WO2017107677A1

WO2017107677A1 - Starting control method and device for range-extending type electric vehicle range extender

Info

Publication number: WO2017107677A1
Application number: PCT/CN2016/104522
Authority: WO
Inventors: 王金龙; 易迪华; 金硕; 崔天祥; 周金龙
Original assignee: 北京新能源汽车股份有限公司
Priority date: 2015-12-21
Filing date: 2016-11-04
Publication date: 2017-06-29
Also published as: CN105620299B; CN105620299A

Abstract

Provided are a starting control method and device for a range-extending type electric vehicle range extender. The starting control method for the range-extending type electric vehicle range extender comprises: when the range extender is in a starting working condition, monitoring whether a downtime requirement exists or not in a starting process of an engine (26) (S11); and if the downtime requirement exists, suspending the starting of the engine (26) (S12). According to the method, the downtime requirement in the starting process of the engine (26) can be taken into consideration, so that the safety of parts that may fail is guaranteed.

Description

Extended program electric vehicle range extender starting control method and device

Cross-reference to related applications

This application claims the priority of the Chinese Patent Application No. "201510967792.4" filed on December 21, 2015 by Beijing New Energy Automobile Co., Ltd., entitled "Extended Program Electric Vehicle Range Extender Start Control Method and Apparatus".

Technical field

The present invention relates to the field of electric vehicle technology, and in particular, to an extended-range electric vehicle range extender starting control method and apparatus.

Background technique

The electric vehicle is driven by the vehicle power supply, and the motor drives the wheels to drive, which can achieve the purpose of energy saving and emission reduction. In order to improve the cruising range of the electric vehicle, a range extender can be set in the electric vehicle. Typically range extenders include an Integrated Starter Generator (ISG) and an engine. In the extended-range electric vehicle, it is necessary to solve the problem of the start-up of the extended-range electric vehicle range extender.

Some start-up control methods of the range extender in the related art, however, the related art does not consider the shutdown requirement during the engine starting process, and cannot guarantee the safety of components that may malfunction. .

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

To this end, it is an object of the present invention to provide an extended-range electric vehicle range extender start control method that can take into account the need for shutdown during engine starting and to ensure the safety of components that may fail.

Another object of the present invention is to provide an extended-range electric vehicle range extender starting control device.

In order to achieve the above object, an extended-range electric vehicle range extender starting control method according to the first aspect of the present invention includes: when the range extender is in a starting condition, monitoring whether there is a shutdown requirement during the starting process of the engine; If there is a need for shutdown, stop the engine starting.

According to the first aspect of the present invention, the extended-range electric vehicle range extender starting control method, during the engine starting process, monitors whether there is a shutdown requirement, and if there is a stop request, the engine start is aborted, and the shutdown can be ensured. Request timely response to ensure the safety of components that may be malfunctioning.

In order to achieve the above object, an extended-range electric vehicle range extender starting control device according to a second aspect of the present invention includes: a first monitoring module, when the range extender is in a starting condition, during the starting process of the engine , monitor whether there is a need for shutdown; the first stop module is used to stop the engine start when there is a need for shutdown.

The extended-range electric vehicle range extender starting control device proposed by the second aspect of the present invention monitors whether there is a shutdown requirement during the engine starting process, and if there is a stop request, the engine start is suspended, and the timely response to the shutdown demand can be ensured. Ensure the safety of components that may be malfunctioning.

The embodiment of the invention further provides an extended-range electric vehicle range extender starting control device, comprising: one or more processors; a memory; one or more programs, wherein the one or more programs are stored in The memory, when executed by the one or more processors, performs the method of any of the first aspect of the invention.

The embodiment of the present invention further provides a non-volatile computer storage medium, wherein the computer storage medium stores one or more modules, when the one or more modules are executed: performing the present invention The method of any of the first aspect of the invention.

The embodiment of the invention further provides a computer program product, when the instructions in the computer program product are executed by the processor: performing the method according to any of the first aspect of the invention.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic flow chart of an extended-range electric vehicle range extender starting control method according to an embodiment of the present invention;

2 is a schematic structural diagram of a system composed of a range extender control unit and a control object according to an embodiment of the present invention;

3 is a schematic flow chart of starting or stopping an engine in an embodiment of the present invention;

4 is a schematic diagram of an engine starting process in an embodiment of the present invention;

5 is a schematic flow chart of switching an engine from a shutdown condition to a starting condition in an embodiment of the present invention;

6 is a schematic structural diagram of an extended-range electric vehicle range extender starting control device according to another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an extended-range electric vehicle range extender starting control device according to another embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar modules or modules having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative of the invention and are not to be construed as limiting. Rather, the invention is to cover all modifications, modifications and equivalents within the spirit and scope of the appended claims.

