CN111852713B - Method and device for reducing fuel consumption of hybrid electric vehicle, electronic equipment and storage medium - Google Patents

Method and device for reducing fuel consumption of hybrid electric vehicle, electronic equipment and storage medium Download PDF

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Publication number
CN111852713B
CN111852713B CN202010552632.4A CN202010552632A CN111852713B CN 111852713 B CN111852713 B CN 111852713B CN 202010552632 A CN202010552632 A CN 202010552632A CN 111852713 B CN111852713 B CN 111852713B
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engine
charge
vehicle speed
battery
state
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CN111852713A (en
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严渊
刘义强
吴杰
王永建
金昶明
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Zhejiang Geely Holding Group Co Ltd
Yiwu Geely Powertrain Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Yiwu Geely Powertrain Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of 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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • F02N11/0833—Vehicle conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/244—Charge state
    • 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
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • 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
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The application provides a method, a device, electronic equipment and a storage medium for reducing oil consumption of a hybrid electric vehicle, wherein the method comprises the following steps: acquiring the average vehicle speed at the historical moment, the vehicle speed at the current moment and the battery charge state at the current moment; acquiring a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical moment and the battery charge state at the current moment; acquiring a battery state of charge limit set for starting the engine and a battery state of charge limit set for stopping the engine according to the average speed at the historical moment; determining the engine state at the current moment; and realizing the start-stop control of the engine according to the vehicle speed limit value for starting the engine, the vehicle speed limit value for stopping the engine, the battery state of charge limit value set for starting the engine, the battery state of charge limit value set for stopping the engine, the vehicle speed at the current moment and the battery state of charge at the current moment. The method can effectively reduce the oil consumption of the hybrid electric vehicle.

Description

Method and device for reducing oil consumption of hybrid electric vehicle, electronic equipment and storage medium
Technical Field
The present disclosure relates to the field of hybrid vehicles, and more particularly, to a method and an apparatus for reducing fuel consumption of a hybrid vehicle, an electronic device and a storage medium.
Background
The hybrid vehicle is provided with two power sources of an internal combustion engine and a motor, the starting and stopping of the engine are completely decoupled with the motion of the vehicle, the starting and stopping of the engine are determined by a starting and stopping control strategy in a controller, and when the controller judges that the starting condition is not met, the whole vehicle is driven by the motor. The general operating conditions of the hybrid electric vehicle are as follows, in urban working conditions, the vehicle runs at low speed, the motor is used for driving as much as possible, and the inefficient operation of the engine is avoided; in a high-speed working condition, the engine needs to be started to charge the battery, store energy, optimize the running working condition of the engine and maximize the efficiency of the system. Hybrid vehicles in the current market mainly reduce the fuel consumption of the whole vehicle by optimizing an engine start-stop strategy and adjusting an energy management strategy.
In the prior art, a vehicle speed start-stop management strategy generally sets a fixed vehicle speed limit value to realize the start-stop control of an engine, the vehicle speed is higher than an upper limit value to request the start of the engine, and the vehicle speed is lower than a lower limit value to request the stop of the engine; the start-stop management strategy generally sets a fixed battery state of charge limit value to realize the start-stop control of the engine, the state of charge of the battery is lower than the lower limit value of the state of charge of the battery to request the start of the engine, and the state of charge of the battery is higher than the upper limit value to request the shutdown of the engine. The energy management strategy is typically such that under engine operating conditions, the engine will charge the battery until the battery is fully charged.
The following problems can be faced by adopting the scheme: firstly, when the vehicle runs for a long time under a congestion working condition, the electric quantity of a battery can drop all the time due to the fact that a starting vehicle speed threshold cannot be reached until an idling working condition occurs, the efficiency of an engine is low, the charging efficiency of a motor is low, the oil consumption is high, and the NVH problem can be caused; secondly, aiming at the current suburb working condition or the working condition that the vehicle frequently stops and runs, the motor is frequently used for starting, high-power discharging is carried out, then the engine is used for charging, the efficiency of charging and discharging is not high, and the oil consumption is high; in addition, for a short-distance trip client driving in suburbs, the engine may be charged in the whole process, and the oil consumption is high.
