CN114312317B - Automobile motor locked rotor protection method and device and automobile - Google Patents
Automobile motor locked rotor protection method and device and automobile Download PDFInfo
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- CN114312317B CN114312317B CN202011065221.9A CN202011065221A CN114312317B CN 114312317 B CN114312317 B CN 114312317B CN 202011065221 A CN202011065221 A CN 202011065221A CN 114312317 B CN114312317 B CN 114312317B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the field of automobile power systems, and discloses an automobile motor locked rotor protection method and device and an automobile, wherein the method comprises the following steps: obtaining the output torque of an automobile motor according to a designated sampling period; determining a first torque of the motor according to a preset limiting strategy and the output torque; determining a second torque of the motor according to the motor temperature and the output torque of the motor; determining a third torque of the motor according to the inverter temperature and the output torque of the automobile inverter; selecting the minimum torque among the first torque, the second torque and the third torque as the locked-rotor protection torque; and setting external characteristic data of the motor according to the locked rotor protection torque. The invention can improve the detection capability and the accuracy of the motor locked-rotor working condition and reduce the complexity of the locked-rotor detection function.
Description
Technical Field
The invention relates to the field of automobile power systems, in particular to an automobile motor locked rotor protection method and device and an automobile.
Background
In some cases, the motor may have a locked-rotor condition, and at this time, the power factor of the motor is extremely low, the locked-rotor current is high, and the motor is very easy to burn.
In the prior art, a solution exists in which whether a motor enters a locked-rotor working condition is determined in a timing manner by setting a plurality of timers, wherein each timer corresponds to a different torque interval (the lowest value is arranged from small to large). However, the complexity of the control code of this solution is high, and at the same time, the different timers are independent of each other, resulting in a shorter dwell time of the motor in the higher torque interval (lowest value higher torque interval), only in the lower torque interval (lowest value lower torque interval) being counted and based thereon it is determined whether the motor enters a locked-rotor condition. Therefore, the scheme in the prior art cannot reflect the influence generated by the real torque change, and cannot accurately determine whether the motor enters the locked-rotor working condition.
Disclosure of Invention
Based on the above, it is necessary to provide a method and a device for protecting the locked rotor of an automobile motor and an automobile, so as to improve the detection capability and accuracy of the locked rotor working condition of the motor and reduce the complexity of the locked rotor detection function.
A method for protecting the locked rotor of an automobile motor comprises the following steps:
obtaining the output torque of an automobile motor according to a designated sampling period;
determining a first torque of the motor according to a preset limiting strategy and the output torque;
determining a second torque of the motor based on a motor temperature of the motor and the output torque;
determining a third torque of the motor according to an inverter temperature of the vehicle inverter and the output torque;
selecting the minimum torque among the first torque, the second torque and the third torque as the locked-rotor protection torque;
and setting external characteristic data of the motor according to the locked rotor protection torque.
The automobile motor locked-rotor protection device comprises a controller connected with an automobile motor and an automobile inverter, wherein the controller is used for executing any one of the automobile motor locked-rotor protection methods.
An automobile comprises the automobile motor locked rotor protection device.
According to the method, the device, the computer equipment and the storage medium for protecting the locked rotor of the automobile motor, the output torque of the automobile motor is obtained according to the appointed sampling period, so that the output torque of the motor is monitored in real time. And determining the first torque of the motor according to a preset limiting strategy and the output torque, analyzing the change of the output torque through the preset limiting strategy, determining whether the motor enters a locked-rotor protection state, and further determining the first torque of the motor, wherein the first torque is the first heavy protection of the motor for preventing locked-rotor. And determining a second torque of the motor according to the motor temperature of the motor and the output torque, wherein whether the motor enters a locked-rotor protection state or not is determined through the motor temperature, and further, the second torque of the motor is determined, and the locked-rotor protection is a second protection for preventing the motor from locked-rotor. And determining a third torque of the motor according to the inverter temperature of the automobile inverter and the output torque, wherein whether the motor enters a locked-rotor protection state or not is determined through the inverter temperature, and further, the third torque of the motor is determined, and the third torque is a third protection for preventing the motor from locked-rotor. And selecting the minimum torque among the first torque, the second torque and the third torque as the locked rotor protection torque so as to protect the motor to the greatest extent and prevent the motor from burning out. The external characteristic data of the motor is set according to the locked rotor protection torque, and the external characteristic data of the motor can be timely adjusted according to the locked rotor protection torque, so that the input power of the motor is rapidly reduced and the motor is prevented from being burnt out when the locked rotor working condition occurs. The invention can improve the detection capability and the accuracy of the motor locked-rotor working condition and reduce the complexity of the locked-rotor detection function.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for protecting a motor in an embodiment of the invention;
FIG. 2 is a flow chart of a method for protecting a motor in an embodiment of the invention;
FIG. 3 is a flow chart illustrating a method for protecting a motor in an automobile from stalling according to an embodiment of the invention;
FIG. 4 is a schematic flow chart of a method for protecting a motor in an embodiment of the invention;
FIG. 5 is a schematic flow chart of a method for protecting a motor in an embodiment of the invention;
fig. 6 is a flow chart of a method for protecting a motor in an automobile from locked-rotor according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In an embodiment, as shown in fig. 1, a method for protecting a motor of an automobile from locked rotor is provided, which includes the following steps:
s10, obtaining the output torque of the automobile motor according to a specified sampling period.
