CN115871520A - Method and device for controlling heating of an electric drive system of a vehicle, system, vehicle and medium - Google Patents

Abstract

The invention discloses a method and a device for controlling heating of a vehicle electric driving system, a vehicle and a medium, wherein the vehicle electric driving system comprises a motor controller and a motor, and the method for controlling the heating of the vehicle electric driving system comprises the following steps: detecting that the vehicle is in a parking state and determining that the motor is in a static state; responsive to the heating command, obtaining an electric drive-low efficiency heating control parameter, wherein the electric drive-low efficiency heating control parameter comprises at least one of a current comprising a non-zero d-axis current and a carrier frequency greater than the carrier frequency in a vehicle normal drive mode; obtaining a control signal for driving a motor controller according to the electric driving low efficiency heating control parameter; the motor is controlled to operate in a low efficiency mode based on the control signal such that the electric drive system generates heat. The method for controlling the heating of the vehicle electric drive system can realize that the drive system is charged into the power battery for heating, does not need to be provided with independent heating equipment, saves the cost and can improve the efficiency of heating the power battery.

Description

Method and device for controlling heating of electric drive system of vehicle, system, vehicle and medium

Technical Field

The invention relates to the technical field of vehicles, in particular to a method and a device for controlling heating of a vehicle electric drive system, a heating system, a vehicle and a storage medium.

Background

The electric automobile is developed rapidly, and the application scenes are wide, so that the power battery needs to adapt to temperature changes in different regions. However, the power battery loaded on the electric vehicle cannot be charged and discharged with high power in a low-temperature environment, so that the capability of the driving system or the charging system in the low-temperature environment is limited, sufficient power cannot be rapidly provided, and normal use of a user is affected. In some prior art, independent heating equipment such as a PTC heater is arranged in an electric vehicle, and the heating equipment heats a liquid medium in a heat dissipation device to provide heat for a power battery, so that the battery is rapidly heated to reach a normal working temperature range, and the driving capability of a driving system of the electric vehicle or the charging capability of a charging system is guaranteed.

In the prior art, when an independent heating device is adopted for heating a power battery or the interior of a carriage, the heating efficiency is low, energy is not saved, the cost of parts is high, the parts are limited by the volume space of a vehicle, and the installation mode is not flexible.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. One of the objects of the invention is to provide a method for controlling the heating of an electric drive system of a vehicle, which makes it possible to heat a power battery by charging the electric drive system, which saves costs without the need for a separate heating device, and which makes it possible to increase the efficiency of the heating of the power battery.

Another object of the present invention is to provide an apparatus for controlling heating of an electric drive system for a vehicle.

It is a further object of the present invention to provide a vehicle heating system.

It is a fourth object of the present invention to provide a computer readable storage medium.

The fifth purpose of the invention is to provide a vehicle.

To achieve the above object, a first aspect of the present invention provides a method for controlling heating of an electric drive system for a vehicle, the electric drive system including a motor controller and an electric motor, the method comprising: detecting that a vehicle is in a parking state and determining that the motor is in a stationary state; responsive to a heating command, obtaining an electric drive-low efficiency heating control parameter, wherein the electric drive-low efficiency heating control parameter comprises at least one of a current comprising a non-zero d-axis current and a carrier frequency that is greater than the carrier frequency in a vehicle normal drive mode; obtaining a control signal for driving the motor controller according to the electrical drive-by-wire heating control parameter; and controlling the motor to operate in a low-efficiency mode according to the control signal so that the electric drive system generates heat.

According to the method for controlling the heating of the vehicle electric drive system, under the condition that the vehicle is in the parking state and the motor is in the static state, when the heating requirement exists in the power battery, the electric drive low-efficiency heating control parameter is obtained, wherein the electric drive low-efficiency heating control parameter comprises non-zero d-axis current and/or carrier frequency which is larger than the carrier frequency in the conventional driving mode, namely the electric drive system is controlled to operate in the low-efficiency mode in the parking state, a large amount of heat can be generated, the heating requirement on the power battery is met, no additional heating equipment is needed, and the heating efficiency of the power battery is improved.

In some embodiments of the invention, the electrically driven inefficient heating control parameter comprises a current, the d-axis current being either a positive or negative value, or the d-axis current being a pulsed current alternating positive and negative according to a predetermined alternating time.

In some embodiments of the invention, the current further comprises a q-axis current that is zero or a current near zero.

