CN114056322B - Method for controlling starting of vehicle, storage medium and vehicle - Google Patents
Method for controlling starting of vehicle, storage medium and vehicle Download PDFInfo
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- CN114056322B CN114056322B CN202010752438.0A CN202010752438A CN114056322B CN 114056322 B CN114056322 B CN 114056322B CN 202010752438 A CN202010752438 A CN 202010752438A CN 114056322 B CN114056322 B CN 114056322B
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims abstract description 21
- 239000000446 fuel Substances 0.000 claims description 16
- 238000004590 computer program Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 32
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 239000003921 oil Substances 0.000 description 8
- 238000011217 control strategy Methods 0.000 description 7
- 239000010705 motor oil Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
-
- 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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
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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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0644—Engine speed
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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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0666—Engine torque
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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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
- B60W2710/083—Torque
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- 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)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention provides a method for controlling starting of a vehicle, a storage medium and the vehicle, comprising the following steps: the method comprises the steps of obtaining starting friction torque and BSG dragging torque required by starting according to the magnitude of friction force required to be overcome by starting, wherein the actual dragging torque of a BSG motor is larger than the starting friction torque, and controlling the crankshaft of an engine to rotate; when the rotation speed of the engine reaches the preset oil injection rotation speed, controlling the oil injection combustion of the engine; controlling the engine to continuously increase the rotating speed, adjusting the actual dragging torque of the BSG motor to gradually reduce to a zero torque value according to the rotating speed of the engine so that the total torque required for starting is larger than the target idle speed friction torque, and adjusting the total torque required for starting according to the rotating speed of the engine so that the rotating speed of the engine is maintained at the target idle speed; the starting result is determined based on the engine speed and the actual motoring torque of the BSG motor. The method for controlling the starting of the vehicle can improve NVH performance problems caused when the starting rotating speed exceeds the target idle rotating speed.
Description
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method for controlling starting of a vehicle, a storage medium, and a vehicle.
Background
Domestic hybrid vehicle launch control methods are typically provided by controller suppliers, with some of the entire plants using their own launch control strategies. Currently, a traditional fuel vehicle strategy is used for a domestic hybrid vehicle with a BSG (Belt-Driven Starter Generator, BSG) motor. For example, as shown in fig. 1, a schematic diagram of a state of a hybrid vehicle start control strategy in the related art is shown.
However, a common vehicle starting control method is adopted, the starting control strategy is simple and rough, the starting effect is quite different, the problems of overshoot and jitter of the rotating speed may exist in the starting process, the starting NVH (Noise, vibration, harshness, noise, vibration and harshness) is poor, the starting process parameters lack of physical significance, and the starting process is controlled by two different controllers of an ECM (Engine Control Model, an engine control module) and a VCU (Vehicle Control Unit, a whole vehicle control module), so that the parameters are not beneficial to being coordinated and matched quickly. And, the control method sets the engine oil injection speed and the BSG unloading torsion speed to the same speed, which is unfavorable for optimizing NVH in the starting process.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to propose a method for controlling the starting of a vehicle, the control parameters of which have a physical meaning and which can improve the poor NVH performance.
A second object of the invention is to propose a non-transitory computer storage medium.
A third object of the present invention is to propose a vehicle.
To achieve the above object, an embodiment of a first aspect of the present invention proposes a method of controlling a vehicle start, the method comprising: the starting friction torque and the BSG dragging torque required by starting are obtained according to the magnitude of the friction force required by starting, the starting of the BSG motor is controlled, the actual dragging torque of the BSG motor is larger than the starting friction torque, and the crankshaft of the engine is controlled to rotate; when the rotation speed of the engine reaches the preset oil injection rotation speed, controlling the oil injection combustion of the engine; controlling an engine to continuously increase the rotating speed, adjusting the actual dragging torque of the BSG motor to gradually reduce to a zero torque value according to the rotating speed of the engine so that the total starting demand torque is larger than the target idle speed friction torque, and adjusting the total starting demand torque according to the rotating speed of the engine so that the rotating speed of the engine is maintained at the target idle speed; adjusting the starting demand total torque according to the engine speed so that the engine speed is maintained at a target idle speed; and determining a starting result according to the engine speed and the actual dragging torque of the BSG motor.
