CN110654369A - Hybrid vehicle engine starting control method and device and computer equipment - Google Patents
Hybrid vehicle engine starting control method and device and computer equipment Download PDFInfo
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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
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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
- B60W10/08—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
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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
- B60W10/24—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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0803—Circuits or control means specially adapted for starting of engines characterised by means for initiating engine start or stop
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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
- 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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/08—Electric propulsion units
- B60W2510/083—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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
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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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- Transportation (AREA)
- Automation & Control Theory (AREA)
- General Engineering & Computer Science (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The application provides a hybrid vehicle engine starting control method and device and computer equipment. The method comprises the following steps: detecting whether a clutch in a vehicle is currently in an off state when it is determined that an engine start condition is currently satisfied; if the clutch is currently in a disconnected state, judging whether the current allowable discharge power of a power battery in the vehicle is larger than a first threshold value; and if the current allowable discharge power of the power battery is larger than a first threshold value, starting a belt transmission starting motor to drag the engine to start. By the method, the engine is quickly started, the starting process is simplified, the capacity utilization efficiency is improved, the abrasion of the clutch is reduced, and the technical problems of low energy utilization rate and easy abrasion of the clutch in the prior art are solved.
Description
Technical Field
The application relates to the technical field of vehicle control, in particular to a hybrid vehicle engine starting control method and device and computer equipment.
Background
With the development of scientific technology, Hybrid Electric Vehicle (HEV) technology is becoming more mature. Considering various factors such as economy and cruising ability, compared with fuel vehicles and pure electric vehicles, hybrid vehicles are more favored by consumers.
In the engine start method of the HEV vehicle, a Dual Clutch Transmission (DCT) is used for reverse-traction start, which is a common method for starting the engine. Fig. 1 is a schematic structural diagram of an engine starting scheme of a conventional HEV vehicle. The applicant has found that when starting the engine with DCT reverse-drag starting, the energy flow is transferred through the power battery-drive motor-wheel-clutch-engine process, as indicated by the arrow in fig. 1. In the starting mode, the energy utilization efficiency is low due to the long transmission chain, the combination of the clutch is required for increasing the rotating speed of the engine, and the clutch abrasion is accelerated when the engine is frequently started, so that the service life of the clutch is influenced.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
The application provides a hybrid vehicle engine starting control method in a first aspect, and aims to solve the technical problems that in the prior art, the energy utilization rate is low and a clutch is prone to wear.
A second aspect of the present application provides a hybrid vehicle engine start control apparatus.
A third aspect of the present application provides a computer device.
A fourth aspect of the present application is directed to a computer-readable storage medium.
A fifth aspect of the present application proposes a computer program product.
An embodiment of a first aspect of the present application provides a hybrid vehicle engine start control method, including:
detecting whether a clutch in a vehicle is currently in an off state when it is determined that an engine start condition is currently satisfied;
if the clutch is currently in a disconnected state, judging whether the current allowable discharge power of a power battery in the vehicle is larger than a first threshold value;
and if the current allowable discharge power of the power battery is larger than a first threshold value, starting a belt transmission starting motor to drag the engine to start.
According to the engine starting control method of the hybrid electric vehicle, when the engine starting condition is determined to be met currently, whether a clutch in the vehicle is in a disconnection state or not is detected, when the clutch is in the disconnection state, whether the current allowable discharging power of a power battery in the vehicle is larger than a first threshold value or not is further judged, and when the allowable discharging power is larger than the first threshold value, a belt transmission starting motor is started to drag the engine to start. Therefore, the engine is dragged to start by starting the belt transmission starting motor, the belt transmission starting motor is directly connected with the engine crankshaft through the belt, the starting path is short, the clutch is not needed, the engine is started quickly, the starting process is simplified, the capacity utilization efficiency is improved, and the abrasion of the clutch is reduced. In addition, compared with the mode of starting the engine by the existing starter, the method provided by the application realizes the dual functions of the power generation inverter and the starter by utilizing the belt transmission starting motor, and the air-fuel ratio is not required to be increased when the engine is started, so that the starting noise and the oil consumption are reduced, and the economical efficiency of a vehicle is improved.
An embodiment of a second aspect of the present application provides a hybrid vehicle engine start control apparatus, including:
the device comprises a detection module, a judgment module and a control module, wherein the detection module is used for detecting whether a clutch in a vehicle is in a disconnection state currently when determining that an engine starting condition is met currently;
the judging module is used for judging whether the current allowable discharging power of a power battery in the vehicle is larger than a first threshold value when the clutch is in a disconnection state;
and the starting module is used for starting the belt transmission starting motor to drag the engine to start when the current allowable discharge power of the power battery is greater than a first threshold value.
