CN107234984B - Four-wheel drive automatic switching system of electric vehicle - Google Patents
Four-wheel drive automatic switching system of electric vehicle Download PDFInfo
- Publication number
- CN107234984B CN107234984B CN201710446946.4A CN201710446946A CN107234984B CN 107234984 B CN107234984 B CN 107234984B CN 201710446946 A CN201710446946 A CN 201710446946A CN 107234984 B CN107234984 B CN 107234984B
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- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000001934 delay Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- B60L15/32—Control or regulation of multiple-unit electrically-propelled vehicles
-
- 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
- B60L15/32—Control or regulation of multiple-unit electrically-propelled vehicles
- B60L15/38—Control or regulation of multiple-unit electrically-propelled vehicles with automatic control
-
- 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
-
- 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
- B60L2260/00—Operating Modes
- B60L2260/20—Drive modes; Transition between modes
- B60L2260/26—Transition between different drive modes
-
- 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
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/44—Control modes by parameter estimation
-
- 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
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model discloses an automatic four-wheel drive switching system of an electric vehicle, and belongs to the technical field of vehicles. The utility model comprises a power transmission driving part and a detection control part, wherein the detection control part consists of a switching control unit, a front motor controller, a rear motor controller, an accelerator and a vehicle speed sensor arranged on front and rear wheels, the switching control unit carries out algorithm on the received front and rear wheel speeds and sends out instructions, and the vehicle driving wheels are switched according to the wheel slip condition to drive the vehicle to be separated from a slip road surface, so that the operation of a driver is not interfered, the implementation difficulty is low, the cost is low, the driving safety of the all-terrain four-wheel drive vehicle can be effectively improved, and the application is wide.
Description
Technical Field
The utility model relates to the technical field of vehicles, in particular to an electric vehicle four-wheel drive automatic switching system.
Background
Patent No. 2016206303604, entitled "traction control system for electric vehicle" discloses a traction control system for electric vehicle, but the system is applicable to electric vehicles, electric tricycles, electric motorcycles or electric bicycles only, and is not applicable to all terrain four-wheel drive vehicles, in which one of front and rear wheels is a driven wheel and the other is a driving wheel.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides an automatic switching system suitable for all-terrain four-wheel drive vehicles.
The technical scheme of the utility model is as follows:
the four-wheel drive automatic switching system of the electric vehicle comprises a power transmission driving part and a detection control part, wherein the power transmission driving part comprises a front wheel shaft, a front shaft motor, a rear wheel shaft, a rear shaft motor, a front differential speed changer and a rear differential speed changer, the front shaft motor is arranged on the front wheel shaft, the rear shaft motor is arranged on the rear wheel shaft, the front differential speed changer is connected with the front shaft motor, the rear differential speed changer is connected with the rear shaft motor, front wheels and rear wheels are respectively arranged at two ends of the front wheel shaft and the rear wheel shaft, vehicle speed sensors are respectively arranged on the front wheels and the rear wheels,
the detection control part consists of a switching control unit, a front motor controller, a rear motor controller, an accelerator and a vehicle speed sensor arranged on the front wheel and the rear wheel, wherein the front motor controller is respectively connected with the front motor, the rear motor controller is respectively connected with the rear motor,
the switching control unit is respectively connected with the front motor controller, the vehicle speed sensor on the front wheel, the rear motor controller and the vehicle speed sensor on the rear wheel so as to receive the rotating speeds V (F) and V (R) of the front wheel and the rear wheel and output an adjusting instruction to the corresponding motor controllers;
the switching control unit comprises a signal input module, a frequency capturing module connected with the signal input module and a singlechip connected with the frequency capturing module, wherein the singlechip stores a preset value V (d), and the frequency capturing module obtains the speeds of the front wheel and the rear wheel and transmits the speeds into the singlechip;
the singlechip judges whether the rotating speed difference V (R) -V (F) of the rear wheel exceeds the front wheel is larger than the preset value V (d), if the rotating speed difference V (R) -V (F) is larger than the preset value V (d), the singlechip gives out a command after time delay, stops the rear motor controller and drives the front motor controller to work; when the rotation speed difference V (F) -V (R) is smaller than a preset value, the singlechip judges again and then sends out an instruction, the front motor controller is stopped, and the rear motor controller is driven to work.
The further technical proposal is that the range of the preset value V (d) is 0.3V (R) to 0.5V (R).
The utility model has the beneficial effects that:
1. in the utility model, the front wheel shaft and the rear wheel shaft are respectively provided with the differential speed variator, and the differential speed variator is sequentially connected with the motor and the motor controller, and the front wheel and the rear wheel can be used as driving wheels, so that the driving wheels of the vehicle can be changed according to the condition of the road surface in the running process.
