CN112918462A - Hybrid electric vehicle engine starting control method and system and vehicle - Google Patents
Hybrid electric vehicle engine starting control method and system and vehicle Download PDFInfo
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- CN112918462A CN112918462A CN201911234699.7A CN201911234699A CN112918462A CN 112918462 A CN112918462 A CN 112918462A CN 201911234699 A CN201911234699 A CN 201911234699A CN 112918462 A CN112918462 A CN 112918462A
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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
- B60W20/50—Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
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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
- 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
- B60W2510/081—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
- B60W2710/0616—Position of fuel or air injector
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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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- Combustion & Propulsion (AREA)
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- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Automation & Control Theory (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention provides a hybrid electric vehicle engine starting control method, a system and a vehicle, wherein the method comprises the steps that a vehicle control unit determines an engine to be started, a generator is controlled to output torque to drag the engine, and when the engine reaches a starting target rotating speed, an engine controller executes oil injection ignition starting; the generator controller calculates the change of the rotating speed of the generator in real time and records the wave crest and the wave trough of the rotating speed of the generator; in any preset time period, counting the sum of the absolute value of the wave crest of the rotating speed of the generator exceeding a preset peak value and the absolute value of the wave trough of the rotating speed of the generator exceeding the preset peak value; judging whether the frequency is greater than a preset frequency threshold value or not; when the frequency is greater than the preset frequency threshold value, the whole vehicle controller controls the engine to be freely stopped; and the vehicle control unit increases the starting target rotating speed according to the preset step length, and increases the torque according to the starting target rotating speed until the working rotating speed of the engine reaches the starting success mark rotating speed. By the invention, the problem of damage to the engine caused by resonance in starting the engine is solved.
Description
Technical Field
The invention relates to the technical field of hybrid electric vehicles, in particular to a method and a system for controlling the starting of an engine of a hybrid electric vehicle.
Background
In a gasoline-electric hybrid vehicle, a generator shaft is generally connected with the generator shaft through a spline or a transmission gear, so that the starting of an engine and the power generation function of a generator can be realized, wherein a torsional damper or a dual-mass flywheel is generally connected with an output end of the engine and is used for balancing the power output fluctuation of the engine; the output shaft of the engine is provided with a rotating speed sensor, and the rotating speed of the generator can be calculated by the generator through the rotating position. Due to various reasons such as low-temperature long-term standing, engine fire and the like, the resonance rotating speed and the reference resonance rotating speed are possibly deviated, so that resonance occurs in the actual starting process of the engine, and the damaging effect is brought to the quality of an engine shafting and the whole automobile.
Disclosure of Invention
The invention aims to provide a hybrid electric vehicle engine starting control method, a system and a vehicle, which are used for solving the problem of resonance in the actual engine starting process.
The invention provides a hybrid electric vehicle engine starting control method, which comprises the following steps:
the vehicle control unit determines an engine to be started, issues a torque and a starting target rotating speed to the generator controller, and simultaneously sends a starting instruction to the engine controller;
the generator controller controls a generator to output the torque to drag the engine, and when the engine reaches the starting target rotating speed, the engine controller executes oil injection ignition starting;
the generator controller calculates the change of the rotating speed of the generator in real time and records the wave crest and the wave trough of the rotating speed of the generator;
counting a first time when the absolute value of the wave crest of the rotating speed of the generator exceeds a preset peak value and counting a second time when the absolute value of the wave trough of the rotating speed of the generator exceeds the preset peak value within any preset time period;
judging whether the sum of the first times and the second times is greater than a preset time threshold value;
when the sum of the first times and the second times is larger than a preset time threshold value, the vehicle control unit controls an engine controller to stop an oil injection ignition instruction, and issues a drag torque for cancelling a generator to the generator controller, so that the engine is freely stopped;
and the vehicle control unit increases the starting target rotating speed according to a preset step length, increases the torque according to the starting target rotating speed, and circularly executes the starting control method of the hybrid electric vehicle until the working rotating speed of the engine reaches a starting success mark rotating speed, wherein the starting success mark rotating speed is greater than the starting target rotating speed.
Further, the method further comprises:
and when the sum of the first times and the second times is less than or equal to a preset time threshold value in all preset time periods, until the working rotating speed of the engine reaches the starting success mark rotating speed.
Further, the method further comprises:
and when the working rotating speed of the engine reaches the starting success mark rotating speed, the engine controller feeds back the completion of starting to the vehicle control unit.
