CN103612567B - A kind of High-voltage safety protection system of electromobile and method thereof - Google Patents

A kind of High-voltage safety protection system of electromobile and method thereof Download PDF

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Publication number
CN103612567B
CN103612567B CN201310592395.4A CN201310592395A CN103612567B CN 103612567 B CN103612567 B CN 103612567B CN 201310592395 A CN201310592395 A CN 201310592395A CN 103612567 B CN103612567 B CN 103612567B
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voltage
fault
connector
module
processing module
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CN103612567A (en
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袁永军
王珂
刘天翼
王志强
袁兼宗
李雨恒
王清
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Shanghai Yirui Automobile Science & Technology Co Ltd
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Shanghai Yirui Automobile Science & Technology Co Ltd
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Abstract

The present invention is directed to electronlmobil mesohigh connector surprisingly to loosen or open failure, disclose a kind of more rationally, the High-voltage safety protection system of electromobile of safety and reliability and guard method.Mainly comprise low voltage monitoring circuit, voltage sample module, Diagnostic Strategy module and fault processing module; Described low voltage monitoring circuit is provided with three voltage acquisition points A, B, C, and draws voltage sample line branch a, b, a c; Described sample line branch a, b, c are electrically connected with voltage sample module respectively; Described voltage sample module is electrically connected with Diagnostic Strategy module; Described Diagnostic Strategy module is electrically connected with fault processing module.The present invention adopts and carries out packet segmentation setting to low voltage monitoring circuit, judges hazard level, and make early warning signal in time according to the high-voltage connector disconnection in driving conditions; Mainly according to diagnosing the fault level obtained, choosing rational fault handling measure in conjunction with Current vehicle operating mode, improving the safety of battery-driven car.

Description

A kind of High-voltage safety protection system of electromobile and method thereof
Technical field:
The present invention relates to electronlmobil application to receive, particularly electric automobile high-voltage safety guard-safeguard and control field.
Background technology
At present, most pure electric automobile or hybrid vehicle all adopt high-tension battery to improve the efficiency of car load, therefore the safety protection problem that there is high-tension current all more or less, such as with the connector of each controller of high-tension line or the connector of High-Voltage Electrical Appliances circuit, occur to loosen or fracture, high-tension line may be caused to expose, and increase personnel get an electric shock risk; Or cause the normal operating interruptions of high tension apparatus, cause operating vehicle to break down or accident, there is potential safety hazard significantly;
In the prior art, in order to prevent above-mentioned potential safety hazard, common way is the parallel monitoring circuit arranging high-voltage safety in the high tension loop of electric car automobile; Namely in high tension loop, increase the light current circuit of 12V or 5V, after being cascaded by all connectors relevant with high tension loop, access high-pressure security protection system; If any one connector in light current circuit does not normally combine or disconnects, then whole light current circuit also disconnects, and light current voltage of system when returning just becomes 0V; Now just can diagnose out the open fault that there occurs certain high-voltage connector;
This structure to be connected the hardware configuration of all connectors owing to have employed light current circuit, although implement fairly simple, but, but there is the defect that accurately cannot judge which connector et out of order in it, because any one connector disconnects, high-pressure security protection systems axiol-ogy all can be made to be 0V to light current voltage of system; Simultaneously due to can not clear failure source, make the processing method for fault also more single, the High voltage output of bag of namely all cutting off the electricity supply under any situation, so just the possibility of other danger be brought out in existence; Such as when high vehicle speeds, high-pressure air conditioner compressor connector occurs to loosen or disconnect, and the strategy only adopting cut off high to export is on the contrary to cause vehicle et out of order, and this is very unfavorable to vehicle safe driving.
Summary of the invention
The object of the invention is for overcoming in prior art, high voltage circuit protection system accurately cannot judge that the defect of which connector et out of order provides a kind of new High-voltage safety protection system of electromobile, carries out grouping monitoring to high-voltage connector; And surprisingly loosen or open failure for electronlmobil mesohigh connector, carry out appropriate design, provide one more rationally, more failure-free method for security protection.