Here, the specified sampling period may be set as needed, and may be a sampling period of millisecond order, such as 10ms,5ms, or the like. The automobile motor may refer to a driving motor of a new energy automobile. The output torque may be measured by a torque measuring device on the vehicle. The output torque of the automobile motor is obtained according to the appointed sampling period, and the change of the output torque of the automobile motor can be monitored in real time.
S20, determining the first torque of the motor according to a preset limiting strategy and the output torque.
In this embodiment, the preset limiting policy refers to a policy for judging whether the motor is in a locked-rotor protection state by outputting torque and duration time thereof. The temperature simulation test can be performed on the motor in advance to obtain the allowable stall time and the temperature recovery time of the motor in a plurality of torque intervals (the designated torque intervals can be set according to the needs), so as to obtain the relation data of the output torque and the stall time. The temperature rises during high torque locked-rotor and the temperature drops during low torque locked-rotor. The time corresponding to each torque interval can be processed against the change of the temperature, and the time accumulated value corresponding to each interval can be obtained. Here, the preset limiting policy may be configured to obtain a total time accumulated value by accumulating the total time accumulated values, and determine that the motor is in the locked-rotor protection state when the total time accumulated value exceeds a preset time threshold, and determine that the motor is not in the locked-rotor protection state when the total time accumulated value does not exceed the preset time threshold. The time accumulated value may be positive or negative, but the total time accumulated value is a non-negative number. Because the total accumulated value of time is used for judging whether the motor needs to enter the locked-rotor protection state, only one timer is needed.
After determining the locked-rotor protection state of the motor, a first torque of the motor may be determined in combination with the current output torque. Here, the first torque is a protecting torque for protecting the motor from being burned out. When the motor is in a locked-rotor protection state, the output torque of the motor needs to be reduced. The manner of decreasing may be a linear decrease. At this time, the first torque is a small value. When the motor is not in the locked-rotor protection state, the output torque of the motor does not need to be regulated. At this time, the first torque is a large value.
S30, determining a second torque of the motor according to the motor temperature of the motor and the output torque.
Here, the motor temperature may refer to temperature data measured by a temperature sensor provided on the motor. The motor temperature is higher, exceeds motor temperature threshold value, and then the motor needs to enter the locked-rotor protection state, and the value of the second torque is smaller at this moment. And if the temperature of the motor is lower and does not exceed the temperature threshold value of the motor, the motor is not in a locked-rotor protection state, and the value of the second torque is larger. Step S30 and step S20 are parallel steps.
And S40, determining a third torque of the motor according to the inverter temperature of the automobile inverter and the output torque.
The inverter is a converter for converting direct current electric energy (a battery and an accumulator jar) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current. The temperature of the inverter on the automobile can also reflect whether the motor has a locked-rotor working condition. Specifically, the inverter temperature may refer to temperature data measured by a temperature sensor provided on the inverter. The inverter temperature is higher, and exceeds the inverter temperature threshold value, the inverter is required to enter a locked-rotor protection state, and the value of the third torque is smaller. And if the temperature of the inverter is lower and does not exceed the temperature threshold value of the inverter, the inverter is not in a locked-rotor protection state, and the value of the third torque is larger. Step S40 is parallel to steps S20 and S30.
