WO2024037030A1 - 一种抑制电池自加热过程中车辆震动的方法、装置及汽车 - Google Patents
一种抑制电池自加热过程中车辆震动的方法、装置及汽车 Download PDFInfo
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- WO2024037030A1 WO2024037030A1 PCT/CN2023/090520 CN2023090520W WO2024037030A1 WO 2024037030 A1 WO2024037030 A1 WO 2024037030A1 CN 2023090520 W CN2023090520 W CN 2023090520W WO 2024037030 A1 WO2024037030 A1 WO 2024037030A1
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 494
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- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 16
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- 238000004804 winding Methods 0.000 description 6
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- 230000036760 body temperature Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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Classifications
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
-
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
Definitions
- the present disclosure relates to the field of battery technology, and in particular to a method, device and automobile for suppressing vehicle vibration during battery self-heating.
- batteries can be used as power sources in the vehicle field.
- the performance of the battery will also be affected.
- the battery pack In a low-temperature environment, when an electric vehicle is driven, the battery pack is affected by the low-temperature environment. The activity of the active substances inside the battery pack is significantly reduced, and the internal resistance of the battery will also increase as the temperature decreases. Therefore, in a low-temperature environment , the cruising range of electric vehicles will decrease significantly.
- the battery pack needs to be heated to increase its body temperature.
- part of the motors can be used for driving and the other part of the motors can be used for self-heating of the battery.
- This can achieve self-heating of the battery during driving.
- the inventor found that this self-heating method will This causes the motor used for self-heating to vibrate, which in turn causes the entire vehicle to vibrate, and the vibration is strong, which not only brings a bad driving experience to passengers, but also damages the service life of the motor.
- the direct cause of motor jitter has not yet been found, let alone how to solve the problem.
- the present disclosure is proposed to provide a method, device and automobile for suppressing vehicle vibration during battery self-heating that overcome the above problems or at least partially solve the above problems.
- embodiments of the present disclosure provide a method for suppressing vehicle vibration during battery self-heating.
- the method is applied to a vehicle including a power battery pack, a first motor and a second motor.
- the method includes:
- Control the power battery pack to output driving current to the first motor to drive the first motor to rotate, and when the first motor rotates, it drags the second motor to rotate;
- Control the power battery pack to output a self-heating current to the second motor to perform self-heating of the power battery
- the fundamental frequency of the self-heating current is controlled according to the real-time rotation speed, so that the fundamental frequency and the real-time rotation speed form a peak shift.
- controlling the fundamental frequency of self-heating according to the real-time rotational speed so that the fundamental frequency and the real-time rotational speed form a peak shift includes:
- the basic frequency is controlled to be at the second frequency; wherein any rotation speed in the second rotation speed interval is higher than any rotation speed in the first rotation speed interval, and the third rotation speed is higher than any rotation speed in the first rotation speed interval.
- the second frequency is less than the first frequency.
- controlling the fundamental frequency of self-heating according to the real-time rotational speed so that the fundamental frequency and the real-time rotational speed form a staggered peak include:
- the fundamental frequency is controlled according to the real-time rotational speed and real-time working conditions, so that the fundamental frequency and the real-time rotational speed form a peak shift, and the real-time working conditions include: acceleration working conditions or deceleration working conditions.
- the fundamental wave frequency is controlled according to the real-time rotation speed and real-time operating conditions, so that the fundamental wave frequency is consistent with the real-time operating conditions.
- the rotational speed forms staggered peaks, including:
- the self-heating current value and the fundamental wave frequency are controlled .
- the plurality of preset rotation speeds include: a first preset rotation speed, a second preset rotation speed;
- Wave frequencies including:
- the self-heating current value is controlled to be the first current value, and Control the fundamental wave frequency to be the first frequency;
- the self-heating current value is controlled to be a third value. a current value, and controlling the fundamental wave frequency to be the first frequency;
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the base current value is controlled.
- the wave frequency drops from the first frequency to the second frequency, and the second current value is close to 0 or equal to 0.
- the method further includes:
- the self-heating current value is kept as the second current value, and the fundamental frequency is kept as the second frequency until the stable signal is received,
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental wave frequency is maintained at the second frequency.
- the plurality of preset rotation speeds include: a first preset rotation speed, a second preset rotation speed;
- the fundamental frequency includes:
- the self-heating current value is controlled to be the first current value, and all the current values are controlled.
- the fundamental frequency is the second frequency
- the self-heating current value is controlled from the first current
- the value drops to the second current value, and the fundamental wave frequency is controlled to rise from the second frequency to the first frequency, and the second current value is close to 0 or equal to 0;
- the method further includes:
- the self-heating current value is kept as the second current value, and the fundamental frequency is kept as the first frequency until the stable signal is received,
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental wave frequency is maintained at the first frequency.
- the values of the first preset rotation speed and the second preset rotation speed are determined by the first frequency, the second frequency and the number of pole pairs of the motor.
- the first motor is a synchronous motor or an asynchronous motor
- the second motor is an asynchronous motor
- embodiments of the present disclosure also provide another method for suppressing vehicle vibration during battery self-heating.
- the method is applied to a vehicle including a power battery pack, a first motor and a second motor.
- the method includes:
- Control the power battery pack to output driving current to the first motor to drive the first motor to rotate, and when the first motor rotates, it drags the second motor to rotate;
- Control the power battery pack to output a self-heating current to the second motor to perform self-heating of the power battery
- the self-heating current fundamental wave frequency is controlled so that the self-heating current fundamental wave frequency and the driving current fundamental wave frequency form a staggered peak.
- controlling the fundamental frequency of the self-heating current according to the fundamental frequency of the driving current so that the fundamental frequency of the self-heating current and the fundamental frequency of the driving current form a staggered peak include:
- the fundamental frequency of the driving current is located in the second frequency interval
- the fundamental frequency of the self-heating current is controlled to be located at the second frequency; wherein any frequency in the second frequency interval is higher than that in the first frequency interval. At any frequency, the second frequency is smaller than the first frequency.
- controlling the fundamental frequency of the self-heating current according to the fundamental frequency of the driving current so that the fundamental frequency of the self-heating current and the fundamental frequency of the driving current form a staggered peak include:
- the fundamental frequency of the self-heating current is controlled according to the fundamental frequency of the driving current and the real-time operating conditions, so that the fundamental frequency of the self-heating current and the fundamental frequency of the driving current form a staggered peak.
- the real-time operating conditions include: Acceleration or deceleration conditions.
- the fundamental frequency of the self-heating current is controlled according to the fundamental frequency of the driving current and real-time working conditions, so that the fundamental frequency of the self-heating current and the fundamental frequency of the driving current form a staggered peak.
- the magnitude relationship between the expected frequency and multiple preset frequencies and the magnitude relationship between the driving current fundamental frequency and the multiple preset frequencies, combined with the real-time working conditions, the self-heating current value and the Self-heating current fundamental frequency.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the self-heating current value and The fundamental frequency of the self-heating current includes:
- the self-heating current value is controlled to be the first current. value, and control the fundamental wave frequency of the self-heating current to be the first frequency;
- the self-heating current is controlled during the process in which the fundamental frequency of the driving current increases below the first preset frequency under acceleration conditions.
- the value is the first current value, and the fundamental wave frequency of the self-heating current is controlled to be the first frequency;
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the self-heating current value is controlled to decrease from the first current value to the second current value.
- the fundamental frequency of the self-heating current drops from the first frequency to the second frequency, and the second current value is close to 0 or equal to 0;
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the self-heating current value is kept as the second current value, and the fundamental wave frequency of the self-heating current is kept as the second frequency until the stable signal is received.
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the self-heating current value and The fundamental frequency of the self-heating current includes:
- the self-heating current value is controlled to be the first current value, And control the fundamental wave frequency of the self-heating current to the second frequency;
- the fundamental frequency of the driving current is lower than the second preset frequency under deceleration conditions.
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the fundamental wave frequency of the self-heating current is controlled to increase from the second frequency to the first frequency.
- the second current value is close to 0 or equal to 0;
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- the self-heating current value When the stable signal is not received, the self-heating current value is kept as the second current value, and the fundamental frequency of the self-heating current is kept as the first frequency until the stable signal is received. After receiving the signal, the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- inventions of the present disclosure provide a device for suppressing vehicle vibration during battery self-heating.
- the device is applied to a vehicle including a power battery pack, a first motor and a second motor.
- the device includes:
- a rotation control module used to control the power battery pack to output driving current to the first motor to drive the first motor to rotate, and when the first motor rotates, it drags the second motor to rotate;
- Control a self-heating module for controlling the power battery pack to output a self-heating current to the second motor to perform self-heating of the power battery
- the acquisition module is used to acquire the real-time rotation speed of the first motor
- a frequency control module is used to control the fundamental frequency of the self-heating according to the real-time rotation speed, so that the fundamental frequency and the real-time rotation speed form a peak shift.
- control frequency module includes:
- a first control unit configured to control the fundamental frequency to be at the first frequency when the real-time rotational speed is within the first rotational speed interval
- a second control unit configured to control the basic frequency to be at a second frequency when the real-time rotational speed is in the second rotational speed interval; wherein any rotational speed in the second rotational speed interval is higher than that in the first rotational speed interval. At any rotation speed, the second frequency is smaller than the first frequency.
- control frequency module includes:
- a working condition control frequency unit is used to control the fundamental frequency according to the real-time speed and real-time working conditions, so that the fundamental frequency and the real-time speed form a peak shift.
- the real-time working conditions include: acceleration working conditions or Deceleration conditions.
- the operating condition control frequency unit includes:
- the expected rotational speed subunit is used to determine the expected rotational speed based on the degree of depression of the accelerator pedal under the acceleration condition or the depression of the deceleration pedal under the deceleration condition.
- the expected rotational speed represents the motor corresponding to the vehicle speed that the driver expects to reach. Rotating speed;
- a working condition control subunit configured to control self-heating based on the relationship between the expected rotating speed and multiple preset rotating speeds, and the relationship between the real-time rotating speed and the multiple preset rotating speeds, combined with the real-time working conditions. current value and the fundamental frequency.
- the plurality of preset rotation speeds include: a first preset rotation speed, a second preset rotation speed;
- the working condition control subunit has functions for:
- the self-heating current value is controlled to be the first current value, and Control the fundamental wave frequency to be the first frequency;
- the self-heating current value is controlled to be a third value. a current value, and controlling the fundamental wave frequency to be the first frequency;
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the base current value is controlled.
- the wave frequency drops from the first frequency to the second frequency, and the second current value is close to 0 or equal to 0.
- the working condition control subunit is also specifically used to:
- the self-heating current value is maintained at the second current value and the fundamental frequency is maintained. is the second frequency, until the stable signal is received, the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency is maintained at the third frequency. Second frequency.
- the plurality of preset rotation speeds include: a first preset rotation speed, a second preset rotation speed;
- the working condition control subunit is also specifically used for:
- the self-heating current value is controlled to be the first current value, and all the current values are controlled.
- the fundamental frequency is the second frequency
- the self-heating current value is controlled from the first current
- the value drops to the second current value, and the fundamental wave frequency is controlled to rise from the second frequency to the first frequency, and the second current value is close to 0 or equal to 0;
- the working condition control subunit is also specifically used to:
- the self-heating current value is kept as the second current value, and the fundamental frequency is kept as the first frequency until the stable signal is received,
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental wave frequency is maintained at the first frequency.
- embodiments of the present disclosure also provide another device for suppressing vehicle vibration during battery self-heating.
- the device is applied to a vehicle including a power battery pack, a first motor and a second motor.
- the device includes:
- a rotational drag module is used to control the power battery pack to output driving current to the first motor to drive the first motor to rotate, and when the first motor rotates, it drags the second motor to rotate;
- a current self-heating module used to control the power battery pack to output a self-heating current to the second motor to perform self-heating of the power battery
- the self-heating fundamental wave frequency control module is used to control the self-heating current fundamental wave frequency according to the driving current fundamental wave frequency, so that the self-heating current fundamental wave frequency and the driving current fundamental wave frequency form a staggered peak.
- the module for controlling self-heating fundamental wave frequency includes:
- a first unit configured to control the fundamental frequency of the self-heating current to be at the first frequency when the fundamental frequency of the driving current is in the first frequency interval;
- the second unit is used to control the basic frequency of the self-heating current to be at the second frequency when the fundamental frequency of the driving current is in the second frequency interval; wherein any frequency in the second frequency interval is higher than the Any frequency within the first frequency interval, the second frequency is smaller than the first frequency.
- the module for controlling self-heating fundamental wave frequency includes:
- a frequency peak-shifting control unit is used to control the self-heating current fundamental wave frequency according to the driving current fundamental wave frequency and real-time working conditions, so that the self-heating current fundamental wave frequency and the driving current fundamental wave frequency form a peak-shifting frequency.
- the real-time working conditions include: acceleration working conditions or deceleration working conditions.
- the frequency peak shifting control unit includes:
- the expected speed under working conditions subunit is used to determine the expected speed according to the degree of stepping on the accelerator pedal under the acceleration working condition or the stepping degree of the deceleration pedal under the deceleration working condition.