In some embodiments of the invention, deriving the control signal to drive the motor controller based on the electrical drive-inefficient heating control parameter comprises: converting the d-axis current and the q-axis current to obtain a three-phase driving voltage signal; and performing pulse width modulation on the three-phase driving voltage signal according to the carrier frequency to obtain a pulse width modulation signal for driving the motor controller.

In some embodiments of the present invention, detecting that the vehicle is in a parked state and determining that the motor is in a stationary state comprises: and detecting that the vehicle is in an N gear or a P gear, and determining that the rotating speed of the motor is less than a preset rotating speed.

In some embodiments of the invention, the method further comprises: determining that the rotating speed of the motor is greater than or equal to the preset rotating speed; waiting for a preset time length; and determining that the rotating speed of the motor is still greater than or equal to the preset rotating speed, and performing fault alarm.

In order to achieve the above object, an embodiment of the second aspect of the present invention provides an apparatus for controlling heating of an electric drive system of a vehicle, comprising: the detection module is used for detecting that the vehicle is in a parking state and determining that the motor is in a static state; a parameter acquisition module for acquiring an electric drive-low efficiency heating control parameter in response to a heating command, wherein the electric drive-low efficiency heating control parameter comprises at least one of a current comprising a non-zero d-axis current and a carrier frequency greater than the carrier frequency in a vehicle normal drive mode; the control signal acquisition module is used for acquiring a control signal for driving a motor controller according to the electric driving low-efficiency heating control parameter; and the control module is used for controlling the motor to operate in the low-efficiency mode according to the control signal so as to enable the electric drive system to generate heat.

According to the device for controlling the vehicle electric driving system to heat, based on the framework of the detection module, the parameter acquisition module, the control signal acquisition module and the control module, under the working condition of parking of the vehicle, when the power battery has a heating requirement, the device for controlling the vehicle electric driving system to heat controls the non-zero output of the d-axis current and/or controls the carrier frequency to be larger than the carrier frequency in the conventional driving mode of the vehicle according to the heating instruction, so that the control signal for driving the motor controller is obtained, the motor is controlled to operate in the low-efficiency mode according to the control signal, the electric energy is converted into heat energy to heat the power battery, and the function of heating the power battery can be realized without external heating equipment. The cost of parts is saved, the volume space is saved, the installation mode is more flexible, and the efficiency of heating the power battery can be improved.

In order to achieve the above object, a vehicle heating system according to an embodiment of a third aspect of the present invention includes: an electric drive system including a motor controller and a motor; a heat exchange system for absorbing heat generated by the electric drive system; -an electric drive control device connected to the electric drive system for controlling the electric drive system for a vehicle according to the method for controlling heating of the electric drive system for a vehicle as defined in any of the above embodiments for generating heat.

According to the vehicle heating system provided by the embodiment of the invention, based on the original structures of the electric drive system and the heat exchange system, the electric drive control device is arranged, under the working condition of parking of the vehicle, the motor controller and the motor electric drive system are controlled to operate in the low-efficiency mode, the electric drive system operates in the high-loss state to generate a large amount of heat, the heat consumption of the electric drive system is heat of a heat dissipation medium in the electric drive system, the heat dissipation medium exchanges heat with the heat exchange system, and the heat exchange system can acquire the heat generated by the electric drive system to heat a power battery. This vehicle heating system need not external firing equipment, saves spare part cost, saves volume space and the mounting means is more nimble, can also improve the efficiency for power battery's heating.

In order to achieve the above object, a fourth aspect of the invention proposes a computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed, implements the method of controlling heating of an electric drive system of a vehicle as set forth in any of the above embodiments.

According to the computer readable storage medium of the embodiment of the invention, the computer program is stored on the computer readable storage medium, when the computer program runs, the running parameters of each structure in the vehicle heating system can be obtained for analysis and calculation, under the vehicle parking condition, the electric drive system is controlled to run in a high loss state to generate a large amount of heat, the power battery is heated by using the heat consumption of the electric drive system, so that the method for controlling the vehicle electric drive system to heat can be directly applied to the existing vehicle, the running states and parameters of each part of the vehicle and the like have memory, an external heating device is not needed, the cost of parts and components is saved, the volume and space are saved, the installation mode is more flexible, and the heating efficiency of the power battery can be improved.

In order to achieve the above object, an embodiment of a fifth aspect of the invention proposes a vehicle including: a power cell; the vehicle controller is used for sending a heating instruction when the power battery is determined to have a heating demand; the vehicle heating system according to the embodiment of the third aspect described above, being connected to the vehicle controller, configured to heat the power battery in response to the heating instruction.

