Drive control method and system for electric vehicle
阅读说明：本技术 电动车辆的驱动控制方法及系统 (Drive control method and system for electric vehicle ) 是由 张帅 翁浩宇 刘秀 李岩 王银磊 于 2018-12-29 设计创作，主要内容包括：本发明涉及新能源车辆技术领域,提供一种电动车辆的驱动控制方法及系统,其中该电动车辆的驱动控制方法包括：获取电动车辆的油门开度信息；基于预配置的稳速油门功率参照表确定与所获取的油门开度信息相对应的目标电机驱动功率,其中稳速油门功率参照表存储有多组油门开度信息与相对应的电机驱动功率之间的关系,且每一电机驱动功率分别对应于电动车辆的不同的稳定速度；基于目标电机驱动功率驱动电动车辆的电动机,以使得电动车辆按照目标电机驱动功率所对应的目标稳定速度匀速行驶。由此,避免了频繁操作油门踏板所导致的操作负担和劳动作业强度,且通过操作不同油门开度信息能实现电动车辆以不同的速度而稳速行驶,还提高了用户驾驶体验。(The invention relates to the technical field of new energy vehicles, and provides a drive control method and a drive control system of an electric vehicle, wherein the drive control method of the electric vehicle comprises the following steps: acquiring accelerator opening information of the electric vehicle; determining target motor driving power corresponding to the acquired accelerator opening information based on a pre-configured speed-stabilizing accelerator power reference table, wherein the speed-stabilizing accelerator power reference table stores the relationship between a plurality of groups of accelerator opening information and corresponding motor driving power, and each motor driving power corresponds to different stable speeds of the electric vehicle; and driving a motor of the electric vehicle based on the target motor driving power so that the electric vehicle runs at a constant speed according to a target stable speed corresponding to the target motor driving power. Therefore, operation burden and labor operation intensity caused by frequent operation of the accelerator pedal are avoided, the electric vehicle can run at different speeds and at stable speed by operating different accelerator opening information, and the driving experience of a user is improved.)
1. A drive control method of an electric vehicle, characterized by comprising:
acquiring accelerator opening information of the electric vehicle;
determining target motor driving power corresponding to the acquired accelerator opening information based on a pre-configured speed-stabilizing accelerator power reference table, wherein the speed-stabilizing accelerator power reference table stores the relationship between a plurality of groups of accelerator opening information and corresponding motor driving power, and each motor driving power corresponds to different stable speeds of the electric vehicle;
and driving a motor of the electric vehicle based on the determined target motor driving power so that the electric vehicle runs at a constant speed according to a target stable speed corresponding to the target motor driving power.
2. The driving control method of an electric vehicle according to claim 1, wherein the accelerator opening of the electric vehicle includes a steady accelerator opening section and an over-speed accelerator opening section that is larger than the steady accelerator opening section, wherein the determining the target motor driving power corresponding to the acquired accelerator opening information based on the pre-configured steady accelerator power reference table includes:
judging whether the acquired accelerator opening information is in the speed-stabilizing accelerator opening interval or not; and
and when the acquired accelerator opening information is within the speed-stabilizing accelerator opening interval, determining the target motor driving power corresponding to the acquired accelerator opening information based on the speed-stabilizing accelerator power reference table.
3. The drive control method of an electric vehicle according to claim 2, characterized in that when the acquired accelerator opening information is not within the steady accelerator opening section, the method further comprises:
judging whether the acquired accelerator opening information is in the overspeed accelerator opening interval or not; and
and if the acquired accelerator opening information is in the overspeed accelerator opening interval, determining the motor driving power corresponding to the accelerator opening information according to an electronic accelerator characteristic curve, wherein the electronic accelerator characteristic curve indicates a positive correlation between the accelerator opening information and the motor driving power under a normal working condition.
4. The method of claim 1, wherein the electric vehicle is configured to have a plurality of operation modes, and different operation modes of the same accelerator opening information in the steady-speed accelerator power reference table respectively correspond to different steady speeds and/or motor driving powers of the electric vehicle, wherein the determining the target motor driving power corresponding to the acquired accelerator opening information based on the pre-configured steady-speed accelerator power reference table comprises:
acquiring a current working mode of the electric vehicle;
and inquiring the speed-stabilizing accelerator power reference table based on the current working mode and the acquired accelerator opening information so as to determine the corresponding target motor driving power.
