CN114083989A - Current inverse time limit protection method for pure electric vehicle - Google Patents
Current inverse time limit protection method for pure electric vehicle Download PDFInfo
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- CN114083989A CN114083989A CN202111604016.XA CN202111604016A CN114083989A CN 114083989 A CN114083989 A CN 114083989A CN 202111604016 A CN202111604016 A CN 202111604016A CN 114083989 A CN114083989 A CN 114083989A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
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Abstract
The invention provides a current inverse time limit protection method of a pure electric vehicle, which comprises the following steps: calculating corresponding thermal speed value V through real-time current overload multipleCalor(ii) a According to the current value V of the heat speedCalorThe motor controller accumulates V once every n msCalorObtaining a real-time total heat accumulated value S1(ii) a According to the overload multiple x allowed by the motor controller and the allowable overload duration T1Obtaining the allowable total heat accumulation value S2When the real-time total heat accumulated value S1If the total heat accumulation value is larger than the allowable total heat accumulation value, the maximum torque is reduced and output is performed; when the real-time overload multiple of the current is less than 1, the real-time total heat accumulated value S1Reducing, real-time total heat accumulation value S1Reduced to the artificial set value S3And adjusting the torque power value output by the controller to be the maximum value. The invention can fit the current temperature characteristic curve of the motor controller by the maximum program, effectively protects the motor controller and keeps the performance output of the power system as much as possible.
Description
Technical Field
The invention belongs to the field of electric automobile power, and particularly relates to a current inverse time limit protection method for a pure electric automobile.
Background
The operation working condition of the electric automobile is complex, the electric automobile can be operated in a working condition of frequent continuous climbing, the electric automobile is designed according to the requirements of a power system of a legal electric automobile, the peak torque is kept for 1min during operation, then the torque output can be reduced, the continuous output time of the power device is different under different current values according to the output characteristic of the power device, the larger the current value of the power device is, the shorter the allowed output time is, and in order to better fit the output characteristic, the design of a sustainable characteristic curve with different currents has important significance for analyzing the continuous climbing working condition of the pure electric automobile.
Disclosure of Invention
In view of this, the present invention provides a current inverse time-lag protection method for a pure electric vehicle, so as to solve the problem that the power characteristics of the electric vehicle are inconvenient to analyze due to the influence of a current value on the continuous output time of a power device of the existing electric vehicle under a continuous climbing condition.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a current inverse time limit protection method of a pure electric vehicle comprises the following specific steps:
s1, obtaining the rated current I continuously allowed by the motor controllerANAnd the current real-time current I of the motor controllercurrentCalculating the current heat speed value V of the motor controllerCalor；
S2, according to the V corresponding to the real-time current overload multiple in the step S1CalorThe motor controller calculates the real-time total heat accumulated value S every n ms1；
S3, overload multiple x allowed according to motor controller and overload duration T allowed1Obtaining the allowable total heat accumulation value S2When the real-time total heat accumulated value S1Greater than the allowable total heat accumulation value S2Then, thenCarrying out torque reduction output; when the real-time overload multiple of the current is less than 1, the real-time total heat accumulated value S1Reducing, real-time total heat accumulation value S1Reduced to the artificial set value S3Then the controller output is adjusted to the torque power maximum.
Further, the current heat speed value V of the motor controllerCalorThe calculation formula is as follows:
Further, the motor controller calculates the current real-time total heat accumulated value S once every n ms1The calculation formula is as follows:
m is the accumulated value T of the current total heat quantitysumNumber of times of real-time overload duration T1Divided by n.
Further, in step S3, the specific calculation formula of the total heat accumulated value is allowed to be:
S2＝(x2-1)*1024*T1/n。
further, in step S3, the artificial set value determination method includes:
artificially setting the overload factor y and the duration T at the set overload factor2Setting the overload multiple to be less than 1;
the specific calculation formula of the artificial set value is as follows:
S3＝[(x2-1)*1024*T1/n]-[(y2-1)*1024*T2/n]。
compared with the prior art, the current inverse time limit protection method of the pure electric vehicle has the following beneficial effects:
(1) the current inverse time limit protection method of the pure electric vehicle is simple in calculation method, can fit the current temperature characteristic curve of the power device of the motor controller with the maximum program, and can effectively protect the temperature of the power device of the motor controller.
(2) According to the current inverse time limit protection method of the pure electric vehicle, in the first process, when the real-time total heat accumulated value is larger than the allowable total heat accumulated value, torque reduction output is carried out, the temperature of a motor controller is not too high, and the motor controller is prevented from being damaged due to over-temperature; when the real-time total heat accumulated value of the controller is lower than an artificial set value, the temperature is reduced to a proper temperature, the motor controller is controlled to output a maximum torque power value, and the running performance of the electric vehicle is improved; and circulating the two processes to keep the balance of the temperature safety of the motor controller and the running performance of the electric automobile.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram illustrating a relationship between a current overload multiple and a thermal speed according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, 1. a current inverse time-limit protection method for a pure electric vehicle, is characterized in that: the method comprises the following specific steps:
s1, obtaining the rated current I continuously allowed by the motor controllerANAnd the current real-time current I of the motor controllercurrentCalculating the current heat speed value V of the motor controllerCalor；
S2, according to the V corresponding to the real-time current overload multiple in the step S1CalorThe motor controller calculates the real-time total heat accumulated value S every n ms1；
S3, overload multiple x allowed according to motor controller and overload duration T allowed1Obtaining the allowable total heat accumulation value S2When the real-time total heat accumulated value S1Greater than the allowable total heat accumulation value S2If so, carrying out torque reduction output; when the real-time overload multiple of the current is less than 1, the real-time total heat accumulated value S1Reducing, real-time total heat accumulation value S1Reduced to the artificial set value S3Then the controller output is adjusted to the torque power maximum.
