TWI660117B - Vehicle crankshaft positioning system and control method - Google Patents

Abstract

A vehicle crankshaft positioning system and control method. The vehicle crankshaft positioning control method is suitable for a crankshaft positioning control process of an engine, and includes: when a main switch is changed from an on state to an off state, an integrated starter generator controller uses an auxiliary power source to execute an A flameout control program, wherein the flameout control program determines whether an engine speed is less than a crankshaft positioning speed threshold; and if the engine speed is less than the crankshaft positioning speed threshold, the integrated starter generator controller performs a flameout crank positioning A procedure whereby a crankshaft angle falls within a non-compressed stroke.

Description

Vehicle crankshaft positioning system and control method

The invention relates to a crankshaft positioning system and a control method, in particular to a crankshaft positioning system and a control method in a state where a vehicle main switch is turned off.

Referring to FIG. 1, the Republic of China Patent No. I476320 discloses a control method for reducing the starting torque of an engine, which uses an integrated starter and generator (ISG) 14 to make the engine (not shown) turn off when the engine (not shown) is off. The engine is stopped at non-compressed stroke, so the next time the engine is restarted, the torque required to start the engine is reduced. The integrated starter generator 14 is electrically connected to the battery 15 and the integrated starter controller 13.

Since the operation of the four-stroke engine includes four strokes including intake, compression, explosion, and exhaust, the range of the crankshaft angle of the crankshaft (not shown) is 720 °. In order to determine which stroke the engine is in, the integrated starter generator controller 13 must read the intake pressure from an intake pressure sensor 11 and read the crankshaft position from a crank position sensor 12 to determine the current Crankshaft angle position, the engine can be stopped at the correct crankshaft angle position.

However, the control method for reducing the starting torque of the engine disclosed in the aforementioned Japanese Patent No. I476320 belongs to control after idling and stalling. Since the main switch of the locomotive is still in the ON state when the engine is idling, the battery 15 continues to supply power to the integrated starter generator controller 13 so that the integrated starter controller 13 can continuously perform crankshaft positioning. . However, once the main switch is changed to the off state (Key OFF), the integrated starter generator controller 13 loses power and cannot continue to perform crank positioning. As a result, when the main switch is turned on next time, the crank is not stopped at the optimal position. , So the startability of the engine for the first time is not good. Therefore, it is necessary to find a solution.

Therefore, an object of the present invention is to provide a method for controlling a crankshaft positioning of a vehicle.

Therefore, the method for controlling the crankshaft positioning of a vehicle in the technology according to the first patent application scope of the present invention is applicable to the positioning control process of the crankshaft of an engine, and includes the following steps: (a) providing an integrated starter generator controller, wherein The integrated starter generator controller includes a main switch detection module, an electronic switch, a self-holding power module, and an electrical switch connected to the main switch detection module, the electronic switch and the The processing module of the self-holding power module; (b) when a main switch is changed from the off state to the on state, the main switch detection module generates a main switch conduction message and transmits it to the processing module; (c) In response to the main switch's communication information, the processing module causes the electronic switch to be turned on, so that power from a battery flows through the self-sustaining power module to establish an auxiliary power source; (d) the processing module receives a signal from an engine Start command of the control unit; (e) when the main switch is changed from the on state to the off state, the integrated starter generator controller uses the auxiliary power source to execute a flameout control program, wherein the flameout control program determines a Whether the engine speed is less than a crankshaft positioning speed threshold; and (f) if the engine speed is less than the crankshaft positioning speed threshold, the integrated starter generator controller executes a stalling crankshaft positioning procedure so that a crankshaft angle falls within Within a non-compressed stroke.

The crankshaft positioning control method for a vehicle in the technology of the second patent application scope of the present invention, the integrated starter generator controller is used to control the engine start and stabilized power generation of an integrated starter generator, and the integrated starter generator The controller also includes a power transistor electrically connected to the integrated starter generator and the processing module, and the flameout control program in step (e) includes: (e-1) when the main switch is switched from the on state When changing to the off state to stop the engine, the integrated starter generator controller stops receiving the start command from the engine control unit; (e-2) the processing module determines whether the engine speed is less than a power generator Speed threshold; (e-3) if the result of the determination in step (e-2) is negative, the processing module performs constant voltage power generation control; and (e-4) if The determination result of step (e-2) is yes, then the processing module turns off the power transistor, and then determines whether the engine speed is less than the crankshaft positioning speed threshold.