S50, selecting the minimum torque among the first torque, the second torque and the third torque as the locked-rotor protection torque.
In this embodiment, the first torque, the second torque, and the third torque are guard torques calculated by three different paths, respectively. The minimum torque in the three is selected as the locked rotor protection torque, so that the motor can be protected to the greatest extent, and the motor is prevented from being burnt out.
S60, setting external characteristic data of the motor according to the locked rotor protection torque.
In this embodiment, the external characteristic data of the motor corresponds to the external characteristic data of the engine, and may refer to a speed characteristic of the vehicle energy supply module in an optimal energy supply state. The external characteristic data relates to the output torque and rotational speed of the motor. In one example, the external characteristic data of the motor may be represented as an output torque of the motor. I.e. the output torque of the motor is set to a stall protection torque. Since the locked rotor protection torque is the minimum torque for protecting the motor, in the locked rotor protection state, the output torque of the motor is set to be the locked rotor protection torque, so that the input power of the motor is reduced. At this time, the heating value of the motor is greatly reduced, and the motor can be effectively prevented from being burnt.
In the steps S10-S60, the output torque of the motor of the automobile is obtained according to a specified sampling period so as to monitor the output torque of the motor in real time. And determining the first torque of the motor according to a preset limiting strategy and the output torque, analyzing the change of the output torque through the preset limiting strategy, determining whether the motor enters a locked-rotor protection state, and further determining the first torque of the motor, wherein the first torque is the first heavy protection of the motor for preventing locked-rotor. And determining a second torque of the motor according to the motor temperature of the motor and the output torque, wherein whether the motor enters a locked-rotor protection state or not is determined through the motor temperature, and further, the second torque of the motor is determined, and the locked-rotor protection is a second protection for preventing the motor from locked-rotor. And determining a third torque of the motor according to the inverter temperature of the automobile inverter and the output torque, wherein whether the motor enters a locked-rotor protection state or not is determined through the inverter temperature, and further, the third torque of the motor is determined, and the third torque is a third protection for preventing the motor from locked-rotor. And selecting the minimum torque among the first torque, the second torque and the third torque as the locked rotor protection torque so as to protect the motor to the greatest extent and prevent the motor from burning out. The external characteristic data of the motor is set according to the locked rotor protection torque, and the external characteristic data of the motor can be timely adjusted according to the locked rotor protection torque, so that the input power of the motor is rapidly reduced and the motor is prevented from being burnt out when the locked rotor working condition occurs.
Optionally, as shown in fig. 2, steps S10 and S20, that is, the step of obtaining the output torque of the motor according to the specified sampling period, and determining the first torque of the motor according to the preset limiting strategy and the torque, include:
s201, obtaining output torque and rotation speed of the motor according to a specified sampling period;
s202, when the absolute value of the rotating speed is smaller than a preset rotating speed threshold value and the output torque is not zero, acquiring a time accumulated value matched with the output torque, and updating a time total accumulated value according to the time accumulated value; the time total accumulated value is a historical time total accumulated value corresponding to the end of the last sampling period;
s203, if the total accumulated value of time is greater than a preset time threshold, determining that the motor is in a locked-rotor protection state, and performing first torque limiting processing on the output torque to obtain the first torque, wherein the first torque limiting processing includes: and reducing the output torque of the motor according to a first decreasing slope, recording the output torque in the reducing process as a first torque in real time, and keeping the motor to continuously output the first torque with the preset cutoff torque when the first torque is reduced to the preset cutoff torque, wherein the preset cutoff torque is larger than zero.
In this embodiment, when the absolute value of the rotation speed is smaller than the preset rotation speed threshold value and the output torque of the motor is not zero, the motor can be considered to be hardly rotated, but the motor is still in the energized state, and at this time, the motor is in the locked-rotor working condition. The preset rotational speed threshold may be set at a relatively low rotational speed, such as 10 rpm.
Each output torque has a corresponding time accumulated value. The correspondence between the output torque and the time accumulated value is obtained based on a temperature simulation test in advance. After the output torque is obtained, a time accumulated value that matches the output torque may be found based on a correspondence relationship between the output torque and the time accumulated value.