5. The drive control method of an electric vehicle according to claim 1, characterized in that before determining the target motor drive power corresponding to the acquired accelerator opening degree information based on a pre-configured steady accelerator power reference table, the method further comprises:
acquiring the whole vehicle sliding resistance of the electric vehicle at a calibrated running speed, wherein the calibrated running speed corresponds to the information of the calibrated accelerator opening;
determining the whole vehicle resistance power corresponding to the whole vehicle sliding resistance;
determining a calibrated motor driving power corresponding to the running speed based on the whole vehicle resistance power and the preconfigured motor driving conversion efficiency;
and constructing the power reference table of the speed-stabilizing accelerator based on the calibrated motor driving power and the calibrated running speed.
6. A drive control system of an electric vehicle, characterized by comprising:
the accelerator opening information acquisition unit is used for acquiring accelerator opening information of the electric vehicle;
a motor driving power determining unit, configured to determine a target motor driving power corresponding to the acquired accelerator opening information based on a pre-configured speed-stabilizing accelerator power reference table, where the speed-stabilizing accelerator power reference table stores relationships between a plurality of sets of accelerator opening information and corresponding motor driving powers, and each motor driving power corresponds to a different stable speed of the electric vehicle;
and the motor driving unit is used for driving a motor of the electric vehicle based on the determined target motor driving power so that the electric vehicle runs at a constant speed according to a target stable speed corresponding to the target motor driving power.
7. The drive control system of an electric vehicle according to claim 1, wherein the accelerator opening of the electric vehicle includes a steady accelerator opening section and an over-speed accelerator opening section that is larger than the steady accelerator opening section, wherein the motor drive power determination unit includes:
the speed stabilizing judgment module is used for judging whether the acquired accelerator opening information is in the speed stabilizing accelerator opening interval or not; and
and the motor power determining module is used for determining the target motor driving power corresponding to the acquired accelerator opening information based on the speed-stabilizing accelerator power reference table when the acquired accelerator opening information is in the speed-stabilizing accelerator opening interval.
8. The drive control system of an electric vehicle according to claim 7, characterized by further comprising an overspeed power determination unit when the acquired accelerator opening information is not within the steady accelerator opening section, wherein the overspeed power determination unit comprises:
the overspeed judgment module is used for judging whether the acquired accelerator opening information is in the overspeed accelerator opening interval or not; and
and the accelerator driving module is used for determining the motor driving power corresponding to the accelerator opening information according to an electronic accelerator characteristic curve if the acquired accelerator opening information is in the overspeed accelerator opening interval, wherein the electronic accelerator characteristic curve indicates the positive correlation between the accelerator opening information and the motor driving power under the normal working condition.
9. The drive control system of an electric vehicle according to claim 6, wherein the electric vehicle is configured to have a plurality of operation modes, and different operation modes of the same accelerator opening degree information in the steady accelerator power reference table respectively correspond to different steady speeds and/or motor drive powers of the electric vehicle, wherein the motor drive power determination unit includes:
the mode acquisition module is used for acquiring the current working mode of the electric vehicle;
and the mode power determination module is used for inquiring the speed-stabilizing accelerator power reference table based on the current working mode and the acquired accelerator opening information so as to determine the corresponding target motor driving power.
10. The drive control system of an electric vehicle according to claim 6, characterized by further comprising a table calibration unit, wherein the table calibration unit includes:
the whole vehicle resistance obtaining module is used for obtaining the whole vehicle sliding resistance of the electric vehicle at a calibrated running speed before determining the target motor driving power corresponding to the obtained accelerator opening information based on a pre-configured speed-stabilizing accelerator power reference table, wherein the calibrated running speed corresponds to the calibrated accelerator opening information;
the whole vehicle resistance power determining module is used for determining whole vehicle resistance power corresponding to the whole vehicle sliding resistance;
the calibration power determining module is used for determining the calibration motor driving power corresponding to the running speed based on the whole vehicle resistance power and the pre-configured motor driving conversion efficiency;
and the reference table construction module is used for constructing the speed-stabilizing accelerator power reference table based on the calibrated motor driving power and the calibrated running speed.
Technical Field
The invention relates to the technical field of new energy vehicles, in particular to a driving control method and a driving control system of an electric vehicle.
