CN113031673B - Temperature control method for pure electric vehicle driving system - Google Patents
Temperature control method for pure electric vehicle driving system Download PDFInfo
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- CN113031673B CN113031673B CN202110119618.XA CN202110119618A CN113031673B CN 113031673 B CN113031673 B CN 113031673B CN 202110119618 A CN202110119618 A CN 202110119618A CN 113031673 B CN113031673 B CN 113031673B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001133 acceleration Effects 0.000 claims abstract description 16
- 238000012795 verification Methods 0.000 claims abstract description 6
- 230000001960 triggered effect Effects 0.000 claims description 6
- 241000270666 Testudines Species 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 230000009194 climbing Effects 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 7
- 241000270708 Testudinidae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
- B60K2001/006—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric motors
Abstract
The invention provides a temperature control method for a pure electric vehicle driving system, which comprises the following steps: the method comprises the following steps of carrying out first working condition test, second working condition test, numerical value recording, logic setting, logic application and logic verification; the invention obtains the motor temperature threshold value and the maximum torque value of the motor through multiple working condition tests, obtains the output torque value of the motor linearly reduced under the optimization of the motor temperature through calculation, limits the specified temperature for starting to reduce the output torque value of the motor and the value for reducing the torque value, constructs software control logic, and records the software control logic into the controller, and verifies the logic reasonableness and reduces the failure rate of the whole vehicle through the test circulation of vehicle speed rapid acceleration and rapid deceleration.
Description
Technical Field
The invention relates to the technical field of automobile temperature control, in particular to a temperature control method for a pure electric vehicle driving system.
Background
With the popularization of new energy vehicles, the environment using the pure electric vehicle is changed, the capacity of the battery for controlling the external temperature is improved, the external environment adapted to the pure electric vehicle is wider and wider, and the pressure born by the pure electric vehicle is closer to that of the traditional vehicle;
the basic part of the pure electric vehicle is a three-electric system which comprises a motor, a motor controller, a battery management system, a vehicle controller, a vehicle-mounted charger and a high-low voltage direct current converter, wherein the vehicle is driven to run by the output power of a driving motor during running of the vehicle, the temperature of the driving system rises along with the output power of the driving motor, and when the output power of the driving motor rises to a certain threshold value, the motor triggers a secondary fault and an instrument lights a tortoise lamp and a motor over-temperature fault lamp, so that the power performance of the whole vehicle is reduced, and the perception of a client is poor.
Disclosure of Invention
Aiming at the problems, the invention provides a temperature control method of a pure electric vehicle driving system, which obtains a motor temperature threshold and a maximum torque value of a motor through multiple working condition tests, obtains an output torque value of the motor linearly reduced under the optimization of the motor temperature through calculation, limits a specified temperature for starting to reduce the output torque value of the motor and a numerical value for reducing the torque value, constructs a software control logic, is burnt into a controller, and verifies the logic rationality and reduces the failure rate of the whole vehicle through the test circulation of vehicle speed rapid acceleration and rapid deceleration.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a temperature control method for a pure electric vehicle driving system comprises the following steps:
the method comprises the following steps: first test of operating conditions
The test was carried out under condition 1: selecting a road of a ramp, climbing a vehicle with a full throttle for 1km after the vehicle speed is stabilized, observing the temperature of a motor, reaching the temperature of a fault point after the temperature of the motor is higher than a threshold value, and recording the temperature threshold value of the motor;
step two: second test of operating conditions
The test was carried out under condition 2: the method comprises the following steps that a vehicle runs on a flat road, rapid acceleration and rapid reduction are frequently carried out for 0-50km/h and 50-0km/h, fifty cycles of running are carried out, when the temperature of a motor is higher than a threshold value, an over-temperature secondary fault of the motor is triggered, an instrument lights an over-temperature fault lamp of the motor and a power-limiting turtle lamp, and the temperature threshold value of the motor is recorded;
step three: record the value
Comparing the motor temperature thresholds recorded in the working condition 1 and the working condition 2, taking an average number to obtain a motor temperature threshold a, recording the peak torque of the motor in the working condition 1 and the working condition 2, and recording the rated torque of the motor;
step four: setting logic
Setting the value optimized to the motor temperature as b, and then calculating the difference value c between the peak torque and the rated torque of the motor by using a-b as a temperature node when the motor torque is optimized, so that when the motor temperature reaches a-b, the output torque value of linear reduction of the motor at the temperature of one b times is calculated;
step five: logic application
Obtaining a motor temperature threshold value of 140 ℃, a motor peak torque of 110Nm and a motor rated torque of 40Nm through the records, calculating to obtain a temperature when the temperature is 130 ℃ for optimizing the motor torque by taking an integer of 10, namely taking the temperature 10 ℃ in advance as an equant number, namely reducing the motor output torque value from 130 ℃, and calculating to obtain a reduced torque value of 7 Nm/DEG C so as to construct a software control logic;
step six: logic verification
And E, burning the software control logic obtained in the step V into a controller of the motor, wherein the test working condition is 0-50km/h of rapid acceleration, then the rapid acceleration is carried out to 5km/h, then the rapid acceleration is carried out to 50km/h, fifty cycles are driven, the power CAN data of the automobile are collected, the temperature of the motor is 134 ℃ after fifty cycles are checked, and the temperature does not reach the temperature threshold.