After determining that the motor has a locked-rotor working condition, determining whether the motor needs to enter a locked-rotor protection state according to the duration time of the locked-rotor working condition. Here, the total accumulated value of time is calculated to determine whether the motor needs to enter the locked-rotor protection state. If the total accumulated value of time is larger than a preset time threshold value, judging that the motor needs to enter a locked-rotor protection state; if the total accumulated value of time is smaller than or equal to a preset time threshold value, the motor is judged not to enter a locked-rotor protection state. Specifically, the total time accumulated value=the corresponding historical total time accumulated value at the end of the last sampling period+the time accumulated value obtained in the current sampling period. In an example, the preset time threshold may be set to 3000 (dimensionless). The total accumulated historical time value may be set to zero during the first sampling period.
When the motor enters a locked-rotor protection state, first torque limiting processing is needed to be carried out on the output torque of the motor. The first torque limiting process may refer to reducing the output torque of the motor with a first decreasing slope, and when the output torque is reduced to a preset cutoff torque, the output torque is not reduced any more. The preset cut-off torque is a protection torque that does not cause the temperature of the motor to rise, and at the same time, the motor still maintains a certain power (i.e., the vehicle can still continue running) under the torque. In an example, the first torque may be represented by a piecewise function, i.e. when the output torque is greater than a preset cutoff torque, specifically: t (T) 1 ＝T 0 -k 1 T, wherein T 1 For a first torque, T 0 For the output torque, k of the motor 1 For a first decreasing slope (positive number), t is the duration after determining that the motor enters a torque protection state; when the output torque drops to the preset cut-off torque, the specific steps are as follows: t (T) 1 ＝T k Wherein T is k Is a preset cutoff torque.
Optionally, in step S202, when the absolute value of the rotation speed is smaller than a preset rotation speed threshold and the output torque is not zero, a time accumulated value matched with the output torque is obtained, and after updating the time total accumulated value according to the time accumulated value, the method further includes:
and if the total accumulated value of time is smaller than or equal to a preset time threshold value, setting the first torque as the maximum output torque of the motor.
And when the total accumulated value of time is smaller than or equal to a preset time threshold value, judging that the motor does not need to enter a locked-rotor protection state. At this time, the first torque may be set to the maximum output torque of the motor, that is, the torque limiting process for the motor is not required.
Optionally, as shown in fig. 3, step S203, after performing the first torque limiting process on the output torque to obtain the first torque, further includes:
s204, updating the time total accumulated value according to the first torque;
and S205, when the updated time total accumulated value is equal to zero, determining that the motor exits from the locked-rotor protection state, and increasing the first torque from the preset cut-off torque according to a first increasing slope.
In this embodiment, if the locked-rotor protection state continues for a period of time, the output torque of the motor may be gradually recovered after the locked-rotor condition continues to improve. The first torque may be increased in a linear increment, i.e. from a preset intercept torque by a first increment slope. In one example, the first torque may be expressed as: t (T) 1 ＝T k +k 1 '.t, where T 1 For a first torque, T k For a preset cut-off torque, k 1 'is a first incremental slope (positive number) and t' is a duration after determining that the motor is out of torque protection state.
Optionally, as shown in fig. 4, step S202, that is, the acquiring a time accumulated value matched with the output torque, updating the time total accumulated value according to the time accumulated value includes:
s2021, determining a preset torque interval to which the output torque belongs, acquiring an accumulated value corresponding to the preset torque interval, and determining a time accumulated value matched with the output torque according to the accumulated value;
s2022, recording the time total accumulated value accumulated by the time accumulated value as an updated time total accumulated value.
In this embodiment, a plurality of preset torque intervals may be divided by the preset torque interval, and each preset torque interval corresponds to an accumulated value. The preset torque interval may be set as required, for example, may be 10n·m. In one example, the correspondence between torque intervals and accumulated values is shown in table 1.
