WO2020062499A1 - 一种针对电子节气门系统的非线性抗干扰控制方法及装置 - Google Patents
一种针对电子节气门系统的非线性抗干扰控制方法及装置 Download PDFInfo
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- WO2020062499A1 WO2020062499A1 PCT/CN2018/116293 CN2018116293W WO2020062499A1 WO 2020062499 A1 WO2020062499 A1 WO 2020062499A1 CN 2018116293 W CN2018116293 W CN 2018116293W WO 2020062499 A1 WO2020062499 A1 WO 2020062499A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
- G05B13/045—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance using a perturbation signal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/106—Detection of demand or actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/047—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators the criterion being a time optimal performance criterion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/1415—Controller structures or design using a state feedback or a state space representation
- F02D2041/1416—Observer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/143—Controller structures or design the control loop including a non-linear model or compensator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1065—Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
Definitions
- the invention relates to an electronic throttle system control technology, and belongs to the technical field of vehicle engine internal combustion system control technology.
- the throttle valve body In the traditional throttle system, the throttle valve body is directly connected to the accelerator pedal through a coil, and its opening degree is only related to the displacement of the pedal.
- the pure mechanical structure makes its control method relatively simple and belongs to direct control.
- the control mode In the electronic throttle system, the control mode is indirect control, and the electronic control unit receives the displacement information of the pedal to control the opening degree of the electronic throttle valve. Therefore, the electronic throttle is widely used in the engine internal combustion control system, and is regarded as the "throat" in the vehicle engine internal combustion system. By controlling the amount of intake air under different operating conditions, the electronic throttle can control and adjust the engine air-fuel ratio. In the actual process, it is also necessary to consider the engine operating conditions, engine speed, engine torque, and various environmental factors. influences.
- the electronic throttle system 100 studied by the present invention is different from the traditional throttle valve, and its operating principle can be specifically described as follows:
- the pedal position sensor 107 can detect The current pedal position signal, and the pedal displacement is transmitted to the electronic control unit 102, and the corresponding valve expected opening degree is obtained by calculating the expected air-fuel ratio.
- the electric control unit drives the DC motor 103 by a pulse width modulation (PWM) method to obtain an initial rotational torque. Since the reduction gear set 105 can realize torque transmission between the DC motor bearing 209 and the electronic throttle valve shaft 215, the valve opening of the electronic throttle valve 104 can be controlled by adjusting the torque of the DC motor 103.
- PWM pulse width modulation
- valve angle sensor can measure the valve opening of the electronic throttle valve 104, and the return spring pair 106a, 106b can control the valve movement of the electronic throttle valve 104 and return it to the default position, and stabilize it in the event of power loss Within a safe area.
- the electronic throttle system needs to have the characteristics of low pollutant discharge capacity and high working condition adaptability, so its control performance also needs to meet the following requirements: fast response, no overshoot, high steady-state accuracy, convenient engineering implementation, etc. Wait.
- electronic throttle systems are often affected by multi-source interference, uncertainty, and non-linearity caused by factors such as engine shake, high temperature, and increased carbon emissions.
- multi-source interference includes transmission friction, spring return torque, gear backlash, and external interference caused by intake air flow, production differences, and usage time; the uncertainty is mainly the engine operating conditions, altitude, temperature, and humidity
- the parameter uncertainty of system components caused by factors such as changes in air pressure and air pressure; unknown non-linear quantities are mainly caused by the above factors (such as transmission friction, spring return torque, gear backlash, etc.), and will cause the performance of the entire system Adverse effects.
- the present invention discloses a non-linear anti-interference control method and device for an electronic throttle system, which achieves the goal of continuous limited time anti-interference control, realizes fast and accurate tracking of the expected opening degree of the electronic throttle valve, and Accurate compensation suppression for multiple types of interference.
- the present invention provides the following technical solutions:
- a non-linear anti-interference control device for an electronic throttle system includes a control sub-device and an observation sub-device.
