CN112477607B - Braking energy recovery control method and system and vehicle - Google Patents
Braking energy recovery control method and system and vehicle Download PDFInfo
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- CN112477607B CN112477607B CN202011357957.3A CN202011357957A CN112477607B CN 112477607 B CN112477607 B CN 112477607B CN 202011357957 A CN202011357957 A CN 202011357957A CN 112477607 B CN112477607 B CN 112477607B
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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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- 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
- B60L7/18—Controlling the braking effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18109—Braking
- B60W30/18127—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
- Y02T10/72—Electric energy management in electromobility
Abstract
The invention discloses a braking energy recovery control method, a braking energy recovery control system and a vehicle, wherein the method comprises the following steps: when the vehicle is in a target working condition, acquiring working state information of the vehicle; determining a target recovery torque of the motor according to a target deceleration of the vehicle; calculating first power of the motor according to the target recovery torque of the motor and the rotating speed of the motor; when the battery recovery power is not greater than the first power, determining a second working efficiency of the motor according to the battery recovery power and the first power of the motor, and controlling the motor to work according to the second working efficiency; wherein the first operating efficiency is greater than the second operating efficiency; the invention reduces the generating efficiency of the motor, adjusts the proportion of converting the mechanical power of the motor into electric energy and heat energy, greatly reduces the electric energy converted from the same mechanical energy, absorbs the residual mechanical energy from the environment by low-quality heat energy, and can still meet the deceleration requirement of the whole vehicle even if limited by the recovery power of the battery.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a braking energy recovery control method, a braking energy recovery control system and an automobile.
Background
With the technical development of new energy automobiles, the yield and the preservation quantity of the new energy automobiles increase year by year, and compared with the traditional fuel oil automobiles, the new energy automobiles can convert kinetic energy generated when the automobiles run into mechanical energy of a motor due to the existence of the motor and a power battery, and further convert the mechanical energy into electric energy through electromagnetic induction to be stored in the power battery, namely energy recovery. The main mechanisms involved in energy recovery are a motor and a power battery, and the motor has certain efficiency during actual working, and part of mechanical energy is released to the environment in a heat energy form and cannot be utilized, so that the motor is enabled to work in a high-efficiency interval as far as possible in the aspect of control of the motor at present, so that heat loss is reduced, and energy utilization efficiency is improved.
Because a part of kinetic energy is converted into electric energy and heat energy, the vehicle speed is bound to be reduced along with the proceeding of energy recovery, so in the aspect of dynamic performance, the whole vehicle has a certain energy recovery deceleration, and the higher the mechanical power of the motor is, the higher the recovery deceleration is. Generally, in order to ensure the drivability of the vehicle, at a certain vehicle speed, the deceleration provided by energy recovery is a fixed value, and the energy recovery power is limited by the allowable charging power of the power battery, so when the allowable charging power of the power battery is limited (under the conditions of full charge, over-temperature and the like of the battery), the deceleration provided by energy recovery is greatly reduced, and the deceleration requirement expected by the driver cannot be met, thereby causing accidents such as collision and the like. In addition, for a long downhill working condition, if the brake system is used for a long time to keep the vehicle speed stable, the risk of overheat damage of the brake system exists, the traditional vehicle can compensate the braking force by using the drag resistance of an engine, and when the charging power allowed by a power battery of the pure electric vehicle is limited, partial braking force cannot be compensated through energy recovery, the vehicle speed stability is kept only by the brake system, and the situations of overheat damage, excessive wear and the like of the brake disc can be caused.
Based on the disadvantages of the prior art, there is an urgent need to develop a braking energy recovery control method, system and vehicle to solve the above problems.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a braking energy recovery control method, a braking energy recovery control system and a vehicle, and the braking energy recovery control method, the braking energy recovery control system and the vehicle can ensure that the deceleration provided by motor recovery can always meet the expectation of a driver when the recovery power of a battery is limited: when the battery recovery power is smaller than the first power of the motor, the distribution proportion of the mechanical power of the motor converted into the electric energy and the heat energy is adjusted by reducing the generating efficiency of the motor, so that the electric energy converted from the same mechanical energy is greatly reduced, and the residual mechanical energy is absorbed by the environment by the low-quality heat energy. Therefore, even if the limit of the recovered power of the battery is met, the deceleration requirement of the whole vehicle can be met.
