CN108322129B - Start-stop control method and system for BSG motor - Google Patents

Start-stop control method and system for BSG motor Download PDF

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Publication number
CN108322129B
CN108322129B CN201810225521.5A CN201810225521A CN108322129B CN 108322129 B CN108322129 B CN 108322129B CN 201810225521 A CN201810225521 A CN 201810225521A CN 108322129 B CN108322129 B CN 108322129B
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voltage
battery
bsg motor
control unit
vehicle control
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CN108322129A (en
Inventor
胡俊勇
葛娟娟
吕永楼
虞卫飞
杜成磊
朴红花
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
    • H02J7/0026—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/28—Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a method and a system for controlling starting and stopping of a BSG motor, wherein the method comprises the following steps: after the vehicle control unit receives a starting signal of a vehicle, acquiring the terminal voltage of a first battery and the terminal voltage of a BSG motor; if the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is larger than a first set value, the vehicle control unit controls the DCDC controller to invert and boost the voltage output by the second battery, so that the terminal voltage of the BSG motor is increased, and the terminal current is limited to be smaller than a starting current threshold; when the voltage difference value is smaller than a second set value, controlling a high-voltage contactor to be closed, and enabling the first battery to supply power to the BSG motor through the high-voltage contactor, wherein the second set value is smaller than the first set value; the vehicle control unit sends a motor starting signal to the BSG motor, and the BSG motor is started and drives a vehicle engine to rotate through a belt. The invention can improve the safety of the whole vehicle.

Description

Start-stop control method and system for BSG motor
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a start-stop control method and a start-stop control system for a BSG (brake-start generator) motor of a micro-hybrid electric vehicle.
Background
With the increasingly strict requirements of the country on the emission and oil consumption, in cities, due to the fact that population and vehicles are concentrated, the particularity of the operation conditions of urban vehicles is caused, particularly for urban buses and buses, stop stations are more, and in addition, red lights at traffic crossings stop, starting and stopping are very frequent, so that most of energy generated by an engine is consumed in the braking process in the form of heat generation by friction. And because of the long-time parking working condition, the engine is in an idle running state for a long time, so that the problems of low vehicle speed, high oil consumption, serious pollution and the like are caused. The hybrid power automobile adopts a hybrid power technology, and utilizes a motor to increase the rotating speed of an engine to be above an idle speed in a very short time through belt transmission, so that the automobile can be started and stopped quickly, and the energy consumption of the idling operation of the automobile is avoided. The hybrid electric vehicle not only converts heat energy into mechanical energy through an engine system to provide power, but also converts electric energy of a power storage battery into mechanical energy through the motor. The micro hybrid electric vehicle adopts 48V and 12V power supplies to supply power to the BSG motor, is the biggest difference with a low-voltage power supply which only has 12V and is only used for a traditional fuel oil vehicle, belongs to high-voltage electricity, and can form large current to impact a load at the moment of closing a high-voltage contactor, so that parts are damaged. Therefore, the start and stop control of the micro hybrid electric vehicle also considers the safe starting of the high-voltage system. Otherwise, not only the life safety of the driver and the maintainer is hidden, but also the electric appliances of the vehicle are damaged, and the safety and the functionality of the whole vehicle are affected.
Disclosure of Invention
The invention provides a method and a system for controlling starting and stopping of a BSG (brake System) motor, which solve the problem that when the BSG motor and a power storage battery are connected to start and stop at present, large current is formed at the closing moment due to voltage difference between two ends of a contactor to cause impact or spark to a load, and can improve the use safety and the electrical safety of a whole vehicle.
In order to achieve the above purpose, the invention provides the following technical scheme:
a starting and stopping control method of a BSG motor comprises the following steps:
after the vehicle control unit receives a starting signal of a vehicle, acquiring the terminal voltage of a first battery and the terminal voltage of a BSG motor;
if the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is larger than a first set value, the vehicle control unit controls the DCDC controller to invert and boost the voltage output by the second battery, so that the terminal voltage of the BSG motor is increased, and the terminal current is limited to be smaller than a starting current threshold;
when the voltage difference value is smaller than a second set value, controlling a high-voltage contactor to be closed, and enabling the first battery to supply power to the BSG motor through the high-voltage contactor, wherein the second set value is smaller than the first set value;
the vehicle control unit sends a motor starting signal to the BSG motor, and the BSG motor is started and drives a vehicle engine to rotate through a belt.
