CN112622694B - Range-extending type electric automobile energy recovery method based on sliding state and power generation intensity - Google Patents
Range-extending type electric automobile energy recovery method based on sliding state and power generation intensity Download PDFInfo
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- CN112622694B CN112622694B CN202110057164.8A CN202110057164A CN112622694B CN 112622694 B CN112622694 B CN 112622694B CN 202110057164 A CN202110057164 A CN 202110057164A CN 112622694 B CN112622694 B CN 112622694B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Mechanical Engineering (AREA)
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- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Hybrid Electric Vehicles (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a stroke-increasing type electric automobile energy recovery method based on a sliding state and power generation intensity, wherein the charging time of a battery is selected and the charging speed of the battery is interfered by a sliding duty ratio Q, a controller monitors the action of an accelerator pedal in real time, when the accelerator pedal is in an initial position and is used as an automobile sliding state, when the controller executes energy recovery action, the kinetic energy of the automobile is immediately recovered, so that wheels drag a motor to generate power, corresponding braking force is generated on the wheels, the kinetic energy of the automobile is recovered, the wheels drag the motor to generate power, and the corresponding braking force is generated on the wheels; the working state of the engine after being started is divided into 2 grades, and the energy recovery process is managed more finely, so that the power of the battery is ensured to be supplemented, the engine outputs smaller power, the intervention frequency and intensity of the engine are further reduced, and the fuel consumption and the exhaust emission are reduced.
Description
Technical Field
The invention belongs to a method for recovering energy of an extended-range electric vehicle based on a sliding state and power generation intensity.
Background
In the prior art, braking energy recovery or engine starting charging mostly only considers the factors such as a battery SOC value and charging efficiency, but does not consider the running condition of the automobile, for example, when the automobile runs on a congested road section or a mountain road, the driving mode and the sliding mode need to be frequently switched; however, when the automobile runs on a smooth and straight road, the frequency of the use of the automobile sliding mode is lower. The frequent sliding process of the automobile is just the best opportunity for energy recovery or battery power supplement, and when the automobile slides, a driver needs to properly control the speed of the automobile to decelerate, and a stronger energy recovery gear is utilized to generate stronger braking force so as to control the speed of the automobile and recover the energy. When the sliding frequency of the automobile is low, the speed fluctuation of the automobile is smaller, and at the moment, a driver pays more attention to the driving smoothness in the sliding process, so that the energy recovery intensity is weaker to prevent the violent change of the speed of the automobile from influencing the driving smoothness.
Disclosure of Invention
In order to overcome the defect that the driving condition of an automobile is not considered in the process of braking energy recovery or engine starting charging in the prior art, the invention provides a range-extended electric automobile energy recovery method based on a sliding state and power generation intensity.
The method utilizes the sliding duty ratio Q as the judgment standard of the sliding frequency, and the judgment standard is defined as the percentage of the time of the automobile in a sliding state per minute; the controller takes minutes as a basic metering time period to calculate the coasting duty ratio of the controller in real time; the controller monitors the action of the accelerator pedal in real time, when the accelerator pedal is in an initial position, the state is determined as an automobile sliding state, the sliding state comprises a process that a driver steps on a brake pedal to brake, and when the automobile is in the sliding state, the controller enables the automobile to enter an energy recovery state, namely, a wheel drives a generator to charge a battery and generate braking force; when the accelerator pedal is not at the initial position, the vehicle is driven by the motor.
In the present invention, in addition to the SOC index, a new reference index, the battery charge rate R, is added, and is defined as the change value (percentage) of the battery SOC per minute, when the battery charge increases, R is a positive value, and when the battery charge decreases, R is a negative value. Through the index, the charging and discharging speed of the battery can be accurately monitored under the temperature in different seasons, and the charging and discharging speed of the battery can be monitored under different automobile running conditions or loads, so that the charging and discharging conditions of the battery can be known in time, the charging opportunity of the battery is selected in advance and the charging speed of the battery is interfered, and the interference is not performed when the SOC in the battery is too low, so that the electric quantity in the battery can be kept in a set reasonable interval, and the running mileage of the electric automobile can be further prolonged.
The intensity of energy recovery is 1 grade, 2 grades and 3 grades from low to high, wherein the recovery intensity of 1 grade is 25% of the maximum energy recovery intensity of the vehicle, the recovery intensity of 2 grade is 50% of the maximum energy recovery intensity of the vehicle, and the recovery intensity of 3 grade is the maximum energy recovery intensity of the vehicle.
