CN105711582B - What a kind of Multi-Range Hydro-Mechanical Stepless speed changer changed section control system changes phase method - Google Patents

Abstract

A method for changing sections of a multi-stage hydromechanical continuously variable transmission control system, including an engine that provides power to a tractor, a continuously variable transmission, an engine control unit for controlling the engine, a transmission electronic control unit, a transmission input speed sensor and a transmission output Speed sensor, the transmission input speed sensor is arranged on the input shaft of the continuously variable transmission, the transmission output speed sensor is arranged on the output shaft of the continuously variable transmission, the engine control unit, transmission electronic control unit, transmission input speed sensor It is connected with the output speed sensor of the transmission through a closed CAN bus; the invention can effectively eliminate the phenomenon of cyclic shifting during the shifting process of the continuously variable transmission, and can ensure that at the point of shifting, priority is given to working in the low-speed working section to achieve reduction in speed. The principle of speed priority has effectively improved the power and safety reliability of the vehicle during driving.

Description

A method for changing gears in a gear shifting control system of a multi-stage hydraulic-mechanical continuously variable transmission

technical field

The invention relates to the technical field of multi-stage hydraulic-mechanical continuously variable transmissions for tractors, in particular to a method for changing stages of a multi-stage hydraulic-mechanical continuously variable transmission control system.

Background technique

Multi-stage hydromechanical continuously variable transmission (HMCVT) has the advantages of wide speed range, easy operation, high transmission efficiency, high fuel economy and low emission pollution, and has been widely used in modern high-power agricultural tractors. However, due to the efficiency difference between the sections, it is inevitable to change the section in a cycle during the section changing process, which seriously affects the ride comfort and power performance of the vehicle. Establishing a reasonable section change method can avoid the section change cycle, and is also conducive to improving the vehicle's power performance, fuel economy and adaptability to harsh environments.

The current research on the shifting of multi-stage hydromechanical continuously variable transmissions for tractors is mainly to reduce the clutch engagement time or control the shifting oil pressure to reduce the impact of shifting and ensure the stability of the vehicle, but it has not solved the problems encountered in the driving process of the vehicle. The problem of cycle change.

Contents of the invention

The object of the present invention is to provide a section-changing method for a section-changing control system of a multi-stage hydraulic-mechanical continuously variable transmission in order to solve the problem of cyclic section-changing in the running process of a vehicle.

The technical solution adopted in the present invention is: a method for changing sections of a multi-section hydraulic-mechanical continuously variable transmission control system. The section changing control system includes an engine that provides power to the tractor, a continuously variable transmission, and an engine control unit for controlling the engine. , a transmission electronic control unit, a transmission input speed sensor and a transmission output speed sensor, the transmission input speed sensor is arranged on the input shaft of the continuously variable transmission, and the transmission output speed sensor is arranged on the output shaft of the continuously variable transmission, the The engine control unit, transmission electronic control unit, transmission input speed sensor and transmission output speed sensor are connected through a closed CAN bus;

The transmission electronic control unit includes a microprocessor DSP, a power supply module, an input signal processing module and an output signal processing module, and the input signal processing module includes two optocoupler isolation modules and a filter processing module respectively connected to the microprocessor DSP , the output signal processing module includes a drive module connected to the microprocessor DSP, an SPI serial port and two optocoupler isolation modules, a DC-DC power conversion module is arranged between the microprocessor DSP and the power module, so One of the optocoupler isolation modules in the input signal processing modules is connected to the continuously variable transmission, and the driving module is connected to the CAN bus.

The continuously variable transmission includes a multi-speed transmission mechanism, a closed variable variable pump-quantitative motor transmission system, a double-row planetary power splitting mechanism and a power converging mechanism.

The engine uses an electronic governor to automatically control the speed.

Both the transmission input speed sensor and the transmission output speed sensor are magnetoelectric sensors.

An emergency circuit is also connected to the DC-DC power conversion module.