According to the vehicle provided by the embodiment of the invention, under the parking working condition of the vehicle, the vehicle controller detects that the power battery needs to be heated and sends a heating instruction to the vehicle heating system, the motor controller controls the motor to operate in a low-efficiency mode, electric energy is converted into heat energy to heat the power battery, the power battery is heated by the heat consumption of the electric driving system, the vehicle can be directly realized in the conventional hardware equipment, external heating equipment is not needed, the part cost is saved, the volume space is saved, the installation mode is more flexible, and the efficiency of heating the power battery can be improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a flow chart of a method of controlling heating of an electric drive system for a vehicle in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram of carrier frequency versus time for one embodiment of the present invention;

FIG. 3 is a schematic diagram of the relationship between the positive value id _1 and the time of the d-axis current according to one embodiment of the present invention;

FIG. 4 is a graph illustrating a negative value id _2 of d-axis current versus time according to an embodiment of the present invention;

FIG. 5 is a schematic of a pulse current with alternating positive and negative d-axis currents versus time for one embodiment of the present invention;

FIG. 6 is a flow chart of a method of controlling heating of an electric drive system for a vehicle in accordance with another embodiment of the present invention;

FIG. 7 is a flow chart of a method of controlling heating of an electric drive system for a vehicle according to yet another embodiment of the present invention;

FIG. 8 is a flow chart of a method of controlling heating of an electric drive system for a vehicle in accordance with yet another embodiment of the present invention;

FIG. 9 is a block diagram of an apparatus for controlling heating of an electric drive system for a vehicle according to one embodiment of the present invention;

FIG. 10 is a block diagram of a vehicle heating system in accordance with one embodiment of the present invention;

FIG. 11 is a schematic view of a vehicle heating system of one embodiment of the present invention;

fig. 12 is a block diagram of a vehicle according to an embodiment of the invention.

Reference numerals are as follows:

a device 100 for controlling the heating of an electric drive system of a vehicle;

the device comprises a detection module 101, a parameter acquisition module 102, a control signal acquisition module 103 and a control module 104;

a vehicle 10;

a vehicle heating system 1, a power battery 2, a vehicle controller 3;

an electric drive system 11, a heat exchange system 12, an electric drive control device 13;

a motor controller 111, a motor 112;

switch tube T1, switch tube T2, switch tube T3, switch tube T4, switch tube T5, switch tube T6, electric capacity C1, switch unit S, power U.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

A method of controlling heating of an electric drive system for a vehicle according to an embodiment of the invention is described below with reference to fig. 1-8.

In some embodiments of the invention, as shown in fig. 1, a flow chart of a method for controlling heating of a vehicle electric drive system according to one embodiment of the invention is shown, wherein the electric drive system comprises a motor controller and an electric motor, and the method for controlling heating of the vehicle electric drive system comprises at least steps S1-S4, in particular as follows.

S1, detecting that the vehicle is in a parking state and determining that the motor is in a static state.

In an embodiment, the vehicle operating state and the engine operating state may be determined by detecting a vehicle gear signal and a motor speed signal.

Specifically, if it is detected that the vehicle is in the N-range or the P-range, it is determined that the vehicle is in the parking state, and it is determined that the rotation speed of the motor is less than a preset rotation speed, where the preset rotation speed may be set according to an actual test condition, for example, the preset rotation speed may be set to ± 100rpm. That is, when it is determined from the acquired motor speed signal that the motor speed is within a speed range of ± 100rpm, it is determined that the motor is in a stationary state.

And S2, responding to the heating command, acquiring an electric driving low-efficiency heating control parameter, wherein the electric driving low-efficiency heating control parameter comprises at least one of current and carrier frequency, the current comprises non-zero d-axis current, and the carrier frequency is larger than the carrier frequency in the conventional driving mode of the vehicle.

Specifically, when the power Battery needs to be heated after the Vehicle is parked, a host computer such as a BMS (Battery Management System) or a VCU (Vehicle Control Unit) sends a heating command to the electric drive System, and the electric drive System acquires an electric drive low-efficiency heating Control parameter in response to the heating command, wherein the electric drive low-efficiency heating Control parameter may include a current and/or a carrier frequency.

The current comprises non-zero d-axis current, in the prior art, the d-axis current of the vehicle is zero in a parking mode, and under the parking working condition, the electric driving system is controlled to operate in a low-efficiency mode with high energy consumption by controlling the d-axis current to be non-zero, so that a large amount of heat is generated, and the power battery is heated.

