CN112622867A - Quick start system and method for hybrid electric vehicle - Google Patents

Quick start system and method for hybrid electric vehicle Download PDF

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Publication number
CN112622867A
CN112622867A CN202011565609.5A CN202011565609A CN112622867A CN 112622867 A CN112622867 A CN 112622867A CN 202011565609 A CN202011565609 A CN 202011565609A CN 112622867 A CN112622867 A CN 112622867A
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China
Prior art keywords
engine
automobile
48vbsg
motor
controller
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CN202011565609.5A
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Chinese (zh)
Inventor
吴�荣
高丽娟
周谦临
汪鹏
刘尧
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Chery Automobile Co Ltd
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Chery Automobile Co Ltd
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Priority to CN202011565609.5A priority Critical patent/CN112622867A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
    • B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The utility model provides a quick start-up system for car belongs to car technical field. The quick starting system comprises a controller, a 48VBSG motor and a 48V battery, wherein the controller is multiplexed as a controller of the engine control unit, and the controller is used for sending a starting instruction to the 48VBSG motor and the 48V battery according to an obtained starting request; the 48V battery is used for supplying power to the 48VBSG motor according to the received starting instruction; the 48VBSG motor is used for dragging the engine to rotate according to the received starting instruction; the controller is also used for controlling the engine to carry out oil injection and ignition when the rotating speed of the engine reaches a first set value. The quick starting system reduces the information quantity of CAN communication interaction and the bus load rate, thereby eliminating signal delay and error frame generation brought by CAN communication.

Description

Quick start system and method for hybrid electric vehicle
Technical Field
The present disclosure relates to the field of automotive technologies, and in particular, to a quick start system and method for an automobile.
Background
The quick starting system can increase the standard voltage of the vehicle equipment to 48V, so that the quick starting system can drive a vehicle-mounted system with higher power, and can be better integrated with other systems on the vehicle.
In the related art, a controller of the quick start system is usually connected to a control unit of the engine through a CAN bus, and performs information interaction through the CAN bus.
However, the information interaction using the CAN bus increases the bus load rate, which results in signal delay or error frame generation, and even affects the connection stability between the controller and the external device.
Disclosure of Invention
The embodiment of the disclosure provides a quick start system and a quick start method for an automobile, which reduce the information quantity of CAN communication interaction and reduce the bus load rate, thereby eliminating signal delay and error frame generation brought by CAN communication. The technical scheme is as follows:
in a first aspect, a quick start system for a hybrid vehicle is provided, which is characterized by comprising a controller, a 48VBSG motor and a 48V battery,
the controller is multiplexed as a controller of the engine control unit and used for sending a starting instruction to the 48VBSG motor and the 48V battery according to the obtained starting request;
the 48V battery is used for supplying power to the 48VBSG motor according to the received starting instruction;
the 48VBSG motor is used for dragging the engine to rotate according to the received starting instruction;
the controller is also used for controlling the engine to carry out oil injection and ignition when the rotating speed of the engine reaches a first set value.
Optionally, the controller determines that the start request is acquired when at least one of the following conditions is satisfied:
when the automobile is in a power-off state or the automobile is in a power-on but non-starting state, detecting that a brake pedal is stepped on and a starting button is pressed;
when the auxiliary parking function of the automobile is turned off and the automobile is parked, detecting that a brake pedal is released;
when the auxiliary parking function of the automobile is started and the automobile is parked, it is detected that an accelerator pedal is stepped down to a set opening range or a rotating angle of a steering wheel is larger than a set angle.
Optionally, the controller is configured to send a start instruction to the 48VBSG motor and the 48V battery according to the acquired start request when the following conditions are all satisfied:
the temperature of the engine reaches a starting temperature threshold, the charge of the 48V battery reaches a starting charge threshold, and the output power of the 48V battery reaches a starting power threshold.
Optionally, the controller is further configured to send a stop command to the 48VBSG motor when the rotation speed of the engine reaches a second set value, where the second set value is greater than the first set value;
and the 48VBSG motor is used for stopping dragging the engine according to the received stop command.
