Oliff & Berridge
Intake device of a two stroke engine with supercharger bypass passage
 A two stroke engine equipped with a mechanically driven supercharger in the intake passage downstream of throttle valve. A bypass air passage bypassing the supercharger is provided, and a bypass air control valve is arranged in the bypass air passage. When the engine is idling, the bypass air control valve is controlled so that the level of vacuum in the intake passage between the throttle valve and the supercharger is maintained at a constant value. 
Toyota Jidosha Kabushiki Kaisha
F F Y F F F
F02D F02B Y02T F02D F02D F02B
additional additional additional inventional inventional inventional
Hiroshi Michio Katsuhiko Yoshio Kichiro Hiroaki Toyokazu Masahiko Norihiko Takao
Noguchi Kawagoe Hirose Kido Kato Nihei Baika Masubuchi Nakamura Tate