The invention discloses a braking energy recovery control method, which comprises the following steps:
judging whether the vehicle is in a target working condition or not;
when the vehicle is in a target working condition, acquiring working state information of the vehicle; the working state information comprises battery recovered power, the rotating speed of the motor, the target deceleration of the vehicle and first working efficiency of the motor; determining a target recovery torque of the motor according to a target deceleration of the vehicle;
calculating first power of the motor according to the target recovery torque of the motor and the rotating speed of the motor;
comparing the first power and the battery recovered power;
when the recovered power of the battery is greater than the first power, controlling the motor to work according to the first working efficiency;
when the battery recovery power is not greater than the first power, determining a second working efficiency of the motor according to the battery recovery power and the first power of the motor, and controlling the motor to work according to the second working efficiency; wherein the first operating efficiency is greater than the second operating efficiency.
Further, before determining whether the vehicle is in the target operating condition, the method further includes:
acquiring running state information of a vehicle;
judging whether the running state information meets a preset condition or not according to the running state information;
if the running state information meets the preset condition, determining that the vehicle is in a target working condition;
if the state information does not meet the preset condition, determining that the vehicle is not in a target working condition; wherein the target working condition is a coasting working condition.
Further, the running state information comprises the vehicle speed of the vehicle, the opening degree of an accelerator pedal, the opening degree of a brake pedal and gear information;
the judging whether the running state information meets preset conditions or not according to the running state information comprises the following steps:
judging whether the vehicle speed, the accelerator pedal opening, the brake pedal opening and the gear information of the vehicle meet the preset conditions, wherein the preset conditions are that the vehicle speed of the vehicle is not less than a preset vehicle speed value, the accelerator pedal opening is not less than a first preset value, the brake pedal opening is not less than a second preset value and the gear is in a D/R gear;
if the vehicle speed, the opening degree of the accelerator pedal, the opening degree of the brake pedal and the gear information of the vehicle meet the preset conditions, the vehicle is judged to be in the target working condition;
and if the vehicle speed, the opening degree of the accelerator pedal, the opening degree of the brake pedal and the gear information of the vehicle do not meet the preset conditions, judging that the vehicle is not in the target working condition.
Further, the determining a target recovery torque of the motor based on the target deceleration of the vehicle includes:
determining a target recovery torque of the motor according to the target deceleration of the vehicle and a first data table; wherein the first data table is used for recording a mapping relation between a target deceleration of the vehicle and a target recovery torque of the motor.
Further, when the recovered battery power is greater than the first power, controlling the motor to operate according to a first operating efficiency includes:
when the recovered battery power is larger than the first power, determining that the motor is only used for converting mechanical energy into electric energy to charge a battery; wherein the battery recovery power is the maximum recovery power of the battery;
according to the first working efficiency, controlling a motor to convert mechanical energy into electric energy to charge a battery; wherein the first operating efficiency is a maximum efficiency.
Further, the determining the second operating efficiency of the motor according to the recovered power of the battery and the first power of the motor comprises:
determining a second working efficiency of the motor according to the ratio of the recovered power of the battery to the first power; wherein the second working efficiency is an efficiency of converting mechanical energy into electric energy by the motor.
Further, when the recovered battery power is not greater than the first power, obtaining a second working efficiency of the motor according to the recovered battery power and the first power of the motor, and controlling the motor to work according to the second working efficiency includes:
when the battery recovery power is not larger than the first power, determining that the motor is used for converting mechanical energy into electric energy to charge the battery and converting the mechanical energy into heat energy;
calculating a third working efficiency according to the difference value of the first working efficiency and the second working efficiency;
according to the third working efficiency, controlling a motor to convert mechanical energy into heat energy;
and controlling the motor to convert the mechanical energy into electric energy to charge the battery according to the second working efficiency.
Further, the controlling the motor to operate according to the second operating efficiency includes:
determining a first torque required by the motor for converting mechanical energy into electric energy according to the second working efficiency;
determining a target current of the motor according to the first torque and a second data table; the second data table is used for recording a mapping relation between the first torque and a target current of the motor;
and controlling the motor to work at the second working efficiency according to the target current.