Background
Along with the large consumption of petroleum resources and the increasing pollution of global atmospheric environment, governments and automobile enterprises in various countries generally recognize that energy conservation and emission reduction are the development directions of future automobile technologies, and electric automobiles have the environmental protection characteristics of high efficiency, energy conservation, low emission or zero emission, and are in line with the development directions of future energy conservation and emission reduction of automobile industries, so that the electric automobiles are widely regarded by countries in the world.
Different from the traditional fuel vehicle, the motor has a larger rotating speed range and more excellent torque characteristics, so that the power requirement of the whole vehicle can be met under the condition of not increasing the gear of a gearbox, and the current electric vehicle is driven to run by generally driving the vehicle according to the accelerator running curve of the motor.
In practicing the present application, the applicant of the present application found that: on one hand, the speed of the electric vehicle is very sensitive to the working condition of the opening degree of the accelerator, when the vehicle needs to run at a constant speed, a driver needs to frequently operate the accelerator pedal to keep the vehicle going forward at a stable speed, and the operation burden and the labor operation intensity of the driver are increased; on the other hand, some users may desire to drive at a constant speed at different speeds under different application scenarios (e.g., vehicle following, vehicle highway driving, etc.), which is also one of the popular research directions in the industry at present.
Disclosure of Invention
In view of the above, the present invention is directed to a driving control method for an electric vehicle, so as to at least solve the technical problems of the prior art that the operation burden and the labor intensity are caused by frequently operating an accelerator pedal, and that a plurality of speed stabilizing control strategies suitable for various application scenarios cannot be provided for the electric vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a drive control method of an electric vehicle, comprising: acquiring accelerator opening information of the electric vehicle; determining target motor driving power corresponding to the acquired accelerator opening information based on a pre-configured speed-stabilizing accelerator power reference table, wherein the speed-stabilizing accelerator power reference table stores the relationship between a plurality of groups of accelerator opening information and corresponding motor driving power, and each motor driving power corresponds to different stable speeds of the electric vehicle; and driving a motor of the electric vehicle based on the determined target motor driving power so that the electric vehicle runs at a constant speed according to a target stable speed corresponding to the target motor driving power.
Further, the accelerator opening of the electric vehicle includes a steady accelerator opening interval and an overspeed accelerator opening interval larger than the steady accelerator opening interval, wherein the determining the target motor driving power corresponding to the acquired accelerator opening information based on the preconfigured steady accelerator power reference table includes: judging whether the acquired accelerator opening information is in the speed-stabilizing accelerator opening interval or not; and when the acquired accelerator opening information is in the speed-stabilizing accelerator opening interval, determining the target motor driving power corresponding to the acquired accelerator opening information based on the speed-stabilizing accelerator power reference table.
Further, when the acquired accelerator opening information is not in the steady accelerator opening interval, the method further comprises: judging whether the acquired accelerator opening information is in the overspeed accelerator opening interval or not; and if the acquired accelerator opening information is in the overspeed accelerator opening interval, determining motor driving power corresponding to the accelerator opening information according to an electronic accelerator characteristic curve, wherein the electronic accelerator characteristic curve indicates a positive correlation between the accelerator opening information and the motor driving power under a normal working condition.
Further, the electric vehicle is configured to have a plurality of operation modes, and different operation modes of the same accelerator opening information in the steady accelerator power reference table respectively correspond to different steady speeds and/or motor driving powers of the electric vehicle, wherein the determining the target motor driving power corresponding to the acquired accelerator opening information based on the pre-configured steady accelerator power reference table comprises: acquiring a current working mode of the electric vehicle; and inquiring the speed-stabilizing accelerator power reference table based on the current working mode and the acquired accelerator opening information so as to determine the corresponding target motor driving power.
Further, before determining the target motor driving power corresponding to the acquired accelerator opening information based on the pre-configured steady accelerator power reference table, the method further includes: acquiring the whole vehicle sliding resistance of the electric vehicle at a calibrated running speed, wherein the calibrated running speed corresponds to the information of the calibrated accelerator opening; determining the whole vehicle resistance power corresponding to the whole vehicle sliding resistance; determining a calibrated motor driving power corresponding to the running speed based on the whole vehicle resistance power and the preconfigured motor driving conversion efficiency; and constructing the power reference table of the speed-stabilizing accelerator based on the calibrated motor driving power and the calibrated running speed.
