CN106740268A - A kind of pure electric automobile max. speed method for limiting speed - Google Patents
A kind of pure electric automobile max. speed method for limiting speed Download PDFInfo
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- CN106740268A CN106740268A CN201710073991.XA CN201710073991A CN106740268A CN 106740268 A CN106740268 A CN 106740268A CN 201710073991 A CN201710073991 A CN 201710073991A CN 106740268 A CN106740268 A CN 106740268A
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- speed
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- design maximum
- rotating speed
- maximum
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Classifications
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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
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/421—Speed
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a kind of pure electric automobile max. speed method for limiting speed, comprise the following steps：S1, setting max. speed and system of vehicle transmission coefficient obtain the corresponding relation of motor speed and speed；S2, corresponding design maximum motor speed under design maximum speed is obtained, corresponding torque value under maximum motor speed is obtained by motor external characteristic curve；S3, when motor speed is close to design maximum rotating speed, requested torque is gradually reduced, until requested torque is reduced into 0 when more than design maximum rotating speed.The present invention realizes the limitation to vehicle maximum speed by designing maximum motor speed.Torque mode is set, by way of progressively dropping moment of torsion, vehicle is maintained near maximum limit rotating speed interval.The risk breakdown so as to greatly reduce electric machine controller IGBT module, also reduces the risk of Motor Over Speed, improves the safety coefficient of vehicle.
Description
Technical field
The invention belongs to field of automobile brake, and in particular to a kind of pure electric automobile max. speed method for limiting speed.
Background technology
Usual pure electric automobile is by entire car controller (VCU) according to the current state of vehicle to electric machine controller (MCU)
Control signal is sent, so as to realize the control to motor.This kind of mode can be realized accelerating pure electric automobile, slow down, climbing
Etc. the control under various working conditions.
The current general maximum speed without limitation on vehicle of pure electric automobile.Entire car controller is according to motor external characteristic curve
Corresponding torque under motor different rotating speeds is obtained, then is intended to be sent to MCU further according to real-time vehicle condition and driver's operation
Request torque.Generally when motor is in rotating speed high, external characteristic curve has corresponded to a torque for very little.It is in yet with vehicle
Often a driving moment for very little can also overcome resistance to drive vehicle to advance during speed high.If driver does not take now and arranges
Apply, vehicle can continue to accelerate, and make overspeed of vehicle.
Consider specific condition, do not take speed limit to there is following security risk：
1st, mean that motor is in the pattern for running at high speed when vehicle is in runs at high speed.When vehicle be in one it is long under
During the road conditions on slope, if now the non-release the gas pedal of driver does not do any brake measure yet, vehicle can continue to accelerate.Cause electricity
There is hypervelocity, or even risk out of control in machine.
2nd, when motor is in rotating speed high, if there is abnormal (such as high voltage connector disconnection, high-tension connector in high tension loop
Come off), if now driver's brake pedal, motor braking is produced and recovered energy.But because high tension loop has disconnected, reclaim
Energy cannot feed back to electrokinetic cell, the electric capacity that energy can be constantly toward electric machine controller (MCU) is assembled.Cause electric machine controller
IGBT module is breakdown.
The content of the invention
It is an object of the invention to provide a kind of pure electric automobile max. speed method for limiting speed, it is mainly used in limitation pure electronic
Automobile max. speed, improves safety coefficient of the pure electric automobile when running at high speed with descending.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of pure electric automobile max. speed method for limiting speed, comprises the following steps：
S1, setting max. speed and system of vehicle transmission coefficient obtain the corresponding relation of motor speed and speed；
S2, corresponding design maximum motor speed under design maximum speed is obtained, maximum is obtained by motor external characteristic curve
Corresponding torque value under motor speed；
S3, VCU gradually reduce requested torque when motor speed is close to design maximum rotating speed, are set until more than maximum
Requested torque is reduced to 0 during the 100r/min of metering rotating speed.
The requested torque value that MCU is received when reaching design maximum rotating speed due to motor is 0, and motor can not continue to accelerate, from
And reached the purpose of limitation max. speed.
