CN110094500B - CVT electronic control system and method - Google Patents
CVT electronic control system and method Download PDFInfo
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- CN110094500B CN110094500B CN201910339252.XA CN201910339252A CN110094500B CN 110094500 B CN110094500 B CN 110094500B CN 201910339252 A CN201910339252 A CN 201910339252A CN 110094500 B CN110094500 B CN 110094500B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/32—Electric motors actuators or related electrical control means therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3408—Locking or disabling mechanisms the locking mechanism being moved by the final actuating mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
- H02P7/04—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors by means of a H-bridge circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/32—Electric motors actuators or related electrical control means therefor
- F16H2061/326—Actuators for range selection, i.e. actuators for controlling the range selector or the manual range valve in the transmission
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention discloses a CVT electronic control system and a method, comprising a motor control circuit, a motor locking device, a power module, a speed ratio execution motor and a CAN communication network; the motor control circuit is a throttle opening sensor, and signals of gears are input to the singlechip through AD conversion; the engine brake signal is input to the singlechip through a switching value input signal, namely a switching signal; the engine rotating speed pulse signal is input to the singlechip motor locking circuit through the pulse measuring circuit and numerical value conversion to obtain a rotating speed, the rotating speed pulse signal is output to the speed ratio executing motor by the singlechip, and the singlechip outputs a switching value signal to the speed ratio executing motor locking relay; the single chip microcomputer MC9S12G48 calculates the rotating speed through a period method and a frequency method, the invention enables the actual transmission speed ratio to continuously approach the target speed ratio, realizes the balance of the output torque and the running resistance of the engine and exerts the optimal performance of the vehicle.
Description
Technical Field
The invention relates to a CVT gearbox in an automobile, in particular to electronic control in the CVT gearbox.
Background
The automotive industry has entered a maturity stage in modern automotive development over 100 years since its origin in europe, from steam engines to internal combustion engines. With the development of automobiles becoming faster and faster, people have higher requirements on automobiles, and the requirements on the comfort, safety and economy of the automobiles are higher, and the requirements on the driving performance and emission standards of the automobiles are reflected. Therefore, many innovative technologies are brought forward, and the automatic transmission technology is an important technology and is also the research of the automobile transmission system which is continuously researched and reformed by modern automobile researchers.
A continuously variable transmission is a transmission capable of continuously varying a speed ratio. The existing belt-driven continuously variable transmission mainly adopts a metal belt type and a metal chain type, and compared with the metal belt-driven continuously variable transmission, the metal belt-driven continuously variable transmission is more excellent in service life, working stability, transmission efficiency, transmission noise and the like. Compared with the traditional transmission which uses a metal belt type stepless transmission, the power of the engine can be fully utilized, the continuous and smooth power transmission of the automobile is realized, the impact is reduced, the service life of the transmission is prolonged, and the stepless transmission has a wider speed ratio change range, so that the engine can stably run in a rational working state under most conditions, the emission of harmful gas in the waste of the engine is reduced, and the pollution to the environment is reduced.
In a modern metal belt type CVT, a mechanical hydraulic control system and an electronic hydraulic control system are generally used, but the mechanical hydraulic control system cannot realize accurate control of the speed ratio, the working pressure of the hydraulic control system is high, energy loss of the hydraulic system is increased, the hydraulic control system needs an oil pump to provide continuous and stable pressure, and the oil pump continuously consumes energy. Therefore, the hydraulic control system has the defects of low working reliability, high energy consumption, high cost and the like. The project is a new electronic control system of the design of the all-electric control continuously variable transmission. Namely, a mechanical electronic control system which is replaced by an oil pump with high energy consumption, a hydraulic valve, a brush direct current motor with low energy consumption, a spiral spring, a gear worm mechanism and the like is removed. Compared with the traditional CVT control system, the mechanical electronic control system can realize the positioning of the movable disc through the self-locking of the screw lever and provide the clamping force required by transmission, so that the characteristic of independent consideration of the control of the clamping force is not needed, and the mechanical electronic control system has the advantages of low fuel consumption, low mass production cost of the control system, accurate control of the speed ratio and the like.