In some embodiments of the present invention, the electric drive inefficiency heating control parameter may further include a carrier frequency, the carrier frequency in the electric machine operation inefficiency mode being greater than the carrier frequency in the vehicle normal drive mode. Wherein the carrier frequency is the carrier wave command. The carrier frequency in the normal driving mode of the vehicle is 5Hz, for example, after the motor operates in the low-efficiency mode, the switching frequency of the switching tube in the motor controller can be increased appropriately to adjust the carrier frequency higher, for example, the carrier frequency can be increased from 5Hz to 15Hz. Referring to fig. 2, a carrier frequency versus time diagram is shown, wherein fpwm _1 represents the carrier frequency in the normal driving mode of the vehicle, fpwm _2 represents the carrier frequency in the motor operating inefficient mode, and fpwm _2 in the motor operating inefficient mode can be set according to practical tests, and the carrier frequency fpwm _2 in the motor operating inefficient mode is greater than the carrier frequency fpwm _1 in the normal driving mode of the vehicle.

In some embodiments of the present invention, the electrical drive-low efficiency heating control parameter may include only current, or may include both current and carrier frequency. That is, in the motor operation inefficiency mode, the electric drive inefficiency heating control parameter can be set as required, for example, the control current is output alone or the control current and the carrier frequency are output in combination, so as to achieve a better heating effect.

And S3, obtaining a control signal for driving the motor controller according to the electric driving low-efficiency heating control parameter.

Specifically, the current may be converted to obtain a three-phase drive voltage signal. And then the three-phase driving voltage signal is subjected to pulse width modulation according to the carrier frequency to obtain a pulse width modulation signal for driving the motor controller, and the pulse width modulation signal is transmitted to the motor controller.

And S4, controlling the motor to operate in a low-efficiency mode according to the control signal so that the electric drive system generates heat.

Wherein, the motor can be the three-phase motor, and after motor controller received control signal, this signal driving motor operation inefficiency mode was responded to, and during the motor operation inefficiency mode, the electric drive system was in the high loss state, can release a large amount of heats, released the radiating medium among the heat heating system, and then converted this heat into the required heat of vehicle. Under the parking operating mode, when power battery had the heating demand, the control motor operation inefficiency mode, directly by the heat that the electricity system of driving charges and produce for power battery heating, heat transfer efficiency is higher, can make power battery rapid heating up, reaches the temperature interval of normal work.

According to the method for controlling the heating of the vehicle electric drive system, under the condition that the vehicle is in the parking state and the motor is in the static state, when the heating requirement exists in the power battery, the electric drive low-efficiency heating control parameter is obtained, wherein the electric drive low-efficiency heating control parameter comprises non-zero d-axis current and/or carrier frequency which is larger than the carrier frequency in the conventional driving mode, namely the electric drive system is controlled to operate in the low-efficiency mode in the parking state, a large amount of heat can be generated, the heating requirement on the power battery is met, no additional heating equipment is needed, and the heating efficiency of the power battery is improved.

In some embodiments of the present invention, the d-axis current is a positive or negative value, or alternatively, the d-axis current is a pulsed current that alternates positive and negative according to a preset alternating time. Under the working condition of parking of the vehicle, the d-axis current is controlled to be nonzero, so that the electric drive system is controlled to operate in a low-efficiency mode with high energy consumption, a large amount of heat is generated, and the power battery is heated. In an embodiment, d-axis current is the key current command, where positive d-axis current values are denoted by id _1 and negative d-axis current values are denoted by id _ 2.

For example, the d-axis current may be always a positive value id _1, and the positive value id _1 may be set according to an actual test, which is required to ensure that the motor does not shake. Fig. 3 is a schematic diagram of a relationship between a positive value id _1 and time of a d-axis current according to an embodiment of the invention, wherein the positive value id _1 of the output current is kept unchanged with time when the d-axis current is the positive value id _1.

For another example, the d-axis current may be always a negative value id _2, and the negative value id _2 may be set according to an actual test, which is required to ensure that the motor does not shake. Fig. 4 is a schematic diagram illustrating the relationship between the negative value id _2 and the time of the d-axis current according to an embodiment of the invention, wherein the negative value id _2 of the output current is kept unchanged with time when the d-axis current is the negative value id _ 2.

