Oliff & Berridge, PLC
Valve timing control apparatus and method for internal combustion engine
During a course of stopping an engine, the oil pressure in a timing advance-side hydraulic chamber and the oil pressure in a timing retard-side hydraulic chamber of a variable valve timing mechanism are adjusted so that the relative rotation phase of an intake camshaft changes to the timing advanced side of a phase (predetermined advanced state) corresponding to the engine start-up timing. After the relative rotation phase has changed to the advanced side of the predetermined advanced state, the duty ratio D, that is, a control quantity used to adjust the oil pressure, is fixed to a value that holds the relative rotation phase.
Toyota Jidosha Kabushiki Kaisha
F F F
F01L F01L F01L
additional inventional inventional
Makoto Yoshikazu Masahiro
Nishimura Ishii Ozawa