After the engine is started, a set gear is used for driving a generator to generate power, the working state of the engine after the engine is started is divided into 2 gears, wherein the 1 gear is an economic mode, and the power output of the engine is 50% of the maximum output power; the 2 nd gear is a performance mode, the power output of the engine is the maximum, but the oil consumption is higher, and the power-supplementing device is suitable for supplementing power to the battery in an emergency.
The control process of the invention comprises the following steps:
s1, starting a controller for energy distribution;
s2, judging the automobile sliding state by the controller;
s3, (1) if the automobile is in a coasting state and the coasting duty ratio Q is less than 20%, determining that the automobile is in a coasting state with low coasting frequency; the controller judges the value of the SOC of the battery by utilizing a battery module for monitoring the voltage and the current of the battery;
1) if the SOC is more than or equal to 60 percent, the residual electric quantity in the battery is sufficient, the battery enters the 1 st gear with the lowest energy recovery intensity, the braking force generated by energy recovery is weakest, the controller detects and judges the electric quantity change rate R of the battery, if the R is more than 0, the electric quantity generated by the energy recovery 1 st gear is enough to supplement electricity to the battery, the energy recovery 1 st gear is kept, and the kinetic energy of the automobile is recovered continuously; if R is less than or equal to 0, the electric quantity generated by the energy recovery 1 gear is not enough to supplement electricity to the battery, and the energy recovery is adjusted to 2 gears so as to generate stronger braking force and recover more energy.
2) If the SOC is less than 30% and less than 60%, the remaining electric quantity in the battery is moderate, an energy recovery 2 gear is entered, the controller detects and judges the change rate R of the electric quantity of the battery, and if the R is greater than 0, the electric quantity generated by the energy recovery 2 gear is enough to supplement the electric energy to the battery, the energy recovery 2 gear is kept, so that the kinetic energy of the automobile is continuously recovered; if R is less than or equal to 0, the electric quantity generated by only the energy recovery 2 gear is not enough to supplement the electricity to the battery, and besides the energy recovery is still in the 2 gear, the engine is started and is set to the 1 gear to drive the generator to generate electricity.
3) If the SOC is less than or equal to 30%, the residual electric quantity in the battery is insufficient, the energy recovery 2 gear is entered, the controller detects and judges the electric quantity change rate R of the battery, if the R is greater than 0, the electric quantity generated by the energy recovery 2 gear is enough to supplement electricity to the battery, the energy recovery is kept at the 2 gear, and the kinetic energy of the automobile is recovered continuously; if R is less than or equal to 0, the electric quantity generated by only the energy recovery 2 gear is not enough to supplement the electricity to the battery, and besides the energy recovery is still in the 2 gear, the engine is started and is set in the 2 gear to drive the generator to generate electricity.
(2) If the automobile is in a sliding state and the sliding duty ratio Q is more than or equal to 20 percent, judging that the automobile is in a sliding state with high sliding frequency; the controller judges the value of the SOC of the battery by utilizing a battery module for monitoring the voltage and the current of the battery;
1) if the SOC is more than or equal to 60 percent, the residual electric quantity in the battery is sufficient, the vehicle enters an energy recovery 2 gear, the vehicle speed is controlled by using the braking force during stronger energy recovery, the controller detects and judges the change rate R of the electric quantity of the battery, if the R is more than 0, the electric quantity generated by the energy recovery 2 gear is enough to supplement the electricity to the battery, the energy recovery 2 gear is kept, and the kinetic energy of the vehicle is recovered continuously; if R is less than or equal to 0, the electric quantity generated by the energy recovery 2 gear is not enough to supplement electricity to the battery, and the energy recovery is adjusted to 3 gears so as to generate stronger braking force and recover more energy to supplement the electricity to the battery.
2) If the SOC is less than 30% and less than 60%, the residual electric quantity in the battery is moderate, the energy recovery 3 gear is entered, the vehicle speed is controlled by using the braking force during stronger energy recovery, the controller detects and judges the change rate R of the electric quantity of the battery, and if the R is greater than 0, the electric quantity generated by the energy recovery 3 gear is enough to supplement electricity to the battery, the energy recovery 3 gear is kept, so that the kinetic energy of the vehicle is recovered continuously; if R is less than or equal to 0, the electric quantity generated by only recovering the energy in the 3 th gear is not enough to supplement the electricity to the battery, and besides the energy recovery is still in the 3 rd gear, the engine is started and is set in the 1 st gear to drive the generator to generate electricity.