Disclosure of Invention
The application aims to solve the technical problem that the oil consumption of the hybrid electric vehicle is higher.
In order to solve the technical problem, the embodiment of the application discloses a method for reducing oil consumption of a hybrid electric vehicle, which comprises the following steps:
acquiring the average vehicle speed at the historical moment, the vehicle speed at the current moment and the battery charge state at the current moment;
acquiring a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical moment and the battery charge state at the current moment; acquiring a battery state of charge limit set for starting the engine and a battery state of charge limit set for stopping the engine according to the average speed at the historical moment;
determining an engine state at a current time, the engine state at the current time comprising engine operation and engine stop;
if the engine state at the current moment is the engine stop, controlling the engine to start according to the vehicle speed limit value for starting the engine, the battery state of charge limit value set for starting the engine, the vehicle speed at the current moment and the battery state of charge at the current moment;
or;
and if the engine state at the current moment is the engine running state, controlling the engine to stop according to the vehicle speed limit value for stopping the engine, the battery charge state limit value for stopping the engine, the vehicle speed at the current moment and the battery charge state at the current moment.
Further, the set of battery state of charge limits for the starting engine includes a first starting engine battery state of charge limit and a second starting engine battery state of charge limit;
the set of battery state of charge limits to stop the engine includes a first stopped engine battery state of charge limit and a second stopped engine battery state of charge limit.
The battery state of charge limit of the second starting engine is smaller than the battery state of charge limit of the first starting engine; the battery state of charge limit of the first stopped engine is less than the battery state of charge limit of the second stopped engine.
Further, controlling the engine to start according to the vehicle speed limit value for starting the engine, the battery state of charge limit value set for starting the engine, the vehicle speed at the current moment and the battery state of charge at the current moment; the method comprises the following steps:
if the vehicle speed at the current moment is higher than the vehicle speed limit value of the starting engine and the battery charge state at the current moment is lower than the battery charge state limit value of the first starting engine, controlling the starting of the engine;
or;
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the starting engine and the battery charge state at the current moment is lower than the battery charge state limit value of a second starting engine, controlling the starting of the engine;
controlling engine stop based on a vehicle speed limit for stopping the engine, a vehicle speed at a current time of a set of battery state of charge limits for stopping the engine, and a battery state of charge at the current time, comprising:
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the stopped engine and the battery charge state at the current moment is higher than the battery charge state limit value of the first stopped engine, controlling the engine to stop;
or;
and controlling the engine to stop if the vehicle speed at the current moment is higher than the vehicle speed limit value for stopping the engine and the battery state of charge at the current moment is higher than the battery state of charge limit value for stopping the engine secondly.
Further, the method further comprises:
acquiring the battery charge state at the engine starting moment and the average vehicle speed of a period of time before the engine starting moment;
the target state of charge of the battery is adjusted according to the state of charge of the battery at the engine start time and the average vehicle speed of a period of time before the engine start time.
The second aspect of the embodiment of the present application provides a device for reducing oil consumption of a hybrid vehicle, including:
the acquisition module is used for acquiring the average vehicle speed at the historical moment, the vehicle speed at the current moment and the battery charge state at the current moment;
the acquisition module is used for acquiring a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical moment and the battery charge state at the current moment; acquiring a battery state of charge limit set for starting the engine and a battery state of charge limit set for stopping the engine according to the average vehicle speed;
the determining module is used for determining the engine state at the current moment, and the engine state at the current moment comprises engine running and engine stopping;
the engine start-stop control module is used for controlling the engine to start according to the vehicle speed limit value for starting the engine, the battery state of charge limit value set for starting the engine, the vehicle speed at the current moment and the battery state of charge at the current moment if the engine state at the current moment is that the engine stops;
or;
and the engine start-stop control module is used for controlling the engine to stop according to the vehicle speed limit value for stopping the engine, the battery charge state limit value for stopping the engine, the vehicle speed at the current moment and the battery charge state at the current moment.
