CN112977388A - Power control method and device, vehicle control unit and range-extended electric vehicle - Google Patents
Power control method and device, vehicle control unit and range-extended electric vehicle Download PDFInfo
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- CN112977388A CN112977388A CN202110277164.9A CN202110277164A CN112977388A CN 112977388 A CN112977388 A CN 112977388A CN 202110277164 A CN202110277164 A CN 202110277164A CN 112977388 A CN112977388 A CN 112977388A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/182—Selecting between different operative modes, e.g. comfort and performance modes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
- B60W40/105—Speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The application discloses a power control method, a device, a vehicle control unit and an extended range electric vehicle, wherein the extended range electric vehicle comprises a single-stage speed reducer and an electric clutch which are arranged among a generator, an engine and a driving motor, and the method comprises the following steps: when the electric quantity is sufficient and no power is required, the electric clutch is disconnected to enter a pure electric mode, and when power is required, the electric clutch is connected to control the engine to work and the generator to be in a discharge state, and the electric clutch is coupled by using the single-stage speed reducer to enter a super driving mode; when the vehicle runs at a high speed and the electric quantity is insufficient, the electric clutch is connected, the engine drags the driving motor, and the generator is in a zero-torque state. Therefore, the problems that in the related art, when the extended range type electric automobile runs at a high speed, the engine cannot work in the optimal economic region, so that the oil consumption is increased, the fuel economy is poor, the loss of energy secondary conversion exists, the driving efficiency is low, the working mode is few, and different driving requirements of a driver cannot be met are solved.
Description
Technical Field
The application relates to the technical field of new energy vehicles, in particular to a power control method and device, a vehicle control unit and a range-extended electric vehicle.
Background
The range-extended electric vehicle is an electric vehicle which supplies electric energy through fuel oil under the condition that the electric quantity of a power battery is insufficient, has the advantages of zero emission of pure electric driving, low medium and low speed oil consumption, no worry of endurance mileage and the like, and has the following working principle:
when the power battery is sufficient in electric quantity, the power battery supplies power to the driving motor to provide the power requirement of the whole vehicle, and the engine does not participate in the work at the moment; when the electric quantity of the power battery is consumed to a certain degree, the engine is started, the generator is driven by the engine to charge the power battery, and the power battery is stopped when the power battery is fully charged.
However, the extended range electric vehicle still provides main power by the engine per se, and when the vehicle travels at a high speed, the output power of the engine is larger due to larger power demand, and the vehicle cannot work in an optimal economic interval, so that the fuel consumption is increased, the fuel economy is poor, the loss of energy secondary conversion exists, the driving efficiency is low, and the working mode is few, and different driving requirements of a driver cannot be met, so that a solution is needed urgently.
Content of application
The application provides a power control method and device, a vehicle control unit and a range-extended electric vehicle, and aims to solve the problems that in the related art, when the range-extended electric vehicle runs at a high speed, an engine cannot work in an optimal economic region, so that oil consumption is increased, fuel economy is poor, energy secondary conversion loss exists, driving efficiency is low, a few working modes cannot meet different driving requirements of a driver, and the like.
An embodiment of a first aspect of the present application provides a power control method for an extended range electric vehicle, where the extended range electric vehicle includes a single-stage speed reducer and an electric clutch, which are disposed between a generator, an engine, and a driving motor, and the method includes the following steps: detecting the actual residual capacity of a power battery of the extended range electric automobile; when the actual residual electric quantity is greater than or equal to a preset threshold and no power demand exists, controlling the electric clutch to be disconnected to enable the extended range type electric automobile to enter a pure electric mode, and when the actual residual electric quantity is greater than or equal to the preset threshold and power demand exists, controlling the electric clutch to be connected to control the engine to work, controlling the generator to be in a discharging state, and utilizing the single-stage speed reducer to carry out coupling to enable the extended range type electric automobile to enter a super driving mode; and when the actual residual electric quantity is smaller than a preset threshold value, acquiring the actual speed of the extended range type electric automobile, and when the actual speed is larger than the preset speed, controlling the electric clutch to be connected so as to drive the driving motor while the engine works, so that the generator is in a zero-torque state.
