CN112896144B - New energy automobile range extender resonance judgment method and system and automobile - Google Patents

New energy automobile range extender resonance judgment method and system and automobile Download PDF

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Publication number
CN112896144B
CN112896144B CN201911226138.2A CN201911226138A CN112896144B CN 112896144 B CN112896144 B CN 112896144B CN 201911226138 A CN201911226138 A CN 201911226138A CN 112896144 B CN112896144 B CN 112896144B
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engine
speed
generator
rotating speed
engine speed
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CN112896144A (en
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朱永明
陈立华
邹海斌
任晓华
苏建云
魏丹
祁宏钟
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0666—Engine torque
    • 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
    • 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

Abstract

The invention provides a resonance judgment method and system for a range extender of a new energy automobile and the automobile, wherein the method comprises the steps that a vehicle control unit determines an engine to be started, issues torque and a starting target rotating speed to a generator controller, and simultaneously sends a starting instruction to the engine controller; the generator controller controls the generator to output torque to drag the engine, and when the engine reaches the starting target rotating speed, the engine controller executes oil injection ignition starting; the vehicle control unit acquires the rotating speed of the engine and the rotating speed of the generator and calculates the speed difference between the rotating speed of the engine and the rotating speed of the generator; comparing the absolute value of the speed difference with a first preset value; when the absolute value of the speed difference is larger than a first preset value, comparing the current engine rotating speed with the engine rotating speed at the optimal working condition point; and adjusting the current engine speed according to the comparison result to enable the current engine speed to be close to the engine speed at the optimal working condition point. The invention solves the problem of resonance phenomenon caused by the same frequency of the engine and the generator.