Disclosure of Invention
1. Objects of the invention
Aiming at the defects, the invention provides the pure mechanical electronic CVT electronic control system and the pure mechanical electronic CVT electronic control method which have the advantages of low energy consumption, accurate control, low cost and high integration level.
2. The technical scheme adopted by the invention for solving the technical problem is as follows:
the invention provides a CVT electronic control system, which comprises a motor control circuit, a motor locking device, a power module, a speed ratio execution motor and a CAN communication network, wherein the motor control circuit is connected with the motor locking device through a power supply module;
the motor control circuit is a throttle opening sensor, and signals of gears are input to the singlechip through AD conversion;
the engine brake signal is input to the singlechip through a switching value input signal, namely a switching signal;
the engine rotating speed pulse signal is converted into a rotating speed through a pulse measuring circuit and a numerical value and then is input into the singlechip;
the motor locking circuit is characterized in that the single chip microcomputer outputs a PWM signal to the speed ratio execution motor, and the single chip microcomputer outputs a switching value signal to the speed ratio execution motor locking relay; the single chip microcomputer is MC9S12G48, the rotating speed is calculated through a periodic method and a frequency method, and the rotating speed is calculated through the periodic method when the rotating speed is low; calculating the rotating speed by using a frequency method when the rotating speed is high; and calculating a target speed ratio, outputting the target speed ratio to a speed ratio executing motor, enabling the actual speed ratio to approach the target speed ratio continuously, and feeding back the actual speed ratio to the single chip microcomputer continuously for closed-loop control.
Further, the motor control circuit: the chip A3941 performs PWM high-side driving, PWML is directly connected with 5V to be high level, synchronous rectification is performed, an SR pin is connected with 5V to be high level, a PHASE pin is connected with an I/O port of a single chip microcomputer, and the rotation direction of the motor is changed by setting the high level and the low level through the I/O.
Furthermore, the CAN communication network includes a CAN chip TJA1050, so that the CANH and CANL terminals use a common mode inductor for filtering, and an anti-static diode is added.
Further, the motor control circuit controls the rotating speed to be: the single chip microcomputer is used for outputting PWM signals to drive an A3941 chip of the MOS transistor to carry out PWM high-side driving, the PWML and SR of the A3941 chip are connected with a power supply VCC to be set high, the rotating speed of the motor is directly controlled through PWMH, and meanwhile, synchronous rectification is started, so that the efficiency is improved; the H bridge is matched with A3941 to use, GS ends of four MOS tubes of the H bridge are connected with resistors in parallel, and DS ends of the four MOS tubes of the H bridge are connected with capacitors in parallel.
The invention discloses a CVT electronic control method, which is characterized in that the target speed ratio is output to a speed ratio executing motor, and the method comprises the following steps:
through single chip microcomputer PWM signal output, through MOS pipe driver chip A3941 and motor drive H bridge circuit drive velocity ratio actuating motor, real-time response changes the velocity ratio requirement, change velocity ratio actuating motor's rotational speed, corner, direction fast, change driving and driven pulley driving disk lateral position, and back conveyer belt position also changes because of the position change of driving and driven wheel dish, because the length of conveyer belt is the definite value, when the distance between driving disk and the fixed plate constantly changes, will make the working diameter of conveyer belt change, the velocity ratio consequently changes, reach constantly adjusting the velocity ratio to the target speed ratio.
Furthermore, the rotating speed measuring interface circuit is compared with a reference voltage through an input voltage comparator, when the input voltage is higher than the reference voltage, the output end outputs a high level, when the input voltage is lower than the reference voltage, the output end outputs a low level to generate a square wave, the rotating speed is calculated through the occurrence time of the rising edge and the falling edge of the square wave, and the rotating speed is calculated through a period method and a frequency method.