Further, the method of the embodiment of the present application further includes: and when the actual residual electric quantity is smaller than a preset threshold value and the actual vehicle speed is smaller than or equal to a preset vehicle speed, controlling the electric clutch to be disconnected, controlling the engine to work, and enabling the range-extended electric vehicle to enter a range-extended power generation mode while charging the power battery.
Further, the method of the embodiment of the present application further includes: if the change curve of the actual residual electric quantity of the power battery meets a preset condition and no power demand is provided, controlling the power of the driving motor to be equal to that of the engine, so that the power battery is in an electric quantity balance state; and if the change curve of the actual residual capacity of the power battery meets the preset condition and power demand exists, controlling the generator to enter a discharging state, so that the electric automobile enters the super-driving mode, and the engine, the generator and the driving motor work simultaneously.
Further, the method of the embodiment of the present application further includes: and if the actual residual capacity of the power battery is less than the preset residual capacity and the duration is longer than the preset duration, controlling the generator to work, so that the electric automobile enters an engine direct-drive and range-extended power generation mode, and the power battery is charged while the power is provided for the electric automobile.
An embodiment of a second aspect of the present application provides a power control device of an extended range electric vehicle, the extended range electric vehicle including a single-stage speed reducer and an electric clutch which are disposed between a generator, an engine and a driving motor, wherein the device includes: the detection module is used for detecting the actual residual electric quantity of the power battery of the extended range electric automobile; the first control module is used for controlling the electric clutch to be disconnected when the actual residual electric quantity is greater than or equal to a preset threshold and no power demand exists, so that the extended range type electric automobile enters a pure electric mode, controlling the electric clutch to be connected when the actual residual electric quantity is greater than or equal to the preset threshold and power demand exists, controlling the engine to work, controlling the generator to be in a discharging state, and utilizing the single-stage speed reducer to perform coupling so that the extended range type electric automobile enters a super driving mode; the second control module is used for acquiring the actual speed of the extended range type electric automobile when the actual residual electric quantity is smaller than a preset threshold value, and controlling the electric clutch to be connected when the actual speed is larger than the preset speed so as to drive the driving motor to enable the generator to be in a zero-torque state while the engine works.
Further, the device of this application embodiment still includes: and the third control module is used for controlling the electric clutch to be disconnected and controlling the engine to work when the actual residual electric quantity is smaller than a preset threshold value and the actual vehicle speed is smaller than or equal to a preset vehicle speed, so that the range-extended electric vehicle enters a range-extended power generation mode while the power battery is charged.
Further, the device of this application embodiment still includes: the fourth control module is used for controlling the power of the driving motor to be equal to that of the engine when the change curve of the actual residual electric quantity of the power battery meets a preset condition and no power demand exists, so that the power battery is in an electric quantity balance state; and when the change curve of the actual residual capacity of the power battery meets the preset condition and power demand exists, controlling the generator to enter a discharging state, so that the electric automobile enters the super-driving mode, and the engine, the generator and the driving motor work simultaneously.
Further, the device of this application embodiment still includes: and the fifth control module is used for controlling the generator to work when the actual residual capacity of the power battery is less than the preset residual capacity and the duration is longer than the preset duration, so that the electric automobile enters an engine direct-drive and range-extended power generation mode, and the power battery is charged while the electric automobile is provided with power.
According to a third aspect of the present application, an embodiment provides a vehicle control unit, which includes the power control device of the extended range electric vehicle.
In a fourth aspect of the present application, an extended range electric vehicle is provided, which includes the vehicle control unit.
