Linear Force Solenoid
2016 - PACE Award Winner
What: New solenoid design eliminates transmission components
Innovation: The solenoid can take control of transmission components, eliminating hydraulic and other parts often used to transfer force in current gearbox designs. The solenoid enables manufacturers to develop more efficient, high-speed transmissions without increasing weight.
First Customer: Daimler
Judge's Citation: With the rapidly increasing use of 8 to 10 speed transmissions for fuel efficiency, shift quality and shift speed become even more important. Bosch has addressed these and other transmission needs with their electromagnetic Linear Force Solenoid (LFS) replacing the hydraulic pilot valves in transmission clutch actuators. The LFS eliminates the efficiency losses and concerns with oil contamination of pilot valves, while helping to squeeze more gears and their controls into the tightly-limited transmission space. The LFS also enables modifying the transmission shift characteristics under software control. This saves months of time in optimizing the shift quality of new transmissions, compared to the iterative substitution of different pilot valves previously required. The Bosch LFS was first used on a 2014 Daimler 9-speed transmission, with subsequent applications in Ford and GM 9-speed transmissions.
<Web site: bosch.com