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US 10,094,304 B1Granted
System and method for diagnosing a variable displacement engine
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
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Abstract
Systems and methods for determining operation of a cylinder deactivating/reactivating device are disclosed. In one example, a direction of engine rotation is selected to maximize air flow through the engine while the engine is rotated without combusting air and fuel. Operation of one or more cylinder valve deactivating mechanisms is assessed while the engine is rotated without combusting air and fuel.
Claims20
An engine operating method, comprising:
- rotating an engine without combusting air and fuel in a direction reversed from a direction the engine rotates while combusting air and fuel via a controller;
- and
- adjusting operation of the engine in response to engine air flow less than a first threshold or greater than a second threshold while deactivating valves of one or more engine cylinders.
An engine operating method, comprising:
- rotating an engine in a direction responsive to a rotational direction of the engine that provides greater air flow through the engine at a predetermined engine speed, the engine with valves at a base valve timing.
An engine system, comprising:
- an engine including one or more cylinder valve deactivating mechanisms;
- an electric machine;
- and
- a controller including executable instructions stored in non-transitory memory to rotate the engine clockwise and counter clockwise, the engine rotated clockwise when the engine combusts air and fuel, the engine rotating counter clockwise when the engine is not combusting air and fuel and while one or more of the cylinder valve deactivating mechanisms is deactivating one or more cylinder valves.
1 more element
Dependencies are inferred from the claim text.