CN112319248B - Method and device for controlling starting of engine of extended range electric vehicle - Google Patents
Method and device for controlling starting of engine of extended range electric vehicle Download PDFInfo
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- CN112319248B CN112319248B CN202011289390.0A CN202011289390A CN112319248B CN 112319248 B CN112319248 B CN 112319248B CN 202011289390 A CN202011289390 A CN 202011289390A CN 112319248 B CN112319248 B CN 112319248B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
- B60L50/62—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles charged by low-power generators primarily intended to support the batteries, e.g. range extenders
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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
-
- 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention provides a control method and a device for starting an engine of an extended range electric vehicle, relates to the technical field of extended range electric vehicles, and is applied to a vehicle control unit.
Description
Technical Field
The invention relates to the technical field of extended range electric vehicles, in particular to a method and a device for controlling the starting of an engine of an extended range electric vehicle.
Background
In the application process of the existing extended range electric vehicle, in order to ensure the State of Charge (SOC) of the power battery, which may be called the battery SOC, the SOC is maintained within a certain preset range, and when the SOC of the power battery is lower than a preset Charge level X, the engine is controlled to start, so that the engine drives the generator to Charge the power battery, thereby ensuring that the SOC of the power battery is not lower than the preset Charge level X.
However, the inventor finds that the power of the power battery which needs to be consumed for controlling the starting of the engine may cause the situation of insufficient power in some application occasions of the vehicle, and thus good driving experience cannot be provided for users.
Disclosure of Invention
In view of this, the present invention provides a method and a device for controlling the starting of an engine of an extended range electric vehicle, which ensure that the vehicle has better power driving experience in various application scenarios by controlling the starting time of the engine of the extended range electric vehicle.
In a first aspect, an embodiment provides a control method for starting an engine of an extended range electric vehicle, which is applied to a vehicle control unit, and the method includes:
and when the residual charge state of the power battery is lower than the preset charge level, and under the condition that the difference value of the current maximum discharge power of the power battery and the required power of the driving motor is larger than the required power of the starter, controlling the engine to start.
In an alternative embodiment, the method further comprises:
and acquiring the current maximum discharge power of the power battery, and sending the current maximum discharge power to a vehicle control unit.
In an alternative embodiment, the method further comprises:
the method comprises the steps of obtaining required power of a starter and sending the required power to a whole vehicle control unit, wherein the required power is required power for starting an engine.
In an alternative embodiment, the method further comprises:
acquiring a vehicle speed signal and an accelerator pedal opening degree signal;
and determining the required power of the driving motor according to the vehicle speed signal and the accelerator opening signal.
In an alternative embodiment, the step of obtaining the accelerator pedal opening degree signal includes:
an accelerator pedal opening degree signal is collected through an accelerator pedal opening degree sensor, and the signal is sent to the whole vehicle control unit.
In an alternative embodiment, the step of obtaining the vehicle speed signal comprises:
collecting a wheel speed signal through a vehicle wheel speed sensor, and sending the wheel speed signal to a vehicle stability system ESC controller so that the vehicle stability system ESC controller converts the wheel speed signal into a vehicle speed signal;
and receiving the vehicle speed signal sent by the ESC controller of the vehicle stability system through a CAN network.
In an alternative embodiment, the method further comprises:
and under the condition that the engine starting time is reached, sending a starting signal to a starter control unit to start the engine.
In a second aspect, an embodiment provides a control device for starting an engine of an extended range electric vehicle, which is applied to a control unit of the whole vehicle, and the device includes:
and the starting control module is used for controlling the engine to start when the residual charge state of the power battery is lower than the preset charge level and the difference value between the current maximum discharge power of the power battery and the required power of the driving motor is larger than the required power of the starter.
In a third aspect, an embodiment provides an electronic device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the method described in any one of the foregoing embodiments when executing the computer program.
In a fourth aspect, embodiments provide a machine-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any preceding embodiment.
According to the control method and device for starting the engine of the extended range electric vehicle, when the residual charge state of the power battery is lower than the preset charge level, the engine is not started immediately, whether the required power for controlling the starting of the starter can be continuously supplied or not is continuously judged after the current maximum discharge power of the power battery is supplied to the required power of the driving motor is continuously judged, and if the required power can be supplied, the engine is controlled to be started. Under the constraint of the control strategy, the vehicle can be guaranteed to have good power running experience in various application scenes.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an energy flow relationship of an extended range electric vehicle;
FIG. 2 is a flowchart illustrating a method for controlling engine start of an extended range electric vehicle according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating another method for controlling engine start of an extended range electric vehicle according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of a control device for starting an engine of an extended range electric vehicle according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware architecture of an electronic device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the current extended range electric vehicle, the engine is connected with the generator, the generator is connected with the power battery, and the power battery is connected with the driving motor, and the energy flow relationship is shown in fig. 1. And if the SOC of the power battery is lower than the preset charge level X, taking a generator connected with the engine at the moment as a starter, wherein the starter is used for controlling the engine to start under the condition that the power battery provides a part of discharge power.
