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US 11,377,093 B2Granted
Methods and systems for exhaust tuning valve diagnostics
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for diagnostics of an exhaust tuning valve during vehicle-off conditions. In one example, the engine may be reverse rotated, unfueled while the position of the exhaust is varied and an intake air flow is estimated at each position of the exhaust tuning valve. The exhaust tuning valve may be diagnosed based on a change in air flow with the variation in the position of the exhaust tuning valve.
Claims20
A hybrid vehicle system, comprising:
- a vehicle including an engine;
- a mass air flow (MAF) sensor positioned in an intake manifold of the engine;
- an exhaust tuning valve coupled across a muffler positioned in an exhaust passage downstream of a particulate filter;
- and
- a controller with computer readable instructions stored on non-transitory memory that when executed enable the controller to:
- during a first engine operating condition, adjust a position of the exhaust tuning valve based on an operator selected noise mode;
- during a second engine operating condition,
- adjust an opening of the exhaust tuning valve from a completely closed position to a completely open position;
- estimate an intake air flow corresponding to the opening of the exhaust tuning valve via the MAF sensor;
- and
- diagnose the exhaust tuning valve based on a change in the intake airflow with an increase in the opening of the exhaust tuning valve.
8 more elements
A hybrid vehicle system, comprising:
- an engine and an electric motor;
- an exhaust tuning valve coupled across a muffler positioned in an exhaust passage;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- adjust a position of the exhaust tuning valve during an unfueled cranking of the engine while the engine is spun in reverse to diagnose the exhaust tuning valve based on an intake air flow at one or more positions of the exhaust tuning valve.
2 more elements
A hybrid vehicle system, comprising:
- a vehicle including an engine;
- a mass air flow (MAF) sensor positioned in an intake manifold of the engine;
- an exhaust tuning valve coupled across a muffler positioned in an exhaust passage downstream of a particulate filter;
- and
- a controller with computer readable instructions stored on non-transitory memory that when executed enable the controller to:
- during a first engine operating condition, adjust a position of the exhaust tuning valve based on an operator selected noise mode, wherein the first engine operating condition comprises the engine being rotated in a forward direction with fuel being injected via fuel injectors, and the electric booster being rotated in a forward direction based on torque demand;
- during a second engine operating condition,
- adjust an opening of the exhaust tuning valve from a completely closed position to a completely open position;
- estimate an intake air flow corresponding to an opening of the exhaust tuning valve via the MAF sensor;
- and
- diagnose the exhaust tuning valve based on a change in the intake airflow with an increase in the opening of the exhaust tuning valve via rotating the engine in a reverse direction via an electric machine.
8 more elements
Dependencies are inferred from the claim text.