Intake and exhaust control apparatus for internal combustion eng

Details Intake and exhaust control apparatus for internal combustion eng Intake and exhaust control apparatus for internal combustion eng

1990-12-18

1992-07-28

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9016, 123 9031, F01L 134

Patent

active

051333104

ABSTRACT:
An intake-exhaust control system includes a mechanism for changing timings at which the open periods of intake and/or exhaust valves overlap. A control unit cooperates with the valve timing changing mechanism to cause it to change the timing stepwise so as to vary the valve overlap in time, or in degrees, in a plurality of steps according to engine operating conditions, such as engine speed and engine load. The valve overlap, when the engine operates under medium or moderate engine speeds, is varied so as to be larger or longer under medium engine loads than under higher or heavier and lower or lighter engine loads.

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