CN115139809A - Automobile control method and automobile - Google Patents
Automobile control method and automobile Download PDFInfo
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- CN115139809A CN115139809A CN202110337050.9A CN202110337050A CN115139809A CN 115139809 A CN115139809 A CN 115139809A CN 202110337050 A CN202110337050 A CN 202110337050A CN 115139809 A CN115139809 A CN 115139809A
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- 238000000034 method Methods 0.000 title claims abstract description 68
- 230000008569 process Effects 0.000 claims abstract description 34
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- 230000003068 static effect Effects 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 2
- 230000006870 function Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
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- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2009—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for braking
- B60L15/2018—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for braking for braking on a slope
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The embodiment of the invention provides a control method of an automobile and the automobile, wherein the control method comprises the following steps: acquiring current information of a vehicle; judging whether the current information of the vehicle meets a first preset condition or not; when the vehicle information does not meet preset conditions, the vehicle does not enter a slope slipping prevention mode; when the vehicle information meets preset conditions, entering a slope walking prevention mode and judging whether the current battery system has charging capacity; when the battery system has charging capacity, the battery system is charged by electric energy generated by the electric driving system in the anti-slope-sliding process; when the battery system does not have the charging capacity, the electric energy generated by the electric driving system in the slope slipping prevention process is consumed through the high-voltage accessory. The technical problem of safety risks caused by over-charging of the battery and damage of the battery due to the fact that the electric driving system can generate electric energy when the battery has no charging capacity in the electric automobile in the prior art in the process of preventing the battery from sliding down a slope is effectively solved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to an automobile control method and an automobile.
Background
In the prior manual transmission type, a user needs to prevent a vehicle from sliding down a slope by means of manual braking, braking and the like when the vehicle is stopped or started on a slope, and auxiliary functions of preventing the vehicle from sliding down the slope gradually appear along with the increasing electrification degree of the vehicle. At present, the most common auxiliary slope-slipping prevention functions such as HHC and automatic are that after a user steps on a brake to stop, an ESP system is used for keeping hydraulic braking force, so that the user can sufficiently respond to time to step on an accelerator to drive a vehicle, and the vehicle is prevented from slipping on a slope before power output.
However, with the development of electric vehicles, on one hand, for energy saving and on the other hand, for more convenient driving, some new functions such as single pedal technology have gradually broken the usage habits of users. For the single-pedal technology, especially the single-pedal technology capable of decelerating to zero, a user can realize acceleration, deceleration and even parking of a vehicle by only controlling an accelerator pedal, and after the user is used to the habit, even when the vehicle is parked, the brake pedal is rarely used, so that the auxiliary slope slipping prevention functions of HHC, autohold and the like cannot be activated, especially, the slope slipping risk can occur on a small slope where the slope is small and the human eyes judge that the small slope is a level road.
However, the inventor of the present application finds that the above-mentioned technology has at least the following technical problems in the process of implementing the technical solution of the invention in the embodiments of the present application.
The electric automobile in the prior art has the technical problems that when the battery has no charging capacity, an electric driving system can generate electric energy in the process of preventing the battery from sliding down a slope, and if the battery is directly charged, the battery is possibly overcharged to cause the safety risk of battery damage.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a control method for an electric vehicle, which is used to solve the technical problem of safety risk in the prior art that when a battery has no charging capability, an electric driving system generates electric energy during a process of preventing a vehicle from sliding down a slope, which may cause overcharge of the battery and damage of the battery.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a control method of an automobile, the control method comprising the steps of:
the control method comprises the following steps:
acquiring current information of a vehicle;
judging whether the current information of the vehicle meets a first preset condition or not;
when the vehicle information does not meet preset conditions, the vehicle does not enter a slope slipping prevention mode;
when the vehicle information meets preset conditions, entering a slope walking prevention mode and judging whether the current battery system has charging capacity;
when the battery system has charging capacity, the battery system is charged by electric energy generated by an electric driving system in the process of preventing the battery system from sliding down a slope;
when the battery system does not have the charging capacity, the electric energy generated by the electric driving system in the slope slipping prevention process is consumed through the high-voltage accessory.