The crankshaft positioning control method for a vehicle in the technology of the third patent application range of the present invention. The flameout crankshaft positioning program in step (f) includes: (f-1) the processing module determines whether the crankshaft angle is equal to a specific Angle; and (f-2) if the determination result of (f-1) is yes, the processing module causes the integrated starter generator to output a reverse torque, and then the engine speed is approximately zero and the When the crankshaft angle falls within an explosion stroke, the integrated starter generator is stopped.

The method for controlling the crankshaft positioning of a vehicle in the technology according to the fourth aspect of the present invention, the engine has a single cylinder or multiple cylinders.

The vehicle's crankshaft positioning control system in the technology of claim 5 of the present invention is applicable to the positioning control process of an engine's crankshaft, a battery, and an engine control unit, and includes a main switch electrically connected to the battery; And an integrated starter generator controller. The integrated starter generator controller is electrically connected to the main switch, the battery, and the engine control unit, and is used to execute a flameout control program using an auxiliary power source when the main switch is changed from an on state to an off state. The stall control routine determines whether an engine speed is less than a crankshaft positioning speed threshold. If the engine speed is less than the crankshaft positioning speed threshold, the integrated starter generator controller is also used to execute a stall cranking positioning procedure, so that a crankshaft angle falls within a non-compressed stroke, where the integrated start-up Generator controller package Including a main switch detection module, an electronic switch, a self-holding power module, and a processing module electrically connected to the main switch detection module, the electronic switch and the self-holding power module, when the main switch When the switch changes from the off state to the on state, the main switch detection module generates a main switch communication message and transmits it to the processing module. The processing module responds to the main switch communication message, causing the electronic switch to be turned on. , So that the power from the battery flows through the self-holding power module to establish the auxiliary power, and then the processing module receives a start command from the engine control unit.

The crankshaft positioning control system for a vehicle in the technology according to the sixth aspect of the present invention. The integrated starter generator controller is used to control the engine start and stabilized power generation of an integrated starter generator, and the integrated starter generator The controller also includes a power transistor electrically connected to the integrated starter generator and the processing module. When the main switch is changed from the on state to the off state to stop the engine, the integrated starter generator The controller stops receiving the start command from the engine control unit. In the flameout control program, the processing module determines whether the engine speed is less than a power generation speed threshold. If the engine speed is not less than the power generation speed threshold, then The processing module performs stable power generation control. If the engine speed is less than the power generation speed threshold, the processing module turns off the power transistor, and then determines whether the engine speed is less than the crankshaft positioning speed threshold.

The crankshaft positioning control system for a vehicle in the technology according to claim 7 of the present invention, in the flameout crankshaft positioning program, the processing module determines the crankshaft angle. Whether it is equal to a specific angle, if the crankshaft angle is equal to the specific angle, the processing module causes the integrated starter generator to output a reverse torque, and then the engine speed is about zero and the crankshaft angle falls in an explosion During the trip, the integrated starter generator was stopped.

The crankshaft positioning control system for a vehicle in the technology according to claim 8 of the present invention, the engine has a single cylinder or multiple cylinders.

The effect of the present invention by applying for the first item of the patent scope is that because the integrated starter generator controller has the relationship of the auxiliary power source, when the main switch is changed from the on state to the off state, the integrated type The starter generator controller will not be powered off immediately, so the integrated starter generator controller can use the auxiliary power source to perform the function of crankshaft positioning according to the engine speed and crankshaft angle at that time; when the main switch is from the off state When changing to the on state, the auxiliary power can be established through the coordinated operation of the main switch detection module, electronic switch, self-holding power module and processing module in the integrated starter generator controller, so that When the main switch is turned off, the integrated starter generator controller will not be powered off immediately.

The effect of the present invention by applying for the second item of the patent scope is that even if the main switch is turned off, the integrated starter generator controller can still use the auxiliary power source to continuously generate power during the engine stall and before the crankshaft positioning. Pressure control to recover the kinetic energy of the engine during the stall, so it has better energy recovery efficiency for the vehicle during taxiing, Helps use energy more efficiently.

The effect of the present invention by applying for the third item of the patent scope is that since the integrated starter generator outputs reverse torque when the crankshaft angle is equal to the specific angle, and then the engine speed is about zero and the crankshaft angle falls in the explosion stroke When the engine is started, the integrated starter generator stops operating, so it has good startability when the engine starts.

