WO2017113939A1

WO2017113939A1 - Range extended electric vehicle and engine starting control method therefor, and system

Info

Publication number: WO2017113939A1
Application number: PCT/CN2016/102595
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: 2015-12-30
Filing date: 2016-10-19
Publication date: 2017-07-06
Also published as: CN105774571B; CN105774571A

Abstract

An engine starting control method for a range extended electric vehicle, and a system for running the method. The control method comprises: when a range extender is in a stopped working condition, an APU acquiring the states of an engine emergency stop command, an engine stop command and an engine starting command; the APU determining whether the engine emergency stop command is not enabled, whether the engine stop command is not enabled, and whether the engine starting command is received; if the engine emergency stop command is not enabled, the engine stop command is not enabled and the engine starting command is received, the APU further determining whether the number of times of starting failure is less than an allowed threshold value of the number of times of starting failure; and if the APU determines that the number of times of starting failure is less than the allowed threshold value of the number of times of starting failure, switching the range extender to a start working condition. According to the engine starting control method, when engine starting control is performed, whether a stop demand or starting failure exists is detected, a timely response to a vehicle control unit is guaranteed, and the safety of parts that may fail is guaranteed.

Description

Extended-range electric vehicle and engine starting control method and system thereof

Technical field

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

Background technique

In the related art, an extended-range electric vehicle has a simple factor to consider when starting control of the engine, and cannot respond according to some requirements in the starting process (for example, a shutdown requirement, etc.), thereby resulting in an increased use experience of the extended-range electric vehicle. good.

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, an object of the present invention is to provide an engine start control method for an extended-range electric vehicle, which detects whether there is a shutdown demand or a start failure during engine start control, and if not, controls the range extender to switch to Start-up conditions, if any, prohibit the engine from starting, control the range extender to maintain the shutdown condition, to ensure timely response to the vehicle control unit, to ensure the safety of components that may be faulty.

A second object of the present invention is to provide an engine start control system for an extended-range electric vehicle.

A third object of the present invention is to provide an extended-range electric vehicle.

In order to achieve the above object, an engine start control method for an extended-range electric vehicle according to an embodiment of the present invention, the engine start control system of the extended-range electric vehicle includes a vehicle control unit VCU, an engine control unit EMS, and a generator control unit a GCU, a range extender control unit APU, a generator, and an engine, the method comprising the steps of: obtaining, when the range extender is in a shutdown condition, a state of an engine emergency stop command, an engine stop command, and an engine start command; Determining, by the APU, whether the engine emergency stop command is not enabled, whether the engine stop command is not enabled, and whether the engine start command is received; if the engine emergency stop command is not enabled, the engine stop command If the engine start command is not enabled and received, the APU further determines whether the number of start failures is less than a start failure number allowable threshold; if the APU determines that the number of start failures is less than the start failure number allowable threshold, The range extender switches to a starting condition.

An engine start control method for an extended-range electric vehicle according to an embodiment of the present invention detects whether there is a shutdown requirement or a startup failure when the engine is started, and if not, controls the range extender to switch to a starting condition, and if so, The engine is prohibited from starting, and the range extender is controlled to maintain the shutdown condition to ensure timely response to the vehicle control unit and to ensure the safety of components that may malfunction.

In an embodiment of the invention, the method further includes: if the engine emergency stop command is enabled, the engine stop command is enabled or not received, the APU maintains the range extender For shutdown conditions.

In an embodiment of the present invention, the method further includes: if the APU determines that the number of startup failures is greater than or equal to the number of startup failure permission thresholds, prohibiting the engine from starting and performing a fault reminder.

In an embodiment of the present invention, the method further includes: when the range extender is in a starting condition, the APU determining whether the downtime of the engine is greater than a shutdown hold time threshold; if the APU determines the engine If the shutdown time is greater than the shutdown hold time threshold, the GCU controls the generator to be in the speed control mode to drag the engine; the APU determines whether the generator speed is greater than a drag target speed threshold; The generator speed is greater than the drag target speed threshold, and the APU controls the generator to exit the drag through the GCU; the APU controls the engine to ignite through the EMS.

In an embodiment of the present invention, the method further includes: when the range extender is in a starting condition, the APU acquires a state of an engine emergency stop command, an engine stop command, and an engine start command; the APU determines the engine Whether an emergency stop command is enabled, whether the engine stop command is enabled, or whether the engine start command is not received; if the APU determines that the engine emergency stop command is not enabled and the engine stop command is not enabled and Receiving the engine start command, the APU calculates a start time; the APU determines whether the start time is greater than a start timeout threshold; if the APU determines that the start time is not greater than the start timeout threshold, further determining Whether the engine start is completed; if the APU determines that the engine start is completed, resetting the number of start failures.