The present invention also provides a braking energy recovery control system, the system comprising:
the determining module is used for determining that the vehicle is in a target working condition;
the acquisition module is used for acquiring the working state information of the vehicle; the working state information comprises battery recovered power, the rotating speed of the motor, the target deceleration of the vehicle and first working efficiency of the motor;
the calculation module is used for determining a target recovery torque of the motor according to the target deceleration of the vehicle and calculating first power of the motor according to the target recovery torque of the motor and the rotating speed of the motor;
the judging module is used for comparing the first power with the battery recovery power;
the control module is used for controlling the motor to work according to the first working efficiency when the recovered power of the battery is greater than the first power; when the battery recovery power is not greater than the first power, determining a second working efficiency of the motor according to the battery recovery power and the first power of the motor, and controlling the motor to work according to the second working efficiency; wherein the first operating efficiency is greater than the second operating efficiency.
The invention also provides a vehicle which is provided with the braking energy recovery control system.
The embodiment of the invention has the following beneficial effects:
the invention can ensure that the deceleration provided by motor recovery can always meet the expectation of a driver when the recovery power of the battery is limited: when the battery recovery power is smaller than the first power of the motor, the distribution proportion of the mechanical power of the motor converted into the electric energy and the heat energy is adjusted by reducing the generating efficiency of the motor, so that the electric energy converted from the same mechanical energy is greatly reduced, and the residual mechanical energy is absorbed by the environment by the low-quality heat energy. Therefore, even if the battery recovery power is limited, the deceleration requirement of the whole vehicle can be met.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can also be derived from them without inventive effort.
FIG. 1 is a flow chart of a braking energy recovery control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a braking energy recovery control system according to an embodiment of the present invention.
Wherein the reference numerals in the figures correspond to:
1-a determination module; 2-an acquisition module; 3-a calculation module; 4-a judging module; and 5, a control module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above 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 invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The engine control system described in the prior art has the following disadvantages: in order to ensure the drivability of the vehicle, at a certain vehicle speed, the deceleration provided by energy recovery is a fixed value, and the energy recovery power is limited by the allowable charging power of the power battery, so when the allowable charging power of the power battery is limited (under the working conditions of full charge, over-temperature and the like of the battery), the deceleration provided by energy recovery is greatly reduced, the deceleration requirement expected by the driver cannot be met, and further accidents such as collision and the like occur. In addition, for a long downhill working condition, if the brake system is used for a long time to keep the vehicle speed stable, the risk of overheat damage of the brake system exists, the traditional vehicle can compensate the braking force by using the drag resistance of an engine, and when the charging power allowed by a power battery of the pure electric vehicle is limited, partial braking force cannot be compensated through energy recovery, the vehicle speed stability is kept only by the brake system, and the situations of overheat damage, excessive wear and the like of the brake disc can be caused.
In view of the defects in the prior art, the embodiment of the invention provides a braking energy recovery control method, which can ensure that the deceleration provided by motor recovery always meets the driver expectation when the battery recovery power is limited: when the battery recovery power is smaller than the first power of the motor, the distribution proportion of the mechanical power of the motor converted into the electric energy and the heat energy is adjusted by reducing the generating efficiency of the motor, so that the electric energy converted from the same mechanical energy is greatly reduced, and the residual mechanical energy is absorbed by the environment by the low-quality heat energy. Therefore, even if the battery recovery power is limited, the deceleration requirement of the whole vehicle can be met.
Referring to fig. 1 to 2, the present embodiment provides a braking energy recovery control method, including the steps of:
s1: judging whether the vehicle is in a target working condition or not;
s2: when the vehicle is in a target working condition, acquiring working state information of the vehicle; the working state information comprises battery recovered power, the rotating speed of the motor, the target deceleration of the vehicle and first working efficiency of the motor; determining a target recovery torque of the motor according to a target deceleration of the vehicle;
s3: calculating first power of the motor according to the target recovery torque of the motor and the rotating speed of the motor;
s4: comparing the first power and the battery recovered power;
s5: when the recovered power of the battery is greater than the first power, controlling the motor to work according to the first working efficiency;
s6: when the battery recovery power is not greater than the first power, determining a second working efficiency of the motor according to the battery recovery power and the first power of the motor, and controlling the motor to work according to the second working efficiency; wherein the first operating efficiency is greater than the second operating efficiency.