1 is a schematic flow chart of a method for controlling an increase of an extended range electric vehicle range extender according to an embodiment of the present invention, the method comprising:

S11: When the range extender is in the starting condition, during the starting process of the engine, it is monitored whether there is a need for shutdown.

The range extender control unit can monitor the real-time monitoring of the need for shutdown during engine start-up.

As shown in FIG. 2, the system consisting of the range extender control unit and the control object includes a vehicle control unit 21, a range extender control unit 22, a generator control unit 23, an engine control unit 24, an ISG 25, and an engine 26.

Among them, the generator control unit 23 is used to control the ISG 25, and the engine control unit 24 is used to control the engine 26. The vehicle control unit 21, the range extender control unit 22, the generator control unit 23, and the engine control unit 24 communicate via a Controller Area Network (CAN), and the ISG 25 is directly connected to the engine 26.

The vehicle control unit 21 detects all state information necessary for driving the vehicle, and outputs an engine start stop command information including an engine emergency stop command, an engine stop command, an engine start command, and a generator limit power after comprehensive judgment.

The range extender control unit 22 controls the engine start according to the engine start stop command information of the vehicle control unit, and sends the generator state command, the generator target speed command, and the maximum torque absolute value that allows the generator output to the generator control unit 23, The engine stop request, the engine start request are sent to the engine control unit 24, and the engine start fault flag and the range extender condition are fed back to the vehicle control unit 21.

The generator control unit 23 commands the control of the ISG 25 to operate in accordance with the range extender control unit 22.

The engine control unit 24 commands the control of the operation of the engine 26 in accordance with the range extender control unit 22 and feeds back the engine start completion flag to the ranger control unit 22.

Wherein, the range extender control unit can receive the command sent by the vehicle control unit, and monitor whether there is a shutdown requirement according to the received command. When at least one of the following items occurs, determine the need for downtime:

Engine emergency stop command enable, engine stop command enable, and engine start command are not enabled.

S12: If there is a need for shutdown, stop the engine starting.

For example, after the range controller control unit detects that there is a shutdown demand, an engine stop request is sent to the engine control unit, and the engine control unit controls the engine to stop starting according to the engine stop request.

Specifically, referring to FIG. 3, it is a schematic diagram of a process of starting or stopping the engine, including:

S301: The range extender is in a starting condition.

The range extender can initially be in a shutdown condition, and can be switched from a shutdown condition to a starting condition according to some conditions. For the process of switching from the shutdown condition to the starting condition, refer to the subsequent related description.

S302: Determine whether there is a shutdown requirement, and if yes, execute S308; otherwise, execute S303.

The step is executed by the range controller control unit in real time, and the range extender control unit receives the command of the vehicle control unit, and if at least one of the following items is received, it is determined that there is a shutdown requirement:

The engine emergency stop command is enabled, the engine stop command is enabled, and the engine start command is not enabled. In Fig. 3, it is indicated as emergency stop=1, stop=1, start=0.

S303: Start time counting.

This step is performed in real time by the range extender control unit, and the start time is obtained by timing.

S304: Determine whether the startup time is greater than a startup timeout threshold. If yes, execute S305; otherwise, execute S306.

S305: Determine the start failure, and count the number of start failures to facilitate the engine start failure judgment.

S306: Determine whether the engine start is completed, and if yes, execute S307, otherwise repeat S306.

The range extender control unit monitors the engine start success flag returned by the engine control unit in real time, and determines that the engine start is successful when it is detected that the start start success flag is enabled.

S307: The start is successful, and the number of start failures is reset to zero, so as not to affect the next engine start judgment.

S308: Enter the shutdown condition and wait for the next start command.

In some embodiments, referring to FIG. 4, the engine starting process may include:

S401: The range extender is in a starting condition.

S402: Maintain the engine stop state and time the stop state.

Assuming that the engine shutdown is not stable, engine bounce may occur. At this time, if the fuel is ignited, it may cause danger or damage to the engine. Therefore, the stop state is kept delayed to ensure that the range extender is in a stable shutdown state before the engine is started.