3) If the SOC is less than or equal to 30%, indicating that the residual electric quantity in the battery is insufficient, entering an energy recovery 3-gear, detecting and judging the electric quantity change rate R of the battery by the controller, and if the R is greater than 0, indicating that the electric quantity generated by the energy recovery 3-gear is enough to supplement electricity to the battery, keeping the energy recovery 3-gear so as to continuously recover the kinetic energy of the automobile; if R is less than or equal to 0, the electricity generated by the energy recovery 3 gear is insufficient to supplement electricity to the battery, and besides the energy recovery is still in the 3 gear, the engine is started and is set to the 2 gear to drive the generator to generate electricity.
After the last execution action in S4 or S3 is started, the execution state of the execution action is maintained for a certain time, so that sufficient working time is reserved for the execution action. Preferably, the holding time is 10 minutes.
The hardware in the invention at least comprises: the system comprises a controller, a battery module capable of monitoring the performance of a battery, a motor capable of driving wheels and generating electricity by back dragging of the wheels, a generator and an engine. The controller is connected with and controls the operation of the battery module, the motor, the generator and the engine.
Has the advantages that: according to the extended range type electric automobile energy recovery method based on the sliding state and the power generation intensity, when the controller executes the energy recovery action, the kinetic energy of an automobile is immediately recovered, the wheel is driven by the motor to generate power, corresponding braking force is generated on the wheel, and the kinetic energy of the automobile is recovered, the wheel is driven by the motor to generate power and the corresponding braking force is generated on the wheel without stepping on a brake pedal by a driver; the working state of the engine after starting is divided into 2 gears, wherein 1 gear is an economic mode, and 2 gears are performance modes, so that the energy recovery process is managed more finely, the power of the battery is ensured to be supplemented, the engine outputs less power, the intervention frequency and intensity of the engine are further reduced, and the fuel consumption and the exhaust emission are reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Examples
A range-extended electric vehicle energy recovery method based on a sliding state and power generation intensity comprises the following steps:
s1, starting a controller for energy distribution;
s2, judging the automobile sliding state by the controller;
s3, (1) if the automobile is in a sliding state and the sliding duty ratio Q is less than 20%, determining that the automobile is in a sliding state with low sliding frequency, wherein the control logic takes the running smoothness as the main part at the moment, and the influence of large braking force generated by energy recovery on riding comfort is avoided; the controller judges the value of the SOC of the battery by utilizing a battery module for monitoring the voltage and the current of the battery;
1) if the SOC is more than or equal to 60 percent, the residual electric quantity in the battery is sufficient, the battery enters the 1 st gear with the lowest energy recovery intensity, the braking force generated by energy recovery is weakest, the controller detects and judges the electric quantity change rate R of the battery, if the R is more than 0, the electric quantity generated by the energy recovery 1 st gear is enough to supplement electricity to the battery, the energy recovery 1 st gear is kept, and the kinetic energy of the automobile is recovered continuously; if R is less than or equal to 0, the electric quantity generated by the energy recovery 1 gear is not enough to supplement electricity to the battery, and the energy recovery is adjusted to 2 gears so as to generate stronger braking force and recover more energy.
2) If the SOC is less than 30% and less than 60%, the residual electric quantity in the battery is moderate, an energy recovery 2 gear is entered, the controller detects and judges the change rate R of the electric quantity of the battery, and if the R is greater than 0, the electric quantity generated by the energy recovery 2 gear is enough to supplement the electricity to the battery, the energy recovery 2 gear is kept, so that the kinetic energy of the automobile is recovered continuously; if R is less than or equal to 0, the electric quantity generated by only the energy recovery 2 gear is not enough to supplement the electricity to the battery, and besides the energy recovery is still in the 2 gear, the engine is started and is set to the 1 gear to drive the generator to generate electricity.
3) If the SOC is less than or equal to 30%, the residual electric quantity in the battery is insufficient, the energy recovery 2 gear is entered, the controller detects and judges the electric quantity change rate R of the battery, if the R is greater than 0, the electric quantity generated by the energy recovery 2 gear is enough to supplement electricity to the battery, the energy recovery is kept at the 2 gear, and the kinetic energy of the automobile is recovered continuously; if R is less than or equal to 0, the electric quantity generated by only the energy recovery 2 gear is not enough to supplement the electricity to the battery, besides the energy recovery is still in the 2 gear, the engine is started and is set in the 2 gear to drive the generator to generate electricity, so that the electricity can be supplemented to the battery more quickly.