In an embodiment of the present invention, the method further includes: if the APU determines that the startup time is greater than the startup timeout threshold, incrementing the number of startup failures by one; and the APU switches the range extender to Downtime conditions.

In an embodiment of the present invention, the method further includes: if the APU determines that the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received, then the range extender is Switch to the shutdown condition.

In order to achieve the above object, an engine starting control system for an extended-range electric vehicle according to a second aspect of the present invention includes: a vehicle control unit VCU, an engine control unit EMS, a generator control unit GCU, a range controller control unit APU, and power generation. And an engine, wherein the VCU, the EMS, the GCU, and the APU are communicably connected by a car CAN network, the generator being respectively connected to the GCU and the engine, the engine and The EMS is connected, wherein the VCU is configured to output an engine emergency stop command, an engine stop command, or an engine start command; the APU is configured to acquire the engine when the range extender of the extended-range electric vehicle is in a shutdown condition a state of the emergency stop command, the engine stop command, and the engine start command, and further determining that the engine emergency stop command is not enabled, the engine stop command is not enabled, and the engine start command is received, further Determining whether the number of startup failures is less than a threshold number of startup failures, and determining that the number of startup failures is less than The extender switching control starting condition to start when said threshold number of failures allowed.

An engine start control system for an extended-range electric vehicle according to an embodiment of the present invention detects whether there is a shutdown requirement or a startup failure when the engine is started, and if not, controls the range extender to switch to a starting condition, and if so, The engine is prohibited from starting, and the range extender is controlled to maintain the shutdown condition to ensure timely response to the vehicle control unit and to ensure the safety of components that may malfunction.

In an embodiment of the invention, the APU is further configured to control the range extender when determining that the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received. Maintain the shutdown condition.

In an embodiment of the present invention, the APU is further configured to prohibit the engine from starting when determining that the number of start failures is greater than or equal to the number of start failures, and send a fault reminding signal to the VCU.

In an embodiment of the present invention, the APU is further configured to determine whether the downtime of the engine is greater than a shutdown hold time threshold when the range extender is in a starting condition, and determine the downtime of the engine Transmitting a speed control command to the GCU when the shutdown hold time threshold is greater; the GCU is configured to control the generator to be in a speed control mode to drag the engine according to the speed control command; the APU is further used And sending a standby command to the GCU when determining that the generator speed is greater than the drag target speed threshold, so that the GCU controls the generator to exit the drag, and the engine stop request prohibition command and the engine start A request enable command is sent to the EMS to cause the EMS to control the engine to ignite.

In an embodiment of the present invention, the APU is further configured to acquire a state of an engine emergency stop command, an engine stop command, and an engine start command when the range extender is in a starting condition, and determine the engine emergency The stop command is not enabled, and the engine stop command is not enabled and the start time is calculated when the engine start command is received, and further determining whether the engine start is completed when determining that the start time is not greater than a start timeout threshold And resetting the number of start failures when it is determined that the engine start is completed.

In an embodiment of the present invention, the APU is further configured to increase the number of the startup failures by one when determining that the startup time is greater than the startup timeout threshold, and control the range shifter to switch to the shutdown condition.

In an embodiment of the invention, the APU is further configured to switch the range extender when determining that the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received. To the shutdown condition.

In order to achieve the above object, an extended-range electric vehicle according to an embodiment of the third aspect of the present invention includes the engine start control system of the second aspect of the present invention.

The extended-range electric vehicle according to the embodiment of the present invention has the engine starting control system, responds promptly to the shutdown requirement during the starting process, ensures the safety of components that may be malfunctioned, improves the engine starting smoothness, and improves each The engine start-up success rate in the environment enhances the driving experience of the extended-range electric vehicle.

DRAWINGS

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

1 is a block diagram showing an engine start control system of an extended-range electric vehicle according to an embodiment of the present invention;

2A is a flow chart of an engine start control method of an extended-range electric vehicle according to an embodiment of the present invention;

2B is a flow chart of an engine start control method of an extended-range electric vehicle according to an embodiment of the present invention;

3 is a flow chart of an engine start control method of an extended-range electric vehicle according to another embodiment of the present invention;

4 is a flow chart of an engine start control method of an extended-range electric vehicle according to still another embodiment of the present invention.

Reference mark:

The vehicle control unit 100, the range extender control unit 200, the generator control unit 300, the engine control unit 400, the generator 500, and the engine 600.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

The engine starting control method, system and extended-range electric vehicle of the extended-range electric vehicle according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

Among them, as shown in FIG. 1, the engine start control system of the extended-range electric vehicle includes a vehicle control unit VCU, an engine control unit EMS, a generator control unit GCU, a ranger control unit APU, a generator, and an engine. Among them, the engine control unit EMS, the generator control unit GCU, the generator and the engine constitute a range extender.