Preferably, the method further comprises the following steps:
if the high-voltage contactor is closed, the vehicle control unit controls the DCDC controller to transform the output voltage of the first battery into a first charging voltage according to a first transformation proportion, and the second battery is charged.
Preferably, the method further comprises the following steps:
after the high-voltage contactor is closed, detecting the output voltage of the second battery, and if the difference value of the output voltage of the second battery and a set voltage threshold is smaller than a set value, controlling the second battery to supply power to the coil end of the high-voltage contactor by the power supply voltage with a first duty ratio;
and if the output voltage of the second battery is gradually reduced and the difference value is larger than a set value, controlling the duty ratio of the power supply voltage of the second battery to the coil end to be gradually increased so as to keep the voltage supplied by the second battery to the coil end stable.
Preferably, the method further comprises the following steps:
and after the high-voltage contactor is closed, collecting the engine speed of a vehicle, and if the engine speed is greater than 0, controlling the DCDC controller to transform the voltage output by the BSG motor into a second charging voltage according to a second transformation proportion by the vehicle control unit so as to charge the second battery.
Preferably, the method further comprises the following steps:
if the rotating speed of the engine is 0, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end by the second battery to be 0, so that the high-voltage contactor is disconnected;
when the high-voltage contactor is disconnected, the vehicle control unit sends a discharging signal to the BSG motor, so that the BSG motor discharges the second battery or other loads through the DCDC controller;
and if the terminal voltage of the BSG motor is 0, the BSG motor is powered off, and the vehicle control unit sends a BSG motor stop message.
Preferably, the vehicle control unit receives a start signal of the vehicle, and includes:
when the vehicle is in a stop state, the vehicle control unit receives an ignition lock ON gear signal;
or when the vehicle speed is 0, the vehicle control unit receives a clutch pedal treading signal or a treading signal of a driving pedal.
The invention also provides a start-stop control system of the BSG motor, which comprises the following components: the system comprises a vehicle control unit, a DCDC controller, a first battery, a second battery and a high-voltage contactor;
the first battery is electrically connected with the BSG motor and the DCDC controller through the high-voltage contactor respectively, the second battery is electrically connected with the high-voltage contactor through the DCDC controller, and the vehicle control unit is in signal connection with the DCDC controller and the BSG motor;
the vehicle control unit acquires the terminal voltage of a first battery and the terminal voltage of a BSG motor after receiving a vehicle starting signal;
when the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is larger than a first set value, the whole vehicle controller controls the DCDC controller to invert and boost the voltage output by the second battery, so that the terminal voltage of the BSG motor is increased;
when the voltage difference value is smaller than a second set value, the vehicle control unit controls a high-voltage contactor to be closed, so that the first battery supplies power to the BSG motor through the high-voltage contactor, wherein the second set value is smaller than the first set value;
the vehicle control unit sends a motor starting signal to the BSG motor, and the BSG motor is started and drives a vehicle engine to rotate through a belt.
Preferably, the second battery is electrically connected with a coil end of the high-voltage contactor, and the second battery is in signal connection with the vehicle control unit;
the vehicle control unit is further used for detecting the output voltage of the second battery, and controlling the second battery to supply power to the coil end of the high-voltage contactor by the supply voltage with a first duty ratio when the difference value between the output voltage of the second battery and a set voltage threshold is smaller than a set value;
when the output voltage of the second battery is gradually reduced and the difference value is larger than a set value, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end from the second battery to be gradually increased, so that the voltage supplied to the coil end from the second battery is kept stable.
Preferably, the vehicle control unit acquires the engine speed of the vehicle through a CAN bus;
when the rotating speed of the engine is greater than 0, the vehicle control unit controls the DCDC controller to transform the voltage output by the BSG motor into a second charging voltage according to a second transformation proportion so as to charge the second battery;
when the rotating speed of the engine is 0, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end by the second battery to be 0, and the high-voltage contactor is disconnected;
when the high-voltage contactor is disconnected, the vehicle control unit sends a discharge signal to the BSG motor, and the BSG motor discharges the second battery or other loads through the DCDC controller;
and if the terminal voltage of the BSG motor is 0, the BSG motor is powered off, and the vehicle control unit sends a BSG motor stop message through the CAN bus.