It should be noted that: the first working efficiency and the second working efficiency are both the generating power of the motor; when the system is in a target working condition, the invention can ensure that the deceleration provided by motor recovery can always meet the expectation of a driver when the recovery power of the battery is limited: when the battery recovery power is smaller than the first power of the motor, the distribution proportion of the mechanical power of the motor converted into the electric energy and the heat energy is adjusted by reducing the generating efficiency of the motor, so that the electric energy converted from the same mechanical energy is greatly reduced, and the residual mechanical energy is absorbed by the environment by the low-quality heat energy. Therefore, even if the battery recovery power is limited, the deceleration requirement of the whole vehicle can be met.
It should also be noted that: the first working efficiency is the maximum power generation efficiency of the motor, but the first working efficiency is not 100% due to energy loss, so a third data table is also required to be preset, and the third data table is used for recording the running state of the vehicle and the maximum power generation efficiency of the motor in the running state; the running state of the vehicle can be determined according to the speed of the vehicle, the rotating speed of the motor and the like;
the second operating efficiency is a maximum power generation efficiency allocated according to the battery recovery power.
Preferably, before determining whether the vehicle is in the target operating condition, the method further includes:
acquiring running state information of a vehicle;
judging whether the running state information meets a preset condition or not according to the running state information;
if the running state information meets the preset condition, determining that the vehicle is in a target working condition;
if the state information does not meet the preset condition, determining that the vehicle is not in a target working condition; wherein the target working condition is a coasting working condition.
Preferably, the running state information includes vehicle speed of the vehicle, opening degree of an accelerator pedal, opening degree of a brake pedal, and shift position information;
the judging whether the running state information meets preset conditions or not according to the running state information comprises the following steps:
judging whether the vehicle speed, the accelerator pedal opening, the brake pedal opening and the gear information of the vehicle meet the preset conditions, wherein the preset conditions are that the vehicle speed of the vehicle is not less than a preset vehicle speed value, the accelerator pedal opening is not less than a first preset value, the brake pedal opening is not less than a second preset value and the gear is in a D/R gear;
if the vehicle speed, the opening degree of the accelerator pedal, the opening degree of the brake pedal and the gear information of the vehicle meet the preset conditions, the vehicle is judged to be in the target working condition;
and if the vehicle speed, the opening degree of the accelerator pedal, the opening degree of the brake pedal and the gear information of the vehicle do not meet the preset conditions, judging that the vehicle is not in the target working condition.
Specifically, when the vehicle meets a preset condition, the vehicle is judged to be in a sliding working condition; when the vehicle is in a sliding working condition, the proportion of converting the mechanical power of the motor into the electric energy and the heat energy is distributed, so that the limitation of the recovery power of the battery is avoided, and the vehicle can meet the deceleration requirement.
Preferably, the determining the target recovery torque of the motor based on the target deceleration of the vehicle includes:
determining a target recovery torque of the motor according to the target deceleration of the vehicle and a first data table; wherein the first data table is used for recording a mapping relation between a target deceleration of the vehicle and a target recovery torque of the motor.
Specifically, the first data table is calibrated in advance according to the target deceleration of the vehicle and the target recovery torque of the motor, and the target recovery torque of the motor can be determined on the premise that the target deceleration of the vehicle is known.
Preferably, when the recovered battery power is greater than the first power, controlling the motor to operate according to a first operating efficiency includes:
when the recovered battery power is larger than the first power, determining that the motor is only used for converting mechanical energy into electric energy to charge a battery; wherein the battery recovery power is the maximum recovery power of the battery;
according to the first working efficiency, controlling a motor to convert mechanical energy into electric energy to charge a battery; wherein the first operating efficiency is a maximum efficiency.
Specifically, the first power is mechanical power of the motor; when the recovered power of the battery is larger than the mechanical power of the motor, the mechanical power of the motor can be completely converted into the electric energy of the battery; the electric machine converts mechanical energy into electrical energy at its maximum efficiency to charge the battery.
Preferably, the determining the second operating efficiency of the motor based on the recovered battery power and the first power of the motor comprises:
determining a second working efficiency of the motor according to the ratio of the recovered power of the battery to the first power; wherein the second working efficiency is an efficiency of converting mechanical energy into electric energy by the motor.
Specifically, the ratio of the mechanical energy converted into the electric energy by the motor is determined according to the ratio of the recovered power of the battery to the first power.
Specifically, the second operating efficiency is 100% of the recovered power of the battery/the first power.
Preferably, when the recovered battery power is not greater than the first power, obtaining a second operating efficiency of the motor according to the recovered battery power and the first power of the motor, and controlling the motor to operate according to the second operating efficiency includes:
when the battery recovery power is not larger than the first power, determining that the motor is used for converting mechanical energy into electric energy to charge the battery and converting the mechanical energy into heat energy;
calculating a third working efficiency according to the difference value of the first working efficiency and the second working efficiency;
controlling a motor to convert mechanical energy into heat energy according to the third working efficiency;
and controlling the motor to convert the mechanical energy into electric energy to charge the battery according to the second working efficiency.
Specifically, when the battery recovered power is greater than the first power, determining that the motor can convert mechanical energy into electric energy at the maximum efficiency of the motor to charge a battery;
when the recovered power of the battery is not larger than the first power, the electric energy required by the battery is determined to be less than the electric energy converted by the motor at the maximum efficiency, and the mechanical energy of the motor cannot be fully used for charging the battery, otherwise, the battery is overcharged, and the service life of the battery is reduced.
Preferably, the controlling the motor to operate according to the second operating efficiency includes:
determining a first torque required by the motor for converting mechanical energy into electric energy according to the second working efficiency;
determining a target current of the motor according to the first torque and a second data table; the second data table is used for recording a mapping relation between the first torque and a target current of the motor;
and controlling the motor to work at the second working efficiency according to the target current.
Specifically, the second data table is calibrated in advance according to the first torque of the motor and the target current of the motor, the target current of the motor can be determined on the premise that the first torque of the motor is known, and the motor can be controlled to work at the second working efficiency based on the target current.
In some possible embodiments, when the battery recovery power of the vehicle is 80kw, the motor speed is 5000rpm and the target reduction of the vehicle is achievedWhen the speed is 0.2g, the target recovery torque-115 Nm of the motor can be obtained by inquiring a first data table or the target recovery torque of the motor can be calculated according to the battery recovery power of the vehicle, the rotating speed of the motor, the target deceleration of the vehicle and the like, and according to the formula:
calculating first power, wherein the first power is-60 Kw; wherein P is a first power and T is a target recovery torque of the motor; and judging the absolute values of the battery recovery power and the first power, wherein the battery recovery power is greater than the first power, and the mechanical energy of the motor is completely converted into electric energy to charge the battery.
When the battery recovery power is 20Kw and the first power is-60 Kw, judging the battery recovery power and the absolute value of the first power, wherein the battery recovery power is smaller than the first power, namely, the mechanical energy of the motor is partially converted into electric energy to charge the battery, and the other part is converted into heat energy; at this time, the second working efficiency can be calculated according to the battery recovered power and the first power, and the motor is controlled to generate power according to the second working efficiency.
In other embodiments, a preset value of the working efficiency of the motor can be set according to the first power of the motor and the battery recovery power, the working efficiency of the motor is controlled not to exceed the preset value, and then the distribution proportion of converting the mechanical power of the motor into electric energy and heat energy is adjusted, so that the limitation of the battery recovery power on the motor is avoided, and the deceleration requirement of the whole vehicle is still met.
Specifically, the heat energy generated by the motor is equal to the first power of the motor minus the generated power of the motor.
The present invention also provides a braking energy recovery control system, the system comprising:
the determining module 1 is used for determining that the vehicle is in a target working condition;
the acquisition module 2 is used for acquiring the working state information of the vehicle; the working state information comprises battery recovered power, the rotating speed of the motor, the target deceleration of the vehicle and first working efficiency of the motor;
the calculation module 3 is used for determining a target recovery torque of the motor according to the target deceleration of the vehicle and calculating a first power of the motor according to the target recovery torque of the motor and the rotating speed of the motor;
the judging module 4 is used for comparing the first power with the battery recovery power;
the control module 5 is used for controlling the motor to work according to the first working efficiency when the battery recovery power is larger than the first power; when the battery recovery power is not greater than the first power, determining a second working efficiency of the motor according to the battery recovery power and the first power of the motor, and controlling the motor to work according to the second working efficiency; wherein the first operating efficiency is greater than the second operating efficiency.
The invention also provides a vehicle which is provided with the braking energy recovery control system.
In some possible embodiments, the vehicle further comprises a controller and a detection device, the controller being electrically connected to the detection device; the detection device comprises a vehicle speed sensor, a deceleration sensor, an accelerator pedal sensor, a brake pedal sensor and the like; the vehicle speed sensor and the deceleration sensor are both arranged on the vehicle body, the accelerator pedal sensor is arranged on an accelerator pedal, and the brake pedal sensor is arranged on a brake pedal.
In some possible embodiments, the vehicle further comprises an alarm electrically connected to the controller, the alarm configured to: when the battery recovery power is greater than the first power, sending a first prompt message; when the battery recovery power is not greater than the first power, sending a second prompt message; the first prompt information is used for prompting a driver that the motor works at a first working efficiency, and mechanical energy of the motor is completely converted into electric energy to charge a battery at the moment; the second prompt information is used for prompting a driver that the motor works at a second working efficiency, at the moment, part of mechanical energy of the motor is converted into electric energy to charge the battery, and the other part of mechanical energy is converted into heat energy. The warning indicator can comprise a display screen or a voice prompt device, the first prompt message and the second prompt message can be voice prompt or image prompt, and the controller controls the warning indicator to send out the prompt messages mainly aiming at: the driver can timely make response operation according to the prompt information when necessary, and the safety of the driver in driving the vehicle is ensured.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.
Claims (10)
1. A braking energy recovery control method, characterized by comprising the steps of:
judging whether the vehicle is in a target working condition or not;
when the vehicle is in a target working condition, acquiring working state information of the vehicle; the working state information comprises battery recovered power, the rotating speed of the motor, the target deceleration of the vehicle and first working efficiency of the motor; determining a target recovery torque of the motor according to a target deceleration of the vehicle;
calculating first power of the motor according to the target recovery torque of the motor and the rotating speed of the motor;
comparing the first power and the battery recovered power;
when the recovered power of the battery is greater than the first power, controlling the motor to work according to the first working efficiency;
when the battery recovery power is not greater than the first power, determining a second working efficiency of the motor according to the battery recovery power and the first power of the motor, and controlling the motor to work according to the second working efficiency; wherein the first operating efficiency is greater than the second operating efficiency.
2. The brake energy recovery control method of claim 1, wherein the determining whether the vehicle is in the target operating condition further comprises:
acquiring running state information of a vehicle;
judging whether the running state information meets a preset condition or not according to the running state information;
if the running state information meets the preset condition, determining that the vehicle is in a target working condition;
if the running state information does not meet the preset condition, determining that the vehicle is not in a target working condition; wherein the target condition is a coasting condition.
3. A brake energy recovery control method according to claim 2, wherein the running state information includes a vehicle speed of the vehicle, an opening degree of an accelerator pedal, an opening degree of a brake pedal, and shift position information;
the judging whether the running state information meets preset conditions or not according to the running state information comprises the following steps:
judging whether the vehicle speed, the accelerator pedal opening, the brake pedal opening and the gear information of the vehicle meet the preset conditions, wherein the preset conditions are that the vehicle speed of the vehicle is not less than a preset vehicle speed value, the accelerator pedal opening is not less than a first preset value, the brake pedal opening is not less than a second preset value and the gear is in a D/R gear;
if the vehicle speed, the opening degree of the accelerator pedal, the opening degree of the brake pedal and the gear information of the vehicle meet the preset conditions, the vehicle is judged to be in the target working condition;
and if the vehicle speed, the opening degree of the accelerator pedal, the opening degree of the brake pedal and the gear information of the vehicle do not meet the preset conditions, judging that the vehicle is not in the target working condition.
4. A brake energy recovery control method according to claim 3, wherein the determining a target recovery torque of the motor based on a target deceleration of the vehicle includes:
determining a target recovery torque of the motor according to the target deceleration of the vehicle and a first data table; wherein the first data table is used for recording a mapping relation between a target deceleration of the vehicle and a target recovery torque of the motor.
5. The brake energy recovery control method of claim 4, wherein the controlling the motor to operate according to the first operating efficiency when the battery recovery power is greater than the first power includes:
when the recovered battery power is larger than the first power, determining that the motor is only used for converting mechanical energy into electric energy to charge a battery; wherein the battery recovery power is the maximum recovery power of the battery;
according to the first working efficiency, controlling a motor to convert mechanical energy into electric energy to charge a battery; wherein the first operating efficiency is a maximum efficiency.
6. The brake energy recovery control method of claim 5, wherein determining the second operating efficiency of the electric machine based on the recovered battery power and the first power of the electric machine comprises:
determining a second working efficiency of the motor according to the ratio of the recovered power of the battery to the first power; wherein the second working efficiency is an efficiency of converting mechanical energy into electric energy by the motor.
7. The brake energy recovery control method of claim 6, wherein when the recovered battery power is not greater than the first power, obtaining a second operating efficiency of the motor according to the recovered battery power and the first power of the motor, and controlling the motor to operate according to the second operating efficiency includes:
when the battery recovery power is not larger than the first power, determining that the motor is used for converting mechanical energy into electric energy to charge the battery and converting the mechanical energy into heat energy;
calculating a third working efficiency according to the difference value of the first working efficiency and the second working efficiency;
according to the third working efficiency, controlling a motor to convert mechanical energy into heat energy;
and controlling the motor to convert the mechanical energy into electric energy to charge the battery according to the second working efficiency.
8. The braking energy recovery control method according to claim 7, wherein the controlling of the motor operation according to the second operation efficiency includes:
determining a first torque required by the motor for converting mechanical energy into electric energy according to the second working efficiency;
determining a target current of the motor according to the first torque and a second data table; the second data table is used for recording a mapping relation between the first torque and a target current of the motor;
and controlling the motor to work at the second working efficiency according to the target current.
9. A braking energy recovery control system, the system comprising:
the determining module is used for determining that the vehicle is in a target working condition;
the acquisition module is used for acquiring the working state information of the vehicle; the working state information comprises battery recovered power, the rotating speed of the motor, the target deceleration of the vehicle and first working efficiency of the motor;
the calculation module is used for determining a target recovery torque of the motor according to the target deceleration of the vehicle and calculating a first power of the motor according to the target recovery torque of the motor and the rotating speed of the motor;
the judging module is used for comparing the first power with the battery recovery power;
the control module is used for controlling the motor to work according to the first working efficiency when the battery recovery power is larger than the first power; when the battery recovery power is not greater than the first power, determining a second working efficiency of the motor according to the battery recovery power and the first power of the motor, and controlling the motor to work according to the second working efficiency; wherein the first operating efficiency is greater than the second operating efficiency.
10. A vehicle characterized by being provided with a braking energy recovery control system as claimed in claim 9.
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| CN113263918B (en) * | 2021-06-30 | 2023-06-23 | 北京车和家信息技术有限公司 | Energy recovery control method and device |
| CN113479072B (en) * | 2021-07-14 | 2023-04-07 | 中国第一汽车股份有限公司 | Control method for improving drivability of electric vehicle under energy recovery working condition |
| CN113619398B (en) * | 2021-07-20 | 2023-06-02 | 岚图汽车科技有限公司 | Energy recovery method and device for electric vehicle, electric vehicle and storage medium |
| CN113958474B (en) * | 2021-09-30 | 2023-06-13 | 三一汽车起重机械有限公司 | Energy consumption method, device and working machine |
| CN116714443B (en) * | 2023-08-10 | 2024-01-23 | 宁德时代新能源科技股份有限公司 | Braking energy distribution method, system, device, equipment and medium |
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