The VCU, EMS, GCU and APU establish a communication connection through the car CAN network, and the generator and the engine are directly connected.

2A is a flow chart of an engine start control method of an extended-range electric vehicle according to an embodiment of the present invention. As shown in FIG. 2A, the engine start control method of the embodiment of the present invention includes the following steps:

S1, when the range extender is in the shutdown condition, the APU acquires the state of the engine emergency stop command, the engine stop command, and the engine start command.

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

More specifically, the range extender control unit APU acquires the states of the engine emergency stop command, the engine stop command, and the engine start command.

S2, the APU determines whether the engine emergency stop command is not enabled, whether the engine stop command is not enabled, and whether an engine start command is received.

S3. If the engine emergency stop command is not enabled, the engine stop command is not enabled, and the engine start command is received, the APU further determines whether the number of start failures is less than the allowable failure number threshold.

Specifically, when the APU determines that the engine emergency stop command is not enabled, the engine stop command is not enabled, and the engine start command is received, the APU further determines the number of start failures, that is, determines whether the number of start failures is less than the allowable failure number threshold.

S4. If the APU determines that the number of startup failures is less than the threshold of the number of failures to start, the range extender is switched to the startup condition.

Specifically, if the APU determines that the number of startup failures is less than the threshold number of startup failures, the range extender is switched to the startup condition to perform a startup operation.

In one embodiment of the invention, the method further includes: S5, if the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received, the APU maintains the range extender as a shutdown condition.

In an embodiment of the present invention, the method further includes: S6, if the APU determines that the number of startup failures is greater than or equal to the number of activation failures, the engine is disabled and the fault is rectified.

Specifically, if the APU determines that the number of startup failures is greater than or equal to the number of activation failures, the controller is considered to have a startup failure, prohibits the engine from starting again, and feeds back the engine startup failure to the vehicle control unit, and the vehicle control unit receives the VCU. After this signal, the engine start command is no longer sent. Only after the vehicle is powered on again, the controller APU will reset the fault flag and the number of failed starts, and the vehicle control unit VCU resends the engine start command.

Specifically, as shown in FIG. 2B, in a specific embodiment of the present invention, the engine start control method includes the following steps:

S201, the process unit is in a shutdown condition.

Specifically, the stroker is allowed to start only when the stroke is in the stop state, that is, the engine is in the stop state and the generator is in the standby state.

S202, the vehicle control unit starts and stops the control command judgment.

Specifically, the APU determines whether the engine emergency stop command is not enabled, the engine stop command is not enabled, and the engine start command enables three conditions simultaneously (ie, whether emergency stop = 0 & & stop = 0 & & start = 1 is satisfied), and if so, Then jump to S203; otherwise, jump to S206.

S203, determining the number of failed failures. That is, it is judged whether the number of engine start failures is less than the threshold of the number of start failures.

Specifically, when the number of engine start failures is less than the start failure allowable number threshold, the process jumps to S204; otherwise, the process jumps to S205.

S204, the process state is switched to the starting condition, and the starting operation is performed.

S205, prohibiting the engine from starting, and feeding back the "starting fault" to the vehicle control unit.

Specifically, when the number of engine start failures is greater than or equal to the threshold of the number of start failures, it is considered that there is a start failure of the process, the engine is prohibited from starting again, and the engine start failure is fed back to the vehicle control unit, and the vehicle control unit receives the signal. After that, the engine start command is no longer sent. Only after the whole vehicle is powered on again, the controller control unit will reset the fault flag and the number of start failures, and the vehicle control unit resends the engine start command.

At S206, the process unit is kept in a stopped state.

The engine starting control method according to the embodiment of the present invention detects whether there is a shutdown requirement or a starting failure when the engine is started, and if not, controls the range extender to switch to the starting condition, and if so, prohibits the engine from starting, and controlling the extended range. The machine maintains a shutdown condition to ensure timely response to the vehicle control unit and to ensure the safety of components that may be malfunctioning.

Next, an engine starting process in a starting condition of an embodiment of the present invention will be described.

In an embodiment of the present invention, the engine start control method further includes: when the range extender is in the starting condition, the APU determines whether the engine down time is greater than the stop hold time threshold; if the APU determines that the engine down time is greater than the stop hold time Threshold, the GCU controls the generator to be in the speed control mode to drag the engine; the APU determines whether the generator speed is greater than the drag target speed threshold; if it is judged that the generator speed is greater than the drag target speed threshold, the APU controls the generator to exit through the GCU Drag; APU controls engine ignition through EMS.

