System and method for controlling engine restart operation to reduce resonance
First Claim
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1. A method for controlling an engine following an automatic engine shut-down request comprising:
- after starting to automatically stop the engine, in response to an operator change of mind to restart the engine,preventing restarting of the engine when a rotational speed of the engine is within a predetermined speed range in which resonance of an engine related component causing vibration of the engine related component occurs, andpreparing the engine for a restart while the engine is in the predetermined speed range by removing one or more auxiliary loads applied to the engine via disengagement of a clutch, the clutch coupling the one or more auxiliary loads with an engine output shaft when engaged.
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Abstract
A method and system for dealing with a change of mind event during an automatic shut-down of an engine 6 having a dual mass flywheel 8 is provided that reduces or eliminates the risk of excessive dual mass resonance during a restart of the engine 6 is disclosed.
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Citations
15 Claims
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1. A method for controlling an engine following an automatic engine shut-down request comprising:
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after starting to automatically stop the engine, in response to an operator change of mind to restart the engine, preventing restarting of the engine when a rotational speed of the engine is within a predetermined speed range in which resonance of an engine related component causing vibration of the engine related component occurs, and preparing the engine for a restart while the engine is in the predetermined speed range by removing one or more auxiliary loads applied to the engine via disengagement of a clutch, the clutch coupling the one or more auxiliary loads with an engine output shaft when engaged. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for controlling operation of an engine following an automatic engine shut-down request, comprising:
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an engine including an engine output shaft; an engine related component; a throttle valve; a clutch coupling the engine output shaft with one or more auxiliary loads when engaged; and an electronic control unit including instructions stored in a non-transitory medium to prevent restarting of the engine after an automatic engine shut-down request in response to an operator change of mind when a rotational speed of the engine is within a predetermined speed range in which resonance of the engine related component causing vibration of the engine related component occurs, prepare the engine for a restart while the rotational speed of the engine is in the predetermined speed range by removing the one or more auxiliary loads applied to the engine via disengagement of the clutch, and restart the engine using its own momentum with no starter motor assistance by enabling spark and fuel delivery when the rotational speed of the engine is less than the predetermined speed range and greater than a cranking limit. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for controlling an engine following an automatic engine shut-down request comprising:
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preventing restarting of an engine after starting to automatically stop the engine in response to an operator change of mind to restart the engine and when a rotational speed of the engine is within a predetermined speed range in which resonance of an engine related component causing vibration of the engine related component occurs; adjusting a throttle to a position based on engine speed in response to the operator change of mind while the rotational speed of the engine is within the predetermined speed range, where adjusting the throttle includes increasing an opening amount of the throttle as engine speed decreases; and preparing the engine for a restart while the engine is in the predetermined speed range by removing one or more auxiliary loads applied to the engine via disengagement of a clutch, the clutch coupling the one or more auxiliary loads with an engine output shaft when engaged. - View Dependent Claims (15)
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Specification