- the expected speed represents the vehicle speed that the driver expects to reach. motor speed;
- the frequency peak shifting control subunit is used to combine the real-time working conditions according to the relationship between the expected frequency and multiple preset frequencies, and the relationship between the driving current fundamental wave frequency and the multiple preset frequencies. , control the self-heating current value and the fundamental wave frequency of the self-heating current.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the frequency peak shifting control subunit is specifically used for:
- the self-heating current value is controlled to be the first current. value, and control the fundamental wave frequency of the self-heating current to be the first frequency;
- the self-heating current is controlled during the process in which the fundamental frequency of the driving current increases below the first preset frequency under acceleration conditions.
- the value is the first current value, and the fundamental wave frequency of the self-heating current is controlled to be the first frequency;
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the self-heating current value is controlled to decrease from the first current value to the second current value.
- the fundamental frequency of the self-heating current drops from the first frequency to the second frequency, and the second current value is close to 0 or equal to 0;
- the frequency peak shifting control subunit is also specifically used to:
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the self-heating current value is kept as the second current value, and the fundamental wave frequency of the self-heating current is kept as the second frequency until the stable signal is received.
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the frequency peak shifting control subunit is also specifically used for:
- the self-heating current value is controlled to be the first current value, And control the fundamental wave frequency of the self-heating current to the second frequency;
- the self-heating current value is controlled from the The first current value drops to the second current value, and the fundamental frequency of the self-heating current is controlled to rise from the second frequency to the first frequency, and the second current value is close to 0 or equal to 0;
- the frequency peak shifting control subunit is also specifically used to:
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- the self-heating current value When the stable signal is not received, the self-heating current value is kept as the second current value, and the fundamental frequency of the self-heating current is kept as the first frequency until the stable signal is received. After receiving the signal, the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- embodiments of the present disclosure provide a car, which includes: a controller configured to perform the method for suppressing vehicle vibration during battery self-heating as described in any one of the first aspects; or,
- the controller is configured to perform the method for suppressing vehicle vibration during battery self-heating as described in any one of the second aspects.
- the method for suppressing vehicle vibration during battery self-heating is applied to a vehicle including a power battery pack, a first motor and a second motor.
- the power battery pack is controlled to output a driving current to the first motor to drive the first motor.
- the motor rotates, and when the first motor rotates, it drags the second motor to rotate; the power battery pack is controlled to output a self-heating current to the second motor to perform self-heating of the power battery.
- the method for suppressing vehicle vibration during battery self-heating provided by this disclosure is proposed based on the author's breakthrough discovery of the direct cause of the second motor's vibration.
- the power battery pack is controlled to output a driving current to the first motor to drive the first motor to rotate.
- the first motor rotates, it drags the second motor to rotate, and the power battery pack is controlled to output a self-heating current to the second motor to perform self-heating of the power battery.
- the real-time speed of the first motor is obtained, and then the fundamental frequency of self-heating is controlled based on the real-time speed.
- the self-heating fundamental frequency that provides the heating energy source has a certain numerical relationship with the real-time rotation speed of the second motor, it will cause the second motor to vibrate. Therefore, according to the real-time rotation speed of the first motor, By controlling the fundamental frequency of self-heating so that the two do not satisfy a certain numerical relationship, the jitter of the second motor can be eliminated. That is, by changing the fundamental frequency of the heating source so that the self-heating fundamental frequency and the real-time rotational speed form a staggered peak, the jitter of the second motor can be eliminated, and the vehicle will not vibrate, which not only improves the driving experience of passengers, but also avoids damage to the second motor. Second, the service life of the motor.
- Figure 1 is a flow chart of a method for suppressing vehicle vibration during battery self-heating according to an embodiment of the present disclosure
- Figure 2 is a circuit structure diagram of a power battery, a first motor and a second motor in an embodiment of the present disclosure
- Figure 3 is an exemplary rotation speed-frequency curve diagram in an embodiment of the present disclosure
- Figure 4 is a flow chart of another method for suppressing vehicle vibration during battery self-heating according to an embodiment of the present disclosure
- Figure 5 is a block diagram of a device for suppressing vehicle vibration during battery self-heating according to an embodiment of the present disclosure
- FIG. 6 is a block diagram of another device for suppressing vehicle vibration during battery self-heating according to an embodiment of the present disclosure.
- part of the motors can be used for driving and the other part of the motors can be used for battery self-heating. This can achieve battery self-heating during driving.
- One is to reduce the vibration of the entire vehicle by installing a damping shock absorber; the other is to calculate the torque jitter based on the change in the angular velocity and moment of inertia of the drive motor, and control the rotation of the drive motor based on the torque jitter to reduce the vibration of the vehicle.
- the first method requires the installation of additional damping shock absorbers, which increases the corresponding hardware cost of the vehicle and also takes up a certain amount of vehicle space.
- the second method does not require additional hardware, the control logic is complex, and importantly, it does not fundamentally solve the jitter of the motor used for self-heating.
- the inventor proposes a targeted method for suppressing vehicle vibration during battery self-heating.
- the technical solution of the present disclosure is described in detail below.
- FIG. 1 a flow chart of a method for suppressing vehicle vibration during battery self-heating according to an embodiment of the present disclosure is shown.
- the method includes:
- Step 101 Control the power battery pack to output a driving current to the first motor to drive the first motor to rotate. When the first motor rotates, it drags the second motor to rotate.
- the method for suppressing vehicle vibration during battery self-heating proposed in the embodiment of the present disclosure is suitable for electric vehicles with at least two motors, and the electric vehicle works in which part of the motor drives the entire vehicle and the other part of the motor serves as a self-heating motor.
- the first motor uses the energy provided by the power battery pack to drive the entire vehicle, and at the same time, when the first motor rotates, it drags the second motor (that is, the motor used for self-heating) to rotate.
- the first motor can be a synchronous motor or an asynchronous motor.
- the first motor uses the energy provided by the power battery pack to drive the entire vehicle, and when rotating, it drags the second motor to rotate.
- the second motor is defined as Asynchronous motors, i.e. motors used for self-heating.
- Step 102 Control the power battery pack to output a self-heating current to the second motor to perform self-heating of the power battery.
- the power battery pack needs to output a self-heating current to the second motor, so that the second motor and its control circuit can be used to self-heat the power battery.
- FIG. 2 an exemplary circuit structure diagram of a power battery, a first motor, and a second motor in an embodiment of the present disclosure is shown.
- E represents the power battery
- M1 represents the first motor (i.e., the driving motor)
- M2 represents the second motor (i.e., the motor used for self-heating).
- the power battery is divided into a first battery group and a second battery group.
- a neutral line drawn from the neutral point of the second motor M2 is connected between the first battery pack and the second battery pack.
- the first motor M1 uses the energy provided by the power battery E to rotate to drive the entire vehicle. At the same time, when the first motor M1 rotates, it drags the second motor M2 to rotate.
- the power battery E outputs a self-heating current to the second motor M2, so that the second motor M2 and its control circuit are used to self-heat the power battery E.
- the control switch K4 is the control switch of the self-heating current loop. When self-heating is performed, the control switch K4 needs to be closed.
- the first battery pack and the second battery pack are realized by alternately switching on and off the upper and lower bridge arms of the motor inverter connected to M2. Battery pack and electricity The alternating charge and discharge between the motor windings. During the charge and discharge process, the internal resistance of the battery generates heat, thereby realizing self-heating of the battery.
- the specific on-off timing can be but is not limited to the following timing: (1) The upper arm of the motor inverter is turned on , the first battery pack (upper part) discharges and charges the motor winding, (2) the lower arm of the motor inverter is turned on, and the motor winding freewheels to charge the second battery pack (lower part), (3) the motor The lower arm of the inverter is turned on, and the second battery pack charges the motor winding. (4) The upper arm of the motor inverter is turned on, and the motor winding freewheels to charge the first battery pack; when self-heating is not required, the control switch K4 is disconnected.
- the working principles of the remaining components, such as the DC port, DC charging circuit switches K2, K3, capacitor C2, etc., as well as the working principles of other circuit loops can refer to the currently known working principles of electric vehicle circuit loops and will not be described again.
- Step 103 Obtain the real-time speed of the first motor.
- the inventor made a breakthrough discovery that the direct cause of jitter in self-heating motors is: when the fundamental frequency of the heating source that provides the heating energy source is , when there is a certain numerical relationship with the real-time speed of the motor used for self-heating, for example: when there is a multiple or functional relationship between the fundamental frequency of the heating source and the real-time speed of the motor used for self-heating, it will lead to Self-heating motor shakes.
- the rotation speed of the second motor is equal to the rotation speed of the first motor.
- the number of pole pairs of the first motor is 1, and according to my country's general power frequency of 50hz, it can be known that the speed of the first motor is 3000rpm, then the actual speed of the second motor may be 2960rpm, which is very close to 3000rpm, so the second motor can be considered The motor speed is 3000rpm. Therefore, it is first necessary to obtain the real-time rotation speed of the first motor, which is essentially equivalent to obtaining the real-time rotation speed of the second motor.
- Step 104 According to the real-time rotational speed, control the fundamental frequency of the self-heating current so that the fundamental frequency and the real-time rotational speed form a staggered peak.
- the fundamental frequency of the self-heating can be controlled so that the fundamental frequency of the self-heating and the real-time rotation speed of the first motor form a staggered peak (that is, the numerical relationship between the two is broken). , the jitter problem of the second motor can be solved from the root cause.
- the fundamental frequency of self-heating can be controlled by controlling the upper and lower bridge arms of the motor inverter connected to the second motor M2.
- the vehicle may also include an inverter for controlling the motor.
- the controller and the relevant contents are all existing technologies and will not be described again here.
- the method of controlling the fundamental frequency of self-heating according to the real-time rotation speed, so that the fundamental frequency of self-heating and the real-time rotation speed form a staggered peak can be divided into two methods:
- One method is: when the real-time speed is in the first speed range, control the fundamental frequency to be at the first frequency; when the real-time speed is in the second speed range, control the basic frequency to be at the second frequency; where, within the second speed range Any rotation speed is higher than any rotation speed within the first rotation speed range, and the second frequency is lower than the first frequency.
- the speed is divided into two speed intervals: the first speed interval and the second speed interval.
- the fundamental frequency is set to two frequencies: the first frequency and the second frequency.
- any rotation speed in the second rotation speed range is set to be higher than any rotation speed in the first rotation speed range, and the second frequency is set to be smaller than the first frequency.
- any rotation speed in the second rotation speed range to be lower than any rotation speed in the first rotation speed range, and the second frequency to be greater than the first frequency, as long as the condition that there is no numerical relationship between the rotation speed range and frequency is met.
- Another method considers that since self-heating is achieved by using the second motor and its winding loop and control loop, considering the impact of the change in the fundamental frequency on the second motor and the impact on the self-heating current, it is necessary to change the fundamental frequency When, the self-heating current is adjusted in advance. Therefore, when the fundamental frequency of self-heating is controlled so that the fundamental frequency and the real-time rotational speed form a staggered peak, the self-heating current value of the battery also needs to be controlled in advance.
- this method is: according to the real-time speed and real-time working conditions, control the frequency of the fundamental wave of self-heating so that the frequency of the fundamental wave of self-heating
- the frequency and real-time speed form a staggered peak.
- the so-called real-time working conditions include: acceleration working conditions or deceleration working conditions.
- the specific method of controlling the current value of battery self-heating and the fundamental frequency of self-heating includes the following steps:
- Step V1 Determine the expected speed based on the degree of depression of the accelerator pedal under acceleration conditions or the depression degree of the deceleration pedal under deceleration conditions.
- the expected speed represents the motor speed corresponding to the vehicle speed that the driver expects to reach;
- the real-time speed of the motor of an electric vehicle is generally collected by a speed sensor.
- the real-time working conditions of the vehicle during driving are generally divided into acceleration conditions and Deceleration conditions.
- acceleration conditions and Deceleration conditions When the driver steps on the accelerator pedal, it is naturally an acceleration condition, and when the driver steps on the deceleration pedal (i.e., the brake pedal), it is naturally a deceleration condition.
- the vehicle controller When the driver steps on the accelerator pedal, it is naturally an acceleration condition, and when the driver steps on the deceleration pedal (i.e., the brake pedal), it is naturally a deceleration condition.
- These information can be sent to the vehicle controller, or actively obtained by the vehicle controller; or the vehicle is under the control of the assisted driving system or the automatic driving system, and the vehicle controller may control the acceleration and deceleration of the vehicle according to the driving needs of the vehicle. They also correspond to acceleration conditions and deceleration conditions respectively.
- the driver when the driver steps on the accelerator pedal or the deceleration pedal, or when the controller controls the acceleration or deceleration of the vehicle by itself, it can reflect the current demand for vehicle acceleration or deceleration, and can reflect the current demand for vehicle acceleration or deceleration according to the degree of depression or deceleration of the accelerator pedal.
- the degree of pedaling or the signal sent by the controller determines the expected speed.
- the so-called expected speed refers to the motor speed corresponding to the vehicle speed that the driver expects to reach.
- the current speed of the vehicle is 30km/h
- the corresponding motor speed is 800rpm
- the driver steps on the accelerator pedal hoping to increase the vehicle speed to 80km/h
- the corresponding motor speed of 80km/h is 2600rpm
- the expected speed is 2600rpm.
