WO2021027495A1

WO2021027495A1 - Constant voltage pulse torque converter

Info

Publication number: WO2021027495A1
Application number: PCT/CN2020/103009
Authority: WO
Inventors: 卓见
Original assignee: 卓见
Priority date: 2019-08-13
Filing date: 2020-07-20
Publication date: 2021-02-18
Also published as: CN114901973A; CN114901973B

Abstract

A constant voltage pulse torque converter, comprising: a clamping force system, a pulse torque converter (201), a secondary pressure accumulation system, a cooling system, and a control system. Because the design of constant voltage pulse torque conversion is used, accurate and stepless automatic transmission is truly implemented, and the purpose of reducing energy consumption is achieved. During a torque conversion process, because the secondary pressure accumulation system is independently controllable, manual gear shifting can still be used when the automatic transmission fails, thereby increasing the vehicle stability and avoiding tension loss of a metal belt. Because the clamping force of a pulley and the tension of the metal belt generally remain unchanged during the entire torque conversion process, torque conversion is easier and more flexible, and the impact is reduced. Because the metal belt does not work under ultimate tension, the temperature of the pulley is reduced and the service life of the steel belt is prolonged. Because a pulse encoder is used as the carrier of a gear signal, the mechanical pulse gear signal thereof effectively avoids the trouble of gear signal loss caused by occasional signal interruption. Due to the provision of an AI system, optimal speed ratio schemes can be matched for more working conditions in real time, thereby further reducing energy consumption and providing a foundation for the Internet of Things and autonomous driving. The cooling system is improved, and thus, cooling is more effective. A dynamic pressure CVT and a hydraulic torque converter are provided as the backup of the torque conversion system, and thus, the vehicle can operate more safely. The constant voltage pulse torque converter completely eliminates product defects of CVTs having single or double torque converters caused by occasional "signal interruption".

Description

Constant voltage pulse torque converter

Technical field

The patent of the invention belongs to the field of transmissions, and particularly relates to an automobile continuously variable automatic transmission and its application.

Background technique

The driving performance of a vehicle depends not only on the engine, but also on the transmission and the matching between the transmission and the engine. The speed of the car is constantly changing during the driving process. In order to achieve the optimal matching of the power between the engine and the transmission, Better economy and power, as well as further reduction in exhaust emissions, require that the gear ratio of automobile gearboxes should be as wide as possible; with the birth of the continuously variable transmission (CVT), this goal has been gradually achieved Realization, the transmission of CVT is composed of metal belt, driving cone wheel, driven cone wheel, hydraulic clamping force system, sensor, wiring harness and TCU. According to the output characteristics of the engine, TCU eliminates the other by adjusting the main and driven cone wheels. The long diameter change produces a continuously changing speed ratio to adapt to the changing load of the car and make the engine work in the desired mode; it improves the economy and power of the car while reducing emissions; in addition, the CVT also It can simplify the operation of the driver, reduce driving fatigue, and improve driving safety; compared with the four-element automatic transmission, the CVT system can increase the acceleration performance by 10% and the fuel economy by 10%-15%; especially the electro-hydraulic type Metal belt CVT, with high transmission efficiency ratio, high power, small and compact structure, and wide application range, has become the best choice for automotive gearboxes from the comprehensive consideration of production cost, reliability and performance.

technical problem

The current electro-hydraulic metal belt CVT is single and double torque-variable dynamic pressure CVT. The CVT adopts the stepless automatic transmission in the virtual gear range. Its development has only been more than 20 years. There are still many unstable factors in the use process, especially the effect The clamping force system on the cone wheel is very fragile, and it always works under dynamic high pressure. As long as any part of the electro-hydraulic control system, especially the sensor and wiring harness, has a failure, or even the occasional poor contact of the plug The loss of the gear position signal causes the torque converter to be at a loss. If the gear position is too high, the engine will be stuck and damaged due to insufficient speed. If the gear position is too low, the engine will cause the metal belt to slip due to the high speed, and the metal belt will slip. Even if it happens once, the transmission can be scrapped, which can easily cause major traffic accidents; and it is impossible to prevent the electro-hydraulic system components of all batches of vehicles from malfunctioning for a long time. The failure rate of single torque converter CVT has been high; Although the company optimizes the gearbox control strategy, when the TCU does not receive a signal for about 1 second, it will automatically disconnect the clutch, leaving the vehicle in a state of coasting and power interruption in D gear, which protects the gearbox to a certain extent, but High-speed coasting is enough to cause the clutch to heat up and burn out, and the braking effect of the vehicle is poor; therefore, the single-torque CVT cannot meet the basic safety needs of drivers in high-speed working conditions. Recently, a large number of vehicles have been recalled due to power interruption. And it cannot be solved by repairing and replacing parts, which has become an incurable disease; its case value is huge, and it has brought huge damage to the country and society.

