CN103612567A - Electric vehicle high voltage safety protecting system and method - Google Patents
Electric vehicle high voltage safety protecting system and method Download PDFInfo
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- CN103612567A CN103612567A CN201310592395.4A CN201310592395A CN103612567A CN 103612567 A CN103612567 A CN 103612567A CN 201310592395 A CN201310592395 A CN 201310592395A CN 103612567 A CN103612567 A CN 103612567A
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Abstract
The invention aims at the high voltage connector accidental loosening and breakage faults and discloses a reasonable, safe and reliable Electric vehicle high voltage safety protecting system and method. The system mainly comprises a low voltage monitoring line, a voltage sampling module, a diagnosing strategy module and a fault processing module. Three voltage collecting points A, B and C are disposed on the low voltage monitoring line and guide out three voltage sampling branches a, b and c. The voltage sampling branches a, b and c are respectively electrically connected with the voltage sampling module. The voltage sampling module is electrically connected with the diagnosing strategy module. The diagnosing strategy module is electrically connected with the fault processing module. The low voltage monitoring line is set in a fragmentation manner, danger levels are judged according to breakage conditions of high voltage connectors during travelling, pre-warning signals are given timely, reasonable fault processing measures are taken according to the fault levels obtained by diagnosing and the current vehicle work conditions, and safety of electric vehicles is increased.
Description
Technical field
The present invention relates to electronlmobil application and 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 safety guard-safeguard problem that has high-tension current more or less all, for example, with the connector of each controller or the connector of High-Voltage Electrical Appliances circuit of high-tension line, there is loosening or fracture, may cause high-tension line to expose, the increase personnel risk of getting an electric shock; Or cause the normal operation of high tension apparatus to be interrupted, cause operating vehicle to break down or accident, have potential safety hazard significantly;
In the prior art, in order to prevent above-mentioned potential safety hazard, common way is the parallel monitoring circuit that high-voltage safety is set in the high tension loop of electric car automobile; In high tension loop, increase the light current circuit of a 12V or 5V, after all connectors relevant with high tension loop are cascaded, access high-pressure security protection system; If the normal combination of any one connector in light current circuit or disconnection, whole light current circuit also disconnects, and the light current voltage of system while returning just becomes 0V; Now just can diagnose out the open fault that certain high-voltage connector has occurred;
This structure is owing to having adopted the connect hardware configuration of all connectors of light current circuit, although implement fairly simple, but, but there is the defect that cannot accurately judge which connector et out of order in it, because any one connector disconnects, all can make high-pressure security protection system light current voltage of system be detected is 0V; Simultaneously due to can not clear failure source, make for the processing method of fault also more single, the High voltage output of the bag of all cutting off the electricity supply under any situation, the possibility that so just other danger are brought out in existence; Such as when the high vehicle speeds, high-pressure air conditioner compressor connector occurs loosening or disconnects, and only adopts the strategy of cut off high output 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 cannot accurately judge that the defect of which connector et out of order provides a kind of new electric automobile high-voltage safety system, and high-voltage connector is divided into groups to monitor; And for the unexpected loosening or open failure of electronlmobil mesohigh connector, carry out appropriate design, provide a kind of more rationally, failure-free method for security protection more.
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 a voltage sample line a of branch, b, c; The described voltage sample line a of branch, b, c are electrically connected to voltage sample module respectively; Described voltage sample module is electrically connected to Diagnostic Strategy module; Described Diagnostic Strategy module is electrically connected to 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 bus interface, spi bus interface, for being connected with external module; Described master controller is connected with voltage acquisition module by I/O interface, in real time the voltage signal of receiver 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 collecting being converted to the discernible signal of master controller, then, by electrical connection, signal being sent into the I/O interface of Diagnostic Strategy module, and signal is gathered and analyzed;
Described fault processing module comprises CAN bus transceiver and high-voltage relay driving circuit, is electrically connected respectively with input/output interface (I/O), the CAN bus interface of Diagnostic Strategy module.
Described voltage sample module is connected with the voltage sample line a of branch, b, c respectively, is mainly used in gathering the real-time voltage value of 3 of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C; Described Diagnostic Strategy module judges for voltage acquisition point A, the voltage acquisition point B gathering according to voltage sample module, the magnitude of voltage of voltage acquisition point C whether each high-voltage connector occurs to disconnect or looseness fault; Described fault processing module is for receiving the diagnostic result that Diagnostic Strategy module is sent, and to the entire car controller signal that gives the alarm.