For another example, the d-axis current may be a pulse current that alternates positive and negative according to a preset alternating time. The alternating time is represented by ts, the positive value id _1, the negative value id _2 and the alternating time ts can be set according to actual tests, and the phenomenon that the motor does not shake needs to be guaranteed. As shown in fig. 5, which is a schematic diagram of the relationship between pulse current and time in which the d-axis current is positive and negative alternately, according to an embodiment of the present invention, a positive value id _1 and a negative value id _2 are output according to a certain alternating time ts.

In some embodiments of the present invention, the q-axis current of the currents is a zero value or a current close to a zero value. The q-axis current is an assist current command, and the current value of the q-axis current in the current is small, for example, the current value of the q-axis current is 0A or is close to OA, that is, the current may include only the d-axis current and may also include the d-axis current and the q-axis current.

In some embodiments of the present invention, as shown in fig. 6, which is a flowchart of a method of controlling heating of an electric drive system of a vehicle according to yet another embodiment of the present invention, wherein a control signal for driving a motor controller is obtained according to an electric drive low efficiency heating control parameter, i.e., step S3 above includes steps S31 and S32, as follows.

And S31, converting the d-axis current and the q-axis current to obtain three-phase driving voltage signals.

Wherein, the motor can include three-phase motor, and three-phase drive voltage signal suits with three-phase motor. The q-axis current of the currents has a small current value, for example, the q-axis current has a current value of 0A or a current value close to OA, that is, only the d-axis current may be converted, or the d-axis current and the q-axis current may be converted to obtain a three-phase driving voltage signal.

And S32, performing pulse width modulation on the three-phase driving voltage signal according to the carrier frequency to obtain a pulse width modulation signal for driving the motor controller.

In an embodiment, the motor controller is configured to control an operating state of the motor, taking a three-phase motor as an example, the motor controller may include six switching tubes, which are respectively configured to control the operating state of the three-phase motor, the switching frequency of the switching tubes in the motor controller may be appropriately increased to increase the carrier frequency, and the three-phase driving voltage signal may be frequency-modulated according to the carrier frequency to obtain a pulse width modulation signal for driving the motor controller, where the carrier frequency in this mode is greater than the carrier frequency in the normal driving mode of the vehicle. The pulse width modulation signal can be a six-path tuning signal and is used for controlling the conduction states of six switching tubes in the motor controller and outputting the combination of current and carrier frequency to the motor controller so as to control the motor to achieve a better heating state.

In some embodiments of the invention, as shown in fig. 7, a flow chart of a method of controlling heating of an electric drive system of a vehicle according to yet another embodiment of the invention is shown, wherein the method of controlling heating of the electric drive system of the vehicle further comprises steps S5-S7, as follows.

And S5, determining that the rotating speed of the motor is greater than or equal to a preset rotating speed.

When the vehicle is in a parking state, the rotating speed of the motor is determined to be greater than or equal to a preset rotating speed according to the collected motor rotating speed signal, the rotating speed of the motor is not reduced to the preset rotating speed range at the moment, the motor is determined to be in a non-static state, and the motor operation low-efficiency mode cannot be controlled.

And S6, waiting for a preset time length. The preset duration can be set according to an actual test condition, for example, the preset duration can be set to be 30s, 1min, 2min or 3 min. In an embodiment, after waiting for a preset duration, the motor speed signal needs to be acquired again, and the acquired motor speed value is compared with the preset speed.

And S7, determining that the rotating speed of the motor is still greater than or equal to the preset rotating speed, and performing fault alarm.

And determining that the rotating speed of the motor is still greater than or equal to the preset rotating speed according to the obtained motor rotating speed signal, indicating that the motor is still in a non-static state, and then the motor cannot run in a low-efficiency mode, and the system gives a fault alarm. For example, a display device such as an instrument panel can be used for displaying characters or fault codes and carrying out voice reminding, or fault information can be sent to a mobile terminal of a user so as to remotely remind the user of fault conditions.

In some embodiments of the invention, as shown in fig. 8, a flow chart of a method for controlling heating of a vehicle electric drive system according to a further embodiment of the invention is shown, wherein the method for controlling heating of the vehicle electric drive system comprises steps S101-S110, which are as follows.

S101, a vehicle stop state.

S102, a heating instruction is detected.

And S103, judging whether the rotating speed of the motor is less than the preset rotating speed, if so, executing a step S104, and if not, executing a step S106.

And S104, judging whether the vehicle gear is in a P gear or an N gear, if so, executing a step S105, and if not, executing a step S108.

And S105, controlling the motor to operate in a low-efficiency mode.

S106, waiting.