Technically, a CVT vehicle must have a backup torque conversion system to take over the torque conversion work when the gear signal is lost due to "data interruption" and "data lag"; the current method is to install a hydraulic system between the CVT and the engine. Torque converter; Patent CN104214332A discloses a hydraulic control system for controlling a continuously variable transmission, including a torque converter TCC, including: a pressure accumulator system with an accumulator, a temperature reduction system with an oil cooler subsystem, and a pressure accumulator system Including accumulator 186, accumulator 133, and solenoid 184. The controller 301 can be a transmission control module. The cooling system is responsible for providing the oil temperature of the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder in a reasonable state, and the torque converter TCC is responsible for providing the variable pitch force of the pulley under constant pressure. Although this avoids the unstable factors of the metal belt tension in the dynamic pressure state, when the vehicle is accelerating rapidly, due to the buffering effect of the hydraulic torque converter, the sensitivity of the torque converter is not high, and the engine speed fluctuates greatly. High consumption; when the gearbox fails, due to the limited pitch accuracy of the hydraulic torque converter, it cannot continue to drive normally only by relying on the hydraulic torque converter; and due to the limited torque range of the hydraulic torque converter, under high-speed working conditions In the event of a failure, the torque converter alone cannot reduce the gear to the ideal low-gear state. If the brake is forced to stop, it is very easy to cause the brake pads to burn and the metal belt to slip, resulting in damage to the gearbox; double torque converter CVT avoids The occurrence of "power interruption" has been solved, and the problem of what to do after "data interruption" occurs; if a method can be found that will not affect the operation of the gearbox even if a "data interruption" occurs, it will be done once and for all.

Technical solutions

A constant voltage pulse torque converter, which is characterized by comprising: a clamping force system, a pulse torque converter, a two-stage pressure accumulating system, a cooling system and a control system; wherein the clamping force system is connected to the pulse torque converter and is responsible for Perform torque conversion tasks; the secondary pressure accumulation system is connected to the clamping force system and is responsible for providing the clamping force of the cone wheel. The cooling system is connected to the clamping force system and is responsible for cooling the cone wheel close to the temperature; the control system is responsible for the entire torque conversion system Intelligent control.

The above-mentioned constant-voltage pulse torque converter is further characterized in that the pulse torque converter is composed of a torque-changing hydraulic cylinder, a transmission structure, a two-way piston, a stepping motor, a torque-changing isolation valve, and a torque-changing guide tube The transmission mechanism is composed of a central shaft, a gear set, a double rack, a fixed chute and a manual shift gear. The fixed chute is arranged in the torque-changing hydraulic cylinder, and the two-way piston is provided with Double rack, the stepper motor is connected to the gear set through the central shaft; the stepper motor drives the bidirectional piston to move in the torque-changing hydraulic cylinder, and the two ends of the torque-changing hydraulic cylinder will produce volume changes in one order and another; When the two-way piston moves to the driving cone wheel, the radius of the driving wheel increases and is restricted by the binding force of the metal belt. The driven cone wheel moves backward at the same time, and the radius of the driven wheel decreases simultaneously. At this time, it is in an accelerating state. The moving cone wheel moves, showing a decelerating state. The clamping force of the cone wheel and the tension of the metal belt remain unchanged during the entire torque conversion process; in order to improve the accuracy of the torque conversion, the cross section of the driving wheel hydraulic cylinder is the horizontal of the torque conversion hydraulic cylinder. Integer multiples of cross-sectional area.

The above-mentioned constant pressure pulse torque converter is also characterized in that the secondary pressure accumulating system is composed of a secondary pressure accumulating cylinder, a secondary cylinder isolation valve, a master balancing valve, a slave balancing valve, a main cabin shut-off valve, and a slave cabin The stop valve, the slave return stop valve and the slave return pipe are responsible for providing tension to the metal belt and also have the function of exhaust and cleaning; the middle of the secondary pressure accumulator is equipped with a secondary isolation valve, and one end is equipped with a main balance valve, The main compartment shut-off valve is connected with the active cone wheel cylinder through a duct, and the other end is provided with a slave balance valve, a slave compartment shut-off valve, a slave return stop valve and a slave return pipe, and is connected with the driven cone wheel cylinder through the duct.

The above-mentioned constant pressure pulse torque converter is also characterized in that the cooling system is composed of a main cooler, a main flow device, a slave cooler, a slave flow guide and a connecting pipe, and is responsible for the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder. The oil temperature of the cylinder is in a reasonable state. The main cooler and the main flow device are connected with the driving cone wheel and are responsible for the close cooling of the driving cone wheel; the slave cooler and the slave flow deflector are connected with the driven cone wheel and are responsible for the driven cone wheel. The close of the wheel cools down.