The present invention includes low voltage monitoring circuit, voltage sample module, Diagnostic Strategy module and fault processing module; Described low voltage monitoring circuit is provided with three voltage acquisition points, i.e. voltage acquisition point A, voltage acquisition point B, voltage acquisition point C; Described voltage acquisition point A, voltage acquisition point B, voltage acquisition point C respectively draw voltage sample line branch a, b, a c; Described voltage sample line branch a, b, c are electrically connected with voltage sample module respectively; Described voltage sample module is electrically connected with Diagnostic Strategy module; Described Diagnostic Strategy module is electrically connected with fault processing module;
Described Diagnostic Strategy module comprises master controller, and described master controller is provided with interface, comprises input/output interface (I/O interface), CAN interface, spi bus interface, for being connected with external module; Described master controller is connected with voltage acquisition module by I/O interface, the voltage signal of real-time reception voltage acquisition module; Described master controller adopts real-time embedded operation control system;
Described voltage acquisition module comprises multi-path signal modulate circuit, for the voltage signal collected is converted to the discernible signal of master controller, then by electrical connection, signal is sent into the I/O interface of Diagnostic Strategy module, and gathers signal and analyze;
Described fault processing module (2) comprises CAN transceiver and high-voltage relay driving circuit, described CAN transceiver is connected with CAN Interface Electrical, and described high-voltage relay driving circuit is connected with the input/output interface (I/O) of Diagnostic Strategy module.
Described voltage sample module is connected with voltage sample line branch a, b, c respectively, is mainly used in the real-time voltage value gathering voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3; Voltage acquisition point A, voltage acquisition point B that described Diagnostic Strategy module is used for gathering according to voltage sample module, the magnitude of voltage of voltage acquisition point C judge whether each high-voltage connector occurs to disconnect or looseness fault; The diagnostic result that described fault processing module sends for receiving Diagnostic Strategy module, and entire car controller is given the alarm signal.
Described low voltage monitoring circuit adopts specific wire harness placement policies, and described specific wire harness placement policies comprises three hazard level connector groups, i.e. high-risk grade connector group, general hazard level connector group, low hazard level connector group; Described high-risk grade connector group, general hazard level connector group, low hazard level connector group are sequentially connected in series together; Described high-risk grade connector group comprises main high voltage connector, the main high voltage parts that described main high voltage connector normally works for connecting power system, and on last connector of main high voltage connector setting voltage collection point A, and extraction voltage sample line branch a; Described general hazard level connector group comprises secondary high-voltage connector, the secondary high voltage component that described secondary high-voltage connector normally works for connecting power system, and on last connector of secondary high-voltage connector setting voltage collection point B, and extraction voltage sample line branch b; Described low hazard level connector group comprises other high-voltage connectors; Other high-voltage connectors described for connect that power system normally works irrelevant or the high voltage component without obvious relation, and on last connector of other high-voltage connectors setting voltage collection point C, and extraction voltage sample line branch c.
The level value of described low voltage monitoring circuit is provided by high-pressure security protection system; Described level value is exported by high-pressure security protection system; the low tension level values of the setting of described low voltage monitoring circuit is 12V; according to hazard level order from high to low successively through high-risk grade connector group, general hazard level connector group, low hazard level connector group, and accessed the voltage sample module of high-pressure security protection system by voltage sample line branch a, b, c.
Described fault processing module, except with except Diagnostic Strategy model calling, is also connected with entire car controller, power brick Power output Control end; Described fault processing module together with Diagnostic Strategy model calling, for accept Diagnostic Strategy module send breakdown judge result; Described fault processing module is mainly linked together by CAN and entire car controller, for receiving vehicle speed signal that entire car controller sends or sending alerting signal by CAN to entire car controller; Described fault processing module and power brick Power output Control end, for controlling the break-make of power brick Power output relay; Described fault processing module selects rational Security Techniques by the breakdown judge result received in conjunction with the informix judgement of current vehicle speed.