According to the method for controlling the starting of the vehicle, in the starting process of the vehicle, required total torque is adopted for starting control, in the starting process, when the engine speed is overlarge and exceeds the torque unloading speed, friction torque corresponding to the required total torque relative to the target idle speed is controlled, engine rotation speed adjustment is achieved, the engine speed is kept at the target idle speed, obvious and overlarge speed upshoot in the starting process is avoided, engine speed adjustment is achieved by introducing the required total torque, NVH performance problems caused after the starting speed exceeds the target idle speed are improved, fuel consumption is reduced, the engine speed is kept near the target idle speed, vehicle starting control is achieved, and when the engine is in oil injection combustion, the actual dragging torque of the BSG motor is adjusted according to the engine speed and the dragging target speed of the BSG motor, matching calibration of the control parameters in the starting process is facilitated, matching calibration workload is reduced, and matching calibration effect is improved.
In some embodiments, adjusting the actual motoring torque of the BSG motor to a zero torque value according to the engine speed includes: the engine speed reaches a first BSG torque-removing speed, the actual dragging torque of the BSG motor is controlled to start to be reduced until the engine speed reaches a BSG dragging target speed, and the actual dragging torque of the BSG motor is reduced to the reverse dragging torque corresponding to the dragging target speed; the engine speed is increased from the BSG dragging target speed to the second BSG torque unloading speed, and the actual dragging torque of the BSG motor is controlled to maintain the reverse dragging torque corresponding to the dragging target speed; and the engine speed is increased from the second BSG torque unloading speed to the BSG torque unloading completion speed, and the actual dragging torque of the BSG motor is controlled to be reduced to a zero torque value from the reverse dragging torque corresponding to the dragging target speed. By introducing the starting process pre-control parameters with control physical significance, the starting process is thinned and clarified, the matching calibration of the control parameters of the starting process is facilitated, the matching calibration workload is reduced, and the matching calibration effect is improved.
In some embodiments, adjusting the starting demand total torque in accordance with the engine speed such that the engine speed is maintained at a target idle speed comprises: the speed difference between the engine speed and the target idle speed is smaller than a third threshold value and larger than a fourth threshold value, and the starting demand total torque is controlled to start to be reduced, wherein the fourth threshold value is smaller than the third threshold value; and controlling the total torque required for starting to be reduced to friction torque corresponding to the target idle speed when the speed difference between the engine speed and the target idle speed is smaller than the fourth threshold value. By introducing the starting process pre-control parameters with control physical significance, the starting process is thinned and clarified, the matching calibration of the control parameters of the starting process is facilitated, the matching calibration workload is reduced, and the matching calibration effect is improved.
In some embodiments, determining a starting result from the engine speed and an actual dragging torque of the BSG motor includes: and determining that the engine is successfully started when the engine speed reaches a set target engine speed and the actual dragging torque of the BSG motor is smaller than a BSG torque threshold responding to the torque demand.
In some embodiments, the preset fuel injection speed is less than a target drag torque of the BSG motor. By the arrangement, the actual dragging torque of the BSG motor can be adjusted, and support is provided for controlling the starting of the vehicle.
In some embodiments, the BSG motor and the engine are controlled by the same controller. The vehicle starting process is controlled by the same controller, so that NVH (noise, vibration and harshness) problems caused by control parameter conflict, mismatching and starting process shake and the like due to the fact that a plurality of controllers do not have coordinated control can be avoided.
To achieve the above object, an embodiment of a second aspect of the present invention proposes a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements a method of controlling a vehicle launch according to any one of claims 1-6.
In order to achieve the above object, a third aspect of the present invention provides a vehicle including: an engine and a BSG motor; a controller for controlling the engine and the BSG motor according to the method of controlling vehicle start described in the above embodiment.