Further, the step that the vehicle control unit increases the starting target rotating speed according to a preset step length, and before increasing the torque according to the starting target rotating speed, the method further comprises the following steps:
acquiring an ambient temperature;
and generating the preset step length according to the environment temperature, wherein the preset step length is gradually reduced along with the increase of the environment temperature.
The invention provides a hybrid electric vehicle engine starting control system, which comprises:
the starting control unit is used for determining an engine to be started by the vehicle control unit, issuing torque and starting target rotating speed to the generator controller and sending a starting instruction to the engine controller;
the starting execution unit is used for controlling the generator controller to output the torque to drag the engine, and when the engine reaches the starting target rotating speed, the engine controller executes oil injection ignition starting;
the calculation unit is used for calculating the change of the rotating speed of the generator in real time by the generator controller and recording the wave crest and the wave trough of the generator;
the counting unit is used for counting the first times that the absolute value of the wave crest of the rotating speed of the generator exceeds a preset peak value and counting the second times that the absolute value of the wave trough of the rotating speed of the generator exceeds the preset peak value within any preset time period;
the judging unit is used for judging whether the sum of the first times and the second times is greater than a preset time threshold value or not;
the shutdown unit is used for controlling the engine controller to stop an oil injection ignition instruction and issue a drag torque for cancelling the generator to the generator so as to enable the engine to be freely shut down when the sum of the first number and the second number is greater than a preset number threshold value within any preset time period;
the first correction unit is used for increasing the starting target rotating speed according to a preset step length by the vehicle control unit, increasing the torque according to the starting target rotating speed, and circularly calling the starting control unit, the starting execution unit, the calculation unit, the statistic unit, the judgment unit, the shutdown unit and the first correction unit until the working rotating speed of the engine reaches a starting success mark rotating speed, wherein the starting success mark rotating speed is greater than the starting target rotating speed.
Further, when the judging unit judges that the sum of the first times and the second times is less than or equal to a preset time threshold in all preset time periods;
and the starting execution unit is also used for controlling the working rotating speed of the engine to reach the starting success mark rotating speed.
Further, the system further comprises:
and the feedback unit is used for feeding back the completion of starting to the vehicle control unit by the engine controller when the working rotating speed of the engine reaches the starting success mark rotating speed.
Further, the system further comprises:
the testing unit is used for acquiring the ambient temperature;
and the second correction unit is used for generating the preset step length according to the environment temperature, and the preset step length is gradually reduced along with the increase of the environment temperature.
The invention provides an automobile which comprises the engine starting control system of the hybrid electric vehicle.
The implementation of the invention has the following beneficial effects:
according to the invention, the vehicle control unit determines that an engine needs to be started, transmits torque to the generator controller, pulls the engine to rotate when the generator rotates, when the rotating speed of the engine is pulled to a starting target rotating speed, the engine controller controls oil injection and ignition, before the rotating speed of the engine does not reach a starting success mark rotating speed, peaks and troughs of the rotating speed of the generator in a preset time period are taken, and whether the large amplitude vibration occurs when the rotating speed exceeds a preset frequency threshold value is counted; once the large amplitude vibration exceeding the preset frequency threshold value is judged, the system is resonant, the engine is stopped, the starting target rotating speed of the engine is increased, and then the engine is restarted, so that the problem that the engine is damaged due to the resonance in the starting process of the engine is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a hardware relationship diagram of an engine start control method for a hybrid vehicle according to an embodiment of the present invention.
Fig. 2 is a flowchart of an engine start control method for a hybrid vehicle according to an embodiment of the present invention.
Fig. 3 is a graph of the relationship between the generator and the rotation speed according to the embodiment of the invention.
Fig. 4 is a starting target rotation speed adjustment relation graph provided by the embodiment of the invention.
Fig. 5 is a block diagram of an engine start control system of a hybrid vehicle according to an embodiment of the present invention.
Detailed Description
In this patent, when the engine is started, it is determined that the system resonates, and the engine is restarted by increasing the target engine starting speed after the engine is stopped, and the specific embodiment is further described below with reference to the drawings and the embodiments.