The further improvement lies in that: in the first step, a ramp with an inclination angle of 12 degrees is selected for the vehicle to climb on the full accelerator.
The further improvement lies in that: in the second step, the instrument lights the motor over-temperature fault lamp and the power-limiting turtle lamp, and after the phenomenon occurs, the temperature of the motor is not controlled, the temperature balance point cannot be reached, and the whole vehicle has a fault mode.
The further improvement lies in that: and in the third step, the peak torque of the motor is the maximum torque value of the motor in the working condition 1 and the working condition 2.
The further improvement lies in that: in the fourth step, the calculation process is as follows: and b is taken as an equal ratio denominator, c is taken as a numerator, and c/b is taken to obtain the output torque value of the linear decline of the motor at the temperature of one-fourth of b.
The further improvement lies in that: in the fifth step, a temperature calculation formula when the motor torque is optimized is as follows: 140 ℃ -10 ℃ and 130 ℃ and in step five, the reduced torque value is calculated by the formula: (110 Nm-40 Nm)/10 ℃ =7 Nm/. degree.C.
The further improvement lies in that: in the fifth step, the reduced torque value is calculated to be 7 Nm/deg.c, and the torque value is not limited by the motor rotation speed condition.
The further improvement lies in that: in the sixth step, the temperature of the motor is below 134 ℃, the motor reaches a balance point, and the motor over-temperature fault is not triggered in the whole process.
The invention has the beneficial effects that: the invention obtains the motor temperature threshold value and the maximum torque value of the motor through multiple working condition tests, obtains the output torque value of the motor linearly reduced under the optimization of the motor temperature through calculation, limits the specified temperature for starting to reduce the output torque value of the motor and the value for reducing the torque value, constructs software control logic, and records the software control logic into the controller, and verifies the logic reasonableness and reduces the failure rate of the whole vehicle through the test circulation of vehicle speed rapid acceleration and rapid deceleration.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph of the uncontrolled temperature of the motor of the present invention;
fig. 3 is a test chart of motor temperature controlled data of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
According to the embodiments shown in fig. 1, 2 and 3, the present embodiment provides a method for controlling the temperature of a drive system of a pure electric vehicle, including the following steps:
the method comprises the following steps: first test of operating conditions
The test was carried out under condition 1: selecting a ramp road with an inclination angle of 12 degrees, climbing the vehicle with a full throttle for 1km after the vehicle speed is stabilized, observing the temperature of the motor, reaching the temperature of a fault point after the temperature of the motor is higher than a threshold value, and recording the temperature threshold value of the motor;
step two: second test of operating conditions
The test was carried out under condition 2: the method comprises the following steps that a vehicle runs on a flat road, rapid acceleration is frequently carried out for 0-50km/h and 50-0km/h, fifty cycles of running are carried out, when the temperature of a motor is higher than a threshold value, an overtemperature secondary fault of the motor is triggered, an instrument lights an overtemperature fault lamp of the motor and a power-limiting turtle lamp, and after the phenomenon occurs, the temperature of the motor is not controlled, the temperature balance point cannot be reached, a fault mode occurs in the whole vehicle, and the temperature threshold value of the motor is recorded;
step three: record the value
Comparing the motor temperature thresholds recorded in the working conditions 1 and 2, taking an average number to obtain a motor temperature threshold a, simultaneously recording peak torques of the motor in the working conditions 1 and 2, taking the maximum torque values of the motor in the working conditions 1 and 2 as the peak torques, and simultaneously recording the rated torque of the motor;
step four: setting logic