Optionally, the vehicle further comprises an air conditioning module, and the controller is further configured to:
and receiving a control signal sent by the air conditioning module, and controlling the starting and stopping of the engine according to the control signal sent by the air conditioning module, wherein the control signal is sent by the air conditioning module according to the relation between the temperature in the automobile and the temperature set by a user in the state that the automobile is stopped.
In a second aspect, there is provided a quick start method for a hybrid vehicle including the quick start system according to the first aspect, the quick start method comprising:
detecting a start request;
sending a starting instruction to the 48VBSG motor and the 48V battery according to the detected starting request, wherein the starting instruction is used for instructing the 48VBSG motor to supply power to the 48VBSG motor, so that the 48VBSG motor drives the engine to rotate;
and when the rotating speed of the engine reaches a first set value, controlling the engine to perform oil injection and ignition.
Optionally, the detecting the initiation request includes:
detecting the initiation request when at least one of the following conditions is met:
when the automobile is in a power-off state or the automobile is in a power-on but non-starting state, detecting that a brake pedal is stepped on and a starting button is pressed;
when the auxiliary parking function of the automobile is turned off and the automobile is parked, detecting that a brake pedal is released;
when the auxiliary parking function of the automobile is started and the automobile is parked, it is detected that an accelerator pedal is stepped down to a set opening range or a rotating angle of a steering wheel is larger than a set angle.
Optionally, the sending a start instruction to the 48VBSG motor and the 48V battery according to the detected start request includes:
when the following conditions are all satisfied, sending a starting instruction:
the temperature of the engine reaches a starting temperature threshold, the charge of the 48V battery reaches a starting charge threshold, and the output power of the 48V battery reaches a starting power threshold.
Optionally, the fast boot method further includes:
and when the rotating speed of the engine reaches a second set value, sending a stop instruction to the 48VBSG motor, wherein the second set value is larger than the first set value, and the stop instruction is used for indicating the 48VBSG motor to stop dragging the engine.
Optionally, the fast boot method further includes:
and receiving a control signal sent by the air conditioning module, and controlling the starting and stopping of the engine according to the control signal sent by the air conditioning module, wherein the control signal is sent by the air conditioning module according to the relation between the temperature in the automobile and the temperature set by a user in the state that the automobile is stopped.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
the quick starting of the automobile is realized by arranging the quick starting system on the automobile. Wherein, in the controller of quick start system's controller multiplexing for engine control unit, the information interaction of the controller in the quick start system and the controller of engine CAN directly become the inside shared signal of controller by CAN communication interaction to CAN reduce the interactive information quantity of CAN communication, reduce CAN bus load rate, and then CAN eliminate signal delay and the wrong frame that the CAN communication brought, and guarantee controller and external equipment's stability of being connected. Meanwhile, the arrangement space of the controller can be saved, and resources are saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a quick start system for an automobile according to an embodiment of the present disclosure;
FIG. 2 is a logic diagram of an engine start condition determination provided by an embodiment of the present disclosure;
FIG. 3 is a graph illustrating the engine speed during a quick start of an automobile according to an embodiment of the present disclosure;
fig. 4 is a flowchart of a method for quickly starting a hybrid electric vehicle according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The disclosed embodiments provide a quick start system for a vehicle for controlling engine starting of the vehicle. Fig. 1 is a schematic structural diagram of a quick start system for an automobile according to an embodiment of the present disclosure, and as shown in fig. 1, the quick start system includes a controller 10, a 48VBSG motor 20, and a 48V battery 30.
The controller 10 is multiplexed as a controller of the engine control unit K, and the controller 10 is configured to send a start instruction to the 48VBSG motor 20 and the 48V battery 30 according to the acquired start request; the 48V battery 30 is used for supplying power to the 48VBSG motor 20 according to the received starting instruction; the 48VBSG motor 20 is used for dragging the engine M to rotate according to the received starting instruction; the controller 10 is also used for controlling the engine to perform fuel injection and ignition when the rotating speed of the engine reaches a first set value.