When the automobile runs at a high speed, the electric clutch is controlled to connect so that the power of the engine is directly used for driving the motor, the loss of energy secondary conversion is avoided, the driving efficiency is improved, the power requirement of the whole automobile can be met without large output power, the engine can work in an optimal economic interval, the oil consumption is effectively reduced, the fuel economy is improved, the power of the automobile can be effectively improved through the coupling of the single-stage speed reducer, the power requirement of a driver is met, multiple working modes are provided simultaneously, different driving requirements of the driver are effectively met, and the use experience of the driver is improved. Therefore, the problems that in the related art, when the extended range type electric automobile runs at a high speed, an engine cannot work in an optimal economic region, so that oil consumption is increased, fuel economy is poor, energy secondary conversion loss exists, driving efficiency is low, and different driving requirements of a driver cannot be met due to few working modes are solved.
Additional aspects and advantages of the present application 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 present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application 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 system diagram of an extended range electric vehicle according to an embodiment of the present application;
fig. 2 is a flowchart of a power control method of an extended range electric vehicle according to an embodiment of the present application;
fig. 3 is a flowchart of a power control method of an extended range electric vehicle according to an embodiment of the present application;
fig. 4 is a block diagram illustrating a power control apparatus of an extended range electric vehicle according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes a power control method and device, a vehicle control unit, and an extended range electric vehicle of an extended range electric vehicle according to an embodiment of the present application with reference to the drawings. In order to solve the problems that the engine cannot work in the optimal economic region when the extended range electric vehicle runs at high speed, so that the oil consumption is increased, the fuel economy is poor, the loss of energy secondary conversion exists, the driving efficiency is low, the working mode is few, and different driving requirements of a driver cannot be met, in the related technology mentioned in the background technology center, the power control method of the extended range electric vehicle is provided, in the method, the power of the engine is directly used for driving the motor by controlling the connection of the electric clutch during the high-speed running, the loss of the energy secondary conversion is avoided, the driving efficiency is improved, the power requirement of the whole vehicle can be met without large output power, the engine is enabled to work in the optimal economic region, the oil consumption is effectively reduced, the fuel economy is improved, and the power of the vehicle can be effectively improved through the coupling of the single-stage speed reducer, satisfy driver's power demand, provide multiple mode simultaneously, effectively satisfy the driving demand that the driver is different, promote driver's use and experience. Therefore, the problems that in the related art, when the extended range type electric automobile runs at a high speed, an engine cannot work in an optimal economic region, so that oil consumption is increased, fuel economy is poor, energy secondary conversion loss exists, driving efficiency is low, and different driving requirements of a driver cannot be met due to few working modes are solved.
Before introducing the power control method of the extended range electric vehicle, the extended range electric vehicle according to the embodiment of the present application is introduced, as shown in fig. 1, the extended range electric vehicle includes: the system comprises a generator 1, an engine 2, a driving motor 3, a single-stage speed reducer 4, an electric clutch 5 and a power battery 6. Wherein, the generator 1 and the engine 2 are coaxially and rigidly connected to realize complete synchronous operation; the driving motor 3 is used for driving the range-extended electric automobile to run; the electric clutch 5 can be controlled to be connected and disconnected by the control unit so as to realize the connection and disconnection of the driving system and the range-extended power generation system; the power battery 6 is used for supplying electric energy to the driving motor 3 and can store the electric energy. Wherein the arrows in fig. 1 indicate the current flow direction. The power control method of the extended range electric vehicle according to the embodiment of the present application will be described in detail with reference to the extended range electric vehicle shown in fig. 1.
Specifically, fig. 2 is a schematic flow chart of a power control method of an extended range electric vehicle according to an embodiment of the present application.
As shown in fig. 2, the power control method of the extended range electric vehicle includes the following steps:
in step S101, an actual remaining capacity of a power battery of the extended range electric vehicle is detected.