According to the vehicle provided by the embodiment of the invention, the controller controls the engine and the BSG motor to execute the method for controlling the starting of the vehicle, and the friction torque corresponding to the total required torque relative to the target idle speed is controlled to realize the regulation of the engine rotating speed, so that the engine rotating speed is maintained at the target idle speed, obvious and excessive speed up-rushing in the starting process is avoided, the NVH expression problem caused by the fact that the starting rotating speed exceeds the target idle speed is improved, and the fuel consumption is reduced.
In some embodiments, the controller is one of a whole vehicle controller and an engine controller, and the control is performed by the same controller, so that the NVH problems of control parameter conflict, mismatching and starting process shake caused by no coordination control of a plurality of controllers can be avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic illustration of a hybrid vehicle launch control strategy of the related art;
FIG. 2 is a flow chart of a method of controlling vehicle launch according to one embodiment of the present invention;
FIG. 3 is a schematic illustration of a vehicle start control strategy under ideal conditions according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a vehicle start control strategy in an actual state according to one embodiment of the present invention;
fig. 5 is a block diagram of a vehicle according to one embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
In the embodiment, when the vehicle starts, starting control is performed by using total torque required for starting, torque requirements of the BSG motor and the engine are uniformly coordinated and controlled by a controller, in the starting process of the vehicle, the total torque required for starting is larger than target idle friction torque, when the rotating speed of the engine reaches the target idle rotating speed, the total torque required is equal to friction torque corresponding to the target idle rotating speed, when the rotating speed of the engine approaches the target idle rotating speed, the rotating speed closed-loop control is performed, and starting is completed.
A method of controlling the start of a vehicle according to an embodiment of the first aspect of the present invention is described below with reference to fig. 2 to 4.
As shown in fig. 2, the method for controlling the vehicle start according to the embodiment of the present invention may be divided into a rotation process for overcoming friction, a torque control process for stabilizing the rotation speed of the BSG motor, a total torque acceleration process after fuel injection combustion, and a successful start process, and includes at least steps S1 to S4, and the method for controlling the vehicle start is illustrated with reference to steps S1 to S4.
In an embodiment, an ideal vehicle start control schematic diagram is shown in fig. 3, and in an actual control process, engine torque is difficult to control at the time of starting, so that the vehicle start control schematic diagram in fig. 3 is adaptively modified, so that the modified schematic diagram is closer to the actual vehicle start control schematic diagram. Where P1 represents the actual motor torque of the BSG and P2 represents the total engine torque demand. The modified schematic is shown in fig. 4.
And S1, obtaining starting friction torque and BSG dragging torque required by starting according to the magnitude of friction force required to be overcome by starting, controlling the starting of a BSG motor, wherein the actual dragging torque of the BSG motor is larger than the starting friction torque, and controlling the crank rotation of the engine.
In an embodiment, when the vehicle starts, the controller detects a vehicle start signal, obtains the magnitude of a vehicle start friction torque according to the magnitude of a friction force required to be overcome when the vehicle starts in the current environment, calculates a BSG dragging torque of a BSG motor required during starting, and controls an engine crankshaft to start rotating and the engine to start generating a rotating speed when the actual dragging torque of the BSG motor is larger than the friction torque.
And S2, controlling the fuel injection combustion of the engine when the engine speed reaches the preset fuel injection speed.
In the embodiment, when the engine speed reaches a preset oil injection speed, for example, the engine speed reaches 400rpm, the engine starts oil injection combustion and generates torque, the actual dragging torque of the BSG motor is adjusted by comparing the engine speed with the dragging target speed of the BSG motor, namely, when the actual dragging torque of the BSG motor is adjusted, the starting process pre-control parameter with physical significance is introduced, and the dragging target speed of the BSG motor is introduced in the embodiment, so that the vehicle starting process is refined and clarified, the matching calibration of the control parameter in the starting process is facilitated, the matching calibration workload is reduced, and the matching calibration effect is improved. By adjusting the actual dragging torque of the BSG motor, when no fuel injection combustion is ensured, the rotating speed of the BSG motor is near the dragging target rotating speed, and excessive overshoot cannot occur, so that the fact that the engine rotating speed continues to rise is not caused by dragging of the BSG motor, but is driven in a combustion cylinder of the transmitter can be determined.