Further, the set of battery state of charge limits for the starting engine includes a first starting engine battery state of charge limit and a second starting engine battery state of charge limit;
the set of battery state of charge limits to stop the engine includes a first stopped engine battery state of charge limit and a second stopped engine battery state of charge limit.
The battery state of charge limit of the second starting engine is smaller than the battery state of charge limit of the first starting engine; the battery state of charge limit of the first stopped engine is less than the battery state of charge limit of the second stopped engine.
Further, controlling the engine to start according to a vehicle speed limit for starting the engine, a battery state of charge limit set for starting the engine, a vehicle speed at a current time, and a battery state of charge at the current time includes:
if the vehicle speed at the current moment is higher than the vehicle speed limit value of the starting engine and the battery charge state is lower than the battery charge state limit value of the first starting engine, controlling the starting of the engine;
or;
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the starting engine and the battery charge state is lower than the battery charge state limit value of a second starting engine, controlling the starting of the engine;
controlling engine stop based on a vehicle speed limit to stop the engine, a set of battery state of charge limits to stop the engine, a vehicle speed at a current time, and a battery state of charge at the current time, comprising:
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the stopped engine and the battery charge state at the current moment is higher than the battery charge state limit value of the first stopped engine, controlling the engine to stop;
or;
and controlling the engine to stop if the vehicle speed at the current moment is higher than the vehicle speed limit value for stopping the engine and the battery state of charge at the current moment is higher than the battery state of charge limit value for stopping the engine secondly.
Further, the acquisition module is also used for acquiring the battery charge state at the current moment of the engine starting moment and the average vehicle speed of a period of time before the engine starting moment;
the device still includes:
an energy management module; an energy management module; for adjusting the target state of charge of the battery based on the state of charge of the battery at the engine start time and the average vehicle speed over a period of time prior to the engine start time.
A third aspect of the embodiments of the present application provides an electronic device, where the electronic device includes a processor and a memory, where the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement a method for reducing fuel consumption of a hybrid vehicle.
A fourth aspect of the embodiments of the present application provides a computer storage medium, where at least one instruction or at least one program is stored in the storage medium, and the at least one instruction or the at least one program is loaded and executed by a processor to implement a method for reducing fuel consumption of a hybrid vehicle.
By adopting the technical scheme, the application has the following beneficial effects:
according to the method for reducing the oil consumption of the hybrid electric vehicle, the vehicle speed limit values of the start and stop of the engine are adjusted in real time according to the average vehicle speed and the battery electric quantity, the battery charge state limit values of the start and stop of the engine are adjusted according to the average vehicle speed, the battery electric quantity can be effectively prevented from being consumed all the time under the congestion working condition, and the problems of long-time low-efficiency operation and high oil consumption of a low-speed engine are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for reducing fuel consumption of a hybrid vehicle according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating a method for reducing fuel consumption of a hybrid vehicle according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of an apparatus for reducing fuel consumption of a hybrid vehicle according to an embodiment of the present disclosure;
fig. 4 is a schematic view of an apparatus for reducing fuel consumption of a hybrid vehicle according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the present application. In the description of the embodiments of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The following describes a specific embodiment of a method for reducing fuel consumption of a hybrid vehicle in an embodiment of the present application, fig. 1 is a schematic flow chart of the method for reducing fuel consumption of a hybrid vehicle provided in the embodiment of the present application, and the present specification provides method operation steps as in the embodiment or the flow chart, but more or fewer operation steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. In actual system or server product execution, sequential execution or parallel execution (e.g., parallel processor or multithreaded processing environments) may occur according to the embodiments or methods shown in the figures. Specifically, as shown in fig. 1, the method may include:
s101, acquiring the average vehicle speed at the historical moment, the vehicle speed at the current moment and the battery charge state at the current moment;
in the embodiment of the application, the average vehicle speed at the historical moment is the average vehicle speed which is calculated in real time and is a period of time before the current time point, and the running state of the current vehicle can be judged according to the average vehicle speed; in the running process of the vehicle, the method and the device can calculate the actual vehicle speed of one period before each time point in real time to perform weighted average processing, store the actual vehicle speed in the ram and perform iteration processing continuously, so that the average vehicle speed can feed back the running state of the vehicle more truly.