2. According to the utility model, the driving wheel of the vehicle can be automatically switched to realize the purpose of driving and preventing slipping in a single-chip microcomputer calculation and electronic control mode, meanwhile, the full electronic control is adopted, the reaction speed is high, the working smoothness is good, the traction control can be realized, the driving operation experience is not influenced, and meanwhile, the energy waste is not caused.
Drawings
Figure 1 is a schematic diagram of an automatic switching system for an all-terrain four-wheel drive vehicle in accordance with an embodiment of the present utility model,
fig. 2 is a schematic diagram of the switching control unit in fig. 1.
Detailed Description
The utility model will be further illustrated by the following non-limiting examples, which illustrate the utility model.
As shown in fig. 1-2, the utility model comprises a power transmission driving part and a detection control part, wherein the power transmission driving part comprises a front wheel shaft, a front shaft motor arranged on the front wheel shaft, a rear shaft motor arranged on the rear wheel shaft, a front differential speed changer connected with the front shaft motor, a rear differential speed changer connected with the rear shaft motor, front wheels and rear wheels are respectively arranged at two ends of the front wheel shaft and the rear wheel shaft, vehicle speed sensors are respectively arranged on the front wheels and the rear wheels,
the detection control part consists of a switching control unit, a front motor controller, a rear motor controller, an accelerator and a vehicle speed sensor arranged on the front wheel and the rear wheel, wherein the front motor controller is respectively connected with the front motor, the rear motor controller is respectively connected with the rear motor,
the switching control unit is respectively connected with the front motor controller, the vehicle speed sensor on the front wheel, the rear motor controller and the vehicle speed sensor on the rear wheel so as to receive the rotating speeds V (F) and V (R) of the front wheel and the rear wheel and output an adjusting instruction to the corresponding motor controllers;
the switching control unit comprises a signal input module, a frequency capturing module connected with the signal input module and a singlechip connected with the frequency capturing module, wherein the singlechip stores a preset value V (d), the range of the preset value V (d) is 0.3V (R) to 0.5V (R), and the frequency capturing module acquires the vehicle speeds of the front wheel and the rear wheel and transmits the vehicle speeds into the singlechip;
the singlechip judges whether the rotating speed difference V (R) -V (F) of the rear wheel exceeding the front wheel is larger than the preset value V (d), and then makes an instruction according to the judging result.
The working process is as follows:
when the vehicle is started initially, the switching control unit sends a working instruction to the rear motor controller, the rear motor controller starts working, and the vehicle is driven to start running. After running, the speed sensors on the front and rear wheels detect the speed V (F) of the front wheels and the wheels V (R) of the rear wheels in real time, and send the speed V (F) and the wheels V (R) to the switching control unit to calculate the difference between the V (F) and the V (R). During normal road running, since the vehicle speeds of the front and rear wheels are the same, i.e., V (F) =v (R), the switching control unit maintains the rear motor controller to operate, i.e., the rear wheels are the vehicle driving wheels.
When the rear wheel of the vehicle falls into the mud, the pool or ice and snow, slipping occurs, and V (R) is greater than V (F); when the difference value of V (R) exceeding V (F) reaches a preset value V (d), the switching control unit makes a judgment, and after delay, gives out an instruction, stops the rear motor controller and enables the front motor controller to start working. At this time, the front wheels automatically become vehicle driving wheels to drive the vehicle to depart from the skid road surface.
When the difference of V (R) exceeding V (F) is detected to be smaller than a preset value V (d) after the vehicle is separated from the skid road surface, the switching control unit makes a judgment again, the front motor controller is stopped after time delay, the rear motor controller starts to work, and at the moment, the vehicle is restored to be the driving wheels of the vehicle.
The system may additionally be provided with an automatic mode/manual mode switching button. When the automatic mode is pressed, the operation is performed in the above manner; when the manual mode is pressed, the front wheel is changed to the driving wheel, the rear wheel is changed to the driving wheel, or the front wheel and the rear wheel are both changed to the driving wheel through other front motor selection switches and rear motor selection switches.
In summary, the utility model discloses an automatic switching system for four-wheel drive of an electric vehicle, which is characterized in that a vehicle speed sensor is added on a vehicle wheel, and a signal is transmitted to a switching control unit for processing and then a working instruction is sent out. The vehicle driving wheel switching device has the advantages of being low in implementation difficulty and implementation cost, capable of effectively avoiding slipping caused by non-ideal road conditions through switching the vehicle driving wheels, capable of improving driving safety and wide in application.