Preferably, the first battery is a 48V power battery, and the second battery is a 12V storage battery.
The invention provides a method and a system for controlling starting and stopping of a BSG motor. Meanwhile, the first battery or the BSG motor charges the second battery through the DCDC controller voltage transformation. The problem of when the connection of current BSG motor and power battery is started and stopped, because of the voltage difference at contactor both ends, form heavy current in the closing moment and cause the impact or produce the spark to the load is solved, can improve the safety in utilization and the electric safety of whole car.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
FIG. 1: the invention provides a schematic diagram of a starting and stopping control method of a BSG motor;
FIG. 2: is a power-on control flow chart of the high-voltage contactor provided by the embodiment of the invention;
FIG. 3: is a power-off control flow chart of the high-voltage contactor provided by the implementation of the invention;
FIG. 4: the invention provides a structure diagram of a start-stop control system of a BSG motor.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
The invention provides a starting and stopping control method and a system of a BSG motor, aiming at the problem that the instantaneous voltage is overlarge or sparks are easy to occur when a high-voltage contactor is closed during starting and stopping of a conventional hybrid power vehicle, and solving the problem that the load is impacted or sparks are generated due to large current formed at the closing moment due to the voltage difference between two ends of the contactor when the conventional BSG motor and a power storage battery are connected during starting and stopping, so that the use safety and the electrical safety of the whole vehicle can be improved.
As shown in fig. 1, a schematic diagram of a start-stop control method for a BSG motor provided by the present invention includes the following steps:
s1: after the vehicle control unit receives a starting signal of a vehicle, acquiring the terminal voltage of a first battery and the terminal voltage of a BSG motor;
s2: if the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is larger than a first set value, the vehicle control unit controls the DCDC controller to invert and boost the voltage output by the second battery, so that the terminal voltage of the BSG motor is increased, and the terminal current is limited to be smaller than a starting current threshold;
s3: when the voltage difference value is smaller than a second set value, controlling a high-voltage contactor to be closed, and enabling the first battery to supply power to the BSG motor through the high-voltage contactor, wherein the second set value is smaller than the first set value;
s4: the vehicle control unit sends a motor starting signal to the BSG motor, and the BSG motor is started and drives a vehicle engine to rotate through a belt.
Specifically, the first battery is electrically connected with the BSG motor and the DCDC controller through the high-voltage contactor, the second battery is electrically connected with the high-voltage contactor through the DCDC controller, and the vehicle control unit is in signal connection with the DCDC controller and the BSG motor. As shown in fig. 2, when the voltage difference between the terminal voltage of the first battery and the terminal voltage of the BSG motor is greater than a first set value, that is, the voltage difference between the two ends of the high-voltage contactor is greater than the first set value, the vehicle control unit sends an inversion step-up signal to the DCDC controller, so that the second battery supplies power to the BSG motor after inversion step-up by the DCDC controller, so that the terminal voltage of the BSG motor is increased, and it is limited that the terminal current is less than the start current threshold, that is, the voltage at the other end of the high-voltage contactor is increased, until the voltage difference between the two ends of the high-voltage contactor is less than a second set value, the high-voltage contactor is closed, so that the first battery supplies power to the BSG. And when the BSG motor receives a motor starting signal sent by the vehicle control unit, the BSG motor is started. It should be noted that, in order to prevent the transient voltage generated when the high-voltage contactor is closed from impacting the load, the voltage ratio between the two ends of the high-voltage contactor is usually greater than 95%. And the second battery is inverted and boosted through the DCDC controller, so that the end current of the BSG motor is less than 1A. This end current is not sufficient to start the BSG motor.
In another embodiment, the method further comprises:
s5: if the high-voltage contactor is closed, the vehicle control unit controls the DCDC controller to transform the output voltage of the first battery into a first charging voltage according to a first transformation proportion, and the second battery is charged.
