Variable valve actuation control system

Details Variable valve actuation control system Variable valve actuation control system

1993-04-09

1994-01-25

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9016, F01L 134

Patent

active

052807703

ABSTRACT:
In a control system for a valve actuation property variable control device which can switch over between a plurality of modes including a low speed mode for adapting at least one of an intake valve and an exhaust valve of an engine to a low speed range and a high speed mode for adapting the valve to a high speed range at least according to the rotational speed of the engine and a representative temperature of the engine, to prevent an abrupt change in the engine output by switching over valve actuating properties while the engine is being warmed up, the load condition of the engine is detected so that the transition from the low speed mode to the high speed mode may be prohibited if the representative temperature of the engine exceeds a prescribed level while a load higher than a prescribed level is being detected. Thereby, the driveability of the engine is improved.

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patent: 4887561 (1989-12-01), Kishi
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patent: 5009203 (1991-04-01), Seki
patent: 5046461 (1991-09-01), Kanehiro et al.
patent: 5143031 (1992-09-01), Bruestle

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