- the principle of the expected speed under deceleration conditions is the same and will not be described in detail.
- the driver can directly set the required vehicle speed to 80km/h through hardware operation or language commands, and the vehicle controller can also determine the expected speed.
- Step V2 Control the self-heating current value and the fundamental frequency according to the relationship between the expected rotation speed and the plurality of preset rotation speeds, and the relationship between the real-time rotation speed and the plurality of preset rotation speeds, combined with the real-time working conditions.
- the self-heating current can be controlled based on the relationship between the expected speed and multiple preset speeds, and based on the relationship between the real-time speed and multiple preset speeds, combined with whether the real-time working condition is accelerating or decelerating. value, and control the fundamental wave frequency to be the first frequency, or control the fundamental wave frequency to change from the first frequency to the second frequency, or control the fundamental wave frequency to be the second frequency.
- the current self-heating fundamental wave frequency generally has two frequencies: the first frequency and the second frequency.
- the specific frequency can be 100hz and 300hz.
- the self-heating fundamental wave frequency can be determined based on the actual hardware equipment, needs and comprehensive consideration of various factors.
- the fundamental wave frequency needs to form a staggered peak with the real-time speed to avoid a certain numerical relationship with the real-time speed, therefore based on these two fundamental wave frequencies, the speed that has a certain numerical relationship with the fundamental wave frequency can be determined.
- the speed range within a certain range above and below the speed is determined as the speed sensitive area. It is considered that the second motor speed is within the speed sensitive zone, and there may be some numerical relationship with the fundamental frequency.
- the first frequency is 300hz
- the second frequency is 100hz
- the number of pole pairs of the second motor is 1
- the speed sensitive area corresponding to the first frequency 300hz is 2500rpm ⁇ 4000rpm
- the speed sensitive area corresponding to the second frequency 100hz is 800rpm. ⁇ 1500rpm.
- the rotational speed is determined to be higher than 2500rpm, there may be a certain numerical relationship with the fundamental frequency of 300hz.
- the first preset speed is determined as 1500rpm
- the second preset speed is determined as 2500rpm
- the interval from 1500rpm to 2500rpm is determined as the transition zone.
- the fundamental frequency is controlled to drop from 300hz to 100hz, or from 100hz up to 300hz.
- acceleration working condition and the deceleration working condition are slightly different, which are explained separately below.
- step V2 can specifically include the following steps:
- Step V2a If the expected speed is not higher than the second preset speed, then the real-time speed increases from 0 to the expected speed under acceleration conditions, the self-heating current value is controlled to be the first current value, and the fundamental frequency is controlled to be the first frequency. .
- the fundamental frequency is controlled to be the first frequency
- the real-time speed of the motor is Higher than the second preset speed, there may be a certain numerical relationship with the first frequency. Therefore, when the real-time speed of the motor is higher than the second preset speed, the fundamental frequency is controlled to be the second frequency.
- the self-heating current value is controlled to the first current value.
- the self-heating current value is controlled to a first current value, for example, 540A. Therefore, during the entire process when the real-time speed of the second motor rises from 0 to 2450 rpm, the self-heating current value is controlled to 540A, and the fundamental frequency of self-heating is controlled to 300hz to heat the power battery.
- Step V2b1 If the expected rotational speed is higher than the second preset rotational speed, during the process of the real-time rotational speed increasing from 0 to lower than the first preset rotational speed under the acceleration condition, the self-heating current value is controlled to be the first current value, and the The fundamental frequency is the first frequency;
- Step V2b2 In the process of the real-time rotation speed increasing from the first preset rotation speed to no higher than the second preset rotation speed, the self-heating current value is controlled to decrease from the first current value to the second current value, and the fundamental wave frequency is controlled from the first current value to the second current value. The first frequency drops to the second frequency, and the second current value is close to 0 or equal to 0.
- the fundamental frequency needs to be controlled to change, in order to ensure the efficiency of self-heating and take into account the requirement that the fundamental frequency cannot be the second frequency when the real-time speed is lower than the first preset speed. , and reduce the impact of the fundamental frequency on the second motor and the impact on the self-heating current.
- the real-time speed of the motor when the real-time speed of the motor is lower than the first preset speed, self-heating is performed with the first current value and the first frequency, and After the real-time speed of the motor is higher than the first preset speed, the self-heating current value is first reduced to the second current value, and then the fundamental frequency is controlled to drop from the first frequency to the second frequency, so that when the real-time speed of the motor increases to the second Before the second preset speed, reduce the fundamental frequency to 100hz to prevent the second motor from shaking.
- the self-heating current value is controlled to 540A, and the fundamental frequency of the heating source is controlled to 300hz.
- the self-heating current value is first controlled to decrease to close to 0 or directly to 0. Then start to control the fundamental frequency to drop from 300hz to 100hz to reduce the fundamental frequency to 100hz before the real-time speed of the motor increases to 2500rpm.
- the rotation speed in the transition zone does not have any numerical relationship with the fundamental frequency, whether the fundamental frequency is controlled to decrease from 300hz to 100hz or the fundamental frequency is controlled to increase from 100hz to 300hz, it will not cause the second motor to Jitter.
- Step V2b3 Confirm whether a stable signal is received, which indicates that the second motor does not generate a torque pulse ripple that oscillates back and forth;
- Step V2b4 When a stable signal is received, control the self-heating current value to increase from the second current value to the first current value, and keep the fundamental frequency at the second frequency;
- Step V2b5 When a stable signal is not received, keep the self-heating current value at the second current value, and keep the fundamental frequency at the second frequency. After receiving a stable signal, control the self-heating current value from the second current value. The value rises to the first current value, and the fundamental frequency is maintained at the second frequency.
- the frequency conversion process may have an impact on the second motor, causing the torque of the second motor to fluctuate, and may also cause The second motor vibrates, but this vibration may or may not occur only during the frequency conversion process. Even if it vibrates, compared with the vibration caused by a certain numerical relationship between the fundamental wave frequency and the real-time speed of the motor, Jitter is also much smaller and therefore negligible.
- the vehicle controller can also determine whether the second motor is stable based on whether the torque data of the second motor fluctuates.
- the self-heating current value can be controlled to increase from the second current value to the first current value to ensure the efficiency of self-heating and keep the fundamental frequency at the second frequency. After that, regardless of whether the real-time speed of the motor has not yet reached 2500rpm or is higher than 2500rpm, self-heating will be performed at the first current value and the second frequency.
- Another possibility is that the frequency conversion is completed, but the second motor state is lagging behind in stabilization. In this case, a stable signal will not be received, and the self-heating current value will continue to be the second current value, and the fundamental frequency will be maintained at the second value. frequency, until a stable signal is received, and then control the self-heating current value to increase from the second current value to the first current value, and keep the fundamental frequency at the second frequency.
- the self-heating current value is controlled to 540A, and the fundamental frequency of the self-heating is controlled to 300hz.
- the self-heating current value is first controlled to decrease to close to 0 or directly to 0. Then start to control the fundamental frequency from 300hz Down to 100hz to reduce the fundamental frequency to 100hz before the real-time motor speed increases to 2500rpm.
- the self-heating current value is controlled to increase from close to 0 or from 0 to 540A, and the fundamental frequency of the heating source is continued to be 100hz. , until the real-time motor speed increases to 2550rpm.
- the self-heating current value is still controlled to be close to 0 or 0, and the fundamental frequency of self-heating continues to be 100hz.
- the self-heating current value is controlled to increase from close to 0 or from 0 to 540A, and the fundamental frequency of self-heating is continued to be 100hz.
- the real-time speed of the motor increases to 2550rpm. It is understandable that in extreme cases, when the real-time motor speed increases to 2550rpm and a stable signal has not been received, the vehicle will continue to drive at the vehicle speed corresponding to the real-time motor speed of 2550rpm, and continue to maintain the fundamental frequency of self-heating at 100hz, etc.
- control the self-heating current value again from close to 0 or rising from 0 to 540A, and continue to maintain the fundamental frequency of self-heating at 100hz.
- step V2 can have the following steps:
- Step V2c If the expected speed is higher than the second preset speed, the real-time speed is reduced to the expected speed under deceleration conditions, the self-heating current value is controlled to be the first current value, and the fundamental frequency is controlled to be the second frequency.
- the self-heating current is controlled.
- the value is the first current value.
- the self-heating current value is controlled to 540A. Therefore, during the entire process when the real-time speed of the second motor is reduced from the current speed to 2550 rpm, the self-heating current value is controlled to be 540A, and the self-heating fundamental frequency is controlled to be 100hz to heat the battery.
- Step V2d1 If the expected speed is not higher than the second preset speed, then after the real-time speed is lower than the second preset speed under the deceleration condition, the self-heating current value is controlled to drop from the first current value to the second current value, and Control the fundamental frequency to rise from the second frequency to the first frequency, and the second current value is close to 0 or equal to 0;
- the fundamental frequency needs to be controlled to change.
- the second When the frequency changes to the first frequency first reduce the self-heating current value to the second current value, and then start to control the fundamental frequency to increase from the second frequency to the first frequency, so that before the real-time speed of the motor decreases to the first preset speed, Increase the fundamental frequency to 300hz to prevent the second motor from shaking.
- the current value to control the battery self-heating is 540A, and the fundamental wave of the heating source is controlled.
- the frequency is 100hz.
- the self-heating current value is first controlled to decrease to close to 0 or directly to 0. Then start to control the fundamental frequency to increase from 100hz to 300hz, so as to increase the fundamental frequency to 300hz before the real-time speed of the motor decreases to 1500rpm.
- the method further includes the following steps:
- Step V2d2 Confirm whether a stable signal is received
- Step V2d3 When a stable signal is received, control the self-heating current value to increase from the second current value to the first current value, and keep the fundamental frequency at the first frequency;
- Step V2d4 When a stable signal is not received, keep the self-heating current value at the second current value, and keep the fundamental frequency at the first frequency. After receiving a stable signal, control the self-heating current value from the second current value. The value rises to the first current value, and the fundamental frequency is maintained at the first frequency.
- the self-heating current value can be controlled to increase from the second current value to the first current value to ensure the efficiency of self-heating and keep the fundamental frequency at the first frequency. After that, no matter whether the real-time speed of the motor has not yet reached 1500rpm or is lower than 1500rpm, self-heating is performed at the first current value and the first frequency.
- Another possibility is that the frequency conversion is completed, but the second motor state is lagging behind in stabilization. In this case, a stable signal will not be received, and the self-heating current value will continue to be the second current value, and the fundamental frequency will be maintained at the first value. frequency, until a stable signal is received, and then the battery self-heating current value is controlled to increase from the second current value to the first current value, and the fundamental frequency is maintained at the first frequency.
- the self-heating current value is controlled to be 540A, and the fundamental wave frequency of self-heating is controlled to be 100hz.
- the self-heating current value is first controlled to decrease to close to 0 or directly to 0. Then start to control the fundamental frequency to increase from 100hz to 300hz, so as to increase the fundamental frequency to 300hz before the real-time speed of the motor decreases to 1500rpm.
- the self-heating current value is controlled to increase from close to 0 or from 0 to 540A again, and the fundamental frequency of the self-heating source is continued to be 300hz. , until the real-time motor speed decreases to 850rpm.
- the self-heating current value is still controlled to be close to 0 or 0, and the fundamental frequency of self-heating continues to be 300hz.
- the self-heating current value is controlled to increase from close to 0 or from 0 to 540A, and the fundamental frequency of self-heating is continued to be 300hz.
- the real-time speed of the motor is reduced to 850rpm. It is understandable that in extreme cases, when the real-time motor speed drops to 850rpm and a stable signal has not been received, the vehicle will continue to drive at the vehicle speed corresponding to the real-time motor speed of 850rpm, and continue to maintain the fundamental frequency of self-heating at 300hz, etc.
- control the self-heating current value again from close to 0 or from 0 to 540A, and continue to maintain the fundamental frequency of self-heating at 300hz.
- the above-mentioned frequency conversion of the fundamental frequency can be more intuitively understood with the help of the rotation speed-frequency curve shown in Figure 3.
- the X-axis represents the real-time speed of the motor
- the Y-axis represents the fundamental frequency
- X1 and X2 represent the first preset speed and the second preset speed respectively
- Y1 and Y0 represent the first frequency and the second frequency respectively.
- There are two curves between X1 and Figure 3 is only for the convenience of intuitive understanding of the frequency conversion of the fundamental frequency, and does not represent the corresponding actual motor speed when converting from the first frequency to the second frequency, or from the second frequency to the first frequency.
- the frequency conversion only needs to be completed between X1 and X2, and the frequency conversion is not limited to the actual motor speed at which the frequency conversion is completed.
- the determination of the preset rotation speed is also related to the number of pole pairs of the motor, because the rotation speed of the motor will be different if the number of pole pairs of the motor is different. For example, if the number of pole pairs of the motor is 1, then according to my country's general power frequency of 50hz, we can know that the motor's speed is 3000rpm. If the number of pole pairs of the motor is 2, then according to my country's general power frequency of 50hz, we can know that the motor's speed is 1500rpm. If the number of pole pairs of the motor is 4, then according to my country's general power frequency of 50hz, we can know that the motor's speed is 750rpm.