The embodiment of the disclosure realizes the quick start of the automobile by arranging the quick start system on the automobile. Wherein, in the controller of quick start system's controller multiplexing for engine control unit, the information interaction of the controller in the quick start system and the controller of engine CAN directly become the inside shared signal of controller by CAN communication interaction to CAN reduce the interactive information quantity of CAN communication, reduce CAN bus load rate, and then CAN eliminate signal delay and the wrong frame that the CAN communication brought, and guarantee controller and external equipment's stability of being connected. Meanwhile, the arrangement space of the controller can be saved, and resources are saved.
Optionally, the vehicle further comprises a rotational speed sensor for detecting a rotational speed of the engine. The controller 10 is connected to a rotational speed sensor to acquire the rotational speed of the engine.
Illustratively, the first set point is 600 rpm. The 48VBSG motor 20 drags the engine to rotate in an idling mode after receiving a starting instruction. The rotating speed of the engine is gradually increased from 0, and the rotating speed is increased upwards. When the controller 10 acquires that the rotating speed of the engine reaches 600rpm through the rotating speed sensor, the engine is controlled to perform oil injection and ignition.
Optionally, the quick start system further comprises a DCDC voltage conversion module 40. The DCDC voltage conversion module 40 is configured to convert the 48V electric energy output by the 48V battery 30 into 12V electric energy to supply power to the 12V electrical loads of the entire vehicle.
Optionally, the vehicle further comprises a 12V battery Q. The 12V power converted by the DCDC voltage conversion module 40 may be supplied to the 12V battery Q. The 12V battery Q can supply power for 12V electric loads of the whole vehicle.
Optionally, the 48VBSG motor 20, the 48V battery 30, and the DCDC voltage conversion module 40 are all connected to the controller 10 via a CAN bus 50.
In the embodiment of the present disclosure, the controller 10 is a Hybrid Control Unit (HCU), and the controller K of the Engine M is an Electronic Control Unit (ECU).
Alternatively, the rotating shaft of the 48VBSG motor 20 is power-connected to a pulley at the crankshaft end of the engine via a belt via a pulley.
The belt and pulley transmission is adopted instead of gear transmission, so that the power transmission is ensured, and meanwhile, a certain degree of slipping is allowed, so that the impact caused by the 48VBSG motor in the mode switching process is reduced, and the impact damage of a mechanical structure is prevented.
Optionally, a tensioning wheel is arranged outside the belt, so that the wrapping angle of the belt pulley can be increased while the belt is tightly pressed, and the belt can transmit larger power.
In a first implementation of the disclosed embodiment, the controller 10 is configured to:
when the automobile is in a power-off state or the automobile is in a power-on but non-starting state, the fact that the brake pedal is pressed down and the starting button is pressed is detected, and it is determined that the starting request is acquired.
When the automobile is in a power-off state, the speed of the automobile is 0, the rotating speed of the engine is 0, and at this time, the automobile is shut down. When the vehicle is powered on but not started, the controller 10 continuously receives a key signal sent by the driver through the vehicle key within a set time, the vehicle is powered on but not started, the speed of the vehicle is still 0, and the rotating speed of the engine is still 0. For example, the controller 10 continuously receives a key signal transmitted by a user through a car key within 3-5S.
Illustratively, the vehicle includes a brake switch. In the disclosed embodiment, the controller 10 is connected to a brake switch in the vehicle, so that whether the driver depresses the pedal can be determined according to the brake switch. The controller 10 may also acquire the state of the start button to determine whether the start button is pressed by the driver. When the driver presses the brake pedal and presses the start button, the driver wants to start the automobile.
In a second implementation of the embodiment of the present disclosure, the controller 10 is configured to: when the auxiliary parking function of the automobile is turned off and the automobile is parked, the brake pedal is detected to be released, and the starting request is determined to be acquired.