Claims (2)
1. The four-wheel drive automatic switching system of the electric vehicle comprises a power transmission driving part and a detection control part, and is characterized in that the power transmission driving part comprises a front wheel shaft, a front shaft motor, a rear wheel shaft, a rear shaft motor, a front differential speed changer and a rear differential speed changer, wherein the front shaft motor and the rear shaft motor are arranged on the front wheel shaft, the front differential speed changer is connected with the front shaft motor, the rear differential speed changer is connected with the rear shaft motor, front wheels and rear wheels are respectively arranged at two ends of the front wheel shaft and the rear wheel shaft, vehicle speed sensors are respectively arranged on the front wheels and the rear wheels, the detection control part comprises a switching control unit, a front motor controller, a rear motor controller, an accelerator and vehicle speed sensors arranged on the front wheels and the rear wheels, the front motor controller is connected with the front motor, the rear motor controller is connected with the rear motor, and the switching control unit is respectively connected with the vehicle speed sensors on the front motor controller, the rear motor controller and the rear motor sensor on the rear wheels so as to receive the rotating speeds V (F) and V (R) of the front wheels and the rear wheels and output adjustment instructions to the corresponding motor controllers;
the switching control unit comprises a signal input module, a frequency capturing module connected with the signal input module and a singlechip connected with the frequency capturing module, wherein the singlechip stores a preset value V (d), and the frequency capturing module obtains the vehicle speeds of the front wheel and the rear wheel and transmits the vehicle speeds into the singlechip; the singlechip judges whether the rotating speed difference V (R) -V (F) of the rear wheel exceeds the front wheel is larger than the preset value V (d), if the rotating speed difference V (R) -V (F) is larger than the preset value V (d), the singlechip delays and then sends out a command, stops the rear motor controller and drives the front motor controller to work; when the rotating speed difference V (F) -V (R) is smaller than the preset value V (d), the singlechip judges again and then sends out an instruction, the front motor controller is stopped, and the rear motor controller is driven to work.
2. The four-wheel drive automatic switching system for an electric vehicle according to claim 1, wherein the preset value V (d) ranges from 0.3V (R) to 0.5V (R).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446946.4A CN107234984B (en) | 2017-06-14 | 2017-06-14 | Four-wheel drive automatic switching system of electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446946.4A CN107234984B (en) | 2017-06-14 | 2017-06-14 | Four-wheel drive automatic switching system of electric vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107234984A CN107234984A (en) | 2017-10-10 |
| CN107234984B true CN107234984B (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710446946.4A Active CN107234984B (en) | 2017-06-14 | 2017-06-14 | Four-wheel drive automatic switching system of electric vehicle |
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| Country | Link |
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| CN (1) | CN107234984B (en) |
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| JPS62214018A (en) * | 1986-03-14 | 1987-09-19 | Toyota Motor Corp | Gear ratio control method for continuously variable transmission of four-wheel drive vehicle |
| CN101376387A (en) * | 2007-08-31 | 2009-03-04 | 本田技研工业株式会社 | Transmission control device of motorcycle |
| CN101445047A (en) * | 2008-12-19 | 2009-06-03 | 海博瑞德（北京）汽车技术有限公司 | Driving system of all wheel drive hybrid powered vehicle |
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| JP2014207839A (en) * | 2013-04-16 | 2014-10-30 | 日産自動車株式会社 | Vehicle behavior control device |
| CN105438007A (en) * | 2015-12-03 | 2016-03-30 | 康迪电动汽车（长兴）有限公司 | Electric vehicle driving device |
| CN106004519A (en) * | 2016-06-21 | 2016-10-12 | 杭州虬龙科技有限公司 | TCS (traction control system) of electric vehicle |
| CN206954040U (en) * | 2017-06-14 | 2018-02-02 | 江苏林海动力机械集团有限公司 | A kind of electric car four-wheel drive automatic switchover system |
-
2017
- 2017-06-14 CN CN201710446946.4A patent/CN107234984B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62214018A (en) * | 1986-03-14 | 1987-09-19 | Toyota Motor Corp | Gear ratio control method for continuously variable transmission of four-wheel drive vehicle |
| CN101376387A (en) * | 2007-08-31 | 2009-03-04 | 本田技研工业株式会社 | Transmission control device of motorcycle |
| CN101445047A (en) * | 2008-12-19 | 2009-06-03 | 海博瑞德（北京）汽车技术有限公司 | Driving system of all wheel drive hybrid powered vehicle |
| CN103781652A (en) * | 2011-12-23 | 2014-05-07 | 大同工业株式会社 | Electric driving type utility vehicle having regenerative brake force distribution control function, and regenerative brake force distribution control method thereof |
| JP2014207839A (en) * | 2013-04-16 | 2014-10-30 | 日産自動車株式会社 | Vehicle behavior control device |
| CN103192832A (en) * | 2013-04-28 | 2013-07-10 | 长城汽车股份有限公司 | Snowfield mode control system for vehicle and snowfield mode control method for vehicle |
| CN105438007A (en) * | 2015-12-03 | 2016-03-30 | 康迪电动汽车（长兴）有限公司 | Electric vehicle driving device |
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| Publication number | Publication date |
|---|---|
| CN107234984A (en) | 2017-10-10 |
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