Specifically, the DCDC controller also has a voltage transformation function, and when the high-voltage contactor is closed, the DCDC controller controls the voltage transformation of the output voltage of the first battery, so that the output voltage meets the charging voltage requirement of the second battery, and the power consumption of the second battery can be reduced.
In yet another embodiment, the method further comprises:
s6: after the high-voltage contactor is closed, detecting the output voltage of the second battery, and if the difference value of the output voltage of the second battery and a set voltage threshold is smaller than a set value, controlling the second battery to supply power to the coil end of the high-voltage contactor by the power supply voltage with a first duty ratio;
s7: and if the output voltage of the second battery is gradually reduced and the difference value is larger than a set value, controlling the duty ratio of the power supply voltage of the second battery to the coil end to be gradually increased so as to keep the voltage supplied by the second battery to the coil end stable.
Specifically, during the operation of the vehicle, the high-voltage contactor can be disconnected due to insufficient power supply, the system cannot be automatically powered up, and the system must be powered up again through the ignition lock switch. Therefore, in order to stabilize the pull-in of the high-voltage contactor, the second battery is adopted to independently supply power to the coil end of the high-voltage contactor, and when the voltage output of the second battery is unstable, the duty ratio of the voltage signal is increased, so that the voltage of the coil end is always kept stable.
In other embodiments, the method further comprises:
s8: and after the high-voltage contactor is closed, collecting the engine speed of a vehicle, and if the engine speed is greater than 0, controlling the DCDC controller to transform the voltage output by the BSG motor into a second charging voltage according to a second transformation proportion by the vehicle control unit so as to charge the second battery.
Specifically, after the high-voltage contactor is closed and the engine runs, the vehicle control unit sends a voltage reduction instruction to the DCDC controller, so that the DCDC controller reduces the voltage output by the BSG motor and charges the second battery. It should be noted that the voltage output by the BSG motor also charges the first battery.
In addition, the method may further include:
s9: if the rotating speed of the engine is 0, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end by the second battery to be 0, so that the high-voltage contactor is disconnected;
s10: when the high-voltage contactor is disconnected, the vehicle control unit sends a discharging signal to the BSG motor, so that the BSG motor discharges the second battery or other loads through the DCDC controller;
s11: and if the terminal voltage of the BSG motor is 0, the BSG motor is powered off, and the vehicle control unit sends a BSG motor stop message.
Specifically, as shown in fig. 3, after the engine is shut down, the vehicle control unit receives a stop signal, collects the engine speed, and when the engine speed is 0, the vehicle control unit controls the second battery to disconnect the power supply at the coil end of the high-voltage contactor, so that the high-voltage contactor is disconnected. Meanwhile, the vehicle control unit also sends a discharge signal to the BSG motor, so that the voltage in the capacitive load is completely released, and the electrical safety of the system is ensured.
Further, the vehicle control unit receives a starting signal of the vehicle, and comprises:
when the vehicle is in a stop state, the vehicle control unit receives an ignition lock ON gear signal; or when the vehicle speed is 0, the vehicle control unit receives a clutch pedal treading signal or a treading signal of a driving pedal.
Therefore, the invention provides a start-stop control method of a BSG motor, which increases the terminal voltage of the BSG motor after inverting and boosting the voltage output by a second battery through a DCDC controller. Meanwhile, the first battery or the BSG motor charges the second battery through the DCDC controller voltage transformation. The problem of when the connection of current BSG motor and power battery is started and stopped, because of the voltage difference at contactor both ends, form heavy current in the closing moment and cause the impact or produce the spark to the load is solved, can improve the safety in utilization and the electric safety of whole car.
As shown in fig. 4, a structure diagram of a start-stop control system of a BSG motor is provided for the present invention, and the system includes: the vehicle-mounted controller comprises a vehicle control unit, a DCDC controller, a first battery, a second battery and a high-voltage contactor K. The first battery is electrically connected with the BSG motor and the DCDC controller through the high-voltage contactor K, the second battery is electrically connected with the high-voltage contactor K through the DCDC controller, and the vehicle control unit is in signal connection with the DCDC controller and the BSG motor.