The above-mentioned pulse torque converter is also characterized in that the pulse torque converter has a gear lock function. When the torque converter shut-off valve is closed and the torque converter isolation valve is opened, the oil at both ends of the pulse torque converter is connected. The hydraulic cylinder of the driving wheel has the same oil pressure, and the torque conversion function disappears into the locked state; when the torque conversion isolation valve is closed and the torque conversion cut-off valve opens, both ends of the pulse torque converter are hydraulically isolated, and the torque conversion function is restored to the unlocked state.

The above-mentioned pulse torque converter is also characterized in that the pulse encoder adopts an absolute multi-turn encoder, its mechanical position signal and reading method, the gear position signal does not need to be memorized, and the gear position caused by the occasional signal interruption is avoided The trouble of having to stop and restart when the signal is lost.

The above-mentioned constant voltage pulse torque converter is also characterized in that the control system includes an AI system, which is composed of an AI module, a data module, and a touch screen module; wherein the AI module has learning, analysis, memory storage, and matching of historical data And application functions, as well as the automatic safety limit function under special working conditions; the data module is a database based on the target input speed of the engine; the generation method is: vehicle speed, load, road conditions, weather, driving technology and driving mode as dimensions , To comprehensively calculate the performance effects of vehicle stability, safety, comfort, and energy consumption under various working conditions to generate the optimal target input speed value and safety limit value; the AI module has a voice servo Function, a voice recognition button is installed on the steering wheel, when you press and hold the voice recognition button, you can issue a voice command to implement the function of the designated gear; the touch screen module has a Bluetooth function, and the upper gear can be completed by touching the corresponding gear button The automatic lifting gear.

The above-mentioned constant voltage pulse torque converter is also characterized in that the control system also includes a torque converter control system, which uses a calculation method based on the output speed. When the vehicle starts, the AI module Match the optimal target input speed from the database to the TCU, then generate the target speed ratio according to the real-time output speed, and further generate the target speed ratio pulse value; then read the stepper motor pulse value from the pulse encoder to further generate the real-time speed Ratio pulse value, and then subtract the target speed ratio pulse value and the real-time speed ratio pulse value to obtain the target pulse variable; subtract the real-time input speed and the target input speed to generate the throttle speed difference, and calculate the throttle pulse variable, and then the throttle The pulse variable and the target pulse variable are added to generate the total dynamic pulse variable; further generate the target pulse variable of the stepper motor, and then the stepper motor completes the movement of the pulse variable to obtain the ideal real-time output speed.

The above-mentioned constant voltage pulse torque converter is also characterized in that the control system also includes a fault detection system, under the same target operating condition, by determining whether the difference between the real-time speed ratio pulse value and the target speed ratio pulse value is Determine whether the entire pulse torque converter is faulty within the preset range. Determine whether the stepper motor segment is faulty by determining whether the difference between the target pulse variable of the stepper motor and the actual variable of the stepper motor pulse is within the preset range , By determining whether the difference between the target movement value of the two-way piston and the actual movement value of the two-way piston is within the preset range to determine whether there is a fault in the transmission section, and by determining whether the difference between the target movement value of the cone wheel and the actual movement value of the cone wheel is Within the preset range, judge whether there is a fault in the clamping force system segment.

The above-mentioned constant voltage pulse torque converter is also characterized in that the control system further includes a fault emergency system, and a hydraulic torque converter is arranged between the gearbox and the engine. When the vehicle is running normally, the hydraulic torque converter Acting as a hydraulic coupler, it does not participate in torque conversion. When the engine speed is lower than the set value under vehicle starting, parking and emergency conditions, it will automatically turn on to participate in torque conversion work; when the occasional gear signal is interrupted, the pulse torque converter enters When the gear is locked, the torque converter automatically starts to take over the temporary torque conversion task. When the limit condition is released after a period of travel, the system reads the gear position signal again, and the torque converter enters the hydraulic coupler state, and the torque converter is pulsed. When the pulse torque converter fails to perform automatic torque conversion, the dynamic pressure CVT will automatically start, and the vehicle will drive in the middle and low speed limit gears. When the dynamic pressure CVT also fails, the hydraulic torque converter will automatically start, and Prompt the driver to perform harmless braking to stop.