A method for changing sections of a multi-stage hydraulic-mechanical continuously variable transmission control system, comprising the following steps: Step 1. First, determine the number R of the working section according to the state of the continuously variable transmission, and calculate the shift between section R and section R+1 of the continuously variable transmission. Segment output speed R segment and R-1 segment switching point output speed R section and R+1 section switch point input speed and the current output speed V _O ;

Step 2, determine the variation trend of the output speed of the continuously variable transmission and perform the following comparative analysis on the data;

(1) If the output speed of the continuously variable transmission is gradually increasing, and the output speed of the continuously variable transmission Then the CVT is in the acceleration state within the segment, the segment of the CVT does not need to change, the clutch does not need to change its engagement state, and the transmission electronic control unit controls the transmission to continue to work according to the set shift rule;

(2) If the output speed of the continuously variable transmission is gradually increasing, and the output speed of the transmission input speed Then the clutch is in the state of preparing to change gears, and the transmission electronic control unit outputs commands to keep the transmission output speed V _O unchanged and increase the transmission input speed V _I , but the transmission gear does not need to change, and the clutch does not need to change its engagement state;

(3) If the output speed of the continuously variable transmission is gradually increasing, and the output speed input speed Then the clutch is in the up-stage state, and the transmission will be upgraded from a low gear to a high gear, and the transmission electronic control unit changes the engagement state of the clutch by controlling the corresponding solenoid valve to complete the shift;

(4) If the output speed of the continuously variable transmission is gradually decreasing, and the output speed Then the clutch is in the deceleration state within the stage, and the transmission electronic control unit controls the transmission to work according to the set speed change rule, the stage does not need to be changed, and the engagement state of the clutch does not need to be changed;

(5) If the output speed of the continuously variable transmission is gradually decreasing, and the output speed If the clutch is in the downshift state, the transmission will drop from a high gear to a low gear, and the transmission electronic control unit will also change the engagement state of the clutch by controlling the corresponding solenoid valve to complete the gear change.

The output speed of the R section and R+1 section change point of the continuously variable transmission R section and R-1 section transition point speed R section and R+1 section switch point input speed According to the formula:

where n _e is the engine output speed, is the upper and lower limit of the gear ratio of the transmission in the corresponding working section R, It is the upper and lower limits of the gear ratio of the transmission in the corresponding working section R.

Beneficial effects of the present invention: the section-changing method of the tractor multi-section hydraulic-mechanical continuously variable transmission control system of the present invention uses the speed of the input and output shafts of the continuously variable transmission as the comparison object when changing sections, and the measurement is convenient and simple. Effectively eliminate the phenomenon of cyclic shifting during the shifting process of the continuously variable transmission, and can ensure that at the point of shifting, the priority is to work in the low-speed working section, realizing the principle of speed reduction priority, and effectively improving the dynamic performance of the vehicle during driving and safety and reliability.

Description of drawings

Fig. 1 is the schematic diagram of the present invention to eliminate cycle change;

Fig. 2 is a composition diagram of the control system of the present invention;

Fig. 3 is the overall structural diagram of TCU in the control system of the present invention;

Fig. 4 is a transmission diagram of the multi-stage hydraulic-mechanical continuously variable transmission of the present invention;

Fig. 5 is a flow chart of state transition of the multi-stage hydromechanical continuously variable transmission in automatic mode.

Marks in the figure: 1. engine, 2. continuously variable transmission, 3. engine control unit, 4. transmission control unit, 5. transmission input speed sensor, 6. transmission output speed sensor, 7. CAN bus, 8. speed change mechanism, 9. Closed variable variable pump-quantitative motor transmission system, 10. Power splitting mechanism, 11. Power converging mechanism.

Detailed ways

As shown in the figure, a shifting method of a multi-stage hydraulic-mechanical continuously variable transmission shifting control system includes an engine that powers a tractor, a continuously variable transmission, an engine control unit for controlling the engine, a transmission electronic control unit, and a transmission input A speed sensor and a transmission output speed sensor, the transmission input speed sensor is arranged on the input shaft of the continuously variable transmission, the transmission output speed sensor is arranged on the output shaft of the continuously variable transmission, the engine control unit, transmission electronic control unit The transmission input speed sensor and the transmission output speed sensor are connected through a closed CAN bus;

The transmission electronic control unit includes a microprocessor DSP, a power supply module, an input signal processing module and an output signal processing module, and the input signal processing module includes two optocoupler isolation modules and a filter processing module respectively connected to the microprocessor DSP , the output signal processing module includes a drive module connected to the microprocessor DSP, an SPI serial port and two optocoupler isolation modules, a DC-DC power conversion module is arranged between the microprocessor DSP and the power module, so One of the optocoupler isolation modules in the input signal processing modules is connected to the continuously variable transmission, and the driving module is connected to the CAN bus.