The effect of the present invention by applying for item 5 of the patent scope is that because the integrated starter generator controller has the relationship of the auxiliary power source, when the main switch changes from the on state to the off state, the integrated type The starter generator controller will not be powered off immediately, so the integrated starter generator controller can use the auxiliary power source to perform the function of crankshaft positioning according to the engine speed and crankshaft angle at that time; when the main switch is from the off state When changing to the on state, the auxiliary power can be established through the coordinated operation of the main switch detection module, electronic switch, self-holding power module and processing module in the integrated starter generator controller, so that When the main switch is turned off, the integrated starter generator controller will not be powered off immediately.

The effect of the present invention by applying for the sixth item in the scope of patent application is that even if the main switch is turned off, the integrated starter generator controller can still use the auxiliary power source to continuously generate power during the engine stall and before positioning the crankshaft Pressure control to recover the kinetic energy of the engine during the stall, so it has better energy recovery efficiency for the vehicle during taxiing and helps to use energy more efficiently.

The effect of the present invention by applying for the seventh item of the patent scope lies in: When the shaft angle is equal to the specific angle, the integrated starter generator outputs reverse torque, and then when the engine speed is about zero and the crankshaft angle falls within the explosion stroke, the integrated starter generator stops operating, so when the engine starts, it has Good startability.

20‧‧‧Main switch

21‧‧‧Integrated starter generator controller

211‧‧‧Main switch detection module

212‧‧‧electronic switch

213‧‧‧self-holding power module

214‧‧‧Processing Module

215‧‧‧Power Transistor

216‧‧‧Gate driver

22‧‧‧ Battery

23‧‧‧Engine Control Unit

24‧‧‧Integrated start generator

25‧‧‧Rotor position sensor

26‧‧‧Power Relay

27‧‧‧ communication interface

S31 ~ S35‧‧‧‧step

S40 ~ S46‧‧‧step

S431 ~ S435‧‧‧ steps

S4351 ~ S4354‧‧‧step

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a functional block diagram illustrating the control of reducing the engine starting torque disclosed in the existing patent publication No. I476320 of the Republic of China System; FIG. 2 is a functional block diagram illustrating an embodiment of a crankshaft positioning control system of a vehicle of the present invention; FIG. 3 is a flowchart illustrating a control program after a main switch is turned on in an embodiment of a crankshaft positioning control method of a vehicle of the present invention 4 is a flowchart illustrating the control program after the main switch is turned off in the embodiment; FIG. 5 is a flowchart illustrating the flameout control program in the control program after the main switch is turned off; and FIG. 6 is a flowchart The figure illustrates the flameout crank positioning routine in the flameout control routine.

Referring to FIG. 2, an embodiment of a crankshaft positioning control system of a vehicle of the present invention is applicable. In a positioning control process of a crankshaft (not shown) of an engine that may have a single-cylinder or multi-cylinder engine, a battery 22, and an engine control unit (ECU) 23.

In this embodiment, the vehicle's crankshaft positioning control system includes a main switch 20, an integrated starter generator (ISG) 24, a rotor position sensor 25, a power relay 26, and an integrated starter generator control器 21.

The battery 22 is used to provide power required by the integrated starter generator controller 21 and the engine control unit 23.

The engine control unit 23 is mainly used to control the injection of electrical components (such as fuel injectors, ignition coils, etc.) so that the engine can be started or stopped normally.

The main switch 20 is electrically connected to the battery 22, the integrated starter generator controller 21, and the power relay 26, and can be operated by the user between a key-off state and a key-on state Variety. For example, when the user wants the engine to shut down and turn off the power, he can inform the integrated starter generator controller 21 by operating the main switch 20 to the off state.

The integrated starter generator 24 is a brushless motor connected to the crankshaft of the engine, and can be used to provide forward or reverse torque of the crankshaft to achieve starting, power generation or crankshaft positioning functions.

The rotor position sensor 25 is used to provide a current angle of the rotor (not shown) of the integrated starter generator 24 so that the integrated starter controller 21 can correctly excite and read the ISG three-phase current. Current crankshaft angle and engine speed For reference when positioning the crankshaft.

The power relay 26 is not an absolutely necessary element in this embodiment, and is mainly for protection purposes. When the power relay 26 detects a system abnormality, it can cut off the power circuit between the integrated starter generator 24 and the battery 22 to avoid burning related electronic parts.

A communication interface 27 is connected between the integrated starter generator controller 21 and the engine control unit 23. When the engine control unit 23 detects that the user intends to start the vehicle, it will inform the integrated starter generator controller 21 to perform forward rotation start. When the integrated starter generator controller 21 determines that the engine speed reaches a threshold speed, it switches to a conduction mode of power generation, so that the current induced by the integrated starter generator 24 can be normally recharged to the battery 22. On the other hand, during the engine shutdown, the integrated starter generator controller 21 also stops the crankshaft in a non-compressed stroke, such as an explosion stroke, according to the appropriate crankshaft angle and engine speed.