Beneficial effect

The constant voltage pulse torque converter provided by the patent of the present invention includes: a clamping force system, a pulse torque converter, a two-stage pressure accumulating system, a temperature reduction system and a control system; compared with the prior art, due to the adoption of The design of constant voltage pulse torque conversion truly realizes precise stepless automatic transmission to reduce energy consumption; during the torque conversion process, the secondary pressure accumulation system is independently controllable, and manual transmission can still be used when the automatic transmission fails. This increases the stability of the vehicle and avoids the loss of tension of the metal belt; since the clamping force of the pulley and the tension of the metal belt remain the same throughout the torque conversion process, this makes the torque conversion easier and more flexible and reduces Impact; because the metal belt does not work under the limit tension, it also reduces the temperature of the pulley and extends the life of the steel belt; because the pulse encoder is used as the carrier of the gear signal, its mechanical pulse gear signal effectively avoids The trouble of gear signal loss due to occasional signal interruption; due to the installation of the AI system, the optimal speed ratio solution for more working conditions can be matched in real time, which further reduces energy consumption and provides a foundation for the Internet of Things and autonomous driving ; Because of the improved cooling system, the cooling is more close and effective; because the dynamic pressure CVT and hydraulic torque converter are set as the backup of the torque conversion system, the vehicle operation is safer; the constant voltage pulse torque converter completely eliminates the single, Product defect caused by the occasional "signal interruption" of the double torque converter CVT.

Description of the drawings

Figure 1 is a schematic front sectional view of the structure of the pulse torque converter of the invention patent;

Figure 2 is a schematic cross-sectional view of the P1-P2 structure of the pulse torque converter of the present invention;

Figure 3 is an enlarged vertical cross-sectional schematic diagram of the structure of the pulse torque converter P3-P4 of the invention patent;

Figure 4 is a schematic diagram of the control system of the constant voltage pulse torque converter of the invention patent;

Figure 5 is a schematic diagram of the structure of the constant voltage pulse torque converter of the invention patent;

Among them: 101. Metal belt, 102. Active cone wheel, 103. Active cone wheel cylinder, 104. Main cooler, 105. Main flow device, 106. Cylinder isolation valve, 107. Driven cone wheel, 108. Slave Moving cone wheel hydraulic cylinder, 109. Slave cooler, 110. Slave flow deflector, 111. Cylinder connecting pipe; 201. Pulse torque converter, 202. Torque variable isolation valve, 203. Bidirectional piston, 204. Stepping Motor, 205. Variable torque hydraulic cylinder, 206. Bottom shaft, 207. Gear set, 208. Double rack, 209. Fixed chute, 210. Variable torque stop valve, 211. Variable torque guide tube, 212 .Manual gear; 301. Cylinder, 302. Cylinder cooler, 303. Primary accumulator, 304. Secondary accumulator, 305. Oil pump, 306. Master balance valve, 307. Slave balance valve, 308. Slave Compartment shut-off valve, 309. Secondary cylinder isolation valve, 310. Main compartment shut-off valve, 311. Slave return stop valve, 312. Main return pipe, 313. Slave return pipe, 314. Overflow valve;

1000.AI module, 1100. Data module, 1200. Target input speed, 1300. Target speed ratio, 1400. Target speed ratio pulse value, 1500. Target pulse variable; 2000. TCU, 2100. Dynamic throttle speed, 2300. Throttle pulse Variable, 2400. Stepper motor pulse value, 2500. Real-time speed ratio pulse value, 2600. Dynamic speed ratio total variable; 3100. Stepper motor target pulse variable, 3200. Stepper motor actual pulse variable, 3300. Bidirectional piston target movement Value, 3400. Bidirectional piston actual movement value, 3500. Moving wheel target movement value, 3600. Cone wheel actual movement value, 3700. Pulse encoder, 3800. Real-time output speed; 4000. Real-time speed ratio pulse value and target speed ratio pulse value Difference, 4100. The difference between the target input speed and the dynamic throttle speed, 4200. The difference between the target pulse variable of the stepper motor and the actual pulse variable of the stepper motor, 4300. The difference between the target movement value of the bidirectional piston and the actual movement value of the bidirectional piston Value, 4400. The difference between the target movement value of the cone wheel and the actual movement value of the moving wheel.

The best mode of the invention

In order to overcome the limitations of the existing hydraulic system of CVT cars, meet people's basic safety requirements for driving, and achieve better performance, the purpose of the present invention is to provide an energy-saving, safe and intelligent constant voltage pulse torque converter and assembly.

As shown in Figure 1-5, the patented constant voltage pulse torque converter of the present invention includes: a clamping force system, a pulse torque converter 201, a secondary pressure accumulating system, a cooling system and a control system; the clamping force system and pulse The torque converter is connected to perform the torque conversion task; the secondary pressure accumulating system is connected to the clamping force system to provide the clamping force of the cone wheel, and the cooling system is connected to the clamping force system to cool the cone wheel close to it; control system Responsible for the intelligent control of the entire torque converter system.