S403: Determine whether the shutdown hold time is greater than the shutdown hold time threshold. If yes, execute S404; otherwise, execute S402 repeatedly.

S404: Generator speed control, drag the engine.

The range extender control unit sends a speed control command to the generator control unit, and the generator control unit controls the ISG to operate in the speed control mode.

The threshold value of the engine drag target speed is considered as follows: First, it is higher than the engine resonance zone speed to avoid excessive engine vibration during the starting process; secondly, the engine control unit should be comprehensively judged according to the current ambient temperature and atmospheric pressure. The engine idles the target speed. The engine drag target speed threshold takes a larger value of the above two speeds. The generator control unit controls the ISG to operate in the speed control mode according to the engine drag target speed threshold, and drags the engine directly connected to the ISG.

At the same time, in order to ensure that the ISG speed control does not produce excessive torque output, in order to prevent the reverse force acting on the ISG and the engine during the starting process, the damage of the range extender occurs, during the speed control process. The maximum output torque of the generator is limited. In addition, the generator limit power sent by the vehicle control unit is used as the maximum output torque limiting factor to ensure the vehicle driving performance and battery reliability. The range extender control unit compares the maximum output power of the generator controller into a torque value and a calibrated maximum output torque value of the generator, and takes the smaller value as the absolute value of the maximum torque that allows the generator to output.

S405: Monitor the generator speed, determine whether the generator speed is greater than the engine drag target speed threshold, and if yes, execute S406, otherwise execute S405 repeatedly.

S406: Request to start the engine to perform fuel injection ignition control.

The range extender control unit transmits an engine stop request inhibition and an engine start request enable to the engine control unit, and the engine control unit controls the engine fuel injection ignition.

S407: It is judged whether the engine is started up, and if so, S408 is executed, otherwise, S407 is repeatedly executed.

S408: The generator exits the drag.

After the engine is successfully started, the range extender control unit sends a standby command, the generator target speed is 0 to the generator control unit, and the generator control unit controls the ISG to enter the standby state, and exits the engine.

In some embodiments, referring to FIG. 5, the process of switching the engine from the shutdown condition to the starting condition may include:

S501: The range extender is in a shutdown condition.

The range extender is allowed to start only when the range extender is in the stop state, ie the engine is in the stop state and the ISG is in the standby state.

S502: Monitor whether there is a starting requirement, if yes, execute S503, otherwise execute S506.

The range extender control unit may receive a command sent by the vehicle control unit 100 to determine a starting requirement when the following conditions are met:

The engine emergency stop command is not enabled, the engine stop command is not enabled, and the engine start command is enabled.

S503: Determine whether the number of engine start failures is less than a threshold number of start failures, and if so, execute S504, otherwise execute S505.

S504: The range extender is switched from the shutdown condition to the starting condition to perform the starting operation.

S505: Start is prohibited, and “start fault” is fed back.

The range extender control unit determines that the range extender has a start fault when the number of engine start failures is greater than the start failure allowable number threshold, prohibits the engine from starting again, and feeds back the engine start fault to the vehicle control unit, and the vehicle control unit receives the After the signal, the engine start command is no longer sent. The extender control unit resets the fault flag and the number of start failures only after the vehicle is powered back on, and the vehicle control unit resends the engine start command.

S506: The range extender remains in a stopped state.

In this embodiment, during the engine start control process, the vehicle control unit is monitored in real time for the need of shutdown. If the vehicle control unit has a stop request, the engine start is aborted to ensure timely response to the vehicle control unit to ensure that a possible occurrence may occur. The faulty component is safe. Before the generator drives the engine, the engine stop state is maintained to ensure the engine safety when the fuel is ignited. The engine drag target speed threshold takes a larger value of the engine resonance zone speed and the engine idle speed target speed, which not only ensures the engine start smoothness, but also improves the engine start success rate in each environment. Limit the maximum output torque of the generator during the speed control process to ensure that the ISG speed control does not generate excessive torque output, so as to avoid excessive reverse force between the ISG and the engine during the starting process, resulting in an extended range. Damage to the device occurs. In addition, the generator limit power sent by the vehicle control unit is used as the maximum output torque limiting factor to ensure the vehicle driving performance and battery reliability. After the engine is started, the generator will exit and drag, ensuring the engine start success rate, avoiding the generator exiting too early, causing the engine speed to fall too fast and difficult to start; the generator immediately exits and drags after the engine starts successfully, avoiding If the vibration between the engine and the generator is too large, the reverse force of the engine and the generator may be excessive, resulting in possible fracture of the engine and generator connection structure.

