CN111086499A - Hybrid electric vehicle, control method, computer device and readable storage medium - Google Patents

Hybrid electric vehicle, control method, computer device and readable storage medium Download PDF

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Publication number
CN111086499A
CN111086499A CN201910940475.1A CN201910940475A CN111086499A CN 111086499 A CN111086499 A CN 111086499A CN 201910940475 A CN201910940475 A CN 201910940475A CN 111086499 A CN111086499 A CN 111086499A
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speed
drive system
combustion engine
internal combustion
current
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CN111086499B (en
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谭川鄂
吴国军
李维平
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Suzhou Eagle Electric Vehicle Manufacturing Co Ltd
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Suzhou Eagle Electric Vehicle Manufacturing Co Ltd
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Priority to PCT/CN2019/119694 priority patent/WO2021062929A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
    • 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
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • B60W40/105—Speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a gasoline-electric hybrid electric vehicle, a control method, computer equipment and a readable storage medium, wherein the specific control method comprises the following steps: in the process that the electric drive system works independently, the speed of the automobile or the rotating speed of a motor of the electric drive system is detected, the current state information of the automobile can be obtained, the target rotating speed required to be output by the internal combustion engine is determined according to the current state information, the internal combustion engine is enabled to operate at the moment but not to be jointed with the reduction gearbox, the idle rotating speed of the internal combustion engine is increased to reach the target rotating speed and then is jointed with the reduction gearbox, the problem that the internal combustion engine cannot be jointed due to the fact that the output rotating speed of the internal combustion engine is relatively close to the input rotating speed of the reduction gearbox does not exist, the reduction gearbox cannot be damaged, the process that the electric drive system is transited to the oil drive system or the oil-electric hybrid system is achieved, the driving mode can be flexibly switched in.

Description

Hybrid electric vehicle, control method, computer device and readable storage medium
Technical Field
The invention relates to the field of automobiles, in particular to a gasoline-electric hybrid electric vehicle, a control method, computer equipment and a readable storage medium.
Background
The oil-electric hybrid vehicle comprises an oil drive system and an electric drive system, and a plurality of drive modes exist, including that the oil-electric hybrid vehicle is driven by a plurality of drive systems together or driven by any one drive system independently. In the process of switching a driving system, for example, when the electric driving system is switched to the oil driving system, because the automobile runs at the moment, a certain speed exists, the oil driving system cannot start from a first gear, if an internal combustion engine of the oil driving system is directly combined with a reduction gearbox of the oil driving system, the speed cannot be matched, and the reduction gearbox is damaged, so that when the electric driving system works, the oil driving system cannot be directly switched to work or oil-electricity hybrid driving, and further, in the process of running of the electric driving system, the characteristics of the oil driving system and the electric driving system cannot be fully utilized to carry out flexible conversion.
Disclosure of Invention
To solve the problems in the prior art, an object of the present invention is to provide a hybrid electric vehicle, a control method, a computer device, and a readable storage medium.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for controlling a hybrid electric vehicle, which includes, when an oil drive system is started during independent operation of an electric drive system, the steps of:
detecting a current first speed of the automobile;
calculating a target rotating speed required to be output by the internal combustion engine of the oil drive system according to the current first speed;
starting the oil drive system and detecting the idle speed of the internal combustion engine;
when the idle speed reaches the target speed, an electronic clutch is activated to engage the internal combustion engine with a gearbox of the oil drive system.
As a further improvement of an embodiment of the present invention, the method further comprises the steps of: the power of the electric drive system is reduced after the internal combustion engine is engaged with the transmission.
As a further improvement of an embodiment of the present invention, the step of reducing the power of the electric drive system after the internal combustion engine is engaged with the transmission further comprises:
the internal combustion engine is engaged with the transmission;
detecting a current second speed of the automobile;
when the set vehicle speed is not changed, adjusting the power of the electric drive system until the electric drive system is turned off or the current second speed is equal to the current first speed.
