阅读说明：本技术 一种无级变速器金属带带环失效控制装置及方法 (Failure control device and method for metal belt ring of continuously variable transmission ) 是由 刘金刚 王高升 肖培杰 傅兵 何丽红 赵又红 陈建文 于 2020-12-01 设计创作，主要内容包括：本发明公开了一种无级变速器金属带带环失效控制装置及方法,控制装置包括摄像头、无级变速器、控制装置和失效计算单元；所述的摄像头设于无级变速器主动轮轴和从动轮轴之间,摄像头的镜头轴线与主动轮轴的轴线平行,镜头正对无级变速器金属带带环；控制装置包括TCU控制器、电机控制器和失效计算单元,电机控制器与失效计算单元连接,失效计算单元与TCU控制器连接,TCU控制器与无级变速的液压系统连接；失效计算单元与摄像头相连,接收来自摄像头捕捉的带环跳动信号值。本发明结构简单,成本低下,能够降低高转速条件下无级变速器金属带断裂失效的风险,并保障无级变速器可以被应用于电动汽车上。(The invention discloses a device and a method for controlling failure of a metal belt ring of a continuously variable transmission, wherein the control device comprises a camera, the continuously variable transmission, a control device and a failure calculation unit; the camera is arranged between the driving wheel shaft and the driven wheel shaft of the continuously variable transmission, the axis of a lens of the camera is parallel to the axis of the driving wheel shaft, and the lens is over against the metal belt ring of the continuously variable transmission; the control device comprises a TCU controller, a motor controller and a failure calculation unit, wherein the motor controller is connected with the failure calculation unit, the failure calculation unit is connected with the TCU controller, and the TCU controller is connected with a stepless speed change hydraulic system; the failure calculation unit is connected with the camera and receives the belt loop jumping signal value captured by the camera. The invention has simple structure and low cost, can reduce the risk of the fracture failure of the metal belt of the continuously variable transmission under the condition of high rotating speed, and ensures that the continuously variable transmission can be applied to the electric automobile.)

1. A failure control device for a metal belt ring of a continuously variable transmission is characterized in that: the device comprises a camera, a continuously variable transmission, a control device and a failure calculation unit; the camera is arranged between the driving wheel shaft and the driven wheel shaft of the continuously variable transmission, the axis of a lens of the camera is parallel to the axis of the driving wheel shaft, and the lens is over against the metal belt ring of the continuously variable transmission; the control device comprises a TCU controller, a motor controller and a failure calculation unit, wherein the motor controller is connected with the failure calculation unit, the failure calculation unit is connected with the TCU controller, and the TCU controller is connected with a stepless speed change hydraulic system; the failure calculation unit is connected with the camera and receives the belt loop jumping signal value captured by the camera.

2. A continuously variable transmission metal belt loop failure control method using the continuously variable transmission metal belt loop failure control apparatus of claim 1, comprising the steps of:

1) detecting the up-down jumping amount and the left-right jumping amount of a metal belt ring through a camera, and calculating the up-down jumping adjustment amount and the left-right jumping adjustment amount of the metal belt ring by a failure calculation unit according to the up-down jumping amount threshold value and the left-right jumping amount threshold value of the metal belt ring respectively;

2) respectively acquiring the up-down jumping frequency and the left-right jumping frequency of the metal belt ring based on the up-down jumping amount and the left-right jumping amount of the metal belt ring;

3) calculating the oil pressure adjustment quantity of a driving wheel cylinder and a driven wheel cylinder of the continuously variable transmission through the left-right jumping adjustment quantity and the left-right jumping frequency of the metal belt loop, and sending the oil pressure adjustment quantity to a TCU (transmission control unit) controller to adjust the oil pressure of the driving wheel cylinder and the driven wheel cylinder; and calculating the rotating speed adjustment quantity of the driving motor through the up-down jumping adjustment quantity and the up-down jumping frequency of the metal belt ring, and sending the rotating speed adjustment quantity to the motor controller to adjust the rotating speed of the motor.