And S3, controlling the engine to continuously increase the rotating speed, adjusting the actual dragging torque of the BSG motor to gradually reduce to a zero torque value according to the rotating speed of the engine so that the total torque required for starting is larger than the target idle speed friction torque, controlling the engine to continuously increase the rotating speed, and adjusting the total torque required for starting according to the rotating speed of the engine so that the rotating speed of the engine is maintained at the target idle speed.
In an embodiment, as shown in fig. 4, a schematic diagram of a starting control strategy of a vehicle in an actual state according to an embodiment of the present invention is shown. Where E1 represents the total engine torque demand, E2 represents the engine target torque, and E3 represents the actual torque of the BSG motor. Before the engine oil injection combustion after-demand total torque acceleration process is entered, torque generated by engine oil injection combustion, namely in-cylinder effective combustion is formed in the engine cylinder, but due to the existence of BSG dragging torque, whether the engine speed is increased due to BSG dragging or engine self combustion driving cannot be determined, in order to determine the condition that the engine is not normally combustion driven, the process that the engine speed exceeds the dragging target speed of a BSG motor and reaches the target idle speed is defined as the oil injection combustion after-coordination total torque acceleration process, wherein the required total torque is BSG dragging torque and driving torque generated by engine combustion, namely combustion torque, and when the engine speed exceeds a specific speed, such as the BSG torque removing speed, the actual torque of the BSG motor starts to be controlled to gradually decay from the target dragging torque to a zero torque value, namely when the engine speed is too fast, the actual torque of the BSG motor is reduced, so that the starting demand total torque is larger than the target idle speed friction torque. And when the engine speed continues to be lifted, the required total torque is adjusted, and the engine speed is adjusted by controlling the friction torque corresponding to the required total torque and the target idle speed, so that the engine speed is maintained at the target idle speed, and the speed overshoot is avoided. The engine oil injection speed and the BSG motor torque unloading speed are calibrated separately, so that NVH optimization in the starting process is facilitated.
And S4, determining a starting result according to the engine speed and the actual dragging torque of the BSG motor.
In an embodiment, the vehicle start result is related to an engine speed and an actual dragging torque of the BSG motor, and when the engine speed and the actual dragging torque of the BSG motor satisfy a condition of vehicle start, it is determined that the vehicle start is successful, and when the vehicle start is successful, the vehicle may enter normal idle speed control or torque control in response to a torque demand of the whole vehicle; when the engine speed and the actual drag torque of the BSG motor do not meet the vehicle starting conditions, the vehicle is not started well or fails to start.
According to the method for controlling the starting of the vehicle, in the starting process of the vehicle, starting control is carried out by adopting the required total torque, in the starting process, when the engine speed is overlarge and exceeds the torque unloading speed, the friction torque corresponding to the required total torque relative to the target idle speed is controlled, the engine speed is regulated, the engine speed is maintained at the target idle speed, obvious and overlarge speed upshoots in the starting process are avoided, the engine speed regulation is realized by introducing the required total torque, the NVH performance problem caused after the starting speed exceeds the target idle speed is improved, the fuel consumption is reduced, the engine speed is maintained near the target idle speed, the starting control of the vehicle is realized, and in addition, the actual dragging torque of the BSG motor is regulated according to the engine speed and the dragging target speed of the BSG motor when the engine is in oil injection combustion, the matching calibration of the control parameter in the starting process is facilitated, the matching calibration workload is reduced, and the matching effect is improved.
In some embodiments, when the actual dragging torque of the BSG motor is gradually reduced to a zero torque value according to the engine speed, and when the engine starts fuel injection combustion and generates torque, the starting required total torque is BSG dragging torque and engine torque, the speed difference between the engine speed and the dragging target speed of the BSG motor is smaller than a first threshold and larger than a second threshold, that is, when the engine speed approaches the dragging target speed of the BSG motor, the actual torque of the BSG motor is controlled to start to reduce, and the second threshold is smaller than the first threshold, for example, when the engine speed reaches the first BSG torque-removing speed, the actual torque of the BSG motor is controlled to start to reduce until the engine speed reaches the BSG dragging target speed, and the actual dragging torque of the BSG motor is reduced to the reverse dragging torque corresponding to the dragging target speed, as shown in fig. 4.