- the disclosed method of suppressing the vibration of the entire vehicle during the battery self-heating process can be applied to achieve the purpose of eliminating the jitter of the second motor.
- n 60f/p (n represents rotational speed, f represents frequency, and p represents the number of pole pairs) make simple conversions.
- the vehicle can suppress the vibration of the vehicle during the self-heating process of the battery in the dimension of rotation speed, and can also suppress the vibration of the vehicle in the process of self-heating of the battery in the dimension of frequency.
- the embodiment of the present disclosure also proposes another method of suppressing vehicle vibration during the self-heating process of the battery based on the dimension of frequency.
- FIG 4 another method of suppressing the self-heating process of the battery according to the embodiment of the present disclosure is shown.
- a flow chart of a method for vehicle vibration in a vehicle The method is also applied to vehicles including a power battery pack, a first motor and a second motor. The method includes:
- Step 401 Control the power battery pack to output driving current to the first motor to drive the first motor to rotate. When the first motor rotates, it drags the second motor to rotate;
- Step 402 Control the power battery pack to output a self-heating current to the second motor to perform self-heating of the power battery;
- Step 403 Obtain the fundamental frequency of the driving current of the first motor
- Step 404 Control the fundamental wave frequency of the self-heating current according to the fundamental wave frequency of the driving current, so that the fundamental wave frequency of the self-heating current and the fundamental wave frequency of the driving current form a staggered peak.
- step 404 Control the fundamental frequency of the self-heating current according to the fundamental frequency of the driving current, so that the fundamental frequency of the self-heating current and the fundamental frequency of the driving current form a staggered peak, including:
- the fundamental frequency of the driving current is located in the second frequency interval
- the fundamental frequency of the self-heating current is controlled to be located at the second frequency; wherein any frequency in the second frequency interval is higher than that in the first frequency interval. At any frequency, the second frequency is smaller than the first frequency.
- step 404 Control the fundamental frequency of the self-heating current according to the fundamental frequency of the driving current, so that the fundamental frequency of the self-heating current and the fundamental frequency of the driving current form a staggered peak, including:
- the fundamental frequency of the self-heating current is controlled according to the fundamental frequency of the driving current and real-time operating conditions, so that the fundamental frequency of the self-heating current Forming a peak shift with the driving current fundamental wave frequency, the real-time working conditions include: acceleration working conditions or deceleration working conditions.
- the fundamental frequency of the self-heating current is controlled according to the fundamental frequency of the driving current and real-time working conditions, so that the fundamental frequency of the self-heating current and the fundamental frequency of the driving current form a staggered peak, including :
- the magnitude relationship between the expected frequency and multiple preset frequencies and the magnitude relationship between the driving current fundamental frequency and the multiple preset frequencies, combined with the real-time working conditions, the self-heating current value and the Self-heating current fundamental frequency.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the self-heating current value and the The fundamental frequency of the self-heating current includes:
- the self-heating current value is controlled to be the first current. value, and control the fundamental wave frequency of the self-heating current to be the first frequency;
- the self-heating current is controlled during the process in which the fundamental frequency of the driving current increases below the first preset frequency under acceleration conditions.
- the value is the first current value, and the fundamental wave frequency of the self-heating current is controlled to be the first frequency;
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the self-heating current value is controlled to decrease from the first current value to the second current value.
- the fundamental frequency of the self-heating current drops from the first frequency to the second frequency, and the second current value is close to 0 or equal to 0;
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the self-heating current value is kept as the second current value, and the fundamental wave frequency of the self-heating current is kept as the second frequency until the stable signal is received.
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the self-heating current value and the The fundamental frequency of the self-heating current includes:
- the self-heating current value is controlled to be the first current value, And control the fundamental wave frequency of the self-heating current to the second frequency;
- the self-heating current value is controlled from the The first current value drops to the second current value, and the fundamental frequency of the self-heating current is controlled to rise from the second frequency to the first frequency, and the second current value is close to 0 or equal to 0;
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- the self-heating current value When the stable signal is not received, the self-heating current value is kept as the second current value, and the fundamental frequency of the self-heating current is kept as the first frequency until the stable signal is received. After receiving the signal, the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- the difference between the method of steps 401 to 404 and the method of steps 101 to 104 is that what is obtained is the fundamental frequency of the driving current of the first motor, and the fundamental frequency of the driving current of the first motor can be determined according to the frequency of the first motor.
- the real-time speed is obtained through simple calculation.
- the first speed range, the second speed range, the expected speed, the first preset speed, and the second preset speed in the above steps can also be calculated. to the corresponding first frequency interval, second frequency interval, expected frequency, first preset frequency and second preset frequency.
- the rest of the methods are the same.
- the fundamental wave frequency of the self-heating current is controlled (that is, equivalent to the fundamental wave of self-heating in the method of steps 101 to 104).
- the specific method of frequency please refer to the methods of steps 101 to 104 mentioned above, and will not be described in detail.
- the present disclosure provides a method for suppressing vehicle vibration during battery self-heating.
- the real-time rotation speed or the driving current fundamental frequency of the first motor is obtained, and then the self-heating is controlled based on the real-time rotation speed or the driving current fundamental frequency. If the fundamental frequency changes, so that the real-time speed of the second motor or the fundamental frequency of the driving current and the fundamental frequency of self-heating do not always satisfy a certain numerical relationship, the jitter of the second motor can be eliminated, making the entire The car will not vibrate, which not only improves the driving experience of passengers, but also avoids damaging the service life of the second motor.
- an embodiment of the present disclosure also proposes a device for suppressing vehicle vibration during battery self-heating.
- Figure 5 shows a method of suppressing battery self-heating process according to an embodiment of the present disclosure.
- a block diagram of a device for vehicle vibration. The device is applied to a vehicle including a power battery pack, a first motor and a second motor.
- the device includes:
- the rotation control module 510 is used to control the power battery pack to output driving current to the first motor to drive the first motor to rotate. When the first motor rotates, it drags the second motor to rotate;
- Control the self-heating module 520 to control the power battery pack to output a self-heating current to the second motor to perform self-heating of the power battery;
- the acquisition module 530 is used to acquire the real-time rotation speed of the first motor
- the frequency control module 540 is used to control the fundamental frequency of self-heating according to the real-time rotation speed, so that the fundamental frequency and the real-time rotation speed form a peak shift.
- control frequency module 540 includes:
- a first control unit configured to control the fundamental frequency to be at the first frequency when the real-time rotational speed is within the first rotational speed range
- a second control unit configured to control the basic frequency to be at a second frequency when the real-time rotational speed is in the second rotational speed interval; wherein any rotational speed in the second rotational speed interval is higher than that in the first rotational speed interval. At any rotation speed, the second frequency is smaller than the first frequency.
- control frequency module 540 includes:
- a working condition control frequency unit is used to control the fundamental frequency according to the real-time speed and real-time working conditions, so that the fundamental frequency and the real-time speed form a peak shift.
- the real-time working conditions include: acceleration working conditions or Deceleration conditions.
- the operating condition control frequency unit includes:
- the expected rotational speed subunit is used to determine the expected rotational speed based on the degree of depression of the accelerator pedal under the acceleration condition or the depression of the deceleration pedal under the deceleration condition.
- the expected rotational speed represents the motor corresponding to the vehicle speed that the driver expects to reach. Rotating speed;
- a working condition control subunit configured to control self-heating based on the relationship between the expected rotating speed and multiple preset rotating speeds, and the relationship between the real-time rotating speed and the multiple preset rotating speeds, combined with the real-time working conditions. current value and the fundamental frequency.
- the plurality of preset rotation speeds include: a first preset rotation speed, a second preset rotation speed;
- the working condition control subunit has functions for:
- the self-heating current value is controlled to be the first current value, and Control the fundamental wave frequency to be the first frequency;
- the self-heating current value is controlled to be a third value. a current value, and controlling the fundamental wave frequency to be the first frequency;
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the base current value is controlled.
- the wave frequency drops from the first frequency to the second frequency, and the second current value is close to 0 or equal to 0.
- the working condition control subunit is also specifically used to:
- the self-heating current value is maintained at the second current value and the fundamental frequency is maintained. is the second frequency, until the stable signal is received, the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency is maintained at the third frequency. Second frequency.
- the plurality of preset rotation speeds include: a first preset rotation speed, a second preset rotation speed;
- the working condition control subunit is also specifically used for:
- the self-heating current value is controlled to be the first current value, and all the current values are controlled.
- the fundamental frequency is the second frequency
- the self-heating current value is controlled from the first current
- the value drops to the second current value, and the fundamental wave frequency is controlled to rise from the second frequency to the first frequency, and the second current value is close to 0 or equal to 0;
- the working condition control subunit is also specifically used to:
- the self-heating current value is kept as the second current value, and the fundamental frequency is kept as the first frequency until the stable signal is received,
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental wave frequency is maintained at the first frequency.
- an embodiment of the present disclosure also provides another device for suppressing vehicle vibration during battery self-heating.
- another device for suppressing battery self-heating Referring to FIG. 6 , an embodiment of the present disclosure also provides another device for suppressing battery self-heating.
- the rotation drag module 610 is used to control the power battery pack to output driving current to the first motor to drive the first motor to rotate, and when the first motor rotates, it drags the second motor to rotate;
- the current self-heating module 620 is used to control the power battery pack to output self-heating current to the second motor to perform self-heating of the power battery;
- the self-heating fundamental wave frequency control module 640 is used to control the self-heating current fundamental wave frequency according to the driving current fundamental wave frequency, so that the self-heating current fundamental wave frequency and the driving current fundamental wave frequency form a staggered peak.
- the self-heating fundamental wave frequency control module 640 includes:
- a first unit configured to control the fundamental frequency of the self-heating current to be at the first frequency when the fundamental frequency of the driving current is in the first frequency interval;
- the second unit is used to control the basic frequency of the self-heating current to be at the second frequency when the fundamental frequency of the driving current is in the second frequency interval; wherein any frequency in the second frequency interval is higher than the Any frequency within the first frequency interval, the second frequency is smaller than the first frequency.
- the self-heating fundamental wave frequency control module 640 includes:
- a frequency peak-shifting control unit is used to control the self-heating current fundamental wave frequency according to the driving current fundamental wave frequency and real-time working conditions, so that the self-heating current fundamental wave frequency and the driving current fundamental wave frequency form a peak-shifting frequency.
- the real-time working conditions include: acceleration working conditions or deceleration working conditions.
- the frequency peak shifting control unit includes:
- the expected speed under working conditions subunit is used to determine the expected speed according to the degree of stepping on the accelerator pedal under the acceleration working condition or the stepping degree of the deceleration pedal under the deceleration working condition.
- the expected speed represents the vehicle speed that the driver expects to reach. motor speed;
- the frequency peak shifting control subunit is used to combine the real-time working conditions according to the relationship between the expected frequency and multiple preset frequencies, and the relationship between the driving current fundamental wave frequency and the multiple preset frequencies. , control the self-heating current value and the fundamental wave frequency of the self-heating current.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the frequency peak shifting control subunit is specifically used for:
- the driving current fundamental frequency increases to the expected frequency under acceleration conditions.
- the self-heating current value is controlled to be a first current value
- the fundamental wave frequency of the self-heating current is controlled to be a first frequency
- the self-heating current is controlled during the process in which the fundamental frequency of the driving current increases below the first preset frequency under acceleration conditions.
- the value is the first current value, and the fundamental wave frequency of the self-heating current is controlled to be the first frequency;
- the self-heating current value is controlled to decrease from the first current value to the second current value, and the self-heating current value is controlled to decrease from the first current value to the second current value.
- the fundamental frequency of the self-heating current drops from the first frequency to the second frequency, and the second current value is close to 0 or equal to 0;
- the frequency peak shifting control subunit is also specifically used to:
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the self-heating current value is kept as the second current value, and the fundamental wave frequency of the self-heating current is kept as the second frequency until the stable signal is received.
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the second frequency.
- the plurality of preset frequencies include: a first preset frequency, a second preset frequency;
- the frequency peak shifting control subunit is also specifically used for:
- the self-heating current value is controlled to be the first current value, And control the fundamental wave frequency of the self-heating current to the second frequency;
- the self-heating current value is controlled from the The first current value drops to the second current value, and the fundamental frequency of the self-heating current is controlled to rise from the second frequency to the first frequency, and the second current value is close to 0 or equal to 0;
- the frequency peak shifting control subunit is also specifically used to:
- the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- the self-heating current value When the stable signal is not received, the self-heating current value is kept as the second current value, and the fundamental frequency of the self-heating current is kept as the first frequency until the stable signal is received. After receiving the signal, the self-heating current value is controlled to rise from the second current value to the first current value, and the fundamental frequency of the self-heating current is maintained at the first frequency.
- an embodiment of the present disclosure also proposes a car.
- the car includes: a controller, the controller is used to perform any one of the above steps 101 to 104 to suppress the battery.
- the method of the whole vehicle vibrating during the self-heating process; or, the controller is used to perform the method of suppressing the vehicle vibration during the battery self-heating process as described in any one of the above steps 401 to 404.