In this embodiment, the integrated starter generator controller 21 includes a main switch detection module 211, an electronic switch 212, a self-holding power module 213, and a processing module 214 (e.g., a micro control unit, etc.) ), A power transistor 215, and a gate driver 216.

When the user operates the main switch 20 to change from the off state to the on state, the processing module 214 receives power and starts to operate. At this time, the processing module 214 learns that the main switch 20 is on through the main switch detection module 211, so The electronic switch 212 is turned on, so that the power from the battery 22 flows through the self-sustaining power module 213 to establish an auxiliary power source.

When the user operates the main switch 20 to change from the on state to the off state, the engine control unit 23 stops the operation of injecting electrical components and stops the engine. At this time, because the integrated starter generator controller 21 has the relationship of the auxiliary power source, power will not be cut off immediately. Therefore, with the auxiliary power source, the processing module 214 can know that the main switch 20 has been turned off by the main switch detection module 211, and will stop receiving the start command from the engine control unit 23, and According to the current engine speed and crankshaft angle, perform the function of crankshaft positioning.

2 to 6, an embodiment of a crankshaft positioning control method for a vehicle according to the present invention includes a control program after the main switch is turned on, and a control program after the main switch is turned off.

As shown in FIG. 3, in step S31 of the control program after the main switch is turned on, when the main switch 20 is changed from the off state to the on state, the main switch detection module 211 generates a main switch conduction message. Send to the processing module 214. Then, as shown in step S32, the processing module 214 responds to the main switch's communication message, so that the electronic switch 212 is turned on. Therefore, as shown in step S33, the power from the battery 22 flows through the self-sustaining power module 213 to establish the auxiliary power. Next, as shown in step S34, the power relay 26 is turned on. Then, as shown in step S35, when the engine control unit 23 issues a start command, the processing module 214 receives the start command from the engine control unit.

As shown in FIG. 4, in step S40 of the control program after the main switch is turned off, when the user operates the main switch 20 to change from the on state to the off state, the main switch detection module 211 generates a The main switch disconnection message is transmitted to the processing module 214. Next, as shown in step S41, since the main switch 20 has been turned off, the engine is turned off. Then, as shown in step S42, the integrated starter generator controller 21 stops receiving the start command from the engine control unit 23. Next, as shown in step S43, the integrated starter generator controller 21 uses the auxiliary power source to execute a flameout control program (see the description of FIG. 5 below).

As shown in step S431 of the flameout control program in the control program after the main switch is turned off, the integrated starter generator controller 21 controls the integrated starter generator 24 to perform regulated power generation, and as shown in step S432 The processing module 214 of the integrated starter generator controller 21 determines whether the engine speed is less than a power generation speed threshold. In this embodiment, the threshold value of the power generation speed may be, for example, 1000 RPM. If the determination result is no, steps S431 and S432 are performed again. Therefore, in the present invention, even when the main switch 20 is turned off, the integrated starter generator controller 21 can still use the backup power in the auxiliary power source to continuously generate power during the engine stall and before the crankshaft positioning. Voltage stabilization control to recover the kinetic energy of the engine during flameout, so it has better energy recovery efficiency for the vehicle during taxiing and helps to use energy more efficiently.

Conversely, if the determination result of step S432 is YES, it indicates the engine speed It is already lower than the threshold value of power generation speed, so then as shown in step S433, the power transistor 215 is turned off to end the stabilized power generation control. Next, as shown in step S434, the processing module 214 determines whether the engine speed is less than the crankshaft positioning speed threshold value, so as to ensure that the angle of the braking process does not exceed the expected position due to excessive engine inertia during braking. In this embodiment, the crankshaft positioning speed threshold may be, for example, 800 RPM. If the determination result of step S434 is NO, steps S433 and S434 are performed again. Conversely, if the determination result of step S434 is YES, the processing module 214 executes a flameout crank positioning routine (see the description of FIG. 6 below).

As shown in the quenching crank positioning routine of FIG. 6, first, as shown in step S4351, the processing module 214 determines whether the crank angle is equal to a specific angle. The specific angle threshold ensures that the crankshaft will stop behind that specific angle. In this embodiment, the crankshaft angle corresponding to the compression top dead center can be set to the specific angle, so that the crankshaft can be prevented from stopping at the compression stroke. If the determination result of step S4351 is NO, it indicates that the crankshaft angle has not reached the specific angle, so the processing module 214 executes step S4351 again.