As shown in fig. 1, an embodiment of the present invention provides a hardware structure suitable for an engine start control method of a hybrid electric vehicle, where the hardware structure includes a generator 1, a generator controller 2, a vehicle controller 3, an engine controller 4, an engine 5, a crankshaft rotation speed and position sensor 6, a torsional damper or dual mass flywheel 7, and a generator rotation speed and rotation position sensor 8; the output shaft of the engine 5 is connected with the input shaft of the generator 1 through a torsional damper or a dual-mass flywheel 7; the rotating speed of the generator 1 is detected by a generator controller 2 through a generator rotating speed and rotating position sensor 8; the rotation speed of the engine 5 is detected by the engine controller 4 through a crankshaft rotation speed and position sensor 6; the generator controller 2 and the engine controller 4 are connected with the vehicle control unit 3 through CAN communication, so that interaction of internal signals is realized, wherein target rotating speeds and torques of the engine 5 and the generator 1 are determined by the vehicle control unit 3, and the rotating speeds of the engine 5 and the generator 1 are respectively sent to the vehicle control unit 3 by the engine controller 4 and the generator controller 2.
As shown in fig. 2, an embodiment of the present invention provides a hybrid vehicle engine start control method, including:
and step S11, the vehicle control unit determines that the engine needs to be started, issues torque and starting target rotating speed to the generator controller, and simultaneously sends a starting instruction to the engine controller.
The vehicle control unit determines that the engine to be started may receive an engine starting instruction, or the vehicle control unit determines that the engine starting condition is met; the starting target rotation speed in this embodiment refers to a starting target rotation speed to be reached by the engine.
And step S12, the generator controller controls the generator to output the torque to drag the engine, and when the engine reaches the starting target rotating speed, the engine controller executes oil injection ignition starting.
It should be noted that the start target rotational speed is a critical point at which the engine controller executes the fuel injection ignition.
And step S13, the generator controller calculates the change of the rotating speed of the generator in real time and records the wave crest and the wave trough of the rotating speed of the generator.
Referring specifically to fig. 3, zero rotational speed is taken as a dividing point, a high point above the dividing point is a rotational speed peak, a high point below the dividing point is a rotational speed valley, and a peak and a valley are provided in each period.
And step S14, in any preset time period, counting the first times that the absolute value of the wave crest of the rotating speed of the generator exceeds a preset peak value, and counting the second times that the absolute value of the wave trough of the rotating speed of the generator exceeds the preset peak value.
Referring to fig. 3, Δ T shown in the figure represents a preset time period whose start and end points are not fixed, only the length is fixed; in any preset time, the number of times that the absolute value of the wave crest of the generator rotating speed exceeds N2 is a first number, the number of times that the absolute value of the wave trough of the generator rotating speed exceeds N2 is a second number, and when the sum of the first number and the second number is greater than a preset number threshold, the system is judged to have a resonance phenomenon.
And step S15, judging whether the sum of the first times and the second times is greater than a preset time threshold value.
And step S16, when the sum of the first times and the second times is larger than a preset time threshold value, the vehicle control unit controls the engine controller to stop injecting and igniting instructions, and issues a dragging torque for canceling the generator to the generator controller, so that the engine is freely stopped.
When the system has a resonance phenomenon, the vehicle control unit controls the engine controller to stop an oil injection ignition instruction, and the vehicle control unit issues a drag torque for canceling the generator to the generator controller, so that the engine loses internal power and external power and is free to stop.
And step S17, the vehicle control unit increases the starting target rotating speed according to a preset step length, increases the torque according to the starting target rotating speed, and circularly executes the steps S11 to S17 until the working rotating speed of the engine reaches a starting success mark rotating speed, wherein the starting success mark rotating speed is greater than the starting target rotating speed.
It should be noted that, the starting target rotating speed is increased according to the preset step length, and the torque is increased according to the starting target rotating speed, and one possibility is that the working rotating speed of the engine reaches the starting success mark rotating speed, and the engine is started successfully; another possibility is that the system generates resonance phenomenon during the starting process of the engine, the starting target rotating speed is further increased according to the preset step length after the engine is stopped freely, and then the starting action is carried out again until the working rotating speed of the engine reaches the starting success mark rotating speed.
Further, the method further comprises:
and when the sum of the first times and the second times is less than or equal to a preset time threshold value in all preset time periods, until the working rotating speed of the engine reaches the starting success mark rotating speed.
It should be noted that, the sum of the first number and the second number is less than or equal to the preset number threshold, which means that the system has no resonance until the operating speed of the engine reaches the starting success flag speed.
Further, the method further comprises:
and when the working rotating speed of the engine reaches the starting success mark rotating speed, the engine controller feeds back the completion of starting to the vehicle control unit.
Further, step S17 is preceded by:
acquiring an ambient temperature;
and generating the preset step length according to the environment temperature, wherein the preset step length is gradually reduced along with the increase of the environment temperature.