FIG. 6 is a schematic structural diagram of an extended-range electric vehicle range extender starting control device according to another embodiment of the present invention. The device 60 includes a first monitoring module 601 and a first suspension module 602.

The first monitoring module 601 is configured to monitor whether there is a shutdown requirement during the starting process of the engine when the range extender is in the starting condition.

The first monitoring module is specifically used to:

When at least one of the following items is monitored, it is determined that there is a need for downtime:

Engine emergency stop command is enabled;

Engine stop command is enabled;

The engine start command is not enabled.

The first suspension module 602 is configured to suspend engine starting when there is a need for shutdown.

In some embodiments, referring to FIG. 7, the apparatus 60 further includes:

The first timing module 603 is configured to time the starting time when there is no need for stopping;

The second suspension module 604 is configured to suspend engine starting when the timed start time is greater than the start time timeout threshold.

In some embodiments, referring to FIG. 7, the apparatus 60 further includes:

The second timing module 605 is configured to maintain the engine stop state when the engine is started when the range extender is in the starting condition, and time the stop state;

The dragging module 606 is configured to control the generator speed and drag the engine when the timed stop holding time is greater than the stopping holding time threshold;

The starting module 607 is configured to request engine starting when the generator speed is greater than the engine drag target speed threshold.

The engine drag target speed threshold is a larger value among the engine resonance zone speed and the engine idle target speed.

The absolute value of the maximum torque output by the generator during the speed control is: a smaller value of the torque value calculated from the maximum output power of the generator output by the vehicle control unit and the calibrated maximum output torque value of the generator.

In some embodiments, referring to FIG. 7, the apparatus 60 further includes:

The dragging module 608 is exited for determining whether the engine is started, and when the starting is completed, the generator exits the dragging.

In some embodiments, referring to FIG. 7, the apparatus 60 further includes:

The second monitoring module 609 is configured to monitor whether there is an engine starting requirement when the range extender is in a shutdown condition.

The second monitoring module is specifically configured to: when monitoring the following items simultaneously, determine that there is an engine starting requirement:

The engine emergency stop command is not enabled;

Engine stop command is not enabled;

The engine start command is enabled.

The switching module 610 is configured to switch the range extender from the shutdown condition to the starting condition when there is a starting requirement and the number of engine starting failures is less than the threshold of the number of starting failures.

For the specific content of each module in this embodiment, refer to the related description in the foregoing method embodiments, and details are not described herein again.

In this embodiment, during the engine start control process, the vehicle control unit is monitored in real time for the need of shutdown. If the vehicle control unit has a stop request, the engine start is aborted to ensure timely response to the vehicle control unit. Should ensure the safety of components that may be malfunctioning. Before the generator drives the engine, the engine stop state is maintained to ensure the engine safety when the fuel is ignited. The engine drag target speed threshold takes a larger value of the engine resonance zone speed and the engine idle speed target speed, which not only ensures the engine start smoothness, but also improves the engine start success rate in each environment. Limit the maximum output torque of the generator during the speed control process to ensure that the ISG speed control does not generate excessive torque output, so as to avoid excessive reverse force between the ISG and the engine during the starting process, resulting in an extended range. Damage to the device occurs. In addition, the generator limit power sent by the vehicle control unit is used as the maximum output torque limiting factor to ensure the vehicle driving performance and battery reliability. After the engine is started, the generator will exit and drag, ensuring the engine start success rate, avoiding the generator exiting too early, causing the engine speed to fall too fast and difficult to start; the generator immediately exits and drags after the engine starts successfully, avoiding If the vibration between the engine and the generator is too large, the reverse force of the engine and the generator may be excessive, resulting in possible fracture of the engine and generator connection structure.

The embodiment of the invention further provides an extended-range electric vehicle range extender starting control device, comprising: one or more processors; a memory; one or more programs, wherein the one or more programs are stored in In the memory, when executed by the one or more processors, performing the following steps: when the range extender is in the starting condition, during the starting process of the engine, monitoring whether there is a shutdown requirement; if there is a shutdown requirement, Stop the engine start.

The embodiment of the present invention further provides a non-volatile computer storage medium, wherein the computer storage medium stores one or more modules, and when the one or more modules are executed, performing the following steps: When the range extender is in the starting condition, during the starting process of the engine, it is monitored whether there is a shutdown requirement; if there is a shutdown requirement, the engine is started.

