CN103448556A - Safe discharge method of new-energy vehicle capacitor electricity - Google Patents
Safe discharge method of new-energy vehicle capacitor electricity Download PDFInfo
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- CN103448556A CN103448556A CN2013104535010A CN201310453501A CN103448556A CN 103448556 A CN103448556 A CN 103448556A CN 2013104535010 A CN2013104535010 A CN 2013104535010A CN 201310453501 A CN201310453501 A CN 201310453501A CN 103448556 A CN103448556 A CN 103448556A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 title abstract description 6
- 230000005611 electricity Effects 0.000 title abstract description 4
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000003111 delayed effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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Abstract
The invention discloses a safe discharge method of new-energy vehicle capacitor electricity. The safe discharge method includes that when a complete vehicle is subjected to KEYOFF, an MCU (motor control unit) and a VMS (vehicle management system) are delayed for 500 milliseconds to determine that a relay is completely disconnected, the MCU applies 50A of current id to a shaft D of a motor and zero current to a shaft Q to prevent a motor rotor from shaking, and the electricity stored in a capacitor of the MCU is discharged completely by applying voltage to a motor winding. By means of load discharge, time for discharge can be shortened and safety is improved.
Description
Technical field
The invention belongs to the new-energy automobile security fields, relate to the safety management of electric capacity electric weight, be specifically related to a kind of method of controlling security of the new-energy automobile for the vent discharge electricity capacity, be applicable to pure electric automobile, hybrid vehicle, fuel cell powered vehicle.
Background technology
Be accompanied by the global economy development, the consumption of petroleum amount increases day by day, oil is as non-renewable resources, what just becoming is day by day in short supply, simultaneously under environmental pollution, various energy automobiles arise at the historic moment, and particularly oil-electric vehicle, pure electric automobile are vigorously advocated under the form of low-carbon (LC) life day by day universal in country.
Because the pure electric vehicle power system is different from traditional fuel-engined vehicle, power system comprises motor, controller, its main energy sources is from the battery system of several hectovolts, therefore, and for the safe handling of pure electric automobile, the Important Problems that maintenance problem becomes each large automobile vendor.The car load drive system is by motor, MCU, electrokinetic cell, VMS, storage battery, the DC/DC changer forms, MCU inverter control motor rotation wherein, energy source is from electrokinetic cell, control the work of MCU drive motor by the VMS vehicle management system, the input of DC/DC changer is the high voltage direct current from MCU, controlled the battery charge of exporting to of DC/DC by VMS, voltage when machine operation in the MCU internal capacitance is consistent with power high-tension battery voltage, when high-tension battery disconnects, after wanting a few minutes, the electric weight that in MCU, electric capacity stores could automatically release to zero volt, if the maintainer is when the high pressure Connector Clip of plug MCU during releasing, may cause the danger of electric shock, therefore when high-voltage relay disconnects, must be released by the very fast electric weight to electric capacity in MCU, avoid personnel to contact high pressure.
Summary of the invention
The present invention seeks to be to solve the maintainer after disconnecting high voltage dc bus, how the problem of the electric weight of electric capacity in the very fast MCU that releases, get an electric shock while avoiding dismounting MCU, high voltage dc bus, guarantees personal safety.
The present invention specifically discloses a kind of safety relief method of new-energy automobile electric capacity electric weight, comprises the steps:
1) after car load KEY OFF, MCU, VMS detect KEY OFF time delay 500ms, assert that relay disconnects;
2) MCU is by applying motor D axle one current value, and the Q shaft current is zero, and a voltage is applied on the motor winding, and the D shaft current applied makes rotor not produce shake;
3) whether MCU self detects trouble free and whether motor speed is less than 100rpm;
4) detect trouble free and motor speed is less than 100rpm as MCU self, MCU starts to carry out initiatively and releases and the timing t1 that starts to release, and whether judges t1 >=3s;
5) as judgement t1 >=during 3s, MCU judge bus voltage, if bus voltage V2 > 36V, determine that battery relay is sticky dead, actually do not disconnect, send the buzzing warning, exit the pattern of releasing; If bus voltage V2<=36V, MCU determines that battery relay disconnects, and exits the pattern of releasing, and completes and releases.
Wherein, when step 4) MCU execution is released, VMS enables DC/DC work, charges a battery.When judgement bus voltage V2<217V, stop DC/DC work.
Further, to be applied to the current value of motor D axle be 50A to MCU.
Wherein, when judging t1<3s in step 4), MCU continues to carry out release pattern MCU fault and motor speed are detected of electric capacity, exits the pattern of releasing when the two one does not satisfy condition.