3. The method for controlling the failure of the belt loop of the continuously variable transmission as claimed in claim 2, wherein in the step 1), the calculation formulas of the left and right runout adjustment amount Δ x and the up and down runout adjustment amount Δ y of the belt loop are as follows:

wherein x and y are respectively the detection value of the left and right jumping amount and the detection value of the up and down jumping amount of the metal belt ring; x is the number of₀、y₀Respectively a left-right jumping amount threshold value and a top-bottom jumping amount threshold value of the metal belt ring.

4. The method for controlling failure of a belt loop of a continuously variable transmission in accordance with claim 2, wherein in the step 2), the left-right runout frequency f of the belt loop_xThe calculation formula of (a) is as follows:

wherein x is_n、x_n-1The left and right jumping amounts at n moments and n-1 moments respectively; x is the number of_m、x_m-1The left and right jumping amounts of the metal belt ring at m time and m-1 time respectively; a is₁、b₁Respectively representing the n moment and the m moment of the left and right jumping quantities, and timing by taking the starting time of the motor as an initial moment;

up-down runout frequency f of metal belt loop_yIs calculated byThe formula is as follows:

wherein, y_n、y_n-1The up-down jumping quantity at n time and n-1 time respectively; y is_m、y_m-1The upper and lower jumping quantities of the metal belt ring at m time and m-1 time respectively; a is₂、b₂The n time and the m time respectively represent the up-down jumping amount, and the starting time of the motor is used as the initial time for timing.

5. The method for controlling a failure in a belt loop of a continuously variable transmission belt according to claim 4, wherein in the step 3), the amount of hydraulic pressure adjustment Δ P of the driven wheel cylinder of the continuously variable transmission_cThe calculation formula of (a) is as follows:

wherein, a₃Is a constant; f. of_T0The sampling frequency of the TCU controller is represented and is constant; c (k) is the kth sampling time of the TCU controller, and k is a sampling sequence number; oil pressure adjustment amount Δ P of driven wheel cylinder of continuously variable transmission_mIs calculated as Δ P_m＝a₄·ΔP_cWherein a is₄Is a constant.

6. The method for controlling the failure of the belt loop of the continuously variable transmission metal belt according to claim 4, wherein in the step 3), the calculation formula of the rotation speed adjustment amount Δ n of the driving motor is as follows:

wherein, a₅Is a constant; f. of_M0The sampling frequency of the motor controller is represented and is constant; and c (k) is the kth sampling time of the motor controller, and k is a sampling sequence number.

Technical Field

The invention relates to a device and a method for controlling failure of a metal belt ring of a continuously variable transmission.

Background

China has made a great progress in the electric automobile technology through scientific and technological passing, and the overall technology level approaches the international advanced level. However, in the technical aspect of a transmission system, the electric automobile adopts a single-speed-ratio speed reducer, and the problems of large motor size and energy consumption, high motor temperature in a low-efficiency stage, low battery life, insufficient acceleration performance in a medium-high speed stage and the like exist. In the long term, it will be a trend of developing an electric vehicle without a multi-speed transmission for an electric machine. The multi-speed transmissions currently in use mainly include the following three types: hydraulic Automatic Transmissions (AT), Automated Mechanical Transmissions (AMT) and metal belt Continuously Variable Transmissions (CVT). Compared with other multi-gear transmissions, the metal belt type Continuously Variable Transmission (CVT) has the advantages of light weight, small size, simple structure, high economy, strong driving smoothness and the like, and becomes an excellent transmission on small and medium-sized automobiles. However, the metal belt type Continuously Variable Transmission (CVT) belongs to friction transmission and has large power loss. Research results show that the power loss of the metal belt type continuously variable transmission on the traditional automobile accounts for 33.4 percent of the total power of the engine. If the electric automobile is provided with the metal belt type Continuously Variable Transmission (CVT), the transmission system does not need a torque converter and fewer gear pairs, and the conventional mechanical pump can be replaced by the electric pump by the 300-plus-400V high-voltage power on the electric automobile, so that the problems of large overflow and throttling power loss in a hydraulic system are solved. The configuration mode is expected to reduce the power loss of a metal belt type Continuously Variable Transmission (CVT) by about 20 percent, not only avoids the existing defects of the CVT, but also retains the incomparable advantages of the CVT, and can bring the performance of the CVT into full play. As described above, a metal belt type Continuously Variable Transmission (CVT) is an ideal transmission for electric vehicles.