The hybrid vehicle engine starting control device provided by the embodiment of the application detects whether a clutch in a vehicle is in a disconnection state at present when the engine starting condition is determined to be met at present, further judges whether the current allowable discharging power of a power battery in the vehicle is larger than a first threshold value when the clutch is in the disconnection state, and starts a belt transmission starting motor to drag an engine to start when the allowable discharging power is larger than the first threshold value. Therefore, the engine is dragged to start by starting the belt transmission starting motor, the belt transmission starting motor is directly connected with the engine crankshaft through the belt, the starting path is short, the clutch is not needed, the engine is started quickly, the starting process is simplified, the capacity utilization efficiency is improved, and the abrasion of the clutch is reduced. In addition, compared with the mode of starting the engine by the existing starter, the method provided by the application realizes the dual functions of the power generation inverter and the starter by utilizing the belt transmission starting motor, and the air-fuel ratio is not required to be increased when the engine is started, so that the starting noise and the oil consumption are reduced, and the economical efficiency of a vehicle is improved.
An embodiment of a third aspect of the present application provides a computer device, including: a memory storing a computer program and a processor implementing the hybrid vehicle engine start control method according to the embodiment of the first aspect when the processor executes the program.
An embodiment of a fourth aspect of the present application proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the hybrid vehicle engine start control method as described in the embodiment of the first aspect.
An embodiment of a fifth aspect of the present application proposes a computer program product, wherein when instructions of the computer program product are executed by a processor, the hybrid vehicle engine start control method according to the embodiment of the first aspect is implemented.
Additional aspects and advantages of the present application 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 present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a prior art engine starting scheme for a HEV vehicle;
fig. 2 is a schematic structural diagram of a hybrid vehicle according to an embodiment of the present application;
FIG. 3 is a schematic flow chart illustrating a method for controlling engine start of a hybrid vehicle according to an embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating another method for controlling engine start in a hybrid vehicle according to an embodiment of the present disclosure;
FIG. 5 is a schematic flow chart illustrating a method for controlling engine start of a hybrid vehicle according to an embodiment of the present application;
FIG. 6 is a diagram illustrating an exemplary process for implementing a BSG motor starter generator according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of an engine start control device of a hybrid vehicle according to an embodiment of the present application;
FIG. 8 is a schematic structural diagram of another hybrid vehicle engine start control device according to an embodiment of the present application;
FIG. 9 is a schematic structural diagram of an engine start control device of a hybrid vehicle according to an embodiment of the present application; and
fig. 10 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The hybrid vehicle engine start control method, apparatus, and computer device of the embodiments of the present application are described below with reference to the accompanying drawings.
At present, there are two main ways of starting the engine of the HEV vehicle, one is starting the starter, and the other is starting the DCT in reverse drag, as shown in fig. 1. The starter is started by means of the starter, energy is provided by a low-voltage battery of the whole vehicle, and the engine is ignited and started after the rotating speed of the engine is increased by combining with an engine flywheel. The DCT is started in a reverse dragging mode, the DCT is combined with a clutch (namely a double-clutch gearbox in figure 1) through the DCT, a driving motor compensates torque to wheels while maintaining normal driving of the vehicle, and after the engine is dragged to a certain rotating speed, the engine is ignited and started.
However, when the starter is used to start the engine, the power of the starter is low, and the engine can only be dragged to a lower rotation speed, and compared with high-rotation-speed oil injection ignition, the engine needs to enrich the air-fuel ratio when the engine is in low-rotation-speed oil injection ignition, which may cause the problems of high starting noise and high oil consumption. When the DCT is adopted to reversely drag and start the engine, as can be seen from figure 1, the energy flow transmission chain is long, so that the energy utilization efficiency is low, the rotating speed of the engine needs to be increased by combining the clutch, the abrasion of the clutch can be accelerated when the engine is frequently started and stopped, and the service life of the clutch is influenced.
In view of the above problems, an embodiment of the present application provides a method for controlling starting of an engine of a hybrid vehicle, so as to improve energy utilization efficiency, reduce wear of a clutch, and reduce starting noise and oil consumption.
In order to implement the method for controlling the engine start of the hybrid vehicle according to the embodiment of the present application, the embodiment of the present application firstly provides a hybrid vehicle, fig. 2 is a schematic structural diagram of the hybrid vehicle according to the embodiment of the present application, and the method for controlling the engine start of the hybrid vehicle according to the embodiment of the present application can be applied to the hybrid vehicle shown in fig. 2 to improve the energy utilization efficiency, reduce the wear of the clutch, and reduce the start noise and the oil consumption.
