[introduction]Publish act to drive as each country government reduce internal-combustion engine (the greenhouse gas that ICE) car discharges, original equipment manufacturer (OEM) redesigns mechanical system in succession control a system for the electron. Systematic join of Gao Shuiping and intelligent technology make drive automatically the car becomes reality, because this market is right,electronic product and the demand with algorithmic software increase ceaselessly, include international Organization for Standardization in order to accord with (ISO) 26262 inside each safe requirement.

Publish act to drive as each country government reduce internal-combustion engine (the greenhouse gas that ICE) car discharges, original equipment manufacturer (OEM) redesigns mechanical system in succession control a system for the electron. Systematic join of Gao Shuiping and intelligent technology make drive automatically the car becomes reality, because this market is right,electronic product and the demand with algorithmic software increase ceaselessly, include international Organization for Standardization in order to accord with (ISO) 26262 inside each safe requirement.

Sensor, especially angle sensor, indispensable in the system that needs standard of contented function safety. It conduces to monitoring and provide torque and angle information, and these information are efficient drive or run all sorts of car system place to need.

Design EPS system

Dynamoelectric aid force to turn to a system (EPS) by turn to control of column, electron to change electric machinery and electronic induction and control mechanism to composition. When driver roll steering wheel, by electric machinery (it is to not have normally brush dc machine) assistance changes direction, this replaced traditional machinery and hydraulic pressure system.

The advantage of EPS system includes to move faster and more intelligence, reduce carbon dioxide to discharge, improve fuel efficiency and enhance user experience. The driver offers systematic input in steering wheel interface. Sensor detects of the position of electric machinery axis and steering wheel rotate, transmit data the electron to control unit (ECU) . Graph 1 highlight the woof that showed EPS system.

Graph 1: EPS system

The package that place of design EPS system needs includes He Jing of driver of small controller, sensor, power source, electric machinery body canal. These component are efficient to the system correspond and move crucial. If the graph is shown 2 times, controller local area network is the bus line level that is used at join car ECU.

 

Graph 2: EPS system block diagram

Heart state apparatus (the TMAG6181-Q1 of TI) is anisotropy magnetoresistive (AMR) angle sensor. It has compositive signal to move section amplifier, can offer bring to bear on with place the sine needing branch related the direction of planar magnetic field and cosine imitate output.

The defer of TMAG6181-Q1 under 2 μ S, angle error is 0.4 degrees only, conduce to improve systematic performance and efficiency greatly. Of sensor compositive tally of v/LIT all over the ground number can dog electric machinery is highest below regular operation pattern 32, 000 turn / cent (below the rotate speed of Rpm) and mode of low power comsumption highest 8, the rotate speed of 000 Rpm. It still can support a variety of parts of an apparatus and systematic level to diagnose a function, can detect, monitoring and the breakdown during report parts of an apparatus moves. For example, below Morpheus or breakdown mode, the output of TMAG6181-Q1 AMR sensor will enter tall impedance state. The proposal uses next pulling or go up help resistance, in order to ensure small controller can detect breakdown.

Should handle AMR to output signal and draw the angle position of EPS electric machinery or steering wheel, need exterior small controller normally. The AMR angle sensor in TMAG6181-Q1 can be used at Chan Duan or poor cent outputs mode; A kind of mode can eliminate a system after medium in all modular interference. The sine of the output that need branch that comes from AMR sensor and cosine signal and place bring to bear on the angle of magnetic field becomes direct ratio. The output voltage of AMR sensor and power source voltage become scale, in order to ensure exterior ADC can consult power source voltage.

Graph 3 showed picture of a representative application, differ cent to output signal SIN_P, SIN_N, COS_P and COS_N to join 4 Chan Duanmo in exterior small controller count converter among them, and the ECU in exterior small controller and EPS system corresponds.

Graph 3: Chan Duan outputs the TMAG6181-Q1 below mode

If have, the proposal uses the ADC that need branch, because it can raise dependability. Want to obtain high accuracy, laden capacitor and resistor must match each other. TMAG6181-Q1 can bring the drive on the foot to be as high as the load allowing a gender of 10nF in AMR output directly, and the resistance that drive helps electric current and fill electric current be as high as 1mA is laden. What this can implement EPS system is smooth and reliable move.

Add up to compasses sex to simplify, offerred ISO 26262 system to design documentation in the light of TMAG6181-Q1, among them grade of automobile safety integrality is as high as B class.

Design dynamoelectric bicycle and system of dynamoelectric footplate car

Dynamoelectric bicycle is the bicycle that includes 5 crucial package: Electric machinery, batteries, control equipment, sensor and indication screen. Electric machinery is the one part with dynamoelectric indispensable bicycle, can use at needs additional electric power is being provided during the foot steps. If pursue,4 medium block diagram are shown, if want efficient and reliable ground to rotate electric machinery (can install advanced ministry, in the center of or hind) , need angle sensor.

Dynamoelectric footplate car is from drive burning gas changeover is electric footplate car. Design of its system of electric machinery drive and dynamoelectric bicycle are very similar, just it is done not have so complex. Electric machinery power supply is when design of dynamoelectric footplate car needs to walk in accelerator only can, but the base that dynamoelectric bicycle design still must monitor caballero steps power, in order to decide the power supply to electric machinery is measured. Different area asks dynamoelectric bicycle and dynamoelectric footplate car reach as similar as automobile industry safe level.

Graph the package that 4 keys introduced to develop place of dynamoelectric bicycle system to need. Angle sensor can offer angle feedback, feedback by angle of small controller computation next, rotate reliably effectively thereby electric machinery. Normally limitation is AMR sensor 180 degrees, but the output of sensor of suddenly Er effect that TMAG6181-Q1 increased two independence in X and Y axis, can expand the angle limits of sensor 360 degrees.

Graph 4: Dynamoelectric bicycle block diagram

Epilogue

Current car and dynamoelectric bicycle include many ECU, use at drive and control advanced function. Design EPS system, dynamoelectric bicycle or ECU of need of dynamoelectric footplate car are controlled accurately, in order to come true efficient and reliable move. TMAG6181-Q1 can realize faster, more accurate electric machinery control, conduce to improve systematic performance.

Other natural resources

· Heart state apparatus (TI) , TMAG6180-6181 evaluates module tool.

· Heart state apparatus (TI) , ? How do car function security and TI help a client through sensor of high accuracy positionTechnical white paper.

· Heart state apparatus (TI) , The advantage of v/LIT all over the ground number of low power comsumption in AMR inductionUse brief report.

About heart state apparatus (TI)

Heart state apparatus (TI) (Na Sida overcomes stock code: TXN) it is a global semiconductor company, devote oneself to to design, make, test and sale imitate and embedded processing chip, use at the market such as equipment of product of electron of industry, car, individual, communication and company system. We devote oneself to to let electronic product through semiconductor technology more economy is practical, create a better world. Nowadays, every generation innovation is built going up over the foundation that generation innovates, make our technology becomes more cabinet, faster, more reliable, more substantial, realize the semiconductor wide application in electronic product domain thereby, this is the progress of the project. This is us tens of year come and even the thing that doing all the time now.

Avoid duty statement: The article is reprint an article, reprint this article purpose to depend on passing more information, the person that copyright puts in original work ‘s charge is all. If involve work copyright issue,article place uses video, picture, written language, contact please small make up undertake handling.