A microprocessor controlled gearbox for use in electric and hybrid-electric vehicles

This paper describes the automation and control of a 'manual'synchromesh gearbox in a form suitable for use in an electric or hybrid-electric vehicle. Such a computer controlled transmission system allows full integration and control of the drive train leading to improved vehicle performance. The automation process is described, and a full description given, of the computer control algorithms necessary to ensure smooth and reliable operation of the transmission system. It is shown that an up-change can be achieved in 1.4 seconds and a down-change in 1.2 seconds. These times are shown to represent maximum gear change times and details of how they can be reduced substantially are discussed.