S102, acquiring a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical moment and the battery charge state at the current moment; acquiring a battery state of charge limit set for starting the engine and a battery state of charge limit set for stopping the engine according to the average speed at the historical moment;
in the embodiment of the present application, the set of battery state of charge limits for starting the engines includes a first starting engine battery state of charge limit (high) and a second starting engine battery state of charge limit (low);
the set of battery state of charge limits to stop the engine includes a first stopped engine battery state of charge limit (low) and a second stopped engine battery state of charge limit (high).
The battery state of charge limit of the second starting engine is smaller than the battery state of charge limit of the first starting engine; the battery state of charge limit of the first stopped engine is less than the battery state of charge limit of the second stopped engine.
In the embodiment of the application, the vehicle speed limit value for starting the engine and the vehicle speed limit value for stopping the engine are adjusted in real time according to the average vehicle speed and the current battery state of charge. The method has the advantages that the start-stop control strategy based on the conditions of the vehicle speed and the battery electric quantity is realized, when the average vehicle speed is low and the battery charge state at the current moment is low, the vehicle speed limit value for starting the engine is reduced, the start-up is advanced, the vehicle speed limit value for stopping the engine is reduced, the shutdown is delayed, and the battery electric quantity is maintained at a high level, so that the battery electric quantity is prevented from being consumed all the time under the congestion working condition, and the problems of long-time low-efficiency operation and high oil consumption of a low-speed engine are solved. In the embodiment of the application, when the average vehicle speed is low, the battery state of charge limit value of the first starting engine is increased, and the battery energy reserve of a low-speed area is increased; when the average vehicle speed is higher, the battery state of charge limit value of the first starting engine is reduced, the use range of high-speed pure electricity is expanded, and the battery is more fully utilized; when the average vehicle speed is low, the battery state of charge limit value of the first stopped engine is increased, and frequent starting and stopping are avoided; when the average vehicle speed is higher, the battery state of charge limit of the first stopped engine is reduced, the shutdown is easier to realize, and the low-speed charging is avoided.
S103, determining the engine state at the current moment, wherein the engine state at the current moment comprises the running and stopping of the engine;
s104, judging whether the engine state at the current moment is the engine stop, if so, turning to S105, and if not, turning to S106;
s105, controlling the engine to start according to the vehicle speed limit value for starting the engine, the battery state of charge limit value set for starting the engine, the vehicle speed at the current moment and the battery state of charge at the current moment, wherein the method specifically comprises the following steps:
if the vehicle speed at the current moment is higher than the vehicle speed limit value of the starting engine and the battery charge state at the current moment is lower than the battery charge state limit value of the first starting engine, controlling the engine state to be the starting of the engine;
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the starting engine and the battery charge state at the current moment is lower than the battery charge state limit value of a second lower starting engine, controlling the engine state to be the engine starting;
s106, controlling the engine to stop according to the vehicle speed limit value of the stopped engine, the vehicle speed of the battery state of charge limit value set at the current moment of the stopped engine and the battery state of charge at the current moment, wherein the method specifically comprises the following steps:
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the stopped engine and the battery charge state at the current moment is higher than the battery charge state limit value of the first stopped engine, controlling the engine to stop;
and if the vehicle speed at the current moment is higher than the vehicle speed limit value of the stopped engine and the battery state of charge at the current moment is higher than the battery state of charge limit value of a second higher stopped engine, controlling the engine state to be the engine stop.
In the embodiment of the present application, the method further includes:
acquiring the battery charge state at the engine starting moment and the average vehicle speed of a period of time before the engine starting moment;
the target state of charge of the battery is adjusted according to the state of charge of the battery at the engine starting time and the average vehicle speed of a period of time before the engine starting time.
According to the method and the device, the target state of charge (which can be understood as the target electric quantity) of the battery can be adjusted in real time according to the state of charge of the battery at the engine starting moment and the average vehicle speed of a period of time before the engine starting moment, and the state of charge level of the battery is reasonably adjusted, so that the direct driving of the engine at the suburb road section is realized, and the oil consumption is reduced.
