CN205524228U - Infinitely variable tractor control system - Google Patents
Infinitely variable tractor control system Download PDFInfo
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- CN205524228U CN205524228U CN201620253568.9U CN201620253568U CN205524228U CN 205524228 U CN205524228 U CN 205524228U CN 201620253568 U CN201620253568 U CN 201620253568U CN 205524228 U CN205524228 U CN 205524228U
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- control unit
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- tractor
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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
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Control Of Transmission Device (AREA)
Abstract
The utility model provides an infinitely variable tractor control system, includes engine, hydraulic pressure machinery buncher, speed sensor, draws force transducer, engine electronic control system unit, derailleur ecu, derailleur hydraulic control unit. The utility model discloses a speed of a motor vehicle, drag force, gear ratio and engine speed are as control parameter, derailleur ecu confirms best gear ratio and engine speed according to the speed of a motor vehicle and tractive load, through engine electronic control system unit and derailleur hydraulic control unit adjusting motor rotational speed and derailleur gear ratio, make tractor productivity ratio economic nature reaches synthesizes the best, guarantee that the tractor has better tractive performance, fuel economy and driving travelling comfort, improve the automation mechanized operation level of tractor.
Description
Technical field
This utility model relates to tractor control system, is specifically related to a kind of stepless speed changing tractor control system.
Background technology
Tractor is as the important tool of farmland operation, and complicated working environment makes the tractive load of tractor and speed of operation fluctuation relatively big, and hydraulic mechanical stepless gearbox can adapt to the operating mode of complexity, makes vehicle performance be greatly improved.Generally, the mode of operation of stepless speed changing tractor is divided into productivity ratio maximum functional pattern and economy optimum working mode, and wherein, under productivity ratio maximum functional pattern, tractor fuel economy is poor；Under economy optimal mode, tractor is operated in fuel oil and consumes minimum point, if now increasing suddenly vehicle tractive load, is easily caused engine misses.
At present, ensure again the economy of tractor in order to obtain bigger productivity ratio simultaneously, introduce weight coefficient in tractor control method.Such as, Hao Yunzhi, Sun Dongye etc. propose in " stepless gear system global optimization control strategy " literary composition: select suitable weight coefficient by the judgement of driver, thus it is optimal to obtain the entirety of vehicle drive system under certain condition.But through practical operation, the proficiency level of each operator is different with to the judgement of complicated condition of road surface, can not obtain good effect.
Utility model content
This utility model solves the problem of contradiction between tractor economy and productivity ratio to overcome art methods to be difficult to well, it is provided that a kind of stepless speed changing tractor control system.
nullThe technical scheme that this utility model is used by solving the problems referred to above is: a kind of stepless speed changing tractor control system，Including electromotor、Hydraulic mechanical stepless gearbox、Vehicle speed sensor、Drawbar load sensing mechanism、Engine electronic control unit、Transmission electronic control unit、Transmission pressure control unit，Described hydraulic mechanical stepless gearbox includes mechanical variable speed device、Hydraulic speed regulating mechanism and being carried out by mechanically and hydraulically power confluxes the planetary gears of synthesis，The Closed Hydraulic speed adjusting gear that hydraulic speed regulating mechanism is made up of electrohydraulic proportional variable pump and fixed displacement motor，Electrohydraulic proportional variable pump includes electric-hydraulic proportion electromagnetic valve、Cylinder Plunger and swash plate，Wherein，The outfan of drawbar load sensing mechanism and vehicle speed sensor is connected with the input of transmission electronic control unit，The outfan of transmission electronic control unit and engine electronic control unit、The input of transmission pressure control unit connects，Transmission pressure control unit is according to the control signal of optimal gear ratio output swashplate angle，Electric-hydraulic proportion electromagnetic valve receives this control signal，After amplifier，Control Cylinder Plunger motion，Promotion swash plate deflects，Change variable pump delivery ratio，Realize infinitely variable speeds.
Further, transmission electronic control unit includes central processing module, signal input module, signal output module, communication module and emergency processing module, and wherein, central processing module includes power module, reseting module, clock module, jtag interface.
Further, signal input module is for central processing module input reflection driver intention and Full Vehicle System status information；Signal output module is for driving the electromagnetic valve of transmission pressure control unit to realize speed changer.
Further, communication module includes CAN communication module, SCI communication module, SPI display module.
