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US 11,846,240 B2Granted
Engine idle speed control
AssigneeFord Global Technologies, LLC
InventorsMichael Shelby, Thomas Leone, Christopher Cundy
Life of this patent
Estimating the term…
Abstract
A method and a system for adjusting a base idle speed of an engine are described. In one example, the method reduces engine speed according to output of a sensor that senses mechanical vibrations. Once a vibration level exceeds a threshold, engine speed reduction ceases and the base engine idle speed is adjusted according to a present engine speed.
Claims20
A method for operating an engine, comprising:
- adjusting a base idle speed of the engine in response to an operating state of an active noise cancellation system, where adjusting the base idle speed includes:
- progressively reducing a speed of the engine and receiving an output of a vibration sensor or a sound sensor via a controller until the output of the vibration sensor or the sound sensor increases to a first threshold level;
- and
- adjusting the base idle speed of the engine to the speed of the engine where the output of the vibration sensor or the sound sensor is substantially equal to the first threshold level.
1 more element
A system, comprising:
- an engine;
- an active noise cancellation system including a microphone;
- and
- a controller including executable instructions stored in non-transitory memory that when executed cause the controller to:
- in response to an operating state of the active noise cancellation system, progressively reduce an idle speed of the engine and receive an output of the microphone until the output of the microphone increases to a first threshold level.
2 more elements
A method for operating an engine, comprising:
- in response to an active noise cancellation request, measuring audible sounds via a first microphone via a controller;
- in response to an absence of the active noise cancellation request, measuring audible sounds via the first microphone via the controller;
- in response to a sound pressure level determined by the first microphone exceeding a second threshold level in the absence of the active noise cancellation request, not adjusting an engine idle speed;
- in response to the sound pressure level determined by the first microphone not exceeding the second threshold level in the absence of the active noise cancellation request, adjusting the engine idle speed;
- and
- in response to the sound pressure level determined by a second microphone being less than a first threshold level in a presence of the active noise cancellation request, adjusting the engine idle speed, where adjusting the engine idle speed includes:
- progressively reducing a speed of the engine via the controller while receiving a bandpass filtered output of a first sensor and a bandpass filtered output of a second sensor until the bandpass filtered output of the first sensor is greater than a first threshold or the bandpass filtered output of the second sensor is greater than a third threshold.
4 more elements
Dependencies are inferred from the claim text.