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Abstract
一种抑制电池自加热过程中车辆震动的方法、装置以及汽车,方法包括:控制动力电池包(E)向第一电机(M1)输出驱动电流以驱动第一电机转动,第一电机转动时拖曳第二电机(M2)转动;控制动力电池包向第二电机输出自加热电流以进行动力电池的自加热;获取第一电机的实时转速;根据实时转速控制自加热电流的基波频率,使基波频率与实时转速形成错峰。
Description
相关公开的交叉引用
本公开基于申请号为202210992723.9,申请日为2022年08月18日的中国专利申请提出,并要求该中国专利申请的优先权,该中国专利申请的全部内容在此引入本公开作为参考。
本公开涉及电池技术领域,特别是涉及一种抑制电池自加热过程中车辆震动的方法、装置以及汽车。
目前随着新能源的广泛使用,电池可作为动力源应用在车辆领域中。电池作为动力源使用的环境不同,电池的性能也会受到影响。在低温环境下,当电动汽车驱动行驶时,电池包受到低温环境影响,电池包内部活跃性物质的活跃性明显下降,其电池内阻也会随着温度降低而增大,所以在低温环境下,电动汽车的续航里程会有明显的下降。为了保证电池包内部的活跃性不受低温环境影响,需要对电池包加热,使其本体温度上升。
目前电池包加热的方式多数是通过外加热的方式进行加热,例如但不限于风热或水热等方式。此种加热方式导致电池包加热装置的制造成本高,且加热效果较差以使得电池包在加热作业中需要消耗较大的电量。
相关技术中还存在利用电机与电池之间进行交替脉冲充放电,以通过电池内阻发热实现电池自加热的方案,相比外部加热,其加热效率更高。
对于配置了多个电机的电动汽车,还可以利用部分电机用于驱动,另一部分电机用于电池自加热,这样可以实现在行车过程中的电池自加热,但发明人发现这种自加热方式会造成用于自加热的电机抖动,进而造成整车震动,并且震感强烈,不但给乘客带来糟糕的驾驶体验,而且损伤电机的使用寿命。目前还未有发现造成电机抖动的直接原因,更谈不上如何解决该问题。
公开内容
鉴于上述问题,提出了本公开以便提供克服上述问题或者至少部分地解决上述问题的一种抑制电池自加热过程中车辆震动的方法、装置以及汽车。
第一方面,本公开实施例提供一种抑制电池自加热过程中车辆震动的方法,所述方法应用于包括动力电池包、第一电机和第二电机的车辆,所述方法包括:
控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;
控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;
获取第一电机的实时转速;
根据所述实时转速控制自加热电流的基波频率,使所述基波频率与所述实时转速形成错峰。
在一些实施例中,所述根据所述实时转速控制自加热的基波频率,使所述基波频率与所述实时转速形成错峰,包括:
当所述实时转速位于第一转速区间时,控制所述基波频率位于第一频率;
当所述实时转速位于第二转速区间时,控制所述基本频率位于第二频率;其中,所述第二转速区间内的任意转速高于所述第一转速区间内的任意转速,所述第二频率小于所述第一频率。
在一些实施例中,所述根据所述实时转速,控制自加热的基波频率,使所述基波频率与所述实时转速形成错峰,包括:
根据所述实时转速和实时工况控制所述基波频率,使所述基波频率与所述实时转速形成错峰,所述实时工况包括:加速工况或者减速工况。
在一些实施例中,所述根据所述实时转速和实时工况控制所述基波频率,使所述基波频率与所述实
时转速形成错峰,包括:
根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;
根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制自加热电流值和所述基波频率。
在一些实施例中,多个预设转速包括:第一预设转速、第二预设转速;
所述根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制自加热电流值和所述基波频率,包括:
若所述预期转速不高于所述第二预设转速,则在加速工况下所述实时转速升高至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第一频率;
若所述预期转速高于所述第二预设转速,则在加速工况下所述实时转速升高至低于所述第一预设转速的过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为所述第一频率;
在所述实时转速从所述第一预设转速升高至所述预期转速的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0。
在一些实施例中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第一频率下降到第二频率之后,还包括:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率。
在一些实施例中,多个预设转速包括:第一预设转速、第二预设转速;
所述根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制所述自加热电流值和所述基波频率,包括:
若所述预期转速高于所述第二预设转速,则在减速工况下所述实时转速降低至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第二频率;
若所述预期转速不高于所述第二预设转速,则在减速工况下所述实时转速低于所述第二预设转速后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0;
在一些实施例中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第二频率上升到第一频率之后,还包括:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率。
在一些实施例中,所述第一预设转速和所述第二预设转速的取值,由所述第一频率、所述第二频率以及电机极对数决定。
在一些实施例中,所述第一电机为同步电机或异步电机,所述第二电机为异步电机。
第二方面,本公开实施例还提供另一种抑制电池自加热过程中车辆震动的方法,所述方法应用于包括动力电池包、第一电机和第二电机的车辆,所述方法包括:
控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;
控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;
获取所述第一电机的驱动电流基波频率;
根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰。
在一些实施例中,所述根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:
当所述驱动电流基波频率位于第一频率区间时,控制所述自加热电流基波频率位于第一频率;
当所述驱动电流基波频率位于第二频率区间时,控制所述自加热电流基本频率位于第二频率;其中,所述第二频率区间内的任意频率高于所述第一频率区间内的任意频率,所述第二频率小于所述第一频率。
在一些实施例中,所述根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:
根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,所述实时工况包括:加速工况或者减速工况。
在一些实施例中,所述根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:
根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;
根据所述预期转速确定对应于所述预期转速的预期频率;
根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
所述根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率,包括:
若所述预期频率不高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第一频率;
若所述预期频率高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至低于所述第一预设频率的过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为所述第一频率;
在所述驱动电流基波频率从所述第一预设频率升高至所述预期频率的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0;
在一些实施例中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率之后,还包括:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
所述根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率,包括:
若所述预期频率高于所述第二预设频率,则在减速工况下所述驱动电流基波频率降低至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第二频率;
若所述预期频率不高于所述第二预设频率,则在减速工况下所述驱动电流基波频率低于所述第二预
设频率后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0;
在一些实施例中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率之后,还包括:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率。
第三方面,本公开实施例提供一种抑制电池自加热过程中车辆震动的装置,所述装置应用于包括动力电池包、第一电机和第二电机的车辆,所述装置包括:
控制转动模块,用于控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;
控制自加热模块,用于控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;
获取模块,用于获取第一电机的实时转速;
控制频率模块,用于根据所述实时转速控制自加热的基波频率,使所述基波频率与所述实时转速形成错峰。
在一些实施例中,所述控制频率模块包括:
第一控制单元,用于当所述实时转速位于第一转速区间时,控制所述基波频率位于第一频率;
第二控制单元,用于当所述实时转速位于第二转速区间时,控制所述基本频率位于第二频率;其中,所述第二转速区间内的任意转速高于所述第一转速区间内的任意转速,所述第二频率小于所述第一频率。
在一些实施例中,所述控制频率模块包括:
工况控制频率单元,用于根据所述实时转速和实时工况控制所述基波频率,使所述基波频率与所述实时转速形成错峰,所述实时工况包括:加速工况或者减速工况。
在一些实施例中,所述工况控制频率单元包括:
期望转速子单元,用于根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;
工况控制子单元,用于根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制自加热电流值和所述基波频率。
在一些实施例中,多个预设转速包括:第一预设转速、第二预设转速;
所述工况控制子单元具有用于:
若所述预期转速不高于所述第二预设转速,则在加速工况下所述实时转速升高至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第一频率;
若所述预期转速高于所述第二预设转速,则在加速工况下所述实时转速升高至低于所述第一预设转速的过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为所述第一频率;
在所述实时转速从所述第一预设转速升高至所述预期转速的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0。
在一些实施例中,所述工况控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率
为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率。
在一些实施例中,多个预设转速包括:第一预设转速、第二预设转速;
所述工况控制子单元还具体用于:
若所述预期转速高于所述第二预设转速,则在减速工况下所述实时转速降低至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第二频率;
若所述预期转速不高于所述第二预设转速,则在减速工况下所述实时转速低于所述第二预设转速后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0;
在一些实施例中,所述工况控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率。
第四方面,本公开实施例还提供另一种抑制电池自加热过程中车辆震动的装置,所述装置应用于包括动力电池包、第一电机和第二电机的车辆,所述装置包括:
转动拖曳模块,用于控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;
电流自加热模块,用于控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;
获取驱动基波频率模块,用于获取所述第一电机的驱动电流基波频率;
控制自加热基波频率模块,用于根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰。
在一些实施例中,所述控制自加热基波频率模块包括:
第一单元,用于当所述驱动电流基波频率位于第一频率区间时,控制所述自加热电流基波频率位于第一频率;
第二单元,用于当所述驱动电流基波频率位于第二频率区间时,控制所述自加热电流基本频率位于第二频率;其中,所述第二频率区间内的任意频率高于所述第一频率区间内的任意频率,所述第二频率小于所述第一频率。
在一些实施例中,所述控制自加热基波频率模块包括:
频率错峰控制单元,用于根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,所述实时工况包括:加速工况或者减速工况。
在一些实施例中,所述频率错峰控制单元包括:
工况预期转速子单元,用于根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;
确定预期频率子单元,用于根据所述预期转速确定对应于所述预期转速的预期频率;
频率错峰控制子单元,用于根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
所述频率错峰控制子单元具体用于:
若所述预期频率不高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第一频率;
若所述预期频率高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至低于所述第一预设频率的过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为所述第一频率;
在所述驱动电流基波频率从所述第一预设频率升高至所述预期频率的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0;
在一些实施例中,所述频率错峰控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
所述频率错峰控制子单元还具体用于:
若所述预期频率高于所述第二预设频率,则在减速工况下所述驱动电流基波频率降低至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第二频率;