In this utility model, emergency processing module is for when variator cannot normally work, variator low-speed forward or reversing section clutch is forced to combine by external switch circuit, make engine power can be delivered to tractor driving wheel by variator, it is ensured that tractor can be transferred to maintenance station from trouble point by driver.
Beneficial effect: this utility model utilizes vehicle speed sensor, the outfan of drawbar load sensing mechanism is connected with the input of transmission electronic control unit, transmission electronic control unit determines the rotating speed of optimal gear ratio and electromotor according to tractor speed and tractive load, by engine electronic control unit regulation corresponding with transmission pressure control unit engine speed and speed changer ratio, tractor productivity ratio-economy is made to reach comprehensive optimal, ensure that tractor has preferable hauling ability, fuel economy and driver comfort, improve the automation mechanized operation level of tractor.
Accompanying drawing explanation
Fig. 1 is transmission electronic control unit schematic diagram in this utility model；
Fig. 2 is stepless speed changing tractor control system schematic diagram；
Fig. 3 is electromotor, the control principle drawing of variable pump-fixed displacement motor hydraulic speed regulating mechanism；
Fig. 4 is electromotor, variator Collaborative Control schematic diagram；
Reference: in accompanying drawing 3,1, electric-hydraulic proportion electromagnetic valve, 2, Cylinder Plunger, 3, overflow valve, 4, high-pressure overflow valve, 5, voltage stabilizing overflow valve, 6, filter, 7, fuel tank.
Detailed description of the invention
Below in conjunction with specific embodiment, the utility model is described in further detail, so that those skilled in the art can be better understood from this utility model and can be practiced, but illustrated embodiment is not as to restriction of the present utility model.
nullA kind of stepless speed changing tractor control system，Including electromotor、Hydraulic mechanical stepless gearbox、Vehicle speed sensor、Drawbar load sensing mechanism、Engine electronic control unit、Transmission electronic control unit、Transmission pressure control unit，Described hydraulic mechanical stepless gearbox includes mechanical variable speed device、Hydraulic speed regulating mechanism and being carried out by mechanically and hydraulically power confluxes the planetary gears of synthesis，Wherein，The Closed Hydraulic speed adjusting gear that hydraulic speed regulating mechanism is made up of electrohydraulic proportional variable pump and fixed displacement motor，Electrohydraulic proportional variable pump includes electric-hydraulic proportion electromagnetic valve、Cylinder Plunger and swash plate，The outfan of drawbar load sensing mechanism and vehicle speed sensor is connected with the input of transmission electronic control unit，The outfan of transmission electronic control unit and engine electronic control unit、The input of transmission pressure control unit connects，Transmission pressure control unit is according to the control signal of optimal gear ratio output swashplate angle，Electric-hydraulic proportion electromagnetic valve receives this control signal，After amplifier，Control Cylinder Plunger motion，Promotion swash plate deflects，Change variable pump delivery ratio，Realize infinitely variable speeds.
Wherein, as shown in Figure 1, transmission electronic control unit includes central processing module, signal input module, signal output module, communication module and emergency processing module, and wherein, central processing module includes power module, reseting module, clock module, jtag interface；Signal input module is for central processing module input reflection driver intention and Full Vehicle System status information；Signal output module is for driving the electromagnetic valve of transmission pressure control unit to realize speed changer；Communication module includes CAN communication module, SCI communication module, SPI display module.
In this utility model, transmission electronic control unit schematic diagram as shown in Figure 1, this utility model uses TMS320C24X type DSP microcontroller, main interface signal has: input signal have include vehicle advance, reversing, driving switch, rack displacement, the analogue signal such as tractive resistance, speed of operation, clutch pressure.Output signal clutch solenoid directional control valve switch controlling signal, variable pump control proportional solenoid valve control signal, electromotor instruction tach signal.The numerical value such as man machine interface display speed, gear ratio, engine speed, discharge capacity ratio.
DSP is built-in with microprocessor, program and data flash storage, RAM, pwm control circuit, A/D and D/A, Parallel I/O Interface, CAN interface etc..Photoelectric isolating circuit can protect microcontroller; improving TCU capacity of resisting disturbance, analogue signal is amplified, filters by signal conditioning circuit, it is ensured that input of sampling reliably; power amplification circuit carries out power amplification to signal and reaches requirements, and power component is carried out short circuit and anti-pressure protection.Emergency circuit is when controller failure, it is ensured that tractor can be saved oneself traveling by low speed.