In the step S1, the corresponding relation of motor speed and speed is：
In formula, V1 is speed, and R is tire radius, and V2 is motor speed, and I is base ratio.
Step S4 is also performed while step S3 is performed, step S5 is then performed；
S4, when motor speed reaches design maximum rotating speed, MCU no longer responds the moment of torsion of VCU transmissions, and motor enters rotating speed
Pattern；
S5, when Motor Over Speed, MCU is slowed down by way of dropping moment of torsion.
After step S5 is performed, if motor still exceeds the speed limit, MCU takes the mode of output negative torque to reduce motor speed.
Can realize for motor speed stabilization maintaining design maximum rotating speed with reference to drop moment of torsion and the mode for subtracting moment of torsion.
In step s 4, rotating speed pattern is entered when following condition is met：
A, motor speed reach design maximum rotating speed and requested torque is more than certain value；
Rotating speed pattern is exited when following either condition is met：
I, motor speed are less than design maximum rotating speed；
Ii, driver's brake pedal；
Iii, driver's release the gas pedal.
Compared with prior art, the invention has the advantages that：
The advantage of the invention is that by designing maximum motor speed, realizing the limitation to vehicle maximum speed, it is ensured that electricity
Machine is operated under limitation rotating speed interval.The present invention sets torque mode, by way of progressively dropping moment of torsion, vehicle is maintained most
Near height limitation rotating speed interval；Rotating speed pattern is set, according to motor speed size is judged, by dropping moment of torsion or exporting negative torque
Mode maintains motor operation interval in highest design speed.It is breakdown so as to greatly reduce electric machine controller IGBT module
Risk, also reduces the risk of Motor Over Speed, improves the safety coefficient of vehicle.
Brief description of the drawings
Fig. 1 is the entrance rotating speed pattern and the decision flow chart for exiting rotating speed pattern of the present invention-embodiment.
Specific embodiment
With reference to embodiment and accompanying drawing, the invention will be further described, and embodiments of the present invention are included but is not limited to
The following example.
The working condition of pure electric automobile miscellaneous part is not considered, and for drive control, the drive control of vehicle is main
It is to be cooperated completion by entire car controller (VCU) and electric machine controller (MCU).Entire car controller by gather gear information,
Accelerator pedal, brake pedal aperture judge driver intention, and current vehicle is judged by gathering power battery information, fault message etc.
Condition.Electric machine controller judges motor present case by gathering the information such as motor speed, motor bus current.Then according to motor
The torque that correspondence motor can be exported under external characteristic curve, i.e. different rotating speeds, obtains external characteristics torque value.Entire car controller is again
The torque value is multiplied by the coefficients such as accelerator pedal, motor speed, requested torque is obtained, then the requested torque is sent into motor control
Device.Actual torque is calculated by electric machine controller, motor is controlled, so as to realize that VCU, MCU jointly control vehicle fortune
OK.
From principle above and motor external characteristics, in rotating speed high, VCU can send a request power to motor to motor
Square.The torque can drive vehicle persistently to accelerate in motor high speed.
Embodiment
As shown in figure 1, a kind of pure electric automobile max. speed method for limiting speed, comprises the following steps：
S1, setting max. speed and system of vehicle transmission coefficient obtain the corresponding relation of motor speed and speed, i.e.,：
In formula, V1 is speed, and R is tire radius, and V2 is motor speed, and I is base ratio.
S2, corresponding design maximum motor speed under design maximum speed is obtained by the formula of step S1, it is outer special by motor
Linearity curve obtains corresponding torque value under maximum motor speed.
S3, VCU are calculated according to vehicle condition, when motor speed is close to design maximum rotating speed, gradually reduce requested torque, until
Requested torque is reduced to 0 in the 100r/min more than design maximum rotating speed.
The requested torque value that MCU is received when reaching design maximum rotating speed due to motor is 0, and motor can not continue to accelerate, from
And reached the purpose of limitation max. speed.