The continuously variable transmission includes a multi-speed transmission mechanism, a closed variable variable pump-quantitative motor transmission system, a double-row planetary power splitting mechanism and a power converging mechanism.

The engine uses an electronic governor to automatically control the speed.

Both the transmission input speed sensor and the transmission output speed sensor are magnetoelectric sensors.

An emergency circuit is also connected to the DC-DC power conversion module.

A method for changing sections of a multi-stage hydraulic-mechanical continuously variable transmission control system, comprising the following steps: Step 1. First, determine the number R of the working section according to the state of the continuously variable transmission, and calculate the shift between section R and section R+1 of the continuously variable transmission. Segment output speed R segment and R-1 segment switching point output speed R section and R+1 section switch point input speed and the current output speed V _O ;

Step 2, determine the variation trend of the output speed of the continuously variable transmission and perform the following comparative analysis on the data;

(1) If the output speed of the continuously variable transmission is gradually increasing, and the output speed of the continuously variable transmission Then the CVT is in the acceleration state within the segment, the segment of the CVT does not need to change, the clutch does not need to change its engagement state, and the transmission electronic control unit controls the transmission to continue to work according to the set shift rule;

(2) If the output speed of the continuously variable transmission is gradually increasing, and the output speed of the transmission input speed Then the clutch is in the state of preparing to change gears, and the transmission electronic control unit outputs commands to keep the transmission output speed V _O unchanged and increase the transmission input speed V _I , but the transmission gear does not need to change, and the clutch does not need to change its engagement state;

(3) If the output speed of the continuously variable transmission is gradually increasing, and the output speed input speed Then the clutch is in the up-stage state, and the transmission will be upgraded from a low gear to a high gear, and the transmission electronic control unit changes the engagement state of the clutch by controlling the corresponding solenoid valve to complete the shift;

(4) If the output speed of the continuously variable transmission is gradually decreasing, and the output speed Then the clutch is in the deceleration state within the stage, and the transmission electronic control unit controls the transmission to work according to the set speed change rule, the stage does not need to be changed, and the engagement state of the clutch does not need to be changed;

(5) If the output speed of the continuously variable transmission is gradually decreasing, and the output speed If the clutch is in the downshift state, the transmission will drop from a high gear to a low gear, and the transmission electronic control unit will also change the engagement state of the clutch by controlling the corresponding solenoid valve to complete the gear change.

The output speed of the R section and R+1 section change point of the continuously variable transmission R section and R-1 section transition point speed R section and R+1 section switch point input speed According to the formula

where n _e is the engine output speed, is the upper and lower limit of the gear ratio of the transmission in the corresponding working section R, It is the upper and lower limits of the gear ratio of the transmission in the corresponding working section R.

As shown in Figure 1, V _I -t represents the change of the input speed V _I of the continuously variable transmission with time, V _O -t represents the change of the output speed V _O of the continuously variable transmission with time, R-1, R, R+1 are session number, Output speed for the transition point between R segment and R+1 segment, Output the speed for the transition point between R segment and R-1 segment, Enter the upper speed limit for the CVT shift point where the R section is adjacent to the R+1 section, Input the upper speed limit for the step-change point of the continuously variable transmission adjacent to the R-section and the R-1 section. The time t1 represents the ready-to-change state from the R-1 section to the R-section, and the t2 time represents the transition from the R-1 section to the R-section. Segment status, time t3 represents the state of preparing to change from segment R to segment R+1, time t4 represents the state of upgrading from segment R to segment R+1, and time t5 represents the state of descending from segment R to segment R-1 state, t6 time means entering the step-down state from segment R+1 to segment R.

