harness manufacturing system and wire harness manufacturing method |
| CN112327210A (en) * | 2020-11-06 | 2021-02-05 | 深圳英飞源技术有限公司 | Low-voltage wire harness fault detection circuit and method for energy storage battery system |
| CN113687183A (en) * | 2021-08-20 | 2021-11-23 | 中车唐山机车车辆有限公司 | Control circuit detection device and control circuit detection method |
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