Setting a value optimized for the motor temperature as b, and then a-b is a temperature node when the motor torque is optimized, and calculating a difference value c between the peak torque and the rated torque of the motor, so that when the motor temperature reaches a-b, b is used as an equal ratio denominator, c is used as a numerator, and c/b is used for obtaining an output torque value of linear reduction of the motor at the temperature of every b times;
step five: logic application
Through the above records, the temperature threshold of the motor is 140 ℃, the peak torque of the motor is 110Nm, the rated torque of the motor is 40Nm, b is an integer of 10, namely 10 ℃ in advance is taken as an equant, the temperature when the temperature is 130 ℃ for optimizing the torque of the motor is obtained through calculation, and the calculation formula is as follows: 140 ℃ -10 ℃=130 ℃, namely, the motor output torque value is reduced from 130 ℃, the reduced torque value is calculated to be 7 Nm/DEG C, and the calculation formula is as follows: (110 Nm-40 Nm)/10 ℃ =7 Nm/DEG C, and the torque value is not limited by the motor rotating speed condition, so as to construct a software control logic;
step six: logic verification
And E, burning the software control logic obtained in the step V into a controller of the motor, wherein the test working condition is 0-50km/h of rapid acceleration, then the rapid acceleration is carried out to 5km/h, then the rapid acceleration is carried out to 50km/h, fifty cycles of driving are carried out, power CAN data of the automobile are collected, the temperature of the motor is 134 ℃ after fifty cycles of checking, the balance point is reached, the temperature threshold value is not reached, and the motor over-temperature fault is not triggered in the whole process.
Verification example: fig. 2 is a test of the temperature of the motor which cannot be controlled, and fig. 3 is a test of the temperature controlled data of the motor after the invention is applied.
According to the temperature control method of the pure electric vehicle driving system, a motor temperature threshold value and a maximum torque value of a motor are obtained through multiple working condition tests, an output torque value of the motor which linearly decreases under the condition of motor temperature optimization is obtained through calculation, so that the specified temperature for starting to decrease the output torque value of the motor and the value of the decreased torque value are limited, a software control logic is constructed and is burnt into a controller, and through a vehicle speed rapid acceleration and rapid deceleration test cycle, the rationality of the logic and the failure rate of the whole vehicle are verified, and through verification, the temperature control method can stably control the motor temperature and reduce the failure rate.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A temperature control method for a pure electric vehicle driving system is characterized by comprising the following steps:
the method comprises the following steps: first test of operating conditions
The test was carried out under condition 1: selecting a road of a ramp, climbing a vehicle with a full throttle for 1km after the vehicle speed is stabilized, observing the temperature of a motor, reaching the temperature of a fault point after the temperature of the motor is higher than a threshold value, and recording the temperature threshold value of the motor;
step two: second test of operating conditions
The test was carried out under condition 2: the method comprises the following steps that a vehicle runs on a flat road, rapid acceleration and rapid reduction are frequently carried out for 0-50km/h and 50-0km/h, fifty cycles of running are carried out, when the temperature of a motor is higher than a threshold value, an over-temperature secondary fault of the motor is triggered, an instrument lights an over-temperature fault lamp of the motor and a power-limiting turtle lamp, and the temperature threshold value of the motor is recorded;
step three: record the value
Comparing the motor temperature thresholds recorded in the working conditions 1 and 2, taking an average number to obtain a motor temperature threshold a, simultaneously recording the peak torque of the motor in the working conditions 1 and 2, taking the maximum torque values of the motor in the working conditions 1 and 2 as the peak torque of the motor, and simultaneously recording the rated torque of the motor;