As a further improvement of an embodiment of the present invention, the step of reducing the power of the electric drive system after the internal combustion engine is engaged with the transmission further comprises:
the internal combustion engine is engaged with the transmission;
detecting a current second speed of the automobile;
and when the set vehicle speed is not changed, adjusting the power of the electric drive system, adjusting the power of the oil drive system and adjusting the reduction ratio of the oil drive system until the current second speed is equal to the current first speed.
As a further improvement of an embodiment of the present invention, the step of "detecting a current first speed of the automobile and calculating a target rotation speed that the internal combustion engine of the oil drive system is required to output based on the current first speed" further includes:
detecting the current motor rotating speed of a motor of the electric drive system, and converting the current vehicle speed according to the current motor rotating speed, wherein the current vehicle speed is the current first speed;
adjusting the reduction ratio of the oil drive system according to the current first speed;
setting a target rotating speed interval which is required to be output by an internal combustion engine of the oil drive system according to the reduction ratio of the oil drive system;
any value of the target rotation speed interval may be set as the target rotation speed.
As a further improvement of an embodiment of the present invention, the step of "activating an electronic clutch to engage the internal combustion engine with a transmission of the oil drive system when the idle rotation speed reaches the target rotation speed" further includes:
calculating a preset minimum rotating speed of the motor according to a second preset formula according to the minimum value of the target rotating speed interval;
when the idle speed reaches the target speed, reducing the power of the electric drive system, and detecting the real-time motor speed of the motor;
when the real-time motor rotating speed is greater than or equal to the preset lowest rotating speed, starting an electronic clutch to enable the internal combustion engine to be connected with a gearbox of the oil drive system;
the second preset formula is as follows:
N3＝N4G1/G2
wherein N is3For a predetermined minimum speed of the motor, N4Is the minimum value of the target rotation speed interval, G1Is the reduction ratio of the electric drive system, G2Is the reduction ratio of the oil drive system.
As a further improvement of an embodiment of the present invention, the step of "detecting a current first speed of the automobile and calculating a target rotation speed that the internal combustion engine of the oil drive system is required to output based on the current first speed" further includes: detecting a current motor speed of a motor of the electric drive system, the current motor speed being the current first speed;
calculating a target rotating speed required to be output by an internal combustion engine of the oil drive system according to a first preset formula;
the first preset formula is
N2＝N1G2/G1
Wherein N is1For the current motor speed, N2Is the target rotational speed, G1Is the reduction ratio of the electric drive system, G2Is the reduction ratio of the oil drive system.
In order to achieve one of the above objects, an embodiment of the present invention provides a hybrid electric vehicle, including an oil drive system and an electric drive system, where the oil drive system includes an internal combustion engine and a transmission, and the vehicle further includes:
the electronic clutch controls the internal combustion engine to be connected with or disconnected from the gearbox;
a speed detection unit that detects a rotational speed of a motor of the electric drive system or detects a vehicle speed of the vehicle;
an internal combustion engine speed detection unit that detects an internal combustion engine speed of the oil drive system;
the whole vehicle control system sets the speed detected by the speed detection part as a current first speed, calculates a target rotating speed required to be output by an internal combustion engine of the oil drive system according to the current first speed, controls the internal combustion engine to start, compares the idle rotating speed of the internal combustion engine with the target rotating speed, and controls the electronic clutch to connect the internal combustion engine with the gearbox when the idle rotating speed reaches the target rotating speed.
In order to achieve one of the above objects, an embodiment of the present invention provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps in the control method of the hybrid electric vehicle.
In order to achieve one of the above objects, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, can implement the steps in the control method of the hybrid electric vehicle.
Compared with the prior art, the invention has the following beneficial effects: in the process that the electric drive system works independently, the speed of the automobile or the rotating speed of a motor of the electric drive system is detected, the current state information of the automobile can be obtained, the target rotating speed required to be output by the internal combustion engine is determined according to the current state information, the internal combustion engine is enabled to operate at the moment but not to be jointed with the reduction gearbox, the idle rotating speed of the internal combustion engine is increased to reach the target rotating speed and then is jointed with the reduction gearbox, the problem that the internal combustion engine cannot be jointed due to the fact that the output rotating speed of the internal combustion engine is relatively close to the input rotating speed of the reduction gearbox does not exist, the reduction gearbox cannot be damaged, the process that the electric drive system is transited to the oil drive system or the oil-electric hybrid system is achieved, the driving mode can be flexibly switched in.
