CN105790677A - Motor controller overload protection method and system - Google Patents
Motor controller overload protection method and system Download PDFInfo
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- CN105790677A CN105790677A CN201610234557.0A CN201610234557A CN105790677A CN 105790677 A CN105790677 A CN 105790677A CN 201610234557 A CN201610234557 A CN 201610234557A CN 105790677 A CN105790677 A CN 105790677A
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- machine controller
- electric machine
- electric current
- overload
- current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Generators And Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a motor controller overload protection method and a motor controller overload protection system, which belong to the field of new energy automobile motor control technologies. The motor controller overload protection method comprises the steps of: detecting an output current of a motor controller, judging duration of the output current when an output current value is greater than a rated value, confirming whether overload is real, and achieving a ladder form derating measure through limiting current and judging the duration when an overload state is about to be reached, thereby preventing an overload power off protection state from being reached. The motor controller overload protection method and the motor controller overload protection system can allow a motor to reduce torque more smoothly in an overload state, have obvious buffer function for the overload state, effectively improve driving feeling of a new energy automobile, are free of sudden interruption of power, can reduce destructive effect of the motor in the overload state, prolong the service life of the motor, and enhance safety of vehicle driving of a driver.
Description
Technical field
The present invention relates to a kind of electric machine controller overload protection method and system, belong to New energy automobile motor and control technical field.
Background technology
New energy vehicle travels when different road conditions, and drive motor controller overload is one of common fault of new energy vehicle.When the output electric current of electric machine controller exceedes its output-current rating, and the persistent period exceedes the permission temperature rise of the internal IGBT of controller, and controller will be caused to transship.But being as motor speed frequently to change, cooling system water temperature changes along with variation of ambient temperature, thus radiating condition also can follow change.Simultaneously in controller speed regulation process, also there is very big fluctuation in current value, therefore the judgement for electric machine controller overload protection adds difficulty, once erroneous judgement, the disconnected power of vehicle can affect for the security performance of driver's driving vehicle.
Electric machine controller overload protection mechanism the more commonly used on new energy vehicle at present is when controller exports electric current overrate, it is judged that now whether current duration reaches overload time, if the persistent period is less than overload time, does not take protection；If the persistent period is more than overload time, disconnected power protection, namely this overload protection has anti-time limit characteristic.But the method also exists certain limitation, when driver family is when special road conditions, when motor is frequently in overload and non-overloaded switching state, overload conditions not easily judges, it addition, false protection also can the driving safety of serious threat driver.
Summary of the invention
It is an object of the invention to provide a kind of electric machine controller overload protection method and system, with in the problem needing to cause electric machine controller overload not easily to judge to special road conditions.
The present invention solves that above-mentioned technical problem provides a kind of electric machine controller overload protection method, the step of the method is as follows:
1) gather the output electric current of electric machine controller, and judge that whether the output electric current of electric machine controller is more than rated value；
2) when the output electric current of electric machine controller is more than rated value, detect the persistent period of this output electric current, and judge whether the persistent period reaches the corresponding maximum allowable time setting multiple；
3) if so, then reduce the output electric current of electric machine controller, and return step 1) in rejudge the magnitude relationship with rated value, circulation performs, until the output electric current of electric machine controller is less than rated value.
Described step 1) in the output electric current of electric machine controller less than rated value time, maintain the output electric current of electric machine controller, and exit overload protection mechanism.
The described maximum allowable time is the technical characteristic parameter according to the given IGBT of producer, and the heat generation characteristic under each current value is demarcated, and determined in conjunction with heat dissipation design.
Described step 2) if in the persistent period less than, then maintain electric machine controller output electric current, do not enter overload protection mechanism.
Described step 2) in set multiple as 0.7-0.9.
Present invention also offers a kind of electric machine controller overload protective device; this overload protective device includes acquisition module, judge module and execution module, and described acquisition module is for gathering the output electric current of electric machine controller and the persistent period when electric machine controller exports electric current more than rated value；Whether described judge module is used for the output electric current judging electric machine controller more than rated value, and judge more than whether the current duration of rated value reaches the corresponding maximum allowable time setting multiple, described execution module is for when namely the current duration of rated value is up to the corresponding maximum allowable time, reducing the output electric current of electric machine controller.
If the output electric current of electric machine controller is less than rated value, maintains the output electric current of electric machine controller, and exit overload protection mechanism.
The described maximum allowable time is the technical characteristic parameter according to the given IGBT of producer, and the heat generation characteristic under each current value is demarcated, and determine in conjunction with heat dissipation design.
If the persistent period less than, then maintain electric machine controller output electric current, do not enter overload protection mechanism.
Described judge module sets multiple as 0.7-0.9.