As shown in fig. 2, in the hybrid vehicle according to the embodiment of the present invention, a Belt-driven Starter Generator (BSG) is installed at an accessory drive system end of a front end of an engine, and when the engine needs to be started, energy is supplied from a power battery, and the BSG is used to output torque to drive the engine to a high rotation speed through Belt drive, and then the engine is started by oil injection and ignition. As can be seen from fig. 2, the BSG motor directly drags the engine through the belt, and the transmission path of the energy flow is short, thereby improving the capacity utilization efficiency. The BSG motor is powered by the power battery, under the condition that the power of the BSG motor is enough, the engine can be dragged to a high-rotating-speed running state from a stop state within hundreds of milliseconds, the ignition success rate of the engine is high, the engine is started quickly, the fuel consumption of the engine can be reduced by matching with an intelligent start-stop strategy of the whole vehicle, and the economy of the whole vehicle is improved.
The following further describes, with reference to a specific flowchart, an implementation process of the hybrid vehicle engine start control method provided in the embodiment of the present application.
Fig. 3 is a schematic flow chart of an engine start control method for a hybrid vehicle according to an embodiment of the present application, which may be executed by a vehicle control unit of the hybrid vehicle, and for convenience of description, the following embodiments are each explained by taking the vehicle control unit executing the engine start control method for the hybrid vehicle according to the embodiment of the present application as an example.
As shown in fig. 3, the hybrid vehicle engine start control method may include the steps of:
in step 101, upon determining that an engine start condition is currently satisfied, it is detected whether a clutch in a vehicle is currently in an open state.
The engine start condition may be, for example, a vehicle start HEV mode, a vehicle charge request, or the like.
In the present embodiment, when it is determined that the vehicle currently satisfies the engine start condition, it is further detected whether a clutch in the vehicle is currently in an open state.
In some possible implementations of the embodiments of the present application, whether the vehicle satisfies the engine start condition may be determined in various ways.
As one example, when a hybrid electric vehicle mode switch command is acquired, it is determined that an engine start condition is currently satisfied. The hybrid electric vehicle is provided with an HEV switching button, when a user presses the button, a vehicle control unit of the hybrid electric vehicle acquires a mode switching instruction of the hybrid electric vehicle, and at the moment, the hybrid electric vehicle can be determined to meet the engine starting condition currently.
As one example, when the current remaining charge of the power battery in the vehicle is less than a second threshold, then it is determined that the engine start condition is currently satisfied. The second threshold may be preset, for example, the second threshold may be set to 10%, and when the current remaining capacity of the power battery is lower than 10%, it is determined that the power battery needs to be charged, and it is determined that the engine start condition is currently satisfied.
As an example, if it is monitored that the depth of an accelerator pedal in the vehicle is greater than a third threshold and the current remaining capacity of the power battery is less than a fourth threshold and greater than a second threshold when the vehicle is in a stopped state, it is determined that an engine start condition is currently satisfied, that is, a user currently presses the accelerator pedal to actively generate power for starting the engine, so as to charge the power battery. And the power generation power of the generator is increased along with the increase of the depth of the accelerator pedal.
The third threshold and the fourth threshold may be preset, for example, may be set by a developer according to experience, the third threshold may be set to 30%, and the fourth threshold may be set to 80%, 100%, or the like. Further, when it is determined that the hybrid vehicle currently satisfies the engine start condition, the vehicle control unit continues to detect whether a clutch in the vehicle is currently in an off state.
And 102, if the clutch is in the disconnection state at present, judging whether the current allowable discharge power of the power battery in the vehicle is larger than a first threshold value.
In the present embodiment, when it is determined that the clutch is in the disconnected state, it may be further determined whether the currently allowable discharge power of the power battery in the vehicle is greater than the first threshold value.
The first threshold may be preset, for example, the first threshold may be set as a minimum power required for dragging the BSG motor, so as to ensure that the current allowable discharge power of the power battery can meet the power requirement when the BSG motor operates.
And 103, if the current allowable discharge power of the power battery is greater than a first threshold value, starting a belt transmission starting motor to drag the engine to start.
In the embodiment, when the clutch is determined to be in the disconnected state and the current allowable discharge power of the power battery is greater than a first threshold value, the belt transmission starting motor can be controlled to start, so that the belt transmission starting motor drags the engine to rotate through a belt, and when the rotating speed of the engine reaches a preset ignition target rotating speed, the engine executes oil injection ignition operation and starts after ignition is successful; when the current residual capacity of the power battery is smaller than the first threshold value, the current residual capacity of the power battery is considered to be incapable of driving the belt transmission starting motor to start, and at the moment, the vehicle control unit can finish the process of dragging the engine to start by the BSG motor. Therefore, the problem that when the electric quantity of the power battery is not enough to drive the BSG motor, the BSG motor is still supplied with the electric quantity to try to drive the BSG motor, the electric quantity is wasted, and the electric quantity consumption of the power battery is saved.
By detecting the state of the clutch, the subsequent operation is executed when the clutch is in a disconnected state, so that the BSG motor can be prevented from dragging more loads, and the electric quantity can be saved.