As shown in Figure 2, the step-change control system of a continuously variable transmission is composed of an engine control unit, a transmission electronic control unit, a transmission input speed sensor, and a transmission output speed sensor. The transmission is composed of a mechanical speed change mechanism, a closed variable pump-quantitative motor transmission system, and a planetary gear mechanism for power splitting and backflow. The engine control unit calibrates the preset parameters of the engine in advance, and inputs the set speed to the engine, and the engine uses an electronic governor to automatically control the speed. The electronic governor receives the set speed of the engine, outputs the rack displacement drive signal, controls the displacement of the oil pump rack, adjusts the fuel supply, and ensures that the actual speed of the engine is consistent with the commanded speed. The governor measures the engine speed and rack displacement in real time, and controls the rack displacement and engine speed in a closed-loop manner, and the governor also outputs engine speed data information externally. The transmission input speed sensor and the transmission output speed sensor respectively continuously collect the input and output shaft speed information of the continuously variable transmission and send these data information to the engine control unit and TCU through the CAN bus, and the engine control unit transmits the engine speed, torque and power data The information is transmitted to TCU via CAN bus. The speed sensor adopts a magnetoelectric sensor and is installed next to the input shaft and output shaft of the continuously variable transmission.

As shown in Figure 3, it mainly includes a power supply module, an input signal processing module, a microprocessor DSP, and an output signal processing module. TCU uses TI's TMS320F2812 DSP microcontroller. The main internal functional circuits include optocoupler isolation, power amplification, filter processing, communication interface modules, and emergency circuits. The input switch signal, output switch signal, speed frequency signal and serial bus signal are connected to the DSP through the optocoupler isolation circuit to ensure the anti-interference performance of the TCU; the power amplifier circuit amplifies the power of the clutch solenoid valve switch signal and the proportional valve PWM control signal , provide the voltage and current required by the electromagnetic coil, and protect the power components against short circuit and reverse voltage; the filter processing circuit amplifies and filters the analog input signal, and adjusts it into the voltage range required by the DSP A/D converter to ensure reliability input sampling; the communication interface circuit replaces the CAN interface of the microcontroller with the level required by the serial bus drive interface; when the DSP fails, the emergency circuit provides the basic control signal of the clutch to make the HMCVT work according to the predetermined transmission ratio, so that The tractor is in a low-speed self-rescue driving state.

Since the information acquisition system is installed near the engine, it is greatly affected by electromagnetic radiation and thermal radiation. The vehicle input signals can be roughly divided into three types: analog, switch and pulse signals. All input signals need to be processed by optocoupler isolation or filtering, limiting, and amplification through the input signal processing module, and then pass these signals to the DSP core to make a decision, whether to perform intra-segment speed regulation or change-segment control, Then the signal is processed through the output signal processing module for power amplification or optocoupler isolation, etc., and then drives the corresponding solenoid valve or proportional valve to complete the specified action. If the shifting control is required, the TCU outputs the pressure to drive the corresponding solenoid valve to directly control the wet multi-disc clutch, thereby controlling the shifting of the continuously variable transmission.

As shown in Figure 4, Roman characters (I~XV) indicate the shaft; numbers or alphanumerics indicate the gear serial number; y, b, j indicate the port respectively.

The multi-stage hydraulic-mechanical continuously variable transmission is composed of an engine, a multi-speed transmission mechanism, a closed variable pump-quantitative motor transmission system, and a power splitting and converging mechanism of a double-row planetary row. The sun gears, ring gears and planet carriers of the planetary rows K1 and K2 in Fig. 4 are denoted by s1, r1, cr1 and s2, r2, cr2 respectively, Cf is the forward segment clutch, and Cr is the reverse segment clutch. Engine output power is the sum of hydraulic power and mechanical power. The mechanical power is transmitted to the planetary carrier cr2 of the planetary row K2 and the ring gear r1 of K1 through variable speed, and after the confluence of the double planetary row transmission and the hydraulic power, it is output in two ways: one is output by the planetary carrier cr1 of the planetary row K1; The ring gear r2 output of the planetary row K2. The hydraulic power is also output in two ways through the hydraulic transmission system and mechanical transmission, one way is transmitted to the sun gears s1 and s2 of the double planetary row, and the mechanical power flow is output back, and the other way is output separately through the clutch Ch.