Drawings
Fig. 1 is a flowchart of a control method of a hybrid electric vehicle according to an embodiment of the present invention;
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
An embodiment of the invention provides a control method of a hybrid electric vehicle, which is used for controlling the vehicle to flexibly and conveniently switch driving modes during driving, in particular to switch from electric driving system independent driving to oil driving system independent driving or oil-electric hybrid driving.
When the oil drive system is started in the process of independent work of the electric drive system, the method comprises the following steps:
detecting a current first speed of the automobile;
calculating a target rotating speed required to be output by the internal combustion engine of the oil drive system according to the current first speed;
starting the oil drive system and detecting the idle speed of the internal combustion engine;
when the idle speed reaches the target speed, an electronic clutch is activated to engage the internal combustion engine with a gearbox of the oil drive system.
The current first speed can be the current speed of a vehicle, and also can be the rotating speed of a motor of an electric drive system, and when the electric drive system and/or an oil drive work, the rotating speed of the motor or an internal combustion engine has a corresponding relation with the current speed of the vehicle, and can be converted with each other, and the corresponding relation is as follows:
Figure BDA0002222718740000051
wherein N is the rotation speed of the driving system in operation, v is the vehicle speed, φ is the tire diameter of the vehicle, and G is the reduction ratio of the driving system corresponding to the rotation speed.
When the corresponding motor works alone, if the electric drive system does not comprise a speed reducer, the value of the reduction ratio G is 1, so that the steps of the scheme can be realized by detecting the speed of the vehicle or the rotating speed of the motor.
When the oil drive system is started, the internal combustion engine of the oil drive system is not directly jointed with the gearbox, at the moment, an engine throttle valve value is increased, the idle speed of the internal combustion engine is detected, and the electronic clutch is started again to joint the internal combustion engine with the gearbox of the oil drive system until the target speed is reached.
In the process that the electric drive system works independently, the speed of the automobile or the rotating speed of a motor of the electric drive system is detected, the current state information of the automobile can be obtained, the target rotating speed required to be output by the internal combustion engine is determined according to the current state information, the internal combustion engine is enabled to operate at the moment but not to be jointed with the reduction gearbox, the idle rotating speed of the internal combustion engine is increased to reach the target rotating speed and then is jointed with the reduction gearbox, the problem that the internal combustion engine cannot be jointed due to the fact that the output rotating speed of the internal combustion engine is relatively close to the input rotating speed of the reduction gearbox does not exist, the reduction gearbox cannot be damaged, the process that the electric drive system is transited to the oil drive system or the oil-electric hybrid system is achieved, the driving mode can be flexibly switched in.
In the step of calculating the target rotating speed required to be output by the internal combustion engine of the oil drive system according to the current first speed, the invention provides two calculation modes of embodiment 1 and embodiment 2.
Example 1
In this embodiment, the step of "detecting a current first speed of the vehicle and calculating a target rotation speed that the internal combustion engine of the oil drive system needs to output based on the current first speed" further includes: detecting a current motor speed of a motor of the electric drive system, the current motor speed being the current first speed;
calculating a target rotating speed required to be output by an internal combustion engine of the oil drive system according to a first preset formula;
the first preset formula is
N2＝N1G2/G1
Wherein N is1For the current motor speed, N2Is the target rotational speed, G1Is the reduction ratio of the electric drive system, G2Is the reduction ratio of the oil drive system.
It is based on the principle that when an electric drive system is operating, there is a correspondence between the electric motor and the speed of the vehicle
Figure BDA0002222718740000071
Wherein N is5Is the rotational speed of the motor, v is the vehicle speed, phi is the tire diameter of the vehicle, G1Is the reduction ratio of the electric drive system.
When the oil drive system works, the corresponding relation between the motor and the vehicle speed exists
Figure BDA0002222718740000072
Wherein N is6Is the rotational speed of the internal combustion engine, v is the vehicle speed, phi is the tire diameter of the vehicle, G2Is the reduction ratio of the electric drive system.