The present invention also comprises a kind of electric automobile high-voltage method for security protection, said method comprising the steps of:
Step one, voltage acquisition: by voltage sample module, gather three branch sample line a, the upper information of voltage of b, c in described low voltage monitoring circuit, determine the magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3;
Step 2, trouble diagnosing: described Diagnostic Strategy module according to the voltage value fault logic list of gathered voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3, and carries out comparing; Judge whether high-voltage connector occurs to loosen or open failure according to comparing result; If comparison result occurs meeting item in fault logic list, then current high-voltage connector occurs to loosen or open failure, and by the fault processing module of information transmission; If comparison result does not occur meeting item in fault logic list, then diagnosis is passed through;
Preferably, described fault logic list row have been passed the imperial examinations at the provincial level the magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C, and set different combinations of voltages and reflect different fault causes;
Preferably, a fault cause only corresponding resultant fault grade in described fault logic list; Generally, when the fault of the corresponding different brackets of different reason, get the highest fault level as resultant fault grade;
Preferably, described resultant fault level setting is three grades, i.e. three grades of faults, secondary failure and level faults; Described three grades of faults occur loosening for the one or more connectors in described high-risk grade connector group or disconnect the fault caused; Described secondary failure is when there is not three grades of faults, and in described general hazard level connector group, one or more connector occurs to loosen or disconnect the fault caused; Described level fault be when do not occur three grades, secondary failure, in described low hazard level connector group, one or more connector occurs to loosen or disconnect the fault caused;
Step 3, fault handling: the fault diagnosis result that described fault processing module draws according to described Diagnostic Strategy module, in conjunction with the driving conditions of Current vehicle, chooses rational Security Techniques;
Preferably, choosing of described Security Techniques comprises the following steps:
A, described fault processing module obtain current vehicle speed value V by CAN from entire car controller;
The low velocity threshold of b, the setting speed of a motor vehicle is V1, if current vehicle speed value V is less than low velocity threshold V1, no matter which kind of failure diagnosis information is described Diagnostic Strategy module send to fault processing module, fault processing module is all by direct cut off high relay, disconnect High voltage output, and send alarm message by CAN to entire car controller, warning light in instrument is lighted;
The High Speed Threshold of c, the setting speed of a motor vehicle is V2, and V2>V1; If current vehicle speed value V is greater than or equal to High Speed Threshold V2, and resultant fault grade is three grades, then the direct cut off high relay of fault processing module disconnects High voltage output, and sends a warning to entire car controller, and the indicator lamp of instrument carrier panel is lighted;
If value V is greater than or equal to V2 for d current vehicle speed, and resultant fault grade is secondary, then fault processing module still keeps high-voltage relay to be in closed state, but the possible also reminding user that certain safety measure need be taked to reduce to cause danger further keep in repair vehicle in time; As reduced high-tension battery input-output power limit value etc., and send a warning to entire car controller, warning light on instrument carrier panel is lighted;
If value V is greater than or equal to V2 for e current vehicle speed, and resultant fault grade is one-level, then fault processing module still keeps original high-voltage relay to be in closed state, only sends a warning to entire car controller, warning light on instrument carrier panel is lighted;
If f current vehicle speed value V is but V2 lower than High Speed Threshold higher than low velocity threshold V1, and resultant fault grade is three grades, then the direct cut off high relay of fault processing module disconnects High voltage output, and sends a warning to entire car controller, and the indicator lamp of instrument carrier panel is lighted;
If g current vehicle speed value V is but V2 lower than High Speed Threshold higher than low velocity threshold V1, and resultant fault grade is not three grades, then fault processing module first judge current vehicle speed V enter V1 and V2 interval before the velocity amplitude V ' at place, if vehicle velocity V ' is before in be more than or equal to V2 interval, when then there is firsts and seconds fault, processing mode continuity steps d, e; If vehicle velocity V ' is before in be less than or equal to V1 interval, then when there is firsts and seconds fault, processing mode continuity step b, can reduce the sudden change of speed of a motor vehicle fault handling pattern when V1 threshold value or V2 Near Threshold bob like this.
