Variable effective compression ratio using VVT
AssigneeFord Global Technologies, LLC
InventorPatrick Joseph Phlips
Life of this patent
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Abstract
The invention relates to a diesel engine in which a separate camshaft (12) for independently controlling the closing of the inlet valves (IVC) is provided, which camshaft is coupled to phase-shifting mechanism (14). By delaying the closing of the inlet valves independent from other valve events, it is possible to vary the effective compression ratio of the diesel engine. The extent of the delay of the closing of the inlet valves is, preferably, adjusted based on the engine speed, the engine torque and/or the charging pressure of a turbocharger.
Claims16
A diesel engine having at least one bank of cylinders with at least one inlet valve and at least one exhaust valve per cylinder, comprising:
- a first camshaft for the inlet valve, said first camshaft controlling the opening of the inlet valve;
- and
- a second camshaft for the inlet valve, said second camshaft controlling the closing time of the inlet valve;
- and
- a camshaft phasing mechanism coupled to said second camshaft.
A method for controlling valve timing in a diesel engine, the engine having at least one cylinder and at least one inlet valve and at least one exhaust valve per cylinder, the engine also having a first camshaft for controlling the opening of the inlet valve and a second camshaft for controlling the closing of the inlet valve, the method comprising:
- adjusting closing time of the inlet valve based on an engine speed wherein said adjustment is effected by a camshaft phaser coupled to the second camshaft.
Dependencies are inferred from the claim text.