Control Systems and Strategies for Automated Manual and Double Clutch Transmissions

Abstract

Abstract Automated manual transmissions ( AMT ) and double clutch transmissions ( DCT ) can increase comfort while simultaneously reducing fuel consumption and emissions. To implement AMT and DCT into a vehicle powertrain, numerous hardware components have to work together. These include several design variants of electric motors, control units, sensors, and, depending on the design, an electrohydraulic, electromechanical, or hydrostatic actuating mechanism. Depending on the combination and design of these components, various concepts can be considered and transmission types developed that satisfy not only the specific requirements of the OEMs but also the individual applications. From a software perspective, the higher level functional logic is particularly important. Through appropriate control logic and adaption routines, this functional logic must ensure a consistently high level of comfort over the entire life. Irrespective of the specific design, an automatic transmission is only part of the overall vehicle system. The high complexity and the strong interaction between the subsystems require intensive alignment and testing of the subsystems as well as the overall system. If the automated forms of manual transmission are also to expand in other markets and compete with classic automatic transmissions, however, further improvements must be implemented in terms of efficiency (including weight and mounting space), comfort, and cost.