Specifically, as shown in FIG. 3, in an embodiment of the present invention, the engine start control method further includes the following steps:

S301, the range extender is in a starting condition.

S302, the APU performs the stop and keeps timing. That is, the APU counts engine downtime.

Specifically, when the range extender is in the starting condition, the stop state is maintained. 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 process is in a stable shutdown state before the engine is started.

S303. The APU determines whether the engine down time is greater than a shutdown hold time threshold. If yes, go to S304, otherwise go back to S302.

S304. If the APU determines that the engine down time is greater than the shutdown hold time threshold, the GCU controls the generator to be in the speed control mode to drag the engine.

Specifically, if the APU determines that the engine down time is greater than the shutdown hold time threshold, then the stop is maintained When the state is completed, then the APU controls the generator speed to drive the engine.

More specifically, the APU sends a speed control command to the generator control unit GCU, which operates the ISG (ie, the ISG in FIG. 1) in the speed control mode to drag the engine.

Among them, the engine drag target speed threshold considers the following factors: First, it is higher than the engine resonance zone speed to avoid excessive engine vibration during starting; secondly, reference to the engine control unit EMS according to current ambient temperature, atmospheric pressure and other factors The engine idle speed target speed is comprehensively judged. The engine drag target speed threshold takes the maximum value of each of the above speeds. The generator control unit GCU controls the generator ISG to operate in the speed control mode according to the engine drag target speed threshold, and drags the engine directly connected with 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 of the ISG and the engine from appearing during the starting process, the damage of the stroker occurs, and the speed control process The maximum output torque of the generator is limited. In addition, the APU uses the generator limit power sent by the vehicle control unit VCU as the maximum output torque limiting factor to ensure vehicle driving performance and battery reliability. The APU compares the torque value calculated from the maximum output power of the generator sent by the VCU with the calibrated maximum output torque value of the generator, taking the smaller value as the absolute value of the maximum torque that allows the generator to output.

S305: The APU determines whether the generator speed is greater than a drag target speed threshold. If yes, execute S306, if no, return to S305 to continue the determination.

Specifically, the APU also monitors the generator speed to determine whether the generator speed reaches the engine drag target speed threshold.

S306. If it is determined that the generator speed is greater than the drag target speed threshold, the APU controls the generator to exit the drag through the GCU.

Specifically, when it is determined that the generator speed is greater than the engine drag target speed threshold, it is determined that the engine drag is completed, then the APU controls the generator to exit the drag through the GCU. After the generator drags the engine to the target speed, the generator immediately exits and drags, avoiding excessive vibration between the engine and the generator. The engine and generator may have excessive reverse force, resulting in engine and power generation. Possible breakage of the machine connection structure.

More specifically, when it is determined that the generator speed is greater than the engine drag target speed threshold, the APU sends a standby command, the generator target speed is 0 to the GCU, and the GCU controls the ISG to enter the standby and rotate state, and exits the drag engine.

S307, the APU controls engine ignition through the EMS.

Specifically, the APU requests to start the engine and perform fuel injection ignition control.

More specifically, the APU sends an engine shutdown request inhibit and an engine start request enable to the engine control unit EMS, which controls the engine fuel injection ignition.

S308. The APU determines whether the startup is completed. If yes, it ends, if no, it returns to S308 to continue the judgment.

Specifically, the APU monitors the engine start success flag of the EMS feedback in real time, and when it is detected that the launch start success flag is enabled, determines that the engine start is successful; otherwise, continues to wait for the engine start success flag position.

In the engine starting control method of the embodiment of the invention, before the generator drives the engine, the engine stop state is maintained and judged to ensure the engine safety when the fuel injection is ignited; the engine drag target speed threshold selection strategy is selected to ensure the engine start Ride smoothness, which improves the engine start success rate under various environments; limits the maximum output torque of the generator during the speed control process to avoid the damage of the turret; the generator limit power sent by the vehicle control unit is taken as The maximum output torque limiting factor ensures vehicle driving performance and battery reliability.

Next, a description will be given of a case where the engine starting is suspended under the starting condition of an embodiment of the present invention. Among them, the factors that can suspend the engine start-up mainly include the shutdown demand and the start timing timeout during the starting process. When these two conditions are met, the engine starting process is aborted. The details will be described below.