若所述预期频率不高于所述第二预设频率,则在减速工况下所述驱动电流基波频率低于所述第二预设频率后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0;
在一些实施例中,所述频率错峰控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率。
第五方面,本公开实施例提供一种汽车,所述汽车包括:控制器,所述控制器用于执行如第一方面任一所述的抑制电池自加热过程中车辆震动的方法;或者,
所述控制器用于执行如第二方面任一所述的抑制电池自加热过程中车辆震动的方法。
本公开提供的抑制电池自加热过程中车辆震动的方法,应用于包括动力电池包、第一电机和第二电机的车辆,具体工作时控制动力电池包向第一电机输出驱动电流以驱动第一电机转动,第一电机转动时拖曳第二电机转动;控制动力电池包向第二电机输出自加热电流以进行动力电池的自加热。
本公开提供的抑制电池自加热过程中车辆震动的方法是在公开人突破性的发现造成第二电机抖动直接原因的基础上提出的。在控制动力电池包向第一电机输出驱动电流以驱动第一电机转动,第一电机转动时拖曳第二电机转动,且控制动力电池包向第二电机输出自加热电流以进行动力电池的自加热的情况下,获取第一电机的实时转速,之后根据实时转速,控制自加热的基波频率。由于公开人发现当提供加热能量来源的自加热的基波频率,与第二电机的实时转速存在数值上的某种关系时,就会导致第二电机抖动,因此根据第一电机的实时转速,控制自加热的基波频率,使得两者之间不满足数值上的某种关系,即可消除第二电机的抖动。即:改变加热源的基波频率,使得自加热的基波频率与实时转速形成错峰,即可消除第二电机抖动,车辆不会震动,提升乘客驾驶体验感的同时,还避免了损伤第二电机的使用寿命。
通过阅读下文优选实施方式的详细描述,各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的,而并不认为是对本公开的限制。而且在整个附图中,用
相同的参考符号表示相同的部件。在附图中:
图1是本公开实施例一种抑制电池自加热过程中车辆震动的方法的流程图;
图2是本公开实施例中动力电池、第一电机以及第二电机的电路结构图;
图3是本公开实施例中一种示例性的转速-频率曲线图;
图4是本公开实施例另一种抑制电池自加热过程中车辆震动的方法的流程图;
图5是本公开实施例一种抑制电池自加热过程中车辆震动的装置的框图;
图6是本公开实施例另一种抑制电池自加热过程中车辆震动的装置的框图。
为使本公开的上述目的、特征和优点能够更加明显易懂,下面结合附图和具体实施方式对本公开作进一步详细的说明。应当理解,此处所描述的具体实施例仅用以解释本公开,仅仅是本公开一部分实施例,而不是全部的实施例,并不用于限定本公开。
发明人发现,目前电动汽车的电池包进行自加热多数是在车辆停驶状态下完成,而在车辆行驶过程中较少进行加热。对于有多个电机的电动汽车,例如四驱电动汽车来说,可以利用部分电机用于驱动,另一部分电机用于电池自加热,这样可以实现在行车过程中的电池自加热。但发明人发现,目前在行驶过程中采用这种自加热方式时,会造成用于自加热的电机抖动,进而造成整车抖动。技术人员认为这是由于驱动电机系统本身的抖动问题造成的,例如:电动汽车在行驶起步或者在以某速度区间内行驶时,驱动电机的扭矩瞬间发生跳变,造成用于自加热的电机抖动从而造成整车出现震动。
正是基于上述认知,目前解决这个问题的方法有两种:
一种是通过安装阻尼减震器削减整车震动;另一种是根据驱动电机角速度的变化和转动惯量,计算扭矩抖动量,结合扭矩抖动量控制驱动电机转动,达到削减整车震动的目的。
但上述两种方法中,第一种方法需要额外安装阻尼减震器,增加车辆相应的硬件成本同时,还占用一定的车辆空间。第二种方法虽然无需额外增加硬件,但控制逻辑复杂,重要的是并没有从根本上解决用于自加热的电机的抖动。
由于并没有从源头上发现造成用于自加热的电机抖动的直接原因,更谈不上如何解决该问题,因此采用上述两种方法实质上并没有解决用于自加热的电机抖动的问题,仅仅是治标不治本。
基于上述问题,发明人提出了针对性的抑制电池自加热过程中车辆震动的方法,以下对本公开的技术方案进行详细说明。
参照图1,示出了本公开实施例一种抑制电池自加热过程中车辆震动的方法的流程图。该方法包括:
步骤101:控制动力电池包向第一电机输出驱动电流以驱动第一电机转动,第一电机转动时拖曳第二电机转动。
本公开实施例所提的抑制电池自加热过程中车辆震动的方法,适用于具备至少两个电机的电动车,并且电动车是工作在其中部分电机驱动整车、另一部分电机作为自加热电机的状态下,即第一电机利用动力电池包提供的能量驱动整车运行,同时第一电机转动时拖拽第二电机(即用于自加热的电机)转动。本公开实施例中定义第一电机可以为同步电机,也可以为异步电机,第一电机利用动力电池包提供的能量驱动整车运行,且转动时拖拽第二电机转动,定义第二电机为异步电机,即用于自加热的电机。
步骤102:控制动力电池包向第二电机输出自加热电流以进行动力电池的自加热。
在第一电机拖曳第二电机转动的同时,为了实现对动力电池的自加热,需要动力电池包向第二电机输出自加热电流,以利用第二电机及其控制回路进行动力电池的自加热。
参照图2,示例性的示出了本公开实施例中动力电池、第一电机以及第二电机的电路结构图。图2中E表示动力电池、M1表示第一电机(即驱动电机)、M2表示第二电机(即用于自加热的电机),动力电池被分为第一电池组和第二电池组,第二电机M2的中性点引出中性线连接于第一电池组和第二电池组之间。第一电机M1利用动力电池E提供的能量转动,进而驱动整车运行,同时第一电机M1转动时拖拽第二电机M2转动。动力电池E向第二电机M2输出自加热电流,以利用第二电机M2及其控制回路进行动力电池E的自加热。其中控制开关K4是自加热电流回路的控制开关,当进行自加热时,控制开关K4需要闭合,通过与M2连接的电机逆变器的上下桥臂的交替通断实现第一电池组、第二电池组与电
机绕组之间的交替充放电,在充放电过程中电池内阻生热,从而实现电池自加热,具体的通断时序可以但不限于如下时序:(1)电机逆变器上桥臂导通,第一电池组(上半部分)放电,给电机绕组充电,(2)电机逆变器下桥臂导通,电机绕组续流给第二电池组(下半部分)充电,(3)电机逆变器下桥臂导通,第二电池组给电机绕组充电,(4)电机逆变器上桥臂导通,电机绕组续流给第一电池组充电;当无需自加热时,控制开关K4断开。其余元件,例如:直流口、直流充电回路开关K2、K3、电容C2等的工作原理,以及其它电路回路的工作原理参照目前已知电动汽车电路回路工作原理即可,不再赘述。
步骤103:获取第一电机的实时转速。
发明人对自加热的方式、原理、电机的特性等经过大量综合研究、测试,突破性的发现造成用于自加热的电机抖动的直接原因是:当提供加热能量来源的加热源的基波频率,与用于自加热的电机的实时转速存在数值上的某种关系时,例如:加热源的基波频率与用于自加热的电机的实时转速存在倍数或者函数关系时,就会导致用于自加热的电机抖动。
一般情况下,由于第一电机是驱动电机,其拖拽第二电机转动,因此可以认为第二电机的转速等同于第一电机转速。例如:第一电机极对数为1,则根据我国通用工频50hz可以知晓,第一电机的转速为3000rpm,那么第二电机实际上的转速可能为2960rpm,十分接近3000rpm,因此可以认为第二电机的转速就为3000rpm。因此首先需要获取第一电机的实时转速,实质上可以等同于获取到第二电机的实时转速。
步骤104:根据实时转速,控制自加热电流的基波频率,使基波频率与实时转速形成错峰。
在获取到第一电机实时转速后,即可控制自加热的基波频率,以使得自加热的基波频率与第一电机的实时转速形成错峰(即打破两者之间存在的数值关系),即可从根源上解决第二电机的抖动问题。
本领域技术人员应当理解,自加热的基波频率是可以通过控制与第二电机M2连接的电机逆变器的上下桥臂通断来控制的,车辆中还可以包括用于控制电机逆变器的控制器,相关内容均为现有技术,在此不再赘述。
具体根据实时转速控制自加热的基波频率,使自加热的基波频率与实时转速形成错峰的方法上,可以分成两种方法:
一种方法为:当实时转速位于第一转速区间时,控制基波频率位于第一频率;当实时转速位于第二转速区间时,控制基本频率位于第二频率;其中,第二转速区间内的任意转速高于第一转速区间内的任意转速,第二频率小于第一频率。
因为自加热的基波频率与第一电机的实时转速需要形成错峰,打破两者之间存在的数值关系,所以将转速划分为两个转速区间:第一转速区间和第二转速区间,将基波频率设定为两个频率:第一频率和第二频率。
设定第一转速区间与第一频率之间不存在数值关系,第二转速区间与第二频率之间不存在数值关系,那么当实时转速位于第一转速区间时,仅需控制基波频率位于第一频率即可解决第二电机的抖动问题,当实时转速位于第二转速区间时,仅需控制基本频率位于第二频率即可解决第二电机的抖动问题。本公开实施例中,设定第二转速区间内的任意转速高于第一转速区间内的任意转速,第二频率小于第一频率。当然,也可以设定第二转速区间内的任意转速低于第一转速区间内的任意转速,第二频率大于第一频率,只要符合转速区间与频率之间不存在数值关系的条件即可。
另一种方法考虑到由于自加热是利用第二电机及其绕组回路、控制回路实现的,考虑到基波频率改变对第二电机的冲击以及对自加热电流的影响,需要在改变基波频率时,提前对自加热电流进行调整,因此控制自加热的基波频率使基波频率与实时转速形成错峰时,还需要提前控制电池自加热的电流值。同时考虑到变频需要一定的时间,而加速工况和减速工况还需区别对待,因此该种方法为:根据实时转速和实时工况,控制自加热的基波频率,使自加热的基波频率与实时转速形成错峰,所谓实时工况包括:加速工况或者减速工况。
具体控制电池自加热的电流值,以及控制自加热的基波频率的方法包括如下步骤:
步骤V1:根据加速工况下加速踏板的踩踏程度或者减速工况下减速踏板的踩踏程度,确定预期转速,预期转速表征驾驶员期望达到的车速对应的电机转速;
电动汽车的电机实时转速一般由转速传感器采集,行驶过程中车辆的实时工况一般分为加速工况和
减速工况。驾驶员踩踏加速踏板,自然就是加速工况,驾驶员踩踏减速踏板(即刹车踏板),自然就是减速工况。这些信息具可发送至整车控制器,或者由整车控制器主动获取得到;或者车辆在辅助驾驶系统或自动驾驶系统控制下,车辆控制器可能根据车辆行驶需要自行控制车辆的加速和减速,也分别对应着加速工况和减速工况。
在一种实施例中,驾驶员踩踏加速踏板或者减速踏板时,或者控制器自行控制车辆的加速或减速时,可以反映出当前需求车辆加速还是车辆减速,并可以根据加速踏板的踩踏程度或者减速踏板的踩踏程度或者控制器发出的信号,确定预期转速,所谓的预期转速,是表征驾驶员期望达到的车速对应的电机转速。例如:车辆当前车速30km/h,对应的电机转速为800rpm,驾驶员踩踏加速踏板,期望将车速提升至80km/h,而80km/h对应的电机转速为2600rpm,则期望转速就为2600rpm。减速工况下的预期转速原理与此相同,不多赘述。
当然,还可以采用其它方式确定预期转速,例如:驾驶员可通过硬件操作方式或者语言命令等方式直接设定需求车速为80km/h,则整车控制器同样也可以确定出预期转速。
步骤V2:根据预期转速与多个预设转速的大小关系,以及实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制自加热的电流值,和基波频率。
确定预期转速后,即可根据预期转速与多个预设转速的大小关系,以及根据实时转速与多个预设转速的大小关系,再结合实时工况是加速还是减速,进而控制自加热的电流值,以及控制基波频率为第一频率,或者控制基波频率从第一频率变为第二频率,或者控制基波频率为第二频率。
目前的自加热基波频率一般有两个频率:第一频率、第二频率。例如具体可以为100hz和300hz,当然自加热基波频率可以按照实际硬件设备、需求以及多种因素的综合考量,决定具体频率。
因为基波频率要和实时转速形成错峰,避开与实时转速数值上的某种关系,因此根据这两个基波频率,可以确定出与基波频率存在某种数值关系的转速。考虑到第二电机转速与第一电机转速有略微的差距,以及转速获取的精度问题,以确定出的转速为基础,将该转速上、下一定区间范围内的转速区间确定为转速敏感区,认为第二电机转速处于该转速敏感区内,就可能与基波频率存在某种数值关系。
另外,还考虑到控制基波频率的上升或者下降,是需要一定时长的,而并不能在很短时长内就控制基波频率从第一频率降到第二频率,或者是从第二频率上升到第一频率,还需要一个过渡区,综合过渡区和转速敏感区两个因素,因此,设定两个预设转速,结合实际转速以及预期转速,控制基波频率和自加热电流值。
示例的,假设第一频率为300hz,第二频率为100hz,第二电机极对数为1,对应第一频率300hz的转速敏感区为2500rpm~4000rpm,对应第二频率100hz的转速敏感区为800rpm~1500rpm。考虑到控制基波频率从300hz降到100hz,或者是从100hz上升到300hz都需要一定时长。因此,确定转速低于1500rpm的情况下,可能会与100hz的基波频率存在某种数值关系,确定转速高于2500rpm的情况下,可能会与300hz的基波频率存在某种数值关系。将第一预设转速确定为1500rpm,将第二预设转速确定为2500rpm,将1500rpm~2500rpm的区间确定为过渡区,在该过渡区内控制基波频率从300hz降到100hz,或者是从100hz上升到300hz。
在具体的实现上,加速工况和减速工况略有不同,以下分别说明。
针对加速工况,步骤V2具体可以有如下步骤:
步骤V2a:若预期转速不高于第二预设转速,则在加速工况下实时转速从0增加至预期转速,控制自加热电流值为第一电流值,且控制基波频率为第一频率。
由于电机实时转速低于第一预设转速,可能与第二频率存在某种数值关系,因此在电机实时转速低于第二预设转速时,控制基波频率为第一频率,而电机实时转速高于第二预设转速,可能与第一频率存在某种数值关系,因此在电机实时转速高于第二预设转速时,控制基波频率为第二频率。
因为控制基波频率的变化需要一定时长,因此在实时转速还没有高于第二预设转速时,就需要开始控制基波频率变化,而假若预期转速不高于第二预设转速,即电机实时转速最终是稳定在第二预设转速之下,那么就无需控制基波频率变化。因此首先需要判断预期转速与第二预设转速的大小关系。
若预期转速不高于第二预设转速,那么无需控制基波频率变化,仅需控制控制基波频率为第一频率,同时为了保证自加热的效率,控制自加热电流值为第一电流值。
沿用上述示例:假设预期转速为2450rpm,低于2500rpm,那么仅需控制控制基波频率为300hz,即可避免与实时转速存在某种数值关系。同时为了保证自加热的效率,控制自加热电流值为第一电流值,例如为540A。因此,在第二电机的实时转速从0升至2450rpm的整个过程中,控制自加热电流值为540A,控制自加热的基波频率为300hz,对动力电池进行加热。
步骤V2b1:若预期转速高于第二预设转速,则在加速工况下实时转速从0增加至低于第一预设转速的过程中,控制自加热电流值为第一电流值,且控制基波频率为所述第一频率;
步骤V2b2:在实时转速从第一预设转速增加至不高于第二预设转速的过程中,控制自加热电流值从第一电流值下降到第二电流值,且控制基波频率从第一频率下降到第二频率,第二电流值接近0或者等于0。
若是预期转速高于第二预设转速,那么就需要控制基波频率进行变化,为了保证自加热的效率,并兼顾实时转速低于第一预设转速下基波频率不能为第二频率的要求,以及降低基波频率对第二电机的冲击、对自加热电流的影响,因此在电机实时转速低于第一预设转速的过程中,以第一电流值、第一频率进行自加热,而在电机实时转速高于第一预设转速后,首先将自加热电流值降低至第二电流值,再开始控制基波频率从第一频率下降至第二频率,以在电机实时转速增加到第二预设转速之前,将基波频率降低为100hz,防止第二电机抖动。
沿用上述示例:假设预期转速为2550rpm,高于2500rpm,那么在第二电机的实时转速从0升至1500rpm的整个过程中,控制自加热电流值为540A,控制加热源的基波频率为300hz。当电机实时转速增加到1500rpm时,首先控制自加热电流值降低至接近0或者直接降低至0。再开始控制基波频率从300hz下降至100hz,以在电机实时转速增加到2500rpm之前,将基波频率降低至100hz。由于过渡区的转速均不与基波频率存在某种数值上的关系,因此无论是控制基波频率从300hz下降至100hz,还是控制基波频率从100hz上升至300hz,均不会导致第二电机抖动。
在控制自加热电流值从第一电流值下降到第二电流值,且控制基波频率从第一频率下降到第二频率之后,还有如下步骤:
步骤V2b3:确认是否收到稳定信号,所述稳定信号表征第二电机未产生来回震荡的扭矩脉冲纹波;
