CN114954130A - Energy prediction-based extended range electric vehicle energy management control method - Google Patents

Energy prediction-based extended range electric vehicle energy management control method Download PDF

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CN114954130A
CN114954130A CN202210848240.1A CN202210848240A CN114954130A CN 114954130 A CN114954130 A CN 114954130A CN 202210848240 A CN202210848240 A CN 202210848240A CN 114954130 A CN114954130 A CN 114954130A
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control method
battery
electric
electric vehicle
energy
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许玉辙
汪伟
刘田奇
张焱
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Jiangsu University of Technology
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Jiangsu University of Technology
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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]
    • 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
    • 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
    • B60L2260/00—Operating Modes
    • B60L2260/40—Control modes
    • B60L2260/50—Control modes by future state prediction
    • B60L2260/52—Control modes by future state prediction drive range estimation, e.g. of estimation of available travel distance
    • 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
    • B60L2260/00—Operating Modes
    • B60L2260/40—Control modes
    • B60L2260/50—Control modes by future state prediction
    • B60L2260/54—Energy consumption estimation
    • 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

Abstract

The invention discloses an energy management control method of a range-extended electric vehicle based on energy estimation, which comprises the steps of firstly obtaining road information of travel through an electric vehicle navigation system when the electric vehicle starts, enabling the electric quantity of the electric vehicle to be always kept above an electric quantity lower limit value in the driving process through a coordinated range extender control method 1 and a coordinated range extender control method 2, and charging a power battery in advance through the control method 2 before the electric vehicle enters an urban road so as to ensure that the electric quantity of the power battery can meet the requirement of the rest urban road, so that the electric vehicle can drive under the urban road completely by the energy provided by the power battery, and further improving the fuel economy of the vehicle.