In an embodiment of the present invention, the method further includes: when the range extender is in the starting condition, the APU acquires the state of the engine emergency stop command, the engine stop command, and the engine start command; and the APU determines whether the engine emergency stop command is enabled, and the engine Whether the stop command is enabled or not received the engine start command; if the APU determines that the engine emergency stop command is not enabled and the engine stop command is not enabled and receives the engine start command, the APU calculates the start time; the APU determines whether the start time is greater than The start timeout threshold; if the APU determines that the start time is not greater than the start timeout threshold, further determining whether the engine start is completed; if the APU determines that the engine start is completed, resetting the number of start failures.

Wherein, if the APU determines that the starting time is greater than the starting timeout threshold, the number of starting failures is increased by one, and the range extender is switched to the shutdown condition.

In addition, if the APU determines that the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received, the range extender is switched to the shutdown condition.

Specifically, as shown in FIG. 4, in an embodiment of the present invention, the engine start control method further includes the following steps:

S401, the range extender is in a starting condition.

S402, the range extender control unit determines the shutdown requirement.

Specifically, the APU acquires the status of the engine emergency stop command, the engine stop command, and the engine start command. When the range extender is in the starting condition, the APU makes a judgment on the shutdown demand, which is performed in real time during the starting process. Among them, emergency stop=1 means engine emergency stop command is enabled, emergency stop=0 means engine emergency stop command is not enabled; stop=1 means engine stop command is enabled, stop=0 means engine stop command is not enabled; start= 1 represents receipt of an engine start command, and start = 0 represents that an engine start command has not been received.

More specifically, during the engine starting process, the shutdown demand judgment is made, and the APU detects whether the engine emergency stop command, the engine stop command, and the engine start command satisfy one of the following three conditions: the engine emergency stop command enable, the engine stop command enables The engine start command can or cannot be received. If yes, it is determined that the vehicle control unit VCU has a shutdown requirement, then the process goes to step S408, otherwise, step S403 is performed.

S403, starting time timing.

Specifically, when the APU detects that the engine emergency stop command is not enabled, and the engine stop command is not enabled, and the engine start command is enabled (ie, the engine start command is received) (ie, emergency stop=0 and stop=0 and start) =1), the APU determines that there is no need for stopping during the starting process, and then calculates the starting time. This step is performed in real time during the start-up process. During the starting process, the total starting time is counted.

S404, the start time is timed out. That is, the APU determines whether the startup time is greater than the startup timeout threshold.

Specifically, the APU performs a start timeout determination, which is performed in real time during the startup process. That is, the APU determines whether the startup time exceeds the startup timeout threshold. If it is determined that the startup time is greater than the startup timeout threshold, then S405 is performed; if it is determined that the startup time is not greater than the startup timeout threshold, then S406 is performed.

S405. If the startup time is greater than the startup timeout threshold, determine that the startup fails, and increase the number of startup failures by one. After executing S405, S408 is executed.

At S406, it is determined whether the engine start is completed. If it is completed, S407 is executed, and if it is not completed, it returns to S401 to execute cyclically.

Specifically, if the APU determines that the starting time is not greater than the starting timeout threshold, it is further determined whether the engine starting is completed.

More specifically, the APU monitors the engine start success flag fed back by the engine control unit EMS in real time, and determines that the engine start is successful when it is detected that the launch start success flag is enabled.

S407. If the APU determines that the engine start is completed, resets the number of start failures.

Specifically, when the APU determines that the engine start is completed, the number of start failures is reset. So as not to affect the next engine start judgment.

S408, the APU switches the range extender to the shutdown condition.

Specifically, the APU controls the range extender to enter a shutdown state, waiting for the next start command.

In order to implement the above embodiment, the present invention also proposes an engine start control system for an extended-range electric vehicle.

As shown in FIG. 1 , an engine start control system for an extended-range electric vehicle according to an embodiment of the present invention includes: a vehicle control unit (VCU) 100, a range extender control unit (APU) 200, and a generator control unit (GCU) 300. An engine control unit (EMS) 400, a generator 500 (i.e., an ISG in FIG. 1), and an engine 600. The vehicle control unit 100, the range extender control unit 200, the generator control unit 300, and the engine control unit 400 are communicably connected by a car CAN network, and the generator 500 is connected to the generator control unit 300 and the engine 600, respectively. Engine 600 is coupled to engine control unit 400.

Among them, the engine control unit 400, the generator control unit 300, the generator 500, and the engine 600 constitute a range extender. The generator 500 and the engine 600 are directly connected together.

The vehicle control unit 100 is configured to output an engine emergency stop command, an engine stop command, or an engine start command.

Specifically, the vehicle control unit 100 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 200 is configured to acquire the states of the engine emergency stop command, the engine stop command, and the engine start command when the range extender of the extended-range electric vehicle is in the shutdown condition, and determine that the engine emergency stop command is not enabled, When the engine stop command is not enabled and the engine start command is received, it is further determined whether the number of start failures is less than the allowable failure number threshold, and the range extender is switched to the start condition when it is determined that the number of start failures is less than the allowable failure number threshold.