In the embodiment of the present application, the actual remaining capacity of the power battery may be determined by detecting the SOC (state of charge) of the power battery. The SOC is the ratio of the residual capacity of the power battery to the capacity of the power battery in a full-charge state, can be expressed by percentage, and has a value range of 0-1, when the SOC is 0, the power battery is completely discharged, and when the SOC is 1, the power battery is completely full.
For example, when the SOC of the power battery is detected to be 40%, the actual remaining capacity of the power battery may be determined to be 40%.
In step S102, when the actual remaining power is greater than or equal to the preset threshold and no power demand is provided, the electric clutch is controlled to be disconnected, so that the extended-range electric vehicle enters the pure electric mode, and when the actual remaining power is greater than or equal to the preset threshold and power demand is provided, the electric clutch is controlled to be connected, the engine is controlled to work, the generator is controlled to be in the discharging state, and the single-stage reducer is used for coupling, so that the extended-range electric vehicle enters the super-drive mode.
The preset threshold may be calibrated according to the actual capacity of the power battery, for example, the preset threshold may be 30% or 40% of full charge of the power battery, and the like, and is not particularly limited; when the vehicle with understandable power demand is in a working condition requiring more power, such as rapid acceleration or high-speed overtaking, the driver has an urgent demand for the power.
It is understood that when the actual remaining capacity is greater than or equal to the preset threshold, it indicates that the remaining capacity of the power battery is sufficient, and at this time, the mode of the vehicle may be further controlled according to the power demand of the driver, specifically:
(1) if the driver does not have power demand, when the electric clutch is controlled to be disconnected, the power generation system and the driving system are completely disconnected, and if the engine does not drive the generator to generate power, namely the engine does not work, the vehicle is in a pure electric running mode. And in the pure electric running mode, high-voltage current flows between the power battery and the driving motor in a bidirectional mode.
(2) If the driver has a power demand, the electric clutch is controlled to be connected, the generator is switched to a discharging state, namely the generator is in a driving state, the power battery is in a discharging state, the engine, the generator and the driving motor are overlapped to drive the vehicle at the moment, the vehicle enters a super driving mode, the driving power is equal to the sum of the driving power of the driving motor, the driving power of the generator and the output power of the engine, the dynamic property is strongest, and the power demand of the driver can be effectively met. In the super-driving mode, high-voltage current flows from the power battery to the driving motor and the generator.
It should be noted that, in the embodiment of the present application, the single-stage reducer can be used to adapt the operating points of the engine, the generator and the driving motor, so that the optimal operating efficiency is achieved in the coupled operating state of the engine, the generator and the driving motor.
In step S103, when the actual remaining power is less than the preset threshold, the actual vehicle speed of the extended range electric vehicle is obtained, and when the actual vehicle speed is greater than the preset vehicle speed, the electric clutch is controlled to connect, so that the engine works, and the driving motor is dragged, so that the generator is in a zero-torque state.
The preset vehicle speed may be calibrated according to an experiment, for example, the preset vehicle speed may be 80km/h or 90km/h, and the like, which is not particularly limited.
It can be understood that when the actual remaining capacity is smaller than the preset threshold, indicating that the current capacity is insufficient, the embodiment of the present application may further determine the mode of the vehicle according to the actual vehicle speed. In the embodiment, when the vehicle runs at a high speed and the electric quantity is insufficient, the electric clutch is controlled to be connected, the generator is enabled to keep a zero-torque state, the vehicle is in an engine direct-drive mode, and high-voltage current flows between the power battery and the driving motor in a bidirectional mode.
For example, when the actual remaining power is less than 30% and the actual vehicle speed is greater than or equal to 80km/h, it is determined that the vehicle is in a high-speed running state and the power is insufficient, the vehicle can be controlled to enter an engine direct-drive mode, so that the power of the engine is directly used for driving the motor by controlling the connection of the electric clutch, the loss of energy secondary conversion is avoided, the driving efficiency is improved, the power requirement of the whole vehicle can be met without large output power, the engine is enabled to work in an optimal economic region, the fuel consumption is effectively reduced, and the fuel economy is improved.