Under the high rotational speed operating condition of electric automobile, especially when exceeding 8000 revolutions, can produce fine motion friction and flutter effect when CVT "band pulley-metal piece-band ring" discontinuous body contacts, the band ring is about making a round trip and is beaten from top to bottom between the steel sheet saddle face promptly, and the band ring is very easily worn and torn and is taken place fatigue crack, finally leads to the band ring to take place to split to arouse CVT transmission failure, CVT life-span will descend by a wide margin.

Disclosure of Invention

In order to solve the technical problems, the invention provides a device and a method for controlling the failure of a metal belt ring of a continuously variable transmission, which have the advantages of simple structure and low cost, can reduce the risk of the breakage failure of the metal belt ring of the continuously variable transmission under the condition of high rotating speed, and ensure that the continuously variable transmission can be applied to an electric automobile.

The technical scheme adopted by the invention is as follows: a failure control device for a metal belt ring of a continuously variable transmission comprises a camera, the continuously variable transmission, a control device and a failure calculation unit; the camera is arranged between the driving wheel shaft and the driven wheel shaft of the stepless speed changer, the axis of a lens of the camera is parallel to the axis of the driving wheel shaft, and the lens is over against the belt ring of the metal belt of the stepless speed changer; the control device comprises a TCU controller, a motor controller and a failure calculation unit, wherein the motor controller is connected with the failure calculation unit, the failure calculation unit is connected with the TCU controller, and the TCU controller is connected with a stepless speed change hydraulic system; the failure calculation unit is connected with the camera and receives the belt ring jumping signal value captured by the camera.

A method for controlling the failure of a metal belt ring of a continuously variable transmission by using the device for controlling the failure of the metal belt ring of the continuously variable transmission comprises the following steps:

1) detecting the up-down jumping amount and the left-right jumping amount of the metal belt through a camera, and calculating the up-down jumping adjustment amount and the left-right jumping adjustment amount of the metal belt ring by a failure calculation unit according to the up-down jumping amount threshold value and the left-right jumping amount threshold value of the metal belt ring;

2) respectively acquiring the up-down jumping frequency and the left-right jumping frequency of the metal belt ring based on the up-down jumping amount and the left-right jumping amount of the metal belt ring;

3) calculating oil pressure adjustment amounts of a driving wheel cylinder and a driven wheel cylinder of the continuously variable transmission through left-right jumping adjustment amounts and left-right jumping frequencies of a belt ring of the metal belt, and sending the oil pressure adjustment amounts to a TCU (transmission control unit) controller to adjust oil pressures of the driving wheel cylinder and the driven wheel cylinder; and calculating the rotating speed adjustment quantity of the driving motor through the up-down jumping adjustment quantity and the up-down jumping frequency of the metal belt ring, and sending the rotating speed adjustment quantity to the motor controller to adjust the rotating speed of the motor.

In the method for controlling the failure of the metal belt loop of the continuously variable transmission, in the step 1), the calculation formulas of the left and right runout adjustment amount Δ x and the up and down runout adjustment amount Δ y of the metal belt loop are as follows:

wherein x and y are respectively the detection value of the left and right jumping amount of the metal belt loop and the detection value of the up and down jumping amount of the metal belt loop; x is the number of₀、y₀Respectively a left-right jumping quantity threshold value and a top-bottom jumping quantity threshold value of the metal belt ring.

In the method for controlling the failure of the belt loop of the continuously variable transmission, in the step 2), the left and right jumping frequency f of the belt loop_xThe calculation formula of (a) is as follows:

wherein x is_n、x_n-1The left and right jumping amounts at n moments and n-1 moments respectively; x is the number of_m、x_m-1The left and right jumping amounts of the metal belt ring at m time and m-1 time respectively; a is₁、b₁Respectively representing the n moment and the m moment of the left and right jumping quantities, and timing by taking the starting time of the motor as an initial moment;

up-down runout frequency f of metal belt loop_yThe calculation formula of (a) is as follows:

wherein, y_n、y_n-1The up-down jumping quantity at n time and n-1 time respectively; y is_m、y_m-1The upper and lower jumping quantities of the metal belt ring at m time and m-1 time respectively; a is₂、b₂The n time and the m time respectively represent the up-down jumping amount, and the starting time of the motor is used as the initial time for timing.

