Method for controlling the compression ratio of an internal...

Details Method for controlling the compression ratio of an internal... Method for controlling the compression ratio of an internal...

2005-02-22

2005-02-22

McMahon, Marguerite J. (Department: 3747)

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

C123S0780AA

Reexamination Certificate

active

06857400

ABSTRACT:
A method for controlling the compression ratio ε in a supercharged combustion engine. The latter is provided with a control device in which a maximum final compression temperature T2,maxis ascertained, and, within the framework of a precontrol, an optimum efficiency compression ratio εoptis ascertained. The knock limit is determined from the compression ratio ε, to which it corresponds, and which is ascertained from the precontrol. As a function of the efficiency curve in the characteristics map η=f, a further change occurs in compression ratio γ or a setting back of the change in compression ratio ε. The values learned for ε and the ignition angle as a function of the operating point are permanently stored in a characteristics map to which the engine control has access.

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