In some implementations, when the vehicle is in a high-speed driving state and the power is insufficient, the method of the embodiment of the present application further includes: if the change curve of the actual residual electric quantity of the power battery meets the preset condition and no power demand is provided, controlling the power of the driving motor to be equal to that of the engine, so that the power battery is in an electric quantity balance state; if the change curve of the actual residual capacity of the power battery meets the preset condition and the power demand exists, the generator is controlled to enter a discharging state, so that the electric automobile enters a super driving mode, and the engine, the generator and the driving motor work simultaneously.
The preset condition can be set as that the variation curve of the actual residual capacity is in a set interval, for example, the actual residual capacity is greater than or equal to 20% and less than 30%, when the variation curve is determined to be in an interval of [ 20%, 30%), the embodiment of the application further judges whether the driver has a power demand, and if the variation curve has no power demand, the vehicle is kept in the engine direct drive mode; if the driver has a power demand, the vehicle is controlled to be in a super-driving mode so as to meet different driving demands when the driver runs at a high speed, and the use experience of the user is improved.
In some implementations, when the vehicle is in a high-speed driving state and the power is insufficient, the method of the embodiment of the present application further includes: and if the actual residual capacity of the power battery is less than the preset residual capacity and the duration is longer than the preset duration, controlling the generator to work, so that the electric automobile enters an engine direct-drive and range-extended power generation mode, and the power battery is charged while the power is provided for the electric automobile.
The preset residual capacity can be calibrated according to the actual capacity of the power battery, and can be 20% or 10% of the total capacity of the battery, for example; the preset duration can be calibrated according to actual conditions, and whether the actual residual capacity is consistent and in a too low state can be determined according to the preset duration.
When the actual residual capacity is smaller than the preset residual capacity and lasts for a certain time, the actual residual capacity of the power battery can be determined to be in an excessively low state all the time, the vehicle is controlled to enter an engine direct-drive and range-extended power generation mode, and the super-drive mode is prohibited from being started, so that the power battery is charged while the power requirement of the vehicle running at a high speed is guaranteed. The engine direct-drive and range-extending power generation mode is a mode in which the engine direct-drive mode and the range-extending power generation mode are started together.
In some implementations, the method of embodiments of the present application further comprises: when the actual residual electric quantity is smaller than the preset threshold value and the actual vehicle speed is smaller than or equal to the preset vehicle speed, the electric clutch is controlled to be disconnected, the engine is controlled to work, and the range-extended electric vehicle enters a range-extended power generation mode while the power battery is charged.
In this embodiment, when the remaining capacity of the power battery is small and the vehicle speed is a medium-low speed, the range-extended electric vehicle may be controlled to enter the range-extended power generation mode, specifically: and controlling the electric clutch to be connected, and enabling the generator to be in a power generation state and the power battery to be in a charging state, wherein the power output by the engine is approximately equal to the sum of the consumed energy of the driving motor and the charging power of the power battery, and a small amount of current flows between the power battery and the driving motor in a bidirectional mode.
For example, when the actual remaining capacity is less than 30% and the actual vehicle speed is less than 80km/h, it may be determined that the vehicle is in a state of insufficient capacity and low vehicle speed, and at this time, the vehicle is controlled to enter the range-extended power generation mode, the engine is controlled to start to operate, and the generator is driven to generate power.
To sum up, the embodiment of the application enriches the working modes of the extended range electric automobile, better satisfies the diversified driving requirements of the driver, improves the fuel economy of high-speed driving while keeping the high efficiency of the extended range electric automobile when the extended range electric automobile is driven at medium and low speeds, effectively avoids the problem that the driving efficiency of the extended range electric automobile is lower due to energy conversion when the extended range electric automobile is driven at high speed in the related technology, and can be equivalent to the efficiency of the fuel automobile when the extended range electric automobile is driven at high speed.