Description

Energy prediction-based extended range electric vehicle energy management control method
Technical Field
The invention belongs to the field of new energy electric automobiles, and particularly relates to an energy management control method of an extended range electric automobile.
Background
With the increasing global environmental problems and energy crisis, the policy of 'carbon neutralization' and 'carbon peak-reaching' is proposed, and the rapid development of new energy electric vehicles is reluctant. Aiming at a series of problems of short battery life, short driving range, long charging time and the like of the existing pure electric vehicle, the extended range electric vehicle can fully combine the advantages of the battery life and the driving range. Therefore, the vigorous popularization and research of the extended range electric vehicle have become a hot topic in the research field of the current new energy electric vehicle.
The extended range electric vehicle is a hybrid electric vehicle, and the basic structure of the extended range electric vehicle is a unique series hybrid electric vehicle. The power system of the range-extended electric vehicle consists of a range extender (an engine and a generator), a power battery, a driving motor, a main speed reducer, a differential and the like, and the energy management method has important influence on the dynamic property and the economical efficiency of the whole range-extended electric vehicle. Therefore, in engineering practice, the economy of the whole vehicle needs to be improved to the greatest extent on the premise of meeting the dynamic property of the whole vehicle by setting a reasonable energy management method.
The energy management method of the extended range electric vehicle can be roughly divided into a rule-based method and an optimization-based method at present, and the rule-based energy management method is simple and is convenient to realize in engineering application, so most of research is developed on the basis of the rule-based energy management method. However, the existing rule-based energy management method has a problem that the range extender works in an efficient fuel consumption area under an expressway, but once the electric automobile enters an urban road with large speed change, the range extender can not work in the efficient fuel consumption area of an engine any more, so that the oil consumption is increased, the charging efficiency is reduced, and the economic performance of the whole automobile is reduced. If the electric automobile can completely run by the power battery after entering the urban road after the expressway is finished, and the range extender does not work, the problems can be solved, and the economic performance of the electric automobile is improved. Therefore, the invention provides an energy management control method of a range-extended electric vehicle based on energy estimation, which can be used for pre-estimating the required energy of the electric vehicle in an urban road to be entered, so as to supplement energy in advance on an expressway, so that after the electric vehicle enters the urban road, the electric quantity reserve of a power battery of the electric vehicle can meet the energy requirement on the urban road, and a range extender is prevented from being started on the urban road, so that the economy of the whole vehicle is further improved.
Disclosure of Invention
Aiming at the problem that the driving road of the electric automobile is not fully considered in the current energy management strategy of the extended range electric automobile, the invention provides an energy management method of the extended range electric automobile based on energy estimation. When an electric automobile starts, road information of a trip is obtained through an electric automobile navigation system, the electric quantity of the electric automobile can be kept above an electric quantity lower limit value all the time in the driving process through the control method 1 and the control method 2 through the coordination range extender, and before the electric automobile enters an urban road, the power battery is charged in advance through the control method 2, so that the electric quantity of the power battery can meet the requirements of the rest urban road, the electric automobile can be driven under the urban road completely by the energy provided by the power battery, and the fuel economy of the automobile is further improved.
The working mode of the range extender control method 1 is as follows: the electric power output by the generator in the range extender is equal to the power required by the running of the electric automobile, and no redundant power is used for supplementing extra energy to the power battery. Therefore, the battery power can be kept constant at a certain value on the premise of meeting the energy requirement of the electric automobile in driving. The working mode of the control method 2 is as follows: the engine in the range extender works at the maximum power point of the optimal fuel consumption area, and after the power generated by the generator meets the power required by the current electric automobile in running, extra power is remained to supplement the electric energy of the battery.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an extended range electric vehicle energy management control method based on energy estimation, which is characterized by comprising the following steps of:
step S11: calculating mileage S of urban road in travel route City (R) ；
Step S12: calculating the required electric quantity Q under the mileage of the urban road;
step S13: and calculating the mileage L required when the electricity quantity Q required by charging is reached under the expressway.
Step S14: to avoid the power cells from being over-discharged and affecting the life of the cells, the cells are usually provided with a lower limit. If the battery capacity does not reach the lower limit value, the judgment is repeated.
Step S15: when the electric automobile runs until the battery capacity reaches the lower limit value, the range extender is started and firstly provides energy for the running of the electric automobile by the control method 1.
Step S16: and judging whether the vehicle runs to a position which is a distance L away from the high-speed exit, and if not, repeatedly judging.
Step S17: when the electric automobile runs to a distance L away from the high-speed exit, the control method 2 needs to be switched to precharge the battery.
Step S18: when the battery is charged to the required pre-charging quantity Q, namely the electric automobile just drives away from the expressway to enter an urban road, the range extender enters a closed state, and the electric automobile runs purely on the urban road by using the residual electric quantity Q.
The technical scheme of the invention has the following remarkable advantages:
1. according to the invention, by combining the running road condition of the electric automobile, the two control methods are switched when the switching conditions are met, so that the problem that the engine cannot work in the optimal fuel area when the range extender is always in the control method 1 after being started is avoided, the problem that the service life of the battery is influenced by frequent charging of the battery when the range extender is always in the control method 2 is also avoided, and the fuel economy of the electric automobile and the service life of the power battery are effectively improved.
2. According to the energy management control method based on energy estimation, the electric automobile is enabled to run in a pure electric mode when entering the urban road with large speed change by estimating the electric quantity required under the urban road in advance, noise generated when a range extender works is avoided, and the comfort of a driver under the urban road is improved.
Drawings
Fig. 1 is a flow chart of a scheme of the invention when the road condition is in a smooth state during the pre-charging process.
Fig. 2 is a flow chart of a scheme of the invention in a road condition congestion state during a pre-charging process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides an extended range electric vehicle energy management control method based on energy estimation. When the electric automobile enters an expressway to run after starting, and the battery power is reduced to a set lower limit value, the range extender is opened, and then the range extender works in the control method 1. After the control unit calculates the required electric quantity of the urban road in advance, the range extender is switched to the control method 2 to work at the position where the electric automobile runs to the control method switching position, and the battery is pre-charged with the required electric quantity of the urban road. And when the electric automobile runs to the end point of the expressway, the range extender is closed, and at the moment, the electric quantity of the battery can meet the electric energy required by the rest urban roads. Under the rest urban roads, the motor of the electric automobile completely works by the energy provided by the battery, and the real zero emission and zero pollution are realized. The flow chart of the method is shown in fig. 1, and comprises the following steps:
step S11: calculating the mileage of the urban road in the travel route: the urban mileage specified in the scheme comprises the remaining mileage obtained by removing the expressway mileage from the trip route acquired by the vehicle-mounted navigation system. When the total mileage of the electric automobile is S General assembly The mileage of the expressway is S Height of And then the mileage of the rest city road is recorded as S City (R) In which S is City (R) ＝S General assembly -S Height of (1)
Step S12: calculating the required electric quantity under the mileage of the urban road: the speed limit conditions of different road sections contained under urban roads in the travel route are obtained through the vehicle-mounted navigation system, and the power consumption of the electric vehicle in each kilometer of the different speed limit road sections is calculated. The specific method comprises the following steps: the power consumption of the electric automobile per kilometer under 4 different average speeds is measured in advance through tests, and the driving mileage per Kwh, namely the driving of each kilowatt hour is calculatedMileage, and storing the data in advance in a vehicle storage unit; by calling the stored driving mileage a of each degree of electricity under different speed-limiting road sections i (Km) (i is 1 and 2 … n), calculating the total electric quantity required by all road sections driven by the urban road into which the electric automobile is about to drive, namely calculating the electric quantity required to be stored in a power battery before the electric automobile enters the city, and recording the electric quantity as Q:
Figure BDA0003753847800000041
in the formula: q is the electric quantity value of the power battery when the electric automobile enters the urban road, S 1 、S 2 …S n Is the mileage of different speed-limiting road sections under the city driving road, a 1 、a 2 、...a n The driving mileage per degree of electricity is 30, 40, 60, 80km/h, respectively, at the average vehicle speed under the city condition stored in step S3.
Step S13: calculating the mileage L required when the required electric quantity Q is charged under the expressway: first, a mathematical expression for determining the position at which the range extender switches to the control method 2 to precharge the battery is determined: according to the scheme, the driving mileage b required by the power battery for supplementing electricity per degree is obtained through a test in advance when the range extender drives under the control method 2 with the average speed of 100 km/h. And combining the required electric quantity value Q under the urban road obtained in step S3, further determining that the required driving mileage is recorded as L when the range extender of the electric vehicle under the expressway charges the power battery in the control method 2 until the electric quantity reaches Q, where L ═ Q × (3) is as follows: l is the distance of the electric automobile to be driven when the battery power supply is Q under the control method 2, namely the distance between the electric automobile and the exit of the expressway; and b is the driving mileage required by the power battery to supplement each degree of electricity under the expressway and the control method 2. The reason why the invention firstly works in the control method 1 and does not adopt the control method 2 after the range extender is started is that: the control method 1 can avoid the influence on the service life of the battery due to frequent charging and discharging of the battery. When energy pre-storage is needed in the later period, the control method 2 is adopted because the engine always works in a high-fuel-efficiency area to supplement electric energy to the battery, the charging efficiency is higher, and the oil consumption of the engine is lower.
Step S14: to avoid the power cells from being over-discharged and affecting the life of the cells, the cells are usually provided with a lower limit. If the battery capacity does not reach the lower limit value, the judgment is repeated.
Step S15: when the electric automobile runs until the battery capacity reaches the lower limit value, the range extender is started and firstly provides energy for the running of the electric automobile by the control method 1.
Step S16: and judging whether the vehicle runs to a position which is a distance L away from the high-speed exit, and if not, repeatedly judging.
Step S17: when the electric automobile runs to a distance L away from the high-speed exit, the control method 2 needs to be switched to for pre-charging the battery.
Step S18: when the battery is charged to the required pre-charging quantity Q, namely the electric automobile just drives away from the expressway to enter an urban road, the range extender enters a closed state, and the electric automobile is driven purely on the urban road by the residual electric quantity Q.