Specifically, the range extender control unit 200 acquires the states of the engine emergency stop command, the engine stop command, and the engine start command. When the range extender control unit 200 determines that the engine emergency stop command is not enabled, the engine stop command is not enabled, and the engine start command is received, the number of start failures is further determined, that is, whether the number of start failures is less than the allowable number of start failures. When it is determined that the number of startup failures is less than the threshold number of startup failures, the range extender is switched to the starting condition to perform a starting operation.

In one embodiment of the present invention, the range extender control unit 200 is further configured to control the range extender to maintain the shutdown condition when determining that the engine 600 emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received. .

In an embodiment of the present invention, the range extender control unit 200 is further configured to prohibit the engine 600 from starting when determining that the number of start failures is greater than or equal to the number of start failures, and send a fault reminding signal to the vehicle control unit 100.

Specifically, if the range extender control unit 200 determines that the number of start failures is greater than or equal to the number of start failures allowable threshold, it is considered that there is a start failure of the flow controller, prohibiting the engine 600 from starting again, and feeding back the engine 600 to the vehicle control unit 100. After the failure, the vehicle control unit 100 does not send the engine 600 start command after receiving the signal. Only after the whole vehicle is powered on again, the controller control unit resets the fault flag and the number of start failures, and the vehicle control unit 100 resends the engine 600 start command.

The engine starting control system of the embodiment of the present invention detects whether there is a shutdown requirement or a starting failure when the engine is started, and if not, controls the range extender to switch to the starting condition, and if so, prohibits the engine from starting, and controlling the extended range. The machine maintains a shutdown condition to ensure timely response to the vehicle control unit and to ensure the safety of components that may be malfunctioning.

Next, the starting process of the engine 600 in the starting condition of one embodiment of the present invention will be described.

In one embodiment of the present invention, the range extender control unit 200 is further configured to determine whether the downtime of the engine 600 is greater than the shutdown hold time threshold when the range extender is in the start condition, and determine that the downtime of the engine 600 is greater than When the shutdown time threshold is reached, the speed control command is sent to the generator control unit 300;

The generator control unit 300 is configured to control the generator 500 to be in the speed control mode according to the speed control command to drive the engine 600;

The range extender control unit 200 is further configured to send a standby command to the generator control unit 300 when determining that the generator 500 speed is greater than the drag target speed threshold, so that the generator control unit 300 controls the generator 500 to exit the drag, and The engine stop request inhibit command and the engine start request enable command are sent to the engine control unit 400 to cause the engine control unit 400 to control the engine 600 to ignite.

Specifically, when the range extender is in the starting condition, the stop state is maintained. Assuming that the engine 600 shutdown is not stable, there may be a rebound phenomenon of the engine 600, and if the fuel injection is performed, the engine 600 may be dangerous or damaged. Therefore, the stop state is maintained for a delay to ensure that the process is in a stable shutdown state before the engine 600 is started.

Further, the range extender control unit 200 determines whether the down time of the engine 600 is greater than the shutdown hold time threshold. If it is determined that the down time of the engine 600 is greater than the shutdown hold time threshold, the shutdown hold state is considered complete, then the range extender control unit 200 performs the generator 500 rotational speed control on the generator 500 to drag the engine 600. The range extender control unit 200 sends a speed control command to the generator control unit 300, which controls the generator 500 (i.e., the ISG in FIG. 1) to operate in the speed control mode to drag the engine 600.

Among them, the engine 600 drag target speed threshold considers the following factors: First, it is higher than the engine 600 resonance zone speed to avoid excessive vibration of the engine 600 during the starting process; secondly, reference to the engine control unit 400 according to the current ambient temperature, the atmosphere The engine 600 idle speed target speed is comprehensively determined by factors such as pressure. The engine 600 drag target speed threshold takes the maximum value of each of the above speeds. The generator control unit 300 controls the generator 500 to operate in the speed control mode in accordance with the engine drag target speed threshold, and drags the engine 600 directly connected to the generator 500 to operate in common.

At the same time, in order to ensure that the generator 500 speed control does not generate excessive torque output, to prevent the generator 500 and the engine 600 from having excessive reverse force during the starting process, resulting in the damage of the stroker, The maximum output torque of the generator 500 during speed control is limited. In addition, the range extender control unit 200 uses the generator limit power transmitted by the vehicle control unit 100 as a maximum output torque limiting factor to ensure vehicle driving performance and battery reliability. The range extender control unit 200 compares the torque value calculated according to the maximum output power of the generator transmitted by the vehicle control unit 100 with the calibrated maximum output torque value of the generator, and takes the smaller value as the output of the generator 500. The absolute value of the maximum torque.