The power control method of the extended range electric vehicle will be described by an embodiment, as shown in fig. 3, including the following steps:
step S1: when the vehicle runs normally, the control unit starts to judge the electric quantity of the power battery, judges whether the actual residual electric quantity of the power battery is greater than or equal to 30 percent, and if so, executes the step S2; if not, go to step S3;
step S2: if no large power requirements such as emergency acceleration or high-speed overtaking exist, the clutch-motor clutch is controlled to be disconnected, the engine does not work, and the range-extended electric automobile is in a pure electric mode; if the high power requirements such as rapid acceleration or high-speed overtaking exist, controlling the engine to work, controlling the generator to be in a discharging state, and entering a super driving mode;
step S3: starting to judge the vehicle speed, judging whether the vehicle speed is greater than or equal to 80km/h, if so, executing step S4, and if not, executing step S5;
step S4: the braking clutch is disconnected, the engine works, the power battery is charged, and the extended-range power generation mode is entered;
step S5: controlling the clutch to be connected, enabling the engine to work and directly drag the driving motor, enabling the generator to be in a zero-torque state, and entering an engine direct-drive mode;
step S6: judging whether the actual residual capacity is less than 30% and greater than or equal to 20%, if yes, executing step S7, and if no, executing step S8;
step S7: the requirement of needing large driving power such as rapid acceleration does not exist, the power of the driving motor is controlled to be equal to the power of the engine, and the electric quantity balance of the power battery is kept; when the requirements of high power such as rapid acceleration or high-speed overtaking exist, the generator is controlled to be switched to a discharging state, the vehicle enters a super driving mode, and the engine, the generator and the driving motor simultaneously provide driving force;
step S8: if the electric quantity is continuously reduced to be less than 20%, the generator starts to generate power, the vehicle enters an engine direct-drive + range-extending power generation mode, and the battery is charged while power is provided.
According to the power control method of the extended range type electric automobile, when the automobile runs at a high speed, the power of the engine is directly used for driving the motor by controlling the connection of the electric clutch, the loss of energy secondary conversion is avoided, the driving efficiency is improved, the power requirement of the whole automobile can be met without large output power, the engine is enabled to work in the optimal economic region, the oil consumption is effectively reduced, the fuel economy is improved, the power of the automobile can be effectively improved through the coupling of the single-stage speed reducer, the power requirement of a driver is met, multiple working modes are provided simultaneously, different driving requirements of the driver are effectively met, and the use experience of the driver is improved.
Next, a power control device of an extended range electric vehicle according to an embodiment of the present application will be described with reference to the drawings.
Fig. 4 is a block diagram schematically illustrating a power control apparatus of an extended range electric vehicle according to an embodiment of the present application.
The extended range electric automobile comprises a single-stage speed reducer and an electric clutch which are arranged among a generator, an engine and a driving motor. As shown in fig. 4, the power control apparatus 100 of the extended range electric vehicle includes: a detection module 110, a first control module 120, and a second control module 130.
The detection module 110 is configured to detect an actual remaining power of a power battery of the extended range electric vehicle; the first control module 120 is configured to control the electric clutch to be disconnected when the actual remaining power is greater than or equal to a preset threshold and no power demand is met, so that the extended-range electric vehicle enters a pure electric mode, control the electric clutch to be connected when the actual remaining power is greater than or equal to the preset threshold and power demand is met, control the engine to work, control the generator to be in a discharging state, and couple the generator through the single-stage reducer, so that the extended-range electric vehicle enters a super-drive mode; the second control module 130 is configured to obtain an actual vehicle speed of the extended range electric vehicle when the actual remaining power is less than a preset threshold, and control the electric clutch to connect when the actual vehicle speed is greater than the preset vehicle speed, so as to drive the driving motor while the engine operates, and enable the generator to be in a zero-torque state.