步骤V2b4:在收到稳定信号的情况下,控制自加热电流值从第二电流值上升到第一电流值,且保持基波频率为第二频率;
步骤V2b5:在未收到稳定信号的情况下,保持自加热电流值为第二电流值,且保持基波频率为第二频率,直至收到稳定信号后,控制自加热电流值从第二电流值上升到第一电流值,且保持基波频率为第二频率。
由于控制基波频率从第一频率下降到第二频率,实质上就是一个变频的过程,该变频的过程中,可能会对第二电机产生冲击,造成第二电机扭矩发生波动,也可能会使得第二电机发生抖动,但该抖动仅是变频过程中可能会出现,也可能不会出现,即使其出现抖动,相较于因基波频率与电机实时转速存在某种数值上的关系而产生的抖动,也小得多,因此可以忽略不计。
但需要在确定第二电机不抖动,处于稳定状态下,才可以将自加热电流值重新变回第一电流值。因此,在第二电机处于稳定状态下,会发送一个稳定信号给整车控制器,该稳定信号表征第二电机未产生来回震荡的扭矩脉冲纹波。当然,整车控制器也可以根据第二电机的扭矩数据是否波动,确定第二电机是否稳定。
在确定接收到稳定信号的情况下,即可控制自加热电流值从第二电流值上升到第一电流值,以保证自加热的效率,并且保持基波频率为第二频率。之后,无论电机实时转速是暂时还未达到2500rpm,还是高于2500rpm,均以第一电流值、第二频率进行自加热。
另外有一种可能,就是变频完成,但是第二电机状态稳定比较滞后,这种情况下不会接收到稳定信号,则继续保持自加热电流值为第二电流值,且保持基波频率为第二频率,直至收到稳定信号后,再控制自加热电流值从第二电流值上升到第一电流值,且保持基波频率为第二频率。
沿用上述示例:假设预期转速为2550rpm,高于2500rpm,那么在第二电机的实时转速从0升至1500rpm的整个过程中,控制自加热电流值为540A,控制自加热的基波频率为300hz。当电机实时转速增加到1500rpm时,首先控制自加热电流值降低至接近0或者直接降低至0。再开始控制基波频率从300hz
下降至100hz,以在电机实时转速增加到2500rpm之前,将基波频率降低至100hz。假设电机实时转速增加到2280rpm时,变频完成,且电机状态稳定,则接收到稳定信号,控制自加热电流值重新从接近0或者从0上升至540A,且继续保持加热源的基波频率为100hz,直至电机实时转速增加至2550rpm。假设电机实时转速增加到2280rpm时,变频完成,但电机状态不稳定,则不会接收到稳定信号,控制自加热电流值依旧为接近0或者为0,且继续保持自加热的基波频率为100hz,直至电机实时转速增加到2510rpm时,电机状态才稳定,接收到稳定信号,之后再控制自加热电流值重新从接近0或者从0上升至540A,且继续保持自加热的基波频率为100hz,直至电机实时转速增加至2550rpm。可以理解的是,极端情况下,可能电机实时转速增加至2550rpm时,还未接收到稳定信号,那么继续以电机实时转速2550rpm对应的车速行驶,且继续保持自加热的基波频率为100hz,等接收到稳定信号后,再控制自加热电流值重新从接近0或者从0上升至540A,且继续保持自加热的基波频率为100hz。
以上针对加速工况下如何抑制第二电机抖动进行了说明,类似于,针对减速工况,步骤V2具体可以有如下步骤:
步骤V2c:若预期转速高于第二预设转速,则在减速工况下实时转速降低至预期转速,控制自加热电流值为第一电流值,且控制基波频率为第二频率。
和加速工况类似的,若预期转速高于第二预设转速,那么无需控制基波频率变化,仅需控制控制基波频率为第二频率,同时为了保证自加热的效率,控制自加热电流值为第一电流值。
沿用上述示例:假设预期转速为2550rpm,高于2500rpm,那么仅需控制控制基波频率为100hz,即可避免与实时转速存在某种数值关系。同时控制自加热电流值为540A。因此,在第二电机的实时转速从当前转速降低至2550rpm的整个过程中,控制自加热电流值为540A,控制自加热的基波频率为100hz,对电池进行加热。
步骤V2d1:若预期转速不高于第二预设转速,则在减速工况下实时转速低于第二预设转速后,控制自加热电流值从第一电流值下降到第二电流值,且控制基波频率从第二频率上升到第一频率,第二电流值接近0或者等于0;
与加速工况略有不同,若是预期转速不高于第二预设转速,那么就需要控制基波频率进行变化,而在电机实时转速不高于第二预设转速时,即可将第二频率变化为第一频率,首先将自加热电流值降低至第二电流值,再开始控制基波频率从第二频率上升至第一频率,以在电机实时转速降低到第一预设转速之前,将基波频率升高为300hz,防止第二电机抖动。
沿用上述示例:假设预期转速为850rpm,远低于2500rpm,那么在第二电机的实时转速从当前转速降低至接近2500rpm的过程中,控制电池自加热的电流值为540A,控制加热源的基波频率为100hz。当电机实时转速降低到2500rpm时,首先控制自加热电流值降低至接近0或者直接降低至0。再开始控制基波频率从100hz上升至300hz,以在电机实时转速降低到1500rpm之前,将基波频率上升至300hz。
在控制自加热电流值从第一电流值下降到第二电流值,且控制基波频率从第二频率上升到第一频率之后,方法还包括如下步骤:
步骤V2d2:确认是否收到稳定信号;
步骤V2d3:在收到稳定信号的情况下,控制自加热电流值从第二电流值上升到第一电流值,且保持基波频率为第一频率;
步骤V2d4:在未收到稳定信号的情况下,保持自加热电流值为第二电流值,且保持基波频率为第一频率,直至收到稳定信号后,控制自加热电流值从第二电流值上升到第一电流值,且保持基波频率为第一频率。
在确定接收到稳定信号的情况下,即可控制自加热电流值从第二电流值上升到第一电流值,以保证自加热的效率,并且保持基波频率为第一频率。之后,无论电机实时转速是暂时还未达到1500rpm,还是低于1500rpm,均以第一电流值、第一频率进行自加热。
另外有一种可能,就是变频完成,但是第二电机状态稳定比较滞后,这种情况下不会接收到稳定信号,则继续保持自加热电流值为第二电流值,且保持基波频率为第一频率,直至收到稳定信号后,再控制电池自加热的电流值从第二电流值上升到第一电流值,且保持基波频率为第一频率。
沿用上述示例:假设预期转速为850rpm,那么在第二电机的实时转速从当前转速降低升接近2500rpm
的整个过程中,控制自加热电流值为540A,控制自加热的基波频率为100hz。当电机实时转速降低到2500rpm时,首先控制自加热电流值降低至接近0或者直接降低至0。再开始控制基波频率从100hz上升至300hz,以在电机实时转速降低到1500rpm之前,将基波频率上升至300hz。假设电机实时转速降低到2280rpm时,变频完成,且电机状态稳定,则接收到稳定信号,控制自加热电流值重新从接近0或者从0上升至540A,且继续保持自加热源基波频率为300hz,直至电机实时转速降低至850rpm。假设电机实时转速降低到2280rpm时,变频完成,但电机状态不稳定,则不会接收到稳定信号,控制自加热电流值依旧为接近0或者为0,且继续保持自加热的基波频率为300hz,直至电机实时转速降低到1800rpm时,电机状态才稳定,接收到稳定信号,之后再控制自加热电流值重新从接近0或者从0上升至540A,且继续保持自加热的基波频率为300hz,直至电机实时转速降低至850rpm。可以理解的是,极端情况下,可能电机实时转速降低至850rpm时,还未接收到稳定信号,那么继续以电机实时转速850rpm对应的车速行驶,且继续保持自加热的基波频率为300hz,等接收到稳定信号后,再控制自加热电流值重新从接近0或者从0上升至540A,且继续保持自加热的基波频率为300hz。
上述基波频率发生变频的情况,可以借助图3所示的转速-频率曲线图得到更直观的理解。X轴表示电机实时转速,Y轴表示基波频率,X1和X2分别表示第一预设转速和第二预设转速,Y1和Y0分别表示第一频率和第二频率。X1与X2之间有两条曲线,其中实线的曲线1表示加速工况下基波频率发生变频,点划线的曲线2表示减速工况下基波频率发生变频。图3仅是为了方便直观理解基波频率发生变频的情况,并不代表从第一频率变频至第二频率,或者从第二频率变频至第一频率时,对应的电机实际转速。参照前述说明,可以理解,变频完成仅需在X1~X2之间即可,并不限定具体在哪个电机实际转速时完成变频。
另外,需要说明的是,预设转速的确定还与电机的极对数有关,因为电机的极对数不同,其转速就不同。例如电机极对数为1,则根据我国通用工频50hz可以知晓,电机的转速为3000rpm。若电机极对数为2,则根据我国通用工频50hz可以知晓,电机的转速为1500rpm。若电机极对数为4,则根据我国通用工频50hz可以知晓,电机的转速为750rpm。那么当电机的转速不同时,自然其对应的敏感区不同,从而预设转速也就不同。但无论是哪种极对数的电机,都可以套用本公开的抑制电池自加热过程中整车震动的方法,达到消除第二电机的抖动的目的。
以上述抑制电池自加热过程中车辆震动的方法为基础,考虑到转速和频率之间具有关系,通过公式:n=60f/p(n表示转速、f表示频率、p表示极对数)即可进行简洁换算。车辆可以转速这个维度实现抑制电池自加热过程中车辆震动,也可以频率这个维度实现抑制电池自加热过程中车辆震动。
基于上述考虑,本公开实施例以频率这个维度为基础,还提出另一种抑制电池自加热过程中车辆震动的方法,参照图4,示出了本公开实施例另一种抑制电池自加热过程中车辆震动的方法的流程图,该方法同样应用于包括动力电池包、第一电机和第二电机的车辆,该方法包括:
步骤401:控制动力电池包向第一电机输出驱动电流以驱动第一电机转动,第一电机转动时拖曳第二电机转动;
步骤402:控制动力电池包向第二电机输出自加热电流以进行动力电池的自加热;
步骤403:获取第一电机的驱动电流基波频率;
步骤404:根据驱动电流基波频率,控制自加热电流基波频率,使自加热电流基波频率与驱动电流基波频率形成错峰。
在一些实施例中,步骤404:根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:
当所述驱动电流基波频率位于第一频率区间时,控制所述自加热电流基波频率位于第一频率;
当所述驱动电流基波频率位于第二频率区间时,控制所述自加热电流基本频率位于第二频率;其中,所述第二频率区间内的任意频率高于所述第一频率区间内的任意频率,所述第二频率小于所述第一频率。
在一些实施例中,步骤404:根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:
根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率
与所述驱动电流基波频率形成错峰,所述实时工况包括:加速工况或者减速工况。
在一些实施例中,根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:
根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;
根据所述预期转速确定对应于所述预期转速的预期频率;
根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率,包括:
若所述预期频率不高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第一频率;
若所述预期频率高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至低于所述第一预设频率的过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为所述第一频率;
在所述驱动电流基波频率从所述第一预设频率升高至所述预期频率的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0;
在一些实施例中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率之后,还包括:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率,包括:
若所述预期频率高于所述第二预设频率,则在减速工况下所述驱动电流基波频率降低至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第二频率;
若所述预期频率不高于所述第二预设频率,则在减速工况下所述驱动电流基波频率低于所述第二预设频率后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0;
在一些实施例中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率之后,还包括:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率。
该步骤401~步骤404的方法中,与前述步骤101~步骤104的方法区别在于获取的是第一电机的驱动电流基波频率,而第一电机的驱动电流基波频率可以根据第一电机的实时转速经简单运算得到。同理前述步骤中的第一转速区间、第二转速区间、预期转速、第一预设转速、第二预设转速同样可以运算得
到对应的第一频率区间、第二频率区间、预期频率、第一预设频率以及第二预设频率。其余的方法均相同,因此以频率维度为基础提出的抑制电池自加热过程中车辆震动的方法中,控制自加热电流基波频率(即相当于步骤101~步骤104的方法中自加热的基波频率)的具体方法参照前述步骤101~步骤104的方法即可,不做过多赘述。
综上所述,本公开提供的抑制电池自加热过程中车辆震动的方法,首先获取第一电机的实时转速或者驱动电流基波频率,之后根据实时转速或者驱动电流基波频率,控制自加热的基波频率变化,使得第二电机的实时转速或者驱动电流基波频率与自加热的基波频率两者之间始终不满足数值上的某种关系,即可消除第二电机的抖动,使得整车不会发生震动,提升乘客驾驶体验感的同时,还避免了损伤第二电机的使用寿命。
基于上述抑制电池自加热过程中车辆震动的方法,本公开实施例还提出一种抑制电池自加热过程中车辆震动的装置,参照图5,示出了本公开实施例一种抑制电池自加热过程中车辆震动的装置的框图,所述装置应用于包括动力电池包、第一电机和第二电机的车辆,所述装置包括:
控制转动模块510,用于控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;
控制自加热模块520,用于控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;
获取模块530,用于获取第一电机的实时转速;
控制频率模块540,用于根据所述实时转速控制自加热的基波频率,使所述基波频率与所述实时转速形成错峰。
在一些实施例中,所述控制频率模块540包括:
第一控制单元,用于当所述实时转速位于第一转速区间时,控制所述基波频率位于第一频率;
第二控制单元,用于当所述实时转速位于第二转速区间时,控制所述基本频率位于第二频率;其中,所述第二转速区间内的任意转速高于所述第一转速区间内的任意转速,所述第二频率小于所述第一频率。
在一些实施例中,所述控制频率模块540包括:
工况控制频率单元,用于根据所述实时转速和实时工况控制所述基波频率,使所述基波频率与所述实时转速形成错峰,所述实时工况包括:加速工况或者减速工况。
在一些实施例中,所述工况控制频率单元包括:
期望转速子单元,用于根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;
工况控制子单元,用于根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制自加热电流值和所述基波频率。
在一些实施例中,多个预设转速包括:第一预设转速、第二预设转速;
所述工况控制子单元具有用于:
若所述预期转速不高于所述第二预设转速,则在加速工况下所述实时转速升高至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第一频率;
若所述预期转速高于所述第二预设转速,则在加速工况下所述实时转速升高至低于所述第一预设转速的过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为所述第一频率;
在所述实时转速从所述第一预设转速升高至所述预期转速的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0。
在一些实施例中,所述工况控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率