In the embodiment of the application, when the vehicle is judged to be in urban working condition to run according to the average speed, the target electric quantity of the battery is set to be high, and the battery is charged as much as possible in the running state of the engine to prepare for the subsequent congestion working condition; when the smooth working conditions such as the condition that the vehicle is in the suburb state and the like are judged according to the average vehicle speed, the target electric quantity of the battery can be properly reduced in real time according to the average vehicle speed as long as the electric quantity of the battery is in a reasonable level, the battery does not need to be charged by the engine for a long time, the vehicle can be directly driven by the engine under more conditions, and the vehicle can run purely at the starting or low speed, so that the problem that the fuel consumption is higher under the working conditions of more suburb walking and parking or the fuel consumption is higher in a short-distance mileage can be solved; when the vehicle is judged to be in a high-speed working condition according to the average vehicle speed, the efficiency of the motor is higher, and in order to store more energy, the target electric quantity of the battery is increased according to the average vehicle speed and is set to be a high level.
In the prior art, a vehicle speed-based start-stop management strategy generally sets a fixed vehicle speed limit value to realize start-stop control of an engine, the vehicle speed is higher than an upper limit value to request starting of the engine, and the vehicle speed is lower than a lower limit value to request stopping of the engine; the start-stop management strategy based on the state of charge of the battery generally sets a fixed battery state of charge limit value to realize the start-stop control of the engine, the state of charge of the battery is lower than the lower limit value of the state of charge to request the start of the engine, and the state of charge of the battery is higher than the upper limit value to request the stop of the engine. And (3) energy management strategy: under engine operating conditions, the engine may charge the battery until the battery is fully charged.
The prior art has the problems that when the vehicle runs under a congestion working condition for a long time, the electric quantity of a battery can drop all the time due to the fact that a starting vehicle speed threshold cannot be reached until an idling working condition occurs, the engine efficiency is low, the motor charging efficiency is low, the oil consumption is high, and the NVH problem can be caused; aiming at the current suburb working condition or the working condition that the vehicle is frequently stopped, the motor is frequently used for starting, high-power discharging is carried out, and then the engine is used for charging, so that the efficiency of charging and discharging is not high, and the oil consumption is higher; secondly, for a short-distance travel client in suburban driving, the engine may be charged in the whole process, and the oil consumption is higher;
in summary, the method for reducing the fuel consumption of the hybrid electric vehicle provided by the embodiment of the application can effectively solve the above problems, the method for reducing the fuel consumption of the hybrid electric vehicle provided by the embodiment of the application can judge the driving state of the vehicle according to the average vehicle speed at the historical moment and the battery charge state of the battery at the current moment, and different start-stop strategies and energy management strategies are adopted according to different road conditions in which the vehicle is located, so that the problem of high fuel consumption caused by starting the engine to charge due to low electric quantity can be effectively solved, and the problem of high fuel consumption in short distance under suburban conditions can be effectively solved.