Compared with the prior art, the driving control method of the electric vehicle has the following advantages:
in the driving control method of the electric vehicle, a pre-configured speed-stabilizing accelerator power reference table with different stable speeds corresponding to the vehicle is utilized, and comparison query is carried out by means of the acquired accelerator opening information reference, so that the speed-stabilizing running of the vehicle is realized based on the motor power control of the corresponding accelerator; in addition, different motor driving powers correspond to different stable speeds, and the relation between the motor driving power and the accelerator opening information is recorded in the reference table, so that a user can realize that the electric vehicle runs at different speeds and at stable speeds by operating under different accelerator opening information, the personalized speed requirement of the user on constant-speed running under different application scenes is met, and the user experience is improved.
Another object of the present invention is to provide a driving control system for an electric vehicle, so as to solve at least the technical problems of the prior art that the operation burden and the labor intensity are caused by frequently operating an accelerator pedal, and that a plurality of speed stabilizing control strategies suitable for various application scenarios cannot be provided for the electric vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a drive control system of an electric vehicle, comprising: the accelerator opening information acquisition unit is used for acquiring accelerator opening information of the electric vehicle; a motor driving power determining unit, configured to determine a target motor driving power corresponding to the acquired accelerator opening information based on a pre-configured speed-stabilizing accelerator power reference table, where the speed-stabilizing accelerator power reference table stores relationships between a plurality of sets of accelerator opening information and corresponding motor driving powers, and each motor driving power corresponds to a different stable speed of the electric vehicle; and the motor driving unit is used for driving a motor of the electric vehicle based on the determined target motor driving power so that the electric vehicle runs at a constant speed according to a target stable speed corresponding to the target motor driving power.
Further, the accelerator opening of the electric vehicle includes a steady accelerator opening interval and an overspeed accelerator opening interval larger than the steady accelerator opening interval, wherein the motor driving power determining unit includes: the speed stabilizing judgment module is used for judging whether the acquired accelerator opening information is in the speed stabilizing accelerator opening interval or not; and the motor power determining module is used for determining the target motor driving power corresponding to the acquired accelerator opening information based on the speed-stabilizing accelerator power reference table when the acquired accelerator opening information is in the speed-stabilizing accelerator opening interval.
Further, when the acquired accelerator opening degree information is not within the steady accelerator opening degree interval, the driving control system of the electric vehicle further includes an overspeed power determining unit, wherein the overspeed power determining unit includes: the overspeed judgment module is used for judging whether the acquired accelerator opening information is in the overspeed accelerator opening interval or not; and the accelerator driving module is used for determining the motor driving power corresponding to the accelerator opening information according to an electronic accelerator characteristic curve if the acquired accelerator opening information is in the overspeed accelerator opening interval, wherein the electronic accelerator characteristic curve indicates the positive correlation between the accelerator opening information and the motor driving power under the normal working condition.
Further, the electric vehicle is configured to have a plurality of operation modes, and different operation modes of the same accelerator opening degree information in the steady accelerator power reference table respectively correspond to different steady speeds and/or motor driving powers of the electric vehicle, wherein the motor driving power determining unit includes: the mode acquisition module is used for acquiring the current working mode of the electric vehicle; and the mode power determination module is used for inquiring the speed-stabilizing accelerator power reference table based on the current working mode and the acquired accelerator opening information so as to determine the corresponding target motor driving power.
Further, the drive control system of an electric vehicle further includes a table calibration unit, wherein the table calibration unit includes: the whole vehicle resistance obtaining module is used for obtaining the whole vehicle sliding resistance of the electric vehicle at a calibrated running speed before determining the target motor driving power corresponding to the obtained accelerator opening information based on a pre-configured speed-stabilizing accelerator power reference table, wherein the calibrated running speed corresponds to the calibrated accelerator opening information; the whole vehicle resistance power determining module is used for determining whole vehicle resistance power corresponding to the whole vehicle sliding resistance; the calibration power determining module is used for determining the calibration motor driving power corresponding to the running speed based on the whole vehicle resistance power and the pre-configured motor driving conversion efficiency; and the reference table construction module is used for constructing the speed-stabilizing accelerator power reference table based on the calibrated motor driving power and the calibrated running speed.
Compared with the prior art, the drive control system of the electric vehicle and the drive control method of the electric vehicle have the same advantages, and are not described again.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a flowchart of a drive control method of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart for establishing a power reference table of a constant speed accelerator in a driving control method of an electric vehicle according to an embodiment of the present invention;
fig. 3 is a flowchart for determining a driving intention of a driver based on accelerator opening information in a driving control method of an electric vehicle according to an embodiment of the present invention;
fig. 4 is a block diagram showing a drive control system of an electric vehicle according to an embodiment of the present invention.