Description

New energy automobile range extender resonance judgment method and system and automobile
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a method and a system for judging resonance of a range extender and an automobile.
Background
An extended range electric vehicle or a series hybrid has a power generation device consisting of an engine and a generator. In the power generation device, the engine input shaft is generally connected with the generator shaft through a spline, so that the starting of the engine and the power generation function of the generator can be realized. The obtained electric energy can be used for driving the motor to drive the vehicle to run or can be stored in a power battery.
The output end of the engine is generally connected with a torsional damper or a dual-mass flywheel for balancing the power output fluctuation of the engine. However, due to various reasons, such as engine fire, long-term low-temperature standing and the like, the overall torsional rigidity and damping of the range extender are changed, and resonance phenomenon is shown under some working conditions: the vehicle control unit is expected to control the engine to operate at a certain working point according to an economic strategy so as to obtain better fuel economy, but the engine is difficult to stably operate at the working point due to other reasons, and the vehicle control unit controls the torque of the generator to adjust the load of the engine; because a torsional damper or a dual-mass flywheel is generally arranged between an engine and a generator, the rotational inertia of a shafting is generally larger, and the communication control delay of the engine and the generator causes the rotation speeds of the engine and the generator to be difficult to synchronize, once the working point of the engine cannot be relatively stable, a 'resonance phenomenon' of the shafting can be brought, destructive consequences are brought to the NVH (Noise, Vibration and Harshness) quality of a range extender and a whole vehicle, and particularly, the 'resonance phenomenon' is more easily caused when the working rotation speed is close to the natural frequency of the shafting or when the working stroke of the engine and the adjusting torque of the generator are at the same frequency caused by reasons such as engine fire and the like.
Disclosure of Invention
The invention aims to provide a new energy automobile range extender resonance judgment method, a new energy automobile range extender resonance judgment system and an automobile, which are used for detecting whether an engine and a generator resonate in real time and adjusting the system to avoid the resonance when the engine and the generator resonate.
The invention provides a resonance judgment method for a range extender of a new energy automobile, 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 vehicle control unit acquires the rotating speed of an engine and the rotating speed of a generator, and calculates the speed difference between the rotating speed of the engine and the rotating speed of the generator;
comparing the absolute value of the speed difference with a first preset value;
when the absolute value of the speed difference is larger than the first preset value, comparing the current engine speed with the engine speed at the optimal working condition point;
and adjusting the current engine speed according to the comparison result to enable the current engine speed to be close to the engine speed at the optimal working condition point.
Further, the method further comprises:
when the absolute value of the speed difference is smaller than or equal to the first preset value, counting the absolute values of the wave crest and the wave trough of the speed difference;
and when the times that the absolute values of the wave crests and the wave troughs of the speed difference are larger than a second preset value within preset time are larger than preset times, comparing the current engine speed with the engine speed at the optimal working condition point, wherein the first preset value is larger than the second preset value.
Further, the step of acquiring the engine speed and the generator speed by the vehicle control unit specifically includes:
the generator controller and the engine controller respectively report the rotating speed of the generator and the rotating speed of the engine in real time, and the vehicle control unit receives the rotating speed of the generator and the rotating speed of the engine.
Further, the step of adjusting the current engine speed according to the comparison result to make the current engine speed approach the optimal operating point specifically includes:
and when the current engine speed is lower than the engine speed at the optimal working condition point, increasing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
Further, the step of adjusting the current engine speed according to the comparison result to make the current engine speed approach the optimal operating point specifically includes:
and when the current engine speed is greater than the engine speed at the optimal working condition point, reducing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
The invention provides a new energy automobile range extender resonance judgment system, which comprises:
the control unit is used for determining that an 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;
the 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 calculating unit is used for acquiring the rotating speed of the engine and the rotating speed of the generator by the vehicle control unit and calculating the speed difference between the rotating speed of the engine and the rotating speed of the generator;
the first arithmetic unit is used for comparing the absolute value of the speed difference with a first preset value;
the second operation unit is used for comparing the current engine speed with the engine speed at the optimal working condition point when the absolute value of the speed difference is larger than the first preset value;
and the adjusting unit is used for adjusting the current engine rotating speed according to the comparison result so as to enable the current engine rotating speed to be close to the engine rotating speed at the optimal working condition point.
Further, the system further comprises a statistic unit, wherein the statistic unit is used for counting the absolute values of the wave crest and the wave trough of the speed difference when the absolute value of the speed difference is smaller than or equal to the first preset value;
the second operation unit is further configured to compare the current engine speed with the engine speed at the optimal working condition point when the number of times that the absolute values of the peaks and the troughs of the speed difference are greater than a second preset value is greater than a preset number of times within a preset time, where the first preset value is greater than the second preset value.
Further, the adjusting unit is specifically configured to:
and when the current engine speed is lower than the engine speed at the optimal working condition point, increasing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
Further, the adjusting unit is specifically configured to:
and when the current engine speed is greater than the engine speed at the optimal working condition point, reducing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
The automobile comprises the new energy automobile range extender resonance judgment system.
The implementation of the invention has the following beneficial effects:
according to the invention, the rotation speed difference between the engine and the generator is compared with the first preset value and the second preset value, whether resonance occurs is detected in real time, and when the resonance phenomenon is judged to exist, the rotation speed of the engine is adjusted to the direction of the rotation speed of the engine at the optimal working condition point, so that the problem that the resonance phenomenon is caused by the same frequency of the existing engine and the generator is solved, the NVH quality of the whole vehicle is improved, and a range extender shafting and associated components are protected.
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 structure diagram of a resonance determination method for a range extender of a new energy vehicle according to an embodiment of the present invention.
Fig. 2 is a flowchart of a new energy vehicle range extender resonance determination method provided in the embodiment of the present invention.