Furthermore, the continuously variable transmission locks the motor when the speed ratio executing motor does not work: the speed ratio executing motor is a brush direct current motor, and the motor is locked after two ends of the brush direct current motor are short-circuited; the circuit board has a four-pin relay at the motor both ends, and the I/O mouth control relay actuation of singlechip:
when the automobile is in an idling state, because the speed ratio execution motor of the continuously variable transmission is in a long-time non-working state, the relay is closed to short-circuit the speed ratio execution motor, and the speed ratio execution motor is locked;
when the automobile is in a working interval and the target speed ratio requirement is zero, the phase of the motor is changed between 1ms intervals to continuously realize forward and reverse rotation, the motor is ensured to be in a state of being incapable of being rotated all the time, and the motor locking is realized.
Furthermore, after the screw is started, the screw is reset; the screw is reset by using the speed ratio executing motor, and when the screw reaches the initial position, the speed ratio executing motor is blocked and cannot run; the singlechip monitors that the AD value is larger than the threshold value, namely the initial position is reached, and the reset operation is finished.
Furthermore, switching value signals are collected, 12V or 24V to 5V level conversion is carried out through a photoelectric isolator, and interference is prevented from being introduced; when the input is low level, the photoelectric isolator is cut off, and high level is output; when the input is high level, the photoelectric isolator is conducted, and the output is low level; through the IO port of the single chip microcomputer, the switching value signal is directly judged, and the signal level logic is inverted, namely the signal is a correct logic signal.
Further, the sensor input signal is first order lag filtered by first order lag filtering: yn ═ x (1-a) Xn + a Yn-1Wherein X isnIs the nth sample; y isn-1A secondary filter output value; y isnIs the output value of the nth order filter; alpha is a smoothing coefficient and alpha is a smoothing coefficient,
wherein T is0Is a filtering link time constant; t is the sampling period.
3. The invention has the beneficial effects
(1) Aiming at the CVT system controlled by pure machinery and electronics, the invention can effectively reduce the cost and the energy consumption and has the advantages of accurate control of the speed ratio and the like.
(2) The invention can realize the positioning of the movable disc by the self-locking of the screw lever and provide the clamping force required by transmission, thereby having the characteristic of not needing to consider the control of the clamping force independently.
(3) The invention has two locking modes, can effectively lock the speed ratio executing motor, and prevents the misoperation of the speed ratio executing motor caused by external reasons such as interference or vehicle bump.
(4) The control method of the invention converts the signals into numerical values through digital-to-analog conversion by receiving the signals of each sensor, obtains target values through specific functional relations together with the switching signals, and gradually changes the target speed ratio according to the fuzzy PID. The actual speed ratio value is enabled to be continuously close to the target speed ratio value, and the actual speed ratio value is continuously fed back to the controller, so that closed-loop control is formed.
(5) The speed ratio executing motor fault alarm system has a fault alarm function, when the speed ratio executing motor is in fault or blocked in movement, the controller CAN acquire motor fault information in real time and send a message to the upper computer through CAN communication in time, so that a driver CAN acquire the fault information in time and make overhaul judgment, the safety is improved, and after-sales personnel maintenance is facilitated.
Description of the drawings:
fig. 1 is a system schematic framework diagram of the present invention.
Fig. 2 is a schematic diagram of the principle of converting a pulse signal into a shaped signal according to the present invention.
FIG. 3 is a flow chart of the system algorithm of the present invention.
Fig. 4 is a one-chip microcomputer minimum system of the present invention.
Fig. 5 is a motor control module of the present invention.
Detailed Description
Examples
As shown in fig. 1, the present invention performs digital-to-analog conversion using the input throttle switch signal and the analog signal of the shift position signal; the brake signal is a switch signal and is converted by a switch signal circuit; the engine speed signal is a pulse signal and is input into the single chip microcomputer, conversion is needed through a pulse measuring circuit, numerical value conversion is conducted through a periodic method at low speed and a frequency method at high speed, and a target speed ratio is calculated through an algorithm according to various conversion signals and switching signals after the engine speed signal is input into the single chip microcomputer. And then the target speed ratio is output to a speed ratio executing motor, so that the actual speed ratio continuously approaches to the target speed ratio, and the actual speed ratio is continuously fed back to the singlechip to carry out closed-loop control. The balance between the output torque of the engine and the running resistance is realized, so that the engine can be always maintained in the optimal working area, and the optimal performance of the vehicle is exerted.
The CVT electronic control system is powered by an automobile storage battery, reverse connection prevention, filtering and transient high-energy impact prevention are achieved through a diode, an inductor and a TVS tube, a filtered power supply utilizes a TLE4275 chip to linearly stabilize the voltage of a 12V or 24V battery to 5V, and power is supplied to all components in the system. The motor part is directly powered by a storage battery, and a stable power supply is input through a power supply filtering module. The power supply current of the motor part is overlarge, and the inductance part uses the large inductance current of the patch flat copper wire to filter.
As shown in fig. 2, the speed ratio executing motor of the CVT electronic control system has two modes of locking functions, the first mode is a function which is played when the automobile is idling, when the automobile is in an idling state, a high level instruction is sent out by an I/O port of a single chip microcomputer, and a relay used is 5V to control attraction, so that two ends of the speed ratio executing motor are directly short-circuited, and one characteristic of a direct current brush motor is that when two ends of the direct current brush motor are short-circuited, the motor can be automatically locked and can rotate only by a certain large torque, namely, a certain locking function is played. However, the relay has a relatively long period time between the closing and the opening, so the locking function of the mode has slow response, and the speed ratio executing motor locking is generally only performed when the speed ratio executing motor of the gearbox is not operated. The second locking mode is that the duty ratio is in a small state through PWM output, the phase of the PWM is continuously changed within a period of 10ms, so that the motor completes the operation of positive and negative rotation, and the motor is always in a locking state because the period is short. This situation always outputs a signal to the motor through PWM, and thus the energy loss is large. But its responsiveness is high. The gear box is suitable for being used in the working clearance of the speed ratio execution motor of the gear box. The logic in the program is that when the PWM signal of the speed ratio executing motor is not output, namely logic 0, the singlechip outputs a signal for changing the PWM phase. When the single chip receives an external sensor signal and needs to change speed, a logic 1 is output at the moment, and under the logic, the state of a logic 0 is immediately skipped, and a PWM signal of a speed ratio execution motor is output to change the speed ratio of the CVT electronic control system.
Before the CVT electronic control system works, the screw rod controlled by the speed ratio executing motor is always ensured to be at an initial position, namely an initial speed ratio value. Every time the automobile is in the stage from high-speed braking to parking, the speed ratio of the gearbox is changed from minimum to maximum, the position of the screw rod is also moved from the left end to the right end, and in order to prevent the screw rod from not returning to the initial position, the PWM still outputs a PWM signal after the automobile is stopped, so that the screw rod can completely return to the initial point. The electronic control module in the electronic control system is provided with a device for sampling the current of the motor circuit by a sampling resistor and sending the current into an operational amplifier, the current sampled by the resistor is amplified by the operational amplifier and then is input into a single chip microcomputer, the current is converted into a numerical value by an AD (analog-to-digital) module of the single chip microcomputer, when the numerical value is larger than a certain threshold value, the motor is blocked in operation, and in the first case, a screw rod returns to the initial position, and a speed ratio execution motor cannot rotate any more. At which point the system ends. The second condition is a motor failure or a mechanical failure, at which time an alarm signal will occur, requiring disassembly for repair.
The signal acquisition circuit of the CVT electronic control system comprises an analog signal acquisition circuit, a switching signal acquisition circuit and a pulse signal acquisition circuit. The analog signal carries out partial pressure of a voltage division circuit according to the voltage range of the signal and then is directly connected to the single chip microcomputer, and the AD module of the single chip microcomputer is used for driving the AD module at the bottom layer to complete AD conversion. The collection of switching signal utilizes photoelectric isolator, and photoelectric isolator interference killing feature is outstanding, and the switching signal of input on the car is 12V or 24V generally, converts 12V or 24V high level into 5V through photoelectric isolator and inputs the singlechip. The pulse signal acquisition is to pass through the pulse acquisition circuit, passes through the voltage comparator, and voltage comparator one end connects reference voltage, and when the acquisition voltage is higher than reference voltage, the voltage comparator output high level, when the acquisition voltage is lower than reference voltage, the voltage comparator output low level. This shapes the sensor signal as shown in fig. 2. The specific rotating speed can be calculated by a frequency method and a periodic method through the occurrence time of the rising edge and the falling edge of the shaping signal. The frequency method and the periodic method have respective characteristics, the frequency method is suitable for high rotating speed, and the periodic method is suitable for low rotating speed.
In the communication part of the CVT electronic control system, a vehicle-mounted network on an automobile generally uses CAN communication, a CAN signal of the system adopts 29-bit extended frames, the baud rate is set to be 250K, a CAN communication chip used by the electronic control system is TJA1050, the CAN signal is a differential mode signal, and in order to eliminate most common mode signals and stable signals, common mode inductors are connected to two output ends of the CAN. And to prevent static electricity, an anti-static diode is added across the output.
As shown in fig. 5, in the motor executing part of the CVT electronic control system, the motor executing part of the CVT electronic control system is integrated into an H-bridge through a MOS transistor, so as to realize the forward and reverse rotation functions of the motor, and in order to realize the fast response of the motor and the stable conduction of the MOS transistor, a MOS transistor driving chip a3941 is used to control the switching of the MOS transistor and the phase of the H-bridge. The speed of the MOS tube switch and the phase of the H bridge can be conveniently controlled through the output of the PWM signal, namely the rotating speed, the steering and the turning angle of the motor are controlled. In this system, a high-side driving mode is used, i.e., the PWML of the chip is switched to a high level, and the PWM output signal is connected to the PWMH pin. And simultaneously, synchronous rectification is started, and an SR pin is connected into a high level. The rotation direction of the motor can be controlled by changing the level of the PHASE pin of the chip. In order to stabilize the operation of the MOS tube, a resistor is connected in parallel at the GS end of the MOS tube, and a capacitor is connected in parallel at the DS end of the MOS tube.
The control system mainly adopts a 4M passive crystal oscillator to provide a system clock, and is connected with a reset end and a burning data end of a singlechip at a burning port part. Since the burning port is easy to generate electrostatic phenomenon, an electrostatic diode is added to the burning port,
the software part of the CVT electronic control system is divided into a bottom layer module drive and an application layer module. The bottom module driver is mainly used for initializing and configuring the system through an MC9S12G48 chip manual, configuring the bus frequency of the single chip microcomputer to be 24M, and setting the output port and the input port of the real-time interrupt and IO port. An ADC module, a CAN module and a PWM module are configured in the whole control system. After the bottom layer configuration is completed, a 1ms task function is called to write the main function, and the functional relation between the speed ratio and the variable can be obtained through the input variables through experiments and simulation. And gradually changing the target speed ratio to a fixed value according to the fuzzy PID on the basis of the obtained speed ratio function value and the actual speed ratio value.
In the software part of the CVT electronic control system, the signal input of a sensor needs to be subjected to software filtering, signals with overlarge offset are removed, system signal filtering is carried out through first-order lag filtering, the system signal filtering is suitable for signals with slow change, and a first-order lag filtering algorithm is that Yn is (1-alpha) Xn + alpha Yn-1Wherein X isnIs the nth sample; y isn-1A secondary filter output value; y isnIs the output value of the nth order filter; alpha is a smoothing coefficient and alpha is a smoothing coefficient,
wherein T is0Is a filtering link time constant; t is the sampling period.
Claims (7)
1. A CVT electronic control system characterized by: the device comprises a motor control circuit, a motor locking device, a power module, a speed ratio execution motor and a CAN communication network;
the motor control circuit is a throttle opening sensor, and signals of gears are input to the singlechip through AD conversion;
the engine brake signal is input to the singlechip through a switching value input signal, namely a switching signal;
the engine rotating speed pulse signal is converted into a rotating speed through a pulse measuring circuit and a numerical value and then is input into the singlechip;
the motor locking circuit is characterized in that the single chip microcomputer outputs a PWM signal to the speed ratio execution motor, and the single chip microcomputer outputs a switching value signal to the speed ratio execution motor locking relay; the single chip microcomputer MC9S12G48 calculates the rotating speed according to a periodic method and a frequency method, and when the rotating speed is low, the rotating speed is calculated by using the periodic method; calculating the rotating speed by using a frequency method when the rotating speed is high; calculating a target speed ratio, outputting the target speed ratio to a speed ratio executing motor to enable an actual speed ratio to approach the target speed ratio continuously, and feeding back the actual speed ratio to a single chip microcomputer continuously to perform closed-loop control;
outputting the target speed ratio to a speed ratio executing motor specifically comprises the following steps:
through the PWM signal output of a singlechip, a speed ratio executing motor is driven by an MOS tube driving chip A3941 and a motor driving H-bridge circuit, the requirement of changing the speed ratio is responded in real time, the rotating speed, the rotating angle and the direction of the speed ratio executing motor are changed rapidly, the transverse position of a driving pulley and a driven pulley disc is changed, the position of a rear conveyer belt is also changed due to the change of the position of the driving pulley disc and the driven pulley disc, the working diameter of the conveyer belt is changed when the distance between the driving disc and a fixed disc is changed continuously because the length of the conveyer belt is a fixed value, the speed ratio is changed accordingly, and the ratio of continuously adjusting the speed ratio to a target speed ratio is achieved;
the control rotating speed of the motor control circuit is as follows: the single chip microcomputer is used for outputting PWM signals to drive an A3941 chip of the MOS transistor to carry out PWM high-side driving, the PWML and SR of the A3941 chip are connected with a power supply VCC to be set high, the rotating speed of the motor is directly controlled through PWMH, and meanwhile, synchronous rectification is started, so that the efficiency is improved; the H bridge is matched with A3941 for use, GS ends of four MOS tubes of the H bridge are connected with resistors in parallel, and DS ends are connected with capacitors in parallel;
locking the motor when the speed ratio executing motor of the stepless speed changer does not work: the speed ratio executing motor is a brush direct current motor, and the motor is locked after two ends of the brush direct current motor are short-circuited; the circuit board has a four-pin relay at the motor both ends, and the I/O mouth control relay actuation of singlechip:
when the automobile is in an idling state, because the speed ratio execution motor of the continuously variable transmission is in a long-time non-working state, the relay is closed to short-circuit the speed ratio execution motor, and the speed ratio execution motor is locked;
when the automobile is in a working interval and the target speed ratio requirement is zero, the phase of the motor is changed between 1ms intervals to continuously realize forward and reverse rotation, the motor is ensured to be in a state of being incapable of being rotated all the time, and the motor locking is realized.
2. The CVT electronic control system according to claim 1, wherein the motor control circuit: the chip A3941 performs PWM high-side driving, PWML is directly connected with 5V to be high level, synchronous rectification is performed, an SR pin is connected with 5V to be high level, a PHASE pin is connected with an I/O port of a single chip microcomputer, and the rotation direction of the motor is changed by setting the high level and the low level through the I/O.
3. The CVT electronic control system according to claim 1, wherein: the CAN communication network comprises a CAN chip TJA1050, common-mode inductors are used at CANH ends and CANL ends for filtering, and an anti-static diode is added.
4. The CVT electronic control system according to claim 1, wherein the rotation speed measurement interface circuit outputs a high level at the output terminal when the input voltage is higher than the reference voltage by comparing the input voltage with the reference voltage, outputs a low level when the input voltage is lower than the reference voltage, generates a square wave, calculates the rotation speed by the occurrence time of the rising edge and the falling edge of the square wave, and calculates the rotation speed by a cycle method and a frequency method.
5. The CVT electronic control system according to claim 2, wherein: after starting, resetting the screw rod; the screw is reset by using the speed ratio executing motor, and when the screw reaches the initial position, the speed ratio executing motor is blocked and cannot run; the singlechip monitors that the AD value is larger than the threshold value, namely the initial position is reached, and the reset operation is finished.
6. A CVT electronic control system according to claim 3, characterized in that: collecting switching value signals, carrying out 12V or 24V to 5V level conversion through a photoelectric isolator, and preventing interference from being introduced; when the input is low level, the photoelectric isolator is cut off, and high level is output; when the input is high level, the photoelectric isolator is conducted, and the output is low level; through the I/O port of the singlechip, the switching value signal is directly judged, and the signal level logic is inverted, namely the signal is a correct logic signal.
7. An electronic CVT control system as in claim 1 wherein the sensor input signal is filtered through a first order lag filterThe wave is first order lag filtered: yn ═ x (1-a) Xn + a Yn-1Wherein X isnIs the nth sample; y isn-1A secondary filter output value; y isnIs the output value of the nth order filter; alpha is a smoothing coefficient and alpha is a smoothing coefficient,
wherein T is0Is a filtering link time constant; t is the sampling period.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1182711A (en) * | 1997-09-13 | 1999-03-26 | Honda Motor Co Ltd | Method for shift control of electromotive transmission |
| CN1918406A (en) * | 2004-02-18 | 2007-02-21 | 盖茨公司 | Transmission and constant speed accessory drive |
| CN101270806A (en) * | 2007-03-20 | 2008-09-24 | 雅马哈发动机株式会社 | Transmission, controller and method of controlling transmission, power unit having the same, vehicle |
| CN101285523A (en) * | 2008-05-13 | 2008-10-15 | 南京汽车集团有限公司 | Electric control system for stepless speed transmission for automobile |
| CN102447436A (en) * | 2010-10-01 | 2012-05-09 | 中山大洋电机股份有限公司 | DC brushed motor self-locking control method and self-locking circuit thereof |
| CN104358851A (en) * | 2014-11-11 | 2015-02-18 | 江苏理工学院 | Vehicle electrical governing stepless speed change system and speed ratio stepless regulation device thereof |
| CN206708322U (en) * | 2017-03-16 | 2017-12-05 | 重庆高金实业有限公司 | Automobile electrically-controlled stepless speed variator system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101516706B (en) * | 2006-09-12 | 2013-01-23 | 丰田自动车株式会社 | Driving force control device for vehicle |
| US8684886B2 (en) * | 2010-05-13 | 2014-04-01 | Cvtech Inc. | Transmission control system and method thereof |
| JP6256378B2 (en) * | 2015-02-20 | 2018-01-10 | トヨタ自動車株式会社 | Control device for automatic transmission for vehicle |
-
2019
- 2019-04-25 CN CN201910339252.XA patent/CN110094500B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1182711A (en) * | 1997-09-13 | 1999-03-26 | Honda Motor Co Ltd | Method for shift control of electromotive transmission |
| CN1918406A (en) * | 2004-02-18 | 2007-02-21 | 盖茨公司 | Transmission and constant speed accessory drive |
| CN101270806A (en) * | 2007-03-20 | 2008-09-24 | 雅马哈发动机株式会社 | Transmission, controller and method of controlling transmission, power unit having the same, vehicle |
| CN101285523A (en) * | 2008-05-13 | 2008-10-15 | 南京汽车集团有限公司 | Electric control system for stepless speed transmission for automobile |
| CN102447436A (en) * | 2010-10-01 | 2012-05-09 | 中山大洋电机股份有限公司 | DC brushed motor self-locking control method and self-locking circuit thereof |
| CN104358851A (en) * | 2014-11-11 | 2015-02-18 | 江苏理工学院 | Vehicle electrical governing stepless speed change system and speed ratio stepless regulation device thereof |
| CN206708322U (en) * | 2017-03-16 | 2017-12-05 | 重庆高金实业有限公司 | Automobile electrically-controlled stepless speed variator system |
Non-Patent Citations (2)
| Title |
|---|
| 基于PSO优化Fuzzy-PID的全电调节无级变速器速比控制研究;张兰春;等;《机械传动》;20161215;全文 * |
| 智能小车的动力源;嵌入之梦;《电子制作》;20111201;第15-30页 * |
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