When the speed difference between the engine speed and the dragging target speed of the BSG motor is smaller than the second threshold, the engine speed is considered to be equal to the dragging target speed of the BSG motor, the dragging torque of the BSG motor is controlled to maintain the reverse dragging torque corresponding to the dragging target speed, wherein the reverse dragging torque corresponding to the dragging target speed is a non-zero torque, for example, as shown in fig. 4, the engine speed is raised from the BSG dragging target speed to the second BSG torque-removing speed, and the actual dragging torque of the BSG motor is controlled to maintain the reverse dragging torque corresponding to the dragging target speed. And the engine speed is increased from the second BSG torque unloading speed to the BSG torque unloading completion speed, and the actual dragging torque of the BSG motor is controlled to be reduced to a zero torque value from the reverse dragging torque corresponding to the dragging target speed. When the engine is ensured to burn without oil injection, the rotating speed of the BSG motor is near the dragging target rotating speed, and excessive overshoot is not generated, so that the continuous rising of the rotating speed of the engine can be determined, the driving in the combustion cylinder of the transmitter is not caused by the dragging of the BSG motor, the starting process is thinned and clarified by introducing the starting process pre-control parameters with control physical significance, the matching calibration of the control parameters of the starting process is facilitated, the matching calibration workload is reduced, and the matching calibration effect is improved.
In some embodiments, the controller adjusts the starting demand total torque according to the engine speed, so that when the engine speed is maintained at the target idle speed, the demand total torque is ensured to be larger than the corresponding friction torque at the target idle speed, and in fact, the dragging torque of the BSG motor at the speed comprises friction and pumping loss, the engine accelerates, and when the speed difference between the engine speed and the target idle speed is smaller than a third threshold value and larger than a fourth threshold value, namely, the engine speed is close to the target idle speed and does not reach the speed, the starting demand total torque is controlled to start to be reduced, wherein the fourth threshold value is smaller than the third threshold value; when the speed difference between the engine speed and the target idle speed is smaller than a fourth threshold, namely when the engine speed reaches the target idle speed, the total torque required for starting is controlled to be reduced to the friction torque corresponding to the target idle speed, so that the engine speed is maintained at the target idle speed. By introducing the starting process pre-control parameters with control physical significance, the starting process is thinned and clarified, the matching calibration of the control parameters of the starting process is facilitated, the matching calibration workload is reduced, and the matching calibration effect is improved.
In some embodiments, when the start result is determined based on the engine speed and the actual pull-up torque of the BSG motor, for example, as shown in fig. 4, when the engine speed reaches the set engine target speed, i.e., at point a in fig. 4, and the actual pull-up torque of the BSG motor is less than the BSG torque threshold responsive to the torque demand, the engine start is determined to be successful, and upon determining that the engine start is successful, the vehicle may enter normal idle control or torque control responsive to the torque demand for the whole vehicle.
In other embodiments, the engine fuel injection speed and the dragging target speed of the BSG motor may be set to be greater than or equal to the target idle speed, where when the engine speed reaches the engine fuel injection speed or the dragging target speed of the BSG motor, the BSG torque is directly removed until the engine speed approaches the target idle speed, and the vehicle is controlled to enter the speed closed-loop control, but when the speed closed-loop control is entered, the vehicle start cannot be considered successful, the BSG dragging torque needs to be gradually reduced until the BSG dragging torque is less than the BSG torque limit value that can respond to the torque requirement, which indicates that the engine has been normally combusted and stabilized, and the completion of the vehicle start is determined. And, in an embodiment, it is not allowed to set the engine injection speed to be greater than the drag target speed of the BSG motor.
In some embodiments, the preset injection speed is less than a target drag torque of the BSG motor. By the arrangement, the actual dragging torque of the BSG motor can be adjusted, and support is provided for controlling the starting of the vehicle.