FIG. 3 is a graph of the difference between the rotational speed of the generator and the rotational speed of the engine provided by an embodiment of the present invention.
FIG. 4 is a graph illustrating engine speed adjustments provided in accordance with an embodiment of the present invention.
Fig. 5 is a structural diagram of a new energy vehicle range extender resonance determination system according to an embodiment of the present invention.
Detailed Description
In this patent, it is determined that the engine and the generator are in resonance, and the engine speed is adjusted to get rid of the resonance.
As shown in fig. 1, an embodiment of the present invention provides a hardware structure suitable for a new energy vehicle range extender resonance determination method, 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 a 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 rotational speed of the engine 5 is detected by the engine controller 4 via the crankshaft rotational 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 resonance determination method for a range extender of a new energy vehicle, where the method includes:
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.
In step S12, the generator controller controls the generator to output the torque to drag the engine, and when the engine reaches the start target rotation speed, the engine controller executes an injection ignition start.
The engine input shaft is typically connected to the generator shaft by a spline, which can perform the engine starting and the generator generating functions.
And step S13, the vehicle control unit acquires the engine speed and the generator speed, and calculates the speed difference between the engine speed and the generator speed.
It should be noted that the method for acquiring the engine speed and the generator speed by the vehicle control unit specifically includes: the generator controller and the engine controller respectively report the rotating speed of the generator and the rotating speed of the engine in real time, and the vehicle control unit receives the rotating speed of the generator and the rotating speed of the engine.
It should be noted that, when step S13 is executed, the engine start is already completed.
It should be noted that a torsional damper or a dual mass flywheel is generally arranged between the engine and the generator, the rotational inertia of the shafting is generally large, and the communication control of the engine and the generator is delayed, so that the rotation speeds of the engine and the generator are difficult to synchronize, and therefore, a speed difference exists between the engine and the generator.
And step S14, comparing the absolute value of the speed difference with a first preset value.
And step S15, when the absolute value of the speed difference is larger than the first preset value, comparing the current engine speed with the engine speed at the optimal working condition point.
And step S16, adjusting the current engine speed according to the comparison result to enable the current engine speed to be close to the engine speed at the optimal working condition point.
It should be noted that the optimal operating point engine speed refers to the rotational speed of the engine at the optimal operating point.
Referring to fig. 3, when the absolute value of the speed difference is greater than the first preset value, in this embodiment, the first preset value is N1, and the current engine speed is compared with the engine speed at the optimal operating point; when the absolute value of the speed difference is smaller than or equal to the first preset value, counting the absolute values of the wave crest and the wave trough of the speed difference; and when the times that the absolute values of the wave crests and the wave troughs of the speed difference are larger than a second preset value N2 are larger than a preset time X times within a preset time delta T, comparing the current engine speed with the engine speed at the optimal working condition point, wherein the first preset value N1 is larger than the second preset value N2.
It should be noted that if the absolute value of the speed difference is greater than N1 or the number of times that the absolute value of the peak and the trough of the speed difference is greater than N2 at the preset time Δ T is greater than the preset number X, it indicates that the shafting resonance phenomenon occurs.
With reference to fig. 4, in step S16, the current engine speed is adjusted according to the comparison result to approach the engine speed at the optimal operating point; the method specifically comprises the following steps: when the current engine speed is lower than the engine speed at the optimal working condition point, increasing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point; case two: and when the current engine speed is greater than the engine speed at the optimal working condition point, reducing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
In the case of the first condition, the vehicle control unit controls the torque of the generator to adjust the load of the engine, and the generator reduces the load torque to increase the rotating speed of the engine; for case two, the engine speed is reduced by increasing the load torque through the generator.
As shown in fig. 5, an embodiment of the present invention provides a new energy vehicle range extender resonance determination system, where the system includes:
the 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;
an execution unit 52 for controlling the generator controller 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 the vehicle control unit to acquire the rotating speed of the engine and the rotating speed of the generator and calculate the speed difference between the rotating speed of the engine and the rotating speed of the generator;
a first arithmetic unit 54 for comparing the absolute value of the speed difference with a first preset value;
a second operation unit 55, configured to compare the current engine speed with the engine speed at the optimal operating point when the absolute value of the speed difference is greater than the first preset value;
and the adjusting unit 56 is used for adjusting the current engine speed according to the comparison result to enable the current engine speed to be close to the engine speed at the optimal working condition point.
Further, the system further comprises a statistical unit, wherein the statistical unit is used for counting the absolute values of the wave crest and the wave trough of the speed difference when the absolute value of the speed difference is smaller than or equal to the first preset value;
the second operation unit 55 is further configured to compare the current engine speed with the engine speed at the optimal working condition point when the number of times that the absolute values of the peak and the trough of the speed difference are greater than a second preset value is greater than a preset number of times within a preset time, where the first preset value is greater than the second preset value.
Further, the adjusting unit 56 is specifically configured to:
and when the current engine speed is lower than the engine speed at the optimal working condition point, increasing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
Further, the adjusting unit 56 is specifically configured to:
and when the current engine speed is greater than the engine speed at the optimal working condition point, reducing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
The embodiment of the invention provides an automobile which comprises the new energy automobile range extender resonance judgment system.
The implementation of the invention has the following beneficial effects:
according to the invention, the rotation speed difference between the engine and the generator is compared with the first preset value and the second preset value, whether resonance occurs is detected in real time, and when the resonance phenomenon is judged to exist, the rotation speed of the engine is adjusted to the direction of the rotation speed of the engine under the optimal working condition, so that the problem of the resonance phenomenon caused by the same frequency of the existing engine and the generator is solved, the resonance phenomenon is reduced to improve the NVH quality of the whole vehicle, and a range extender shafting and associated components are protected.
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 (8)