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 connected in series successively; Described high-risk grade connector group comprises main high voltage connector, described main high voltage connector is for connecting the main high voltage parts of power system normal operation, and setting voltage collection point A on last connector of main high voltage connector, and the extraction voltage sample line a of branch; Described general hazard level connector group comprises less important high-voltage connector, described less important high-voltage connector is for connecting the less important high voltage component of power system normal operation, and setting voltage collection point B on last connector of less important high-voltage connector, and the extraction voltage sample line b of branch; Described low hazard level connector group comprises other high-voltage connectors; Described other high-voltage connectors are for connecting the irrelevant of power system normal operation or without the high voltage component of obvious relation, and on last connector of other high-voltage connectors setting voltage collection point C, and the extraction voltage sample line c of branch.
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 voltage level value of the setting of described low voltage monitoring circuit is 12V; according to hazard level order from high to low, pass through successively high-risk grade connector group, general hazard level connector group, low hazard level connector group, and by the voltage sample module of the voltage sample line a of branch, b, c access high-pressure security protection system.
Described fault processing module, except being connected with Diagnostic Strategy module, is also connected with entire car controller, power brick power output relay control end; Described fault processing module and Diagnostic Strategy module link together, the fault judged result sending for accepting Diagnostic Strategy module; Described fault processing module is mainly to link together by CAN bus and entire car controller, for receiving the vehicle speed signal that entire car controller sends or sending alerting signal by CAN bus to entire car controller; Described fault processing module and power brick power output relay control end, for controlling the break-make of power brick power output relay; Described fault processing module is selected rational Security Techniques by the fault judged result receiving 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 2, trouble diagnosing: described Diagnostic Strategy module is set fault logic list according to the magnitude of voltage of 3 of gathered voltage acquisition point A, voltage acquisition point B, voltage acquisition point C, and carries out comparing; According to comparing result, judge whether high-voltage connector loosening or open failure occur; If item appears meeting in comparison result in fault logic list, there is loosening or open failure in current high-voltage connector, and the fault processing module that information is transmitted; If item does not appear meeting in comparison result in fault logic list, diagnosis is passed through;
Preferably, the described fault logic list row magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C of having passed the imperial examinations at the provincial level, and set different voltage and combined and reflect different fault causes;
Preferably, the only corresponding resultant fault grade of fault cause in described fault logic list; Generally, when the fault of the corresponding different brackets of different reasons, 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 are that fault loosening or that disconnection causes occurs the one or more connectors in described high-risk grade connector group; For in the situation that there is not three grades of faults in described secondary failure, in described general hazard level connector group, fault loosening or that disconnection causes occurs one or more connectors; Described level fault is not for occurring three grades, secondary failure in the situation that, and in described low hazard level connector group, one or more connectors occur loosening or disconnect the fault causing;
Preferably, choosing of described Security Techniques comprises the following steps:
A, described fault processing module obtain current vehicle speed value V by CAN bus from entire car controller;
The low speed threshold value of b, the setting speed of a motor vehicle is V1, if current vehicle speed value V is less than low speed threshold value 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 to entire car controller, send alarm message by CAN bus, 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, and 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 V is greater than or equal to V2 for d current vehicle speed value, and resultant fault grade is secondary, fault processing module still keeps high-voltage relay in closed state, but need take the also reminding user that certain safety measure reduces further to cause danger in time vehicle to be keeped in repair; As reduce 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 V is greater than or equal to V2 for e current vehicle speed value, and resultant fault grade is one-level, and fault processing module still keeps original high-voltage relay in closed state, only to entire car controller, sends a warning, and 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 speed threshold value V1, and resultant fault grade is three grades, 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 speed threshold value V1, and resultant fault grade is not three grades, first fault processing module judges that current vehicle speed V enters the velocity amplitude V ＇ at place before V1 and V2 interval, if vehicle velocity V ＇ is before in being more than or equal to V2 interval, while there is firsts and seconds fault, processing mode continuity steps d, e; If vehicle velocity V ＇ is before when being less than or equal to V1 interval, firsts and seconds fault occurs, 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 low voltage monitoring circuit is carried out to packet segmentation setting, simultaneously according to the high-voltage connector disconnection judgement hazard level in driving process, and makes in time early warning signal; The high-pressure security protection method that native system is set up mainly for the fault of surprisingly becoming flexible or disconnecting for high voltage connector of electric automobile; the fault level obtaining according to diagnosis; in conjunction with current vehicle working condition, choose rational fault handling measure, improve the safety of battery-driven car.