If the battery cannot be charged to the required electric quantity at the end of the expressway due to other influence factors, the range extender is started again when the electric quantity of the battery is reduced to the lower limit value but the journey is not finished after the electric automobile enters the urban road, and the electric automobile is ensured to run to the destination by the control method 1. At this time, the control method 1 is adopted because the electric automobile stops soon, the battery electric quantity is kept unchanged at the lower limit value by adopting the control method 1, and the external power grid can be fully utilized for charging after the automobile stops so as to reasonably utilize the power source of the power grid.
The invention also provides an energy management control method of the extended-range electric automobile based on energy estimation, which is realized when the electric automobile meets a traffic jam condition in the pre-charging process. The flow chart is shown in fig. 2, and comprises the following steps:
step S21: calculating the mileage of the urban road in the travel route: the urban mileage specified in the scheme comprises the surplus mileage obtained by removing the highway mileage from the trip route acquired by the vehicle-mounted navigation systemThe number of the processes. When the total mileage of the electric automobile is S General assembly The mileage of the expressway is S Height of And then the mileage of the rest city road is recorded as S City (R) In which S is City (R) ＝S General assembly -S Height of (1)
Step S22: calculating the required electric quantity under the mileage of the urban road: the speed limit conditions of different road sections contained under urban roads in the travel route are obtained through the vehicle-mounted navigation system, and the power consumption of the electric vehicle in each kilometer of the different speed limit road sections is calculated. The specific method comprises the following steps: the method comprises the steps of measuring the power consumption of the electric automobile per kilometer under 4 different average speeds in advance through tests, calculating the driving mileage per Kwh, namely the driving mileage per watt-hour, and storing the data in a vehicle storage unit in advance; by calling the stored driving mileage a of each degree of electricity under different speed-limiting road sections i (Km) (i is 1 and 2 … n), calculating the total electric quantity required by all road sections driven by the urban road into which the electric automobile is about to drive, namely calculating the electric quantity required to be stored in a power battery before the electric automobile enters the city, and recording the electric quantity as Q:
Figure BDA0003753847800000051
in the formula: q is the electric quantity value of the power battery when the electric automobile enters the urban road, S 1 、S 2 …S n Is the mileage of different speed-limiting road sections under the city driving road, a 1 、a 2 、...a n The driving mileage per degree of electricity is 30, 40, 60, 80km/h, respectively, at the average vehicle speed under the city condition stored in step S3.
Step S23: calculating the mileage L required when the required electric quantity Q is charged under the expressway: first, a mathematical expression for determining the position at which the range extender switches to the control method 2 to precharge the battery is determined: according to the scheme, the driving mileage b required by the power battery for supplementing electricity per degree is obtained through a test in advance when the range extender drives under the control method 2 with the average speed of 100 km/h. And combining the required electric quantity value Q under the urban road obtained in step S3, further determining that the required driving mileage is recorded as L when the range extender of the electric vehicle under the expressway charges the power battery in the control method 2 until the electric quantity reaches Q, where L ═ Q × (3) is as follows: l is the distance of the electric automobile to be driven when the battery power supply is Q under the control method 2, namely the distance between the electric automobile and the exit of the expressway; and b is the driving mileage required by the power battery to supplement each degree of electricity under the expressway and the control method 2. The reason why the invention firstly works in the control method 1 and does not adopt the control method 2 after the range extender is started is that: the control method 1 can avoid the influence on the service life of the battery due to frequent charging and discharging of the battery. When energy pre-storage is needed in the later period, the control method 2 is adopted because the engine always works in a high-fuel-efficiency area to supplement electric energy to the battery, the charging efficiency is higher, and the oil consumption of the engine is lower.
Step S24: to avoid the power cells from being over-discharged and affecting the life of the cells, the cells are usually provided with a lower limit. If the battery capacity does not reach the lower limit value, the judgment is repeated.
Step S25: when the electric automobile runs until the battery capacity reaches the lower limit value, the range extender is started and firstly provides energy for the running of the electric automobile by the control method 1.
Step S26: and judging whether the vehicle runs to a position which is a distance L away from the high-speed exit, and if not, repeatedly judging.
Step S27: when the electric automobile runs to a distance L away from the high-speed exit, the control method 2 needs to be switched to for pre-charging the battery.
Step S28: when the electric automobile is precharged by the control method 2, the precharging process is completed in advance when a congested road section is met, the range extender is not closed in the remaining high-speed mileage, and the control method 1 is switched to maintain the current battery capacity at the current value, so that the precharged battery capacity of the electric automobile is not consumed before the electric automobile is driven out of an exit of the highway.
Step S29: and judging whether the electric automobile enters the urban road or not, if not, continuing to work by the control method 1.
Step S210: when the electric automobile enters an urban road, the electric automobile just exits from an exit of the expressway, the range extender is closed, and the electric automobile runs in a pure electric mode.
If the battery cannot be charged to the required electric quantity at the end of the expressway due to other influence factors, after the electric automobile enters the urban road, when the battery electric quantity is reduced to the lower limit value but the journey is not finished yet, the range extender is started again, and the electric automobile is ensured to run to the destination by the control method 1. At this time, the control method 1 is adopted because the electric automobile stops soon, the battery electric quantity is kept unchanged at the lower limit value by adopting the control method 1, and the external power grid can be fully utilized for charging after the automobile stops so as to reasonably utilize the power source of the power grid.