Further, before the engine operates autonomously, the vehicle control unit controls the BSG motor to be in a monitoring state, and when the rotating speed of the engine drops to be lower than the ignition target rotating speed, the BSG motor drags the engine again until the engine is ignited successfully or the engine is started overtime.
In a possible implementation manner of the embodiment of the application, after the belt-driven starter motor is started to drag the generator, whether the actual rotating speed of the engine reaches the target ignition rotating speed within the second preset time can be further judged, and if not, the belt-driven starter motor is controlled to stop. The second preset time may be preset, for example, set to 8 seconds, 10 seconds, or the like. When the actual rotating speed of the engine fails to reach the target ignition rotating speed within the second preset time, the belt transmission starting motor is controlled to stop dragging the engine, so that the electric quantity of the power battery is saved, the waiting time of a user is reduced, and the user experience is improved.
In a possible implementation manner of the embodiment of the application, after the belt-driven starter motor is started to drag the engine, if an ignition success signal sent by the engine is acquired within a third preset time, the belt-driven starter motor is controlled to stop. The third preset time may be preset, for example, the third preset time may be set to 12 seconds; the ignition success signal may include an ignition signal and a BSG motor enable signal. And after the vehicle control unit receives the ignition signal within the third preset time, continuously acquiring a BSG (brake system activation) quitting permission signal sent by the engine, and if the vehicle control unit receives the ignition signal and the BSG motor quitting permission signal within the third preset time, the vehicle control unit controls the belt transmission starting motor to stop if the engine can autonomously operate. By controlling the belt transmission starting motor to stop after receiving the ignition success signal, the belt transmission starting motor can be prevented from being continuously in a working state, and therefore the electric quantity of the power battery is saved.
The hybrid vehicle engine starting control method of the embodiment detects whether a clutch in a vehicle is in a disconnection state currently when the engine starting condition is determined to be met currently, further judges whether the current allowable discharging power of a power battery in the vehicle is larger than a first threshold value when the clutch is in the disconnection state, and starts a belt transmission starting motor to drag an engine to start when the allowable discharging power is larger than the first threshold value. Therefore, the engine is dragged to start by starting the belt transmission starting motor, the belt transmission starting motor is directly connected with the engine crankshaft through the belt, the starting path is short, the clutch is not needed, the engine is started quickly, the starting process is simplified, the capacity utilization efficiency is improved, and the abrasion of the clutch is reduced. In addition, compared with the mode of starting the engine by the existing starter, the method provided by the application realizes the dual functions of the power generation inverter and the starter by utilizing the belt transmission starting motor, and the air-fuel ratio is not required to be increased when the engine is started, so that the starting noise and the oil consumption are reduced, and the economical efficiency of a vehicle is improved.
FIG. 4 is a flowchart illustrating another engine start control method for a hybrid vehicle according to an embodiment of the present disclosure.
As shown in fig. 4, the hybrid vehicle engine start control method may include the steps of:
In this embodiment, when it is determined that the engine start condition is currently satisfied, the vehicle control unit may detect whether a clutch in the vehicle is currently in a disconnected state.
In the embodiment, when it is determined that the clutch is in the off state, it is continuously determined whether the allowable discharge power of the power battery in the vehicle is greater than the first threshold.
And step 204, judging whether the current driving capacity of the belt drive starting motor is larger than the current target starting torque of the engine, if so, executing step 205, otherwise, executing step 208.
In this embodiment, when it is determined that the current allowable discharge power of the power battery is greater than the first threshold, it is further determined whether the current driving capability of the belt-driven starter motor is greater than the current target starting torque of the engine. The current driving capacity of the belt-driven starter motor is determined by the current residual capacity of the power battery and the self efficiency of the belt-driven starter motor. After the energy consumption of the belt transmission starting motor is subtracted from the current residual electric quantity of the power battery, the current residual electric quantity is multiplied by the efficiency of the belt transmission starting motor, and the current driving capacity of the belt transmission starting motor can be obtained. And comparing the obtained driving capacity with the current target starting torque of the engine, and if the driving capacity of the belt transmission starting motor is larger than the current target starting torque of the engine, determining that the belt transmission starting motor is capable of driving the engine currently.
And step 206, starting a belt transmission starting motor to drag the engine to start.
In this embodiment, when it is determined that the hybrid vehicle currently satisfies the engine start condition, the current target start torque of the engine may be determined according to the current temperature of the engine. And then the torque loading slope corresponding to the belt transmission starting motor can be determined, so that the belt transmission starting motor is controlled to output torque to drive the engine to start according to the determined torque loading slope.
As an example, a corresponding relationship between the engine water temperature and the starting torque may be stored in advance, and when the current engine water temperature is obtained, the corresponding target starting torque may be determined by querying the corresponding relationship. For example, the prestored correspondence relationship between the engine water temperature and the starting torque is: when the water temperature of the engine is higher than A1 ℃, the starting torque is T1 Newton meters (Nm); when the water temperature of the engine is less than or equal to A1 ℃, the starting torque is T2 Newton meters. Wherein T1 is less than T2. Assuming that a1 is 20, the target cranking torque is determined to be T2Nm when the current water temperature of the engine is 18 ℃.
