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Getting Power to the Pavement
Published in Patrick Hossay, Automotive Innovation, 2019
Clearly, digital control is indispensible to the AMT. A transmission control unit (TCU) combines torque, vehicle speed, engine speed, and throttle data from the ECU with transmission specific information from gear, clutch, and brake position sensors, as well as transmission output speed. Moving the shifter sends an electronic signal, not a mechanical transfer, a so-called shift-by-wire system. When a shift is called for by the driver or indicated by the algorithm, optimal torque, engine speed and shift timing are defined for a fast and smooth gear transition. Clutch disengagement, shift, and reengagement then all occur automatically. When downshifting, the control module revs the engine upon disengagement to achieve rev matching (matching the engine speed to the transmission shaft speed) and so allow for smooth reengagement. In fact, while not done, it could be possible to operate such as system with no use of a clutch at all given the precise control possible.4 In most systems, gears can be skipped to allow the most effective ratio, while precisely matching engine and transmission speeds to avoid lurching or lugging the engine.
Concept of a design activity supporting tool in the design and development process of cyber physical system
Published in International Journal of Computer Integrated Manufacturing, 2022
J. Pokojski, L. Knap, S. Skotnicki
The project was developed by a company carrying out specialized projects for a tractor manufacturer. The tractor manufacturer has developed a new generation transmission for an agricultural tractor. The main component of the transmission is a section with 4 gears switchable under load and with forward/reverse gears. All these gears (as well as the PTO drive, front drive, and differential lock) are controlled by switching on/off the wet multi-plate clutches controlled hydraulically by means of electromagnetic proportional valves controlled by the designed TCU. The transmission is also equipped with a whole range of other functionalities like brakes, 3-point tractor hitch, etc. The TCU is also responsible for monitoring the transmission, and collecting, archiving and presenting information on three different levels of detail to the operator, service, or manufacturer.