Further, the current information of the vehicle comprises gear information, vehicle speed information, information of a brake pedal and an accelerator pedal and acceleration direction information;
the first preset condition is as follows: when the vehicle is in a running gear, the brake pedal and the accelerator pedal are released, the vehicle speed is within 3km/h, and the direction of acceleration is opposite to the direction of the gear.
Further, whether the battery system has a charging capability is specifically:
when the electric quantity of the battery system is lower than a threshold value, the battery system has charging capacity;
when the amount of electricity of the battery system is higher than or equal to the threshold, the battery system does not have the charging capability.
Further, after entering the anti-walking-slope mode, the method further comprises:
the electric drive system enters a null control mode to stop the vehicle on the slope through closed-loop control
The zero control mode is used for controlling the motor of the electric drive system to output the hill-holding torque so that the vehicle stops on the slope.
Further, in the null control mode, the lower limit of the hill-holding torque output by the motor of the electric drive system is the difference between the hill force received by the vehicle and the maximum static friction force of the vehicle, and the upper limit of the hill-holding torque is the sum of the hill force received by the vehicle and the maximum static friction force of the vehicle.
Further, the electric drive system entering the null control mode further comprises:
acquiring the temperature of an electric drive system;
judging whether the temperature of the electric drive system reaches a power reduction interval or not;
and when the electric drive system reaches the power reduction interval, starting the electronic parking system to brake the vehicle and exiting the zero control mode.
Further, the electric drive system entering the zero control mode further comprises:
acquiring the maximum torque capacity of an electric drive system;
determining whether a maximum torque capacity of the electric drive system is below a hill holding valve value,
when the maximum torque capacity of the electric drive system is lower than the hill-holding valve value, the electronic parking system is started to brake the vehicle and the electric drive system exits the zero position control mode.
Further, the hill-holding valve value is specifically the sum of the maximum hill-holding force of the vehicle and a preset safety margin.
Further, the high voltage accessories include a vehicle air conditioner and a vehicle heater.
An embodiment of the present invention also provides an automobile, including:
an electric drive system;
a battery system;
a high voltage accessory;
and the vehicle control unit is respectively and electrically connected with the electric driving system, the battery system and the high-voltage accessory and is used for executing the control method of the vehicle.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the control method of the automobile provided by the embodiment of the invention comprises the following steps: acquiring current information of a vehicle; judging whether the current information of the vehicle meets a first preset condition or not; when the vehicle information does not meet preset conditions, the vehicle does not enter a slope slipping prevention mode; when the vehicle information meets preset conditions, entering a slope walking prevention mode and judging whether the current battery system has charging capacity; when the battery system has charging capacity, the battery system is charged by electric energy generated by an electric driving system in the process of preventing the battery system from sliding down a slope; when the battery system does not have the charging capacity, the electric energy generated by the electric driving system in the slope slipping prevention process is consumed through the high-voltage accessory. Through the process that gets into the mode of preventing swift current slope and summarizing, detect the charging capacity who judges battery system, do not possess the charging capacity, battery system need not charge promptly, if still charge to battery system and probably lead to the battery overcharges, cause battery system's damage, therefore, consume the electric energy that the system produced of driving electrically through making the high-voltage accessory that uses in the car to the realization to the protection of battery, solve effectively to exist when the battery does not have the charging capacity among the electric automobile among the prior art, when preventing the in-process of swift current slope, the system of driving electrically can produce the electric energy, probably leads to the battery to overcharge, cause the technical problem of the safe risk of battery damage.
In addition, an embodiment of the present invention also provides an automobile, including: an electric drive system; a battery system; a high voltage accessory; a vehicle control unit, which is electrically connected to the electric drive system, the battery system and the high-voltage accessory, respectively, and is used to carry out the control method of the motor vehicle according to any one of claims 1 to 9. The technical problem of safety risks caused by over-charging of the battery and damage of the battery due to the fact that the electric driving system can generate electric energy when the battery has no charging capacity in the electric automobile in the prior art in the process of preventing the battery from sliding down a slope is effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling a vehicle according to an embodiment of the present invention;
FIG. 2 is an analysis chart of motor driving force, speed and time at four stages in a control method for an automobile according to an embodiment of the present invention;
FIG. 3 is an analysis chart of motor driving force and vehicle speed in a control method of an automobile according to an embodiment of the present invention;
fig. 4 is a block diagram of an automobile according to an embodiment of the present invention.