In this embodiment, the torque loading slope is mainly determined by the mechanical properties of the gear train structure connecting the engine and the belt drive starting motor and the mechanical properties of the BSG motor, the better the mechanical properties of the gear train structure and the BSG motor are, the larger the torque loading slope is, the faster the speed of the torque output by the belt drive starting motor is, and thus the faster the engine speed changes. The torque loading ramp rate may be pre-stored in the hybrid vehicle by the manufacturer. When the vehicle controller determines that the vehicle currently meets the engine starting condition, the torque loading slope of the belt transmission starting motor can be directly obtained.
In this embodiment, before starting the belt-driven starter motor, it is determined that the belt-driven starter motor is not faulty, that is, it is determined that the belt-driven starter motor can normally operate.
And step 207, controlling the torque output by the belt transmission starting motor according to the torque loading slope.
In this embodiment, when it is further determined that the current driving capability of the belt-driven starter motor is greater than the current target starting torque of the engine, the belt-driven starter motor is started to drag the engine to start. After the belt transmission starting motor is started, the vehicle control unit controls the torque output by the belt transmission starting motor according to the torque loading slope corresponding to the BSG motor.
It can be appreciated that the greater the torque loading ramp rate of the belt-driven starter motor, the shorter the time the belt-driven starter motor output reaches the target torque.
In step 208, the engine shutdown state is maintained.
In this embodiment, when the clutch of the vehicle is not in the disconnected state, or the current allowable discharge power of the power battery is less than or equal to the first threshold, or the current driving capability of the belt-driven starter motor is not greater than the current target starting torque of the engine, the belt-driven starter motor is not started to drag the engine to start, so that the engine is maintained in the stopped state.
According to the hybrid vehicle engine starting control method, when the fact that the clutch of the vehicle is in a disconnected state is determined, the current allowable discharging power of a power battery is larger than a first threshold value, the current driving capacity of a belt transmission starting motor is larger than the current target starting torque of the engine, the belt transmission starting motor is started to drag the engine to be started, after the belt transmission starting motor is started, the torque output by the belt transmission starting motor is controlled according to the torque loading slope corresponding to the belt transmission starting motor, the belt transmission starting motor can be guaranteed to be capable of successfully dragging the engine, and energy waste caused by starting of the belt transmission starting motor when the belt transmission starting motor does not have the capacity of dragging the engine to be avoided. Through obtaining the moment of torsion loading slope that the BSG motor corresponds, come the moment of torsion of control belt transmission starter motor output according to moment of torsion loading slope, can guarantee the engine starting speed when, guarantee the smoothness of engine starting process, promote user's driving impression.
In order to more clearly illustrate the specific implementation process of starting the belt-driven starter motor to drive the engine to start in the foregoing embodiment, another hybrid vehicle engine start control method is provided in the embodiment of the present application, and fig. 5 is a schematic flow chart of another hybrid vehicle engine start control method provided in the embodiment of the present application.
As shown in fig. 5, based on the foregoing embodiment, starting the belt-driven starter motor to drag the engine to start may include the steps of:
And step 302, adjusting the torque output by the belt transmission starting motor according to the difference value between the actual rotating speed of the engine and the target ignition rotating speed.
In this embodiment, after the belt-driven starter motor is started, the vehicle control unit may monitor an actual rotation speed of the engine in real time, calculate a difference between the actual rotation speed and a target ignition rotation speed of the engine, and adjust a torque output by the belt-driven starter motor according to the obtained difference.
As an example, a correspondence relationship between a difference between an actual rotation speed of the engine and a target ignition rotation speed, and a torque attenuation coefficient k, where k is a real number greater than and less than 1, may be stored in advance, and the larger the difference, the larger the value of k. Furthermore, after the difference between the actual rotation speed of the engine and the target ignition rotation speed is determined, a torque attenuation coefficient k can be determined by inquiring the corresponding relation, and the final output torque of the belt transmission starting motor can be adjusted by using the torque attenuation coefficient k, wherein the final output torque of the belt transmission starting motor is T x k, and T is the target starting torque. Therefore, when the actual rotating speed of the engine is close to the target ignition rotating speed of the engine, the torque output by the belt transmission starting motor can be reduced, and the aim of saving the electric quantity of the power battery is fulfilled.