(2) If the automobile is in a sliding state and the sliding duty ratio Q is more than or equal to 20 percent, judging that the automobile is in a sliding state with high sliding frequency; the control logic takes energy recovery as a main part, fully utilizes the sliding state of the automobile to recover kinetic energy, avoids the influence on the driving mileage of the automobile caused by the over-low electric quantity of the battery, and conforms to the intention of a driver trying to control or limit the speed at the moment, and utilizes a battery module for monitoring the voltage and the current of the battery, and a controller judges the value of the SOC of the battery;
1) if the SOC is more than or equal to 60 percent, the residual electric quantity in the battery is sufficient, the vehicle enters an energy recovery 2 gear, the vehicle speed is controlled by using the braking force during stronger energy recovery, the controller detects and judges the change rate R of the electric quantity of the battery, if the R is more than 0, the electric quantity generated by the energy recovery 2 gear is enough to supplement the electricity to the battery, the energy recovery 2 gear is kept, and the kinetic energy of the vehicle is recovered continuously; if R is less than or equal to 0, the electric quantity generated by the energy recovery 2 gear is not enough to supplement electricity to the battery, and the energy recovery is adjusted to 3 gears so as to generate stronger braking force and recover more energy to supplement the electricity to the battery.
2) If the SOC is less than 30% and less than 60%, the residual electric quantity in the battery is moderate, the energy recovery 3 gear is entered, the vehicle speed is controlled by using the braking force during stronger energy recovery, the controller detects and judges the change rate R of the electric quantity of the battery, and if the R is greater than 0, the electric quantity generated by the energy recovery 3 gear is enough to supplement electricity to the battery, the energy recovery 3 gear is kept, so that the kinetic energy of the vehicle is recovered continuously; if R is less than or equal to 0, the electric quantity generated by only recovering the energy in the 3 th gear is not enough to supplement the electricity to the battery, besides the energy recovery is still in the 3 rd gear, the engine is started, and the 1 st gear is set to drive the generator to generate electricity.
3) If the SOC is less than or equal to 30%, indicating that the residual electric quantity in the battery is insufficient, entering an energy recovery 3-gear, detecting and judging the electric quantity change rate R of the battery by the controller, and if the R is greater than 0, indicating that the electric quantity generated by the energy recovery 3-gear is enough to supplement the electricity to the battery, keeping the energy recovery 3-gear so as to continuously recover the kinetic energy of the automobile; if R is less than or equal to 0, the electric quantity generated by only recovering 3 gears is not enough to supplement the electricity to the battery, besides the energy recovery is still in 3 gears, the engine is started and is set to 2 gears to drive the generator to generate electricity, so that the electricity can be supplemented to the battery more quickly.
After the last execution action in S4 or S3 is started, the execution state of the execution action is maintained for a certain time, so that sufficient working time is reserved for the execution action. Preferably, the holding time is 10 minutes.
