Development of Permanently Engaged Gear Mechanism for Idle Stop

Abstract

The permanently engaged gear mechanism has been developed for new idle stop system. It realizes excellent low NV and quick response during engine stop and restart phase, and also responds immediately to driver's engine restarting request before the engine is completely stopped. The system concept was realized through comparison of various engine starting methods, which finally resulted in the selection of a permanently engaged gear mechanism as best system for stop&start functionalities. Analysis of issues such as mechanical component stress and usage conditions was done usig simulation, evaluation with real vehicles, component unit test and field tests. Thereafter this mechanism was designed appropriately and full reliability of the engine starting process was realized.