Conversely, if the determination result in step S4351 is yes, then as shown in step S4352, the processing module 214 causes the integrated starter generator 24 to output a reverse torque Duty. The magnitude of the reverse torque Duty is related to the engine speed and crankshaft angle, that is, Duty = f (engine speed, crankshaft angle), where the higher the engine speed, the greater the reverse resistance, and if the crankshaft angle is away from the explosion stroke The closer the end, the lower the reversal resistance.

Next, as shown in step S4353, the processing module 214 determines whether the engine speed is approximately zero and whether the crankshaft angle falls within a non-compression stroke (such as an explosion stroke)? If the determination result is no, it indicates that the crankshaft positioning has not been completed, so steps S4352 and S4353 need to be performed again. Conversely, if the determination result is yes, which indicates that the crankshaft positioning has been completed, then as shown in step S4354, the processing module 214 causes the integrated starter generator 24 to stop operating to end the stalled crankshaft positioning in step S435 of FIG. The program and the flameout control program of step S43 in FIG. 4. Then, as shown in step S44 of FIG. 4, the power relay 26 is turned off. Then, as shown in step S45, the electronic switch 212 is turned off. Finally, as shown in step S46, the system is powered off to end the control program after the main switch is turned off.

In summary, the present invention has at least the following effects, so it can indeed achieve the purpose of the invention: The effect of the present invention by applying for the first item of the patent scope is that because the integrated starter controller has the relationship of the auxiliary power source Therefore, when the main switch is changed from the on state to the off state, the integrated starter generator controller will not be powered off immediately, so the integrated starter generator controller can use the auxiliary power source according to the then Engine rotation speed and crankshaft angle perform the function of crankshaft positioning; when the main switch is changed from the off state to the on state, the main switch detection module, electronic switch, The cooperative operation between the self-holding power supply module and the processing module can establish the auxiliary power supply, so that when the main switch is turned off, the integrated start-up generator controller will not immediately power off; The effect of the present invention by applying for the second item of the patent scope is that even if the main switch is turned off, the integrated starter generator controller can still use the auxiliary power source to continuously generate power during the engine stall and before the crankshaft positioning. Pressure control to recover the kinetic energy of the engine during flameout, so it has better energy recovery efficiency for the vehicle during taxiing and helps to use energy more efficiently. The effect of the third aspect of the present invention by applying for a patent lies in: When the crankshaft angle is equal to the specific angle, the integrated starter generator outputs reverse torque, and then when the engine speed is about zero and the crankshaft angle falls within the explosion stroke, the integrated starter generator stops operating, so when the engine starts It has good startability; the effect of the present invention by applying for the fifth item of the patent scope is that because the integrated starter controller has the relationship of the auxiliary power, the main switch is changed from the on state to the off state. In the state, the integrated starter generator controller does not immediately power off, so the integrated starter controller can use the The auxiliary power supply performs the function of crankshaft positioning according to the engine speed and crankshaft angle at that time; when the main switch is changed from the off state to the on state, the main switch in the integrated starter generator controller detects The cooperative operation among the module, the electronic switch, the self-holding power module and the processing module can establish the auxiliary power supply, so that when the main switch is turned off, the integrated starter generator controller will not immediately power off; the invention The effect of the sixth item in the scope of patent application is that even if the main switch is turned off, the integrated start-up generator controller can still use the auxiliary power source when the engine is turned off. During the fire and before the crankshaft positioning, the power generation and voltage stabilization control is continuously performed to recover the kinetic energy of the engine during the flameout, so that it has better energy recovery benefits for the vehicle during taxiing and helps to use energy more efficiently; and the present invention The effect of claim 7 of the scope of patent application is that since the integrated starter generator outputs reverse torque when the crankshaft angle is equal to the specific angle, and then when the engine speed is approximately zero and the crankshaft angle falls within the explosion stroke The integrated starter generator stops operating, so it has good startability when the engine starts.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application and the contents of the patent specification of the present invention are still Within the scope of the invention patent.

