Variable cam engine

Details Variable cam engine Variable cam engine

1991-11-21

1992-09-01

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

F01L 134

Patent

active

051430304

ABSTRACT:
This invention relates to a variable cam engine of which each cylinder has at least one valve driven by multiplicity of cams which give different engine torque outputs. This invention provides an engine comprising a decision-making device which decides change-over of the cams along with a selection of a target cam according to the engine running conditions, a cam change-over mechanism which disengages a current cam from the valve and engages said target cam instead, a crank shaft angle sensor, a sequential control device which, when the cam change-over is made at an engine speed below a predetermined speed, actuates the cam change-over mechanism at predetermined intervals starting form a specific cylinder and proceeding in turn through the other cylinders, and a regulating device which regulates the combustion in each cylinder corresponding to the cam change-over. The fuel supply quantity and ignition period are thereby regulated according to the cam change-over for each cylinder, a torque step due to the cam change-over is prevented, and the cam change-over takes place smoothly.

REFERENCES:
patent: 4917057 (1990-04-01), Seki
patent: 4962732 (1990-10-01), Inoue et al.
patent: 4996954 (1991-03-01), Seki et al.
patent: 5009203 (1991-04-01), Seki
patent: 5024191 (1991-06-01), Nagahiro et al.

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