The energy recovery in the invention can immediately recover the kinetic energy of the automobile when the controller executes the energy recovery action, so that the wheels drag the motor to generate power, corresponding braking force is generated on the wheels, and the engine can output smaller power while ensuring the power supply to the battery, thereby further reducing the intervention frequency and intensity of the engine, and reducing the fuel consumption and the exhaust emission.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The extended-range electric vehicle energy recovery method based on the gliding state and the power generation intensity is characterized in that the charging time of a battery is selected through a gliding duty ratio Q, and the charging speed of the battery is intervened, wherein the gliding duty ratio Q is the percentage of the time of the vehicle in the gliding state every minute; the controller takes minutes as a basic metering time period to calculate the coasting duty ratio of the controller in real time; the controller monitors the action of the accelerator pedal in real time, when the accelerator pedal is in an initial position, the accelerator pedal is determined as an automobile sliding state, and when the automobile is in the sliding state, the controller enables the automobile to enter an energy recovery state, namely, a generator is driven by wheels to charge a battery and generate braking force; when the accelerator pedal is not in the initial position state, the state is used as a driving state, and the automobile is driven by the motor to run;
the engine is started and then drives the generator to generate power with set power, the working state of the engine after being started is divided into 2 gears, wherein the 1 gear is an economic mode, and the power output of the engine is low;
the 2 gear is a performance mode, and the power output of the engine is higher; the energy recovery intensity is from low to high, and is in the order of 1 grade, 2 grades and 3 grades;
accurately monitoring the charging and discharging speed of the battery by adopting the battery electric quantity change rate R, namely the change value of the battery SOC per minute, selecting the charging time of the battery in advance and intervening the charging speed of the battery; when the electric quantity of the battery is increased, R is a positive value, and when the electric quantity of the battery is decreased, R is a negative value;
the method specifically comprises the following steps:
s1, starting a controller for energy distribution;
s2, judging the automobile sliding state by the controller;
s3: s31, if the automobile is in a coasting state and the coasting duty ratio Q is less than 20%, determining that the automobile is in a coasting state with low coasting frequency; the controller judges the value of the SOC of the battery by utilizing a battery module for monitoring the voltage and the current of the battery;
s311, if the SOC is more than or equal to 60%, entering a 1 st gear with the lowest energy recovery intensity, detecting and judging the change rate R of the electric quantity of the battery by the controller, and if R is more than 0, keeping the 1 st gear of the energy recovery; if R is less than or equal to 0, the energy recovery is adjusted to 2 grades so as to generate stronger braking force and recover more energy;
s312, if the SOC is less than 60% and is 30%, entering an energy recovery 2-gear, detecting the change rate R of the battery electric quantity by the controller, and if R is greater than 0, keeping the energy recovery 2-gear; if R is less than or equal to 0, still enabling the energy recovery to be in the 2-gear, and simultaneously starting the engine and setting the engine in the 1-gear to drive the generator to generate electricity;
s313, if the SOC is less than or equal to 30%, entering an energy recovery 2 gear, detecting and judging the change rate R of the electric quantity of the battery by the controller, and if R is greater than 0, keeping the energy recovery at the 2 gear so as to continuously recover the kinetic energy of the automobile; if R is less than or equal to 0, the engine is started and is set to be in the 2-gear to drive the generator to generate electricity besides still enabling the energy recovery to be in the 2-gear;
s32, if the automobile is in a sliding state and the sliding duty ratio Q is more than or equal to 20%, determining that the automobile is in a sliding state with high sliding frequency; the controller judges the value of the SOC of the battery by utilizing a battery module for monitoring the voltage and the current of the battery;
s321, if the SOC is larger than or equal to 60%, entering a 2-gear energy recovery intensity, detecting and judging the change rate R of the battery electric quantity by the controller, and if the R is larger than 0, keeping the 2-gear energy recovery; if R is less than or equal to 0, adjusting the energy recovery to 3 grades;
s322, if the SOC is less than 30% and less than 60%, entering an energy recovery 3-gear, detecting and judging the change rate R of the battery electric quantity by the controller, and if the R is greater than 0, keeping the energy recovery 3-gear so as to continuously recover the kinetic energy of the automobile; if R is less than or equal to 0, the engine is started and set to be in the 1 gear to drive the generator to generate power, besides the energy recovery is still in the 3 gear;
s323, if the SOC is less than or equal to 30%, entering an energy recovery 3-gear, detecting and judging the electric quantity change rate R of the battery by the controller, and if R is greater than 0, keeping the energy recovery 3-gear so as to continuously recover the kinetic energy of the automobile; if R is less than or equal to 0, the engine is started and is set to be 2 to drive the generator to generate electricity, besides the energy recovery is still in 3 gear;
after the last execution action in S4 and S3 is started, the execution state of the execution action is maintained for a certain time, so that enough working time is reserved for the execution action, and then the process returns to S2.
2. The energy recovery method for extended range electric vehicle according to claim 1, wherein the energy recovery method comprises the steps of,
the recovery intensity of the 1 st stage is 25% of the maximum energy recovery intensity, the recovery intensity of the 2 nd stage is 50% of the maximum energy recovery intensity, and the recovery intensity of the 3 rd stage is the maximum energy recovery intensity;
the power output of the engine is 50% of the maximum output power when the engine is in the 1-gear; in gear 2, engine power output is at a maximum.
3. The method as claimed in claim 1, wherein the coasting state includes a braking process when the driver steps on the brake pedal.
4. The energy recovery method of extended-range electric vehicle according to claim 1, wherein the step of maintaining the execution state of the execution operation for 10 minutes in S4 is further included.
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