CN102386655B - A kind of pre-charging control method for vehicle motor controller - Google Patents
A kind of pre-charging control method for vehicle motor controller Download PDFInfo
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- CN102386655B CN102386655B CN201110357082.1A CN201110357082A CN102386655B CN 102386655 B CN102386655 B CN 102386655B CN 201110357082 A CN201110357082 A CN 201110357082A CN 102386655 B CN102386655 B CN 102386655B
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Abstract
The present invention relates to a kind of pre-charging control method for vehicle motor controller, twice measured value before being started by precharge and after starting is contrasted, judge whether that precharge starts, twice measured value after being started by precharge and after terminating is contrasted, and judges whether precharge completes.Method of the present invention does not rely on complicated testing circuit, on the basis of existing testing circuit, by the improvement to precharging circuit DC bus-bar voltage collection judgment mode, realize accurately judging that precharge starts and completes, practical, flexible configuration, improves the safety and reliability of electric machine controller and New-energy electric vehicle car load.Adopt the electric machine controller precision of the inventive method high, control point is few, and system is simple and reliable, and fault point is few; Electric machine controller is while completing precharge control, and also add diagnostic function, reliability is high.
Description
Technical field
The present invention relates to a kind of pre-charging control method for vehicle motor controller.
Background technology
Vehicle motor controller is one of New-energy electric vehicle kernel component, is the critical component direct current of the energy storage device such as vehicle mounted dynamic battery or super capacitor being converted to drive motors three-phase alternating current used.As shown in Figure 1, namely described vehicle motor controller is inverter section in figure, and its DC side has jumbo electric capacity C1, therefore step response can occur when power supply and electric machine controller are connected, and causes electric machine controller DC bus produces transient high-current.The impact of long-term transient high-current, the useful life of main contactor, electric machine controller DC bus fast acting fuse and filter capacitor can be reduced, so need for electric machine controller increases pre-charge circuit, as contactor KM1, KM2 in DC loop in figure, in parallel with KM1 after pre-charge resistance R1, R1 and KM2 series connection, the main process of precharge is: first closed KM2, carry out precharge, after precharge completes, disconnect KM2, closed KM1.In figure, dotted line frame inside is divided into electric machine controller.
The precharge control strategy of prior art, for the judgement that precharge completes, is divided into three kinds substantially: 1, gather electric machine controller DC bus current, when DC bus current exports preliminary filling settling signal close to during 0A; 2, gathered the voltage of onboard power power supply by independent power-supply management system, then utilize bus communication that supply voltage value is sent to electric machine controller and compare, when two place's voltages are tending towards equal, export preliminary filling settling signal; 3, gather electric machine controller DC bus-bar voltage, reach under-voltage protection point when DC bus-bar voltage reaches setting, after time delay, export preliminary filling settling signal.Due to the problem such as accuracy error, onboard power power-supply management system consistency of current sensor and voltage and current sampling circuit, during possible electric machine controller output preliminary filling settling signal, actual precharge does not complete, onboard power power supply and electric machine controller DC bus is caused to there is voltage difference, do not eliminate the risk that transient high-current impacts, affect the safety and reliability of electric machine controller, or actual precharge completes already during output precharge settling signal, cause reducing control efficiency.
Summary of the invention
The object of this invention is to provide a kind of precharge control method, in order to solve, judgement that prior art precharge completes is inaccurate causes the low or inefficient problem of controller secure.