For the same speed, because the diameter of the automobile tire is unchanged, the two formulas are compared to obtain a first preset formula, the rotating speed required by the internal combustion engine of the oil drive system can be obtained according to the current rotating speed of the motor, if only the oil drive system has a speed reducer, the output of the motor is directly output to the automobile without passing through the speed reducer, G2The value of (b) is 1.
In this embodiment, the detected current first speed is the current motor speed of the motor, and according to the above description, the current first speed may be converted into the motor speed after the vehicle speed is detected, and then the above steps are performed to confirm the target speed.
If it is detectedThe first speed of (2) is the speed of the vehicle, and may be based on the speed of the motor instead of being converted into the rotational speed of the motor
Figure BDA0002222718740000073
Where v is the current first speed, G2And calculating N as the target rotating speed required to be output by the internal combustion engine for the reduction ratio of the oil drive system.
Example 2
In this embodiment, the step of "detecting a current first speed of the vehicle and calculating a target rotation speed that the internal combustion engine of the oil drive system needs to output based on the current first speed" further includes:
detecting the current motor rotating speed of a motor of the electric drive system, and converting the current vehicle speed according to the current motor rotating speed, wherein the current vehicle speed is the current first speed;
adjusting the reduction ratio of the oil drive system according to the current first speed;
setting a target rotating speed interval which is required to be output by an internal combustion engine of the oil drive system according to the reduction ratio of the oil drive system;
any value of the target rotation speed interval may be set as the target rotation speed.
In this embodiment, the detected current first speed is the current speed of the vehicle, and according to the above description, the current speed may be converted into the current speed after the current motor speed of the motor is detected, and then the above steps are performed to determine the target speed.
For example, when the gear of the speed reducer is in the 2 nd gear, the rotating speed of the internal combustion engine can be rotated to 2000 revolutions at 1000, the vehicle speed of the vehicle is more suitable from 10km/h to 20km/h, when the gear of the speed reducer is in the 4 th gear, the rotating speed of the internal combustion engine can be rotated to 3500 revolutions at 2500, the vehicle speed of the vehicle is more suitable from 40km/h to 80km/h, if the speed of the vehicle is detected to be in the 15km/h, the gear of the speed reducer is set to be in the 2 nd gear, a target rotating speed interval is set to be 1000 revolutions to 2000 revolutions, if the speed of the vehicle is detected to be in the 60km/h, the gear of the speed reducer is set to be in the 4 th gear, and the target rotating speed interval is set to be 2500 revolutions to 3500 revolutions.
In the specific setting, the gear can be divided into more gears, the adjustment range of the reduction ratio is more, so that the range of the target rotating speed interval is set to be smaller, for example, the gear is divided into the adjustment ranges of 20 reduction ratios, the target rotating speed interval corresponding to each reduction ratio is also very small, and thus, when the speed reducer and the internal combustion engine are connected in the range of the target rotating speed interval, the difference of the relative rotating speeds of the speed reducer and the internal combustion engine is reduced as much as possible, so that the reduction gearbox is protected, and the performance of the switching driving system is improved.
The target rotating speed obtained in the embodiment is an interval range, the gear required by the oil drive system and the rotating speed of the internal combustion engine required in the gear are determined according to the current running speed of the automobile, and the specific value of the target rotating speed is not as accurate as that in embodiment 1, but the range is large and easy to achieve.
In addition, a driver usually wants to switch the driving mode of the automobile on the premise that the automobile runs stably all the time, and does not want to influence the driving experience because the automobile speed changes suddenly due to the switching of the driving mode of the automobile, and the sudden change of the speed generates a potential safety hazard, so the automobile speed needs to be controlled in the process of switching the driving mode of the automobile. In the process of switching the driving mode, due to the fact that the oil drive system is added suddenly, the power of the whole vehicle is increased, the vehicle speed is increased, and the change of the vehicle speed is adjusted.
Example 3
Further, the method also comprises the following steps: the power of the electric drive system is reduced after the internal combustion engine is engaged with the transmission.