Accompanying drawing explanation
Fig. 1 is structural representation 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 that embodiments of the invention are set.
The specific embodiment
The invention will be further described for the embodiment providing 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 a voltage sample line a of branch, b, c; The described voltage sample line a of branch, b, c are electrically connected to voltage sample module respectively, are mainly used in gathering the real-time voltage value of 3 of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C; Described voltage sample module 4 is electrically connected to Diagnostic Strategy module 3, and described Diagnostic Strategy module 3 judges for voltage acquisition point A, the voltage acquisition point B gathering according to voltage sample module 4, the magnitude of voltage of voltage acquisition point C whether each high-voltage connector occurs to disconnect or looseness fault; Described Diagnostic Strategy module 3 is electrically connected to fault processing module 2, the diagnostic result that described fault processing module 2 sends for receiving Diagnostic Strategy module 3, and to the entire car controller signal that gives the alarm;
Described Diagnostic Strategy module 3 comprises master controller, and described master controller is provided with interface, comprises input/output interface (I/O interface), CAN bus interface, spi bus interface, for being connected with external module; Described master controller is connected with voltage acquisition module by I/O interface, in real time the voltage signal of receiver 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 collecting 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 analyzed;
Described fault processing module 2 comprises CAN bus transceiver and high-voltage relay driving circuit, is electrically connected respectively with input/output interface (I/O), the CAN bus interface 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 connected in series successively; Described high-risk grade connector group 8 comprises main high voltage connector, described main high voltage connector, for connecting the main high voltage parts of power system normal operation, specifically comprises high-tension battery bag connector 6, high pressure distribution box without protectors connector 7, electric machine controller connector 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 electric machine controller connector 9; Described electric machine controller connector 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 a of branch; Described general hazard level connector group 12 comprises less important high-voltage connector, and described less important high-voltage connector, for connecting the less important high voltage component of power system normal operation, 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 b of branch; Described low hazard level connector group 15 comprises other high-voltage connectors, is mainly used in connecting the irrelevant of power system normal operation 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 c of branch;
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 voltage level value of setting is 12V, according to hazard level order from high to low, pass through successively high-risk grade connector group 8, general hazard level connector group 12, low hazard level connector group 15, and by the voltage sample module 4 of the voltage sample line a of branch, b, c access high-pressure security protection system;
The wire harness placement policies that described low voltage monitoring circuit 5 adopts, can identify major failure source effectively; As shown in Figure 1, the low voltage level value of setting is 12V, and under normal circumstances, the voltage that voltage sample point A, B, C are 3 is 12V; During adding plug-in unit and produce loosening or open failure in high-risk grade connector group 8, 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 the interior connector of 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 remains unchanged, and is still 12V; When the interior connector of 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 relay control end; Described fault processing module 2 links together with Diagnostic Strategy module 3, the fault judged result sending for accepting Diagnostic Strategy module; Described fault processing module 2 is mainly to link together by CAN bus and entire car controller 1, for receiving the vehicle speed signal that entire car controller 1 sends or sending alerting signal by CAN bus to entire car controller 1; Described fault processing module 2 and power brick power output relay control end, for controlling the break-make of power brick power output relay; Described fault processing module 2 is selected rational Security Techniques by the fault judged result receiving 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 the described low voltage monitoring circuit 5 sample line a of Zhong Sange branch, the upper information of voltage of b, c, determine the magnitude of voltage of 3 of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C;
S2, trouble diagnosing: described Diagnostic Strategy module 3 is set fault logic list according to the magnitude of voltage of 3 of gathered voltage acquisition point A, voltage acquisition point B, voltage acquisition point C, and carries out comparing; According to comparing result, judge whether high-voltage connector loosening or open failure occur; If item appears meeting in comparison result in fault logic list, there is loosening or open failure in current high-voltage connector, and the fault processing module that information is transmitted; If item does not appear meeting in comparison result in fault logic list, diagnosis is passed through;
Preferably, as shown in table 1, the described fault logic list row magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C of having passed the imperial examinations at the provincial level, and set different voltage and combined and reflect different fault causes;