The car further comprises an auxiliary parking module, and when the auxiliary parking module is turned on, the user can be assisted to park the car. The controller 10 may be connected to the assistant parking module for acquiring whether the assistant parking function of the vehicle is turned on or off. When the automobile is parked, that is, when the rotation speed of the automobile is 0, if the controller 10 detects that the driver releases the brake pedal through the brake stroke sensor, it indicates that the driver wants to start the automobile, and at this time, the controller 10 regards that the start request is obtained.
In a third implementation of the embodiment of the present disclosure, the controller 10 is configured to: when the auxiliary parking function of the automobile is started and the automobile is parked, the fact that the accelerator pedal is stepped down to the set opening range or the rotating angle of the steering wheel is larger than the set angle is detected, and the fact that the starting request is obtained is determined.
For example, the controller 10 may detect the opening degree of the accelerator pedal depressed by the driver through an accelerator stroke sensor. For example, the set opening range is set to 1% to 100%. If the accelerator travel sensor detects that the opening of the accelerator pedal reaches a set opening range, the automobile is started.
Optionally, the automobile further has a steering wheel rotation angle detector for detecting a rotation angle of the steering wheel. The controller 10 is connected to a steering wheel rotation angle detector so that the rotation angle of the steering wheel can be acquired.
Illustratively, when the driver turns the steering wheel clockwise or counterclockwise by a turning angle of 30 ° or more, it is said that the vehicle is intended to be started.
It should be noted that the first implementation manner provided by the embodiment of the present disclosure is a case where the automobile is to enter a quick start state from an off state or a power-on state. In the second to third implementations, when the vehicle encounters a traffic light, for example, the vehicle is temporarily stopped and then enters a fast start state again, i.e., the fast start of the start-stop mode.
Optionally, the vehicle exits the start-stop mode when the driver performs at least one of a gear shift, unbelt, opening the main driver door, or opening the front hatch.
The vehicle further illustratively includes a shift module, a seat belt detection sensor, a main driver door detection sensor, and a hatch door detection sensor.
Wherein the driver can perform a gear shift operation by means of the gear shift module. The seat belt detection sensor may be used to detect whether the driver is wearing a seat belt. The main door detection sensor may be used to detect whether a main door of the automobile is open. The hatch door detection sensor may be used to detect whether a hatch door of the automobile is open.
The controller 10 is connected to the shift module, the seatbelt detection sensor, the main driver door detection sensor, and the hatch door detection sensor, respectively. So that it can be judged whether the driver performs a gear shift, a seatbelt release, a main driver door opening, or a front hatch opening operation.
Further, the 48V battery 30 needs to have the ability to restart the vehicle. And the main conditions affecting the starting capability of the 48V battery 30 include the vehicle temperature, and the charge and output power of the 48V battery 30.
Therefore, the controller 10 is configured to send a start instruction to the 48VBSG motor 20 and the 48V battery 30 according to the acquired start request when the following conditions are all satisfied:
the temperature of the engine M reaches the starting temperature threshold, the charge of the 48V battery 30 reaches the starting charge threshold, and the output power of the 48V battery 30 reaches the starting power threshold.
Illustratively, the temperature threshold T is activated0Is at a temperature of-20 ℃,threshold Q of starting electric quantity0The rated capacity of the 48V battery is 37%.
It should be noted that, since the 48V battery 30 is more susceptible to temperature than the 12V battery Q, in order to ensure that the 48V battery 30 can achieve the same dragging effect as the 12V battery Q when dragging the engine to rotate, the start power threshold W of the 48V battery 30 is defined in the embodiment of the present disclosure0At 8kw, i.e., when the output power of the 48V battery 30 reaches 8kw or more, the 48V motor 20 is allowed to start.
Illustratively, the automobile further includes a temperature detection unit for detecting an engine temperature. The controller 10 is connected to the temperature detection unit to acquire the temperature of the engine detected by the temperature detection unit.
Optionally, the vehicle further comprises a power detection unit for detecting the power of the 48V battery 30, and the controller is connected to the power detection unit to obtain the power of the 48V battery 30 detected by the power detection unit.