The battery-driven car high-pressure security protection system that the present invention sets up, adopts and carries out packet segmentation setting to low voltage monitoring circuit, judges hazard level simultaneously, and make early warning signal in time according to the high-voltage connector disconnection in driving conditions; The high-pressure security protection method that native system is set up mainly for the fault surprisingly loosening for high voltage connector of electric automobile or disconnect; according to diagnosing the fault level obtained; choose rational fault handling measure in conjunction with Current vehicle operating mode, improve the safety of battery-driven car.
Accompanying drawing explanation
Fig. 1 is structural schematic block diagram of the present invention;
Fig. 2 is the guard method diagram of circuit of a kind of specific embodiment of the present invention;
Fig. 3 is fault handling strategic process figure of the present invention
Fig. 4 is the high-pressure system fault logic list of embodiments of the invention setting
Detailed description of the invention
The invention will be further described for the embodiment provided below in conjunction with accompanying drawing:
As shown in Figure 1, the present invention includes low voltage monitoring circuit 5, voltage sample module 4, Diagnostic Strategy module 3 and fault processing module 2; Described low voltage monitoring circuit 5 is provided with three voltage acquisition points, i.e. voltage acquisition point A, voltage acquisition point B, voltage acquisition point C; Described voltage acquisition point A, voltage acquisition point B, voltage acquisition point C respectively draw voltage sample line branch a, b, a c; Described voltage sample line branch a, b, c are electrically connected with voltage sample module respectively, are mainly used in the real-time voltage value gathering voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3; Described voltage sample module 4 is electrically connected with Diagnostic Strategy module 3, described Diagnostic Strategy module 3 for gather according to voltage sample module 4 voltage acquisition point A, voltage acquisition point B, voltage acquisition point C magnitude of voltage judge each high-voltage connector whether occur disconnect or looseness fault; Described Diagnostic Strategy module 3 is electrically connected with fault processing module 2, the diagnostic result that described fault processing module 2 sends for receiving Diagnostic Strategy module 3, and to give the alarm signal to entire car controller;
Described Diagnostic Strategy module 3 comprises master controller, and described master controller is provided with interface, comprises input/output interface (I/O interface), CAN interface, spi bus interface, for being connected with external module; Described master controller is connected with voltage acquisition module by I/O interface, the voltage signal of real-time reception voltage acquisition module; Described master controller adopts real-time embedded operation control system;
Described voltage acquisition module 4 comprises multi-path signal modulate circuit, for the voltage signal collected is converted to the discernible signal of master controller, then by electrical connection, signal is sent into the I/O interface of Diagnostic Strategy module, and signal is gathered and analyzes;
Described fault processing module (2) comprises CAN transceiver and high-voltage relay driving circuit, described CAN transceiver is connected with CAN Interface Electrical, and described high-voltage relay driving circuit is connected with the input/output interface (I/O) of Diagnostic Strategy module.