The vehicle control unit acquires the terminal voltage of a first battery and the terminal voltage of a BSG motor after receiving a vehicle starting signal; when the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is larger than a first set value, the whole vehicle controller controls the DCDC controller to invert and boost the voltage output by the second battery, so that the terminal voltage of the BSG motor is increased, and the terminal current is limited to be smaller than a starting current threshold; when the voltage difference value is smaller than a second set value, the vehicle control unit controls a high-voltage contactor to be closed, so that the first battery supplies power to the BSG motor through the high-voltage contactor, wherein the second set value is smaller than the first set value; the vehicle control unit sends a motor starting signal to the BSG motor, and the BSG motor is started and drives a vehicle engine to rotate through a belt.
Further, the second battery is electrically connected with a coil end of the high-voltage contactor K, and the second battery is in signal connection with the vehicle control unit. The vehicle control unit is further configured to detect an output voltage of the second battery, and control the second battery to supply power to the coil end of the high-voltage contactor K with a supply voltage of a first duty ratio when a difference value between the output voltage of the second battery and a set voltage threshold is smaller than a set value. When the output voltage of the second battery is gradually reduced and the difference value is larger than a set value, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end from the second battery to be gradually increased, so that the voltage supplied to the coil end from the second battery is kept stable.
Furthermore, the vehicle control unit acquires the engine speed of the vehicle through a CAN bus. When the rotating speed of the engine is greater than 0, the vehicle control unit controls the DCDC controller to transform the voltage output by the BSG motor into a second charging voltage according to a second transformation proportion so as to charge the second battery. When the rotating speed of the engine is 0, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end by the second battery to be 0, and the high-voltage contactor K is disconnected. When the high-voltage contactor K is disconnected, the vehicle control unit sends a discharge signal to the BSG motor, and the BSG motor discharges the second battery or other loads through the DCDC controller. And if the terminal voltage of the BSG motor is 0, the BSG motor is powered off, and the vehicle control unit sends a BSG motor stop message through the CAN bus.
In practical application, the first battery is a 48V power battery, and the second battery is a 12V storage battery.
Therefore, the invention provides a start-stop control system of a BSG motor, which increases the terminal voltage of the BSG motor after inverting and boosting the voltage output by a second battery through a DCDC controller. Meanwhile, the first battery or the BSG motor charges the second battery through the DCDC controller voltage transformation. The problem of when the connection of current BSG motor and power battery is started and stopped, because of the voltage difference at contactor both ends, form heavy current in the closing moment and cause the impact or produce the spark to the load is solved, can improve the safety in utilization and the electric safety of whole car.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.

Claims (7)

1. A starting and stopping control method of a BSG motor is characterized by comprising the following steps:
the method comprises the steps that a first battery is electrically connected with a BSG motor and a DCDC controller through a high-voltage contactor respectively, and a second battery is electrically connected with the high-voltage contactor through the DCDC controller;
after the vehicle control unit receives a starting signal of a vehicle, acquiring the terminal voltage of a first battery and the terminal voltage of a BSG motor;
if the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is larger than a first set value, the vehicle control unit controls the DCDC controller to invert and boost the voltage output by the second battery, so that the terminal voltage of the BSG motor is increased, and the terminal current is limited to be smaller than a starting current threshold value, so that the pre-charging voltage before the high-voltage contactor is closed is realized;
when the voltage difference value is smaller than a second set value, controlling a high-voltage contactor to be closed, and enabling the first battery to supply power to the BSG motor through the high-voltage contactor, wherein the second set value is smaller than the first set value;
the vehicle control unit sends a motor starting signal to the BSG motor, and the BSG motor is started and drives a vehicle engine to rotate through a belt;
if the high-voltage contactor is closed, the vehicle control unit controls the DCDC controller to transform the output voltage of the first battery into a first charging voltage according to a first transformation proportion, and the second battery is charged;
after the high-voltage contactor is closed, detecting the output voltage of the second battery, and if the difference value of the output voltage of the second battery and a set voltage threshold is smaller than a set value, controlling the second battery to supply power to the coil end of the high-voltage contactor by the power supply voltage with a first duty ratio;
and if the output voltage of the second battery is gradually reduced and the difference value is larger than a set value, controlling the duty ratio of the power supply voltage of the second battery to the coil end to be gradually increased so as to keep the voltage supplied by the second battery to the coil end stable.