In the method for controlling failure of a belt loop of a continuously variable transmission metal belt, in the step 3), the hydraulic pressure adjustment amount Δ P of the driven wheel cylinder of the continuously variable transmission_cThe calculation formula of (a) is as follows:

wherein, a₃Is a constant; f. of_T0The sampling frequency of the TCU controller is represented and is constant; c (k) is the kth sampling time of the TCU controller, and k is the serial number of the sampling point; oil pressure adjustment amount Δ P of driven wheel cylinder of continuously variable transmission_mIs calculated as Δ P_m＝a₄·ΔP_cWherein a is₄Is a constant.

In the method for controlling the failure of the belt loop of the metal belt of the continuously variable transmission, in the step 3), a calculation formula of the rotation speed adjustment amount Δ n of the driving motor is as follows:

wherein, a₅Is a constant; f. of_M0The sampling frequency of the motor controller is represented and is constant; c (k) is the kth sampling time of the motor controller, and k is the serial number of a sampling point; .

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the oil pressure adjustment quantity and the motor rotation speed adjustment quantity of the stepless transmission are calculated through the left and right jumping adjustment quantity and the up and down jumping adjustment quantity of the belt ring of the metal belt, and the left and right jumping frequency and the up and down jumping frequency of the belt ring, so that the up and down jumping quantity and the left and right jumping quantity of the metal belt ring in actual service are reduced, and the micro-motion and flutter effects with serious failure behaviors are avoided; the failure control device for the metal belt ring of the continuously variable transmission has the advantages of simple structure and low cost, can reduce the risk of breakage failure of the metal belt ring of the continuously variable transmission under the condition of high rotating speed, and ensures that the continuously variable transmission can be applied to electric automobiles.

Drawings

FIG. 1 is a schematic structural diagram of a belt loop failure control device for a continuously variable transmission belt according to the present invention.

FIG. 2 is a schematic side view of a camera of the present invention detecting a metal belt loop.

FIG. 3 is a flow chart of a method of controlling a belt loop failure of a continuously variable transmission belt of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

As shown in FIG. 1, the failure control device for the belt loop of the continuously variable transmission metal belt comprises a camera 4, the continuously variable transmission, a control device and a failure calculation unit; the stepless transmission comprises a driving wheel moving conical disc 1, a driving wheel fixed conical disc 16, a driving wheel shaft 2, a driving wheel oil inlet 3, a metal belt 5, a driving wheel oil inlet pipe 6, a driven wheel oil inlet 7, a driven wheel fixed conical disc 8, a driven wheel moving conical disc 9, a driven wheel oil inlet pipe 10, a driven wheel shaft 17 and a hydraulic system 11, wherein the hydraulic system 11 is connected with the driving wheel oil inlet 3 and the driven wheel oil inlet 7 through the driving wheel oil inlet pipe 6 and the driven wheel oil inlet pipe 10 respectively. The driving motor 15 is connected with the driving wheel shaft 2, the driving wheel shaft 2 is fixedly connected with the driving wheel fixed conical disc 16, the driving wheel movable conical disc 1 can slide left and right on the driving wheel shaft 2, and the hydraulic cylinder is used for increasing and reducing pressure on the driving wheel movable conical disc. The driven wheel shaft 17 is fixedly connected with the driven wheel fixed conical disc 8, the driven wheel movable conical disc 9 can slide back and forth on the driven wheel shaft 17, and the metal belt 5 is clamped between the driving wheel movable conical disc 1 and the driving wheel fixed conical disc 16 and between the driven wheel fixed conical disc 8 and the driven wheel movable conical disc 9.