As shown in fig. 1, the current value V of the heat speed of the motor controllerCalorThe calculation formula is as follows:
When the actual current is larger than the rated current, TCalorThe positive value represents that the controller generates heat and the T is calculated when the ratio of the actual current to the rated current is largerCalorThe greater the value of the thermal speed; when the actual current is less than the rated current, TCalorThe negative value represents that the controller calculates T when the heat is consumed and the ratio of the actual current to the rated current is smallerCalorThe smaller the value of the thermal velocity of (c).
The motor controller calculates the current real-time total heat accumulated value S once every n ms1The calculation formula is as follows:
m is the accumulated value T of the current total heat quantitysumNumber of times of real-time overload duration T1Divided by n.
In step S3, the specific calculation formula of the allowable total heat amount accumulation value is:
S2＝(x2-1)*1024*T1/n
in step S3, the artificial set value determination method includes:
artificially setting the overload factor y and the duration T at the set overload factor2Setting the overload multiple to be less than 1;
the specific calculation formula of the artificial set value is as follows:
S3＝[(x2-1)*1024*T1/n]-[(y2-1)*1024*T2/n]。
assuming that the motor controller allows 3 times overload of current and the duration is allowed to be 30S, the allowable heat speed value 8192 corresponding to the 3 times overload is accumulated every 50ms according to the formula, and the allowable total heat accumulated value S2Corresponding to 4195200, when S is detected1When the current overload multiple is more than 4195200, the torque is reduced and output is performed, and if the current overload multiple is less than 1, the real-time total heat accumulated value S is obtained1Will be reduced and when reduced to a certain value will allow the controller to resume outputting the maximum torque power.
Allowable heat speed value 8192, and the specific calculation process is as follows:
[32-1]*1024＝[9-1]*1024＝8*1024＝8192；
allowable total heat quantity accumulation value S2To 4195200, the specific calculation process is as follows:
when the motor controller allows a current overload of 3 times, the duration is allowed to be 30s, the heat calculation period is 50ms,
the heat 8192 is accumulated once every 50ms, and the total heat accumulation value S is allowed to be 30S after 600 times of 50ms (600 x 50ms 30000ms)2＝8192*600＝4195200；
If the real-time current overload multiple is smaller than 1, the real-time total heat accumulated value S is obtained1Will be reduced and when reduced to the override value will allow the controller to resume outputting the torque power maximum.
For example, the overload factor is 0.8
Cumulative acceleration of real-time heat to [0.8 ]2-1]*1024＝[0.64-1]*1024＝(-0.36)*1024＝-368；
At this time, the total heat quantity accumulated value S14195200 every 50ms1＝4195200-368＝4194832；S1Will gradually decrease, the closer the current overload multiple is to 0, S1The faster the rate of reduction;
in the artificial set value, setting the overload multiple to be 0.8 for 30s continuously, and recovering the maximum value of the output torque power of the controller, namely executing the overload multiple for 600 times and 50ms to 368; the total heat is 4195200-; therefore, when the total heat quantity is reduced to 3974400, the maximum value of the output torque power of the controller is recovered, the dynamic property of the whole vehicle is effectively exerted, and meanwhile, the controller can be effectively protected from being damaged due to heat accumulation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A current inverse time limit protection method of a pure electric vehicle is characterized by comprising the following steps: the method comprises the following specific steps:
s1, obtaining the rated current I continuously allowed by the motor controllerANAnd the current real-time current I of the motor controllercurrentCalculating the current heat speed value V of the motor controllerCalor；
S2, according to the V corresponding to the real-time current overload multiple in the step S1CalorThe motor controller calculates the real-time total heat accumulated value S every n ms1；
S3, overload multiple x allowed according to motor controller and overload duration T allowed1Obtaining the allowable total heat accumulation value S2When the real-time total heat accumulated value S1Greater than the allowable total heat accumulation value S2If so, carrying out torque reduction output; when the real-time overload multiple of the current is less than 1, the real-time total heat accumulated value S1Reducing, real-time total heat accumulation value S1Reduced to the artificial set value S3Then the controller output is adjusted to the torque power maximum.
2. The current inverse time limit protection method of the pure electric vehicle according to claim 1, characterized in that: current value of heat speed V of motor controllerCalorThe calculation formula is as follows:
3. The current inverse time limit protection method of the pure electric vehicle according to claim 1, characterized in that: the motor controller calculates the current real-time total heat accumulated value S once every n ms1The calculation formula is as follows:
m is the accumulated value T of the current total heat quantitysumNumber of times of real-time overload duration T1Divided by n.
4. The current inverse time limit protection method of the pure electric vehicle according to claim 1, characterized in that: in step S3, the specific calculation formula of the allowable total heat amount accumulation value is:
S2＝(x2-1)*1024*T1/n。
5. the current inverse time limit protection method of the pure electric vehicle according to claim 2, characterized in that: in step S3, the artificial set value determination method includes:
artificially setting the overload factor y and the duration T at the set overload factor2Setting the overload multiple to be less than 1;
the specific calculation formula of the artificial set value is as follows:
S3＝[(s2-1)*1024*T1/n]-[(y2-1)*1024*T2/n]。
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