For achieving the above object, the solution of the present invention is: a kind of pre-charging control method for vehicle motor controller, is characterized in that, step is as follows:
A, gathers busbar voltage before precharge starts, is designated as VC1-1, then starts precharge;
B, time delay t1, gathers busbar voltage again, is designated as VC1-2; Judge whether first difference of VC1-2 and VC1-1 is greater than the first set point K1;
C, if the first difference is greater than K1, then judges that DC bus precharge starts, and performs steps d; If be not more than K1, then perform step b, until the first difference is greater than K1, or when t1 time delay number of times reaches the first set point number, stop precharge;
D, time delay t2, gather busbar voltage, be designated as VC1-3; Judge whether second difference of VC1-3 and VC1-2 is less than the second set point K2;
E, if the second difference is less than K2, then judge that DC bus precharge completes, terminate precharge, major loop puts into operation; If the second difference is not less than K2, then circulation performs steps d, until the second difference is less than K2, or when t2 time delay number of times reaches the second set point number, terminates precharge.
In described step e, if t2 time delay number of times reaches the second set point number, described second difference is still not less than K2, then the collection value VC1-3 recorded now is used for carrying out processing rear output Acquisition Circuit accuracy error and reports to the police.
Vehicle motor controller precharge control program proposed by the invention, do not rely on complicated testing circuit, on the basis of existing testing circuit, by the improvement to precharging circuit DC bus-bar voltage collection judgment mode, realize accurately judging that precharge starts and completes, practical, flexible configuration, improves the safety and reliability of electric machine controller and New-energy electric vehicle car load.Adopt the electric machine controller precision of the inventive method high, control point is few, and system is simple and reliable, and fault point is few; Electric machine controller is while completing precharge control, and also add diagnostic function, reliability is high.
Accompanying drawing explanation
Fig. 1 is vehicle motor controller circuit diagram;
Fig. 2 is precharge control flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
As Fig. 1, main loop comprises onboard power power supply V1, onboard power power supply V1 is by pre-charge circuit (preliminary filling resistance R1, main contactor KM1, pre-charge contactor KM2) connection bus electric capacity C1, and bus capacitor connects inverter circuit (power model V1-V6).System also comprises sample circuit and controller, and controller controls to implement this control method of the present invention.
A concrete rate-determining steps is as follows:
Wherein, DC bus-bar voltage be VC1, VC1-1, VC1-2, VC1-3 represent respectively precharge start before, after precharge, three collection capacities terminating of precharge.Counter is used for recording times of collection.
A counter C1 is set and clear 0, gathers DC bus-bar voltage VC1-1; Then adhesive pre-charge contactor KM2, starts to carry out precharge.Now onboard power power supply V1, charges to DC bus filter capacitor C1 after preliminary filling resistance R1 current limliting.
Through the time delay of t1 time, again gather electric machine controller DC bus-bar voltage VC1-2, counter C1 adds 1.
Relatively VC1-2 and VC1-1, if difference is greater than specification error value K1, judges that DC bus precharge starts, performs step 4; If difference is not more than specification error value K1, judge whether Counter Value equals 3.If be not equal to 3, perform step 2; If equal 3, judge precharging circuit line fault, disconnect pre-charge contactor KM2, terminate precharge.
Counter C1 clear 0.
Through the time delay of t2 time, again gather electric machine controller DC bus-bar voltage VC1-3, counter C1 adds 1.
Relatively VC1-3 and VC1-2, if difference is less than specification error value K2, judges that DC bus precharge completes, performs step 8; If difference is not less than specification error value K2, stores VC1-3(and this value put into certain memory space), judge whether Counter Value equals 3.If be not equal to 3, perform step 5; If equal 3, perform step 7.
Export Acquisition Circuit accuracy error to report to the police.
Adhesive main contactor KM1, disconnect pre-charge contactor KM2, electric machine controller precharge completes.
Respective flow chart is shown in Fig. 2.
Main points of the present invention are: twice measured value before being started by precharge and after starting is contrasted, and judges whether that precharge starts, and twice measured value after being started by precharge and after terminating is contrasted, and judges whether precharge completes.
As other embodiments, in fact counter can arrange two, and one, for 1-3 step, is carried out the record of VC1-2 times of collection (i.e. t1 time delay number of times); Another walks for 5-8, carries out the record of the times of collection (i.e. t2 time delay number of times) of VC1-3.