As shown in Figure 1, described low voltage monitoring circuit 5 adopts specific wire harness placement policies, described specific wire harness placement policies comprises three hazard level connector groups, i.e. high-risk grade connector group 8, general hazard level connector group 12, low hazard level connector group 15; Described high-risk grade connector group 8, general hazard level connector group 12, low hazard level connector group 15 are sequentially connected in series together; Described high-risk grade connector group 8 comprises main high voltage connector, the main high voltage parts that described main high voltage connector normally works for connecting power system, specifically comprise high-tension battery bag connector 6, high pressure distribution box without protectors connector 7, connector for motor controller 9 and drive motor connector 10; Described high-tension battery bag connector 6 links together with high pressure distribution box without protectors connector 7; Described high pressure distribution box without protectors connector 7 links together with connector for motor controller 9; Described connector for motor controller 9 links together with drive motor connector 10; Described drive motor connector 10 be provided with voltage monitoring point A, and from this voltage detecting point A extraction voltage sample line branch a; Described general hazard level connector group 12 comprises secondary high-voltage connector, the secondary high voltage component that described secondary high-voltage connector normally works for connecting power system, specifically comprises air-conditioning compressor connector 11 and electric heater socket connector 13; Described air-conditioning compressor connector 11 links together with electric heater socket connector 13; Described electric heater socket connector 13 is provided with voltage detecting point B, and from this voltage detecting point B extraction voltage sample line branch b; Described low hazard level connector group 15 comprises other high-voltage connectors, is mainly used in connecting that power system normally works is irrelevant or without the high voltage component of obvious relation, specifically comprises vehicle-mounted charge motor connector 14 and DC/DC connector 16; Described vehicle-mounted charge motor connector 14 connects 16 with DC/DC connector and is connected together; Described DC/DC connector 16 is provided with voltage detecting point C, and from this voltage detecting point C extraction voltage sample line branch c;
The level value of described low voltage monitoring circuit 5 is provided by high-pressure security protection system; Described level value is exported by high-pressure security protection system, the low tension level values of setting is 12V, according to hazard level order from high to low successively through high-risk grade connector group 8, general hazard level connector group 12, low hazard level connector group 15, and accessed the voltage sample module 4 of high-pressure security protection system by voltage sample line branch a, b, c;
The wire harness placement policies that described low voltage monitoring circuit 5 adopts, can identify that major failure is originated effectively; As shown in Figure 1, the low tension level values of setting is 12V, and under normal circumstances, the voltage of voltage sample point A, B, C 3 is 12V; When in high-risk grade connector group 8 add plug-in unit produce loosen or open failure time, namely the voltage of voltage sample point A become 0V, and the voltage of voltage sample point B, C remains unchanged, and is still 12V; When connector in general hazard level connector group 12 produces loosening or open failure, now the voltage of voltage sample point B becomes OV, and the voltage of voltage sample point A, C then remains unchanged, and is still 12V; When connector in low hazard level connector group 15 produces loosening or open failure, now the voltage of voltage sample point C becomes 0V, and the voltage of voltage sample point A, B remains unchanged, and is still 12V;
As shown in Figure 1, described fault processing module 2, except being connected with Diagnostic Strategy module 3, is also connected with entire car controller 1, power brick Power output Control end; Described fault processing module 2 links together with Diagnostic Strategy module 3, for accepting the breakdown judge result that Diagnostic Strategy module sends; Described fault processing module 2 is mainly linked together by CAN and entire car controller 1, for receiving vehicle speed signal that entire car controller 1 sends or sending alerting signal by CAN to entire car controller 1; Described fault processing module 2 and power brick Power output Control end, for controlling the break-make of power brick Power output relay; Described fault processing module 2 selects rational Security Techniques by the breakdown judge result received in conjunction with the informix judgement of current vehicle speed.
As shown in Figure 2, the present invention also comprises a kind of electric automobile high-voltage method for security protection, said method comprising the steps of:
S1, voltage acquisition: by voltage sample module 4, gather three branch sample line a, the upper information of voltage of b, c in described low voltage monitoring circuit 5, determine the magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3;
S2, trouble diagnosing: described Diagnostic Strategy module 3 according to the voltage value fault logic list of gathered voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3, and carries out comparing; Judge whether high-voltage connector occurs to loosen or open failure according to comparing result; If comparison result occurs meeting item in fault logic list, then current high-voltage connector occurs to loosen or open failure, and by the fault processing module of information transmission; If comparison result does not occur meeting item in fault logic list, then diagnosis is passed through;
Preferably, as shown in table 1, described fault logic list row have been passed the imperial examinations at the provincial level the magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C, and set different combinations of voltages and reflect different fault causes;
Preferably, as shown in table 1, a fault cause only corresponding resultant fault grade in described fault logic list; Generally, when the fault of the corresponding different brackets of different reason, get the highest fault level as resultant fault grade;
Preferably, described resultant fault level setting is three grades, i.e. three grades of faults, secondary failure and level faults; Described three grades of faults occur loosening for the one or more connectors in described high-risk grade connector group 8 or disconnect the fault caused; Described secondary failure is when there is not three grades of faults, and in described general hazard level connector group 12, one or more connector occurs to loosen or disconnect the fault caused; Described level fault be when do not occur three grades, secondary failure, in described low hazard level connector group 15, one or more connector occurs to loosen or disconnect the fault caused;
S3, fault handling: the fault diagnosis result that described fault processing module 2 draws according to described Diagnostic Strategy module 3, in conjunction with the driving conditions of Current vehicle, chooses rational Security Techniques;
Preferably, as shown in Figure 3, choosing of described Security Techniques comprises the following steps:
S31, described fault processing module 2 obtain current vehicle speed value V by CAN from entire car controller 1;
The low velocity threshold of S32, the setting speed of a motor vehicle is V1=8km/h, if current vehicle speed value V is less than low velocity threshold 8km/h, no matter which kind of failure diagnosis information is described Diagnostic Strategy module 3 send to fault processing module 2, fault processing module 2 is all by direct cut off high relay, disconnect High voltage output, and send alarm message by CAN to entire car controller 1, warning light in instrument is lighted;
The High Speed Threshold of S33, the setting speed of a motor vehicle is V2=15km/h; If current vehicle speed value V is greater than or equal to High Speed Threshold 15km/h, and resultant fault grade is three grades, then fault processing module straight 2 connects cut off high relay disconnection High voltage output, and sends a warning to entire car controller 1, and the indicator lamp of instrument carrier panel is lighted;
If value V is greater than or equal to 15km/h for S34 current vehicle speed, and resultant fault grade is secondary, then fault processing module 2 still keeps high-voltage relay to be in closed state, but the possible also reminding user that certain safety measure need be taked to reduce to cause danger further keep in repair vehicle in time; As reduced high-tension battery input-output power limit value etc., and send a warning to entire car controller 1, warning light on instrument carrier panel is lighted;
If value V is greater than or equal to 15km/h for S35 current vehicle speed, and resultant fault grade is one-level, then fault processing module 2 still keeps original high-voltage relay to be in closed state, only sends a warning to entire car controller 1, warning light on instrument carrier panel is lighted;
If S36 current vehicle speed value V is but 15km/h lower than High Speed Threshold higher than low velocity threshold 8km/h, and resultant fault grade is three grades, then fault processing module 2 directly cut off high relay disconnection High voltage output, and send a warning to entire car controller 1, the indicator lamp of instrument carrier panel is lighted;
If S37 current vehicle speed value V is but 15km/h lower than High Speed Threshold higher than low velocity threshold 8km/h, and resultant fault grade is not three grades, then fault processing module 2 first judge current vehicle speed V enter 8km/h and 15km/h interval before the velocity amplitude V ' at place, if vehicle speed value V ' is before in be more than or equal to 15km/h interval, when then there is firsts and seconds fault, processing mode continuity step S34, S35; If vehicle velocity V ' is before in be less than or equal to 8km/h interval, then when there is firsts and seconds fault, processing mode continuity step S32, can reduce speed of a motor vehicle sudden change of fault handling pattern during bob near 8km/h or 15km/h like this.