Optionally, the automobile further includes a power detection unit for detecting the output power of the 48V battery 30, and the controller 10 is connected with the power detection unit to obtain the output power of the 48V battery 30 detected by the power detection unit.
Optionally, the controller 10 is further configured to send a stop command to the 48VBSG motor 20 when the engine speed reaches a second set point, the second set point being greater than the first set point. The 48VBSG motor 20 is configured to stop dragging the engine in response to the received stop command.
For example, the second set point may be set by the driver as desired, for example, the second set point is 800 rpm.
When the rotation speed of the engine continuously increases to above 800rpm, that is, reaches the second set value, the controller 10 may send a stop instruction to the 48VBSG motor 20, so that the 48VBSG motor 20 stops dragging the engine M to rotate. At the moment, the engine is switched to a standby state, and the fuel injection and ignition operation is stopped. Therefore, under the starting mode of the 48VBSG motor 20, the whole vehicle can be started quickly and stably without obvious noise and vibration and severe emission.
Optionally, the vehicle further includes a rotating shaft speed detecting sensor for detecting the rotating shaft of the 48VBSG motor 20, and the controller 10 is connected to the rotating shaft speed detecting sensor for acquiring the rotating speed of the rotating shaft of the 48VBSG motor 20. And the controller 10 can also identify the slip degree of the belt and perform slip protection according to the rotation speed of the rotating shaft of the 48VBSG motor 20 and the rotation speed of the 48VBSG motor 20, so that the service life of the belt can be prolonged.
Optionally, the vehicle further has an air conditioning module thereon, and the controller 10 is further configured to: and receiving a control signal sent by the air conditioning module, and controlling the starting and stopping of the engine according to the control signal sent by the air conditioning module, wherein the control signal is sent by the air conditioning module according to the relation between the temperature in the automobile and the temperature set by a user in the state that the automobile is stopped.
For example, when the temperature in the automobile is higher than the temperature set by a user, the air conditioning module sends a first control signal to control the engine to start, so that the refrigeration module is driven to refrigerate. And when the temperature in the automobile is lower than the set temperature of the user, the air conditioning module sends a second control signal to control the engine to stop.
In the embodiment of the disclosure, when the air conditioner is used in an automobile, the load is large, and at the moment, the control signal of the air conditioner is directly adopted to control whether the engine is started or stopped. I.e., whether the engine is shut down, and for how long, the decision is given to the air conditioning module.
In another implementation manner of the embodiment of the present disclosure, when the vehicle load is small, after the engine is stopped, in order to avoid the situation that the engine cannot start due to a long-time non-start, a maximum allowable stop time limit is usually set, and the engine is automatically started after time out. For example, a maximum allowable downtime of 3min may be set.
Fig. 2 is a logic diagram of engine start condition judgment according to an embodiment of the present disclosure, and as shown in fig. 2, when the vehicle is in a power-off state, the vehicle speed is zero, and the engine speed is zero. The driver acquires a start request. Or when the automobile is in a power-on and non-starting state, the controller acquires a starting request. The automobile is in a power-on state or a power-off state, and the voltage state of the 48V battery can be obtained to determine, when the automobile is in the power-on state, the 48V battery is in a power supply state, and when the automobile is in the power-off state, the 48V battery is disconnected from power supply.
Further, the controller 10 needs to determine whether the engine temperature reaches the starting temperature threshold T0Whether or not the charge of the 48V battery 30 reaches the starting charge threshold Q0And whether or not the output power of the 48V battery 30 reaches the starting power threshold W0And whether the engine speed exceeds a speed threshold r0。
If the controller obtains the request command, and the controller 10 determines that the engine temperature reaches the starting temperature threshold T048V battery 30 reaches a starting charge threshold Q0The output power of the 48V battery 30 reaches the starting power threshold W0And the rotational speed of the engine exceeds a rotational speed threshold r0And the controller sends a starting instruction to control the engine to start.