The clamping force system consists of a metal belt 101, a driving cone wheel 102, a driving cone wheel cylinder 103, a driven cone wheel 107, a driven cone wheel cylinder 108, a cylinder connecting pipe 111 and a conduit; the pulse change The torque converter 201 is composed of a torque-changing hydraulic cylinder 205, a transmission structure, a pulse encoder 3700, a stepping motor 204, a bidirectional piston 203, a torque-changing isolation valve 202, and a torque converter guide tube 211. The transmission mechanism is composed of a central shaft 206, a gear set 207, a double rack 208, a fixed slide groove 209 and a manual shift gear 212, the fixed slide groove 209 is arranged in the torque-changing hydraulic cylinder 205, the two-way piston 203 is provided with a double rack 208, and a stepping motor 204 is connected to the gear set 207 through the central shaft 206. When the two-way piston 203 moves in the torque-changing hydraulic cylinder 205, the two ends of the torque-changing hydraulic cylinder 205 synchronously produce volume changes from one to the other, and the two-way piston 203 moves toward the driving cone. When the wheel 102 moves, the radius of the driving cone wheel 102 increases, and is restricted by the binding force of the metal belt 101. The driven cone wheel 107 moves backward at the same time, and the radius of the driven wheel 107 decreases simultaneously. At this time, it is in an accelerating state, and vice versa. Move to the driven bevel wheel 107, presenting a deceleration state, the clamping force of the bevel wheel and the tension of the metal belt 101 remain unchanged during the entire torque change process, the manual gear 212 is connected to the central shaft 206; the pressure accumulation system It is composed of secondary pressure accumulator 304, secondary cylinder isolation valve 309, master balance valve 306, slave balance valve 307, master compartment shut-off valve 310, slave compartment shut-off valve 308, slave return shut-off valve 311 and slave return pipe 313, responsible for Provides a stable clamping force to the driving wheel, and has the function of cleaning and exhausting; the cooling system is composed of the main cooler 104, the main flow device 105, the slave cooler 109, the slave flow guide 110 and the connecting pipe, which is responsible for the active The oil temperature of the cone wheel cylinder 103 and the driven cone wheel cylinder 108 are in a reasonable state; the control system is composed of a torque conversion control system, an AI system, a fault detection system, and an emergency treatment system, and is responsible for the gearbox in an ideal state Run down. In order to improve the accuracy of the torque change, the cross section of the driving wheel cylinder is an integer multiple of the cross section area of the torque change cylinder.

Among them, the torque converter isolation valve 202 of the pulse torque converter 201 has lock and unlock functions. When the torque converter shut-off valve 210 is closed and the torque converter isolation valve 202 is opened, the oil at both ends of the pulse torque converter 201 is connected. The oil pressures of the driving wheel cylinder 103 and the driven wheel cylinder 108 are the same, and the torque conversion function disappears into the locked state; when the torque converter isolation valve 202 is closed, the torque converter shut-off valve 210 is opened, and the pulse torque converter 201 ends The oil is isolated and the torque conversion function is restored to the unlocked state.

Among the above, the pulse encoder 3700 of the pulse torque converter 201 is an absolute multi-turn encoder. Its mechanical position ensures the uniqueness of the gear signal. It does not need to be memorized and only needs to be read directly, which prevents the control system from being interrupted by the signal. influences.

Among the above, the AI system of the control system includes: an AI module 1000, a data module 1100, and a touch screen module; the AI module 1000 has the functions of learning, analyzing, memory storage, matching and application of historical data, including safety under special working conditions Gear-limiting function; the data module 1100 is a database based on the target input speed of the engine operating conditions. The method is: taking the vehicle speed, load, road conditions, weather, driving technology and driving mode as the dimensions, and the vehicle under various operating conditions The performance effects of stability, safety, comfort, and power consumption are comprehensively calculated to generate the optimal operating condition target input speed value; the AI module 1000 has a voice servo function, and a voice recognition button is installed on the steering wheel. Press and hold the voice recognition button to issue a voice command to implement the function of the designated gear; the touch screen module has a Bluetooth function, and it can automatically up and down in the upper gear by touching the corresponding gear key.

Among the above, the control system also includes a torque conversion control system, which uses a calculation method based on the output speed. When the vehicle starts, the AI module 1000 first selects the matching engine target input speed 1200 from the database according to the working conditions and environment. TCU 2000, according to the real-time output speed of 3800, generates a target speed ratio of 1300, and further generates a target speed ratio pulse value of 1400; then reads the stepper motor pulse value 2400 from the pulse encoder 3700, and further generates a real-time speed ratio pulse value of 2500, Then subtract the target speed ratio pulse value 1400 and the real-time speed ratio pulse value 2500 to generate the target pulse variable 1500; subtract the dynamic throttle speed from the target input speed 1200 to generate the throttle speed difference, and calculate the throttle target pulse variable 2300, and then Adding the throttle target pulse variable 2300 and the target pulse variable 1500 to generate a dynamic pulse total variable 2600; further generating a stepper motor target pulse variable 3100, the stepper motor 204 completes the pulse variable to obtain the ideal real-time output speed.