Referring to fig. 4, a vertical axis represents a starting target rotation speed, a horizontal axis represents an ambient temperature, a solid line represents an original starting target rotation speed, a dotted line represents a corrected starting target rotation speed, a difference between the corrected starting target rotation speed and the original starting target rotation speed is a preset step, and the preset step is gradually decreased as the ambient temperature increases; it is also explained that the probability of occurrence of the system resonance phenomenon is small when the ambient temperature is high, and the amplitude of adjusting the starting target rotational speed is small when the resonance phenomenon occurs.
As shown in fig. 5, an embodiment of the present invention provides an engine start control system for a hybrid vehicle, the system including:
the starting control unit 51 is used for determining that the engine needs to be started by the vehicle control unit, issuing torque and starting target rotating speed to the generator controller and sending a starting instruction to the engine controller;
a start execution unit 52 for the generator controller to control the generator to output the torque to drag the engine, the engine controller executing an oil-injection ignition start when the engine reaches the start target rotation speed;
the calculating unit 53 is used for calculating the change of the rotating speed of the generator in real time by the generator controller and recording the wave crest and the wave trough of the generator;
the counting unit 54 is configured to count a first number of times that an absolute value of a peak of the generator rotation speed exceeds a preset peak value, and count a second number of times that an absolute value of a trough of the generator rotation speed exceeds the preset peak value within any preset time period;
a determining unit 55, configured to determine whether a sum of the first number and the second number is greater than a preset number threshold;
the shutdown unit 56 is used for controlling the engine controller to stop an oil injection ignition instruction and issue a drag torque for cancelling the generator to the generator control so as to enable the engine to be freely shut down when the sum of the first number and the second number is greater than a preset number threshold value in any preset time period;
the first correcting unit 57 is configured to increase the starting target rotational speed by the vehicle control unit according to a preset step length, increase the torque according to the starting target rotational speed, and cyclically invoke the starting control unit 51, the starting execution unit 52, the calculating unit 53, the counting unit 54, the judging unit 55, the stopping unit 56, and the first correcting unit 57 until the working rotational speed of the engine reaches a starting success flag rotational speed, where the starting success flag rotational speed is greater than the starting target rotational speed.
Further, when the determining unit 55 determines that the sum of the first number of times and the second number of times is less than or equal to a preset number threshold in all preset time periods;
the start execution unit 52 is further configured to control the operating speed of the engine to reach a start success flag speed.
Further, the system comprises:
and the feedback unit is used for feeding back the completion of starting to the vehicle control unit by the engine controller when the working rotating speed of the engine reaches the starting success mark rotating speed.
Further, the system further comprises:
the testing unit is used for acquiring the ambient temperature;
and the second correction unit is used for generating the preset step length according to the environment temperature, and the preset step length is gradually reduced along with the increase of the environment temperature.
The embodiment of the invention provides an automobile comprising the engine starting control system of the hybrid electric vehicle.
The implementation of the invention has the following beneficial effects:
according to the invention, the vehicle control unit determines that an engine needs to be started, transmits torque to the generator controller, pulls the engine to rotate when the generator rotates, when the rotating speed of the engine is pulled to a starting target rotating speed, the engine controller controls oil injection and ignition, before the rotating speed of the engine does not reach a starting success mark rotating speed, peaks and troughs of the rotating speed of the generator in a preset time period are taken, and whether the large amplitude vibration occurs when the rotating speed exceeds a preset frequency threshold value is counted; once the large amplitude vibration exceeding the preset frequency threshold value is judged, the system is resonant, the engine is stopped, the starting target rotating speed of the engine is increased, and then the engine is restarted, so that the problem that the engine is damaged due to the resonance in the starting process of the engine is solved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. An engine start control method for a hybrid vehicle, the method comprising:
step S11, the vehicle control unit determines that an engine needs to be started, issues a torque and a starting target rotating speed to the generator controller, and simultaneously sends a starting instruction to the engine controller;
step S12, the generator controller controls the generator to output the torque to drag the engine, and when the engine reaches the starting target speed, the engine controller executes oil injection ignition starting;
step S13, the generator controller calculates the change of the rotating speed of the generator in real time and records the wave crest and the wave trough of the rotating speed of the generator;
step S14, in any preset time period, counting a first time when the absolute value of the wave crest of the rotating speed of the generator exceeds a preset peak value, and counting a second time when the absolute value of the wave trough of the rotating speed of the generator exceeds the preset peak value;
step S15, judging whether the sum of the first times and the second times is larger than a preset times threshold value;
step S16, when the sum of the first times and the second times is larger than a preset time threshold value, the vehicle control unit controls an engine controller to stop an oil injection ignition instruction, and issues a drag torque for canceling a generator to the generator controller so that the engine is freely stopped;
and step S17, the vehicle control unit increases the starting target rotating speed according to a preset step length, increases the torque according to the starting target rotating speed, and circularly executes the steps S11 to S17 until the working rotating speed of the engine reaches a starting success mark rotating speed, wherein the starting success mark rotating speed is greater than the starting target rotating speed.