Further, the apparatus 100 of the embodiment of the present application further includes: and a third control module. The third control module is used for controlling the electric clutch to be disconnected and controlling the engine to work when the actual residual electric quantity is smaller than the preset threshold value and the actual vehicle speed is smaller than or equal to the preset vehicle speed, so that the range-extended electric vehicle enters a range-extended power generation mode while the power battery is charged.
Further, the apparatus 100 of the embodiment of the present application further includes: and a fourth control module. The fourth control module is used for controlling the power of the driving motor to be equal to that of the engine when the change curve of the actual residual electric quantity of the power battery meets a preset condition and no power demand exists, so that the power battery is in an electric quantity balance state; when the change curve of the actual residual capacity of the power battery meets the preset condition and power demand exists, the generator is controlled to enter a discharging state, so that the electric automobile enters a super driving mode, and the engine, the generator and the driving motor work simultaneously.
Further, the apparatus 100 of the embodiment of the present application further includes: and a fifth control module. The fifth control module is used for controlling the generator to work when the actual residual capacity of the power battery is smaller than the preset residual capacity and the duration is longer than the preset duration, so that the electric automobile enters an engine direct-drive and range-extended power generation mode, and the power battery is charged while the electric automobile is powered.
It should be noted that the above explanation of the embodiment of the power control method of the extended range electric vehicle is also applicable to the power control device of the extended range electric vehicle of the embodiment, and is not repeated herein.
According to the power control device of the extended range type electric automobile provided by the embodiment of the application, when driving at a high speed, the power of the engine is directly used for driving the motor by controlling the connection of the electric clutch, the loss of energy secondary conversion is avoided, the driving efficiency is improved, the power requirement of the whole automobile can be met without large output power, the engine is enabled to work in the optimal economic region, the oil consumption is effectively reduced, the fuel economy is improved, the power of the automobile can be effectively improved through the coupling of the single-stage speed reducer, the power requirement of a driver is met, multiple working modes are provided simultaneously, different driving requirements of the driver are effectively met, and the use experience of the driver is improved.
In addition, the embodiment of the application also provides a vehicle control unit, which comprises the power control device of the extended range electric vehicle. This vehicle control unit, when going at high speed, connect through control electric clutch and make the power of engine directly be used for driving motor, avoid the loss of energy secondary conversion, improve the drive efficiency, need not great output power and can satisfy whole car power demand, make the engine keep working in the optimum economy interval, effectively reduce the oil consumption, improve the fuel economy, and can effectively improve the power of vehicle through the coupling of single reduction gear, satisfy driver's power demand, multiple mode is provided simultaneously, effectively satisfy the different driving demands of driver, promote driver's use and experience.
In addition, the embodiment of the application also provides an extended range electric vehicle, which comprises the vehicle control unit. This increase form electric automobile can be when going at high speed, connect through control electric clutch and make the power of engine directly be used for driving motor, avoid the loss of energy secondary conversion, improve the drive efficiency, need not great output and can satisfy whole car power demand, make the engine keep working in optimum economy interval, effectively reduce the oil consumption, improve the fuel economy, and can effectively improve the power of vehicle through the coupling of single reduction gear, satisfy driver's power demand, multiple mode is provided simultaneously, effectively satisfy the different driving demands of driver, promote driver's use and experience.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
Claims (10)
1. A power control method of an extended range electric automobile is characterized in that the extended range electric automobile comprises a single-stage speed reducer and an electric clutch which are arranged among a generator, an engine and a driving motor, wherein the method comprises the following steps:
detecting the actual residual capacity of a power battery of the extended range electric automobile;
when the actual residual electric quantity is greater than or equal to a preset threshold and no power demand exists, controlling the electric clutch to be disconnected to enable the extended range type electric automobile to enter a pure electric mode, and when the actual residual electric quantity is greater than or equal to the preset threshold and power demand exists, controlling the electric clutch to be connected to control the engine to work, controlling the generator to be in a discharging state, and utilizing the single-stage speed reducer to carry out coupling to enable the extended range type electric automobile to enter a super driving mode; and
and when the actual residual electric quantity is smaller than a preset threshold value, acquiring the actual speed of the extended range type electric automobile, and when the actual speed is larger than the preset speed, controlling the electric clutch to be connected so as to drive the driving motor while the engine works, so that the generator is in a zero-torque state.