S107, judging whether the waiting time is longer than a first preset time, if so, quitting and performing fault alarm, and if not, executing the step S104. The first preset time length can be set according to the actual test condition.

S108, waiting.

S109, judging whether the waiting time is longer than a second preset time, if yes, quitting and performing fault alarm, and if no, executing the step S105. The second preset time length can be set according to the actual test condition.

According to the method for controlling the heating of the vehicle electric driving system, when the condition that the vehicle is in the parking state and the condition that the motor is in the static state are met, the motor is controlled to operate in the low-efficiency mode, electric energy is converted into heat energy to heat the power battery, and therefore the heating function of the power battery under the parking working condition of the vehicle is achieved.

In some embodiments of the invention, as shown in fig. 9, a block diagram of an apparatus for controlling heating of a vehicle electric drive system 100 according to one embodiment of the invention is shown, wherein the apparatus comprises a detection module 101, a parameter obtaining module 102, a control signal obtaining module 103 and a control module 104.

The detection module 101 is configured to detect that the vehicle is in a parking state and determine that the motor is in a stationary state. The detection module 101 may acquire a vehicle gear signal and a motor speed signal, determine that the vehicle is in a parking state when it is determined that the vehicle is in an N gear or a P gear according to the acquired vehicle gear signal, and determine that the motor is in a stationary state when it is determined that the motor speed is within a set speed range according to the acquired motor speed signal.

The parameter acquisition module 102 is configured to acquire an electric drive-low efficiency heating control parameter in response to the heating command, wherein the electric drive-low efficiency heating control parameter includes at least one of a current including a non-zero d-axis current and a carrier frequency greater than the carrier frequency in a normal drive mode of the vehicle.

Under the parking operating mode, when power battery has the heating demand, the host computer sends out the heating instruction like BMS or VCU etc. and parameter acquisition module 102 responds to the heating instruction, through the nonzero output of control d axle electric current to control carrier frequency and be greater than the carrier frequency under the vehicle conventional drive mode, control motor operation, and then control electric drive system and operate in the low efficiency mode of high energy consumption, produce a large amount of heats, thereby realize heating power battery.

The control signal deriving module 103 is configured to derive a control signal for driving the motor controller based on the electrical drive inefficiency heating control parameter. The control signal obtaining module 103 may convert the d-axis current and the q-axis current to obtain a three-phase driving voltage signal, and perform pulse width modulation on the three-phase driving voltage signal according to a carrier frequency to obtain a pulse width modulation signal for driving the motor controller.

The control module 104 is configured to control the electric machine to operate in a low efficiency mode based on the control signal to cause the electric drive system to generate heat.

Specifically, the control module 104 controls the motor to operate according to the control signal, and when the motor operates in the low-efficiency mode, the heat is released to heat the heat dissipation medium, so that the heat is converted into heat required by the vehicle. Under the parking working condition, when the power battery has a heating requirement, the electric drive system directly runs in a low-efficiency mode with high energy consumption to generate heat to heat the power battery, and the rapid temperature rise of the power battery is realized.

According to the device 100 for controlling the heating of the vehicle electric driving system, based on the framework of the detection module 101, the parameter acquisition module 102, the control signal acquisition module 103 and the control module 104, under the parking condition of the vehicle, when the power battery has a heating demand, the device 100 for controlling the heating of the vehicle electric driving system controls the non-zero output of the d-axis current and/or controls the carrier frequency to be greater than the carrier frequency in the conventional driving mode of the vehicle according to the heating instruction, so as to further obtain the control signal for driving the motor controller, and controls the motor to operate in the low-efficiency mode according to the control signal, so that the electric energy is converted into heat energy to heat the power battery, and the function of heating the power battery can be realized without external heating equipment. The cost of parts is saved, the volume space is saved, the installation mode is more flexible, and the efficiency of heating the power battery can be improved.

In some embodiments of the present invention, as shown in fig. 10, which is a block diagram of a vehicle heating system according to one embodiment of the present invention, the vehicle heating system 1 comprises an electric drive system 11, a heat exchange system 12 and an electric drive control device 13, wherein the electric drive system 11 comprises a motor controller 111 and an electric motor 112.

Wherein the electric drive control device 13 is connected to the electric drive system 11 for controlling the electric drive system 11 to generate heat according to the method of controlling heating of an electric drive system of a vehicle of any of the above embodiments. The heat exchange system 12 is configured to absorb heat generated by the electric drive system 11. The electrical drive control device 13 can be implemented by software to process and calculate various parameter signals, and can be integrated as a hardware device including a plurality of processing elements and modules.