2. The method of claim 1, wherein the method further comprises:
and when the sum of the first times and the second times is less than or equal to a preset time threshold value in all preset time periods, until the working rotating speed of the engine reaches the starting success mark rotating speed.
3. The method of claim 2, wherein the method further comprises:
and when the working rotating speed of the engine reaches the starting success mark rotating speed, the engine controller feeds back the completion of starting to the vehicle control unit.
4. The method of claim 1, wherein the step S17 is preceded by:
acquiring an ambient temperature;
and generating the preset step length according to the environment temperature, wherein the preset step length is gradually reduced along with the increase of the environment temperature.
5. A hybrid vehicle engine start control system, the system comprising:
the starting control unit is used for determining an engine to be started by the vehicle control unit, issuing torque and starting target rotating speed to the generator controller and sending a starting instruction to the engine controller;
the starting execution unit is used for controlling the generator controller to output the torque to drag the engine, and when the engine reaches the starting target rotating speed, the engine controller executes oil injection ignition starting;
the calculation unit is used for calculating the change of the rotating speed of the generator in real time by the generator controller and recording the wave crest and the wave trough of the generator;
the counting unit is used for counting the first times that the absolute value of the wave crest of the rotating speed of the generator exceeds a preset peak value and counting the second times that the absolute value of the wave trough of the rotating speed of the generator exceeds the preset peak value within any preset time period;
the judging unit is used for judging whether the sum of the first times and the second times is greater than a preset time threshold value or not;
the shutdown unit is used for controlling the engine controller to stop an oil injection ignition instruction and issue a drag torque for cancelling the generator to the generator so as to enable the engine to be freely shut down when the sum of the first number and the second number is greater than a preset number threshold value within any preset time period;
the first correction unit is used for increasing the starting target rotating speed according to a preset step length by the vehicle control unit, increasing the torque according to the starting target rotating speed, and circularly calling the starting control unit, the starting execution unit, the calculation unit, the statistic unit, the judgment unit, the shutdown unit and the first correction unit until the working rotating speed of the engine reaches a starting success mark rotating speed, wherein the starting success mark rotating speed is greater than the starting target rotating speed.
6. The engine start control system of a hybrid vehicle according to claim 5, wherein when the judging unit judges that the sum of the first number of times and the second number of times is less than or equal to a preset number threshold for all preset time periods;
and the starting execution unit is also used for controlling the working rotating speed of the engine to reach the starting success mark rotating speed.
7. The hybrid vehicle engine start control system as set forth in claim 6, further comprising:
and the feedback unit is used for feeding back the completion of starting to the vehicle control unit by the engine controller when the working rotating speed of the engine reaches the starting success mark rotating speed.
8. The hybrid vehicle engine start control system as set forth in claim 5, further comprising:
the testing unit is used for acquiring the ambient temperature;
and the second correction unit is used for generating the preset step length according to the environment temperature, and the preset step length is gradually reduced along with the increase of the environment temperature.
9. An automobile characterized by comprising the hybrid automobile engine start control system according to claims 5 to 8.
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| CN201911234699.7A CN112918462B (en) | 2019-12-05 | 2019-12-05 | Hybrid electric vehicle engine starting control method and system and vehicle |
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| CN201911234699.7A CN112918462B (en) | 2019-12-05 | 2019-12-05 | Hybrid electric vehicle engine starting control method and system and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115370499A (en) * | 2022-09-29 | 2022-11-22 | 重庆长安汽车股份有限公司 | Hybrid electric vehicle engine starting control method and system, electronic equipment and vehicle |
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| CN115370499B (en) * | 2022-09-29 | 2023-09-01 | 重庆长安汽车股份有限公司 | Method and system for controlling starting of engine of hybrid electric vehicle, electronic equipment and vehicle |
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| CN112918462B (en) | 2022-04-29 |
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