Description of reference numerals:
401 accelerator opening degree information acquiring unit 402 motor driving power determining unit
Drive control system 403 motor drive unit of 40 electric vehicle
404 overspeed power determination unit 405 table calibration unit
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a drive control method for an electric vehicle according to an embodiment of the present invention includes:
and S11, acquiring the accelerator opening information of the electric vehicle.
As for the execution subject of the method of the embodiment of the present invention, it may be implemented by a processing area or a controller provided in the Vehicle itself, such as a Vehicle Control Unit (VCU) or an Electronic Control Unit (ECU); in addition, it may also be performed by a new processor or controller additionally attached to the vehicle, and the above embodiments are all within the scope of the present invention.
It is understood that the electric vehicle in the embodiment of the present invention may include various types of electric vehicles, such as a pure electric vehicle or a hybrid vehicle, and the driving control method of these vehicles in the electric driving mode is implemented, and the above embodiments are within the scope of the present invention.
The acquisition mode of the accelerator opening degree information CAN be acquired by an accelerator opening degree sensor, and the acquired network opening degree information is transmitted to a processor or a controller through a vehicle CAN network; alternatively or additionally, the processor or the controller may obtain the accelerator opening information through other manners (e.g., wireless communication), and the above embodiments are all within the scope of the present invention.
And S12, determining the target motor driving power corresponding to the acquired accelerator opening information based on the pre-configured constant-speed accelerator power reference table.
The speed-stabilizing accelerator power reference table stores the relationship between a plurality of groups of accelerator opening information and corresponding motor driving power, and each motor driving power corresponds to different stable speeds of the electric vehicle.
It should be noted that the relationship form of the steady-speed accelerator power reference table should not be limited herein, for example, the relationship may be a straight line or a curve relationship, or the relationship may also be a mapping relationship (for example, accelerator opening information — motor driving power), and all fall within the protection scope of the present invention; and when the motor is driven by using each motor driving power in the reference table, the driving force of the electric vehicle is matched with the resistance of the whole vehicle, and the electric vehicle can stably run or run at a constant speed according to the stable speed corresponding to the motor driving power in the reference table.
The determination method of the pre-configured reference table of the steady throttle power can be realized by various methods, such as being obtained by a plurality of tests in advance, or being realized by a calibration test, etc. As an example, a steady throttle power reference table may be established by the process shown in FIG. 2: s21, obtaining the whole vehicle sliding resistance of the electric vehicle under the calibrated running speed, wherein the calibrated running speed corresponds to the calibrated accelerator opening information; for example, the relationship between the accelerator opening information and the calibrated running speed may be predetermined, and then the vehicle is subjected to early-stage simulation test and test vehicle sliding test verification to obtain vehicle rolling resistance and air resistance, so as to obtain vehicle sliding resistance. S22, determining the whole vehicle resistance power corresponding to the whole vehicle sliding resistance; for example, the corresponding vehicle resistance power may be determined according to a power calculation formula P ═ F × v. S23, determining a calibrated motor driving power corresponding to the running speed based on the whole vehicle resistance power and the pre-configured motor driving conversion efficiency; it should be noted that, in the process of operating the motor-driven electric vehicle, not all the motor driving power is converted into the entire vehicle driving power, that is, the above-mentioned motor driving conversion efficiency exists between the motor driving power and the entire vehicle driving power, and may be any suitable value pre-configured by a user or a vehicle manufacturer according to the situation, and the value should not be limited herein. S24, establishing a speed-stabilizing accelerator power reference table based on the calibrated motor driving power and the calibrated running speed; for example, a reference table of a mapping relation or a curve relation is constructed on the basis of a plurality of different nominal driving speeds, and a plurality of corresponding nominal motor driving powers are determined correspondingly.
And S13, driving the motor of the electric vehicle based on the determined target motor driving power, so that the electric vehicle runs at a constant speed according to the target stable speed corresponding to the target motor driving power.
In the embodiment of the invention, a pre-calibrated speed-stabilizing accelerator power reference table with different stable speeds corresponding to the vehicle is utilized, and the acquired accelerator opening information is compared with the reference table, so that the speed-stabilizing running of the vehicle is realized based on the motor power control of the corresponding accelerator; in addition, different motor driving powers correspond to different stable speeds, and the relation between the motor driving power and the accelerator opening information is recorded in the reference table, so that a user can realize that the electric vehicle runs at different speeds and at stable speeds by operating under different accelerator opening information, the personalized speed requirement of the user on constant-speed running under different application scenes is met, and the user experience is improved.
