CN202250418U

CN202250418U - Electronic throttle control device based on single-chip microcontroller

Info

Publication number: CN202250418U
Application number: CN2011203982013U
Authority: CN
Inventors: 韩毅; 张双喜; 谢昊原; 刘伟; 赵康; 王金洋; 丁磊
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2011-10-19
Filing date: 2011-10-19
Publication date: 2012-05-30
Anticipated expiration: 2021-10-19

Abstract

The utility model discloses an electronic throttle control device based on a single-chip microcontroller, which comprises a power supply module, an opening sensor arranged on the position of a throttle, a position sensor arranged on an accelerator pedal, a motor control unit connected with a drive motor, and also a core control unit. The core control unit is respectively connected with the opening sensor, the accelerator sensor and the motor control unit, and the power supply module is connected with the core control unit after voltage reduction. The information collected by the sensor units is processed by the single-chip microcontroller, the processed steering control signals are transmitted to the motor control unit, and thus the accurate control of the throttle can be achieved.

Description

A kind of SCM Based electronic air throttle control device

Technical field

The utility model relates to the intellectuality control field of closure, relates in particular to a kind of SCM Based electronic air throttle control device.

Background technique

The research work of electronic throttle originates from the seventies in last century, begins to have product to come out from the eighties in last century, and in recent decades, the research to electronic throttle has abroad obtained very fast development.Development trend can be summarized as: on control strategy, develop into nonlinear Control by linearity control; Develop into independently electronic throttle system by the auxiliary electron closure;, take into account and improve power character, Economy, control stability, emission performance and riding comfort to integrated various control function from single control function development.The research and development of electronic throttle system have had very big progress; But it is still immature technically; Therefore application is very not extensive yet, but electronic throttle system reduces discharging and being of great importance improving vehicle power property, Economy, Security, riding comfort.21 century new energy development and the situation of electronic control technology develop rapidly under, along with cost of production descends and emission request improves constantly, the universal use of electronic throttle system will become inevitable.

Summary of the invention

The purpose of the utility model is, a kind of SCM Based electronic air throttle control device is provided.It can solve the accurate control problem of closure, the information of promptly coming the processes sensor unit to gather through single-chip microcomputer, and the steering controling signal after will handling then sends drive circuit to.Thereby reach the accurate control of closure.

To achieve these goals, the utility model adopts following technological scheme to be achieved:

A kind of SCM Based electronic air throttle control device; It is characterized in that; Comprise power module, be installed in throttle position jaw opening sensor, be installed in the position transducer on the gas pedal, the motor control unit that is connected with drive motor and key control unit, wherein; Key control unit is connected with jaw opening sensor, position transducer, motor control unit respectively, and power module is connected with key control unit after step-down.

The SCM Based electronic air throttle control device of the utility model, the driver who gathers according to the key control unit pedal aperture of stepping on the throttle, accelerator pedal position sensor converts the gas pedal stroke to the target electrical signal.Simultaneously, engine load sensor also converts the actual aperture of closure to the actual electrical signal.These two signals are sent into single-chip microcomputer simultaneously and are compared.If target signal is different with actual signal; The declarative section valve opening does not reach the control requirement; Then single-chip microcomputer changes the dutycycle of output PWM, to change the average voltage of drive motor, makes motor driving moment of torsion and spring reply moment of torsion and reaches new equilibrium position; The control throttle opening changes, and reaches target call.

Description of drawings

Fig. 1 is a system hardware general arrangement schematic representation.

Fig. 2 regulates schematic representation for system voltage.

Fig. 3 is just changeing schematic representation for the H bridge.

Fig. 4 is a main program flow chart.

Fig. 5 is a throttle valve angle counting subroutine flow chart.

Fig. 6 is a PID control system schematic diagram.

Below in conjunction with accompanying drawing and embodiment the utility model is further specified

Embodiment

With reference to Fig. 1; The SCM Based electronic air throttle control device of the utility model; Comprise power module, be installed in the jaw opening sensor of throttle position, the throttle sensor that is installed in accelerator pedal position, the motor control unit that is connected with drive motor and key control unit, wherein; Key control unit is connected with jaw opening sensor, throttle sensor, motor control unit respectively, and power module is connected with key control unit after step-down.

Said core controller adopts 16 single-chip microcomputer MC9S12XS128, and this Series chip has a wide range of applications at vehicle electric field.The central processor CPU 12 of single-chip microcomputer MC9S12XS128 is made up of following three parts: arithmetic logic unit alu, control unit and register group.CPU external bus frequency is 8MHZ or 16MHZ, through inner phaselocked loop (PLL), can make Internal Bus speed can reach 25MHZ.Register in the internal register group, stack pointer and index register are 16.It has very strong higher-level language support function.The accumulator A of CPU12 and B are 8, also can form 16 bit accumulator D.

Said motor control unit just adopts horizontal pulse modulation (pulse width modulation is called for short PWM) control mode, and the circuit of this control mode adopts H bridge drive circuit, so-called H bridge drive circuit control motor positive and inverse.Present embodiment has used 2 road pwm control signals, is used for controlling motor-drive circuit.The information that jaw opening sensor on the throttle position and the position transducer on the gas pedal are collected is delivered among the single-chip microcomputer MC9S12XS128B and is handled.

With reference to Fig. 2, power module provides reliable work voltage for each module proper functioning.In control system of electronic throttle valve, the jaw opening sensor of key control unit, throttle position, the position transducer on the gas pedal all are 5V; Drive motor can directly provide operating voltage by the 12V power supply for it.Supply voltage supplies single-chip microcomputer MC9S12XS128 through 7805 chip voltage stabilizings to 5V, the jaw opening sensor on the throttle position, the position transducer on the gas pedal use.

With reference to Fig. 3, the H bridge circuit is made up of 2 P type field effect transistor Q1, Q2 and 2 N type field effect transistor Q3, Q4, so it is P-NMOS pipe H bridge.4 field effect transistors on the brachium pontis are equivalent to four switches, and the conducting when grid is low level of P type pipe is closed during high level; The conducting when grid is high level of N type pipe is closed during low level.Field effect transistor is a voltage-controlled component, and the electric current that grid passes through is almost " zero ".Just because of these characteristics, after connecting figure below circuit, control arm 1 puts high level (U=VCC), when control arm 2 is put low level (U=0), and Q1, Q4 close, Q2, Q3 conducting, and motor left end low level, the right-hand member high level is so electric current flows along the direction of arrow.Being made as motor just changes.

With reference to Fig. 4, native system The software adopted modularization programming, inquiry mode work, main program has: system initialization routine, A/D conversion routine, data processing subroutine, Electric Machine Control subroutine, System self-test subroutine.Wherein, V is the actual velocity of automobile, and V ' is a target vehicle speed, and θ is an actual throttle angle, θ _dBe the target opening angle, n is an actual engine speed, and n ' is a target idling speed value.

Initialization section is mainly used in the initialization of accomplishing constant and variable; Single-chip microcomputer MC9S12XS128 output PWM initialization and data initialization.The work cycle of control software partly comprises the collection of signal, fault judgement, electronic throttle angle and the pedal angle calculation of sensor, according to control algorithm compute control amount and serial communication etc.

With reference to Fig. 5, in the program running, need to calculate the given angle of pedal and the feedback angle of closure.According to the input signal of TPS and PPS and the relation of level angle separately, can calculate input angle and feedback angle.In addition, need the angle of pedal input be converted, corresponding with the aperture that guarantees pedal with the aperture of closure.

With reference to Fig. 6, PID control is controlling method the most classical in the present control technique, and it is the mode that ratio (P-Proportional), integration (I-Integral), differential (D-Derivative) linear combination in deviation are controlled.In pid control algorithm, there are ratio, integration, three kinds of control actions of differential.PID controls the linear combination of these three kinds of controls just.Ratio (P), integration (I) and the differential (D) of deviation are constituted controlled quentity controlled variable through linear combination, controlled device is controlled, just constituted the PID controller with this controlled quentity controlled variable.

Claims

1. SCM Based electronic air throttle control device; It is characterized in that; Comprise power module, be installed in throttle position jaw opening sensor, be installed in the position transducer on the gas pedal, the motor control unit that is connected with drive motor and key control unit, wherein; Key control unit is connected with jaw opening sensor, throttle sensor, motor control unit respectively, and power module is connected with key control unit after step-down.

2. SCM Based electronic air throttle control device as claimed in claim 1 is characterized in that, described key control unit adopts single-chip microcomputer MC9S12XS128.

3. SCM Based electronic air throttle control device as claimed in claim 1 is characterized in that, described motor control unit adopts H bridge drive circuit.

4. SCM Based electronic air throttle control device as claimed in claim 3 is characterized in that, said H bridge circuit is made up of 2 P type field effect transistors and 2 N type field effect transistors.