Among the above, the control system also includes a fault detection system. Under the same target operating condition, determine whether the difference between the real-time speed ratio pulse value 2500 and the target speed ratio pulse value 1400 is within a preset range to determine the entire pulse change Whether there is a fault in the torque converter 201, by determining whether the difference between the target pulse variable 3100 of the stepper motor and the actual pulse variable 3200 of the stepper motor is within the preset range, to determine whether there is a fault in the 204 section of the stepper motor, by determining the bidirectional piston target Whether the difference between the movement value 3300 and the actual movement value of the two-way piston 3400 is within the preset range is used to determine whether there is a fault in the transmission section. By determining whether the difference between the target movement value of the cone wheel 3500 and the actual movement value 3600 of the cone wheel is within the preset range Set within the range to judge whether there is a fault in the clamping force system segment.

Among the above, the control system also includes a fault emergency system, and a torque converter is provided between the gearbox and the engine. When the vehicle is running normally, the torque converter acts as a hydraulic coupler and does not participate in torque conversion; When the vehicle starts, stops, and when the engine speed is lower than the set value in emergency conditions, it is automatically turned on to participate in torque conversion work. When waiting for a traffic light to stop temporarily, under the action of the torque converter, the vehicle can be parked without braking. Make the start and parking more smooth; when there is an occasional "signal interruption" under extreme conditions, the pulse torque converter will enter the locked state, and the hydraulic torque converter will automatically start to take over the temporary torque conversion task. After the condition is removed, the system first reads the gear signal again, and then the hydraulic torque converter enters the hydraulic coupling state, and then the pulse torque converter is unlocked and continues to work; when the pulse torque converter fails to perform automatic torque conversion, it will move The pressure CVT starts automatically, and the vehicle drives in low and medium speed limited gears. When the dynamic pressure CVT also fails, the hydraulic torque converter automatically starts, and the driver is prompted to perform harmless braking to stop.

Embodiments of the invention

As shown in Figure 1-5, when applied to a car, after starting the vehicle, the vehicle starts to enter the preheating stage. First, the balance valve 307 and the secondary cylinder isolation valve 309 are closed, the hydraulic cylinder isolation valve 106 is opened, and the oil pump 305 is The oil drawn from the oil cylinder 301 enters the primary pressure accumulating cylinder 303, a part of the oil enters the secondary pressure accumulating cylinder 304 through the main balance valve 306, and then the oil passes through the active cone wheel cylinder 103, the main cooler 104, and the main flow device. 105, return to the driving cone wheel cylinder 103, and then sequentially enter the driven cone wheel cylinder 108 through the cylinder guide tube 111, from the cooler 109, from the deflector 110 and then back to the driven cone wheel cylinder 108, Then it passes through the driven cone stop valve 308, the secondary pressure accumulating cylinder 304, the return pipe 313 and finally returns to the oil cylinder 301 to preheat and clean the CVT body; then the torque converter isolation valve 202, the torque converter The shut-off valve 210 is opened, and the oil flows through the torque-changing guide tube 211 and the torque-changing hydraulic cylinder 205 to preheat, clean and exhaust the constant pressure torque converter 201.

After preheating, the metal belt 101 obtains the rated initial tension and stores energy therein, the distance changer isolation valve 202, the main compartment shut-off valve 310 and the slave compartment shut-off valve 308 are closed, and the clutch is closed and the vehicle starts to start. According to the real-time operating conditions, First, the AI module 1000 matches the optimal target input speed of 12000 from the database to the TCU 2000, and then generates the target speed ratio of 1300 according to the real-time output speed of 3800, and further generates the target speed ratio pulse value of 1400; then reads from the pulse encoder 3700 Take the stepper motor pulse value 2400, and further generate the real-time speed ratio pulse value 2500, and then subtract the target speed ratio pulse value 1400 and the real-time speed ratio pulse value 2500 to obtain the target pulse variable 1500; the dynamic throttle speed 2100 and the target input speed 1200 Subtract to generate the throttle speed difference, and calculate the throttle pulse variable 2300, then add the throttle pulse variable 2300 and the target pulse variable 1500 to generate the dynamic pulse total variable 2600; further generate the stepper motor target pulse variable 3100, by the stepper motor 204 completes the pulse variable and obtains the ideal real-time output speed. When the temperature of the oil in the oil cylinder 301 rises above 60 degrees Celsius, the oil cylinder cooler 302 performs temperature reduction.