TABLE 1 correspondence between torque intervals and accumulated values
| Torque interval (N.m) | Accumulated value |
| 0-10 (free) | -250 |
| 10-20 (free) | -200 |
| 20-30 (free) | -150 |
| 30-40 (free) | -100 |
| 40-50 (free) | -50 |
| 50-60 (free) | 50 |
| 60-70 (free) | 100 |
| 70-80 (free) | 150 |
| 80-90 (free) | 200 |
| 90-100 | 250 |
If the output torque is 85 N.m, the preset torque interval to which the output torque belongs is [80,90 ], the accumulated value corresponding to the acquired interval [80,90 ] is 200, the designated sampling period is 50ms, and the time accumulated value matched with the output torque is 10 (200×0.05). The total time accumulated value is the sum of a plurality of time accumulated values, namely the sum of the total time accumulated value of the last sampling period and the time accumulated value of the current sampling period, and can be expressed as follows by a formula: t (T) n ＝T n-1 +ΔT n Wherein T is n For the total accumulated value of time of the current sampling period, T n-1 Delta T is the total accumulated value of time of the last sampling period n For the time accumulated value of the current sampling period, n is the current sampling period ordinal number.
Optionally, as shown in fig. 5, step S30, that is, determining the second torque of the motor according to the motor temperature and the output torque of the motor includes:
s301, acquiring the motor temperature of the motor;
s302, judging whether the motor temperature is in a preset motor temperature interval, wherein the minimum value of the preset motor temperature interval is a first motor temperature, and the maximum value of the preset motor temperature interval is a second motor temperature;
s303, when the motor temperature is in a preset motor temperature interval, determining that the motor meets a motor temperature torque limiting condition, and performing second torque limiting processing on the output torque to obtain second torque, wherein the second torque limiting processing comprises: and reducing the output torque according to a second decreasing slope, and recording the output torque in the process of reducing as a second torque in real time.
In this embodiment, whether the motor needs to enter the locked-rotor protection state is determined by detecting the motor temperature. The method comprises the steps of presetting the lowest value of a motor temperature interval, namely the first motor temperature, which is a temperature threshold value for judging that a motor enters a locked-rotor state; and the highest value of the preset motor temperature interval, namely the second motor temperature, is the highest temperature bearable by the motor. When the motor temperature is in the preset motor temperature interval, the output torque of the motor can be reduced by adopting a second decreasing slope. The second decreasing slope may be the slope of the temperature-output torque line. I.e. the output torque decreases linearly with increasing temperature.
Optionally, as shown in fig. 5, after step S302, that is, after the determining whether the motor temperature is within the preset motor temperature interval, the method further includes:
s304, setting the second torque as the maximum output torque of the motor when the motor temperature is less than or equal to the first motor temperature;
and S305, setting the second torque to be zero when the motor temperature is greater than or equal to the second motor temperature.
When the motor temperature is less than or equal to the first motor temperature, the motor does not need to be limited in torque, and the second torque can be set to the maximum output torque of the motor (i.e., 100% of the external characteristic data of the motor). When the temperature of the motor is greater than or equal to the second motor temperature, the motor is indicated to reach or exceed the highest bearable temperature, and the power supply of the motor is required to be stopped at the moment, so that the second torque is zero, and the motor is prevented from continuously heating.
Optionally, as shown in fig. 6, step S40, that is, determining the third torque of the motor according to the inverter temperature of the vehicle inverter and the output torque includes:
s401, acquiring the inverter temperature of an automobile inverter;
s402, judging whether the inverter temperature is in a preset inverter temperature interval, wherein the minimum value of the preset inverter temperature interval is a first inverter temperature, and the maximum value of the preset inverter temperature interval is a second inverter temperature;
s403, if the inverter temperature is in a preset inverter temperature interval, determining that the inverter meets an inverter temperature torque limiting condition, and performing a third torque limiting process on the output torque to obtain a third torque, where the third torque limiting process includes: and reducing the output torque according to a third decreasing slope, and recording the output torque in the process of reducing as a third torque in real time.
In this embodiment, it is determined whether the inverter needs to enter the locked-rotor protection state by detecting the inverter temperature. The method comprises the steps of presetting the lowest value of an inverter temperature interval, namely the first inverter temperature, wherein the lowest value is a temperature threshold value for judging that a motor enters a locked-rotor state; the highest value of the preset inverter temperature interval, namely the second inverter temperature, is the highest temperature bearable by the inverter. When the inverter temperature is within the preset inverter temperature interval, the output torque (third torque) of the inverter may be reduced using a third decreasing slope. The third decreasing slope may be the slope of the temperature-output torque line. I.e. the output torque (third torque) decreases linearly with increasing temperature.