In a possible implementation manner of the embodiment of the application, when the torque output by the belt drive starting motor is adjusted according to the difference between the actual rotating speed of the engine and the target ignition rotating speed, whether the actual rotating speed of the engine reaches the target rotating speed within the first preset time can be further judged, wherein the target rotating speed is less than the target ignition rotating speed. The first preset time and the target rotation speed may be set as needed, for example, the first preset time is set to 2 seconds, the target rotation speed is set to 200rms, or the target rotation speed may be set to 30%, 50%, etc. of the target ignition speed; if not, further judging whether the current output torque of the belt transmission starting motor is smaller than the current driving capability of the belt transmission starting motor; and if the current output torque is smaller than the current driving capability, increasing the current output torque of the belt transmission starting motor. Therefore, under the condition that the driving capability of the belt transmission starting motor is not exceeded, the torque output by the belt transmission starting motor can be moderately increased, so that the engine reaches the target ignition rotating speed as soon as possible, the engine starting time is saved, and the engine starting speed is increased.
According to the control method for starting the engine of the hybrid electric vehicle, after the belt transmission starting motor is started, the actual rotating speed of the engine is monitored, and the torque output by the belt transmission starting motor is adjusted according to the difference value between the actual rotating speed of the engine and the target ignition rotating speed, so that the starting speed of the engine can be guaranteed, and meanwhile, the electric quantity of a power battery can be saved.
Fig. 6 is a diagram illustrating an exemplary execution flow of the BSG motor starter generator according to an embodiment of the present disclosure. As shown in fig. 6, after the BSG motor is started, the vehicle controller first determines whether the rotation speed of the engine reaches the target rotation speed within time t1, and if not, controls the BSG motor to stop, and exits from the process of starting the engine by the BSG motor; if yes, further judging whether an ignition signal sent by the engine is received or not (namely the engine reaches the target ignition rotating speed) within the time t2, and if not, controlling the BSG motor to stop; if the ignition signal is received, further judging whether a BSG motor quitting allowing signal sent by the engine is received within t3 time, and if the BSG motor quitting allowing signal is not received, controlling the BSG motor to stop; and if so, the BSG motor drags the engine to be started successfully, and the BSG motor is controlled to stop. Wherein t1, t2 and t3 can be preset, and t1< t2< t 3. The vehicle control unit considers that the engine is started successfully after receiving the BSG motor quitting allowing signal sent by the engine, so that the starting success rate of the engine is improved.
In order to realize the above embodiment, the present application also proposes a hybrid vehicle engine start control device.
Fig. 7 is a schematic structural diagram of an engine start control device of a hybrid vehicle according to an embodiment of the present application.
As shown in fig. 7, the hybrid vehicle engine start control device 70 includes: a detection module 710, a determination module 720, and an activation module 730.
The detecting module 710 is configured to detect whether a clutch in a vehicle is currently in an off state when it is determined that an engine start condition is currently satisfied.
In one possible implementation manner of the embodiment of the present application, determining that the engine start condition is currently satisfied includes: if a mode switching instruction of the hybrid electric vehicle is acquired, determining that the engine starting condition is met currently; or if the current residual capacity of a power battery in the vehicle is smaller than a second threshold value, determining that the engine starting condition is met currently; or if the vehicle is currently in a parking state, the depth of an accelerator pedal in the vehicle is greater than a third threshold value, and the current remaining capacity of a power battery is less than a fourth threshold value, determining that the engine starting condition is currently met. The second threshold, the third threshold, and the fourth threshold may be preset.
The determining module 720 is configured to determine whether the currently allowable discharging power of the power battery in the vehicle is greater than a first threshold when the clutch is currently in the disconnected state.
The first threshold may be preset, for example, the first threshold may be set as a minimum discharge power required for dragging the BSG motor, so as to ensure that the current allowable discharge power of the power battery can drag the BSG motor.
The starting module 730 is used for starting the belt transmission starting motor to drag the engine to start when the current allowable discharge power of the power battery is larger than a first threshold value.
Further, in a possible implementation manner of the embodiment of the present application, as shown in fig. 8, on the basis of the embodiment shown in fig. 7, the hybrid vehicle engine start control device 70 further includes:
the first determination module 700 is used for determining the current target starting torque of the engine according to the current temperature of the engine when the engine starting condition is determined to be met currently; and determining a torque loading slope corresponding to the belt drive starting motor.
The second determination module 740 is configured to determine that the current driving capability of the belt-driven starter motor is greater than the current target starting torque of the engine.
And a control module 750 configured to control the torque output by the belt-driven starter motor according to the torque loading ramp rate after the belt-driven starter motor is started.
The torque loading slope corresponding to the belt transmission starting motor is obtained, the torque output by the belt transmission starting motor is controlled according to the torque loading slope, the starting speed of the engine can be guaranteed, the smoothness of the starting process of the engine can be guaranteed, and the driving feeling of a user can be improved.
In a possible implementation manner of the embodiment of the present application, the control module 750 is further configured to determine whether the actual rotation speed of the engine reaches the target ignition rotation speed within a second preset time; if not, controlling the belt transmission starting motor to stop. The second preset time may be preset, for example, set to 8 seconds, 10 seconds, or the like.