When the vehicle detects special working conditions such as sharp turns, climbing, rain and snow, the AI system automatically matches the optimal working condition target input speed plan from the database to execute safe limit gear driving, and can move up and down within the safe limit gear range , When the emergency situation needs to be cancelled, just press and hold the control button on the steering wheel to terminate, release the button to resume execution immediately. When the vehicle detects a small short slope and other working conditions that require the clamping force to be pressurized, the TCU will automatically issue a command to pressurize the clamping force of the cone wheel. First, a pressure adjustment command is issued to the balance valve 307 to make the secondary pressure accumulate The pressure of the cylinder 304 is increased to a predetermined value; then the variable-pitch force isolation valve 202 is connected, and the variable-pitch force shut-off valve 210 is closed at the same time. At this time, the stepping motor 204 and the bidirectional piston 20 are in a stopped state; finally the TCU sends out the opening of the main compartment shut-off valve The command of 310 and slave shut-off valve 308 immediately completes the pressurization task; after the special working condition is removed, the slave balance valve 307 is closed, and the pressure composition is reversed; when a large long slope or steep slope is detected, the TCU will change the constant pressure torque The device 201 issues a downshift command. This design reduces the trouble of frequent upshifts and downshifts under the premise of safety.

When the constant pressure torque conversion system fails to perform correct torque conversion, the TCU will automatically activate the backup dynamic pressure CVT torque conversion system. First, the torque conversion isolation valve 202 is connected, the variable distance force stop valve 210 is closed, and the constant pressure distance converter 201 Stop working; then the secondary cylinder isolation valve 309 is closed, the primary pressure accumulating cylinder 303 provides clamping force to the driving cone 102 through the main balancing valve 306, and the primary pressure accumulating cylinder 303 provides the driven cone 102 through the slave balancing valve 307 107 clamping force; TCU matches the best speed ratio according to the working conditions, and sends pressure adjustment commands to the main balance valve 306 and the slave balance valve 307 respectively. The driving cone wheel 102 and the driven cone wheel 107 are pressure-changed, and the TCU provides real-time feedback , By adjusting the pressure in the main and driven cone wheel cylinders to achieve the actual speed ratio tracking the target speed ratio, further matching the optimized dynamic speed ratio, so that the gearbox works along the target working line, and the gearbox executes dynamic hydraulic pressure The torque conversion function of the system enables the vehicle to drive safely in the middle and low gears; if the backup dynamic pressure torque conversion system also fails, the hydraulic torque converter automatically starts and prompts the driver to perform harmless braking to stop.

Industrial applicability;

The constant voltage pulse torque converter defined in the patent of the invention can be used to produce continuously variable automatic transmissions for automobiles.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. The constant voltage pulse torque converter defined in this article can also be implemented in other types of CVT motor vehicle embodiments. The patent of the present invention will not be limited to the embodiments shown herein, but shall conform to the widest scope consistent with the principles disclosed herein.