In some embodiments, the BSG motor and the engine are controlled by the same controller. The vehicle starting process is controlled by the same controller, so that NVH (noise, vibration and harshness) problems caused by control parameter conflict, mismatching and starting process shake and the like due to the fact that a plurality of controllers do not have coordinated control can be avoided.
In summary, according to the method for controlling vehicle starting according to the embodiment of the invention, in the starting process of the vehicle, starting control is performed by adopting the required total torque, in the starting process, when the engine speed is overlarge and exceeds the torque-unloading speed, the engine speed is regulated by controlling the friction torque corresponding to the required total torque relative to the target idle speed, so that the engine speed is maintained at the target idle speed, obvious and overlarge speed overshoot in the starting process is avoided, the NVH expression problem caused after the starting speed exceeds the target idle speed is improved, the fuel consumption is reduced, the starting result is determined according to the engine speed and the actual dragging torque of the BSG motor, the vehicle starting control is realized, and in the fuel injection combustion of the engine, the actual dragging torque of the BSG motor is regulated according to the engine speed and the dragging target speed of the BSG motor, so that the matching calibration of the control parameter in the starting process is facilitated, the matching calibration workload is reduced, and the matching calibration effect is improved.
A computer-readable storage medium of an embodiment of the second aspect of the present invention has stored thereon a computer program that is executed by the method of controlling the start of a vehicle mentioned in the above embodiment.
A vehicle according to an embodiment of a third aspect of the present invention is described below with reference to the accompanying drawings.
Fig. 5 is a block diagram of a vehicle according to one embodiment of the invention, as shown in fig. 5, the vehicle 10 includes an engine 11, a BSG motor 12, and a controller 13. Wherein the controller 13 is configured to control the engine 11 and the BSG motor 12 according to the method of controlling the start of the vehicle as mentioned in the above embodiments.
According to the vehicle 10 of the embodiment of the present invention, the controller 13 controls the engine 11 and the BSG motor 12 to execute the method of controlling the vehicle start mentioned in the above embodiment, and by controlling the friction torque corresponding to the required total torque relative to the target idle speed, the rotational speed adjustment of the engine 11 is realized, so that the rotational speed of the engine 11 is maintained at the target idle speed, the occurrence of significant and excessive rotational speed overshoot during the start is avoided, the NVH performance problem caused after the start rotational speed exceeds the target idle speed is improved, and the fuel consumption is reduced.
In some embodiments, the controller 13 is one of a vehicle controller and an engine controller. The same controller is used for controlling, so that NVH problems such as control parameter conflict, mismatching and starting process shake caused by the fact that a plurality of controllers do not have coordination control can be avoided.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A method of controlling vehicle launch, the vehicle including a BSG motor and an engine, the method comprising:
the starting friction torque and the BSG dragging torque required by starting are obtained according to the magnitude of the friction force required by starting, the starting of the BSG motor is controlled, the actual dragging torque of the BSG motor is larger than the starting friction torque, and the crankshaft of the engine is controlled to rotate;
when the rotation speed of the engine reaches the preset oil injection rotation speed, controlling the oil injection combustion of the engine;
controlling the engine to continuously increase the rotating speed, adjusting the actual dragging torque of the BSG motor to be gradually reduced to a zero torque value according to the rotating speed of the engine so that the starting requirement total torque is larger than the target idle speed friction torque, and adjusting the starting requirement total torque according to the rotating speed of the engine so that the rotating speed of the engine is maintained at the target idle speed, wherein the adjusting the actual dragging torque of the BSG motor according to the rotating speed of the engine gradually reduced to the zero torque value comprises the following steps: the engine speed reaches a first BSG torque-removing speed, the actual dragging torque of the BSG motor is controlled to start to be reduced until the engine speed reaches a BSG dragging target speed, and the actual dragging torque of the BSG motor is reduced to the reverse dragging torque corresponding to the dragging target speed; the engine speed is increased from the BSG dragging target speed to a second BSG torque unloading speed, and the actual dragging torque of the BSG motor is controlled to maintain the reverse dragging torque corresponding to the dragging target speed; the engine speed is increased from the second BSG torque unloading speed to the BSG torque unloading completion speed, and the actual dragging torque of the BSG motor is controlled to be reduced to a zero torque value from the reverse dragging torque corresponding to the dragging target speed;
and determining a starting result according to the engine speed and the actual dragging torque of the BSG motor.