The present invention, by there being load to release, can shorten the time of releasing, and improves safety.And, owing to not needing to carry out hardware modification, cost is almost nil.
The accompanying drawing explanation
Fig. 1: electric capacity bleed-off system block diagram;
Fig. 2: control flow chart;
Fig. 3: the non-loaded lower capacitance voltage diagram of curves of releasing;
Fig. 4: the capacitance voltage diagram of curves of releasing is arranged under load.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is specifically described.
As Fig. 1, car load is in normal operation, relay S1 is in closure state, battery provides the MCU(motor control unit) required voltage V1 carrys out drive motor operation, when the VMS(vehicle management system) when battery tension V3 being detected and being less than 13.8V, enabling DC/DC is battery charge, the input of DC/DC and MCU bus end join, this input voltage equals cell pressure V1, MCU bus voltage V2, i.e. V1=V2.
When car load KEY OFF(key is closed) after, MCU, VMS detect KEY OFF time delay 500ms, relay S1 disconnects, relay S1 disconnects the actual needs time in 500ms, so MCU, VMS want time delay 500ms to assert after relay disconnects fully, capacitor C 1 is released, avoid too fast being released to cause S1 to glue dead phenomenon.Now, MCU is 50A by applying motor D shaft current id, and the Q shaft current equals zero, and by applying voltage on the motor winding, so just can consume the electric weight that in MCU, capacitor C 1 stores, and the D shaft current applied is unlikely to make rotor to produce shake.
Then, whether MCU self detects trouble free, after judgement MCU trouble free and motor speed are less than 100rpm, MCU starts to carry out active and releases and start to release timing t1, as t1<3s, MCU continue to carry out release pattern MCU fault and motor speed are detected of electric capacity, when not satisfying condition, exits the two one the pattern of releasing, as t1 >=during 3s, MCU judges bus voltage, if V2 > 36V, judge that battery relay S1 is sticky dead, actual not disconnection, send buzzing and report to the police, and exits the pattern of releasing.As while judging bus voltage V2<=36V, MCU judgement battery relay S1 disconnects, and exits the pattern of releasing, and completes this time and releases.
Carry out and release simultaneously at MCU, VMS enables DC/DC work, charges a battery, and with this, consumes the electric weight that in MCU, capacitor C 1 stores, and auxiliary MCU carries out electric capacity and releases, and accelerates to release the time.Stop DC/DC work when judgement bus voltage V2<217V, otherwise continue to enable DC/DC work.
Figure 3 shows that electric capacity is released in without the external load situation, the about voltage V2 of electric capacity ≈ 340V own, release to 36V and need time 63S.In this case, probably cause maintainer's touching HV Terminal in maintenance MCU, the danger of electric shock is arranged, if simultaneously by the time capacitance voltage drops to below the human safety voltage, then when MCU is operated, lose time.
Fig. 4 is described to be released under same electrical is pressed with condition of loading for electric capacity, needs time 0.13s while releasing to 36V.Compare Fig. 3, under equal voltage conditions, capacitance voltage is released to 36V and has been improved nearly 62s, and the result of releasing in Fig. 4 shows to complete faster after car load KEY OFF to the releasing of capacitance voltage, and reduces the existence of danger as far as possible.
Claims (5)
1. the safety relief method of a new-energy automobile electric capacity electric weight, is characterized in that, comprises the steps:
1) after car load KEY OFF, MCU, VMS detect KEY OFF time delay 500ms, assert that relay disconnects;
2) MCU is by applying motor D axle one current value, and the Q shaft current is zero, and a voltage is applied on the motor winding, and the D shaft current applied makes rotor not produce shake;
3) whether MCU self detects trouble free and whether motor speed is less than 100rpm;
4) detect trouble free and motor speed is less than 100rpm as MCU self, MCU starts to carry out initiatively and releases and the timing t1 that starts to release, and whether judges t1 >=3s;
5) as judgement t1 >=during 3s, MCU judge bus voltage, if bus voltage V2 > 36V, determine that battery relay is sticky dead, actually do not disconnect, send the buzzing warning, exit the pattern of releasing; If bus voltage V2<=36V, MCU determines that battery relay disconnects, and exits the pattern of releasing, and completes and releases.
2. safety relief method according to claim 1 is characterized in that: when step 4) MCU carries out and releases, VMS enables DC/DC work, charges a battery.
3. safety relief method according to claim 2 is characterized in that: when judgement bus voltage V2<217V, stop DC/DC work.
4. according to the described safety relief method of claim 1-3 any one, it is characterized in that: the current value that MCU is applied to the motor D axle is 50A.