Claims (11)

1. An extended range electric vehicle energy management control method based on energy estimation is characterized by comprising the following steps:
step S11: calculating mileage S of urban road in travel route City (R) ；
Step S12: calculating the required electric quantity Q under the mileage of the urban road;
step S13: calculating the mileage L required by charging to the required electric quantity Q under the expressway;
step S14: in order to avoid the influence of over-discharge of a power battery on the service life of the battery, the battery is usually provided with a lower limit value, and if the battery does not run until the electric quantity of the battery reaches the lower limit value, the judgment is repeated;
step S15: when the electric automobile runs until the electric quantity of the battery reaches a lower limit value, the range extender is started and firstly provides energy for the running of the electric automobile by using the control method 1;
step S16: judging whether the vehicle runs to a position which is a distance L away from the high-speed exit, and if not, repeatedly judging;
step S17: when the electric automobile runs to a distance L away from the high-speed exit, switching to the control method 2 to pre-charge the battery at the moment;
step S18: when the battery is charged to the required pre-charging quantity Q, namely the electric automobile just drives away from the expressway to enter an urban road, the range extender enters a closed state, and the electric automobile runs purely on the urban road by using the residual electric quantity Q.
2. The energy management control method for the extended-range electric vehicle based on energy estimation of claim 1, wherein the step S12 is specifically to obtain speed limit conditions of different road sections included in an urban road in a travel route through a vehicle-mounted navigation system, calculate power consumption per kilometer of the electric vehicle in the different speed limit road sections, that is, the distance traveled per degree of electricity in the different speed limit road sections, and store the data in a vehicle storage unit in advance; and calculating the total electric quantity Q required by all the road sections driven by the urban road to which the electric automobile is about to drive by calling the stored driving mileage per degree of electricity under different speed-limiting road sections.
3. The energy management control method for the extended-range electric vehicle based on the energy estimation as claimed in claim 2, wherein the specific method for calculating the power consumption of the electric vehicle per kilometer in different speed-limiting road sections comprises: the power consumption of the automobile per kilometer under 4 different average speeds is measured in advance through tests, and the driving mileage per Kwh, namely the driving mileage per watt electricity under different speed-limiting road sections, is calculated.
4. The energy management control method for the extended-range electric vehicle based on the energy estimation as claimed in claim 3, wherein: the 4 different average vehicle speeds are respectively 30, 40, 60 and 80 km/h.
5. The energy management control method for the extended-range electric vehicle based on the energy estimation as claimed in claim 1, wherein: the step S13 is specifically to determine the position where the range extender switches from the control method 1 to the control method 2 to precharge the battery, that is, the distance L from the automobile to the high-speed exit.
6. The energy management control method for the extended-range electric vehicle based on the energy estimation as claimed in claim 5, wherein: the working characteristics of the control method 1 are that the electric power output by the range extender is changed in real time, the electric power output by the range extender is equal to the power required by the real-time running of the electric automobile, and no redundant electric energy is used for supplementing the battery.
7. The energy management control method for the extended-range electric vehicle based on the energy estimation as claimed in claim 5, wherein: the control method 2 has the working characteristic that the electric power output by the range extender is constant, and redundant electric power is used for charging the battery after the electric automobile is ensured to run normally.
8. The energy management control method for the extended-range electric vehicle based on the energy estimation as claimed in claim 1, wherein: the battery lower limit value in step S14 is set to 20% of the total battery capacity.
9. The energy management control method of claim 1, wherein in step S18, when the battery is charged to the required pre-charge Q, but if the battery cannot be charged to the required charge due to other influence factors at the end of the expressway, the range extender is turned on again after the electric vehicle enters the urban road, when the battery charge is reduced to the lower limit value but the journey is not yet finished, and the electric vehicle is guaranteed to travel to the destination by the control method 1.
10. The energy management control method for the extended-range electric vehicle based on the energy estimation as claimed in claim 1, wherein after the step S17 is switched to the control method 2 to precharge the battery, if the precharge process is completed earlier due to a congested road section, the range extender will not be turned off in the remaining high-speed mileage, and the control method 1 is switched to maintain the current battery charge at the current value, so as to ensure that the precharged charge of the vehicle is not consumed before exiting the exit of the highway.
11. The energy management control method of claim 9, wherein the pre-charging process is completed in advance when a congested road section is encountered, but if the battery cannot be charged to the required capacity at the end of the expressway due to other influencing factors, after the electric vehicle enters an urban road, when the battery capacity decreases to the lower limit value but the journey is not yet finished, the range extender is turned on again, and the electric vehicle is guaranteed to travel to the destination by the control method 1.
CN202210848240.1A 2022-07-19 2022-07-19 Energy prediction-based extended range electric vehicle energy management control method Pending CN114954130A (en)

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