The following describes a specific embodiment of a method for reducing oil consumption of a hybrid electric vehicle according to the present application, and fig. 2 is a schematic flow chart of the method for reducing oil consumption of a hybrid electric vehicle according to the present application, including:
s201, acquiring the average vehicle speed at the historical moment, the vehicle speed at the current moment and the battery charge state at the current moment;
s202, acquiring a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical moment and the battery charge state at the current moment; acquiring a battery state of charge limit value of a first started engine, a battery state of charge limit value of a second started engine, a battery state of charge limit value of a first stopped engine and a battery state of charge limit value of a second stopped engine according to the average speed at the historical moment;
s203, determining the engine state at the current moment;
s204, judging whether the engine state at the current moment is the engine stop, if so, turning to S205, and if not, turning to S206;
s205, judging whether the vehicle speed at the current moment is higher than the vehicle speed limit value for starting the engine, if so, turning to S207, and if not, turning to S208;
s206, judging whether the vehicle speed at the current moment is lower than the vehicle speed limit value of the stopped engine, if so, turning to S209, otherwise, turning to S210;
s207, judging whether the battery charge state is lower than a battery charge state limit value of a first starting engine, if so, turning to 211, and if not, turning to S212;
s208, judging whether the battery charge state is lower than the battery charge state limit value of the second starting engine, if so, turning to 211, and if not, turning to S212;
s209: determining whether the battery state of charge is greater than a first stopped engine battery state of charge limit, if so, proceeding to 213, otherwise, proceeding to S214;
s210, judging whether the battery charge state is higher than a battery charge state limit value of a second stop engine, if so, turning to 213, and if not, turning to S214;
s211, controlling the engine to start;
s212: keeping the engine stopped;
s213: controlling the engine to stop;
s214: keeping the engine running;
in the embodiment of the present application, the method further includes:
acquiring the battery charge state at the engine starting moment and the average vehicle speed of a period of time before the engine starting moment;
the target state of charge of the battery is adjusted according to the state of charge of the battery at the engine starting time and the average vehicle speed of a period of time before the engine starting time.
In a second aspect of the embodiment of the present application, a device 300 for reducing fuel consumption of a hybrid vehicle is provided, and fig. 3 is a schematic structural diagram of the device for reducing fuel consumption of a hybrid vehicle according to the embodiment of the present application, including:
the acquiring module 301 is configured to acquire an average vehicle speed at a historical time, a vehicle speed at a current time, and a battery state of charge at the current time;
the acquisition module 301 is configured to acquire a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical time and the battery state of charge at the current time; acquiring a battery state of charge limit set for starting the engine and a battery state of charge limit set for stopping the engine according to the average vehicle speed;
a determination module 302, the determination module 302 configured to determine an engine state at a current time, the engine state at the current time including engine operation and engine stop;
the engine start-stop control module 303 is configured to control the engine to start according to a vehicle speed limit for starting the engine, a battery state of charge limit set for starting the engine, a vehicle speed at the current moment, and a battery state of charge at the current moment, if the engine state at the current moment is that the engine is stopped; the method specifically comprises the following steps:
if the vehicle speed at the current moment is higher than the vehicle speed limit value of the starting engine and the battery charge state is lower than the battery charge state limit value of the first starting engine, controlling the starting of the engine;
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the starting engine and the battery charge state is lower than the battery charge state limit value of a second starting engine, controlling the starting of the engine;
the engine start-stop control module 303 is configured to control the engine to stop according to a vehicle speed limit for stopping the engine, a battery state of charge limit for stopping the engine, a vehicle speed at the current time, and a battery state of charge at the current time if the engine state at the current time is the engine running; the method comprises the following steps:
if the vehicle speed at the current moment is lower than the vehicle speed limit value for stopping the engine and the battery charge state is higher than the battery charge state limit value for first stopping the engine, controlling the engine to stop;
or;
and controlling the engine to stop if the vehicle speed at the current moment is higher than the vehicle speed limit value for stopping the engine and the battery state of charge is higher than the battery state of charge limit value for second stopping the engine.
In the embodiment of the application, the battery state of charge limit set of the starting engine comprises a battery state of charge limit of a first starting engine and a battery state of charge limit of a second starting engine;
the set of battery state of charge limits to stop the engine includes a first stopped engine battery state of charge limit and a second stopped engine battery state of charge limit.
The battery state of charge limit of the second starting engine is smaller than the battery state of charge limit of the first starting engine; the battery state of charge limit of the first stopped engine is less than the battery state of charge limit of the second stopped engine.
In the embodiment of the present application, fig. 4 is a schematic diagram of a device for reducing oil consumption of a hybrid electric vehicle according to the embodiment of the present application, where an obtaining module 301 in the device is further configured to obtain a battery state of charge at an engine starting time and an average vehicle speed of a previous period of time at the engine starting time;
the device also includes: the energy management module 304 is configured to adjust the target electric quantity of the battery according to the battery state of charge at the engine start time and an average vehicle speed of a period of time before the engine start time.