- a design method of a non-linear anti-interference control device for an electronic throttle system includes the following steps:
- Step 1 Analyze the working principle of the electronic throttle system, establish the system mathematical model and the control model separately, and introduce the idea of lumped disturbance for subsequent design;
- Step 2 On the basis of the system control model established in Step 1, design observation sub-devices and design finite-time observers to obtain the system state quantities and aggregate disturbance estimates in a limited time;
- Step 3 Based on the observation sub-device designed in step 2, design the control sub-device, design the continuous terminal sliding mode finite time controller, and combine a feed-forward compensation and output feedback control method to design a nonlinear anti-interference control method and device. .
- the present invention has the following advantages and beneficial effects:
- the invention realizes limited time control of the desired opening degree of the electronic throttle valve, thereby effectively improving the dynamic and static performance and anti-interference performance of the system.
- the invention considers many factors that have a significant impact on the performance of the electronic throttle system in the model, and eliminates the adverse effects of the friction torque and other factors on the controlled system through effective anti-interference means.
- the invention realizes accurate estimation of lumped interference and system state variables in a limited time.
- the invention combines a continuous terminal sliding mode control method and an output feedback control method, and effectively suppresses the multi-source interference, uncertainty and non-linear adverse effects in the electronic throttle system, so that the system is in a disturbed condition.
- accurate tracking control of the opening degree of the electronic throttle valve is realized, while reducing the hardware cost of the system, improving the system's dynamic characteristics, steady state characteristics and anti-interference ability.
- FIG. 1 is a schematic structural diagram of an electronic throttle valve according to the present invention.
- FIG. 2 is a schematic diagram of components of an electronic throttle valve according to the present invention.
- FIG. 3 is a working flowchart of a control sub-device of an electronic throttle valve according to the present invention.
- FIG. 4 is a working flowchart of the observation sub-device of the electronic throttle valve according to the present invention.
- FIG. 5 is a control block diagram of the electronic throttle valve of the present invention.
- the electronic throttle system 100 in this embodiment includes the following parts: an accelerator pedal 101; a pedal position sensor 107 for detecting displacement information of the accelerator pedal; and an electronic throttle 104 for using a desired pedal position Provide an appropriate air-fuel mixture ratio; a valve angle sensor 108 is used to detect the real-time opening of the electronic throttle valve 104; a DC motor 103 is used to provide the initial rotational torque for the electronic throttle valve 104; a reduction gear set 105 is used To achieve torque transmission from the DC motor 103 to the electronic throttle valve 104; the electronic control unit 102 is used to provide control signals to achieve effective control of the electronic throttle system 100; the return spring pair 106a, 106b is used to control the electronic The movement of the throttle valve 104 is still stable in a safe area in the case of power loss.
- the valve of the electronic throttle valve 104 has a rotating structure, and a default state thereof is fully open.
- the electronic control unit 102 can determine an appropriate air-fuel mixture ratio according to the desired pedal position, and output a control voltage based on the PWM technology to drive the DC motor 103 to generate a rotating torque.
- the DC motor 103 is an actuator of the entire system and provides an initial rotational torque for the electronic throttle valve 104.
- the DC motor 103 is connected to the damper shaft of the throttle valve through a reduction gear set, and its rotation torque is determined by the desired torque provided by the electronic control unit 102.
- the inductance voltage of the DC motor 103 is the PWM equivalent voltage output by the electric control unit 102.
- the reduction gear set 105 includes a motor gear 105a, a medium speed gear 105b, and a sector gear 105c.
- the return spring pairs 106 a and 106 b are installed in a rotary type, so there is an initial torque, and the spring torque changes with the opening degree of the electronic throttle valve 104.
- the basic working principle of the electronic throttle system 100 is as follows: When the driver depresses the accelerator pedal 101, the pedal position sensor 107 will detect the current pedal position signal and transmit the pedal displacement to the electronic control unit 102. By calculating the expected air-fuel ratio, the corresponding valve opening is obtained. At the same time, the electric control unit 102 drives the DC motor 103 through the PWM method to obtain the initial torque, and then drives the valve opening of the electronic throttle valve 104 to the desired opening degree through the transmission of the reduction gear set 105.