When the actual rotating speed of the engine fails to reach the target ignition rotating speed within the second preset time, the belt transmission starting motor is controlled to stop dragging the engine, so that the electric quantity of the power battery is saved, the waiting time of a user is reduced, and the user experience is improved.
In a possible implementation manner of the embodiment of the present application, the control module 750 is further configured to control the belt drive starter motor to stop if an ignition success signal sent by the engine is acquired within a third preset time. The third preset time may be preset, for example, the third preset time may be set to 12 seconds; the ignition success signal may include an ignition signal and a BSG motor enable signal.
By controlling the belt transmission starting motor to stop after receiving the ignition success signal, the belt transmission starting motor can be prevented from being continuously in a working state, and therefore the electric quantity of the power battery is saved.
In a possible implementation manner of the embodiment of the present application, as shown in fig. 9, on the basis of the embodiment shown in fig. 7, the starting module 730 includes:
and the monitoring unit 731 is used for monitoring the actual rotating speed of the engine after the belt transmission starting motor is started.
And an adjusting unit 732, configured to adjust a torque output by the belt-driven starter motor according to a difference between an actual rotation speed of the engine and the target ignition rotation speed.
In a possible implementation manner of the embodiment of the present application, the adjusting unit 732 is specifically configured to determine whether an actual rotation speed of the engine reaches a target rotation speed within a first preset time, where the target rotation speed is less than a target ignition rotation speed; wherein, the first preset time may be preset, for example, set to 2 seconds, 3 seconds, etc., and the target rotation speed may also be set as required, for example, set to 20%, 50%, etc. of the target ignition rotation speed; if not, judging whether the current output torque of the belt transmission starting motor is smaller than the current driving capability of the belt transmission starting motor; if the current output torque is smaller than the preset torque, increasing the current output torque of the belt transmission starting motor. Therefore, under the condition that the driving capability of the belt transmission starting motor is not exceeded, the torque output by the belt transmission starting motor can be moderately increased, so that the engine reaches the target ignition rotating speed as soon as possible, the engine starting time is saved, and the engine starting speed is increased.
The actual rotating speed of the engine is monitored after the belt transmission starting motor is started, and the torque output by the belt transmission starting motor is adjusted according to the difference value between the actual rotating speed of the engine and the target ignition rotating speed, so that the starting speed of the engine can be guaranteed, and meanwhile, the electric quantity of a power battery is saved.
It should be noted that the foregoing explanation of the embodiment of the engine start control method for a hybrid vehicle is also applicable to the engine start control device for a hybrid vehicle in the embodiment, and the implementation principle is similar, and will not be described herein again.
The hybrid vehicle engine starting control device of the embodiment detects whether a clutch in a vehicle is in a disconnection state currently when the engine starting condition is determined to be met currently, further judges whether the current allowable discharging power of a power battery in the vehicle is larger than a first threshold value when the clutch is in the disconnection state, and starts a belt transmission starting motor to drag an engine to start when the allowable discharging power is larger than the first threshold value. Therefore, the engine is dragged to start by starting the belt transmission starting motor, the belt transmission starting motor is directly connected with the engine crankshaft through the belt, the starting path is short, the clutch is not needed, the engine is started quickly, the starting process is simplified, the capacity utilization efficiency is improved, and the abrasion of the clutch is reduced. In addition, compared with the mode of starting the engine by the existing starter, the method provided by the application realizes the dual functions of the power generation inverter and the starter by utilizing the belt transmission starting motor, and the air-fuel ratio is not required to be increased when the engine is started, so that the starting noise and the oil consumption are reduced, and the economical efficiency of a vehicle is improved.
In order to implement the above embodiments, the present application also provides a computer device.
Fig. 10 is a schematic structural diagram of a computer device according to an embodiment of the present application. As shown in fig. 10, the computer apparatus 50 includes: memory 510 and processor 520, memory 510 storing computer program 530, when executed by processor 520, implements the hybrid vehicle engine start control method as described in the previous embodiments.
In order to achieve the above-described embodiments, the present application also proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the hybrid vehicle engine start control method as described in the foregoing embodiments.
In order to implement the above-mentioned embodiments, the present application also proposes a computer program product, which when the instructions in the computer program product are executed by a processor, implements the hybrid vehicle engine start control method as described in the foregoing embodiments.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (12)
1. A hybrid vehicle engine start control method characterized by comprising:
detecting whether a clutch in a vehicle is currently in an off state when it is determined that an engine start condition is currently satisfied;
if the clutch is currently in a disconnected state, judging whether the current allowable discharge power of a power battery in the vehicle is larger than a first threshold value;
and if the current allowable discharge power of the power battery is larger than a first threshold value, starting a belt transmission starting motor to drag the engine to start.