The invention has the beneficial effects as follows: the present invention is by detecting the output electric current of electric machine controller; when output current value is more than rated value; judge the persistent period of this output electric current; it is confirmed whether true overload; when being about to arrive overload; by restricting electric current and judge that the persistent period reaches the volume that the drops measure of stepped-style, thus avoiding reaching transshipping the guard mode of disconnected power.The present invention can make the reduction moment of torsion that motor more smoothes out under overload; overload is had obvious cushioning effect; not only effectively improve the driving sense of new-energy automobile; do not have the unexpected interruption of power; and the destruction that motor causes under overload can be protected; extend the service life of motor, improve the safety of driver vehicle.
Accompanying drawing explanation
Fig. 1 is the flow chart of electric machine controller overload protection method.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
A kind of embodiment of the electric machine controller overload protection method of the present invention
The present embodiment is directed to the electric machine controller of new energy vehicle; the present invention is by detecting the output electric current of electric machine controller; when output current value is more than rated current; judge its current duration; it is confirmed whether true overload; when being about to arrive overload, by restricting electric current and judge that the persistent period reaches the volume that the drops measure of stepped-style, to avoid reaching transshipping the guard mode of disconnected power.The method realize flow process as it is shown in figure 1, to be embodied as step as follows:
1. gather the output electric current of electric machine controller.
Start when car load runs, during electric machine controller normal operation, gathering the output electric current i of electric machine controller, the present embodiment monitors the three-phase motor stator electric current of electric machine controller output in real time by the Hall current sensor within electric machine controller, takes its instantaneous value as sampled value i.
2. set the three-phase rated current of electric machine controller output as Ie, it is judged that the electric current i gathered, whether more than rated value Ie, if it is less, maintain the output electric current of original motor controller, and exits overload protection mechanism.
If 3. more than rated current, then detection real-time current value institute persistent period t, it is judged that namely whether t be up to the corresponding maximum allowable time, being namely up to here refers to the maximum operation time reaching to set multiple, namely judges whether t meets following formula:
t≥aTmax
Wherein, t is the electric machine controller output electric current persistent period more than rated current；Tmax is the maximum allowable time, and a is for setting multiple, and for 0.7-0.9, choosing a in the present embodiment is 0.8.
Maximum allowable time Tmax is the technical characteristic parameter in conjunction with the IGBT given by producer, the heat generation characteristic under each current value is demarcated, and is determined in conjunction with heat dissipation design.In use, the corresponding maximum allowable time that the electric machine controller determined need to export electric current is entered in software program as known quantity.
The maximum allowable time Tmax control algolithm of electric machine controller IGBT temperature rise is different.Method the more commonly used at present: (1). carry out software modeling emulation according to parameters such as the concrete property parameter of the adopted manufacturer IGBT of electric machine controller and real vehicle cooling system flows, draw along with the increase of IGBT inflow current, when inflow current overrate, electric current with allow persistent period exponentially functional relationship.(2). electric machine controller is assembled complete, cool down according to car load actual heat radiation standard, pass into some somes current values (more than rated current), measure the permission persistent period reaching IGBT junction temperature peak respectively.(3). the measured value that these allow the persistent period is updated to the exponential function that analogue simulation goes out, utilizes interpolation method matching to obtain unknown quantity, draw function algorithm.The function algorithm write motor obtained is controlled program, the input current according to Real-time Collection by the present invention, can calculate the maximum allowable persistent period of corresponding current.
If 4., then reduce the output electric current of electric machine controller, reduce the 5%-10% of primary current every time, and return step 2, rejudging the magnitude relationship of the output electric current and the rated value that reduce rear motor controller, circulation performs, and makes output electric current be stepped decline, reach the purpose of the volume of dropping, until electric machine controller returns to normal output electric current and runs.
A kind of embodiment of the electric machine controller overload protective device of the present invention
The electric machine controller overload protective device of the present invention includes acquisition module, judge module and execution module, wherein acquisition module is for gathering the output electric current of electric machine controller, and the persistent period when electric machine controller exports electric current more than rated value, whether judge module is used for the output electric current judging electric machine controller more than rated value, and judge more than whether the current duration of rated value reaches the corresponding setting multiple maximum allowable time, perform module and be used for when the maximum allowable time of setting multiple corresponding to the current duration of rated value reaches, reduce the output electric current of electric machine controller.The process that implements of this system modules has been described in detail in the embodiment of method, repeats no more here.
Above example is only adapted to assist in the core concept understanding the present invention; the present invention can not be limited with this; for those skilled in the art; every thought according to the present invention; the present invention is modified or equivalent replacement; the any change done in specific embodiments and applications, should be included in protection scope of the present invention.
Claims (10)
1. an electric machine controller overload protection method, it is characterised in that the step of this guard method is as follows:
1) gather the output electric current of electric machine controller, and judge that whether the output electric current of electric machine controller is more than rated value；
2) when the output electric current of electric machine controller is more than rated value, detect the persistent period of this output electric current, and judge whether the persistent period reaches the corresponding maximum allowable time setting multiple；
3) if so, then reduce the output electric current of electric machine controller, and return step 1) in rejudge the magnitude relationship with rated value, circulation performs, until the output electric current of electric machine controller is less than rated value.