Electromotor uses electronic speed regulation, electron speed regulator receives electromotor instruction rotating speed, output tooth bar displacement drive signal, control oil pump rack displacement, adjust fuel delivery, and then change engine speed, it is ensured that actual engine speed is consistent with instruction rotating speed, speed regulator measures engine speed and rack displacement in real time, uses closed-loop fashion to control rack displacement and rotating speed.
This utility model utilizes vehicle speed sensor, the outfan of drawbar load sensing mechanism to be connected with the input of transmission electronic control unit, transmission electronic control unit determines the rotating speed of optimal gear ratio and electromotor according to tractor speed and tractive load, by engine electronic control unit regulation corresponding with transmission pressure control unit engine speed and speed changer ratio.The utility model proposes by target vehicle speed, tractive resistance, optimal gear ratio and engine speed as controlling parameter, it is achieved the engineer applied of comprehensive optimal infinitely variable speeds rule；Controlling target is that tractor travels according to given speed, according to the change of tractive load, regulation gear ratio and engine speed, it is achieved tractor productivity ratio-economy is comprehensively optimal, controls input for target vehicle speed and pull strength；Control to be output as the optimal gear ratio of variator and engine speed.Tractor productivity ratio-the economy of foundation infinitely variable speeds law formulation comprehensively optimal change control system, including: vehicle speed sensor, for measuring the speed that tractor travels；Drawbar load sensing mechanism, for measuring the tractive resistance of tractor work；Transmission electronic control unit, according to speed and tractive load, it is determined that engine load, determines the optimal gear ratio of variator and corresponding engine speed；Engine electronic control unit, regulates engine speed according to engine rotational speed signal；HMCVT hydraulic control unit, according to gear ratio Signal Regulation variable pump swashplate angle, changes pump delivery ratio, it is achieved infinitely variable speeds.Wherein, vehicle speed sensor is arranged on tractor non-driving wheel, and drawbar load sensing mechanism is arranged on the junction of tractor hydraulic hitch and agricultural machinery and implement.
This utility model utilizes electron controls technology to realize hydraulic machinery stepless speed changing tractor productivity ratio-economy comprehensively optimal infinitely variable speeds and control.By monitoring tractor-drawn resistance and speed, regulation speed changer ratio and engine speed, tractor is made to be operated in the comprehensive optimum condition of productivity ratio-economy.
Electromotor as shown in Figure 4, variator Collaborative Control principle, obtained driving force and transmission torque by tractor drawbar pull, according to tractor slippage rate characteristic curve, calculates vehicle slippage rate；According to target velocity, calculate tractor theoretical velocity and variator rotating speed, by optimal gear ratio table, obtain the optimal gear ratio of variator and engine speed, regulate electromotor and speed changer ratio respectively according to engine speed and optimal gear ratio.For ensureing that speed is stable, speed is carried out feedback control.
Control system principle as shown in Figure 2, draft-sensing device device and vehicle speed sensor signal are input to the signal processing unit of speed change ECU, signal passes to engine load identifying unit and Collaborative Control unit after treatment, engine speed and the optimal gear ratio of variator is obtained through calculating, engine speed instruction is input to Engine ECU, control and regulation engine speed, optimal gear ratio instruction is input to HMCVT hydraulic control unit, control and regulation variator swashplate angle, change variable pump delivery ratio, it is achieved infinitely variable speeds.
Electromotor as shown in Figure 3, pump-motor control system principle, electromotor uses electronic speed regulation, electron speed regulator receives electromotor instruction rotating speed, output tooth bar displacement drive signal, control oil pump rack displacement, adjust fuel delivery, and then change engine speed, ensureing that actual engine speed is consistent with instruction rotating speed, speed regulator measures engine speed and rack displacement in real time, uses closed-loop fashion to control rack displacement and rotating speed.