Preferably, as shown in table 1, the only corresponding resultant fault grade of fault cause in described fault logic list; Generally, when the fault of the corresponding different brackets of different reasons, 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 are that fault loosening or that disconnection causes occurs the one or more connectors in described high-risk grade connector group 8; For in the situation that there is not three grades of faults in described secondary failure, in described general hazard level connector group 12, fault loosening or that disconnection causes occurs one or more connectors; Described level fault is not for occurring three grades, secondary failure in the situation that, and the interior one or more connectors of described low hazard level connector group 15 occur loosening or disconnect the fault causing;
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 situation when vehicle in front, is chosen 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 bus from entire car controller 1;
The low speed threshold value of S32, the setting speed of a motor vehicle is V1=8km/h, if current vehicle speed value V is less than low speed threshold value 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 to entire car controller 1, send alarm message by CAN bus, warning light in instrument is lighted;
The High Speed Threshold of S33, the setting speed of a motor vehicle is V2=15 km/h; If current vehicle speed value V is greater than or equal to High Speed Threshold 15 km/h, and resultant fault grade is three grades, and fault processing module straight 2 connects cut off high relay and disconnects High voltage output, and sends a warning to entire car controller 1, and the indicator lamp of instrument carrier panel is lighted;
If V is greater than or equal to 15 km/h for S34 current vehicle speed value, and resultant fault grade is secondary, fault processing module 2 still keeps high-voltage relay in closed state, but need take the also reminding user that certain safety measure reduces further to cause danger in time vehicle to be keeped in repair; As reduce 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 V is greater than or equal to 15 km/h for S35 current vehicle speed value, and resultant fault grade is one-level, and fault processing module 2 still keeps original high-voltage relay in closed state, only to entire car controller 1, sends a warning, and warning light on instrument carrier panel is lighted;
If S36 current vehicle speed value V is but 15 km/h lower than High Speed Threshold higher than low speed threshold value 8km/h, and resultant fault grade is three grades, the direct cut off high relay of fault processing module 2 disconnects High voltage output, and sends a warning to entire car controller 1, and the indicator lamp of instrument carrier panel is lighted;
If S37 current vehicle speed value V is but 15 km/h lower than High Speed Threshold higher than low speed threshold value 8 km/h, and resultant fault grade is not three grades, first fault processing module 2 judges that current vehicle speed V enters the velocity amplitude V ＇ at place before 8km/h and 15 km/h intervals, if vehicle speed value V ＇ is before interval in being more than or equal to 15 km/h, while there is firsts and seconds fault, processing mode continuity step S34, S35; If vehicle velocity V ＇ is before interval in being less than or equal to 8 km/h, while there is firsts and seconds fault, processing mode continuity step S32, can reduce near speed of a motor vehicle sudden change of fault handling pattern during bob 8km/h or 15 km/h like this.
Claims (6)
1. an electric automobile high-voltage safety system, 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 a voltage sample line a of branch, b, c; The described voltage sample line a of branch, b, c are electrically connected to voltage sample module (4) respectively; Described voltage sample module (4) is electrically connected to Diagnostic Strategy module (3); Described Diagnostic Strategy module (3) is electrically connected to 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 bus interface, spi bus interface, for being connected with external module; Described master controller is connected with voltage acquisition module by I/O interface, in real time the voltage signal of receiver 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 collecting 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 analyzed;
Described fault processing module (2) comprises CAN bus transceiver and high-voltage relay driving circuit, is electrically connected respectively with input/output interface (I/O), the CAN bus interface of Diagnostic Strategy module.
2. a kind of electric automobile high-voltage safety system according to claim 1, it is characterized in that: described voltage sample module (4) is connected with the voltage sample line a of branch, b, c respectively, be mainly used in gathering the real-time voltage value of 3 of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C; Described Diagnostic Strategy module (3) judges for voltage acquisition point A, the voltage acquisition point B gathering according to voltage sample module, the magnitude of voltage of voltage acquisition point C whether each high-voltage connector occurs to disconnect or looseness fault; The diagnostic result that described fault processing module (2) sends for receiving Diagnostic Strategy module, and to the entire car controller signal that gives the alarm.
3. a kind of electric automobile high-voltage safety system 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 connected in series successively; Described high-risk grade connector group (8) comprises main high voltage connector, described main high voltage connector is for connecting the main high voltage parts of power system normal operation, and setting voltage collection point A on last connector of main high voltage connector, and the extraction voltage sample line a of branch; Described general hazard level connector group (12) comprises less important high-voltage connector, described less important high-voltage connector is for connecting the less important high voltage component of power system normal operation, and setting voltage collection point B on last connector of less important high-voltage connector, and the extraction voltage sample line b of branch; Described low hazard level connector group (15) comprises other high-voltage connectors; Described other high-voltage connectors are for connecting the irrelevant of power system normal operation or without the high voltage component of obvious relation, and on last connector of other high-voltage connectors setting voltage collection point C, and the extraction voltage sample line c of branch.