After receiving a starting instruction, the 48VBSG motor 20 enters a power mode from a no-load mode, converts electric energy in the 48V battery 30 into mechanical energy, and transmits the mechanical energy to an engine crankshaft through a belt wheel to drag the engine to rotate. Because the output power of the 48VBSG motor 20 is much larger than that of the 12V motor, when the 48VBSG motor 20 is used for starting, the engine can be directly dragged to be above the idle speed, and the speed is increased by electric energy. The working condition that the engine is started to be rushed after being dragged by the 12V motor is replaced, and therefore better emission performance is achieved. When the engine is successfully started, the 48V system is taken out of the starting mode, and the automobile enters an idling state.
Fig. 3 is a rotation speed curve diagram of an engine during a quick start of an automobile according to an embodiment of the disclosure, and as shown in fig. 3, after the quick start system according to the embodiment of the disclosure is adopted, a controller may control the rotation speed of the engine to achieve a rotation speed overshoot within a time period of 3494-3495 s, so that the rotation speed of the engine may reach about 900rpm from below 25rpm in a short time. The engine is started in the idling mode, so that the engine runs in the neutral state, the starting time is shorter, the emission of the engine during starting can be effectively improved, and the engine is more energy-saving and environment-friendly.
Fig. 4 is a flowchart of a method for quickly starting a hybrid vehicle according to an embodiment of the present disclosure, and as shown in fig. 4, the quick starting method is applied to the quick starting system according to the embodiment, and the quick starting method is executed by a controller of the quick starting system. The quick starting method comprises the following steps:
step 401, a start request is detected.
Illustratively, step 401 may include:
the initiation request is detected when at least one of the following conditions is met:
first, when the vehicle is in a power-down state or the vehicle is in a power-up but non-start state, it is detected that the brake pedal is depressed and the start button is pressed.
When the automobile is in a power-off state, the speed of the automobile is 0, the rotating speed of the engine is 0, and at this time, the automobile is shut down. When the vehicle is powered on but not started, the controller 10 continuously receives the key signal sent by the driver through the vehicle key within the set time, the vehicle speed of the vehicle is still 0, and the rotation speed of the engine is still 0.
For example, the controller 10 continuously receives a key signal transmitted by a user through a car key within 3-5S.
Secondly, when the auxiliary parking function of the automobile is turned off and the automobile is parked, the brake pedal is detected to be released.
And thirdly, when the auxiliary parking function of the automobile is started and the automobile is parked, detecting that the accelerator pedal is stepped down to the set opening range or the rotating angle of the steering wheel is larger than the set angle.
Alternatively, the set opening range is 1% to 100%, and if the brake stroke sensor detects that the opening of the brake pedal reaches the set opening range, it indicates that the vehicle is to be started.
Alternatively, when the driver rotates the steering wheel clockwise or counterclockwise by a rotation angle of 30 ° or more, it is said that the vehicle is intended to be started.
It should be noted that the first case provided by the embodiment of the present disclosure is a case where the automobile is to enter a quick start state from an off state or a power-on state. In the second to third cases, the vehicle is temporarily stopped and then enters a fast start state again when encountering a traffic light, for example, i.e., a fast start in a start-stop mode.
When the driver performs at least one of the operations of shifting, unbelting, opening the main driving door or opening the front hatch, the automobile exits the start-stop mode.
Step 402, sending a starting instruction to the 48VBSG motor and the 48V battery according to the detected starting request, wherein the starting instruction is used for indicating the 48VBSG motor to supply power to the 48VBSG motor, so that the 48VBSG motor drives the engine to rotate.
In the Stat-Stop mode, the 48V battery 30 needs to be able to restart the vehicle. And the main conditions affecting the starting capability of the 48V battery 30 include the vehicle temperature, and the charge and output power of the 48V battery 30. Thus, step 402 may comprise:
when the following conditions are all satisfied, sending a starting instruction:
the temperature of the engine reaches a start temperature threshold, the charge of the 48V battery reaches a start charge threshold, and the output power of the 48V battery reaches a start power threshold.