2. The method of claim 1, further comprising:
and when the actual residual electric quantity is smaller than a preset threshold value and the actual vehicle speed is smaller than or equal to a preset vehicle speed, controlling the electric clutch to be disconnected, controlling the engine to work, and enabling the range-extended electric vehicle to enter a range-extended power generation mode while charging the power battery.
3. The method of claim 2, further comprising:
if the change curve of the actual residual electric quantity of the power battery meets a preset condition and no power demand is provided, controlling the power of the driving motor to be equal to that of the engine, so that the power battery is in an electric quantity balance state;
and if the change curve of the actual residual capacity of the power battery meets the preset condition and power demand exists, controlling the generator to enter a discharging state, so that the electric automobile enters the super-driving mode, and the engine, the generator and the driving motor work simultaneously.
4. The method of claim 2 or 3, further comprising:
and if the actual residual capacity of the power battery is less than the preset residual capacity and the duration is longer than the preset duration, controlling the generator to work, so that the electric automobile enters an engine direct-drive and range-extended power generation mode, and the power battery is charged while the power is provided for the electric automobile.
5. A power control device of an extended range electric automobile is characterized in that the extended range electric automobile comprises a single-stage speed reducer and an electric clutch which are arranged among a generator, an engine and a driving motor, wherein the device comprises:
the detection module is used for detecting the actual residual electric quantity of the power battery of the extended range electric automobile;
the first control module is used for controlling the electric clutch to be disconnected when the actual residual electric quantity is greater than or equal to a preset threshold and no power demand exists, so that the extended range type electric automobile enters a pure electric mode, controlling the electric clutch to be connected when the actual residual electric quantity is greater than or equal to the preset threshold and power demand exists, controlling the engine to work, controlling the generator to be in a discharging state, and utilizing the single-stage speed reducer to perform coupling so that the extended range type electric automobile enters a super driving mode; and
the second control module is used for acquiring the actual speed of the extended range type electric automobile when the actual residual electric quantity is smaller than a preset threshold value, and controlling the electric clutch to be connected when the actual speed is larger than the preset speed so as to drive the driving motor to enable the generator to be in a zero-torque state while the engine works.
6. The apparatus of claim 5, further comprising:
and the third control module is used for controlling the electric clutch to be disconnected and controlling the engine to work when the actual residual electric quantity is smaller than a preset threshold value and the actual vehicle speed is smaller than or equal to a preset vehicle speed, so that the range-extended electric vehicle enters a range-extended power generation mode while the power battery is charged.
7. The apparatus of claim 6, further comprising:
the fourth control module is used for controlling the power of the driving motor to be equal to that of the engine when the change curve of the actual residual electric quantity of the power battery meets a preset condition and no power demand exists, so that the power battery is in an electric quantity balance state; and when the change curve of the actual residual capacity of the power battery meets the preset condition and power demand exists, controlling the generator to enter a discharging state, so that the electric automobile enters the super-driving mode, and the engine, the generator and the driving motor work simultaneously.
8. The apparatus of claim 6 or 7, further comprising:
and the fifth control module is used for controlling the generator to work when the actual residual capacity of the power battery is less than the preset residual capacity and the duration is longer than the preset duration, so that the electric automobile enters an engine direct-drive and range-extended power generation mode, and the power battery is charged while the electric automobile is provided with power.
9. A vehicle control unit, comprising: the power control device of the extended range electric vehicle according to any one of claims 4 to 8.
10. An extended range electric vehicle, comprising: the vehicle control unit of claim 9.
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