1. A resonance judgment method for a range extender of a new energy automobile is characterized by comprising the following steps:
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;
s13, the vehicle control unit obtains the rotating speed of the engine and the rotating speed of the generator, and calculates the speed difference between the rotating speed of the engine and the rotating speed of the generator;
step S14, comparing the absolute value of the speed difference with a first preset value;
step S15, when the absolute value of the speed difference is larger than the first preset value, comparing the current engine speed with the engine speed at the optimal working condition point; when the absolute value of the speed difference is smaller than or equal to the first preset value, counting the absolute values of the wave crest and the wave trough of the speed difference; when the times that the absolute values of the wave crests and the wave troughs of the speed difference are larger than a second preset value within preset time are larger than preset times, comparing the current engine rotating speed with the engine rotating speed at the optimal working condition point, wherein the first preset value is larger than the second preset value;
and step S16, adjusting the current engine speed according to the comparison result to enable the current engine speed to be close to the engine speed at the optimal working condition point.
2. The method of claim 1, wherein the step of obtaining the engine speed and the generator speed by the vehicle control unit specifically comprises:
the generator controller and the engine controller respectively report the rotating speed of the generator and the rotating speed of the engine in real time, and the vehicle control unit receives the rotating speed of the generator and the rotating speed of the engine.
3. The method according to claim 1, wherein the step S16 specifically includes:
and when the current engine speed is lower than the engine speed at the optimal working condition point, increasing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
4. The method according to claim 1, wherein the step S16 specifically includes:
when the current engine speed is greater than the engine speed at the optimal working condition point, reducing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
5. The utility model provides a new energy automobile increases journey ware resonance judgement system which characterized in that, the system includes:
the 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 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 calculating unit is used for acquiring the rotating speed of the engine and the rotating speed of the generator by the vehicle control unit and calculating the speed difference between the rotating speed of the engine and the rotating speed of the generator;
the first arithmetic unit is used for comparing the absolute value of the speed difference with a first preset value;
the second operation unit is used for comparing the current engine speed with the engine speed at the optimal working condition point when the absolute value of the speed difference is larger than the first preset value;
the counting unit is used for counting the absolute values of the wave crest and the wave trough of the speed difference when the absolute value of the speed difference is smaller than or equal to the first preset value;
the second operation unit is further configured to compare the current engine speed with the engine speed at the optimal working condition point when the number of times that the absolute values of the peaks and the troughs of the speed difference are greater than a second preset value is greater than a preset number of times within a preset time, where the first preset value is greater than the second preset value;
and the adjusting unit is used for adjusting the current engine rotating speed according to the comparison result so as to enable the current engine rotating speed to be close to the engine rotating speed at the optimal working condition point.
6. The system of claim 5, wherein the adjustment unit is specifically configured to:
and when the current engine speed is lower than the engine speed at the optimal working condition point, increasing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
7. The system of claim 5, wherein the adjustment unit is specifically configured to:
and when the current engine speed is greater than the engine speed at the optimal working condition point, reducing the current engine speed to enable the current engine speed to be close to the engine speed at the optimal working condition point.
8. An automobile, characterized in that the automobile comprises the new energy automobile range extender resonance judgment system according to any one of claims 5 to 7.
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