step four: setting logic
Setting the value optimized to the motor temperature as b, and then calculating the difference value c between the peak torque and the rated torque of the motor by using a-b as a temperature node when the motor torque is optimized, thus when the motor temperature reaches a-b, calculating to obtain the output torque value of the linear decline of the motor at every b times of the temperature, wherein the calculation process is as follows: b is taken as an equal ratio denominator, c is taken as a numerator, and c/b is taken to obtain the output torque value of the linear decline of the motor at the temperature of one-fourth of b;
step five: logic application
Obtaining a motor temperature threshold value of 140 ℃, a motor peak torque of 110Nm and a motor rated torque of 40Nm through the records, calculating to obtain a temperature when the temperature is 130 ℃ for optimizing the motor torque by taking an integer of 10, namely taking the temperature 10 ℃ in advance as an equant number, namely reducing the motor output torque value from 130 ℃, and calculating to obtain a reduced torque value of 7 Nm/DEG C so as to construct a software control logic;
step six: logic verification
And E, burning the software control logic obtained in the step V into a controller of the motor, wherein the test working condition is 0-50km/h of rapid acceleration, then the rapid acceleration is carried out to 5km/h, then the rapid acceleration is carried out to 50km/h, fifty cycles are driven, the power CAN data of the automobile are collected, the temperature of the motor is 134 ℃ after fifty cycles are checked, and the temperature does not reach the temperature threshold.
2. The temperature control method for the drive system of the pure electric vehicle according to claim 1, characterized in that: in the first step, a ramp with an inclination angle of 12 degrees is selected for the vehicle to climb on the full accelerator.
3. The temperature control method for the drive system of the pure electric vehicle according to claim 1, characterized in that: in the second step, the instrument lights the motor over-temperature fault lamp and the power-limiting turtle lamp, and after the phenomenon occurs, the temperature of the motor is not controlled, the temperature balance point cannot be reached, and the whole vehicle has a fault mode.
4. The temperature control method for the drive system of the pure electric vehicle according to claim 1, characterized in that: in the fifth step, a temperature calculation formula when the motor torque is optimized is as follows: 140 ℃ -10 ℃ and 130 ℃ and in step five, the reduced torque value is calculated by the formula: (110 Nm-40 Nm)/10 ℃ =7 Nm/. degree.C.
5. The temperature control method for the drive system of the pure electric vehicle according to claim 1, characterized in that: in the fifth step, the reduced torque value is calculated to be 7 Nm/deg.c, and the torque value is not limited by the motor rotation speed condition.
6. The temperature control method for the drive system of the pure electric vehicle according to claim 1, characterized in that: in the sixth step, the temperature of the motor is below 134 ℃, the motor reaches a balance point, and the motor over-temperature fault is not triggered in the whole process.
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Address after: 314500 988 Tong Tong Road, Wu Tong Street, Tongxiang, Jiaxing, Zhejiang Patentee after: United New Energy Automobile Co.,Ltd. Address before: 314500 988 Tong Tong Road, Wu Tong Street, Tongxiang, Jiaxing, Zhejiang Patentee before: Hezhong New Energy Vehicle Co.,Ltd. Address after: 314500 988 Tong Tong Road, Wu Tong Street, Tongxiang, Jiaxing, Zhejiang Patentee after: Hezhong New Energy Vehicle Co.,Ltd. Address before: 314500 988 Tong Tong Road, Wu Tong Street, Tongxiang, Jiaxing, Zhejiang Patentee before: HOZON NEW ENERGY AUTOMOBILE Co.,Ltd. |
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Effective date of registration: 20231215 Address after: 231400 No. 1, Zone B, Shuangchuang Industrial Park, Tongcheng Economic and Technological Development Zone, Anqing City, Anhui Province Patentee after: Haozhi Technology Electric Drive (Tongcheng) Co.,Ltd. Address before: 314500 988 Tong Tong Road, Wu Tong Street, Tongxiang, Jiaxing, Zhejiang Patentee before: United New Energy Automobile Co.,Ltd. |
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