Delay time t1 rule of thumb records the number of times limit (i.e. the first set point number) and determines with the VC1-2 of specification error value K1, setting, as in above-described embodiment, the record number of times limit of VC1-2 is 3, if namely within time delay 2 t1, all can perform downwards.In like manner, the value of t2 should consider the record number of times limit (i.e. the second set point number) of K2, VC1-3.In above embodiment, the record number of times limit of VC1-3 is also 3.The object storing VC1-3 is utilize this value to calculate and export the accuracy error of Acquisition Circuit, belongs to expanded function.Due to each by VC1-3 stored in same memory space, so final VC1-3 reaches precharge to complete collection value VC1-3 when judging number of times, carry out processing the warning of rear output Acquisition Circuit accuracy error.
Claims (2)
1. a pre-charging control method for vehicle motor controller, is characterized in that, step is as follows:
A, gathers busbar voltage before precharge starts, is designated as VC1-1, then starts precharge;
B, time delay t1, gathers busbar voltage again, is designated as VC1-2; Judge whether first difference of VC1-2 and VC1-1 is greater than the first set point K1;
C, if the first difference is greater than K1, then judges that DC bus precharge starts, and performs steps d; If be not more than K1, then perform step b, until the first difference is greater than K1, or when t1 time delay number of times reaches the first set point number, stop precharge;
D, time delay t2, gather busbar voltage, be designated as VC1-3; Judge whether second difference of VC1-3 and VC1-2 is less than the second set point K2;
E, if the second difference is less than K2, then judge that DC bus precharge completes, terminate precharge, major loop puts into operation; If the second difference is not less than K2, then circulation performs steps d, until the second difference is less than K2, or when t2 time delay number of times reaches the second set point number, terminates precharge.
2. a kind of pre-charging control method for vehicle motor controller according to claim 1, it is characterized in that, in described step e, if t2 time delay number of times reaches the second set point number, described second difference is still not less than K2, then the collection value VC1-3 recorded now is used for carrying out processing rear output Acquisition Circuit accuracy error and reports to the police.
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| CN201110357082.1A CN102386655B (en) | 2011-11-11 | 2011-11-11 | A kind of pre-charging control method for vehicle motor controller |
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| CN102386655B true CN102386655B (en) | 2016-02-17 |
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| CN103895524B (en) * | 2012-12-27 | 2017-10-31 | 比亚迪股份有限公司 | The drive system and its drive control method of a kind of electric motor coach |
| JP6255691B2 (en) * | 2013-03-29 | 2018-01-10 | 株式会社ケーヒン | Current sensor / contactor unit |
| JP2016046851A (en) | 2014-08-20 | 2016-04-04 | スズキ株式会社 | Power supply |
| CN104201747B (en) * | 2014-09-25 | 2016-08-24 | 北京现代汽车有限公司 | A kind of electric automobile trickle charge open circuit fault processing method and processing device |
| CN104868516B (en) * | 2014-12-19 | 2018-01-19 | 北汽福田汽车股份有限公司 | A kind of battery pre-charging guard method and device |
| CN106204930A (en) * | 2016-08-19 | 2016-12-07 | 北京智充科技有限公司 | A kind of charging pile time delay Fare Collection System and method |
| CN107546972A (en) * | 2017-10-23 | 2018-01-05 | 安徽栋霖电气有限公司 | A kind of integrated electric machine controller pre-charge method |
| CN110445234A (en) * | 2019-01-14 | 2019-11-12 | 苏州市万松电气有限公司 | A kind of train charger |
| CN110254234A (en) * | 2019-05-27 | 2019-09-20 | 深圳熙斯特新能源技术有限公司 | A kind of controller main contactor adhesion detection method based on preliminary filling circuit |
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Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: 450016 Yutong Industrial Zone, eighteen Li River, Henan, Zhengzhou Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |