CN112440999A - New energy vehicle and driving force correction method and device thereof - Google Patents

New energy vehicle and driving force correction method and device thereof Download PDF

Info

Publication number
CN112440999A
CN112440999A CN201910759400.3A CN201910759400A CN112440999A CN 112440999 A CN112440999 A CN 112440999A CN 201910759400 A CN201910759400 A CN 201910759400A CN 112440999 A CN112440999 A CN 112440999A
Authority
CN
China
Prior art keywords
current
vehicle
whole vehicle
resistance
driving force
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201910759400.3A
Other languages
Chinese (zh)
Other versions
CN112440999B (en
Inventor
赵宁
刘超凡
李殊予
张天奇
阎备战
张晓伟
王纪福
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhengzhou Yutong Bus Co Ltd
Original Assignee
Zhengzhou Yutong Bus Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhengzhou Yutong Bus Co Ltd filed Critical Zhengzhou Yutong Bus Co Ltd
Priority to CN201910759400.3A priority Critical patent/CN112440999B/en
Publication of CN112440999A publication Critical patent/CN112440999A/en
Application granted granted Critical
Publication of CN112440999B publication Critical patent/CN112440999B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • B60W40/105—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/12—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to parameters of the vehicle itself, e.g. tyre models
    • B60W40/13—Load or weight
    • 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
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal position
    • 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 provides a new energy vehicle and a driving force correction method and a driving force correction device thereof, wherein the method comprises the steps of firstly obtaining a first relation between the vehicle speed and the opening degree of an accelerator pedal under a standard working condition and the driving force of the whole vehicle, calculating the resistance of the whole vehicle under the standard working condition, and converting the first relation into a second relation between the vehicle speed and the opening degree of the accelerator pedal and the acceleration of the whole vehicle according to the obtained resistance of the whole vehicle; then, in the running process of the vehicle, the current resistance of the whole vehicle, the current quality of the whole vehicle, the current vehicle speed and the current opening degree of an accelerator pedal are obtained, and the current acceleration of the whole vehicle corresponding to the current vehicle speed and the current opening degree of the accelerator pedal is obtained according to a second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle. The invention dynamically adjusts the driving force of the whole vehicle by combining with the actual running condition, and improves the driving feeling of a driver.

Description

New energy vehicle and driving force correction method and device thereof
Technical Field
The invention belongs to the technical field of new energy vehicles, and particularly relates to a new energy vehicle and a driving force correction method and device thereof.
Background
Each new energy automobile has a fixed driver model before leaving the factory, called power MAP, which is a series of two-dimensional tables consisting of accelerator pedal opening and vehicle speed, the tables are shown in table 1 (the tables are relational tables of partial accelerator pedal opening, vehicle speed and vehicle driving force), namely, one accelerator pedal opening and one vehicle speed correspond to one vehicle driving force, and the tables show key indexes capable of reflecting the driving intention of the driver and the driving performance of the whole vehicle. The unit of the vehicle speed is km/h, the unit of the opening degree of an accelerator pedal is km/h, and the unit of the driving force of the whole vehicle is N.
TABLE 1
Figure BDA0002169795350000011
After the new energy automobile leaves a factory, the power MAP is basically fixed. However, in the driving process of the whole vehicle, the external environment changes greatly, such as a road surface changes, a wind speed changes and the like, if the external environment changes, a driver needs to correspondingly adjust the opening degree of an accelerator pedal to reach the original expected acceleration and speed, so that the requirement on the operation difficulty of the driver is high, and the driving feeling is poor; or the vehicle is suddenly replaced, the driver is likely to have no knowledge of the power MAP of the newly replaced vehicle, and in order to achieve the same driving force, the accelerator pedal of the replaced vehicle needs to be stepped on at a different opening degree from the accelerator pedal of the original vehicle, and at this time, if the accelerator pedal is stepped on too much, a safety accident is easily caused.
Disclosure of Invention
The invention provides a new energy vehicle driving force correction method, which is used for solving the problems of poor driving feeling or easy safety accidents caused by obtaining the driving force of a whole vehicle only according to power MAP; the invention also provides a new energy vehicle driving force correcting device, which is used for solving the problems of poor driving feeling or easy safety accidents caused by obtaining the whole vehicle driving force only according to the power MAP; the invention also provides a new energy vehicle, which is used for solving the problems of poor driving feeling or easy safety accidents caused by obtaining the driving force of the whole vehicle only according to the power MAP.
In order to solve the technical problems, the technical scheme and the beneficial effects of the invention are as follows:
the invention discloses a new energy vehicle driving force correction method, which comprises the following steps:
acquiring a first relation between the vehicle speed and the opening of an accelerator pedal under a standard working condition and the driving force of the whole vehicle, calculating the resistance of the whole vehicle under the standard working condition, and converting the first relation into a second relation between the vehicle speed and the opening of the accelerator pedal and the acceleration of the whole vehicle according to the obtained resistance of the whole vehicle; in the running process of the vehicle, acquiring the current resistance of the whole vehicle, the current quality of the whole vehicle, the current vehicle speed and the current opening degree of an accelerator pedal, and acquiring the current acceleration of the whole vehicle corresponding to the current vehicle speed and the current opening degree of the accelerator pedal according to the second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle.
The invention discloses a new energy vehicle driving force correcting device which comprises a memory and a processor, wherein a first relation between a vehicle speed, an accelerator pedal opening and a whole vehicle driving force under a standard working condition and a second relation between the vehicle speed, the accelerator pedal opening and a whole vehicle acceleration are stored in the memory, and the second relation is obtained by converting the first relation according to a whole vehicle resistance under the standard working condition; the memory further has instructions stored therein, and the processor is configured to execute the instructions stored in the memory to implement the method steps of:
in the running process of the vehicle, acquiring the current resistance of the whole vehicle, the current quality of the whole vehicle, the current vehicle speed and the current opening degree of an accelerator pedal, and acquiring the current acceleration of the whole vehicle corresponding to the current vehicle speed and the current opening degree of the accelerator pedal according to the second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle.
The invention discloses a new energy vehicle, which comprises an intelligent terminal, wherein a first relation between the vehicle speed, the opening degree of an accelerator pedal and the driving force of the whole vehicle under a standard working condition is stored in the intelligent terminal, the intelligent terminal is used for calculating the resistance of the whole vehicle under the standard working condition, and the first relation is converted into a second relation between the vehicle speed, the opening degree of the accelerator pedal and the acceleration of the whole vehicle according to the obtained resistance of the whole vehicle; acquiring the current resistance, the current quality, the current speed and the current opening degree of an accelerator pedal of the whole vehicle in the running process of the vehicle, and acquiring the current acceleration of the whole vehicle corresponding to the current speed and the current opening degree of the accelerator pedal according to the second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle.
The beneficial effects are as follows: the invention converts the first relation of the vehicle speed, the accelerator pedal opening and the vehicle driving force under the standard working condition into the second relation of the vehicle speed, the accelerator pedal opening and the vehicle acceleration, obtains the current vehicle acceleration according to the current vehicle speed, the current accelerator pedal opening and the second relation in the vehicle driving process, calculates the current vehicle acceleration according to the current vehicle resistance and the current vehicle acceleration, and corrects the vehicle driving force in the first relation by using the value. The invention dynamically adjusts the driving force of the whole vehicle by taking the resistance of the whole vehicle into consideration in combination with the actual running condition, can meet the power requirement without greatly changing the opening degree of an accelerator pedal under the conditions of changing the environment of the whole vehicle and different resistance of the whole vehicle, improves the driving feeling of a driver, improves the comfort level and the satisfaction degree, reduces the operation difficulty of the driver, and prevents the occurrence of accidents caused by the fact that the driver cannot know the power MAP of the changed vehicle when the vehicle is changed.
As a further improvement of the method, in order to accurately calculate the vehicle resistance to improve the driving experience, the vehicle resistance includes at least one of the following resistances: rolling resistance, air resistance, slope resistance, and acceleration resistance; the rolling resistance is as follows: ffWherein, F isfIs rolling resistance, f is a rolling resistance coefficient, m is the whole vehicle mass, g is gravity acceleration, and alpha is an inclination angle of a road surface; the air resistance is:
Figure BDA0002169795350000031
wherein, FWAs air resistance, CDIs the coefficient of air resistance, A is the acceleration, ρ is the air density, V is the vehicle speed, V is the velocityWIs the wind speed component in the moving direction of the vehicle, and is a positive value when the value is the same as the vehicle speed direction; the gradient resistance is as follows: fiM.g.sin α, wherein FiThe gradient resistance is adopted, m is the mass of the whole vehicle, g is the gravity acceleration, and alpha is the inclination angle of the road surface; the acceleration resistance is:
Figure BDA0002169795350000032
wherein, FjIn order to accelerate the resistance, delta is the conversion coefficient of the rotating mass of the vehicle, m is the mass of the whole vehicle,
Figure BDA0002169795350000033
is the running acceleration.
As a further improvement of the vehicle, in order to accurately calculate the resistance of the whole vehicle, the system further comprises a positioning device and a communication module, wherein the positioning device is in communication connection with the intelligent terminal and is used for transmitting the current position information of the vehicle to the intelligent terminal; the intelligent terminal carries out data interaction with the cloud server through the communication module to send the position information of the vehicle to the cloud server, and receives the rolling resistance coefficient and the inclination angle of the road surface which are returned by the cloud server and obtained according to the current position information of the vehicle, and the wind speed component and the air density which are returned and obtained according to the current weather and in the motion direction of the vehicle.
As further improvement of the method, the device and the vehicle, in order to improve the safety of vehicle driving, the method also comprises the step of correcting the current acceleration of the whole vehicle according to the mental state of the driver: the lower the mental state grade of the mental state of the driver is, the larger the reduction amplitude of the current acceleration of the whole vehicle is; wherein a lower mental state rank indicates a worse mental state of the driver.
As a further improvement of the method and the device, in order to improve the safety of vehicle driving, the method also comprises the step of correcting the current acceleration of the whole vehicle according to the weather state of the vehicle: the lower the weather grade of the weather state of the vehicle is, the larger the reduction amplitude of the current acceleration of the whole vehicle is; wherein a lower weather rating indicates worse weather.
Drawings
FIG. 1 is a flow chart of a method of a vehicle embodiment of the present invention.
Detailed Description
The method comprises the following steps:
firstly, a first relation between the vehicle speed and the opening degree of an accelerator pedal under a standard working condition and the driving force of the whole vehicle, namely power MAP, is obtained, the power MAP is a two-dimensional table with the opening degree of the accelerator pedal in the transverse direction and the vehicle speed in the longitudinal direction, as shown in a table 1, and the driving force is output by the whole vehicle according to the table in the actual driving process. The power MAP is prior art and will not be described further herein.
Then, according to Newton's first law Ft-FzMa, wherein FtAs a driving force, FzThe method is characterized in that the resistance of the whole vehicle, m is the mass of the whole vehicle, a is the acceleration of the whole vehicle, and after the resistance of the whole vehicle and the mass of the whole vehicle under a standard working condition are obtained, the dynamic MAP can be converted into the acceleration MAP, wherein the acceleration MAP is the vehicle speed, the opening degree of an accelerator pedal and the accelerationAnd a second relation of the acceleration of the whole vehicle. In general, the overall vehicle resistance of a vehicle during driving includes: rolling resistance FfAir resistance FWSlope resistance FiAnd acceleration resistance Fj。
The specific calculation formula of each resistance is as follows:
1) the rolling resistance is: ffWherein, F isfIs rolling resistance, f is a rolling resistance coefficient, m is the whole vehicle mass, g is gravity acceleration, and alpha is an inclination angle of a road surface;
2) the air resistance is:
Figure BDA0002169795350000041
wherein, FWAs air resistance, CDIs the air resistance coefficient, A is the windward area, rho is the air density, V is the speed of the vehicleWIs the wind speed component in the moving direction of the vehicle, and is a positive value when the value is the same as the vehicle speed direction;
3) the gradient resistance is: fiM.g.sin α, wherein FiThe gradient resistance is adopted, m is the mass of the whole vehicle, g is the gravity acceleration, and alpha is the inclination angle of the road surface;
4) the acceleration resistance is:
Figure BDA0002169795350000042
wherein, FjIn order to accelerate the resistance, delta is the conversion coefficient of the rotating mass of the vehicle, m is the mass of the whole vehicle,
Figure BDA0002169795350000043
is the running acceleration.
The converted second relationship is shown in table 2 (which is a relationship table of the partial vehicle speed, the accelerator pedal opening degree, and the entire vehicle acceleration). Wherein the unit of the vehicle speed is km/h, the unit of the opening degree of an accelerator pedal is km/h, and the unit of the acceleration of the whole vehicle is m/s2。
TABLE 2
Figure BDA0002169795350000051
Then, continuously collecting the current information of the vehicle in the running process of the vehicle, wherein the current information comprises the current mass m of the whole vehiclenAnd the current vehicle speed, the inclination angle of the road surface and other information are obtained according to the calculation formulas of all the resistances to obtain the current vehicle speed and the current vehicle resistance F of the whole vehicle under the current accelerator pedal openingzn(ii) a Then obtaining the current acceleration of the whole vehicle corresponding to the current vehicle speed and the current opening degree of the accelerator pedal according to the second relation; according to the current acceleration and the current mass m of the whole vehiclenCurrent resistance F of the whole vehicleznAnd calculating to obtain the current driving force F of the whole vehicletn. By using the obtained current driving force F of the whole vehicletnAnd correcting the whole vehicle driving force corresponding to the current vehicle speed and the current accelerator pedal opening degree in the first relation.
According to the process, the power MAP can be adjusted according to the acceleration MAP, so that the driving feeling of a driver is improved.
In addition, in order to improve the driving safety, after the current acceleration of the whole vehicle corresponding to the current vehicle speed and the current accelerator pedal opening degree is obtained, the current acceleration of the whole vehicle can be corrected according to the mental state of the driver, and the lower the mental state level of the mental state of the driver, the larger the reduction range of the current acceleration of the whole vehicle is. For example, the relationship between the mental state grade of the specific driver and the corresponding correction amplitude may adopt the corresponding relationship shown in the following table 3:
TABLE 3
Figure BDA0002169795350000052
The judgment of each mental state grade can be obtained by measuring pulse, heartbeat and the like, and can also be obtained by judging through technologies such as image recognition and the like. For example, the states of fatigue, heart injury and the like can be judged by acquiring images through a camera and carrying out image recognition; substances such as glucose, adenosine triphosphate and the like can be detected by implanting a skin sensor, and whether serious sudden diseases occur or not is judged according to the dynamic detection level; an 'electronic tattoo' metal sensor can be used for detecting heartbeat, skin temperature, blood pressure trend, blood oxygen saturation and the like; the alcohol concentration detection device can be prevented from being arranged on the steering wheel to judge whether the driver is drunk or not; the emotion (such as tension, anger) can be judged by arranging sensors such as temperature and pressure on the surface of the hand; non-invasive biological brain wave sensors (brain wave judging emotion, etc.) can also be worn on the head. The mental state grade can be judged by combining the data collected by the sensors, the historical data of the user and the existing characteristic parameter library in the medical field to carry out dynamic comparison so as to judge the mental state grade of the driver dynamically.
Furthermore, the current acceleration of the whole vehicle can be corrected according to the weather state of the vehicle, and the lower the weather level corresponding to the weather state of the vehicle, the larger the reduction amplitude of the current acceleration of the whole vehicle is. The relationship between specific weather levels and corresponding correction magnitudes can be shown in table 4 below:
TABLE 4
Figure BDA0002169795350000061
In this embodiment, the entire vehicle running resistance used is the sum of rolling resistance, air resistance, gradient resistance, and acceleration resistance. As other embodiments, according to the actual running condition of the entire vehicle, some resistance can be ignored under the condition of small resistance, so that only one, two or three of the four resistances are used, and other resistance which is not described in the embodiment can be increased to better meet the actual running condition of the entire vehicle.
In addition, if the corrected power parameter of the whole vehicle exceeds the upper limit of the power system, the power system is taken on-line as a final parameter for adjustment.
The embodiment of the device is as follows:
the embodiment provides a new energy vehicle driving force correcting device which comprises a memory and a processor, wherein the memory stores a first relation between the vehicle speed, the opening degree of an accelerator pedal and the driving force of a whole vehicle under a standard working condition and a second relation between the vehicle speed, the opening degree of the accelerator pedal and the acceleration of the whole vehicle, and the second relation is obtained by converting the first relation according to the resistance of the whole vehicle under the standard working condition; the memory further stores instructions, and the processor is configured to execute the instructions stored in the memory to implement a driving force correction method for a new energy vehicle, which has been described in detail in the method embodiment and is not described herein again.
The embodiment of the vehicle is as follows:
this embodiment provides a new forms of energy vehicle, and this vehicle includes intelligent terminal, positioner and communication module.
The positioning device is in communication connection with the intelligent terminal and used for transmitting the current position information of the vehicle to the intelligent terminal.
The communication module is used for realizing data interaction between the intelligent terminal and the cloud server, sending the position information of the vehicle acquired by the intelligent terminal to the cloud server, and sending the rolling resistance coefficient, the inclination angle of the road surface, the returned information such as the wind speed component, the air density and the like in the motion direction of the vehicle, which are obtained according to the current weather and returned by the cloud server, to the intelligent terminal.
The intelligent terminal stores a first relation between the vehicle speed, the opening degree of an accelerator pedal and the driving force of the whole vehicle under a standard working condition, is used for calculating the resistance of the whole vehicle under the standard working condition, and converts the first relation into a second relation between the vehicle speed, the opening degree of the accelerator pedal and the acceleration of the whole vehicle according to the obtained resistance of the whole vehicle; acquiring the current resistance of the whole vehicle, the current quality of the whole vehicle, the current speed and the current opening degree of an accelerator pedal in the running process of the vehicle, wherein the calculation of the current resistance is related to the rolling resistance coefficient, the inclination angle of the road surface and other information returned by the introduced cloud server, and the current acceleration of the whole vehicle corresponding to the current speed and the current opening degree of the accelerator pedal is obtained according to a second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle. This process is the method described in the method embodiment above.
This is illustrated in connection with FIG. 1 and the specific examples that followThe vehicle implemented method is further described. It should be noted that, in this embodiment, whether the calculation of the resistance of the entire vehicle under the standard working condition or the calculation of the current resistance of the entire vehicle is performed, the calculation of each resistance is performed by using the calculation formula of each resistance in the method embodiment, but the representation of each parameter involved therein is slightly different, and the parameter marked with n below represents the current parameter, for example, fnRepresenting the coefficient of rolling resistance of the current road surface, FfnIndicating the current rolling resistance of the whole vehicle.
1. The intelligent terminal stores a first relation and a second relation, the first relation represents the relation between the vehicle speed and the opening degree of an accelerator pedal and the driving force of the whole vehicle, the second relation represents the relation between the vehicle speed and the opening degree of the accelerator pedal and the acceleration of the whole vehicle, and the acquisition process of the second relation is as follows: acquiring a first relation between the vehicle speed, the opening degree of an accelerator pedal and the driving force of the whole vehicle under a standard working condition, calculating the resistance of the whole vehicle under the standard working condition, and calculating the resistance according to a Newton's first law Ft-FzAnd converting the first relation into a second relation according to ma and the obtained integral vehicle resistance. After the system initialization is finished, reading the state of the whole vehicle, including a second relation, a windward area A and an air resistance coefficient CDCurrent mass m of the whole vehiclenCurrent vehicle speed VnAnd the current accelerator pedal opening degree and other state information, so that the current acceleration a of the whole vehicle corresponding to the current vehicle speed and the current accelerator pedal opening degree is obtained according to the second relation, the current vehicle speed and the current accelerator pedal opening degreen。
2. The mental state of the driver is identified through an image identification technology, an infrared technology, a bracelet, APP software and the like, and the identified mental state is sent to the intelligent terminal. The intelligent terminal adjusts the current acceleration a of the whole vehicle according to the mental state of the drivernThe specific correction method is shown in table 3 in the method example to improve the driving safety.
3. The positioning device collects current position information of the vehicle and sends the current position information to the intelligent terminal, the intelligent terminal sends the position information to the cloud server through the communication module, and the cloud server obtains a rolling resistance coefficient f of the current road surface according to the current position information of the vehiclenAngle of inclination alpha with the current road surfacen. For example, the rolling resistance coefficient f is obtained when the vehicle is on a good asphalt pavement or concrete pavement according to the current position information of the vehiclen0.010-0.018, the rolling resistance coefficient f of the vehicle on a dry sand road surfacen0.10 to 0.30, and a rolling resistance coefficient f when the vehicle is in the fieldn0.1 to 0.35, etc. Intelligent terminal is combined with current whole vehicle mass mnBy the formula Ffn＝fn·mn·g·cosαnThe current rolling resistance F of the whole vehicle can be calculatedfn. Wherein g is the acceleration of gravity. Meanwhile, the intelligent terminal can also pass through the formula Fin＝mn·g·sinαnCalculating to obtain the current gradient resistance F of the whole vehiclein。
4. After acquiring the current position information of the vehicle, the cloud server obtains the weather information of the current position according to the current position information, so that the wind speed component V in the current motion direction of the vehicle is obtainedWnCurrent air density ρnAir resistance coefficient CDnAnd sending the information to the intelligent terminal. Intelligent terminal reads current vehicle speed VnCombined with the frontal area A of the vehiclenBy the formula
Figure BDA0002169795350000081
The current air resistance F of the whole vehicle can be calculatedWn. In addition, after the intelligent terminal obtains the weather information, the current acceleration a of the whole vehicle can be obtained according to the grade of the weather statenThe correction is performed in a specific manner shown in table 4 in the method embodiment, so as to improve the driving safety.
5. The intelligent terminal obtains a vehicle rotating mass conversion coefficient delta according to the acquired vehicle state informationnCombined with the current vehicle mass mnAnd the current running acceleration
Figure BDA0002169795350000082
By the formula
Figure BDA0002169795350000083
The current acceleration resistance F of the whole vehicle can be calculatedjn。
6. The intelligent terminal calculates the current gradient resistance F of the whole vehicle obtained in the steps 3, 4 and 5inCurrent rolling resistance F of the whole vehiclefnCurrent air resistance F of the whole vehicleWnAnd the current acceleration resistance F of the whole vehiclejnAdding the current resistance F of the whole vehicle to obtainzn＝Ffn+FWn+Fin+Fjn。
7. The intelligent terminal obtains the current resistance F of the whole vehicle according to calculationznAnd the corrected current acceleration a of the whole vehiclenCombined with the current mass m of the whole vehiclenAccording to Newton's first law Ftn-Fzn＝mnanCalculating to obtain the current driving force F of the whole vehicletn. By using the obtained current driving force F of the whole vehicletnAnd correcting the whole vehicle driving force corresponding to the current vehicle speed and the current accelerator pedal opening degree in the first relation.
And in the running process of the vehicle, the steps are continuously repeated, so that the dynamic adjustment of the driving force of the whole vehicle in the first relation can be completed.
It should be noted that the above steps of this embodiment are not necessarily performed in order, and for example, the calculation of each resistance in steps 4, 5, and 6 may be performed simultaneously.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (10)

1. A driving force correction method for a new energy vehicle is characterized by comprising the following steps:
acquiring a first relation between the vehicle speed and the opening of an accelerator pedal under a standard working condition and the driving force of the whole vehicle, calculating the resistance of the whole vehicle under the standard working condition, and converting the first relation into a second relation between the vehicle speed and the opening of the accelerator pedal and the acceleration of the whole vehicle according to the obtained resistance of the whole vehicle;
in the running process of the vehicle, acquiring the current resistance of the whole vehicle, the current quality of the whole vehicle, the current vehicle speed and the current opening degree of an accelerator pedal, and acquiring the current acceleration of the whole vehicle corresponding to the current vehicle speed and the current opening degree of the accelerator pedal according to the second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle.
2. The new energy vehicle driving force correction method according to claim 1, characterized in that the vehicle resistance includes at least one of the following resistances: rolling resistance, air resistance, slope resistance, and acceleration resistance;
the rolling resistance is as follows: ffWherein, F isfIs rolling resistance, f is a rolling resistance coefficient, m is the whole vehicle mass, g is gravity acceleration, and alpha is an inclination angle of a road surface;
the air resistance is:
Figure FDA0002169795340000011
wherein, FWAs air resistance, CDIs the coefficient of air resistance, A is the acceleration, ρ is the air density, V is the vehicle speed, V is the velocityWIs the wind speed component in the moving direction of the vehicle, and is a positive value when the value is the same as the vehicle speed direction;
the gradient resistance is as follows: fiM.g.sin α, wherein FiThe gradient resistance is adopted, m is the mass of the whole vehicle, g is the gravity acceleration, and alpha is the inclination angle of the road surface;
the acceleration resistance is:
Figure FDA0002169795340000012
wherein, FjIn order to accelerate the resistance, delta is the conversion coefficient of the rotating mass of the vehicle, m is the mass of the whole vehicle,
Figure FDA0002169795340000013
is the running acceleration.
3. The driving force correction method of a new energy vehicle according to claim 1 or 2, characterized by further comprising the step of correcting the current acceleration of the entire vehicle in accordance with the state of mind of the driver: the lower the mental state grade of the mental state of the driver is, the larger the reduction amplitude of the current acceleration of the whole vehicle is; wherein a lower mental state rank indicates a worse mental state of the driver.
4. The driving force correction method for the new energy vehicle according to claim 1 or 2, characterized by further comprising the step of correcting the current acceleration of the entire vehicle according to the weather condition of the vehicle: the lower the weather grade corresponding to the weather state of the vehicle, the larger the reduction amplitude of the current acceleration of the whole vehicle is; wherein a lower weather rating indicates worse weather.
5. The new energy vehicle driving force correction device is characterized by comprising a memory and a processor, wherein a first relation between the vehicle speed, the opening degree of an accelerator pedal and the driving force of the whole vehicle and a second relation between the vehicle speed, the opening degree of the accelerator pedal and the acceleration of the whole vehicle under a standard working condition are stored in the memory, and the second relation is obtained by converting the first relation according to the resistance of the whole vehicle under the standard working condition; the memory further has instructions stored therein, and the processor is configured to execute the instructions stored in the memory to implement the method steps of:
in the running process of the vehicle, acquiring the current resistance of the whole vehicle, the current quality of the whole vehicle, the current vehicle speed and the current opening degree of an accelerator pedal, and acquiring the current acceleration of the whole vehicle corresponding to the current vehicle speed and the current opening degree of the accelerator pedal according to the second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle.
6. A driving force correction device for a new energy vehicle according to claim 5, characterized by further comprising a step of correcting a current acceleration of the entire vehicle in accordance with a state of mind of a driver: the lower the mental state grade of the mental state of the driver is, the larger the reduction amplitude of the current acceleration of the whole vehicle is; wherein a lower mental state rank indicates a worse mental state of the driver.
7. The driving force correction device for the new energy vehicle according to claim 5, characterized by further comprising a step of correcting the current acceleration of the entire vehicle in accordance with the weather condition of the vehicle: the lower the weather grade corresponding to the weather state of the vehicle, the larger the reduction amplitude of the current acceleration of the whole vehicle is; wherein a lower weather rating indicates worse weather.
8. A new energy vehicle comprises an intelligent terminal and is characterized in that a first relation between the vehicle speed, the opening degree of an accelerator pedal and the driving force of the whole vehicle under a standard working condition is stored in the intelligent terminal, the intelligent terminal is used for calculating the resistance of the whole vehicle under the standard working condition, and the first relation is converted into a second relation between the vehicle speed, the opening degree of the accelerator pedal and the acceleration of the whole vehicle according to the obtained resistance of the whole vehicle; acquiring the current resistance, the current quality, the current speed and the current opening degree of an accelerator pedal of the whole vehicle in the running process of the vehicle, and acquiring the current acceleration of the whole vehicle corresponding to the current speed and the current opening degree of the accelerator pedal according to the second relation; and calculating to obtain the current driving force of the whole vehicle according to the current acceleration, the current quality and the current resistance of the whole vehicle, and correcting the driving force of the whole vehicle corresponding to the current speed and the current opening degree of an accelerator pedal in the first relation by using the obtained current driving force of the whole vehicle.
9. The new energy vehicle as claimed in claim 8, further comprising a positioning device and a communication module, wherein the positioning device is in communication connection with the intelligent terminal and is used for transmitting the current position information of the vehicle to the intelligent terminal; the intelligent terminal carries out data interaction with the cloud server through the communication module to send the position information of the vehicle to the cloud server, and receives the rolling resistance coefficient and the inclination angle of the road surface which are returned by the cloud server and obtained according to the current position information of the vehicle, and the wind speed component and the air density which are returned and obtained according to the current weather and in the motion direction of the vehicle.
10. The new energy vehicle according to claim 8 or 9, characterized by further comprising a step of correcting the current acceleration of the entire vehicle in accordance with the state of mind of the driver: the lower the mental state grade of the mental state of the driver is, the larger the reduction amplitude of the current acceleration of the whole vehicle is; wherein a lower mental state rank indicates a worse mental state of the driver.
CN201910759400.3A 2019-08-16 2019-08-16 New energy vehicle and driving force correction method and device thereof Active CN112440999B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910759400.3A CN112440999B (en) 2019-08-16 2019-08-16 New energy vehicle and driving force correction method and device thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910759400.3A CN112440999B (en) 2019-08-16 2019-08-16 New energy vehicle and driving force correction method and device thereof

Publications (2)

Publication Number Publication Date
CN112440999A true CN112440999A (en) 2021-03-05
CN112440999B CN112440999B (en) 2022-05-20

Family

ID=74740880

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910759400.3A Active CN112440999B (en) 2019-08-16 2019-08-16 New energy vehicle and driving force correction method and device thereof

Country Status (1)

Country Link
CN (1) CN112440999B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113787962A (en) * 2021-09-16 2021-12-14 东风汽车集团股份有限公司 Sound production control method and system of active sound wave device
CN114707366A (en) * 2022-06-06 2022-07-05 江铃汽车股份有限公司 Vehicle running resistance calculation method and system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011106944A1 (en) * 2010-03-04 2011-09-09 Luan Jisheng Hybrid drive system and control method thereof
WO2012097681A1 (en) * 2011-01-18 2012-07-26 Wang Haipeng Method and apparatus for supplemental motor vehicle speed reduction
CN103264669A (en) * 2013-05-31 2013-08-28 吉林大学 Heavy vehicle weight real-time identification method based on CAN information and function principle
CN103287434A (en) * 2012-02-22 2013-09-11 厦门金龙联合汽车工业有限公司 Engine self-adaptive system based on vehicle operation conditions
CN105620465A (en) * 2014-11-27 2016-06-01 比亚迪股份有限公司 Gear shifting point correction method and device for vehicle and vehicle
CN109204310A (en) * 2017-06-29 2019-01-15 上海汽车集团股份有限公司 vehicle power control method and device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011106944A1 (en) * 2010-03-04 2011-09-09 Luan Jisheng Hybrid drive system and control method thereof
WO2012097681A1 (en) * 2011-01-18 2012-07-26 Wang Haipeng Method and apparatus for supplemental motor vehicle speed reduction
CN103287434A (en) * 2012-02-22 2013-09-11 厦门金龙联合汽车工业有限公司 Engine self-adaptive system based on vehicle operation conditions
CN103264669A (en) * 2013-05-31 2013-08-28 吉林大学 Heavy vehicle weight real-time identification method based on CAN information and function principle
CN105620465A (en) * 2014-11-27 2016-06-01 比亚迪股份有限公司 Gear shifting point correction method and device for vehicle and vehicle
CN109204310A (en) * 2017-06-29 2019-01-15 上海汽车集团股份有限公司 vehicle power control method and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113787962A (en) * 2021-09-16 2021-12-14 东风汽车集团股份有限公司 Sound production control method and system of active sound wave device
CN114707366A (en) * 2022-06-06 2022-07-05 江铃汽车股份有限公司 Vehicle running resistance calculation method and system

Also Published As

Publication number Publication date
CN112440999B (en) 2022-05-20

Similar Documents

Publication Publication Date Title
CN112440999B (en) New energy vehicle and driving force correction method and device thereof
CN105741494B (en) A kind of driver fatigue monitoring method based on Data Matching under line
CN104260725B (en) A kind of intelligent driving system containing pilot model
CN101678859B (en) Driver assistance device and method for the control thereof
US9549686B2 (en) Method, apparatus, and program for evaluating drivability of a vehicle
CN101949704B (en) Reliability evaluation device, reliability evaluation method
CN108995653A (en) A kind of driver's driving style recognition methods and system
GB2525079A (en) Vehicle operator monitoring and operations adjustments
CN108742610A (en) A kind of realization myoelectricity and subjective associated steering Comfort Evaluation method
CN109927720B (en) Dynamic braking auxiliary control method, device and system
CN108674482B (en) Electric power steering system, control method and vehicle
TW202218623A (en) Motion sickness detection system for autonomous vehicles
JP7073880B2 (en) Career decision device
CN107595273A (en) A kind of heart rate evaluation method and device
WO2022095985A1 (en) Method and system for evaluating comfort of passenger of intelligent driving vehicle
CN110239558B (en) Driving style layered fuzzy recognition system based on recognition coefficient
CN106184225A (en) Longitudinal automobile speedestimate method that distributed type four-wheel-driven electrical vehicular power controls
CN110667398A (en) Drive control method and system for electric vehicle
CN111968372A (en) Multi-vehicle type mixed traffic following behavior simulation method considering subjective factors
CN110843765A (en) Automatic driving method and device and electronic equipment
CN108742609A (en) A kind of driver's lane-change Comfort Evaluation method based on myoelectricity and manipulation information
CN101920703A (en) Be used for controlling the system and method for the tractive force of sulky vehicle
CN113628448B (en) Vehicle and fatigue driving relieving device thereof
EP1393671A3 (en) Walking support system
CN100348042C (en) Display system for vehicle and method of controlling the same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information
CB02 Change of applicant information

Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province

Applicant after: Yutong Bus Co.,Ltd.

Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province

Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd.

GR01 Patent grant
GR01 Patent grant