Still further, the step of reducing the power of the electric drive system after the internal combustion engine is engaged with the transmission further comprises:
the internal combustion engine is engaged with the transmission;
detecting a current second speed of the automobile;
when the set vehicle speed is not changed, adjusting the power of the electric drive system until the electric drive system is turned off or the current second speed is equal to the current first speed.
The following performance of the electric drive system is higher than that of the oil drive system. The following performance refers to the time length for the oil drive system or the electric drive system to send a running instruction until the corresponding system reaches the rotating speed corresponding to the running instruction, the shorter the time length is, the higher the following performance is, otherwise, the following performance is low, the following performance of the motor is usually higher than that of the internal combustion engine, namely, after the power of the input current of the motor is changed, the output power is changed quickly, more time length is needed from the change of the oil supply quantity of the internal combustion engine to the change of the output torque, after the power of the oil drive system is determined, in order to enable the speed change of a vehicle to be more stable, the speed feedback is adjusted more timely by changing the power of the electric drive system, the speed adjustment is fast, the variation fluctuation range of the speed is small, and the driving experience.
After the internal combustion engine is connected, if the power of the electric motor is not increased, comparing the vehicle speeds before and after adjustment, detecting that the vehicle speed has an ascending trend, at the moment, reducing the power of the electric motor, and reducing the vehicle speed, if the speed of the automobile is reduced too much, increasing the input of the power of the electric motor until the speed is recovered to be the same as the speed before and after adjustment, if the input power of the electric motor is reduced to the minimum value, namely 0, the speed of the automobile is still higher than the speed before adjustment, at the moment, if the rotating speed of the oil drive system is not changed, the electric drive system is adjusted to the limit value, namely, the adjustment is stopped. The detection and adjustment process is rapid and timely due to the good following performance of the motor.
Example 4
In contrast to embodiment 3, the step "reducing the power of the electric drive system after engaging the internal combustion engine with the transmission" further comprises:
the internal combustion engine is engaged with the transmission;
detecting a current second speed of the automobile;
and when the set vehicle speed is not changed, adjusting the power of the electric drive system, adjusting the power of the oil drive system and adjusting the reduction ratio of the oil drive system until the current second speed is equal to the current first speed.
After the oil drive system is connected, in order to cope with the situation that the electric drive system is adjusted to the limit value, the vehicle speed cannot be reduced to the state before adjustment, and when a driver needs oil-electricity hybrid driving, the reduction ratio of the oil drive system can be adjusted and the power of the oil drive system can be adjusted simultaneously, for example, the reduction ratio of the oil drive system is increased, the same input rotating speed is enabled to correspond to a smaller output rotating speed, the power of the oil drive system is reduced, the output rotating speed of the internal combustion engine is reduced, the vehicle speed is adjusted together, and the state needed by the driver is recovered.
Example 5
In embodiments 3 and 4, the power of the electric drive system is adjusted after the oil drive system is added, and there is a process of increasing the vehicle speed and then decreasing, and in order to avoid the increase of the vehicle speed, or in order to prevent the vehicle speed from increasing too much, embodiment 5 is proposed.
At the moment of reducing the power of the motor, the speed of the vehicle does not change, the acceleration of deceleration exists, if the power of the motor is reduced even to 0 at the moment before the internal combustion engine and the speed reducer are jointed, and then the internal combustion engine and the speed reducer are jointed, the switching of the driving mode can be realized, but the problems that the speed change is difficult to control and the speed of the vehicle is unstable still exist in the process.
On the basis of embodiment 2, the step of "activating an electronic clutch to engage the internal combustion engine with a transmission of the oil drive system when the idle rotation speed reaches the target rotation speed" further includes:
calculating a preset minimum rotating speed of the motor according to a second preset formula according to the minimum value of the target rotating speed interval;
when the idle speed reaches the target speed, reducing the power of the electric drive system, and detecting the real-time motor speed of the motor;
when the real-time motor rotating speed is greater than or equal to the preset lowest rotating speed, starting an electronic clutch to enable the internal combustion engine to be connected with a gearbox of the oil drive system;
the second preset formula is as follows:
N3＝N4G1/G2
wherein N is3For a predetermined minimum speed of the motor, N4Is the minimum value of the target rotation speed interval, G1Is the reduction ratio of the electric drive system, G2Is the reduction ratio of the oil drive system.