Further, step S4 is performed while step S3 is performed：When motor speed reaches design maximum rotating speed,
MCU no longer responds the moment of torsion of VCU transmissions, and motor enters rotating speed pattern, then performs S5.
S5, when Motor Over Speed, MCU is slowed down by way of dropping moment of torsion, if motor still exceeds the speed limit, MCU can be further
Taking the mode of output negative torque reduces motor speed.Can be realized with reference to drop moment of torsion and the mode for subtracting moment of torsion motor speed is steady
Fixed maintains design maximum rotating speed.
Enter rotating speed pattern when following condition is met：
A, motor speed reach design maximum rotating speed and requested torque is more than certain value.
Rotating speed pattern is exited when following either condition is met：
I, motor speed are less than design maximum rotating speed；
Ii, driver's brake pedal；
Iii, driver's release the gas pedal.
Limitation to the maximum (top) speed of motor can be realized by both the above mode.
According to above-described embodiment, the present invention just can be well realized.What deserves to be explained is, before said structure design
Put, to solve same technical problem, even if some made in the present invention are used without substantial change or polishing
Technical side's invention essence still as the present invention, therefore it should also be as within the scope of the present invention.
Claims (5)
1. a kind of pure electric automobile max. speed method for limiting speed, it is characterised in that comprise the following steps：
S1, setting max. speed and system of vehicle transmission coefficient obtain the corresponding relation of motor speed and speed；
S2, corresponding design maximum motor speed under design maximum speed is obtained, maximum motor is obtained by motor external characteristic curve
Corresponding torque value under rotating speed；
S3, VCU gradually reduce requested torque when motor speed is close to design maximum rotating speed, turn until more than design maximum
Requested torque is reduced to 0 during the 100r/min of speed.
2. a kind of pure electric automobile max. speed method for limiting speed according to claim 1, it is characterised in that the step S1
In, the corresponding relation of motor speed and speed is：
In formula, V1 is speed, and R is tire radius, and V2 is motor speed, and I is base ratio.
3. a kind of pure electric automobile max. speed method for limiting speed according to claim 1, it is characterised in that performing step
Step S4 is also performed while S3, step S5 is then performed；
S4, when motor speed reaches design maximum rotating speed, MCU no longer respond VCU transmission moment of torsion, motor enter rotating speed mould
Formula；
S5, when Motor Over Speed, MCU is slowed down by way of dropping moment of torsion.
4. a kind of pure electric automobile max. speed method for limiting speed according to claim 3, it is characterised in that performing step
After S5, if motor still exceeds the speed limit, MCU take output negative torque mode reduce motor speed.
5. a kind of pure electric automobile max. speed method for limiting speed according to claim 3, it is characterised in that in step S4
In, rotating speed pattern is entered when following condition is met：
A, motor speed reach design maximum rotating speed and requested torque is more than certain value；
Rotating speed pattern is exited when following either condition is met：
I, motor speed are less than design maximum rotating speed；
Ii, driver's brake pedal；
Iii, driver's release the gas pedal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710073991.XA CN106740268A (en) | 2017-02-10 | 2017-02-10 | A kind of pure electric automobile max. speed method for limiting speed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710073991.XA CN106740268A (en) | 2017-02-10 | 2017-02-10 | A kind of pure electric automobile max. speed method for limiting speed |
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| CN106740268A true CN106740268A (en) | 2017-05-31 |