In some preferred embodiments, the accelerator opening of the electric vehicle includes a steady accelerator opening interval (or a shallow accelerator interval) and an over-speed accelerator opening interval (or a deep accelerator interval) that is greater than the steady accelerator opening interval; therefore, when the target motor driving power is determined in S12, it is necessary to judge the section to which the accelerator information belongs to determine whether the user has an intention to drive at a steady speed. It should be noted that the whole opening degree of the accelerator may be directly composed of a deep accelerator interval and a shallow accelerator interval, or may include other additional accelerator intervals; in addition, the shallow throttle section may be continuous or spaced from the deep throttle section, and the above embodiments are all within the protection scope of the present invention. As shown in fig. 3, the process of determining the driving intention of the driver based on the accelerator opening degree information includes:
and S31, judging whether the acquired accelerator opening information is in the steady accelerator opening interval.
And S32, when the obtained accelerator opening degree information is in the steady-speed accelerator opening degree interval, determining the target motor driving power corresponding to the obtained accelerator opening degree information based on the steady-speed accelerator power reference table.
And S33, when the acquired accelerator opening information is not in the steady accelerator opening interval, judging whether the acquired accelerator opening information is in the overspeed accelerator opening interval.
And S34, if the acquired accelerator opening information is in the overspeed accelerator opening interval, determining the motor driving power corresponding to the accelerator opening information according to the electronic accelerator characteristic curve.
The electronic accelerator characteristic curve indicates a positive correlation between accelerator opening information and motor driving power under a normal working condition, for example, the depth information of the electronic accelerator under the normal working condition is in direct proportion to the motor driving rotating speed, that is, the deeper the accelerator is, the larger the corresponding motor driving rotating speed and the vehicle acceleration are, so as to realize acceleration or overtaking.
Explaining by taking a shallow accelerator interval of 0-40% and a deep accelerator interval of 40-100% as an example, when the collected accelerator opening information is 20%, the accelerator opening information falls into the shallow accelerator interval, the driver is proved to have a steady-speed driving intention, and the target motor driving power corresponding to the steady speed is determined by performing a curve relation in a table look-up as in S32; when the collected accelerator opening information is 60% and falls into a deep accelerator interval, it is proved that the driver does not have the intention of steady-speed driving, the corresponding target motor driving power is determined according to the normal response to the accelerator opening information, for example, the deeper the accelerator is, the faster the acceleration is, so as to realize the effect of overspeed.
In the embodiment of the invention, a plurality of sections are assigned to one accelerator, and different sections are respectively suitable for different motor driving strategies, so that the purpose of performing stable-speed driving control in a shallow accelerator section and performing overdrive control in a deep accelerator section is realized, and the individualized driving requirements of users are greatly met.
In some more preferred embodiments, the electric vehicle is configured to have a plurality of operation modes such as ECO (energy saving mode), Normal (Normal mode) and Sport (Sport mode) shown in table 1, and different operation modes of the same accelerator opening information in the steady accelerator power reference table correspond to different steady speeds and/or motor driving powers of the electric vehicle, respectively.
TABLE 1 sample of stable vehicle speeds under different modes and different throttle depths
The common throttle interval of the common vehicle is 5-40%, and the common vehicle speed is lower than 120km/h (the highest vehicle speed allowed by the Chinese expressway). Taking this as an example, when designing a steady speed accelerator interval, as shown in table 1, within 40% of EV vehicle types with the highest vehicle speed greater than 120km/h can be selected, the accelerator depth of 120km/h vehicle speed depends on product positioning and accelerator pedal comfort, pedal comfort in high speed driving needs to be considered in the Normal mode, most of the vehicle except for high speed (highway) driving needs to be satisfied in the ECO mode, a larger steady speed interval can be selected, and the vehicle can easily run at a constant speed, thereby achieving the economic purpose; a smaller stable vehicle speed interval can be selected in the Sport mode, the vehicle running speed is higher, and an accelerator pedal is more aggressive.