The lowest value of the target rotation speed interval determined according to embodiment 2, for example, the vehicle speed is 60km/h, the rotation speed of the electric motor is 3500 revolutions and is switched to the 4-gear position, the rotation speed of the internal combustion engine can be 2500 revolutions to 3500 revolutions, the vehicle speed corresponding to 2500 revolutions of the internal combustion engine is 40km/h, the rotation speed of the electric motor is 2000 revolutions, that is, the electric motor can maintain the internal combustion engine to be switched to the 4-gear position when the rotation speed of the electric motor is reduced to any value before 2000 revolutions, for example, the rotation speed of the electric motor is 2100 revolutions, the internal combustion engine and the reduction gearbox are engaged, the power of the internal combustion engine is supplemented on the basis of the reduction of the power of the electric motor, and the vehicle speeds before and after adjustment are recovered to be consistent on the premise of reducing.
The non-specified values of the speed, the gear and the rotating speed can be all according to the reduction ratio G of the electric drive system1Reduction ratio G of said oil drive system2A corresponding adjustment is made.
In addition, the running state of the internal combustion engine is detected in real time, and when the internal combustion engine stops running, if the internal combustion engine is connected with the gearbox, the electronic clutch is controlled to separate the internal combustion engine from the gearbox, so that the phenomenon that when the internal combustion engine stops running, a speed reducer is connected to cause obstruction to running of an automobile, and the speed reducer is damaged is prevented.
And in the process of closing the oil drive system and enabling the electric drive system to work independently, the method comprises the following steps:
activating the electronic clutch to disconnect the internal combustion engine from a transmission;
controlling the internal combustion engine to stop rotating;
increasing the power of the electric drive system.
Further, this embodiment still provides a hybrid vehicle, including oil drive system and electric drive system, oil drive system includes internal-combustion engine and gearbox, the car still includes:
the electronic clutch controls the internal combustion engine to be connected with or disconnected from the gearbox;
a speed detection unit that detects a rotational speed of a motor of the electric drive system or detects a vehicle speed of the vehicle;
an internal combustion engine speed detection unit that detects an internal combustion engine speed of the oil drive system;
the whole vehicle control system sets the speed detected by the speed detection part as a current first speed, calculates a target rotating speed required to be output by an internal combustion engine of the oil drive system according to the current first speed, controls the internal combustion engine to start, compares the idle rotating speed of the internal combustion engine with the target rotating speed, and controls the electronic clutch to connect the internal combustion engine with the gearbox when the idle rotating speed reaches the target rotating speed.
The speed detection part detects the rotating speed of a motor of the electric drive system or detects the speed of the automobile, the speed detection part can be a rotating speed detection part of the motor, the current speed of the automobile can be detected by a positioning device or a method of detecting the rotating speed of a tire and the like, and the rotating speed of the motor and the current speed can be converted according to the formula provided above;
further, the present embodiment also provides a computer device, which includes a memory and a processor, where the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps in the control method for the hybrid electric vehicle.
Further, the present embodiment also provides a computer-readable storage medium, which stores a computer program, and the computer program can implement the steps in the control method of the hybrid electric vehicle when being executed by a processor.
The detailed description set forth above is merely a specific description of possible embodiments of the present invention and is not intended to limit the scope of the invention, which is intended to include within the scope of the invention equivalent embodiments or modifications that do not depart from the technical spirit of the present invention.

Claims (10)

1. A control method of a gasoline-electric hybrid vehicle is characterized in that when an oil drive system is started in the process of independent work of an electric drive system, the method comprises the following steps:
detecting a current first speed of the automobile;
calculating a target rotating speed required to be output by the internal combustion engine of the oil drive system according to the current first speed;
starting the oil drive system and detecting the idle speed of the internal combustion engine;
when the idle speed reaches the target speed, an electronic clutch is activated to engage the internal combustion engine with a gearbox of the oil drive system.
