Combustion chamber for reverse tumble spark ignition direct injection engine
摘要
Superior piston bowl and combustion chamber configurations are designed for a reverse tumble spark ignition direct injection engine. The piston includes a shallow bowl extending from adjacent an edge of the piston head to an inner side slightly beyond a peak. The bowl features a bowl lip re-entrant angle (48) at the spark plug location having an open or positive re-entrant angle. On lateral edges of the bowl between the inner and outer edges, wing like extensions include negative re-entrant angles (52). These help contain the injected fuel within the bowl during combustion. Other features of the combustion chamber include vertical intake ports that produce a weak reverse tumbling air flow motion with a tumble ratio of about 0.6, which allows increased flow efficiency of the port. An injector spray cone angle of 90 degrees is preferred with a bowl sized to capture the spray. Various additional features are disclosed. <IMAGE>
申请公布号
EP1338782(A1)
申请公布日期
2003.08.27
申请号
EP20020027076
申请日期
2002.12.03
申请人
GENERAL MOTORS CORPORATION
发明人
HUEBLER, MARK STEVEN;MILLERMAN, ALEXANDER;OTTO, RONALD M.;SOLOMON, ARUN SUSHILKUMAR PAULRAJ;SZEKELY, GERALD ANDREW, JR.;TSAI, PING-HO