The inventor researches and discovers that when a driver user of a vehicle is in an application scene needing large accelerator acceleration or going up a slope, if the SOC of a power battery is lower than a preset charge level X, the power battery supplies driving power needed to be applied in the current scene, and also needs to provide certain power to drive a starter to start an engine. Because the maximum discharge power of the power battery is limited, after the power battery is supplied to the starter, the power which can be supplied to the driving motor is small, and the driving power which is generally required by the application scenes like the above application scenes is high, so that the situation that the power of the vehicle is insufficient in the application scenes such as acceleration/uphill and the like is caused, and meanwhile, a user in the vehicle has a power weakening feeling, and the driving experience or the riding experience is poor.
Based on this, the control method and the control device for starting the engine of the extended range electric vehicle provided by the embodiment of the invention ensure that the vehicle has better power running experience in various application scenes by controlling the starting time of the engine of the extended range electric vehicle.
For the convenience of understanding the embodiment, a detailed description will be given to a control method based on engine starting of an extended range electric vehicle disclosed in the embodiment of the invention, and the method is applied to a vehicle control unit.
Fig. 2 is a flowchart of a method for controlling engine start of an extended range electric vehicle according to an embodiment of the present invention.
As shown in fig. 2, the method may include the steps of:
and S102, acquiring the current maximum discharge power of the power battery, and sending the current maximum discharge power to a vehicle control unit.
The maximum discharge power of the power Battery is collected by a Battery Management System (BMS).
And step S104, acquiring the required power of the starter, and sending the required power to a vehicle control unit, wherein the required power is the required power for starting the engine.
Here, the required power of the starter is acquired by a starter Control Unit (GCU).
And step S106, acquiring a vehicle speed signal and an accelerator opening signal, and determining the required power of the driving motor according to the vehicle speed signal and the accelerator opening signal.
Here, according to the mapping relationship preset by a person skilled in the art, the required power of the driving motor at the time corresponding to the mapping can be found under the condition that the vehicle speed signal and the accelerator opening degree signal are respectively obtained.
And step S108, acquiring the residual charge state of the power battery.
It can be understood that the parameters of current, voltage and the like of the power battery are monitored in real time through the battery management system, and the state of residual charge is calculated in real time based on the parameters.
And step S110, when the residual charge state of the power battery is lower than a preset charge level, and under the condition that the difference value between the current maximum discharge power of the power battery and the required power of the driving motor is larger than the required power of the starter, controlling the engine to start.
In a practical preferred embodiment, when the residual charge state of the power battery is lower than the preset charge level, the engine is not started immediately, and whether the current maximum discharge power of the power battery can still supply the required power for controlling the starting of the starter after supplying the required power of the driving motor is continuously judged, and if the current maximum discharge power of the power battery can still supply the required power for controlling the starting of the starter, the engine is controlled to start. Under the constraint of the control strategy, the vehicle can be guaranteed to have good power running experience in various application scenes.
It should be noted that in practical application, acceleration, increased force for stepping on the accelerator or ascending a slope, etc. are required, and the number of scenes requiring large driving power is not large, so that the situation that the power battery is insufficient due to the fact that the engine is not started at the right moment does not occur.
In an alternative embodiment, the step of obtaining the accelerator opening signal in step S106 may be implemented by the following steps, including:
and 1.1) acquiring an accelerator pedal opening signal through an accelerator pedal opening sensor, and sending the signal to the whole vehicle control unit.
In an alternative embodiment, the step of obtaining the vehicle speed signal in step S106 includes:
step 2.1), collecting a wheel speed signal through a vehicle wheel speed sensor, and sending the wheel speed signal to a vehicle Stability system (ESC), namely an ESC Controller, so that the ESC Controller of the vehicle Stability system converts the wheel speed signal into a vehicle speed signal;
and 2.2) receiving the vehicle speed signal sent by the ESC controller of the vehicle stability system through a CAN network.
In an alternative embodiment, the method further comprises the steps of:
and 3.1) sending a starting signal to a starter control unit to start the engine under the condition that the starting time of the engine is reached.
The engine start timing mentioned here is the start timing in step S110, that is, when the remaining state of charge of the power battery is lower than the preset charge level, and the difference between the current maximum discharge power of the power battery and the required power of the driving motor is greater than the required power of the starter.
Fig. 3 is a flowchart illustrating another method for controlling the engine start of the extended range electric vehicle according to the embodiment of the present invention.
As shown in fig. 3, the battery management system BMS sends the acquired maximum discharge power to the vehicle control unit VCU; an accelerator pedal opening sensor arranged on an accelerator pedal collects an accelerator pedal opening signal and sends the accelerator pedal opening signal to a vehicle control unit VCU; the wheel speed sensor collects a wheel speed signal, the wheel speed signal is converted by the ESC controller to obtain a vehicle speed signal, and the vehicle speed signal is sent to a vehicle control unit VCU; the VCU calculates the required torque of the driving motor, namely the required power of the driving motor according to the speed signal and the opening degree signal of the accelerator pedal and based on a preset parameter mapping relation; the method comprises the following steps that a starter control unit GCU sends the required power of a starter for controlling the starting of an engine to a vehicle control unit VCU; judging whether the engine reaches the starting time or not; if the engine starting command arrives, sending the engine starting command to a starter control unit GCU; the starter control unit GCU executes the start command to control the engine to start.
