Electromagnetic valve drive apparatus of internal combustion engine,申请号EP20000126805-传众专利搜索

Electromagnetic valve drive apparatus of internal combustion engine

申请公布号：EP1106808(A3)

申请号：EP20000126805

申请日期：2000.12.06

申请公布日期：2003.03.19

申请人：

TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人：YANAI, AKIHIRO;MAKITA, MITSUGU

分类号：F01L9/04;F01L9/00;F02D13/02;F02D41/20;F16K31/06

主分类号：F01L9/04

摘要：An electromagnetic valve drive apparatus of an internal combustion engine has a three-switching element in-series type drive circuit (92a). Through switching operations of switching elements that are shared by eight electromagnetic coils consisting of upper coils (122a, 122b, 122g, 122h) and lower coils (124a, 124b, 124g, 124f) of four valves (12a, 12b, 12g, 12h). The four valves (12a, 12b, 12g, 12h) include a first two valves (12a, 12b) that perform identical operations and a second two valves (12g, 12h) whose open period does not overlap the open period of the first two valves (12a, 12b). The three-switching element (200, 202, 204) in-series type drive circuit (92a) is able to supply current and to rapidly reduce, or discontinue, current through the electromagnetic coils. The electromagnetic valve drive apparatus is able to control the quantity of current through the electromagnetic coils while reducing the number of switching elements employed. <IMAGE>