In the engine starting control system of the embodiment of the present invention, before the generator 500 drives the engine 600, the engine 600 is stopped and judged to ensure that the engine 600 is safe when the fuel is ignited; and the engine drag target speed threshold is selected. The engine starting smoothness is ensured, and the engine starting success rate in each environment is improved; the maximum output torque of the generator during the speed control process is limited to avoid the damage of the stroke device; the whole vehicle control unit 100 transmits The generator limit power is used as the maximum output torque limiting factor to ensure the vehicle driving performance and battery reliability.

Next, a description will be given of a case where the engine starting is suspended under the starting condition of an embodiment of the present invention. Among them, able to The starting factor for stopping the engine 600 mainly includes the shutdown demand and the start timing timeout during the starting process. When these two conditions are met, the engine 600 starting process is aborted. The details will be described below.

In one embodiment of the present invention, the range extender control unit 200 is further configured to acquire the state of the engine emergency stop command, the engine stop command, and the engine start command when the range extender is in the starting condition, and determine the engine emergency stop. If the command is not enabled, and the engine stop command is not enabled and the engine start command is received, the start time is calculated, and when it is determined that the start time is not greater than the start timeout threshold, it is further determined whether the engine 600 start is completed, and when it is determined that the engine 600 is started. Reset the number of failed starts.

Specifically, when the range extender is in the starting condition, the range extender control unit 200 performs the stop demand determination, and the range extender control unit 200 detects three conditions of the engine emergency stop command, the engine stop command, and the engine start command. Among them, emergency stop=1 means engine emergency stop command is enabled, emergency stop=0 means engine emergency stop command is not enabled; stop=1 means engine stop command is enabled, stop=0 means engine stop command is not enabled; start= 1 represents receipt of an engine start command, and start = 0 represents that an engine start command has not been received.

More specifically, when it is determined that the emergency stop=0, the stop=0, and the start=1 are satisfied, it is determined that the vehicle control unit 100 does not have a stop demand, and then the start time is counted. When the range extender control unit 200 determines that the start time does not exceed the start time timeout threshold, it is further determined whether the engine 600 start is completed, and if it is determined that the engine 600 is started, the number of start failures is reset.

In one embodiment of the present invention, the range extender control unit 200 is further configured to increase the number of startup failures by one when determining that the startup time is greater than the startup timeout threshold, and control the range extender to switch to the shutdown condition.

In one embodiment of the invention, the range extender control unit 200 is further configured to switch the range extender to the shutdown condition when determining that the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received.

Specifically, when the range controller control unit 200 determines that any one of the three conditions of emergency stop=1, stop=1, and start=0 is satisfied, it is determined that the vehicle control unit 100 has a shutdown requirement, and then the range extender is switched to Downtime conditions.

In order to implement the above embodiment, the present invention also proposes an extended-range electric vehicle. The extended-range electric vehicle includes the engine start control system of the above embodiment.

The extended-range electric vehicle according to the embodiment of the present invention has the engine starting control system, and responds to the shutdown requirement in the starting process in time to ensure the safety of the components that may be malfunctioning; also improves the engine starting smoothness and improves each The engine start-up success rate in the environment enhances the driving experience of the extended-range electric vehicle.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. Must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a The limits of the Ming.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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 is not necessarily directed to 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. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

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 engine start control method for an extended-range electric vehicle, characterized in that the engine start control system of the extended-range electric vehicle includes a vehicle control unit VCU, an engine control unit EMS, a generator control unit GCU, and a range extender control unit. An APU, a generator, and an engine, the engine start control method includes the following steps:

The APU acquires states of an engine emergency stop command, an engine stop command, and an engine start command when the range extender is in a shutdown condition;

Determining, by the APU, whether the engine emergency stop command is not enabled, whether the engine stop command is not enabled, and whether the engine start command is received;

If the engine emergency stop command is not enabled, the engine stop command is not enabled, and the engine start command is received, the APU further determines whether the number of start failures is less than a start failure number allowable threshold;

And if the APU determines that the number of startup failures is less than the start failure number permission threshold, the range extender is switched to a startup condition.
The engine start control method for an extended-range electric vehicle according to claim 1, further comprising:

The APU maintains the range extender as a shutdown condition if the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received.
The engine start control method for an extended-range electric vehicle according to claim 1, further comprising:

If the APU determines that the number of start failures is greater than or equal to the number of start failures allowed threshold, the engine is disabled and a fault reminder is performed.
The engine start control method for an extended-range electric vehicle according to claim 1, further comprising:

When the range extender is in a starting condition, the APU determines whether the downtime of the engine is greater than a shutdown holding time threshold;

If the APU determines that the downtime of the engine is greater than the shutdown hold time threshold, controlling the generator to be in a speed control mode by the GCU to drag the engine;

Determining, by the APU, whether the generator speed is greater than a drag target speed threshold;

If it is determined that the generator speed is greater than the drag target speed threshold, the APU controls the generator to exit the drag through the GCU;

The APU controls the engine ignition by the EMS.
The engine start control method for an extended-range electric vehicle according to claim 1, further comprising:

The APU acquires states of an engine emergency stop command, an engine stop command, and an engine start command when the range extender is in a starting condition;

Determining, by the APU, whether the engine emergency stop command is enabled, whether the engine stop command is enabled, or Did not receive the engine start command;

If the APU determines that the engine emergency stop command is not enabled and the engine stop command is not enabled and receives the engine start command, the APU calculates a start time;

Determining, by the APU, whether the starting time is greater than a startup timeout threshold;

If the APU determines that the starting time is not greater than the starting timeout threshold, further determining whether the engine starting is completed;

If the APU determines that the engine start is completed, the number of start failures is reset.
The engine start control method for an extended-range electric vehicle according to claim 5, further comprising:

If the APU determines that the startup time is greater than the startup timeout threshold, incrementing the number of startup failures by one;

The APU switches the range extender to a shutdown condition.
The engine start control method for an extended-range electric vehicle according to claim 5, further comprising:

If the APU determines that the engine emergency stop command is enabled, the engine stop command is enabled, or the engine start command is not received, the range extender is switched to a shutdown condition.
An engine start control system for an extended-range electric vehicle, comprising: a vehicle control unit VCU, an engine control unit EMS, a generator control unit GCU, a range controller control unit APU, a generator, and an engine, wherein Said VCU, said EMS, said GCU and said APU being communicatively connected by a car CAN network, said generator being respectively connected to said GCU and said engine, said engine being connected to said EMS,

Wherein the VCU is configured to output an engine emergency stop command, an engine stop command or an engine start command;

The APU is configured to acquire a state of the engine emergency stop command, the engine stop command, and the engine start command when a range extender of an extended-range electric vehicle is in a shutdown condition, and determine the engine emergency stop When the command is not enabled, the engine stop command is not enabled, and the engine start command is received, further determining whether the number of start failures is less than a threshold number of start failures, and determining that the number of start failures is less than the number of start failures The threshold is controlled to switch to the starting condition when the threshold is allowed.
The engine start control system for an extended-range electric vehicle according to claim 8, wherein said APU is further configured to: when said engine emergency stop command is enabled, said engine stop command is enabled or not received When the engine start command is described, the range extender is controlled to maintain the shutdown condition.
The engine start control system for an extended-range electric vehicle according to claim 8, wherein the APU is further configured to prohibit the engine from being started when it is determined that the number of start failures is greater than or equal to the start failure number permission threshold. And send a fault reminder signal to the VCU.
An engine start control system for an extended-range electric vehicle according to claim 8, wherein

The APU is further configured to determine whether the downtime of the engine is greater than when the range extender is in a starting condition Stopping the hold time threshold, and sending a speed control command to the GCU when determining that the engine down time is greater than the stop hold time threshold;

The GCU is configured to control the generator to be in a speed control mode to drag the engine according to the speed control command;

The APU is further configured to send a standby command to the GCU when determining that the generator speed is greater than the drag target speed threshold, so that the GCU controls the generator to exit the drag, and the engine shutdown request A disable command and an engine start request enable command are sent to the EMS to cause the EMS to control the engine to ignite.
The engine start control system for an extended-range electric vehicle according to claim 8, wherein said APU is further configured to acquire an engine emergency stop command, an engine stop command, and an engine when said range extender is in a starting condition a state of the start command, and calculating a start time when determining that the engine emergency stop command is not enabled, and the engine stop command is not enabled and receiving the engine start command, and determining that the start time is not greater than a start The timeout threshold further determines whether the engine start is completed, and resets the number of start failures when it is determined that the engine start is completed.
The engine start control system for an extended-range electric vehicle according to claim 12, wherein the APU is further configured to increase the number of the start failures by one when determining that the start time is greater than the start timeout threshold, and Controlling the range extender to switch to a shutdown condition.
The engine start control system for an extended-range electric vehicle according to claim 12, wherein said APU is further configured to determine whether said engine emergency stop command is enabled, said engine stop command is enabled or not received The range extender is switched to a shutdown condition when the engine start command is described.
An extended-range electric vehicle, comprising: the engine start control system according to any one of claims 8-14.