Illustratively, the temperature threshold T is activated0At-20 deg.C, starting up an electric quantity threshold Q0The rated capacity of the 48V battery is 37%.
It should be noted that, since the 48V battery 30 is more susceptible to temperature than the 12V battery Q, in order to ensure that the 48V battery 30 can achieve the same dragging effect as the 12V battery Q when dragging the engine to rotate, the start power threshold W of the 48V battery 30 is defined in the embodiment of the present disclosure0At 8kw, i.e., when the output power of the 48V battery 30 reaches 8kw or more, the 48V motor 20 is allowed to start.
And step 403, controlling the engine to perform oil injection and ignition when the rotating speed of the engine reaches a first set value.
Illustratively, the first set point is 600 rpm. The 48VBSG motor 20 drags the engine to rotate in an idling mode after receiving a starting instruction. The rotating speed of the engine is gradually increased from 0, and the rotating speed is increased upwards. When the controller 10 acquires that the rotation speed of the engine reaches 600rpm through the rotation speed sensor, the engine is controlled to perform fuel injection ignition (such as turning a key or pressing a start button).
Optionally, the fast boot method further includes:
and when the rotating speed of the engine reaches a second set value, sending a stop instruction to the 48VBSG motor, wherein the second set value is larger than the first set value, and the stop instruction is used for indicating the 48VBSG motor to stop dragging the engine.
For example, the second set point may be set by the driver as desired, for example, the second set point is 800 rpm.
When the rotation speed of the engine continuously increases to above 800rpm, that is, reaches the second set value, the controller 10 may send a stop instruction to the 48VBSG motor 20, so that the 48VBSG motor 20 stops dragging the engine M to rotate. At the moment, the engine is switched to a standby state, and the fuel injection and ignition operation is stopped. Therefore, under the starting mode of the 48VBSG motor 20, the whole vehicle can be started quickly and stably without obvious noise and vibration and severe emission.
Optionally, the fast boot method further includes:
and receiving a control signal sent by the air conditioning module, and controlling the starting and stopping of the engine according to the control signal sent by the air conditioning module, wherein the control signal is sent by the air conditioning module according to the relation between the temperature in the automobile and the temperature set by a user in the state that the automobile is stopped.
In the embodiment of the disclosure, when the automobile uses the air conditioner, the load is large, and at the moment, the control signal of the air conditioner module is directly adopted to control whether the engine is started or stopped. I.e., whether the engine is shut down, and for how long, the decision is given to the air conditioning module.
In another implementation manner of the embodiment of the present disclosure, when the vehicle load is small, after the engine is stopped, in order to avoid the situation that the engine cannot start due to a long-time non-start, a maximum allowable stop time limit is usually set, and the engine is automatically started after time out. For example, a maximum allowable downtime of 3min may be set.
The embodiment of the disclosure realizes the quick start of the automobile by adopting the quick start system. Wherein, in the controller of quick start system's controller multiplexing for engine control unit, the information interaction of the controller in the quick start system and the controller of engine CAN directly become the inside shared signal of controller by CAN communication interaction to CAN reduce the interactive information quantity of CAN communication, reduce CAN bus load rate, and then CAN eliminate signal delay and the wrong frame that the CAN communication brought, and guarantee controller and external equipment's stability of being connected. Meanwhile, the arrangement space of the controller can be saved, and resources are saved.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (10)

1. A quick start system for a hybrid vehicle, characterized in that the quick start system comprises a controller (10), a 48VBSG motor (20), and a 48V battery (30),
the controller (10) is multiplexed as a controller of an engine control unit (K), and the controller (10) is used for sending a starting instruction to the 48VBSG motor (20) and the 48V battery (30) according to the obtained starting request;
the 48V battery (30) is used for supplying power to the 48VBSG motor (20) according to the received starting instruction;
the 48VBSG motor (20) is used for dragging the engine to rotate according to the received starting instruction;
the controller (10) is also used for controlling the engine to carry out fuel injection and ignition when the rotating speed of the engine reaches a first set value.