4. a kind of electric automobile high-voltage safety system 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 voltage level value of the setting of described low voltage monitoring circuit (5) is 12V; according to hazard level order from high to low, pass through successively high-risk grade connector group (8), general hazard level connector group (12), low hazard level connector group (15), and by the voltage sample module (4) of the voltage sample line a of branch, b, c access high-pressure security protection system.
5. a kind of electric automobile high-voltage safety system 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 relay control end; Described fault processing module (2) links together with Diagnostic Strategy module (3), the fault judged result sending for accepting Diagnostic Strategy module (3); Described fault processing module (2) is mainly to link together by CAN bus and entire car controller, for receiving the vehicle speed signal that entire car controller (1) sends or sending alerting signal by CAN bus to entire car controller (1); Described fault processing module (2) and power brick power output relay control end, for controlling the break-make of power brick power output relay; Described fault processing module (2) is selected rational Security Techniques by the fault judged result receiving in conjunction with the informix judgement of current vehicle speed.
6. a kind of electric automobile high-voltage method for security protection according to claim 1, is characterized in that: said method comprising the steps of:
Step 1, voltage acquisition: by voltage sample module (4), gather described low voltage monitoring circuit (5) the sample line a of Zhong Sange branch, the upper information of voltage of b, c, determine the magnitude of voltage of 3 of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C;
Step 2, trouble diagnosing: described Diagnostic Strategy module (3) is set fault logic list according to the magnitude of voltage of 3 of gathered voltage acquisition point A, voltage acquisition point B, voltage acquisition point C, and carries out comparing; According to comparing result, judge whether high-voltage connector loosening or open failure occur; If item appears meeting in comparison result in fault logic list, there is loosening or open failure in current high-voltage connector, and the fault processing module that information is transmitted; If item does not appear meeting in comparison result in fault logic list, diagnosis is passed through;
Preferably, the described fault logic list row magnitude of voltage of voltage acquisition point A, voltage acquisition point B, voltage acquisition point C of having passed the imperial examinations at the provincial level, and set different voltage and combined and reflect different fault causes;
Preferably, the only corresponding resultant fault grade of fault cause in described fault logic list; Generally, when the fault of the corresponding different brackets of different reasons, 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 are that fault loosening or that disconnection causes occurs the one or more connectors in described high-risk grade connector group; For in the situation that there is not three grades of faults in described secondary failure, in described general hazard level connector group, fault loosening or that disconnection causes occurs one or more connectors; Described level fault is not for occurring three grades, secondary failure in the situation that, and in described low hazard level connector group, one or more connectors occur loosening or disconnect the fault causing;
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 situation when vehicle in front, is chosen rational Security Techniques;
Preferably, choosing of described Security Techniques comprises the following steps:
A, described fault processing module (2) obtain current vehicle speed value V by CAN bus from entire car controller (1);
The low speed threshold value of b, the setting speed of a motor vehicle is V1, if current vehicle speed value V is less than low speed threshold value 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 to entire car controller (1), send alarm message by CAN bus, 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, fault processing module (2) directly cut off high relay disconnect High voltage output, and send a warning to entire car controller (1), the indicator lamp of instrument carrier panel is lighted;
If V is greater than or equal to V2 for d current vehicle speed value, and resultant fault grade is secondary, fault processing module (2) still keeps high-voltage relay in closed state, but need take the also reminding user that certain safety measure reduces further to cause danger in time vehicle to be keeped in repair; As reduce 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 V is greater than or equal to V2 for e current vehicle speed value, and resultant fault grade is one-level, fault processing module (2) still keeps original high-voltage relay in closed state, only to entire car controller (1), sends a warning, and 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 speed threshold value V1, and resultant fault grade is three grades, the direct cut off high relay of fault processing module (2) disconnects High voltage output, and sends a warning to entire car controller (1), 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 speed threshold value V1, and resultant fault grade is not three grades, fault processing module (2) first judges that current vehicle speed V enters the velocity amplitude V ＇ at place before V1 and V2 interval, if vehicle velocity V ＇ is before in being more than or equal to V2 interval, while there is firsts and seconds fault, processing mode continuity steps d, e; If vehicle velocity V ＇ is before when being less than or equal to V1 interval, firsts and seconds fault occurs, 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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