2. The method of controlling vehicle launch according to claim 1, wherein adjusting the launch demand total torque in accordance with the engine speed such that the engine speed is maintained at a target idle speed comprises:
the speed difference between the engine speed and the target idle speed is smaller than a third threshold value and larger than a fourth threshold value, and the starting demand total torque is controlled to start to be reduced, wherein the fourth threshold value is smaller than the third threshold value;
and controlling the total torque required for starting to be reduced to friction torque corresponding to the target idle speed when the speed difference between the engine speed and the target idle speed is smaller than the fourth threshold value.
3. The method of controlling vehicle starting of claim 1, wherein determining a starting result based on the engine speed and an actual dragging torque of the BSG motor comprises:
and determining that the engine is successfully started when the engine speed reaches a set target engine speed and the actual dragging torque of the BSG motor is smaller than a BSG torque threshold responding to the torque demand.
4. The method of controlling vehicle launch according to claim 1 wherein the preset fuel injection speed is less than a target drag torque of the BSG motor.
5. The method of controlling vehicle starting of any of claims 1-4, wherein the BSG motor and the engine are controlled by the same controller.
6. A non-transitory computer storage medium having stored thereon a computer program, which when executed by a processor implements the method of controlling vehicle launch of any one of claims 1-5.
7. A vehicle, characterized in that the vehicle comprises:
an engine and a BSG motor;
a controller for controlling the engine and the BSG motor according to the method of controlling vehicle starting of any one of claims 1 to 5.
8. The vehicle of claim 7, wherein the controller is one of a vehicle controller and an engine controller.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987086A (en) * | 2006-12-08 | 2007-06-27 | 奇瑞汽车有限公司 | Method for controlling engine starting of blended power electric automobile |
| CN106080581A (en) * | 2016-08-16 | 2016-11-09 | 潍柴动力股份有限公司 | A kind of hybrid vehicle and the engine start control method of this automobile |
| CN108561256A (en) * | 2018-03-29 | 2018-09-21 | 吉利汽车研究院（宁波）有限公司 | Method for starting-controlling, the apparatus and system of light mixing system |
| CN109312705A (en) * | 2016-05-23 | 2019-02-05 | 罗伯特·博世有限公司 | The method that internal combustion engine is started by V belt translation formula starter generator |
| CN109606351A (en) * | 2018-12-24 | 2019-04-12 | 浙江吉利汽车研究院有限公司 | Engine start control method, device, entire car controller and automobile |
| CN110062710A (en) * | 2016-12-16 | 2019-07-26 | 法国大陆汽车公司 | Method for managing the transient phases of the starting of thermo-motor by electric motor |
-
2020
- 2020-07-30 CN CN202010752438.0A patent/CN114056322B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987086A (en) * | 2006-12-08 | 2007-06-27 | 奇瑞汽车有限公司 | Method for controlling engine starting of blended power electric automobile |
| CN109312705A (en) * | 2016-05-23 | 2019-02-05 | 罗伯特·博世有限公司 | The method that internal combustion engine is started by V belt translation formula starter generator |
| CN106080581A (en) * | 2016-08-16 | 2016-11-09 | 潍柴动力股份有限公司 | A kind of hybrid vehicle and the engine start control method of this automobile |
| CN110062710A (en) * | 2016-12-16 | 2019-07-26 | 法国大陆汽车公司 | Method for managing the transient phases of the starting of thermo-motor by electric motor |
| CN108561256A (en) * | 2018-03-29 | 2018-09-21 | 吉利汽车研究院（宁波）有限公司 | Method for starting-controlling, the apparatus and system of light mixing system |
| CN109606351A (en) * | 2018-12-24 | 2019-04-12 | 浙江吉利汽车研究院有限公司 | Engine start control method, device, entire car controller and automobile |
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