Wherein:
100. a vehicle control unit; 200. an electric drive system; 300. a high voltage accessory; 400. a battery system; 500. an electronic parking system.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the vehicle or the element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 is a flowchart of a control method for a vehicle according to an embodiment of the present invention;
as shown in fig. 1, the present embodiment provides a control method of an automobile, including the steps of:
acquiring current information of a vehicle;
the current information of the vehicle comprises gear information, speed information, information of a brake pedal and an accelerator pedal and acceleration direction information;
judging whether the current information of the vehicle meets a first preset condition or not;
wherein the first preset condition is as follows: when the vehicle is in a running gear, the brake pedal and the accelerator pedal are released, the vehicle speed is within 3km/h, and the direction of acceleration is opposite to the direction of the gear.
When the vehicle information does not meet preset conditions, the vehicle does not enter a slope slipping prevention mode;
when the vehicle information meets preset conditions, entering a slope walking prevention mode and judging whether the current battery system 400 has charging capacity;
the ECU of the vehicle enters the anti-landslide mode to obtain the charging capability information of the battery system 400, and the charging capability can be determined by the electric quantity of the battery, so as to determine the charging capability of the battery system 400.
When the battery system 400 has the charging capability, the battery system 400 is charged by the electric power generated by the electric driving system 200 in the anti-slope-slipping process;
when the battery system 400 does not have the charging capability, the electric power generated by the electric drive system 200 during the landslide prevention process is consumed by the high-voltage accessory 300.
Wherein, still include after entering into prevent walking a slope mode:
The null control mode is to control the output torque of the electric motor of the electric drive system 200 to stop the vehicle on the slope.
In the null control mode, the lower limit of the hill-holding torque F output by the electric machine of the electric drive system 200 is the difference between the hill force received by the vehicle and the maximum static friction force of the vehicle, and the upper limit of the hill-holding torque is the sum of the hill force received by the vehicle and the maximum static friction force of the vehicle. The ECU controls the hill-holding torque output by the motor of the electric driving system 200 to be between the upper limit and the lower limit in the hill-falling prevention mode, so that the vehicle can stably stop on a slope, and in the process of falling the slope, the electric driving system 200 enters the zero position control mode to control the motor, as same as the principle of the hill-falling prevention, so that the vehicle can be kept stably parked in the process of falling the slope on a small slope.
The electric drive system 200 can balance the slope force and the maximum static friction force by the slope-parking torque output by the motor, so that the vehicle can stably stop on a slope, the functions of preventing forward sliding and backward sliding can be realized, and meanwhile, the slope parking is stable without slope sliding basically.
The high-voltage accessories 300 include components that can consume power on the vehicle, such as a vehicle-mounted air conditioner and a vehicle-mounted heater;
after the ECU enters the anti-creep mode, the electric drive system 200 controls the output torque of the motor to make the electric drive system 200 brake on a slope, and generally, a parking torque larger than the sum of the slope force and the maximum static friction is firstly applied to prevent the vehicle from sliding down, at this time, the electric drive system 200 recovers electric energy to generate electric quantity, and if the battery system 400 is directly charged with the electric quantity, the problem of battery overcharge may be caused, and the battery system 400 is damaged; therefore, the charging capability of the battery system 400 needs to be determined, and when the battery system 400 has the charging capability, the battery system 400 is charged by the electric driving system 200 during the anti-creep process, and at this time, the battery system 400 is normally charged without being damaged; when the battery system 400 does not have the charging capability, the battery system 400 cannot be directly charged, otherwise the battery system 400 is damaged, so that the electric power generated by the electric drive system 200 in the anti-creep mode needs to be consumed by the high-voltage accessories 300, for example, by starting the high-voltage accessories 300, such as an on-board air conditioner or an on-board heater.
Wherein, the first and the second end of the pipe are connected with each other, whether the battery system 400 has the charging capability is specifically as follows:
when the electric quantity of the battery system 400 is lower than the threshold value, the battery system 400 has the charging capability;
when the amount of power of the battery system 400 is greater than or equal to the threshold value, the battery system 400 does not have the charging capability.
For example: the threshold is 80%, and when the electric quantity of the battery system 400 is lower than 80%, the battery system 400 is considered to have the charging capability, i.e., to be charged, i.e., the electric energy generated by the electric driving system 200 during the anti-slope-slipping process can charge the battery system 400.
When the electric quantity of the battery system 400 is higher than or equal to 80%, the battery system 400 is considered to have no charging capability, that is, the battery system 400 cannot be charged, that is, the electric power generated by the electric driving system 200 during the anti-slope-slipping process cannot charge the battery system 400, and the electric power generated by the electric driving system 200 during the anti-slope-slipping process is consumed by starting the high-voltage accessory 300, so that the problem that the battery system 400 is overcharged, which causes a safety risk to the battery, is avoided.
When the ECU enters the anti-slope-slipping mode, the electric drive system 200 enters a zero-position control mode, the motor is controlled to output a stable preset slope-slipping torque, so that the vehicle stably stops on a slope, the electric drive system 200 blocks the slope for a long time, the temperature of the motor is increased, the motor is thermally disabled, namely the electric drive system 200 lowers the power of the motor, the motor cannot continuously provide an effective slope-slipping torque for the vehicle, and the vehicle may slip backwards or forwards;
the electric drive system 200 further includes, after entering the null control mode:
acquiring the temperature of the electric drive system 200; the temperature of the electric drive system 200 may be a temperature of the electric machine;
determining temperature of electric drive system 200 whether the power reduction interval is reached;
when electric drive system 200 reaches the derated power interval, then electronic parking system 500 is activated to brake the vehicle and electric drive system 200 exits the null control mode.
Through whether the temperature of the electric drive system 200 reaches the power reduction interval or not, the electric drive system 200 can reduce the power of the motor when the motor reaches a certain temperature; therefore, the motor cannot continuously provide effective slope-parking torque for the vehicle, and the vehicle may slide backwards or forwards; thus, when the electric drive system 200 reaches the derated interval, the vehicle is braked by activating the electronic parking system 500 and the electric drive system 200 exits the null control mode; therefore, the ability of the electric drive system 200 can be considered, meanwhile, the situation that the motor of the electric drive system 200 is in a long-time locked-up slope state and before a thermal failure scene occurs is considered, the vehicle can be automatically switched to the electronic parking system 500 of the brake system in advance to park on the slope, after the electronic parking system 500 is locked, the vehicle controller 100 requests the motor system to push out a zero position mode, the vehicle can be stably parked on the slope for a long time through the electronic parking system 500, the switching process is consistent, and the phenomenon of slope slipping does not occur.
In addition, the electric drive system 200 further includes, after entering the null control mode:
acquiring the maximum torque capacity of the electric drive system 200; the maximum torque capacity of the electric drive system 200 is the maximum torque output by the motor;
determining if the maximum torque capacity of the electric drive system 200 is below the hill holding valve value,
when the maximum torque capacity of the electric drive system 200 is lower than the hill-holding valve value, the electronic parking system 500 is started to brake the vehicle and the electric drive system 200 exits the null control mode.
The slope-stopping valve value is specifically the sum of the maximum slope-stopping force of the vehicle and a preset safety margin. The maximum hill-holding force of the vehicle is the maximum hill-holding torque required by the electric drive system 200 to stably perform hill holding under a predetermined condition, and the preset safety margin is added to increase safety so as to prevent the vehicle from directly slipping down a slope when the maximum hill-holding force is lower than the maximum hill-holding force.
Since the electric drive system 200 will perform power reduction when the motor is overheated, which results in the maximum torque capacity of the electric drive system 200 decreasing, when the maximum torque capacity decreases below the hill-holding valve value, the vehicle may slip, and at this time, the vehicle is braked by starting the electronic parking system 500 and the electric drive system 200 exits the null control mode, so as to ensure that the vehicle does not slip. The capability of the electric drive system 200 can be considered, the situation that the electric motor of the electric drive system 200 is in a state of blocking, rotating and parking for a long time and before a thermal failure scene occurs is considered, the electric drive system can be automatically switched to the electronic parking system 500 of the brake system in advance to park on the slope, after the electronic parking system 500 is locked, the vehicle controller 100 requests the electric motor system to push out a zero position mode, the vehicle can be stably parked on the slope for a long time through the electronic parking system 500, the switching process is consistent, and the phenomenon of slope slipping does not occur.
The anti-slip process can be divided into four stages as follows: as shown in fig. 2, wherein the motor driving force in fig. 2 is standing wave torque.
Stage 1: during the process that the vehicle runs up a slope, the vehicle starts to decelerate after the driver releases the accelerator, and in the process, the vehicle controller 100 judges whether the vehicle needs to enter a slope slipping prevention mode or not according to the vehicle speed signal, the gear signal and the gradient signal by combining the depth of the brake pedal and the depth of the accelerator pedal.
And (2) stage: after entering the anti-roll mode, the electric drive system 200 enters the zero position control mode from the torque control mode, and the vehicle is stably stopped on the slope through closed-loop control, as shown in fig. 3, when the torque output by the electric drive system is between the preset upper and lower limits of the hill-holding torque F, the vehicle can be stably stopped on the slope. During the downhill process, the vehicle can be stably parked during the downhill process on a small slope by the zero control mode of the electric drive system 200, which is the same as the above-mentioned anti-slip principle.
And (3) stage: the electric drive system 200 remains in the null control mode, maintaining the parking torque output at the previous time and the vehicle is stationary on the grade.
And (4) stage: when the electric drive system 200 blocks the parking slope for a long time and the temperature of the motor rises, it is recognized that the temperature of the electric drive system 200 reaches a power reduction interval or the maximum torque capacity of the electric drive system 200 is lower than a parking slope valve value, that is, before thermal failure, the vehicle controller 100 requests the electronic parking system 500 to work in advance, after the electronic parking system 500 is locked, the vehicle controller 100 requests the motor system to push out a zero position mode, and the vehicle can stably park on the slope for a long time through the electronic parking system 500.
Therefore, the functions of preventing forward sliding and backward sliding are realized simultaneously, and meanwhile, the slope is stably kept without the phenomenon of sliding on the slope basically.
As shown in fig. 4, the present embodiment further provides an automobile, which includes:
the electric drive system 200; the electric drive system 200 is used to power an automobile;
a battery system 400; the battery system 400 is used for storing electric energy required by the whole vehicle and supplying power to each system component of the vehicle.
A high voltage accessory 300; the high-voltage accessory 300 includes components capable of consuming electric power, such as the vehicle air conditioner and the vehicle heater, as described above in the control method.
The vehicle control unit 100 is electrically connected with the electric drive system 200, the battery system 400 and the high-voltage accessory 300 respectively, and is used for executing the control method of the automobile.
The vehicle control unit 100 is an ECU, and performs information interaction to the electric driving system 200, the battery system 400 and the high-voltage accessory 300 through CAN buses respectively; the ECU receives a vehicle speed signal, a gradient signal and a gear signal.
The vehicle further comprises an electronic parking system 500, and the vehicle controller 100 exchanges information with the electronic parking system 500 through a CAN bus;
in the process of thermal failure of the motor, hill parking is performed through the electronic parking system 500, the capability of the electric drive system 200 can be considered, meanwhile, the situation that the motor of the electric drive system 200 is in a long-time locked-rotating hill parking state is considered, before a scene of thermal failure occurs, the electronic parking system 500 of the brake system can be automatically switched to in advance to park on the hill, after the electronic parking system 500 is locked, the vehicle controller 100 requests the motor system to push out a zero position mode, the vehicle can stably stop on the hill for a long time through the electronic parking system 500, the switching process is consistent, and the phenomenon of slope slipping does not occur.
The embodiment of the invention also provides an automobile, which can effectively solve the technical problem that in the process of preventing a vehicle from sliding down a slope when the battery has no charging capacity, the electric driving system 200 can generate electric energy, and the battery can be overcharged to cause the safety risk of damaging the battery in the electric automobile in the prior art.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the system, the vehicle and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, vehicle and method may be implemented in other ways. For example, the above-described embodiments of the vehicle are merely illustrative, and for example, the division of the units is merely a logical division, and the actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection of automobiles or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A control method of an automobile, characterized by comprising the steps of:
acquiring current information of a vehicle;
judging whether the current information of the vehicle meets a first preset condition or not;
when the vehicle information does not meet preset conditions, the vehicle does not enter a slope slipping prevention mode;
when the vehicle information meets preset conditions, entering a slope walking prevention mode and judging whether the current battery system has charging capacity;
when the battery system has charging capacity, the battery system is charged by electric energy generated by an electric driving system in the process of preventing the battery system from sliding down a slope;
when the battery system does not have the charging capacity, the electric energy generated by the electric driving system in the slope sliding prevention process is consumed through the high-voltage accessory.
2. The control method of an automobile according to claim 1,
the current information of the vehicle comprises gear information, speed information, information of a brake pedal and an accelerator pedal and acceleration direction information;
the first preset condition is as follows: when the vehicle is in a running gear, the brake pedal and the accelerator pedal are released, the vehicle speed is within 3km/h, and the direction of acceleration is opposite to the direction of the gear.
3. The method for controlling an automobile according to claim 1, wherein whether the battery system has a charging capability is specifically:
when the electric quantity of the battery system is lower than a threshold value, the battery system has charging capacity;
when the amount of electricity of the battery system is higher than or equal to the threshold, the battery system does not have the charging capability.
4. The control method of an automobile according to claim 1, further comprising, after entering the anti-walk-hill mode:
the electric drive system enters a null control mode to stop the vehicle on the slope through closed-loop control
The zero control mode is used for controlling the motor of the electric drive system to output the hill-holding torque so that the vehicle stops on the slope.
5. The method of claim 4, wherein in the null control mode, the electric machine of the electric drive system outputs a hill holding torque having a lower limit of a difference between a hill force experienced by the vehicle and a maximum static friction force of the vehicle and an upper limit of a hill holding torque of a sum of the hill force experienced by the vehicle and the maximum static friction force of the vehicle.
6. The method as set forth in claim 4, wherein said electric drive system entering the null control mode further comprises:
acquiring the temperature of an electric drive system;
judging whether the temperature of the electric drive system reaches a power reduction interval or not;
when the electric drive system reaches the power reduction interval, the electronic parking system is started to brake the vehicle, and the electric drive system exits the zero control mode.
7. The method as set forth in claim 4, wherein said electric drive system entering the null control mode further comprises:
acquiring the maximum torque capacity of an electric drive system;
determining whether a maximum torque capacity of the electric drive system is below a hill holding valve value,
when the maximum torque capacity of the electric drive system is lower than the hill-holding valve value, the electronic parking system is started to brake the vehicle and the electric drive system exits the zero position control mode.
8. The method as claimed in claim 7, wherein the hill-holding valve value is a sum of a maximum hill-holding force of the vehicle and a preset safety margin.
9. The control method of an automobile according to claim 1, wherein the high-voltage accessories include an on-vehicle air conditioner and an on-vehicle heater.
10. An automobile, characterized in that the automobile comprises:
an electric drive system;
a battery system;
a high voltage accessory;
a vehicle control unit, which is electrically connected to the electric drive system, the battery system and the high-voltage accessory, respectively, and is used to carry out the control method of the motor vehicle according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110337050.9A CN115139809A (en) | 2021-03-29 | 2021-03-29 | Automobile control method and automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110337050.9A CN115139809A (en) | 2021-03-29 | 2021-03-29 | Automobile control method and automobile |
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| CN115139809A true CN115139809A (en) | 2022-10-04 |
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| CN202110337050.9A Pending CN115139809A (en) | 2021-03-29 | 2021-03-29 | Automobile control method and automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114248630A (en) * | 2020-09-23 | 2022-03-29 | 广汽埃安新能源汽车有限公司 | Anti-slope-sliding parking control method of electric automobile, whole automobile controller and medium |
-
2021
- 2021-03-29 CN CN202110337050.9A patent/CN115139809A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114248630A (en) * | 2020-09-23 | 2022-03-29 | 广汽埃安新能源汽车有限公司 | Anti-slope-sliding parking control method of electric automobile, whole automobile controller and medium |
| CN114248630B (en) * | 2020-09-23 | 2024-04-19 | 广汽埃安新能源汽车有限公司 | Anti-slip parking control method for electric automobile, whole vehicle controller and medium |
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