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US 8,893,665 B2Granted
Method and system for compensating for alcohol concentration in fuel
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, Stephen B. Smith, Rohit Arvind Zope, Brandon M. Dawson
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Abstract
An engine system for determining an alcohol concentration in fuel is disclosed. In one example, engine throttle position, fuel pulse width, and air-fuel ratio form a basis for determining alcohol concentration of a fuel combusted in an engine. The system and its related method may improve engine operation in conjunction with detecting an alcohol concentration of a fuel.
Claims20
An engine system, comprising:
- an engine;
- a first actuator coupled to the engine;
- a second actuator coupled to the engine;
- an exhaust gas oxygen sensor located in an exhaust passage of the engine;
- and
- a controller including instructions to adjust the first or second actuator in response to an alcohol concentration of a fuel combusted by the engine, the alcohol concentration based on the first actuator, the exhaust gas oxygen sensor, and a speed of the engine.
3 more elements
A method for operating an engine, comprising:
- adjusting an engine actuator in response to an alcohol concentration of a fuel combusted by the engine, the alcohol concentration based at least on a position of a throttle, an output of an exhaust gas oxygen sensor, engine speed, and a fuel injector pulse width.
A method for operating an engine, comprising:
- operating an engine during conditions where engine speed and load are varying by less than predetermined amounts;
- adjusting fuel adaptation by less than a threshold amount;
- and
- adjusting an engine actuator in response to an alcohol concentration of a fuel combusted by the engine, the alcohol concentration based on a position of a throttle, an output of an exhaust gas oxygen sensor, engine speed, and a fuel pulse width.
1 more element
Dependencies are inferred from the claim text.