Claims (8)

A vehicle crankshaft positioning control method is suitable for a crankshaft positioning control process of an engine and includes the following steps: (a) providing an integrated starter generator controller, wherein the integrated starter generator controller includes a main A switch detection module, an electronic switch, a self-holding power module, and a processing module electrically connected to the main switch detection module, the electronic switch, and the self-holding power module; (b) when a main When the switch is changed from the off state to the on state, the main switch detection module generates a main switch communication message to the processing module; (c) in response to the main switch communication message, the processing module causes the electronic switch Turn on, so that the power from a battery flows through the self-holding power module to establish an auxiliary power; (d) the processing module receives a start command from an engine control unit; (e) when the main switch is from the on state When changing to the off state, the integrated starter generator controller uses the auxiliary power to execute a flameout control program, wherein the flameout control program determines Whether the engine speed is less than a crankshaft positioning speed threshold; and (f) if the engine speed is less than the crankshaft positioning speed threshold, the integrated starter generator controller executes a stall cranking positioning procedure, so that a crankshaft angle falls Within a non-compressed stroke. The crankshaft positioning control method for a vehicle according to claim 1, wherein the integrated starter generator controller is used to control the engine start and stabilized power generation of an integrated starter generator, and the integrated starter generator controller further It includes a power transistor electrically connected to the integrated starter generator and the processing module, and the flameout control procedure in step (e) includes the following steps: (e-1) when the main switch is changed from the on state When the engine is turned off to the off state, the integrated starter generator controller stops receiving the start command from the engine control unit; (e-2) the processing module determines whether the engine speed is less than a power generation speed Threshold value; (e-3) If the determination result of step (e-2) is negative, the processing module performs voltage stabilization control; and (e-4) If the determination result of step (e-2) If so, the processing module turns off the power transistor, and then determines whether the engine speed is less than the crankshaft positioning speed threshold. The crankshaft positioning control method for a vehicle according to claim 2, wherein the flameout crankshaft positioning program in the step (f) includes the following steps: (f-1) The processing module determines whether the crankshaft angle is equal to a specific angle ; And (f-2) if the determination result of (f-1) is yes, the processing module causes the integrated starter generator to output a reverse torque, and then the engine speed is approximately zero and the crankshaft When the angle falls within an explosion stroke, the integrated starter generator is stopped. The crankshaft positioning control method for a vehicle according to claim 1, wherein the engine has a single cylinder or a multi-cylinder. A vehicle crankshaft positioning control system is suitable for a crankshaft positioning control process of an engine, a battery, and an engine control unit, and includes: a main switch electrically connected to the battery; and an integrated starter generator controller, The main switch, the battery, and the engine control unit are electrically connected, and are used to execute a flameout control program using an auxiliary power source when the main switch is changed from an on state to an off state, wherein the flameout control program determines a Whether the engine speed is less than a crankshaft positioning speed threshold. If the engine speed is less than the crankshaft positioning speed threshold, the integrated starter generator controller is also used to execute a stall cranking positioning program, so that a crankshaft angle falls within a In the non-compressed stroke, the integrated starter generator controller includes a main switch detection module, an electronic switch, a self-holding power module, and an electrical connection to the main switch detection module and the electronic switch. And the processing module of the self-holding power module, when the main switch is disconnected from the When the state changes to the on state, the main switch detection module generates a main switch communication message and transmits it to the processing module. The processing module responds to the main switch communication message, causing the electronic switch to be turned on, so that the electronic switch comes from the battery. The auxiliary power is established by the power flowing through the self-holding power module, and then the processing module receives a start command from the engine control unit. The crankshaft positioning control system for a vehicle according to claim 5, wherein the integrated starter generator controller is used to control the engine start and stabilized power generation of an integrated starter generator, and the integrated starter generator controller also Including a power transistor electrically connected to the integrated starter generator and the processing module, when the main switch is changed from the on state to the off state to stop the engine, the integrated starter controller stops Receiving the start command from the engine control unit, in the flameout control program, the processing module determines whether the engine speed is less than a power generation speed threshold, and if the engine speed is not less than the power generation speed threshold, the processing module The group performs stable power generation control. If the engine speed is less than the power generation speed threshold, the processing module turns off the power transistor, and then determines whether the engine speed is less than the crankshaft positioning speed threshold. The crankshaft positioning control system for a vehicle according to claim 6, wherein in the flameout crankshaft positioning program, the processing module determines whether the crankshaft angle is equal to a specific angle, and if the crankshaft angle is equal to the specific angle, the process The module causes the integrated starter generator to output a reverse torque, and then causes the integrated starter generator to stop when the engine speed is approximately zero and the crankshaft angle falls within an explosion stroke. The crankshaft positioning control system for a vehicle according to claim 5, wherein the engine has a single cylinder or a multi-cylinder.