Method for operating a hydraulically controlled/regulated camsha

Details Method for operating a hydraulically controlled/regulated camsha Method for operating a hydraulically controlled/regulated camsha

1996-08-09

1998-01-06

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344

Patent

active

057043175

ABSTRACT:
In a method for operating a hydraulically controlled/regulated camshaft adjuster for internal combustion engines, in which a mechanical adjusting device designed to retard the camshaft is controlled by a piston that is hydraulically chargeable on at least one side, to which piston a pressure medium from a hydraulic circuit with a separately driven pump is supplied to an accumulator and to a valve controlled as a function of the operating point, in order to reduce harmful exhaust components when the engine starts, when the engine starts, pressure medium is supplied to the piston from an essentially full accumulator as a function of a start signal under valve control in order to advance the camshaft using the adjusting device.

REFERENCES:
patent: 4787345 (1988-11-01), Thoma
patent: 5127375 (1992-07-01), Bowman et al.
patent: 5243935 (1993-09-01), Kano et al.
patent: 5509383 (1996-04-01), Kahrs et al.

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