Claims

A constant voltage pulse torque converter, which is characterized by comprising: a clamping force system, a pulse torque converter, a two-stage pressure accumulating system, a cooling system and a control system; wherein the clamping force system is connected to the pulse torque converter and is responsible for Perform torque conversion tasks; the secondary pressure accumulation system is connected to the clamping force system and is responsible for providing the clamping force of the cone wheel. The cooling system is connected to the clamping force system and is responsible for cooling the cone wheel close to the temperature; the control system is responsible for the entire torque conversion system Intelligent control.
The constant voltage pulse torque converter according to claim 1, further characterized in that the pulse torque converter consists of a torque-changing hydraulic cylinder, a transmission structure, a bidirectional piston, a stepping motor, a torque-changing isolation valve and a The moment guide tube is composed of the torque converter, which is responsible for providing the torque; the transmission mechanism is composed of the bottom bracket, the gear set, the double rack, the fixed chute and the manual shift gear. The fixed chute is set in the torque-changing hydraulic cylinder, There is a double rack on the bidirectional piston, and the stepping motor is connected with the gear set through the middle shaft; the stepping motor drives the bidirectional piston to move in the torque-changing hydraulic cylinder, and the two ends of the torque-changing hydraulic cylinder will lose each other. When the two-way piston moves to the driving cone wheel, the radius of the driving wheel increases, which is restricted by the binding force of the metal belt. The driven cone wheel moves backward at the same time, and the radius of the driven wheel decreases simultaneously, and it is in an accelerated state at this time. When the bidirectional piston moves to the driven cone wheel, it is in a decelerating state, and the clamping force of the cone wheel and the tension of the metal belt remain unchanged in the whole torque conversion process.
The constant pressure pulse torque converter according to claim 1, further characterized in that the secondary pressure accumulation system consists of a secondary pressure accumulation cylinder, a secondary cylinder isolation valve, a master balance valve, a slave balance valve, and a master cabin. The shut-off valve, the shut-off valve from the cabin, the shut-off valve from the return pipe and the return pipe are responsible for providing tension to the metal belt and have the function of exhaust and cleaning. Among them, there is a secondary isolation valve in the middle of the secondary pressure accumulator, and one end The main balance valve and the main compartment shut-off valve are connected to the active cone wheel cylinder through a pipe, and the other end is provided with a slave balance valve, a slave compartment shut-off valve, a slave return stop valve and a slave return pipe, which are connected to the driven cone wheel cylinder through the duct Connected.
The constant voltage pulse torque converter according to claim 1, wherein the cooling system is composed of a main cooler, a main flow device, a slave cooler, a slave flow guide and a connecting pipe, and is responsible for the driving wheel fluid The oil temperature of the cylinder and the driven wheel fluid cylinder is in a reasonable state, among which the main cooler and main flow device are connected with the driving cone wheel and are responsible for the close cooling of the driving cone wheel; the slave cooler and the slave flow deflector are connected with the driven cone wheel , Responsible for the close cooling of the driven cone wheel.
The pulse torque converter according to claim 2, wherein the pulse torque converter has a lock function, when the torque converter shut-off valve is closed and the torque converter isolation valve is opened, the oil at both ends of the pulse torque converter is connected , Due to the same hydraulic pressure of the main and driven wheel cylinders, the torque conversion function disappears into the locked state; when the torque conversion isolation valve is closed, the torque conversion cut-off valve is opened, the two ends of the pulse torque converter are hydraulically isolated, and the torque conversion function is restored Is unlocked.
The pulse torque converter according to claim 2, characterized in that the pulse encoder adopts an absolute multi-turn encoder, its mechanical position signal and reading method, the gear signal does not need to be memorized, avoiding accidental The signal interruption leads to the loss of the gear signal and the trouble of having to stop and restart when reacquired.
The constant voltage pulse torque converter according to claim 1, wherein the control system includes an AI system, which is composed of an AI module, a data module, and a touch screen module; wherein the AI module has learning and analysis of historical data , Memory storage, matching and application functions, as well as automatic safety limit function under special working conditions; the data module is a database based on the engine target input speed; the generation method is: vehicle speed, load, road conditions, weather, driving technology And the driving mode is the dimension, which comprehensively calculates the performance effects of stability, safety, comfort and energy consumption of the vehicle under various working conditions, and generates the optimal target input speed value and safety limit value; The AI module has a voice servo function, and a voice recognition button is installed on the steering wheel. When you press and hold the voice recognition button, you can issue a voice command to implement the designated gear function; the touch screen module has a Bluetooth function, which can be completed by touching the corresponding gear button Automatic up/down gear in the upper limit gear.
The constant voltage pulse torque converter according to claim 1, wherein the control system further comprises a torque converter control system, which uses a calculation method based on the output speed. In the environment, the AI module matches the optimal target input speed from the database to the TCU, and then generates the target speed ratio according to the real-time output speed, and further generates the target speed ratio pulse value; then reads the stepper motor pulse value from the pulse encoder , Further generate the real-time speed ratio pulse value, and then subtract the target speed ratio pulse value and the real-time speed ratio pulse value to obtain the target pulse variable; subtract the real-time input speed and the target input speed to generate the throttle speed difference, and calculate the throttle pulse Variables, and then add the throttle pulse variable and the target pulse variable to generate the dynamic pulse total variable; further generate the stepper motor target pulse variable, and then the stepper motor completes the movement of the pulse variable to obtain the ideal real-time output speed.
The constant voltage pulse torque converter according to claim 1, wherein the control system further comprises a fault detection system, under the same target operating conditions, by determining the real-time speed ratio pulse value and the target speed ratio pulse value To determine whether the entire pulse torque converter is faulty, whether the difference value is within the preset range, and to determine whether the difference between the target pulse variable of the stepper motor and the actual pulse variable of the stepper motor is within the preset range. Whether there is a fault in the motor section, determine whether there is a fault in the transmission section by determining whether the difference between the target movement value of the two-way piston and the actual movement value of the two-way piston is within the preset range. Whether the difference of the value is within the preset range to judge whether there is a fault in the clamping force system segment.
The constant voltage pulse torque converter according to claim 1, wherein the control system further comprises a fault emergency system, and a hydraulic torque converter is arranged between the gearbox and the engine, and the vehicle is running normally , The hydraulic torque converter acts as a hydraulic coupler and does not participate in torque conversion. When the engine speed is lower than the set value under vehicle starting, parking and emergency conditions, it will automatically turn on to participate in torque conversion work; When the signal is interrupted”, the pulse torque converter enters the gear-locked state, and the hydraulic torque converter automatically starts to take over the temporary torque-changing task. When the extreme working condition is released for a period of time, the system first reads the gear signal again, and then the hydraulic torque converter The torque converter enters the fluid coupling state, and then the pulse torque converter is unlocked and continues to work; when the pulse torque converter fails to perform automatic torque conversion, the dynamic pressure CVT will automatically start, and the vehicle will drive in the middle and low speed limit gears, when the dynamic pressure CVT A malfunction also occurred, the torque converter was automatically started, and the driver was prompted to perform harmless braking to stop.