The control device comprises a TCU controller 12, a failure calculation unit 13 and a motor controller 14, wherein the motor controller 14 is connected with the failure calculation unit 13, the failure calculation unit 13 is connected with the TCU controller 12, and the TCU controller 12 is connected with a hydraulic system 11 with stepless speed change. The TCU controller 12 receives the pressure adjustment amount control command from the failure calculation unit 13, and then converts the corresponding control command into a PWM signal to be applied to the hydraulic system 11. The motor controller 14 receives the control command of the rotational speed adjustment amount from the failure calculation unit 13, and then converts the corresponding control command into a PWM signal to be applied to the driving motor. The camera 4 is arranged between the driving wheel shaft 2 and the driven wheel shaft 17 of the continuously variable transmission, the axis of a lens of the camera 4 is parallel to the axis of the driving wheel shaft 2, and the lens faces towards the metal belt of the continuously variable transmission; the failure calculation unit is connected with the camera and receives the belt loop jumping signal value captured by the camera.

As shown in fig. 2, the metal belt 5 consists of 9 belt loops 19 and several hundred metal sheets 18. Just for 4 belt loops 19, the camera is along the belt loop direction for X direction, and the direction perpendicular to the belt loop is the Y direction.

As shown in fig. 3, the control method of the metal belt failure control device for a continuously variable transmission of the present invention includes the steps of:

1) detecting the up-down jumping amount and the left-right jumping amount of a belt ring 19 of a metal belt 5 through a camera 4, and calculating a left-right jumping adjustment amount and a left-right jumping adjustment amount by a failure calculation unit according to the up-down jumping amount threshold value and the left-right jumping amount threshold value respectively;

the calculation formula of the left and right jumping adjustment quantity delta x and the up and down jumping adjustment quantity delta y of the metal belt ring is as follows:

in the formula, x and y are respectively a detection value of the left and right jumping amount and a detection value of the up and down jumping amount of the metal belt ring; x is the number of₀、y₀Respectively a left-right jumping amount threshold value and a top-bottom jumping amount threshold value of the metal belt ring.

2) Respectively acquiring the up-down and left-right jumping frequencies of the belt loop 19 based on the up-down jumping amount and the left-right jumping amount of the belt loop 19 of the metal belt 5;

left and right beat frequency f of belt loop 19_xThe calculation formula of (a) is as follows:

in the formula, x_n、x_n-1The left and right jumping amounts at n moments and n-1 moments respectively; x is the number of_m、x_m-1The left and right jumping amounts of the metal belt ring at m time and m-1 time respectively; a is₁、b₁The n time and the m time respectively represent the left and right jumping quantities, and the starting time of the motor is used as the initial time for timing.

Likewise, the up-down beat frequency f of the belt loop 19_yThe calculation formula of (a) is as follows:

in the formula, y_n、y_n-1The up-down jumping quantity at n time and n-1 time respectively; y is_m、y_m-1The upper and lower jumping quantities of the metal belt ring at m time and m-1 time respectively; a is₂、b₂The n time and the m time respectively represent the up-down jumping amount, and the starting time of the motor is used as the initial time for timing.

3) Calculating the oil pressure adjustment quantity of an oil inlet 3 of a driving wheel and an oil inlet 7 of a driven wheel of the continuously variable transmission through the left-right jumping adjustment quantity and the left-right jumping frequency of the metal belt ring, and sending the oil pressure adjustment quantity to a TCU (transmission control unit) controller 12;

oil pressure adjustment quantity delta P of driven wheel oil inlet 3 of continuously variable transmission_cThe calculation formula of (a) is as follows:

in the formula, a₃Is a constant; f. of_T0Represents the sampling frequency of the TCU controller 12, being constant; and c (k) is the kth sampling time of the TCU controller 12, and k is the sampling number. Oil pressure adjustment quantity delta P of driven wheel oil inlet 7 of continuously variable transmission_mIs calculated as Δ P_m＝a₄·ΔP_cWherein a is₄Is a constant.

4) The rotation speed adjustment amount of the drive motor 15 is calculated by the up-down runout adjustment amount and the up-down runout frequency of the metal belt loop, and sent to the motor controller 14.

The calculation formula of the rotation speed adjustment amount Δ n of the drive motor 15 is as follows:

in the formula, a₅Is a constant; f. of_M0Represents the sampling frequency of the motor controller 14, and is constant; and c (k) is the kth sampling time of the motor controller 14, and k is the sampling sequence number.