Claims (6)

1. a High-voltage safety protection system of electromobile, comprises low voltage monitoring circuit (5), voltage sample module (4), Diagnostic Strategy module (3) and fault processing module (2); It is characterized in that: described low voltage monitoring circuit (5) is provided with three voltage acquisition points, i.e. voltage acquisition point A, voltage acquisition point B, voltage acquisition point C; Described voltage acquisition point A, voltage acquisition point B, voltage acquisition point C respectively draw voltage sample line branch a, b, a c; Described voltage sample line branch a, b, c are electrically connected with voltage sample module (4) respectively; Described voltage sample module (4) is electrically connected with Diagnostic Strategy module (3); Described Diagnostic Strategy module (3) is electrically connected with fault processing module (2);
Described Diagnostic Strategy module (3) comprises master controller, and described master controller is provided with interface, comprises input/output interface (I/O interface), CAN interface, spi bus interface, for being connected with external module; Described master controller is connected with voltage acquisition module by I/O interface, the voltage signal of real-time reception voltage acquisition module; Described master controller adopts real-time embedded operation control system;
Described voltage acquisition module (4) comprises multi-path signal modulate circuit, for the voltage signal collected is converted to the discernible signal of master controller, then by electrical connection, signal is sent into the I/O interface of Diagnostic Strategy module, and signal is gathered and analyzes;
Described fault processing module (2) comprises CAN transceiver and high-voltage relay driving circuit, described CAN transceiver is connected with CAN Interface Electrical, and described high-voltage relay driving circuit is connected with the input/output interface (I/O interface) of Diagnostic Strategy module.
2. a kind of High-voltage safety protection system of electromobile according to claim 1, it is characterized in that: described voltage sample module (4) is connected with voltage sample line branch a, b, c respectively, be mainly used in the real-time voltage value gathering voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3; Described Diagnostic Strategy module (3) for gather according to voltage sample module voltage acquisition point A, voltage acquisition point B, voltage acquisition point C magnitude of voltage judge each high-voltage connector whether occur disconnect or looseness fault; The diagnostic result that described fault processing module (2) sends for receiving Diagnostic Strategy module, and entire car controller is given the alarm signal.
3. a kind of High-voltage safety protection system of electromobile according to claim 1, it is characterized in that: described low voltage monitoring circuit (5) adopts specific wire harness placement policies, described specific wire harness placement policies comprises three hazard level connector groups, i.e. high-risk grade connector group (8), general hazard level connector group (12), low hazard level connector group (15); Described high-risk grade connector group (8), general hazard level connector group (12), low hazard level connector group (15) are sequentially connected in series together; Described high-risk grade connector group (8) comprises main high voltage connector, the main high voltage parts that described main high voltage connector normally works for connecting power system, and on last connector of main high voltage connector setting voltage collection point A, and extraction voltage sample line branch a; Described general hazard level connector group (12) comprises secondary high-voltage connector, the secondary high voltage component that described secondary high-voltage connector normally works for connecting power system, and on last connector of secondary high-voltage connector setting voltage collection point B, and extraction voltage sample line branch b; Described low hazard level connector group (15) comprises other high-voltage connectors; Other high-voltage connectors described for connect that power system normally works irrelevant or the high voltage component without obvious relation, and on last connector of other high-voltage connectors setting voltage collection point C, and extraction voltage sample line branch c.
4. a kind of High-voltage safety protection system of electromobile according to claim 1, is characterized in that: the level value of described low voltage monitoring circuit (5) is provided by high-pressure security protection system; Described level value is exported by high-pressure security protection system; the low tension level values of the setting of described low voltage monitoring circuit (5) is 12V; according to hazard level order from high to low successively through high-risk grade connector group (8), general hazard level connector group (12), low hazard level connector group (15), and accessed the voltage sample module (4) of high-pressure security protection system by voltage sample line branch a, b, c.
5. a kind of High-voltage safety protection system of electromobile according to claim 1, it is characterized in that: described fault processing module (2), except being connected with Diagnostic Strategy module (3), is also connected with entire car controller (1), power brick Power output Control end; Described fault processing module (2) and Diagnostic Strategy module (3) link together, for accepting the breakdown judge result that Diagnostic Strategy module (3) sends; Described fault processing module (2) is mainly linked together by CAN and entire car controller, for receiving vehicle speed signal that entire car controller (1) sends or sending alerting signal by CAN to entire car controller (1); Described fault processing module (2) and power brick Power output Control end, for controlling the break-make of power brick Power output relay; Described fault processing module (2) selects rational Security Techniques by the breakdown judge result received in conjunction with the informix judgement of current vehicle speed.