2. The quick start system according to claim 1, wherein the controller (10) determines that the start request is acquired when at least one of the following conditions is satisfied:
when the automobile is in a power-off state or the automobile is in a power-on but non-starting state, detecting that a brake pedal is stepped on and a starting button is pressed;
when the auxiliary parking function of the automobile is turned off and the automobile is parked, detecting that a brake pedal is released;
when the auxiliary parking function of the automobile is started and the automobile is parked, it is detected that an accelerator pedal is stepped down to a set opening range or a rotating angle of a steering wheel is larger than a set angle.
3. The quick start system according to claim 1, wherein the controller (10) is configured to send a start instruction to the 48VBSG motor (20) and the 48V battery (30) according to the acquired start request when the following conditions are all satisfied:
the temperature of the engine reaches a start temperature threshold, the charge of the 48V battery (30) reaches a start charge threshold, and the output power of the 48V battery (30) reaches a start power threshold.
4. A quick start system according to any of claims 1 to 3, characterized in that the controller (10) is further adapted to send a stop command to the 48VBSG motor (20) when the rotational speed of the engine reaches a second set value, the second set value being greater than the first set value;
the 48VBSG motor (20) is used for stopping dragging the engine according to the received stop command.
5. A quick start system according to any of claims 1 to 3, wherein said vehicle further has an air conditioning module thereon, said controller (10) being further adapted to:
and receiving a control signal sent by the air conditioning module, and controlling the starting and stopping of the engine according to the control signal sent by the air conditioning module, wherein the control signal is sent by the air conditioning module according to the relation between the temperature in the automobile and the temperature set by a user in the state that the automobile is stopped.
6. A quick start method for a hybrid vehicle, the hybrid vehicle including the quick start system of claim 1, the quick start method comprising:
detecting a start request;
sending a starting instruction to the 48VBSG motor (20) and the 48V battery (30) according to the detected starting request, wherein the starting instruction is used for instructing the 48VBSG motor (20) to supply power to the 48VBSG motor (20) and enabling the 48VBSG motor (20) to drag the engine to rotate;
and when the rotating speed of the engine reaches a first set value, controlling the engine to perform oil injection and ignition.
7. The fast boot method of claim 6, wherein the detecting a boot request comprises:
detecting the initiation request when at least one of the following conditions is met:
when the automobile is in a power-off state or the automobile is in a power-on but non-starting state, detecting that a brake pedal is stepped on and a starting button is pressed;
when the auxiliary parking function of the automobile is turned off and the automobile is parked, detecting that a brake pedal is released;
when the auxiliary parking function of the automobile is started and the automobile is parked, it is detected that an accelerator pedal is stepped down to a set opening range or a rotating angle of a steering wheel is larger than a set angle.
8. The rapid start method according to claim 6, wherein the sending a start instruction to the 48VBSG motor (20) and the 48V battery (30) according to the detected start request comprises:
when the following conditions are all satisfied, sending a starting instruction:
the temperature of the engine reaches a start temperature threshold, the charge of the 48V battery (30) reaches a start charge threshold, and the output power of the 48V battery (30) reaches a start power threshold.
9. The rapid start-up method according to any one of claims 6 to 8, characterized in that the rapid start-up method further comprises:
and when the rotating speed of the engine reaches a second set value, sending a stop instruction to the 48VBSG motor (20), wherein the second set value is larger than the first set value, and the stop instruction is used for indicating the 48VBSG motor (20) to stop dragging the engine.
10. The quick start method according to any one of claims 6 to 8, wherein the vehicle further has an air conditioning module thereon, the quick start method further comprising:
and receiving a control signal sent by the air conditioning module, and controlling the starting and stopping of the engine according to the control signal sent by the air conditioning module, wherein the control signal is sent by the air conditioning module according to the relation between the temperature in the automobile and the temperature set by a user in the state that the automobile is stopped.
CN202011565609.5A 2020-12-25 2020-12-25 Quick start system and method for hybrid electric vehicle Pending CN112622867A (en)

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