- a method and device are designed for controlling and observing the electronic throttle system 100 in this embodiment, where the device includes a control sub-device 300 And the observation sub-device 400 is a synthesis of the working steps of the device.
- the working steps of the control sub-device 300 designed in this embodiment are: (1) Operating condition parameter acquisition module 301, which obtains the operating condition parameters of the electronic throttle system 100 through sensors, measuring instruments and other means. (Usually including the actual valve opening of the electronic throttle valve 104, the fuel efficiency of the engine, external loads, weather and environmental factors, etc.); (2) a system mathematical model 302, by analyzing the working principle of the electronic throttle valve, establishing its mathematical model to Characterize the system characteristics of the electronic throttle system 100, where the system mathematical model 302 includes the following parameters: the shaft angle and angular velocity of the DC motor 103, the valve opening and angular velocity of the electronic throttle valve 104, the total impedance of the armature circuit, the armature current and Inductance, input and output torque of reduction gear, interference torque caused by intake air flow, return spring torque, load torque and friction torque.
- Operating condition parameter acquisition module 301 which obtains the operating condition parameters of the electronic throttle system 100 through sensors, measuring instruments and other means. (Usually including the actual valve opening of the electronic throttle valve
- the present invention analyzes the circuits and mechanical equations of the DC motor 103 and the electronic throttle valve 104 respectively, and transforms the mathematical model into an integral chain system control model for subsequent design through coordinate transformation; (3)
- the system control model 303 is based on the system mathematical model 302, and is processed into a control model that is beneficial to the subsequent controller model design by using mathematical methods.
- the present invention defines the tracking error and its derivative between the actual opening and the expected opening of the electronic throttle valve 104 as system state variables, and introduces the idea of lumped disturbance, including: Source interference, uncertainty, and unknown non-linear quantities in real systems.
- multi-source interference includes transmission friction, spring return torque, gear backlash, and external interference caused by intake air flow, production differences, usage time, etc .
- uncertainty includes modeling errors of friction torque and return spring torque ,
- unknown non-linear quantities include transmission friction torque, gear backlash, and non-linear spring torque Wait.
- the above factors will have a significant impact on the performance of the electronic throttle system.
- the friction torque because the friction characteristics are affected by various factors such as materials, processing technology, and environment, it is usually highly non-linear, and it is difficult to directly establish a friction model.
- Controller model 304 based on the system control model 303, combined with the system's expected output obtained by the operating condition parameter acquisition module 301 (by electronic control Unit 102 is calculated based on the information measured by module 301) Controller model design; (5) Control amount calculation module 305, according to the operating condition parameters obtained by the operating condition parameter acquisition module 301, the system's expected output and the The designed controller model 304 determines the actual control amount acting on the electronic throttle system 100; (6) a drive signal calculation module 306 for calculating the driving voltage of the DC motor 103 according to the control amount obtained by the control amount calculation module 305 the amount.
- the working steps of the observation sub-device 400 designed in this embodiment are: (1) operating condition parameter acquisition module 401, which obtains the operating condition parameters of the electronic throttle system 100 through sensors, measuring instruments and other means. (Usually including the actual valve opening of the electronic throttle valve 104, the fuel efficiency of the engine, external loads, weather and environmental factors, etc.); (2) the observer model 402, based on the system control model 303 in the control sub-device 300 , Designing an effective observer model to obtain the observed values of the system state and aggregate disturbances; (3) the system state and disturbance observation value calculation module 403, according to the operating condition parameters obtained by the operating condition parameter acquisition module 401 and The designed observer model 402 calculates the observation value output by the interference observer; (4)
- the interaction module 404 is used for information transmission between the control sub-device 300 and the observation sub-device 400, including working condition parameters and control Information such as measured values, observed values, etc. Among them, the controlled amount needs to be used not only to control the electronic throttle system 100, but also to the module 40
- This embodiment also provides a method for designing the above control device and method.
- the specific implementation steps are as follows:
- Step 1 Analyze the working principle of the electronic throttle, establish the system mathematical model and the control model, and introduce the idea of lumped disturbance for subsequent design;
- Step 2 Based on the system control model established in Step 1, design observation sub-devices and design finite-time high-order sliding mode observers to obtain system state quantities and aggregate disturbance estimates in a limited time;
- Step 3 Based on the observation sub-device designed in step 2, design the control sub-device and design the continuous terminal sliding mode finite-time controller to realize the finite-time control of the expected opening of the electronic throttle valve, and improve the dynamic and static performance of the system. And anti-interference performance.
- step 1 the specific process of step 1 is:
- a mathematical model of the electronic throttle system 100 is established. Based on the working principle of the electronic throttle system 100, its mathematical model includes a mathematical model of a DC motor 103 and an electronic throttle 104.
- the mathematical model of the DC motor 103 includes the shaft angle and angular velocity of the DC motor 103, the total impedance of the armature circuit, the armature current, and the inductance;
- the mathematical model of the electronic throttle valve 104 includes: the valve opening degree and the angular velocity of the electronic throttle valve 104 The input torque and output torque of the reduction gear, the interference torque caused by the intake air flow, the return spring torque, the load torque and the friction torque.
- this embodiment makes the following assumptions: (1) the armature inductance value is very small, and its inductance dynamics can be ignored; (2) the torque coefficient of the DC motor 103 does not change with changes in temperature and pressure, or The change is very slow; (3) only the Coulomb friction is considered in the friction analysis, and the remaining complex friction characteristics are considered in the lumped interference; (4) the first derivative of the external interference and the second derivative of the reference signal are bounded.
- steps 1-2 a circuit equation of the DC motor 103 is established. According to Kirchhoff's law of voltage and current, the circuit equation of the DC motor 103 can be written as:
- ⁇ m is the rotating shaft angle (rad) of the DC motor 103
- ⁇ m is the rotating shaft angular velocity (rad / s) of the DC motor 103
- R is the total impedance of the armature circuit ( ⁇ )
- L is the armature inductance (H)
- I is the armature current (A)
- u is the PWM equivalent voltage (V)
- k e is the back-EMF coefficient (V / rad / s).
- the DC component By decomposing the PWM voltage signal, the DC component can be regarded as the equivalent armature voltage of the DC motor 103, and expressed as:
- T is a signal period (s)
- s is a high-level duration (s) within a single period of ⁇
- U max is a high-level voltage amplitude (V).
- a mechanical equation of the DC motor 103 is established.
- the mechanical equation of the DC motor 103 can be written as:
- T a k m i of the rotational torque (N ⁇ m) of the DC motor 103, k m rotational moment coefficient (N ⁇ m / A), T m of the reduction gear set input torque 105 (N ⁇ m) , J m is the moment of inertia (kg ⁇ m 2 ) of the DC motor 103, and B m is the viscous damping coefficient (N ⁇ m ⁇ s / rad) of the DC motor 103.
- a mechanical equation of the electronic throttle valve 104 is established. According to the working principle of the electronic throttle valve 104, its mechanical equation can be written as:
- ⁇ t is the valve opening degree (rad) of the electronic throttle valve 104
- ⁇ t is the valve angular velocity (rad / s) of the electronic throttle valve 104
- J t is the moment of inertia (kg ⁇ m 2 ) of the electronic throttle valve 104
- B t is the viscous damping coefficient (N ⁇ m ⁇ s / rad) of the electronic throttle valve 104
- T o is the output torque (N ⁇ m) of the reduction gear set 105
- T L is the interference torque caused by the intake air flow (N ⁇ m)
- T sp is the return moment (N ⁇ m) of the return spring pair 106a, 106b
- T f is the friction moment (N ⁇ m), which can be expressed as:
- K sp is the stiffness coefficient of the return spring (N ⁇ m / rad)
- T LH is the initial moment of the return spring in the default position (N ⁇ m)
- F S ( ⁇ t ) is the nonlinearity of the valve angular velocity ⁇ t Function
- sign ( ⁇ ) represents a sign function.
- Steps 1-5 establish a nonlinear equation of gear backlash. Because the gear backlash is non-smooth and non-smooth, it will significantly affect the system. Therefore, for the subsequent control design, write its equation as:
- T o NT m + d (T m ), (7)
- N is the gear ratio, which satisfies: d (T m ) represents a non-linear function regarding the input torque T m of the reduction gear set 105.
- a mathematical model of the electronic throttle system 100 is established. Based on the above analysis, by eliminating ⁇ m and ⁇ m , the mathematical model of the electronic throttle system 100 can be expressed as follows:
- J is the equivalent moment of inertia of the electronic throttle valve 104 (kg ⁇ m 2 )
- B is the equivalent viscous damping coefficient of the electronic throttle valve 104 (N ⁇ m ⁇ s / rad)
- T D is the sum of disturbances ( N ⁇ m)
- T g is the sum of T sp and T f (N ⁇ m).
- the parameter uncertainties ⁇ J, ⁇ B, ⁇ F S , ⁇ T LH , ⁇ K sp , ⁇ T g, and ⁇ are expressed as:
- J 0 , B 0 , F S0 , T LH0 , K sp0 , and ⁇ 0 represent the nominal values of the electronic throttle system parameters, respectively, The upper bounds of parameter uncertainty are respectively.
- d is the aggregate disturbance in the system, which is expressed as:
- the lumped disturbance includes the following parts: uncertainty, unknown nonlinearity, and multi-source interference.
- the uncertainty is mainly derived from the moment of inertia and viscous damping coefficient of the DC motor 103 and the electronic throttle valve 104, including the frictional torque and the modeling error of the reset spring pair 106a, 106b reset torque;
- the unknown non-linear quantities include transmission friction T f , spring return torque T sp and gear backlash d (T m );
- multi-source interference includes load torque T L caused by intake air flow, engine shake, and parameter changes caused by environmental changes.
- a control model of the electronic throttle system 100 is established. Based on the above modeling and analysis, in order to better perform subsequent design, a control model of the electronic throttle system 100 is established.
- ⁇ ref the desired opening degree (rad) of the valve of the electronic throttle valve 104
- x 1 ⁇ t - ⁇ ref as the state variable of the system, which represents the actual opening degree ⁇ t of the valve of the electronic throttle valve 104 and the expected opening degree ⁇ ref
- x 1 ⁇ t - ⁇ ref as the state variable of the system, which represents the actual opening degree ⁇ t of the valve of the electronic throttle valve 104 and the expected opening degree ⁇ ref
- Differentiate x 1 and define the state variable x 2 of the system as Derivating x 2 gives:
- control model mentioned in the system control model 303 of the control sub-device 300 is established in this step.
- step 2 the specific process of step 2 is:
- this embodiment uses high-order sliding mode theory, based on the designed system control model formula 13 and operating conditions parameters, to design Limited time observer.
- the operating condition parameters include the expected opening degree of the valve of the electronic throttle valve 104, the nominal value of the moment of inertia, the viscous damping coefficient, the reset torque of the return spring pair 106a, 106b, and the friction torque, etc.
- K is the bound of the first derivative of the lumped perturbation d
- z 1 , z 2 , and z 3 are the system output x 1 and unknown respectively.
- Equation 13 the observation error is defined as: And satisfy the following relationships:
- the observer can obtain the observation values of the system state and the lumped disturbance in a limited time and use it in the calculation of the subsequent control amount, so that the switching gain in the control amount need only be greater than the lumped disturbance observation error
- the boundary value of the stub is not required to be greater than the boundary value of the lumped perturbation itself, which will effectively solve the chattering phenomenon caused by high switching gain, and reduce the measurement cost and calculation amount without changing the nominal control characteristics of the system.
- the observer model mentioned in the observer model 402 of the observation sub-device 400 is established in this step.
- step 3 the specific process of step 3 is:
- step 2 Based on step 2, based on the system control model formula 13 and the observer model formula 14, the continuous terminal sliding mode finite time control theory and output feedback control theory are used to design the controller model. While ensuring the continuous control amount, The electronic throttle system 100 is provided with limited time convergence and good anti-interference performance.
- Step 3-1 design the following terminal slip surface:
- s is the sliding variable
- z 2 and z 3 are the observed values of the system unknown state x 2 and the total disturbance d obtained by the observer model formula 14, respectively
- c 1 and c 2 are the sliding mode surface coefficients to be designed
- the polynomial p 2 + c 1 p + c 2 needs to satisfy the Hurwitz condition, that is, the eigenvalues of the polynomial are in the left half plane of the complex plane
- ⁇ 1 and ⁇ 2 are the sliding mode surface coefficients to be designed, and the following relationship is satisfied: Among them, ⁇ (0,1).
- Step 3-2 Based on step 3-1, design the controller model as follows:
- ⁇ > 0 is the controller parameter to be designed.
- the tracking error x 1 of the valve opening degree of the electronic throttle valve 104 can converge to an equilibrium point in a limited time, that is, the valve opening degree ⁇ t of the electronic throttle valve 104 can be tracked on a limited time.
- the opening degree ⁇ ref therefore, the dynamic, static performance and anti-interference performance of the electronic throttle system 100 can be significantly improved.
- the controller model designed in this embodiment includes three parts.
- the first part is the output feedback control: Among them, c 1 and ⁇ 1 are the control parameters, which need to be determined by referring to the operating condition parameters and the system control model. In actual operation, in order to reduce the measurement noise caused by direct measurement, it is more appropriate to use the output value of the filter value for this item Calculation;
- the second part is the feedforward control: Among them, c 2 and ⁇ 2 are the control parameters, which need to be determined by referring to the operating condition parameters and the system control model, and z 2 and z 3 are the observed values of the system state and the aggregate interference obtained by the observer model within a limited time;
- the finite-time convergence of the system guarantees the continuity of
- the controller model mentioned in the controller model 304 of the control sub-device 300 is established in this step.
- some physical quantities such as the actual valve opening of the electronic throttle valve 104 can be directly measured by sensors and other devices, while some physical quantities such as the motor torque of the DC motor 103 and the valve angular velocity of the electronic throttle valve 104 cannot be directly passed Measurements by sensors and other devices need to be obtained indirectly through other measurable information or physical relationships.
- some physical quantities such as the reset torque of the return springs 106a, 106b, and external disturbances, cannot be obtained or are difficult to obtain. They need to be considered as part of the lumped disturbance, and their observations should be obtained by means of an observer. deal with.
- FIG. 5 is a control block diagram of the electronic throttle control system in this embodiment, including an observer, a controller, a controlled system, and the like.
- the control method and device designed in this embodiment can be implemented through software, hardware, and a combination of software and hardware. Way to achieve.
- a non-linear anti-interference control technology is applied to an electronic throttle system.
- the expected valve opening can be quickly and accurately tracked in a limited time to achieve The goal of continuous limited time anti-interference control, and reduce the number of sensors, reduce the system cost, and meet the development requirements and application prospects of electronic throttle systems in the field of high performance and high precision.
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- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
Claims (10)
- 一种针对电子节气门系统的非线性抗干扰控制装置,其特征在于,包括控制子装置和观测子装置,其中,控制子装置包括:运行工况参数获取模块,用于获取电子节气门系统的运行工况参数;系统数学模型,用于通过分析电子节气门的工作原理,建立其数学模型以刻画电子节气门系统的系统特性;系统控制模型,用于在系统数学模型的基础上,运用数学手段将其处理为利于后续控制器模型设计的控制模型;控制器模型,用于在系统控制模型的基础上,结合运行工况参数获取模块所获得的系统期望输出进行控制器模型设计,其中,控制器模型中包含观测值;控制量计算模块,用于根据运行工况参数获取模块所获得的运行工况参数、系统期望输出和所设计的控制器模型,确定作用于电子节气门系统的实际控制量;驱动信号计算模块,用于根据控制量计算模块所得到的控制量计算得到直流电机的驱动电压量;观测子装置包括:运行工况参数获取模块,用于获取电子节气门系统的运行工况参数;观测器模型,用于在控制子装置中的系统控制模型的基础上,设计行之有效的观测器模型从而获得系统状态和集总扰动的观测值,其中,观测器模型中包含控制量;系统状态和干扰观测值计算模块,用于根据运行工况参数获取模块所获得的运行工况参数和所设计的观测器模型,计算得到干扰观测器所输出的观测值;交互模块,用于进行控制子装置与观测子装置之间的信息传递。
- 根据权利要求1所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,所述运行工况参数包括:电子节气门阀门开度的 期望值、电子节气门惯量的标称值、电子节气门的粘滞阻尼系数、复位弹簧转矩以及摩擦转矩。
- 根据权利要求1所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,所述系统数学模型包括以下参数:直流电机的转轴角度及角速度、电子节气门阀门开度及角速度、电枢电路的总阻抗、电枢电流及电感、减速齿轮的输入及输出转矩、由进气气流引起的干扰力矩、复位弹簧转矩、负载转矩以及摩擦力矩。
- 根据权利要求3所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,数学建模过程中分析了直流电机和电子节气门的电路和机械方程,并通过坐标变换,将数学模型转换为便于后续设计的积分链式系统控制模型。
- 根据权利要求1所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,在系统控制模型中分别将电子节气门阀门实际开度与期望开度之间的跟踪误差及其导数定义为系统状态变量,并引入了集总扰动的思想。
- 根据权利要求5所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,所述集总扰动包括以下因素:多源干扰、不确定性以及实际系统中的未知非线性量。
- 根据权利要求6所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,多源干扰包括传动摩擦、弹簧复位转矩、齿轮齿隙以及由进气气流、生产区别、使用时长所引起的外部干扰;不确定性包括摩擦力矩和复位弹簧转矩的建模误差,以及由发动机运行工 况、海拔、气温、气压变化因素所致的直流电机和电子节气门的参数不确定性;未知非线性量包括传动摩擦转矩、齿轮齿隙以及非线性弹簧转矩。
- 根据权利要求1所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,所述控制器模型包括输出反馈控制部分、前馈控制部分以及有限时间控制部分;输出反馈控制部分控制律中包含输出反馈控制项,基于系统实际输出与期望输出之间的跟踪误差,其控制参数依据运行工况参数和系统控制模型而确定;前馈控制部分控制律中包含前馈控制项,基于观测器模型所输出的系统状态和集总扰动的观测值,其控制参数依据运行工况参数、系统控制模型以及观测器模型而确定;有限时间控制部分控制律中包含有限时间控制项,基于所设计的滑模变量,其控制参数依据运行工况参数、系统控制模型以及观测器模型而确定。
- 根据权利要求1所述的针对电子节气门系统的非线性抗干扰控制装置,其特征在于,所述观测器模型基于运行工况参数、系统输出的期望值和系统控制模型设计。
- 一种针对电子节气门系统的非线性抗干扰控制装置的设计方法,包括如下步骤:步骤1,分析电子节气门系统的工作原理,分别建立系统数学模型和控制模型,并引入集总扰动的思想;步骤2,在步骤1建立的系统控制模型基础上,设计观测子装置,设计有限时间观测器,在有限时间内获得系统状态量和集总扰动的估计值;步骤3,在步骤2设计的观测子装置基础上,设计控制子装置,设计连续终端滑模有限时间控制器,结合前馈补偿与输出反馈控制方法,设计非线性抗干扰控制装置。
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