2. The method of claim 1, wherein prior to said activating said belt-driven starter motor to pull said engine to start, further comprising:
and determining the current driving capacity of the belt transmission starting motor to be larger than the current target starting torque of the engine.
3. The method of claim 2, wherein after determining that an engine start condition is currently satisfied, further comprising:
and determining the current target starting torque of the engine according to the current temperature of the engine.
4. The method of claim 1, wherein said determining that an engine start condition is currently satisfied comprises:
if a mode switching instruction of the hybrid electric vehicle is acquired, determining that the engine starting condition is met currently;
or,
if the current residual capacity of a power battery in the vehicle is smaller than a second threshold value, determining that the engine starting condition is met currently;
or,
and if the vehicle is in a parking state currently, the depth of an accelerator pedal in the vehicle is greater than a third threshold value, and the current residual capacity of the power battery is less than a fourth threshold value, determining that an engine starting condition is met currently.
5. The method of any of claims 1-4, wherein prior to said activating said belt-driven starter motor to pull said engine to start, further comprising:
determining a torque loading slope corresponding to the belt transmission starting motor;
after the belt drive starter motor is started, the method comprises the following steps:
and controlling the torque output by the belt transmission starting motor according to the torque loading slope.
6. The method of any of claims 1-4, wherein said activating the belt-driven starter motor to pull the engine to start comprises:
after the belt transmission starting motor is started, monitoring the actual rotating speed of the engine;
and adjusting the torque output by the belt transmission starting motor according to the difference value between the actual rotating speed of the engine and the target ignition rotating speed.
7. The method of claim 6, wherein after monitoring the actual speed of the engine, further comprising:
judging whether the actual rotating speed of the engine reaches the target rotating speed within first preset time, wherein the target rotating speed is less than the target ignition rotating speed;
if not, judging whether the torque currently output by the belt transmission starting motor is smaller than the current driving capability of the belt transmission starting motor or not;
and if so, increasing the torque currently output by the belt transmission starting motor.
8. The method of any of claims 1-4, wherein said activating said belt-driven starter motor to pull said engine on after starting, further comprises:
judging whether the actual rotating speed of the engine reaches the target ignition rotating speed within second preset time;
if not, controlling the belt transmission starting motor to stop.
9. The method of any of claims 1-4, wherein said activating said belt-driven starter motor to pull said engine on after starting, further comprises:
and if an ignition success signal sent by the engine is acquired within a third preset time, controlling the belt drive starting motor to stop.
10. A hybrid vehicle engine start control device characterized by comprising:
the device comprises a detection module, a judgment module and a control module, wherein the detection module is used for detecting whether a clutch in a vehicle is in a disconnection state currently when determining that an engine starting condition is met currently;
the judging module is used for judging whether the current allowable discharging power of a power battery in the vehicle is larger than a first threshold value when the clutch is in a disconnection state;
and the starting module is used for starting the belt transmission starting motor to drag the engine to start when the current allowable discharge power of the power battery is greater than a first threshold value.
11. A computer device, comprising: a memory storing a computer program and a processor, characterized in that when the processor executes the program, the hybrid vehicle engine start control method according to any one of claims 1 to 9 is implemented.
12. A computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements a hybrid vehicle engine start control method according to any one of claims 1 to 9.
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| CN112706754A (en) * | 2021-01-26 | 2021-04-27 | 上汽通用五菱汽车股份有限公司 | Hybrid vehicle, engine starting method, and computer-readable storage medium |
| CN112706754B (en) * | 2021-01-26 | 2022-07-29 | 上汽通用五菱汽车股份有限公司 | Hybrid vehicle, engine starting method, and computer-readable storage medium |
| CN113147732A (en) * | 2021-03-23 | 2021-07-23 | 重庆金康赛力斯新能源汽车设计院有限公司 | Engine starting control method and device, storage medium and computer equipment |
| CN113246960A (en) * | 2021-05-19 | 2021-08-13 | 上汽通用五菱汽车股份有限公司 | Engine cold start method, automobile and computer readable storage medium |
| CN113685299A (en) * | 2021-09-08 | 2021-11-23 | 馨联动力(曲阜)有限公司 | Low-temperature cold start control method for P-gear engine of hybrid electric vehicle |
| CN114837868A (en) * | 2022-05-23 | 2022-08-02 | 中国第一汽车股份有限公司 | Engine starting control method and device, vehicle and storage medium |
| CN114837868B (en) * | 2022-05-23 | 2024-05-03 | 中国第一汽车股份有限公司 | Engine starting control method and device, vehicle and storage medium |
| CN114837869A (en) * | 2022-05-25 | 2022-08-02 | 中国第一汽车股份有限公司 | Start-up control method, device, terminal, vehicle and medium |
| CN114837869B (en) * | 2022-05-25 | 2023-10-27 | 中国第一汽车股份有限公司 | Start control method, device, terminal, vehicle and medium |
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