According to the engagement status of multiple sets of clutches, when the forward clutch Cf is engaged, when the clutches Ch, C1, C2, C3, and C3-C4 are respectively engaged sequentially, the forward direction of the transmission will form a 5-stage continuously variable transmission stage; in the reverse stage, the clutch Cr When combined, when the clutches Ch, C1, C2, and C3 are respectively combined sequentially, a 4-stage continuously variable transmission section is formed in the reverse direction.

The control principle of multi-stage hydraulic-mechanical continuously variable transmission for tractors is shown in Figures 1 to 5, and the specific description is as follows:

When the output speed of the transmission increases gradually and the stage is gradually increased, the output speed V _O of the continuously variable transmission at time t1 is equal to the output speed at the point where the R-1 section of the transmission changes section and the R section Keep the output speed V _O unchanged without changing the section, and start to control the transmission input speed V _I to increase; at the time t2, when the input speed V _I is equal to the input speed at the point where the R-1 section and the R section change section When , the section is changed immediately, from section R-1 to section R; at time t3, the output speed V _O of the continuously variable transmission is equal to the output speed at the section change point between section R and section R+1 of the transmission At t4, the transmission input speed V _I is equal to the input speed at the shift point between R segment and R _{+ 1} segment. , change the section immediately, and enter the R+1 section from the R section; when the transmission output speed gradually decreases, and gradually decreases the section, the output speed of the continuously variable transmission at time t5 Immediately change the section, drop from section R to section R-1; at time t6, the output speed of the continuously variable transmission Immediately change the segment, descending from the R+1 segment to the R segment.

The specific steps of the section-changing method of the multi-stage hydraulic-mechanical continuously variable transmission control system of the present invention are as follows: the transmission input speed sensor and the output speed sensor installed on the input and output shafts of the continuously variable transmission continuously collect the currently detected input and output respectively According to the corresponding signal generated by the speed change of the shaft, the data information is transmitted to the CAN bus, and then the CAN bus sends the information to the TCU. The TCU calculates the working segment number R according to the obtained information, and determines the R segment and the R+1 segment. segment output speed R-1 segment change point output speed And the input speed of the segment change point with R+1 segment Based on the principle of shifting, the TCU judges the current working status of the tractor’s CVT through the CVT state judgment process shown in Figure 5, determines whether a shift is required, and then outputs corresponding commands to control the engagement of the clutch in the CVT. The specific description is as follows:

(1) If the output speed of the continuously variable transmission And the output speed is gradually increasing, and the TCU judges that the continuously variable transmission is in the in-segment acceleration state. The TCU sends commands to the CAN bus according to the judgment results, and sends these control command information to the engine control unit and the sensor control unit respectively through the CAN bus to form a closed-loop loop and continue to work according to the speed change law. The clutch does not need to change its combined state, and the segment does not need change.

(2) If the output speed of the continuously variable transmission input speed and the input speed is gradually increasing, the TCU judges that the continuously variable transmission is in the state of preparing for gear shifting; the TCU issues commands to keep the output speed of the continuously variable transmission unchanged and increase the input speed, and send these control command information to the engine control unit via the CAN bus It forms a closed-loop loop with the sensor control unit, and controls the output speed of the transmission to remain unchanged, the input speed to increase gradually, the clutch to not change its combined state, and the position to remain unchanged for the time being.

(3) If the output speed of the continuously variable transmission input speed And if the input speed is gradually increasing, the TCU judges that the continuously variable transmission is in a state of rising to the next hydraulic stage. The TCU sends instructions to the CAN bus according to the judgment result, and drives the corresponding solenoid valve and proportional valve to control the combination of the clutch, thereby completing the shift control. The engagement state of the clutch changes, and the rank rises to a higher rank.

(4) If the continuously variable transmission is in the trend of gradually decreasing input speed, and the output speed Then the TCU judges that the continuously variable transmission is in an in-segment deceleration state. The TCU sends instructions to the CAN bus according to the judgment result, and sends these control instruction information to the engine control unit and the sensor control unit respectively through the CAN bus, so that they can continue to work according to the speed change rule, and the clutch does not need to change the combination state, and the position does not need to change.