Accordingly, it may also be achieved by incorporating the current operation mode when determining the target motor driving power of the corresponding electric vehicle; as an example, it may be that, first, a current operation mode of the electric vehicle is acquired, for example, a current operation mode selected by a user operation is acquired; then, the speed-stabilizing accelerator power reference table is queried based on the current operating mode and the acquired accelerator opening information to determine the corresponding target motor driving power, for example, the speed corresponding to 20% of the accelerator depth in the ECU mode is 45km/h, and the speed corresponding to 20% of the accelerator depth in the Sport mode is 80km/h, which respectively correspond to different vehicle resistances, so that the motor driving powers corresponding to the uniform speed driving are also different (as shown in table 2).
TABLE 2 maximum power requirement at different depths
As shown in table 2, the shallow throttle intervals corresponding to the steady speeds in the ECO mode, the Normal mode, and the Sport mode are 10% to 50%, 10% to 40%, and 10% to 30%, respectively, and power is gradually released to accelerate in response to the throttle opening degree in the overspeed throttle interval after exceeding the shallow throttle interval.
The design process of the overtaking interval mainly relates to the design of the following parameters:
designing maximum torque, namely calculating the maximum hill-start capacity requirement of each mode of the vehicle, and finely adjusting the maximum hill-start capacity requirement by combining the comfort of the vehicle and matching with the torque loading rate; (Torque Loading Rate: amount of Torque Change per unit time)
Maximum power design-maximum value of vehicle in each mode of the following parameters is taken:
1)0-50, 0-100 acceleration time-maximum power;
2) 4%, 8%, 12% of the highest climbing speed-maximum power;
the maximum torque and the maximum power of the vehicle in each mode are determined and gradually released along with the increase of the depth of an accelerator pedal, the Sport mode can reach the maximum characteristic (such as 80% of accelerator depth full power) in advance according to the situation, and a specific accelerator curve needs actual calibration and correction.
It is understood that the arrangement of the accelerator pedal may be diversified, for example, the arrangement, the stroke, the pedal force and the like of the accelerator pedal are considered comprehensively. For example, a sports car usually adopts a floor type accelerator pedal, the pedal stroke is short, the pedal force is large, the design of the accelerator of the car type is usually radical, so that the required power effect can be obtained without stepping too deep and too hard, and the accelerator pedal is better controlled and has good pedal feeling by matching with larger pedal force; the common household vehicle adopts a suspension type accelerator pedal more, the accelerator stroke is long, the pedal force is small, but only the front sole of the pedal can exert force, the heel of the pedal falls on the floor, so that the problem of fatigue of legs and feet is easy to occur, and the pedal falls in the range which is not easy to generate fatigue feeling when an accelerator interval with stable vehicle speed is selected.
Therefore, in the embodiment of the invention, the design of the shallow accelerator needs to consider the requirement of stable vehicle speed, namely, the labor intensity of feet of a driver is reduced when the vehicle runs at a constant speed for a long time, namely, the accelerator does not need to be frequently adjusted to stabilize the vehicle speed, the driver does not need to step too deep and the like; and the deep accelerator is mainly used for releasing the power of the whole vehicle so as to realize overtaking acceleration.
As shown in fig. 4, a
In some embodiments, the accelerator opening of the electric vehicle includes a steady accelerator opening interval and an over-speed accelerator opening interval that is greater than the steady accelerator opening interval, wherein the motor drive power determining unit 402 includes: the speed stabilizing judgment module is used for judging whether the acquired accelerator opening information is in the speed stabilizing accelerator opening interval or not; and the motor power determining module is used for determining the target motor driving power corresponding to the acquired accelerator opening information based on the speed-stabilizing accelerator power reference table when the acquired accelerator opening information is in the speed-stabilizing accelerator opening interval.
In some embodiments, when the acquired accelerator opening information is not within the steady accelerator opening interval, the
In some embodiments, the electric vehicle is configured to have a plurality of operation modes, and different operation modes of the same accelerator opening information in the steady accelerator power reference table respectively correspond to different steady speeds and/or motor driving powers of the electric vehicle, wherein the motor driving power determining unit 402 includes: the mode acquisition module is used for acquiring the current working mode of the electric vehicle; and the mode power determination module is used for inquiring the speed-stabilizing accelerator power reference table based on the current working mode and the acquired accelerator opening information so as to determine the corresponding target motor driving power.
In some embodiments, the
For more details of the driving control system of the electric vehicle according to the embodiment of the present invention, reference may be made to the above description related to the embodiment of the driving control method of the electric vehicle, and the same or corresponding technical effects as those of the driving control method of the electric vehicle may be obtained, so that no further description is provided herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.