In this utility model, as it is shown on figure 3, variable pump-fixed displacement motor uses closed-type cylindrical gearing, electric-hydraulic proportion electromagnetic valve 1 receives the variator swashplate angle signal of telecommunication, after amplifier, controls Cylinder Plunger 2 and moves, promotes swash plate to deflect, change variable pump delivery ratio.Electric-hydraulic proportion electromagnetic valve 1 is fed back by the mechanical rigid of Cylinder Plunger 2, it is achieved enclosed controls, and makes swashplate angle and controls current in proportion change.During for avoiding acceleration and deceleration, swash plate rotates and too fast causes oil circuit pressure to reach maximum working pressure, and relief valve is when working connection oil pressure exceedes setting value, to oil circuit control pressure release；Overflow valve 3 is when working connection oil pressure exceedes maximum, to oil circuit overflow, the safety of protection pump-motor system；A small amount of fluid of working connection low-pressure side is overflowed back oil circuit by flushing valve, plays flushing oil circuit impurity and the effect of cooling, it is to avoid high oil temperature affects performance and the leakage of hydraulic system；The leakage of pump-motor and the oil overflow liquid stream of flushing valve enter cooler, be back to fuel tank and recycle after cooling.High-pressure overflow valve 4, is to protect working connection when working connection pressure reaches maximum pressure value；Voltage stabilizing overflow valve 5, makes from fuel tank 7 oily voltage stabilizing out；The oil entering fuel tank 7 needs to filter through filter.
Claims (4)
- null1. a stepless speed changing tractor control system，Including electromotor、Hydraulic mechanical stepless gearbox、Vehicle speed sensor、Drawbar load sensing mechanism、Engine electronic control unit、Transmission electronic control unit、Transmission pressure control unit，It is characterized in that: described hydraulic mechanical stepless gearbox includes mechanical variable speed device、Hydraulic speed regulating mechanism and being carried out by mechanically and hydraulically power confluxes the planetary gears of synthesis，The Closed Hydraulic speed adjusting gear that hydraulic speed regulating mechanism is made up of electrohydraulic proportional variable pump and fixed displacement motor，Electrohydraulic proportional variable pump includes electric-hydraulic proportion electromagnetic valve、Cylinder Plunger and swash plate，Wherein，The outfan of drawbar load sensing mechanism and vehicle speed sensor is connected with the input of transmission electronic control unit，The outfan of transmission electronic control unit and engine electronic control unit、The input of transmission pressure control unit connects，Transmission pressure control unit is according to the control signal of optimal gear ratio output swashplate angle，Electric-hydraulic proportion electromagnetic valve receives this control signal，After amplifier，Control Cylinder Plunger motion，Promotion swash plate deflects，Change variable pump delivery ratio，Realize infinitely variable speeds.
- A kind of stepless speed changing tractor control system the most according to claim 1, it is characterized in that: transmission electronic control unit includes central processing module, signal input module, signal output module, communication module and emergency processing module, wherein, central processing module includes power module, reseting module, clock module, jtag interface.
- A kind of stepless speed changing tractor control system the most according to claim 1, it is characterised in that: signal input module is for central processing module input reflection driver intention and Full Vehicle System status information；Signal output module is for driving the electromagnetic valve of transmission pressure control unit to realize speed changer.
- A kind of stepless speed changing tractor control system the most according to claim 1, it is characterised in that: communication module includes CAN communication module, SCI communication module, SPI display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620253568.9U CN205524228U (en) | 2016-03-30 | 2016-03-30 | Infinitely variable tractor control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620253568.9U CN205524228U (en) | 2016-03-30 | 2016-03-30 | Infinitely variable tractor control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205524228U true CN205524228U (en) | 2016-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620253568.9U Expired - Fee Related CN205524228U (en) | 2016-03-30 | 2016-03-30 | Infinitely variable tractor control system |
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| Country | Link |
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| CN (1) | CN205524228U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105711581A (en) * | 2016-03-30 | 2016-06-29 | 河南科技大学 | Stepless speed change tractor control system and control method thereof |
| CN113301794A (en) * | 2019-01-15 | 2021-08-24 | 株式会社久保田 | Vehicle speed control system |
| CN113585151A (en) * | 2021-07-22 | 2021-11-02 | 滁州永强汽车制造有限公司 | Efficient snow throwing vehicle |
-
2016
- 2016-03-30 CN CN201620253568.9U patent/CN205524228U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105711581A (en) * | 2016-03-30 | 2016-06-29 | 河南科技大学 | Stepless speed change tractor control system and control method thereof |
| CN113301794A (en) * | 2019-01-15 | 2021-08-24 | 株式会社久保田 | Vehicle speed control system |
| CN113585151A (en) * | 2021-07-22 | 2021-11-02 | 滁州永强汽车制造有限公司 | Efficient snow throwing vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20180330 |