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With advantages of high efficiency and low cost, AMT (Automated Manual Transmission) has a very potential for auto-transmission, especially for heavy commercial vehicle, which has special requirements on low cost and easier operating. Recent years, some developments on multi-speed and electronic control, give us more confidence to consider AMT for heavy commercial vehicles, which offers a convenient and low cost way to multi-speed, and existed abundant gas resource for providing driven power. On the other hand, some technique issues challenge AMT in the application widely. For example, It is difficult to realize servo control for compressibility of gas. It therefore needs to find a way to realize the accurate control on auto-clutch operation system based on high quality system response. Accordingly, this work presents a system to realize hydraulic control powered with pneumatic power resource.

The general way to generate shifting schedule for a new developed vehicle is taking manual calibration way and doing test on the real vehicle that means a time-costing duty. Shift schedule auto-generation has been taken by more and more manufactures for its high efficiency. For auto-generation way, two groups of data set are important. The first is engine steady test data; and the other is drivability constraints defined by customers. Some useful results have been achieved in the field of passenger cars. But for off-road vehicle, there are some special requirements needed to consider, such as vehicle mass, 4WD function and etc. Four-wheel drive vehicles ask for more attraction for improving their performance considering their working in various driving environment. Automatic Transmission has been widely equipped in demanding off-road vehicles responding to the complex driving requirements for its advantage of easy operating.