The device for reducing the oil consumption of the hybrid electric vehicle can judge the running state of the vehicle according to the average vehicle speed at the historical moment and the battery charge state of the battery at the current moment, adopts different start-stop strategies and energy management strategies according to different road conditions where the vehicle is located, can effectively solve the problem that the oil consumption is higher due to the fact that the engine is started to charge with lower electric quantity, and effectively solves the problem that the short-distance oil consumption is higher under suburban working conditions.
A third aspect of the embodiments of the present application provides an electronic device, where the electronic device includes a processor and a memory, where the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement a method for reducing fuel consumption of a hybrid vehicle.
A fourth aspect of the embodiments of the present application provides a computer storage medium, where at least one instruction or at least one program is stored in the storage medium, and the at least one instruction or the at least one program is loaded and executed by a processor to implement a method for reducing fuel consumption of a hybrid vehicle.
Optionally, in this embodiment of the present application, the storage medium may be located in at least one network server of a plurality of network servers of a computer network. Optionally, in this embodiment, the storage medium may include, but is not limited to: a U disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
It should be noted that: the sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (10)

1. A method for reducing oil consumption of a hybrid electric vehicle is characterized by comprising the following steps:
acquiring the average vehicle speed at the historical moment, the vehicle speed at the current moment and the battery charge state at the current moment; the historical time is a preset historical time period before the current time;
acquiring a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical moment and the battery charge state at the current moment; acquiring a battery state of charge limit set for starting the engine and a battery state of charge limit set for stopping the engine according to the average speed at the historical moment;
determining an engine state at a current time, the engine state at the current time comprising engine operation and engine stop;
if the engine state at the current moment is engine stop, controlling the engine to start according to the vehicle speed limit value of the started engine, the battery state of charge limit value set of the started engine, the vehicle speed at the current moment and the battery state of charge at the current moment;
or;
and if the engine state at the current moment is the engine running state, controlling the engine to stop according to the vehicle speed limit value of the stopped engine and the battery charge state limit value of the stopped engine, and integrating the vehicle speed at the current moment and the battery charge state at the current moment.
2. The method for reducing fuel consumption of a hybrid vehicle of claim 1, wherein the set of battery state of charge limits for the starting engines comprises a first starting engine battery state of charge limit and a second starting engine battery state of charge limit;
the set of stopped engine battery state of charge limits comprises a first stopped engine battery state of charge limit and a second stopped engine battery state of charge limit;
the battery state of charge limit of the second starting engine is smaller than the battery state of charge limit of the first starting engine; the battery state of charge limit of the first stopped engine is less than the battery state of charge limit of the second stopped engine.
3. The method for reducing the fuel consumption of the hybrid electric vehicle according to claim 2, wherein the engine is controlled to start according to the vehicle speed limit of the starting engine, the battery state of charge limit set of the starting engine, the vehicle speed at the current moment and the battery state of charge at the current moment; the method comprises the following steps:
if the vehicle speed at the current moment is higher than the vehicle speed limit value of the starting engine and the battery SOC at the current moment is lower than the battery SOC limit value of the first starting engine, controlling the starting of the engine;
or;
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the starting engine and the battery charge state at the current moment is lower than the battery charge state limit value of the second starting engine, controlling the starting of the engine;
the controlling the engine to stop according to the vehicle speed limit value of the stopped engine, the battery state of charge limit value of the stopped engine, the vehicle speed at the current moment and the battery state of charge at the current moment comprises the following steps:
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the stopped engine and the battery SOC at the current moment is higher than the battery SOC limit value of the first stopped engine, controlling the engine to stop;
or;
and if the vehicle speed at the current moment is higher than the vehicle speed limit value of the stopped engine and the battery SOC at the current moment is higher than the battery SOC limit value of the second stopped engine, controlling the engine to stop.
4. The method for reducing fuel consumption of a hybrid vehicle according to claim 1, further comprising:
acquiring the battery charge state at the engine starting moment and the average vehicle speed of a period of time before the engine starting moment;
and adjusting the target state of charge of the battery according to the battery state of charge at the engine starting moment and the average vehicle speed of a period of time before the engine starting moment.