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| CN201710073991.XA Pending CN106740268A (en) | 2017-02-10 | 2017-02-10 | A kind of pure electric automobile max. speed method for limiting speed |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107310428A (en) * | 2017-06-14 | 2017-11-03 | 北京新能源汽车股份有限公司 | Control method and device based on electric vehicle |
| CN107539300A (en) * | 2017-08-30 | 2018-01-05 | 北京新能源汽车股份有限公司 | Braking method, device, controller and the electric automobile of remote driving electric automobile |
| CN108058617A (en) * | 2017-12-01 | 2018-05-22 | 北京新能源汽车股份有限公司 | A kind of processing method of Motor Over Speed, entire car controller and automobile |
| CN109687810A (en) * | 2018-12-19 | 2019-04-26 | 上海伊控动力系统有限公司 | A kind of pure electric vehicle logistic car prevents the method for controlling number of revolution of Motor Over Speed |
| CN110884361A (en) * | 2019-12-02 | 2020-03-17 | 武汉理工通宇新源动力有限公司 | Speed limiting method of new energy automobile driving motor and motor driver thereof |
| CN111137138A (en) * | 2019-09-12 | 2020-05-12 | 苏州奥易克斯汽车电子有限公司 | Electric automobile speed limit control method |
| CN112498125A (en) * | 2020-12-08 | 2021-03-16 | 智新控制系统有限公司 | Four-wheel drive power control system, method and storage medium |
| CN112590550A (en) * | 2020-12-28 | 2021-04-02 | 中通客车控股股份有限公司 | Fuzzy processing control method and system for limiting maximum speed of pure electric passenger car |
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| US6313592B1 (en) * | 1998-05-09 | 2001-11-06 | Zf Friedrichshafen Ag | Method for controlling a motor vehicle having an electric drive mechanism |
| JP3985550B2 (en) * | 2002-02-28 | 2007-10-03 | アイシン・エィ・ダブリュ株式会社 | Electric vehicle drive control device, electric vehicle drive control method, and program thereof |
| CN103895530A (en) * | 2012-12-27 | 2014-07-02 | 上海大郡动力控制技术有限公司 | Speed limiting strategy of vehicle-mounted motor control system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6313592B1 (en) * | 1998-05-09 | 2001-11-06 | Zf Friedrichshafen Ag | Method for controlling a motor vehicle having an electric drive mechanism |
| JP3985550B2 (en) * | 2002-02-28 | 2007-10-03 | アイシン・エィ・ダブリュ株式会社 | Electric vehicle drive control device, electric vehicle drive control method, and program thereof |
| CN103895530A (en) * | 2012-12-27 | 2014-07-02 | 上海大郡动力控制技术有限公司 | Speed limiting strategy of vehicle-mounted motor control system |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107310428A (en) * | 2017-06-14 | 2017-11-03 | 北京新能源汽车股份有限公司 | Control method and device based on electric vehicle |
| CN107310428B (en) * | 2017-06-14 | 2019-11-22 | 北京新能源汽车股份有限公司 | Control method and device based on electric vehicle |
| CN107539300A (en) * | 2017-08-30 | 2018-01-05 | 北京新能源汽车股份有限公司 | Braking method, device, controller and the electric automobile of remote driving electric automobile |
| CN107539300B (en) * | 2017-08-30 | 2019-11-12 | 北京新能源汽车股份有限公司 | Braking method, device, controller and the electric car of remote driving electric car |
| CN108058617A (en) * | 2017-12-01 | 2018-05-22 | 北京新能源汽车股份有限公司 | A kind of processing method of Motor Over Speed, entire car controller and automobile |
| CN109687810A (en) * | 2018-12-19 | 2019-04-26 | 上海伊控动力系统有限公司 | A kind of pure electric vehicle logistic car prevents the method for controlling number of revolution of Motor Over Speed |
| CN109687810B (en) * | 2018-12-19 | 2021-04-09 | 上海伊控动力系统有限公司 | Rotating speed control method for preventing motor overspeed of pure electric vehicle |
| CN111137138A (en) * | 2019-09-12 | 2020-05-12 | 苏州奥易克斯汽车电子有限公司 | Electric automobile speed limit control method |
| CN110884361A (en) * | 2019-12-02 | 2020-03-17 | 武汉理工通宇新源动力有限公司 | Speed limiting method of new energy automobile driving motor and motor driver thereof |
| CN112498125A (en) * | 2020-12-08 | 2021-03-16 | 智新控制系统有限公司 | Four-wheel drive power control system, method and storage medium |
| CN112590550A (en) * | 2020-12-28 | 2021-04-02 | 中通客车控股股份有限公司 | Fuzzy processing control method and system for limiting maximum speed of pure electric passenger car |
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| PB01 | Publication | ||
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Application publication date: 20170531 |