5. according to the described safety relief method of claim 1-4 any one, it is characterized in that: when judging t1<3s in step 4), MCU continue to carry out release pattern MCU fault and motor speed are detected of electric capacity, exits the pattern of releasing when the two one does not satisfy condition.
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| CN201310453501.0A CN103448556B (en) | 2013-09-29 | 2013-09-29 | A kind of safety relief method of new-energy automobile electric capacity electricity |
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| CN201310453501.0A CN103448556B (en) | 2013-09-29 | 2013-09-29 | A kind of safety relief method of new-energy automobile electric capacity electricity |
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| CN103448556B CN103448556B (en) | 2015-08-05 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105235525A (en) * | 2015-11-05 | 2016-01-13 | 株洲南车时代电气股份有限公司 | Discharging method of supporting capacitor of electric automobile driving system |
| CN107901762A (en) * | 2017-11-06 | 2018-04-13 | 北京长城华冠汽车科技股份有限公司 | Electric automobile is released crash handling method and system |
| CN109742933A (en) * | 2019-01-22 | 2019-05-10 | 浙江众邦机电科技有限公司 | A kind of motor driven systems and its auxiliary power-off system |
| CN110770071A (en) * | 2017-06-14 | 2020-02-07 | 菲尼克斯电动交通有限公司 | Detection method of insertion operation |
| CN111641198A (en) * | 2019-03-01 | 2020-09-08 | 杭州比亚迪汽车有限公司 | Motor controller, high-voltage bus capacitor discharge method and device thereof, and vehicle |
| CN112124078A (en) * | 2020-09-30 | 2020-12-25 | 潍柴动力股份有限公司 | Power-off control method and power-off control system of permanent magnet synchronous motor |
| CN112428822A (en) * | 2019-08-07 | 2021-03-02 | 北京新能源汽车股份有限公司 | Diagnosis control method and device and electric automobile |
| CN112977089A (en) * | 2021-03-11 | 2021-06-18 | 奇瑞新能源汽车股份有限公司 | High-voltage discharge method and device, vehicle control unit and new energy electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105235525A (en) * | 2015-11-05 | 2016-01-13 | 株洲南车时代电气股份有限公司 | Discharging method of supporting capacitor of electric automobile driving system |
| CN110770071A (en) * | 2017-06-14 | 2020-02-07 | 菲尼克斯电动交通有限公司 | Detection method of insertion operation |
| CN110770071B (en) * | 2017-06-14 | 2023-10-20 | 菲尼克斯电动交通有限公司 | Method for detecting insertion operation |
| CN107901762A (en) * | 2017-11-06 | 2018-04-13 | 北京长城华冠汽车科技股份有限公司 | Electric automobile is released crash handling method and system |
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| CN109742933A (en) * | 2019-01-22 | 2019-05-10 | 浙江众邦机电科技有限公司 | A kind of motor driven systems and its auxiliary power-off system |
| CN111641198A (en) * | 2019-03-01 | 2020-09-08 | 杭州比亚迪汽车有限公司 | Motor controller, high-voltage bus capacitor discharge method and device thereof, and vehicle |
| CN112428822A (en) * | 2019-08-07 | 2021-03-02 | 北京新能源汽车股份有限公司 | Diagnosis control method and device and electric automobile |
| CN112124078A (en) * | 2020-09-30 | 2020-12-25 | 潍柴动力股份有限公司 | Power-off control method and power-off control system of permanent magnet synchronous motor |
| CN112124078B (en) * | 2020-09-30 | 2022-04-26 | 潍柴动力股份有限公司 | Power-off control method and power-off control system of permanent magnet synchronous motor |
| CN112977089A (en) * | 2021-03-11 | 2021-06-18 | 奇瑞新能源汽车股份有限公司 | High-voltage discharge method and device, vehicle control unit and new energy electric vehicle |
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Owner name: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SAIC CHERY AUTOMOBILE CO., LTD. Effective date: 20150708 |
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Effective date of registration: 20150708 Address after: 241000 Yijiang, Anhui Province, Jin Hua Road, No. 226, South Road, No. Applicant after: New-energy automobile Technology Co., Ltd. of Cherry Address before: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Applicant before: Saic Chery Automobile Co., Ltd. |
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Address after: 241003 no.226, South Huajin Road, high tech Industrial Development Zone, Wuhu City, Anhui Province Patentee after: Chery New Energy Automobile Co.,Ltd. Address before: 241000 No. 226 Hua Jin South Road, Yijiang District, Anhui, Wuhu Patentee before: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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