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US 10,472,999 B2Granted
Methods and system for adjusting camshafts
AssigneeFord Global Technologies, LLC
InventorsDavid Pedro, Marcus William Fried
Life of this patent
Estimating the term…
Abstract
Systems and methods for correcting an engine intake camshaft position and an engine exhaust camshaft position for a variable valve timing engine are described. In one example, intake manifold pressure of an engine is sampled while a motor/generator rotates the engine at a predetermined speed without fuel being supplied to the engine. A camshaft angle where minimum intake manifold pressure is observed is a basis for correcting camshaft position.
Claims13
An engine operating method, comprising:
- rotating a first engine via a motor and finding a camshaft angle of the first engine where an intake manifold pressure is a minimum value while not supplying fuel to the first engine;
- adjusting a first camshaft position of the first engine via a controller in response to an error between a predetermined camshaft position of a second engine and the camshaft angle of the first engine where the intake manifold pressure is the minimum value;
- and
- moving a camshaft of the first engine to the adjusted first camshaft position via the controller.
1 more element
A system, comprising:
- an engine;
- a transmission coupled to the engine;
- an electric machine;
- and
- a vehicle system controller including executable instructions stored in non-transitory memory to rotate the engine at a constant predetermined speed without supplying fuel to the engine, and adjusting a position of a camshaft of the engine based on a crankshaft angle where intake manifold pressure is a minimum value while rotating the engine at the constant predetermined speed.
2 more elements
Dependencies are inferred from the claim text.