Fast start hydraulic system for electrohydraulic valvetrain

Details Fast start hydraulic system for electrohydraulic valvetrain Fast start hydraulic system for electrohydraulic valvetrain

1994-06-27

1995-05-02

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9015, F01L 902

Patent

active

054109949

ABSTRACT:
A hydraulic system for controlling an engine valvetrain wherein each of the reciprocating intake and/or exhaust valves is hydraulically controlled and selectively connected to a source of high pressure fluid and a source of low pressure fluid. The hydraulic system maintains fluid pressure both when the engine is running, by employing a pump and an auxiliary pump, and when engine is off, by employing an accumulator and by selectively employing an auxiliary pump controlled by an engine control system. By maintaining pressure in the hydraulic system, the engine valves begin operating immediately upon start-up of the engine even after it has been left idle for an extended period of time.

REFERENCES:
patent: 1265103 (1918-05-01), Nacker
patent: 4188925 (1980-02-01), Jordan
patent: 4930464 (1990-06-01), Letsche
patent: 5255641 (1993-10-01), Schechter
patent: 5275136 (1994-01-01), Schechter et al.

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