2. electric machine controller overload protection method according to claim 1, it is characterised in that described step 1) in the output electric current of electric machine controller less than rated value time, maintain the output electric current of electric machine controller, and exit overload protection mechanism.
3. electric machine controller overload protection method according to claim 1; it is characterized in that; the described maximum allowable time is the technical characteristic parameter according to the given IGBT of producer, and the heat generation characteristic under each current value is demarcated, and determined in conjunction with heat dissipation design.
4. electric machine controller overload protection method according to claim 1, it is characterised in that described step 2) if in the persistent period less than, then maintain electric machine controller output electric current, do not enter overload protection mechanism.
5. electric machine controller overload protection method according to claim 1, it is characterised in that described step 2) in set multiple as 0.7-0.9.
6. an electric machine controller overload protective device; it is characterized in that; this overload protective device includes acquisition module, judge module and execution module, and described acquisition module is for gathering the output electric current of electric machine controller and the persistent period when electric machine controller exports electric current more than rated value；Whether described judge module is used for the output electric current judging electric machine controller more than rated value, and judge more than whether the current duration of rated value reaches the corresponding maximum allowable time setting multiple, described execution module is for when namely the current duration of rated value is up to the corresponding maximum allowable time, reducing the output electric current of electric machine controller.
7. electric machine controller overload protective device according to claim 6, it is characterised in that if the output electric current of electric machine controller is less than rated value, maintains the output electric current of electric machine controller, and exits overload protection mechanism.
8. electric machine controller overload protective device according to claim 6, it is characterised in that the described maximum allowable time is the technical characteristic parameter according to the given IGBT of producer, and the heat generation characteristic under each current value is demarcated, and determine in conjunction with heat dissipation design.
9. electric machine controller overload protective device according to claim 6, it is characterised in that if the persistent period less than, then maintain electric machine controller output electric current, do not enter overload protection mechanism.
10. electric machine controller overload protective device according to claim 6, it is characterised in that set multiple as 0.7-0.9 in described judge module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610234557.0A CN105790677A (en) | 2016-04-15 | 2016-04-15 | Motor controller overload protection method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610234557.0A CN105790677A (en) | 2016-04-15 | 2016-04-15 | Motor controller overload protection method and system |
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| CN105790677A true CN105790677A (en) | 2016-07-20 |
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| CN201610234557.0A Pending CN105790677A (en) | 2016-04-15 | 2016-04-15 | Motor controller overload protection method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108069013A (en) * | 2016-11-14 | 2018-05-25 | 托奇多有限责任公司 | For the equipment of the traveling gear grade of the Vidacare corp of predetermined ship |
| CN114083989A (en) * | 2021-12-24 | 2022-02-25 | 天津英捷利汽车技术有限责任公司 | Current inverse time limit protection method for pure electric vehicle |
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| US20060250154A1 (en) * | 2005-05-09 | 2006-11-09 | Square D Company | Electronic overload relay for mains-fed induction motors |
| CN101141107A (en) * | 2006-09-04 | 2008-03-12 | 希尔蒂股份公司 | Method for actuating a motor |
| CN101527534A (en) * | 2008-03-04 | 2009-09-09 | C.&E.泛音有限公司 | Asynchronous engine and method for operating same on a frequency transformer |
| CN102856884A (en) * | 2012-09-17 | 2013-01-02 | 中冶南方（武汉）自动化有限公司 | Heat accumulation based frequency converter overload method |
| CN104836205A (en) * | 2015-05-29 | 2015-08-12 | 许继集团有限公司 | Motor overload protection method and motor control system using method |
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2016
- 2016-04-15 CN CN201610234557.0A patent/CN105790677A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060250154A1 (en) * | 2005-05-09 | 2006-11-09 | Square D Company | Electronic overload relay for mains-fed induction motors |
| CN101141107A (en) * | 2006-09-04 | 2008-03-12 | 希尔蒂股份公司 | Method for actuating a motor |
| CN101527534A (en) * | 2008-03-04 | 2009-09-09 | C.&E.泛音有限公司 | Asynchronous engine and method for operating same on a frequency transformer |
| CN102856884A (en) * | 2012-09-17 | 2013-01-02 | 中冶南方（武汉）自动化有限公司 | Heat accumulation based frequency converter overload method |
| CN104836205A (en) * | 2015-05-29 | 2015-08-12 | 许继集团有限公司 | Motor overload protection method and motor control system using method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108069013A (en) * | 2016-11-14 | 2018-05-25 | 托奇多有限责任公司 | For the equipment of the traveling gear grade of the Vidacare corp of predetermined ship |
| CN114083989A (en) * | 2021-12-24 | 2022-02-25 | 天津英捷利汽车技术有限责任公司 | Current inverse time limit protection method for pure electric vehicle |
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Application publication date: 20160720 |