Variable valve lift mechanism used in an internal combustion engine

A variable lift valve mechanism for cooperating with a crankshaft-synchronized cam and a rocker arm to actuate a valve in an internal combustion engine, said mechanism comprising:

• an outer case having a pressure chamber formed therein, one end of said outer case abutting said cam;
• an inner case having an oil chamber formed therein and being slidably and sealingly disposed in said outer case, one end of said inner case abutting one end of said rocker arm;
• a first check valve disposed between said pressure chamber and said oil chamber for controlling one-way fluid communication from said oil chamber to said pressure chamber;
• an electromagnetic valve actuated in response to changes in operating conditions of said engine, said electromagnetic valve being in fluid communication with said pressure chamber;
• an engine load sensor in electrical communication with said electromagnetic valve for detecting engine load as an operating condition of said engine;
• a temperature sensor in electrical communication with said electromagnetic valve for detecting engine temperature as an operating condition of said engine;
• a second check valve disposed between said pressure chamber and said electromagnetic valve for controlling one-way fluid communication from said pressure chamber to said electro-magnetic valve;
• and
• a pressure sensor in electrical communication with said electromagnetic valve disposed between said second check valve and said electromagnetic valve for sensing fluid pressure therein, whereby said electromagnetic valve is actuated in response to said engine load and temperature for maintaining said sensed fluid pressure at a predetermined level.