(5) If the continuously variable transmission is in the trend of gradually decreasing input speed, and the output speed Then the TCU judges that the continuously variable transmission is in the descending state of falling into the low hydraulic pressure stage. The TCU drives the corresponding electromagnetic valve and proportional valve to control the combination of the clutch according to the judgment result, so as to complete the shift control. The engagement state of the clutch changes, and the stage drops into stage.

The process of judging the state of the continuously variable transmission shown in Fig. 4 is specifically as follows: firstly, the state of the continuously variable transmission is given According to the specific value of the transmission output speed sensor, the change of the transmission output speed is judged. If V _O increases gradually, then judge Whether it is true, if it is not true, it means that the transmission is in the acceleration state in the section, and the process ends; if it is true, judge according to the speed signal from the transmission input speed sensor Whether it is true, if true, the transmission is in an upshift state, and the process ends; if not, it means that the transmission is in a state of preparation for shifting, and the process ends. If V _O gradually decreases, then judge Whether it is true, if true, it means that the transmission is in the downshift state, and the process ends; if not, it means that the transmission is in the deceleration state within the range, and the process ends.

In order to illustrate the technical solution of the present invention more clearly, take the multi-stage hydraulic-mechanical continuously variable transmission adopted by a certain type of wheeled tractor as an example, and determine the front and rear shifting of the HM3 hydraulic section according to the TCU determination working state flow chart shown in Figure 5 The process is described in detail.

The clutch engagement rules of the HM2-HM4 stages of the multi-stage hydromechanical continuously variable transmission adopted by this type of wheeled tractor are shown in Table 1 below.

Table 1 Clutch Engagement Rules

Number of segments\clutch C1 C2 C3 Cf HM2 + - - + HM3 - + - + HM4 - - + +

In Table 1, + represents that the clutch is connected, and - represents that the clutch is disconnected.

As shown in Table 1, when the multi-stage hydromechanical continuously variable transmission used in this type of wheeled tractor is at HM3, the clutches C2 and Cf are engaged, and the other clutches are disconnected. According to the flow chart 5, the TCU first judges the speed change trend of the HM3 section of the continuously variable transmission.

If the speed in the segment is in a gradual increase trend, then judge the actual output speed V _O of the HM3 segment at this time and the output speed of the segment change size, if It means that the continuously variable transmission is in the acceleration state within the stage at this time, and the engagement state of the clutch does not need to be changed; if Then continue to judge the input speed V _I of the continuously variable transmission and the fluctuation speed of the shifting input input size, if It means that the continuously variable transmission is in the state of preparation before shifting gears at this time. At this time, the TCU issues a command to keep the output speed unchanged, the input speed continues to increase, and the clutch engagement state still does not change; if It means that the continuously variable transmission is in the shifting state. At this time, the TCU sends out instructions to drive the solenoid valves corresponding to the clutches C2 and C3 to make corresponding actions, so that the clutch C2 is disconnected and the clutch C3 is engaged, completing the shift from HM3 to HM4. Upgrade process.

If the output speed in the segment is in a gradually decreasing trend, then judge the actual output speed V _O of the HM3 segment at this time and the output speed of the segment change size, if It means that the continuously variable transmission is in the deceleration state within the section at this time, and the engagement state of the clutch does not need to be changed; if It means that the continuously variable transmission is in the state of shifting. At this time, the TCU sends out instructions to drive the solenoid valves corresponding to the clutches C1 and C2 to make corresponding actions, so that the clutch C2 is disconnected and the clutch C1 is engaged, and the stage is dropped from HM3 to HM2. section process.

Specific embodiments have been given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the present invention, it does not require creative labor to design various deformation models, formulas, and parameters. Changes, modifications, substitutions and variations to the embodiments without departing from the principle and spirit of the present invention still fall within the protection scope of the present invention.