Optionally, as shown in fig. 6, step S402, after determining whether the inverter temperature is within the preset inverter temperature interval, further includes:
s404, setting the third torque as the maximum output torque of the motor when the inverter temperature is less than or equal to the first inverter temperature;
s405, setting the third torque to be zero when the inverter temperature is greater than or equal to the second inverter temperature.
When the inverter temperature is less than or equal to the first inverter temperature, the motor does not need to be limited in torque, and the third torque may be set to the maximum output torque of the motor (i.e., the 100% external characteristic data of the motor). When the temperature of the inverter is greater than or equal to the temperature of the second inverter, the inverter is indicated to reach or exceed the highest bearable temperature, and the power supply of the motor is required to be stopped at the moment, so that the third torque is zero, and the motor is prevented from continuously heating.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The embodiment of the invention also provides an automobile motor locked-rotor protection device, which comprises a controller connected with the automobile motor and the automobile inverter, wherein the controller is used for executing any one of the automobile motor locked-rotor protection methods.
The embodiment of the invention also provides an automobile, which comprises the automobile motor locked rotor protection device.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (11)
1. The method for protecting the locked rotor of the automobile motor is characterized by comprising the following steps of:
obtaining the output torque of an automobile motor according to a designated sampling period;
determining a first torque of the motor according to a preset limiting strategy and the output torque;
determining a second torque of the motor based on a motor temperature of the motor and the output torque;
determining a third torque of the motor according to an inverter temperature of the vehicle inverter and the output torque;
selecting the minimum torque among the first torque, the second torque and the third torque as the locked-rotor protection torque;
and setting external characteristic data of the motor according to the locked rotor protection torque.
2. The method for protecting a locked rotor of an automotive motor according to claim 1, wherein the step of obtaining an output torque of the automotive motor at a specified sampling period, and determining a first torque of the motor according to a preset limiting strategy and the torque, comprises:
obtaining the output torque and the rotating speed of the motor according to a designated sampling period;
when the absolute value of the rotating speed is smaller than a preset rotating speed threshold value and the output torque is not zero, acquiring a time accumulated value matched with the output torque, and updating a time total accumulated value according to the time accumulated value; the time total accumulated value is a historical time total accumulated value corresponding to the end of the last sampling period;
if the total accumulated time value is greater than a preset time threshold value, determining that the motor is in a locked-rotor protection state, and performing first torque limiting processing on the output torque to obtain the first torque, wherein the first torque limiting processing comprises: and reducing the output torque of the motor according to a first decreasing slope, recording the output torque in the reducing process as a first torque in real time, and keeping the motor to continuously output the first torque with the preset cutoff torque when the first torque is reduced to the preset cutoff torque, wherein the preset cutoff torque is larger than zero.
3. The method for protecting a locked rotor of an automotive motor according to claim 2, wherein when the absolute value of the rotational speed is smaller than a preset rotational speed threshold and the output torque is not zero, obtaining a time accumulated value matched with the output torque, and updating the time total accumulated value according to the time accumulated value, further comprises:
and if the total accumulated value of time is smaller than or equal to a preset time threshold value, setting the first torque as the maximum output torque of the motor.
4. The method for protecting a locked rotor of an automotive motor according to claim 2, wherein after said first torque limiting process is performed on said output torque to obtain said first torque, further comprising:
updating the time total accumulated value according to the first torque;
and when the updated time total accumulated value is equal to zero, determining that the motor exits from the locked-rotor protection state, and increasing the first torque from the preset cut-off torque according to a first increasing slope.
5. The method of claim 2, wherein the obtaining a time accumulated value matched to the output torque, and updating the time total accumulated value based on the time accumulated value comprises:
determining a preset torque interval to which the output torque belongs, acquiring an accumulated value corresponding to the preset torque interval, and determining a time accumulated value matched with the output torque according to the accumulated value;
the time total accumulated value accumulated with the time accumulated value is recorded as an updated time total accumulated value.
