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US 2021/0262401 A1Published application
Methods and system for reducing engine hydrocarbon emissions
AssigneeFord Global Technologies, LLC
InventorsLeon Hu, James Yi
Life of this patent
Estimating the term…
Abstract
A method for operating an engine that includes a turbocharger with a wastegate is described. In one example, the method includes oscillating a position of the wastegate during cold engine starting as a function of a speed of an engine. The wastegate position may be adjusted to follow a square wave, sinusoidal wave, or triangle wave.
Claims20
An engine operating method, comprising:
- oscillating a position of a turbocharger wastegate at a predetermined rate in response to a cold engine start via a controller.
An engine system, comprising:
- an engine including a turbocharger, the turbocharger including a wastegate;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to adjust a position of the wastegate at a predetermined frequency when a temperature is less than a threshold temperature, where the predetermined frequency is a function of engine speed.
(canceled)
An engine operating method, comprising:
- via a controller, adjusting a position of a turbocharger wastegate at a predetermined rate in response to a temperature being less than a threshold temperature, where adjusting the position of the turbocharger wastegate includes adjusting an amplitude of the position of the turbocharger wastegate as a function of engine air mass.
Dependencies are inferred from the claim text.