As shown in fig. 4, an embodiment of the present invention further provides a control device 400 for starting an engine of an extended range electric vehicle, which is applied to a vehicle control unit, and the device includes:
the starting control module 410 controls the engine to start when the residual charge state of the power battery is lower than the preset charge level and the difference value between the current maximum discharge power of the power battery and the required power of the driving motor is larger than the required power of the starter.
In some embodiments, the apparatus further comprises: the first obtaining module 402 obtains the current maximum discharging power of the power battery, and sends the current maximum discharging power to a vehicle control unit.
In some embodiments, the apparatus further comprises: the second obtaining module 404 obtains a required power of a starter, and sends the required power to a vehicle control unit, wherein the required power is a power required for starting the engine.
In some embodiments, the apparatus further comprises: the third obtaining module 406 obtains a vehicle speed signal and an accelerator pedal opening degree signal, and determines the required power of the driving motor according to the vehicle speed signal and the accelerator pedal opening degree signal.
In some embodiments, the apparatus further comprises: the fourth acquisition module 408 acquires a remaining state of charge of the power battery.
Fig. 5 is a hardware architecture diagram of an electronic device 500 according to an embodiment of the present invention. Referring to fig. 5, the electronic device 500 includes: a machine-readable storage medium 501 and a processor 502, and may further include a non-volatile storage medium 503, a communication interface 504, and a bus 505; the machine-readable storage medium 501, the processor 502, the non-volatile storage medium 503, and the communication interface 504 are in communication with each other via a bus 505. The processor 502 may perform the control method described in the above embodiments for extended range electric vehicle engine start by reading and executing machine executable instructions for the control of extended range electric vehicle engine start in the machine readable storage medium 501.
A machine-readable storage medium as referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: a RAM (random Access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof.
The non-volatile medium may be non-volatile memory, flash memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, dvd, etc.), or similar non-volatile storage medium, or a combination thereof.
It can be understood that, for the specific operation method of each functional module in this embodiment, reference may be made to the detailed description of the corresponding step in the foregoing method embodiment, and no repeated description is provided herein.
The computer-readable storage medium provided in the embodiments of the present invention stores a computer program, and when executed, the computer program code may implement the method for controlling engine start of an extended range electric vehicle according to any of the embodiments described above, and specific implementation may refer to the method embodiments, and will not be described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (6)
1. A control method for starting an engine of an extended range electric vehicle is characterized by being applied to a vehicle control unit, and comprises the following steps:
when the residual charge state of the power battery is lower than a preset charge level, and under the condition that the difference value between the current maximum discharge power of the power battery and the required power of the driving motor is larger than the required power of the starter, controlling the engine to start;
the method further comprises the following steps:
acquiring the current maximum discharge power of the power battery, and sending the current maximum discharge power to a finished automobile control unit;
acquiring required power of a starter, and sending the required power to a vehicle control unit, wherein the required power is required power for starting the engine;
acquiring a vehicle speed signal and an accelerator pedal opening degree signal;
determining the required power of the driving motor according to the vehicle speed signal and the accelerator pedal opening degree signal;
calculating the required power of the driving motor based on a preset parameter mapping relation;
and under the condition that the engine starting time is reached, sending a starting signal to a starter control unit to start the engine.
2. The method of claim 1, wherein the step of obtaining the accelerator opening signal comprises:
an accelerator pedal opening degree signal is collected through an accelerator pedal opening degree sensor, and the signal is sent to the whole vehicle control unit.
3. The method of claim 1, wherein the step of obtaining the vehicle speed signal comprises:
collecting a wheel speed signal through a vehicle wheel speed sensor, and sending the wheel speed signal to a vehicle stability system ESC controller so that the vehicle stability system ESC controller converts the wheel speed signal into a vehicle speed signal;
and receiving the vehicle speed signal sent by the ESC controller of the vehicle stability system through a CAN network.
4. The utility model provides a controlling means that extended range electric motor car engine started which characterized in that is applied to whole car the control unit, the device includes:
the starting control module is used for controlling the engine to start when the residual charge state of the power battery is lower than the preset charge level and the difference value between the current maximum discharge power of the power battery and the required power of the driving motor is larger than the required power of the starter;
the first acquisition module is used for acquiring the current maximum discharge power of the power battery and sending the current maximum discharge power to a whole vehicle control unit;
the second acquisition module is used for acquiring the required power of the starter and sending the required power to a whole vehicle control unit, wherein the required power is the power required by starting the engine;
the third acquisition module acquires a vehicle speed signal and an accelerator pedal opening degree signal; determining the required power of the driving motor according to the vehicle speed signal and the accelerator pedal opening degree signal; calculating the required power of the driving motor based on a preset parameter mapping relation;
and the starting control module is also used for sending a starting signal to a starter control unit to start the engine under the condition that the starting time of the engine is reached.
5. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 3 when executing the computer program.
6. A machine-readable storage medium having stored thereon machine-executable instructions which, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any one of claims 1 to 3.
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