2. The start-stop control method according to claim 1, characterized by further comprising:
and after the high-voltage contactor is closed, collecting the engine speed of a vehicle, and if the engine speed is greater than 0, controlling the DCDC controller to transform the voltage output by the BSG motor into a second charging voltage according to a second transformation proportion by the vehicle control unit so as to charge the second battery.
3. The start-stop control method according to claim 2, characterized by further comprising:
if the rotating speed of the engine is 0, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end by the second battery to be 0, so that the high-voltage contactor is disconnected;
when the high-voltage contactor is disconnected, the vehicle control unit sends a discharging signal to the BSG motor, so that the BSG motor discharges the second battery or other loads through the DCDC controller;
and if the terminal voltage of the BSG motor is 0, the BSG motor is powered off, and the vehicle control unit sends a BSG motor stop message.
4. The start-stop control method according to claim 3, wherein the step of receiving a starting signal of the vehicle by the vehicle control unit comprises the following steps:
when the vehicle is in a stop state, the vehicle control unit receives an ignition lock ON gear signal;
or when the vehicle speed is 0, the vehicle control unit receives a clutch pedal treading signal or a treading signal of a driving pedal.
5. The utility model provides a start-stop control system of BSG motor which characterized in that includes: the system comprises a vehicle control unit, a DCDC controller, a first battery, a second battery and a high-voltage contactor;
the first battery is electrically connected with the BSG motor and the DCDC controller through the high-voltage contactor respectively, the second battery is electrically connected with the high-voltage contactor through the DCDC controller, and the vehicle control unit is in signal connection with the DCDC controller and the BSG motor;
the vehicle control unit acquires the terminal voltage of a first battery and the terminal voltage of a BSG motor after receiving a vehicle starting signal;
when the voltage difference value between the terminal voltage of the first battery and the terminal voltage of the BSG motor is larger than a first set value, the vehicle control unit controls the DCDC controller to invert and boost the voltage output by the second battery, so that the terminal voltage of the BSG motor is increased, and the terminal current is limited to be smaller than a starting current threshold value, so that the pre-charging voltage before the high-voltage contactor is closed is realized;
when the voltage difference value is smaller than a second set value, the vehicle control unit controls a high-voltage contactor to be closed, so that the first battery supplies power to the BSG motor through the high-voltage contactor, wherein the second set value is smaller than the first set value;
the vehicle control unit sends a motor starting signal to the BSG motor, and the BSG motor is started and drives a vehicle engine to rotate through a belt;
the second battery is electrically connected with the coil end of the high-voltage contactor, and the second battery is in signal connection with the vehicle control unit;
the vehicle control unit is further used for detecting the output voltage of the second battery, and controlling the second battery to supply power to the coil end of the high-voltage contactor by the supply voltage with a first duty ratio when the difference value between the output voltage of the second battery and a set voltage threshold is smaller than a set value;
when the output voltage of the second battery is gradually reduced and the difference value is larger than a set value, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end from the second battery to be gradually increased, so that the voltage supplied to the coil end from the second battery is kept stable.
6. The start-stop control system according to claim 5, wherein the vehicle control unit acquires the engine speed of the vehicle through a CAN bus;
when the rotating speed of the engine is greater than 0, the vehicle control unit controls the DCDC controller to transform the voltage output by the BSG motor into a second charging voltage according to a second transformation proportion so as to charge the second battery;
when the rotating speed of the engine is 0, the vehicle control unit controls the duty ratio of the power supply voltage of the coil end by the second battery to be 0, and the high-voltage contactor is disconnected;
when the high-voltage contactor is disconnected, the vehicle control unit sends a discharge signal to the BSG motor, and the BSG motor discharges the second battery or other loads through the DCDC controller;
and if the terminal voltage of the BSG motor is 0, the BSG motor is powered off, and the vehicle control unit sends a BSG motor stop message through the CAN bus.
7. The start-stop control system according to claim 6, characterized in that the first battery is a 48V power battery and the second battery is a 12V storage battery.
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