Specifically, in the parking condition of the vehicle, when the power battery has a heating requirement, the electric drive control device 13 may send a control signal to the electric drive system 11, the motor controller 111 sends a corresponding control signal to control the electric motor 112 to operate in the low-efficiency mode, the electric motor 112 converts electric energy into thermal energy when operating, that is, a heat dissipation medium in the electric drive system 11 is heated by the heat consumption of the electric drive system 11 itself, the heat generated by the electric drive system 11 is transferred to the heat dissipation medium, the heat dissipation medium exchanges heat with a heat exchange system 12 in the vehicle, such as a plate-type heat exchange device, and the heat exchange system 12 absorbs the heat of the electric drive system 11 and transfers the heat to the power battery to heat the power battery.

According to the vehicle heating system 1 of the embodiment of the invention, based on the original architectures of the electric drive system 11 and the heat exchange system 12, the electric drive control device 13 is arranged to control the motor controller 111 and the motor 112 to operate in the low-efficiency mode under the parking condition of the vehicle, so that the electric drive system 11 operates in the high-loss state to generate a large amount of heat, the heat consumed by the electric drive system 11 is used for heating the heat dissipation medium in the electric drive system 11, the heat dissipation medium is further subjected to heat exchange with the heat exchange system 12, and the heat exchange system 12 can obtain the heat generated by the electric drive system 11 to heat the power battery. This vehicle heating system 1 need not external firing equipment, saves spare part cost, saves volume space and the mounting means is more nimble, can also improve the efficiency for power battery's heating.

In some embodiments of the present invention, as shown in fig. 11, a schematic diagram of a vehicle heating system according to an embodiment of the present invention is shown, wherein the motor may be a three-phase motor, the motor controller 111 may include six switching tubes T1, T2, T3, T4, T5, and T6, and a capacitor C1, and the switching unit S controls the power supply U to supply power to the motor controller 111. The switching tube T1 and the switching tube T2 are used for controlling the phase a of the motor 112, the switching tube T3 and the switching tube T4 are used for controlling the phase B of the motor 112, and the switching tube T5 and the switching tube T6 are used for controlling the phase C of the motor 112. The electric drive control device 13 acquires an electric drive low efficiency heating control parameter in response to the heating instruction, converts the electric current to obtain a three-phase drive voltage signal suitable for the three-phase motor, and pulse-width modulates the three-phase drive voltage signal according to the carrier frequency to obtain a pulse-width modulated signal for driving the motor controller 111. The pulse width modulation signal may be a six-way tuning signal, and is used to control the conduction states of six switching tubes in the motor controller 111. The motor controller 111 is responsive to the pulse width modulated signal to control the electric motor 112 to operate in a low efficiency mode with the electric drive system 11 in a high loss condition to generate a large amount of heat to heat the power cells.

In some embodiments of the invention, a computer-readable storage medium is also proposed, on which a computer program is stored, characterized in that the computer program realizes the method of controlling the heating of an electric drive system of a vehicle as described in any of the above embodiments when executed.

According to the computer readable storage medium of the embodiment of the invention, the computer program is stored thereon, when the computer program runs, the running parameters of each structure in the vehicle heating system 1 can be obtained for analysis and calculation, under the vehicle parking condition, the electric drive system is controlled to run in a high loss state to generate a large amount of heat, the power battery is heated by using the heat consumption of the electric drive system, so that the method for controlling the vehicle electric drive system to heat can be directly applied to the existing vehicle, the running states and parameters of each part of the vehicle and the like have memory, no external heating equipment is needed, the cost of parts and components is saved, the volume and the space are saved, the installation mode is more flexible, and the efficiency of heating the power battery can be improved.

In some embodiments of the present invention, as shown in fig. 12, there is a block diagram of a vehicle 10 according to an embodiment of the present invention, wherein the vehicle 10 includes a power battery 2, a vehicle controller 3, and the vehicle heating system 1 of the above third aspect embodiment.

The vehicle controller 3 is configured to issue a heating instruction when it is determined that the power battery 2 has a heating demand. Wherein, vehicle controller 3 is the host computer, can include BMS or VCU etc.. The vehicle heating system 1 is connected to a vehicle controller 3 for heating the power battery 2 in response to a heating instruction.

