Internal viscous damper monitoring system and method
First Claim
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1. A method for operating an internal combustion engine of a vehicle traveling on the road, the method comprising:
- damping engine vibration with a damper coupled to the engine; and
when said damping is reduced, preventing engine speed from rising above a threshold value, during a first engine or transmission state, to reduce degradation of the engine that would otherwise occur, and permitting engine speed to rise above the threshold during a second engine or transmission state.
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Abstract
A method for operating an internal combustion engine of a vehicle traveling on the road, the method comprising of damping engine vibration with a damper coupled to the engine, and when said damping is reduced, preventing engine speed from falling below a threshold value, at least under selected operating conditions, to reduce degradation of the engine that would otherwise occur.
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Citations
20 Claims
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1. A method for operating an internal combustion engine of a vehicle traveling on the road, the method comprising:
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damping engine vibration with a damper coupled to the engine; and when said damping is reduced, preventing engine speed from rising above a threshold value, during a first engine or transmission state, to reduce degradation of the engine that would otherwise occur, and permitting engine speed to rise above the threshold during a second engine or transmission state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for an engine, comprising:
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an internal viscous damper coupled to a crankshaft at a front end of the engine, the damper having a fluid located therein having a viscosity selected to reduce engine speed oscillations; and a controller configured to maintain engine speed below a threshold value, at least under selected operating conditions based on a transmission state, when viscosity of a fluid in said damper is reduced, where said threshold value is reduced when said viscosity is reduced. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for operating an internal combustion engine of a vehicle traveling on the road, the method comprising:
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damping engine vibration with a damper coupled to the engine; when said damping is reduced, maintaining engine speed below a threshold value, at least under selected operating conditions based on a transmission state, to reduce degradation of the engine that would otherwise occur; and setting a diagnostic code indicating degradation of said damper.
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Specification