6. The method of claim 1, wherein said determining a second torque of said motor based on a motor temperature of said motor and said output torque comprises:
acquiring the motor temperature of the motor;
judging whether the motor temperature is in a preset motor temperature interval or not, wherein the minimum value of the preset motor temperature interval is the first motor temperature, and the maximum value of the preset motor temperature interval is the second motor temperature;
when the motor temperature is in a preset motor temperature interval, determining that the motor meets motor temperature torque limiting conditions, and performing second torque limiting processing on the output torque to obtain second torque, wherein the second torque limiting processing comprises: and reducing the output torque according to a second decreasing slope, and recording the output torque in the process of reducing as a second torque in real time.
7. The method for protecting a motor in an automobile from locked rotor as claimed in claim 6, wherein said determining whether said motor temperature is within a preset motor temperature interval further comprises:
setting the second torque as the maximum output torque of the motor when the motor temperature is less than or equal to the first motor temperature;
and setting the second torque to be zero when the motor temperature is greater than or equal to the second motor temperature.
8. The method of claim 1, wherein said determining a third torque of said motor based on an inverter temperature of an automotive inverter and said output torque comprises:
acquiring the inverter temperature of an automobile inverter;
judging whether the inverter temperature is in a preset inverter temperature interval, wherein the minimum value of the preset inverter temperature interval is the first inverter temperature, and the maximum value of the preset inverter temperature interval is the second inverter temperature;
if the inverter temperature is in the preset inverter temperature interval, determining that the inverter meets an inverter temperature torque limiting condition, and performing third torque limiting processing on the output torque to obtain third torque, wherein the third torque limiting processing comprises: and reducing the output torque according to a third decreasing slope, and recording the output torque in the process of reducing as a third torque in real time.
9. The method for protecting a locked rotor of an automotive motor according to claim 8, wherein said determining whether said inverter temperature is within a preset inverter temperature interval further comprises:
setting the third torque as a maximum output torque of the motor when the inverter temperature is less than or equal to the first inverter temperature;
and setting the third torque to be zero when the inverter temperature is greater than or equal to the second inverter temperature.
10. A motor lock protection device for a motor vehicle, comprising a controller connecting the motor vehicle and an inverter of the motor vehicle, the controller being configured to execute the motor vehicle lock protection method according to any one of claims 1 to 9.
11. An automobile comprising the automotive motor lock protection device of claim 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011065221.9A CN114312317B (en) | 2020-09-30 | 2020-09-30 | Automobile motor locked rotor protection method and device and automobile |
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| CN202011065221.9A CN114312317B (en) | 2020-09-30 | 2020-09-30 | Automobile motor locked rotor protection method and device and automobile |
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| CN114312317B true CN114312317B (en) | 2023-11-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102390285A (en) * | 2011-08-19 | 2012-03-28 | 奇瑞汽车股份有限公司 | Electrically-driven system locked-rotor protecting and torque-limiting method |
| CN102700417A (en) * | 2012-05-22 | 2012-10-03 | 奇瑞汽车股份有限公司 | Locked-rotor protection method for driving motor of electric vehicle |
| CN204597830U (en) * | 2015-04-30 | 2015-08-26 | 比亚迪股份有限公司 | Motor control assembly |
| CN107117076A (en) * | 2017-05-23 | 2017-09-01 | 合肥巨动力系统有限公司 | A kind of drive system of electric automobile rotation-clogging protection method based on threshold value |
| JP2019110672A (en) * | 2017-12-18 | 2019-07-04 | Ntn株式会社 | Driving control device of motor-mounted automobile |
-
2020
- 2020-09-30 CN CN202011065221.9A patent/CN114312317B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102390285A (en) * | 2011-08-19 | 2012-03-28 | 奇瑞汽车股份有限公司 | Electrically-driven system locked-rotor protecting and torque-limiting method |
| CN102700417A (en) * | 2012-05-22 | 2012-10-03 | 奇瑞汽车股份有限公司 | Locked-rotor protection method for driving motor of electric vehicle |
| CN204597830U (en) * | 2015-04-30 | 2015-08-26 | 比亚迪股份有限公司 | Motor control assembly |
| CN107117076A (en) * | 2017-05-23 | 2017-09-01 | 合肥巨动力系统有限公司 | A kind of drive system of electric automobile rotation-clogging protection method based on threshold value |
| JP2019110672A (en) * | 2017-12-18 | 2019-07-04 | Ntn株式会社 | Driving control device of motor-mounted automobile |
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| CN114312317A (en) | 2022-04-12 |
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