The embodiment of the invention further provides a computer program product, when the instructions in the computer program product are executed by the processor, performing the following steps: when the range extender is in the starting condition, during the starting process of the engine, monitoring Is there a need for downtime; if there is a need for downtime, stop the engine starting.

It should be noted that in the description of the present invention, the terms "first", "second" and the like are used for descriptive purposes only, and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise stated.

Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a particular logical function or process. And the scope of the preferred embodiments of the invention includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in an opposite order depending on the functions involved, in the order shown or discussed. It will be understood by those skilled in the art to which the embodiments of the present invention pertain.

It should be understood that portions of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above In this manner, multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

One of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.

The above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

An extended program electric vehicle range extender starting control method, comprising:

When the range extender is in the starting condition, during the starting process of the engine, it is monitored whether there is a need for shutdown;

If there is a need for shutdown, stop the engine starting.
The method of claim 1 wherein said monitoring includes a need for downtime, including:

When at least one of the following items is monitored, it is determined that there is a need for downtime:

Engine emergency stop command is enabled;

Engine stop command is enabled;

The engine start command is not enabled.
The method of any of claims 1-2, further comprising:

Count the start time when there is no need for downtime;

If the timed start time is greater than the start time timeout threshold, the engine start is aborted.
The method according to any one of claims 1 to 3, further comprising:

When the range extender is in the starting condition, the engine is stopped when the engine is started, and the stop state is timed;

If the timed hold time is greater than the stop hold time threshold, the generator speed is controlled and the engine is dragged;

If the generator speed is greater than the engine drag target speed threshold, the engine is requested to start.
The method of claim 4 wherein said engine drag target speed threshold is a greater of an engine resonance zone speed and an engine idle target speed.
The method according to any one of claims 4-5, wherein the absolute value of the maximum torque output by the generator during the speed control is calculated based on the maximum output power of the generator output by the vehicle control unit. The smaller of the torque value and the calibrated maximum output torque value of the generator.
The method of any of claims 4-6, further comprising:

Determine whether the engine is started or not;

If the start is completed, the generator exits the drag.
The method of any of claims 1-7, further comprising:

Monitor the presence of engine start requirements when the range extender is in a shutdown condition;

If there is a starting demand and the number of engine starting failures is less than the threshold of the number of starting failures allowed, the range extender is switched from the shutdown condition to the starting condition.
The method of claim 8 wherein said monitoring monitors for the presence of an engine start request include:

When it is monitored that the following items are simultaneously met, it is determined that there is an engine starting requirement:

The engine emergency stop command is not enabled;

Engine stop command is not enabled;

The engine start command is enabled.
An extended-range electric vehicle range extender starting control device, comprising:

The first monitoring module is configured to monitor whether there is a shutdown requirement during the starting process of the engine when the range extender is in the starting condition;

The first abort module is used to suspend engine starting when there is a need for shutdown.
The device according to claim 10, further comprising:

a first timing module for timing the start time when there is no need for shutdown;

The second suspension module is configured to suspend engine starting when the timed start time is greater than the start time timeout threshold.
The device according to any one of claims 10-11, further comprising:

a second timing module, configured to maintain an engine stop state when the engine is started when the range extender is in a starting condition, and to time the stop state;

Dragging the module to control the generator speed and drag the engine when the timed hold time of the stop is greater than the stop hold time threshold;

The starting module is configured to request engine starting when the generator speed is greater than the engine drag target speed threshold.
The device according to claim 12, further comprising:

Exit the drag module to determine whether the engine is started or not, and when the start is completed, the generator exits the drag.
The device according to any one of claims 10-13, further comprising:

a second monitoring module, configured to monitor whether there is an engine starting requirement when the range extender is in a shutdown condition;

The switching module is configured to switch the range extender from the shutdown condition to the starting condition when there is a starting requirement and the number of engine starting failures is less than the threshold of the number of starting failures allowed.
An extended-range electric vehicle range extender starting control device, comprising:

One or more processors;

Memory

One or more programs, the one or more programs being stored in the memory, when executed by the one or more processors:

Performing the method of any of claims 1-9.
A non-volatile computer storage medium characterized in that the computer storage medium stores one or more modules when the one or more modules are executed:

Performing the method of any of claims 1-9.
A computer program product when instructions in the computer program product are executed by a processor:

Performing the method of any of claims 1-9.