Development Of Control System For Power-Supported Synchronic AMT Based On DSP&ARM

Automated Mechanical Transmission (AMT) plays more and more importantrole in automobile powertrain system. The driver drives automobile simplly withAMT, and the driver only needs to control the accelerograph, AMT chooses the bestopportunity to shift gears to improve the driving confortability and reliability. Forfurther improving the performance and economy of AMT, Every automobilecompany invests a huge amount of money for the innovation of AMT.The paper submits a new AMT structure. It regulates the speed of a small motorthrough tracing the speed of engine with ECU by adding a small motor on theoutputting axis, and shifts gears automatically by a air pump when both speed'sdifference within a very minor range .It can replace the complicated hydraulicstructure and synchronism implement in the former AMT structure in order to prolongthe life of AMT and to reduce the chances of fixing. We had built a power-supportedsynchronic AMT developing platform in order to check the theory's feasibility. Wehad designed a set of independent controller based on the DSP & ARM chip in orderto optimize automatically shifting strategy and provide experiment bench for theautomatic gear box development.The control system hardware based on DSP & ARM is composed of two parts.One bases on S3C44BOX microprocessor chip, and the other bases on DSP2407Amicroprocessor chip. According to actual experiment's need, the controller based onDSP2407A gathers various experiment data, while the other controller based onS3C44BOX realizes the data storing and the interface of man-machine. Theycommunicate through the hardware-programming logic chip which is named CPLD.The hardware design of the DSP controller includes power module, A/D module, D/Amodule, IO module and serial communication module. The hardware design of theARM controller includes power module, data storing module based on Nand-flash,LCD display module and USB communication interface module.The software of Assembly control system includes driver and applicationprogram. The driver program relates hardware system.The paper had completed A/D driver program,D/A program,gear box driver, serial communication driver,Nand-flash driver and LCD driver. The application program had completed the PIDsynchronization control algorithm, the CPLD communication task, the data storagetask, the string mouth debugging task, the LCD display task, and the data gatheringtask.According to the experiment on the testing bench, the assembly controller basedon DSP & ARM shows characters of working stability, high precision, storingstability, friendly interfere with man-machine. It has a strong expanding function andprovided reliable soft and hardware developing platform in order to further improveand evaluate power-supported synchronic AMT.