Claims (6)

1. what a kind of Multi-Range Hydro-Mechanical Stepless speed changer changed section control system changes phase method, it is characterised in that：Change section control system System includes the engine (1), contiuously variable transmission (2), the engine control for controlling engine (1) for providing tractor power Unit (3), speed changer electronic control unit (4), speed changer input speed sensor (5) and speed changer output speed sensor (6), institute It states speed changer input speed sensor (5) to be arranged on the input shaft of contiuously variable transmission (2), the speed changer output speed sensing Device (6) is arranged on the output shaft of contiuously variable transmission (2), and the control unit of engine (3), becomes speed changer electronic control unit (4) Fast device input speed sensor (5) and speed changer output speed sensor (6) are connected by a closed CAN bus (7)；

The speed changer electronic control unit (4) includes microprocessor DSP, power module, input signal processing module and output signal Processing module, the input signal processing module include two light-coupled isolation modules being connect respectively with microprocessor DSP and filter Wave processing module, the output signal processing module include the drive module being connect respectively with microprocessor DSP, SPI serial ports with And two light-coupled isolation modules, DC-DC power source conversion module is equipped between the microprocessor DSP and power module, it is described defeated One of enter in signal processing module light-coupled isolation module connection contiuously variable transmission, the drive module and CAN bus (7) Connection；

The phase method that changes includes the following steps：

Step 1 according to the state of contiuously variable transmission determines work segment number R first, calculates R sections of contiuously variable transmission and is changed with R+1 sections Section point output speedR sections are changed section point output speed with R-1 sectionsR sections are changed section point input speed with R+1 sectionsWith it is current Output speed V_O；

Step 2, determine contiuously variable transmission output speed variation tendency and following comparative analysis is carried out to data；

(1) if contiuously variable transmission output speed is in gradually increase trend, and contiuously variable transmission output speedIt is then stepless Speed changer is in acceleration mode in section, and contiuously variable transmission section need not change, and clutch haves no need to change its joint shape State, speed changer electronic control unit control speed changer and continue to work according to the laws about modified speed of setting；

(2) if contiuously variable transmission output speed is in gradually increase trend, and speed changer output speedInput speedThen clutch is in preparation and changes a section state, then speed changer electronic control unit output order, keeps speed changer output speed V_O It is constant, increase speed changer input speed V_I, and speed changer section need not change, clutch haves no need to change its joint shape State；

(3) if contiuously variable transmission output speed is in gradually increase trend, and output speedInput speed Then clutch, which is in, rises section state, then speed changer will rise up into high section from low section, and speed changer electronic control unit is corresponding by controlling Solenoid valve change clutch engagement state, completion change section；

(4) if contiuously variable transmission output speed is in be gradually reduced trend, and output speedThen clutch is in section and subtracts Fast state, speed changer electronic control unit control speed changer and work according to the laws about modified speed of setting, and section need not change, clutch Its engagement state of device haves no need to change；

(5) if contiuously variable transmission output speed is in be gradually reduced trend, and output speedThen clutch is in drop section shape State, then speed changer to fall into low section from high section, speed changer electronic control unit changes clutch also by corresponding solenoid valve is controlled The engagement state of device completes section variation.

2. a kind of Multi-Range Hydro-Mechanical Stepless speed changer as described in claim 1 changes the phase method that changes of section control system, special Sign is：The contiuously variable transmission includes multi gear gear (8), enclosed variable pump-fixed displacement motor transmission system (9) and double The dynamic branch mechanism (10) and power confluence mechanism (11) of planet row form.

3. a kind of Multi-Range Hydro-Mechanical Stepless speed changer as described in claim 1 changes the phase method that changes of section control system, special Sign is：The engine (1) automatically controls rotating speed using electron speed regulator.

4. a kind of Multi-Range Hydro-Mechanical Stepless speed changer as described in claim 1 changes the phase method that changes of section control system, special Sign is：The speed changer input speed sensor (5) and speed changer output speed sensor (6) are all made of magneto-electric sensing Device.

5. a kind of Multi-Range Hydro-Mechanical Stepless speed changer as described in claim 1 changes the phase method that changes of section control system, special Sign is：It is also associated with emergency circuit in the DC-DC power source conversion module.

6. a kind of Multi-Range Hydro-Mechanical Stepless speed changer as described in claim 1 changes the phase method that changes of section control system, special Sign is：R sections of the contiuously variable transmission changes section point output speed with R+1 sectionsR sections are changed a section spot speed with R-1 sectionsR Section changes section point input speed with R+1 sectionsAccording to formula：

Wherein n_eRotating speed is exported for engine,It is speed changer than the upper and lower limitation in corresponding active section R, It is upper and lower limitation of the transmission ratio in correspondence active section R.