2. The method according to claim 1, wherein the step of "detecting a current first speed of the vehicle, and calculating a target rotation speed that an internal combustion engine of the oil drive system is required to output based on the current first speed" further comprises: detecting a current motor speed of a motor of the electric drive system, the current motor speed being the current first speed;
calculating a target rotating speed required to be output by an internal combustion engine of the oil drive system according to a first preset formula;
the first preset formula is
N2＝N1G2/G1
Wherein N is1For the current motor speed, N2Is the target rotational speed, G1Is the reduction ratio of the electric drive system, G2Is the reduction ratio of the oil drive system.
3. The method according to claim 1, wherein the step of "detecting a current first speed of the vehicle, and calculating a target rotation speed that an internal combustion engine of the oil drive system is required to output based on the current first speed" further comprises:
detecting the current motor rotating speed of a motor of the electric drive system, and converting the current vehicle speed according to the current motor rotating speed, wherein the current vehicle speed is the current first speed;
adjusting the reduction ratio of the oil drive system according to the current first speed;
setting a target rotating speed interval which is required to be output by an internal combustion engine of the oil drive system according to the reduction ratio of the oil drive system;
any value of the target rotation speed interval may be set as the target rotation speed.
4. The control method of a gasoline-electric hybrid vehicle according to claim 3, characterized in that the step of "activating an electronic clutch to engage the internal combustion engine with a transmission of the oil drive system when the idle rotation speed reaches the target rotation speed" further comprises:
calculating a preset minimum rotating speed of the motor according to a second preset formula according to the minimum value of the target rotating speed interval;
when the idle speed reaches the target speed, reducing the power of the electric drive system, and detecting the real-time motor speed of the motor;
when the real-time motor rotating speed is greater than or equal to the preset lowest rotating speed, starting an electronic clutch to enable the internal combustion engine to be connected with a gearbox of the oil drive system;
the second preset formula is as follows:
N3＝N4G1/G2
wherein N is3For a predetermined minimum speed of the motor, N4Is the minimum value of the target rotation speed interval, G1Is the reduction ratio of the electric drive system, G2Is the reduction ratio of the oil drive system.
5. The control method of the hybrid electric vehicle according to claim 1, characterized by further comprising the steps of: the power of the electric drive system is reduced after the internal combustion engine is engaged with the transmission.
6. The method for controlling a hybrid electric vehicle according to claim 5, wherein the step of reducing the power of the electric drive system after the internal combustion engine is engaged with the transmission further comprises:
the internal combustion engine is engaged with the transmission;
detecting a current second speed of the automobile;
when the set vehicle speed is not changed, adjusting the power of the electric drive system until the electric drive system is turned off or the current second speed is equal to the current first speed.
7. The method for controlling a hybrid electric vehicle according to claim 5, wherein the step of reducing the power of the electric drive system after the internal combustion engine is engaged with the transmission further comprises:
the internal combustion engine is engaged with the transmission;
detecting a current second speed of the automobile;
and when the set vehicle speed is not changed, adjusting the power of the electric drive system, adjusting the power of the oil drive system and adjusting the reduction ratio of the oil drive system until the current second speed is equal to the current first speed.
8. A hybrid electric vehicle comprising an oil drive system and an electric drive system, said oil drive system comprising an internal combustion engine and a gearbox, characterized in that said vehicle further comprises:
the electronic clutch controls the internal combustion engine to be connected with or disconnected from the gearbox;
a speed detection unit that detects a rotational speed of a motor of the electric drive system or detects a vehicle speed of the vehicle;
an internal combustion engine speed detection unit that detects an internal combustion engine speed of the oil drive system;
the whole vehicle control system sets the speed detected by the speed detection part as a current first speed, calculates a target rotating speed required to be output by an internal combustion engine of the oil drive system according to the current first speed, controls the internal combustion engine to start, compares the idle rotating speed of the internal combustion engine with the target rotating speed, and controls the electronic clutch to connect the internal combustion engine with the gearbox when the idle rotating speed reaches the target rotating speed.
9. A computer device comprising a memory and a processor, the memory storing a computer program operable on the processor, wherein the processor when executing the computer program implements the steps in the control method of the hybrid electric vehicle according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps in the control method for a hybrid electric vehicle according to any one of claims 1 to 7.
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