6. an electric automobile high-voltage method for security protection, is characterized in that: said method comprising the steps of:
Step one, voltage acquisition: by voltage sample module (4), gather three branch sample line a, the upper information of voltage of b, c in low voltage monitoring circuit (5), determine the magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3;
Step 2, trouble diagnosing: Diagnostic Strategy module (3) according to the voltage value fault logic list of gathered voltage acquisition point A, voltage acquisition point B, voltage acquisition point C 3, and carries out comparing; Judge whether high-voltage connector occurs to loosen or open failure according to comparing result; If comparison result occurs meeting item in fault logic list, then current high-voltage connector occurs to loosen or open failure, and information is sent to fault processing module; If comparison result does not occur meeting item in fault logic list, then diagnosis is passed through;
List the magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C in described fault logic list, and set different combinations of voltages and reflect different fault causes;
A fault cause only corresponding resultant fault grade in described fault logic list; Generally, when the fault of the corresponding different brackets of different reason, get the highest fault level as resultant fault grade;
Described resultant fault level setting is three grades, i.e. three grades of faults, secondary failure and level faults; Described three grades of faults occur loosening for the one or more connectors in high-risk grade connector group or disconnect the fault caused; Described secondary failure is when there is not three grades of faults, and in general hazard level connector group, one or more connector occurs to loosen or disconnect the fault caused; Described level fault be when do not occur three grades, secondary failure, in low hazard level connector group, one or more connector occurs to loosen or disconnect the fault caused;
Step 3, fault handling: the fault diagnosis result that described fault processing module (2) draws according to described Diagnostic Strategy module (3), in conjunction with the driving conditions of Current vehicle, chooses rational Security Techniques;
Choosing of described Security Techniques comprises the following steps:
A, described fault processing module (2) obtain current vehicle speed value V by CAN from entire car controller (1);
The low velocity threshold of b, the setting speed of a motor vehicle is V1, if current vehicle speed value V is less than low velocity threshold V1, no matter which kind of failure diagnosis information is described Diagnostic Strategy module send to fault processing module (2), fault processing module (2) is all by direct cut off high relay, disconnect High voltage output, and send alarm message by CAN to entire car controller (1), warning light in instrument is lighted;
The High Speed Threshold of c, the setting speed of a motor vehicle is V2, and V2>V1; If current vehicle speed value V is greater than or equal to High Speed Threshold V2, and resultant fault grade is three grades, then fault processing module (2) directly cut off high relay disconnection High voltage output, and send a warning to entire car controller (1), the indicator lamp of instrument carrier panel is lighted;
If value V is greater than or equal to V2 for d current vehicle speed, and resultant fault grade is secondary, then fault processing module (2) still keeps high-voltage relay to be in closed state, but the possible also reminding user that certain safety measure need be taked to reduce to cause danger further keep in repair vehicle in time; Reduce high-tension battery input-output power limit value, and send a warning to entire car controller (1), warning light on instrument carrier panel is lighted;
If value V is greater than or equal to V2 for e current vehicle speed, and resultant fault grade is one-level, then fault processing module (2) still keeps original high-voltage relay to be in closed state, only sends a warning to entire car controller (1), warning light on instrument carrier panel is lighted;
If f current vehicle speed value V is but V2 lower than High Speed Threshold higher than low velocity threshold V1, and resultant fault grade is three grades, then fault processing module (2) directly cut off high relay disconnection High voltage output, and send a warning to entire car controller (1), the indicator lamp of instrument carrier panel is lighted;
If g current vehicle speed value V is but V2 lower than High Speed Threshold higher than low velocity threshold V1, and resultant fault grade is not three grades, then fault processing module (2) first judge current vehicle speed V enter V1 and V2 interval before the velocity amplitude V ' at place, if vehicle velocity V ' is before in be more than or equal to V2 interval, when then there is firsts and seconds fault, processing mode continuity steps d, e; If vehicle velocity V ' is before in be less than or equal to V1 interval, then when there is firsts and seconds fault, processing mode continuity step b, can reduce the sudden change of speed of a motor vehicle fault handling pattern when V1 threshold value or V2 Near Threshold bob like this.
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