5. A device for reducing oil consumption of a hybrid electric vehicle is characterized by comprising:
the acquisition module is used for acquiring the average vehicle speed at the historical moment, the vehicle speed at the current moment and the battery charge state at the current moment; the historical time is a preset historical time period before the current time;
the acquisition module is used for acquiring a vehicle speed limit value for starting the engine and a vehicle speed limit value for stopping the engine according to the average vehicle speed at the historical moment and the battery charge state at the current moment; acquiring a battery state of charge limit set for starting the engine and a battery state of charge limit set for stopping the engine according to the average vehicle speed;
a determination module to determine an engine state at a current time, the engine state at the current time comprising engine operation and engine stop;
the engine start-stop control module is used for controlling the engine to start according to the vehicle speed limit value of the started engine, the battery state of charge limit value set of the started engine, the vehicle speed at the current moment and the battery state of charge at the current moment if the engine state at the current moment is the engine stop;
or;
and the engine start-stop control module is used for integrating the vehicle speed at the current moment and the battery state of charge at the current moment according to the vehicle speed limit value of the stopped engine and the battery state of charge limit value of the stopped engine to control the engine to stop if the engine state at the current moment is the engine running state.
6. The apparatus for reducing fuel consumption of a hybrid vehicle of claim 5, wherein the set of battery state of charge limits for the starting engines comprises a first starting engine battery state of charge limit and a second starting engine battery state of charge limit;
the set of stopped engine battery state of charge limits comprises a first stopped engine battery state of charge limit and a second stopped engine battery state of charge limit;
the battery state of charge limit of the second starting engine is smaller than the battery state of charge limit of the first starting engine; the battery state of charge limit of the first stopped engine is less than the battery state of charge limit of the second stopped engine.
7. The device for reducing fuel consumption of a hybrid electric vehicle according to claim 6, wherein the controlling of the engine start according to the vehicle speed limit of the starting engine, the battery state of charge limit set of the starting engine, the vehicle speed at the current moment and the battery state of charge at the current moment comprises:
if the vehicle speed at the current moment is higher than the vehicle speed limit value of the starting engine and the battery SOC at the current moment is lower than the battery SOC limit value of the first starting engine, controlling the starting of the engine;
or;
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the starting engine and the battery charge state at the current moment is lower than the battery charge state limit value of the second starting engine, controlling the starting of the engine;
the controlling the engine to stop according to the vehicle speed limit value of the stopped engine, the battery state of charge limit value set of the stopped engine, the vehicle speed at the current moment and the battery state of charge at the current moment comprises the following steps:
if the vehicle speed at the current moment is lower than the vehicle speed limit value of the stopped engine and the battery SOC at the current moment is higher than the battery SOC limit value of the first stopped engine, controlling the engine to stop;
or;
and if the vehicle speed at the current moment is higher than the vehicle speed limit value of the stopped engine and the battery SOC at the current moment is higher than the battery SOC limit value of the second stopped engine, controlling the engine to stop.
8. The device for reducing the fuel consumption of the hybrid vehicle according to claim 5,
the acquisition module is also used for acquiring the battery charge state at the engine starting moment and the average vehicle speed of a period of time before the engine starting moment;
the device further comprises:
an energy management module; and the energy management module is used for adjusting the target state of charge of the battery according to the state of charge of the battery at the engine starting moment and the average speed of the battery in the period of time before the engine starting moment.
9. An electronic device, comprising a processor and a memory, wherein at least one instruction, at least one program, a code set, or a set of instructions is stored in the memory, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by the processor to implement the method for reducing fuel consumption of a hybrid vehicle according to any one of claims 1 to 4.
10. A computer storage medium, wherein at least one instruction or at least one program is stored in the storage medium, and the at least one instruction or the at least one program is loaded and executed by a processor to implement the method for reducing fuel consumption of a hybrid vehicle according to any one of claims 1 to 4.
CN202010552632.4A 2020-06-17 2020-06-17 Method and device for reducing fuel consumption of hybrid electric vehicle, electronic equipment and storage medium Active CN111852713B (en)

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