Specifically, when there is a heating demand on the power battery 2, the vehicle controller 3 issues a heating command to the vehicle heating system 1, the vehicle heating system 1 detects that the vehicle 10 is in a parked state and determines that the electric machine 112 is in a stationary state, and controls the electric machine 112 to operate in the inefficient mode in response to the heating command to cause the electric drive system 11 to generate heat. The heat consumption of the electric drive system 11 heats the heat dissipation medium in the electric drive system 11, and when the heat dissipation medium flows through the power battery 2, the heat is transferred to the power battery 2, so that the heating function of the power battery under the parking working condition of the vehicle 10 is realized.

According to the vehicle 10 of the embodiment of the invention, under the parking working condition of the vehicle 10, the vehicle controller 3 detects that the power battery 2 needs to be heated, and sends a heating instruction to the vehicle heating system 1, the motor controller 111 controls the motor 112 to operate in the low-efficiency mode, and converts electric energy into heat energy to heat the power battery 2, and the power battery 2 is heated by the heat consumption of the electric driving system 11, so that the vehicle can be directly realized in the existing hardware equipment, an external heating device is not needed, the part cost is saved, the volume space is saved, the installation mode is more flexible, and the efficiency of heating the power battery 2 can be improved.

Other configurations and operations of the vehicle 10 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A method of controlling heating in a vehicle electric drive system, the electric drive system including a motor controller and a motor, the method comprising:

detecting that a vehicle is in a parking state and determining that the motor is in a stationary state;

responsive to a heating command, acquiring an electric drive-low efficiency heating control parameter, wherein the electric drive-low efficiency heating control parameter comprises at least one of a current comprising a non-zero d-axis current and a carrier frequency greater than the carrier frequency in a vehicle normal drive mode;

obtaining a control signal for driving the motor controller according to the electric driving low efficiency heating control parameter;

and controlling the motor to operate in a low-efficiency mode according to the control signal so that the electric drive system generates heat.

2. Method for controlling heating in a vehicle electric drive system according to claim 1, characterized in that the d-axis current is positive or negative or is a pulsed current alternating positive and negative according to a preset alternating time.

3. The method of controlling vehicle electric drive system heating according to claim 2, wherein the current further includes a q-axis current that is zero or a current near zero.

4. The method of controlling vehicle electric drive system heating according to claim 1, wherein deriving the control signal to drive the motor controller based on the electric drive efficiency heating control parameter comprises:

converting the d-axis current and the q-axis current to obtain a three-phase driving voltage signal;

and performing pulse width modulation on the three-phase driving voltage signal according to the carrier frequency to obtain a pulse width modulation signal for driving the motor controller.

5. The method of controlling vehicle electric drive system heating according to claim 1, wherein detecting that the vehicle is in a parked state and determining that the electric machine is stationary comprises:

and detecting that the vehicle is in an N gear or a P gear, and determining that the rotating speed of the motor is less than a preset rotating speed.

6. The method of controlling vehicle electric drive system heating according to claim 5, further comprising:

determining that the rotating speed of the motor is greater than or equal to the preset rotating speed;

waiting for a preset time length;

and determining that the rotating speed of the motor is still greater than or equal to the preset rotating speed, and performing fault alarm.

7. An apparatus for controlling heating of a vehicle electric drive system, comprising:

the detection module is used for detecting that the vehicle is in a parking state and determining that the motor is in a static state;

a parameter acquisition module for acquiring an electric drive-low efficiency heating control parameter in response to a heating command, wherein the electric drive-low efficiency heating control parameter comprises at least one of a current comprising a non-zero d-axis current and a carrier frequency greater than the carrier frequency in a vehicle normal drive mode;

a control signal acquisition module for acquiring a control signal for driving a motor controller according to the electrically driven low efficiency heating control parameter;

and the control module is used for controlling the motor to operate in the low-efficiency mode according to the control signal so as to enable the electric drive system to generate heat.

8. A vehicle heating system, comprising:

an electric drive system including a motor controller and a motor;

a heat exchange system for absorbing heat generated by the electric drive system;

electric drive control device, which is connected to the electric drive system, for controlling the electric drive system for generating heat according to the method for controlling heating of a vehicle electric drive system as claimed in any of claims 1-6.

9. A computer-readable storage medium, on which a computer program is stored which, when being executed, carries out a method of controlling heating of an electric drive system of a vehicle according to any one of claims 1-6.

10. A vehicle, characterized by comprising:

a power battery;

the vehicle controller is used for sending a heating instruction when the power battery is determined to have a heating requirement;

the vehicle heating system of claim 8, connected to the vehicle controller for heating the power cell in response to the heating command.

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