为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率。
在一些实施例中,多个预设转速包括:第一预设转速、第二预设转速;
所述工况控制子单元还具体用于:
若所述预期转速高于所述第二预设转速,则在减速工况下所述实时转速降低至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第二频率;
若所述预期转速不高于所述第二预设转速,则在减速工况下所述实时转速低于所述第二预设转速后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0;
在一些实施例中,所述工况控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率。
对应上述步骤401~步骤404的方法,本公开实施例还提供另一种抑制电池自加热过程中车辆震动的装置,参照图6,示出了本公开实施例还提供另一种抑制电池自加热过程中车辆震动的装置的框图,所述装置应用于包括动力电池包、第一电机和第二电机的车辆,所述装置包括:
转动拖曳模块610,用于控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;
电流自加热模块620,用于控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;
获取驱动基波频率模块630,用于获取所述第一电机的驱动电流基波频率;
控制自加热基波频率模块640,用于根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰。
在一些实施例中,所述控制自加热基波频率模块640包括:
第一单元,用于当所述驱动电流基波频率位于第一频率区间时,控制所述自加热电流基波频率位于第一频率;
第二单元,用于当所述驱动电流基波频率位于第二频率区间时,控制所述自加热电流基本频率位于第二频率;其中,所述第二频率区间内的任意频率高于所述第一频率区间内的任意频率,所述第二频率小于所述第一频率。
在一些实施例中,所述控制自加热基波频率模块640包括:
频率错峰控制单元,用于根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,所述实时工况包括:加速工况或者减速工况。
在一些实施例中,所述频率错峰控制单元包括:
工况预期转速子单元,用于根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;
确定预期频率子单元,用于根据所述预期转速确定对应于所述预期转速的预期频率;
频率错峰控制子单元,用于根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
所述频率错峰控制子单元具体用于:
若所述预期频率不高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至所述预期
频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第一频率;
若所述预期频率高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至低于所述第一预设频率的过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为所述第一频率;
在所述驱动电流基波频率从所述第一预设频率升高至所述预期频率的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0;
在一些实施例中,所述频率错峰控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率。
在一些实施例中,多个预设频率包括:第一预设频率、第二预设频率;
所述频率错峰控制子单元还具体用于:
若所述预期频率高于所述第二预设频率,则在减速工况下所述驱动电流基波频率降低至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第二频率;
若所述预期频率不高于所述第二预设频率,则在减速工况下所述驱动电流基波频率低于所述第二预设频率后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0;
在一些实施例中,所述频率错峰控制子单元还具体用于:
确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;
在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率;
在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率。
基于上述抑制电池自加热过程中车辆震动的方法,本公开实施例还提出一种汽车,所述汽车包括:控制器,所述控制器用于执行上述步骤101~步骤104任一所述的抑制电池自加热过程中整车震动的方法;或者,所述控制器用于执行上述步骤401~步骤404任一所述的抑制电池自加热过程中车辆震动的方法。
还需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法所固有的要素。
上面结合附图对本公开的实施例进行了描述,但是本公开并不局限于上述的具体实施方式,上述的具体实施方式仅仅是示意性的,而不是限制性的,本领域的普通技术人员在本公开的启示下,在不脱离本公开宗旨和权利要求所保护的范围情况下,还可做出很多形式,这些均属于本公开的保护之内。
Claims (21)
- 一种抑制电池自加热过程中车辆震动的方法,其特征在于,所述方法应用于包括动力电池包、第一电机和第二电机的车辆,所述方法包括:控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;获取第一电机的实时转速;根据所述实时转速控制自加热电流的基波频率,使所述基波频率与所述实时转速形成错峰。
- 根据权利要求1所述的方法,其特征在于,所述根据所述实时转速控制自加热的基波频率,使所述基波频率与所述实时转速形成错峰,包括:当所述实时转速位于第一转速区间时,控制所述基波频率位于第一频率;当所述实时转速位于第二转速区间时,控制所述基波频率位于第二频率;其中,所述第二转速区间内的任意转速高于所述第一转速区间内的任意转速,所述第二频率小于所述第一频率。
- 根据权利要求1或2所述的方法,其特征在于,所述根据所述实时转速控制自加热的基波频率,使所述基波频率与所述实时转速形成错峰,包括:根据所述实时转速和实时工况控制所述基波频率,使所述基波频率与所述实时转速形成错峰,所述实时工况包括:加速工况或者减速工况。
- 根据权利要求3所述的方法,其特征在于,所述根据所述实时转速和实时工况控制所述基波频率,使所述基波频率与所述实时转速形成错峰,包括:根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制自加热电流值和所述基波频率。
- 根据权利要求4所述的方法,其特征在于,多个预设转速包括:第一预设转速、第二预设转速;所述根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制自加热电流值和所述基波频率,包括:若所述预期转速不高于所述第二预设转速,则在加速工况下所述实时转速升高至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第一频率;若所述预期转速高于所述第二预设转速,则在加速工况下所述实时转速升高至低于所述第一预设转速的过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为所述第一频率;在所述实时转速从所述第一预设转速升高至所述预期转速的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0。
- 根据权利要求5所述的方法,其特征在于,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第一频率下降到第二频率之后,还包括:确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率;在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第二频率。
- 根据权利要求4-6中任一项所述的方法,其特征在于,多个预设转速包括:第一预设转速、第二预设转速;所述根据所述预期转速与多个预设转速的大小关系,以及所述实时转速与所述多个预设转速的大小关系,结合所述实时工况,控制所述自加热电流值和所述基波频率,包括:若所述预期转速高于所述第二预设转速,则在减速工况下所述实时转速降低至所述预期转速过程中,控制所述自加热电流值为第一电流值,且控制所述基波频率为第二频率;若所述预期转速不高于所述第二预设转速,则在减速工况下所述实时转速低于所述第二预设转速后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0。
- 根据权利要求7所述的方法,其特征在于,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述基波频率从所述第二频率上升到第一频率之后,还包括:确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率;在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述基波频率为所述第一频率。
- 根据权利要求5-8中任一所述的方法,其特征在于,所述第一预设转速和所述第二预设转速的取值,由所述第一频率、所述第二频率以及电机极对数决定。
- 根据权利要求1-9任一项所述的方法,其特征在于,所述第一电机为同步电机或异步电机,所述第二电机为异步电机。
- 一种抑制电池自加热过程中车辆震动的方法,其特征在于,所述方法应用于包括动力电池包、第一电机和第二电机的车辆,所述方法包括:控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;获取所述第一电机的驱动电流基波频率;根据所述驱动电流基波频率控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰。
- 根据权利要求11所述的方法,其特征在于,所述根据所述驱动电流基波频率控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:当所述驱动电流基波频率位于第一频率区间时,控制所述自加热电流基波频率位于第一频率;当所述驱动电流基波频率位于第二频率区间时,控制所述自加热电流基本频率位于第二频率;其中,所述第二频率区间内的任意频率高于所述第一频率区间内的任意频率,所述第二频率小于所述第一频率。
- 根据权利要求11或12所述的方法,其特征在于,所述根据所述驱动电流基波频率控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,所述实时工况包括:加速工况或者减速工况。
- 根据权利要求13所述的方法,其特征在于,所述根据所述驱动电流基波频率和实时工况控制所述自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰,包括:根据所述加速工况下加速踏板的踩踏程度或者所述减速工况下减速踏板的踩踏程度,确定预期转速,所述预期转速表征驾驶员期望达到的车速对应的电机转速;根据所述预期转速确定对应于所述预期转速的预期频率;根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率。
- 根据权利要求14所述的方法,其特征在于,多个预设频率包括:第一预设频率、第二预设频率;所述根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率,包括:若所述预期频率不高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第一频率;若所述预期频率高于所述第二预设频率,则在加速工况下所述驱动电流基波频率升高至低于所述第一预设频率的过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为所述第一频率;在所述驱动电流基波频率从所述第一预设频率升高至所述预期频率的过程中,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率,所述第二电流值接近0或者等于0。
- 根据权利要求15所述的方法,其特征在于,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第一频率下降到第二频率之后,还包括:确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率;在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第二频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第二频率。
- 根据权利要求14-16中任一项所述的方法,其特征在于,多个预设频率包括:第一预设频率、第二预设频率;所述根据所述预期频率与多个预设频率的大小关系,以及所述驱动电流基波频率与所述多个预设频率的大小关系,结合所述实时工况,控制自加热电流值和所述自加热电流基波频率,包括:若所述预期频率高于所述第二预设频率,则在减速工况下所述驱动电流基波频率降低至所述预期频率过程中,控制所述自加热电流值为第一电流值,且控制所述自加热电流基波频率为第二频率;若所述预期频率不高于所述第二预设频率,则在减速工况下所述驱动电流基波频率低于所述第二预设频率后,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率,所述第二电流值接近0或者等于0。
- 根据权利要求17所述的方法,其特征在于,控制所述自加热电流值从所述第一电流值下降到第二电流值,且控制所述自加热电流基波频率从所述第二频率上升到第一频率之后,还包括:确认是否收到稳定信号,所述稳定信号表征所述第二电机未产生来回震荡的扭矩脉冲纹波;在收到所述稳定信号的情况下,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率;在未收到所述稳定信号的情况下,保持所述自加热电流值为所述第二电流值,且保持所述自加热电流基波频率为所述第一频率,直至收到所述稳定信号后,控制所述自加热电流值从所述第二电流值上升到所述第一电流值,且保持所述自加热电流基波频率为所述第一频率。
- 一种抑制电池自加热过程中车辆震动的装置,其特征在于,所述装置应用于包括动力电池包、第一电机和第二电机的车辆,所述装置包括:控制转动模块,用于控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;控制自加热模块,用于控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;获取模块,用于获取第一电机的实时转速;控制频率模块,用于根据所述实时转速控制自加热的基波频率,使所述基波频率与所述实时转速形成错峰。
- 一种抑制电池自加热过程中车辆震动的装置,其特征在于,所述装置应用于包括动力电池包、第一电机和第二电机的车辆,所述装置包括:转动拖曳模块,用于控制所述动力电池包向第一电机输出驱动电流以驱动所述第一电机转动,所述第一电机转动时拖曳所述第二电机转动;电流自加热模块,用于控制所述动力电池包向所述第二电机输出自加热电流以进行动力电池的自加热;获取驱动基波频率模块,用于获取所述第一电机的驱动电流基波频率;控制自加热基波频率模块,用于根据所述驱动电流基波频率,控制自加热电流基波频率,使所述自加热电流基波频率与所述驱动电流基波频率形成错峰。
- 一种汽车,其特征在于,所述汽车包括:控制器,所述控制器用于执行如权利要求1-9任一所述的抑制电池自加热过程中车辆震动的方法;或者,所述控制器用于执行如权利要求11-18任一所述的抑制电池自加热过程中车辆震动的方法。
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