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US 9,517,774 B2Granted
Static road gradient estimation
AssigneeFord Global Technologies, LLC
InventorHai Yu
Life of this patent
Estimating the term…
Abstract
A vehicle and a vehicle system are provided with a controller that is configured to generate output indicative of a static road gradient estimation based on a filtered longitudinal acceleration. The filtered longitudinal acceleration is dependent upon a derivative of a longitudinal acceleration. An initial value of the static road gradient estimation corresponds to at least one of a kinematic road gradient estimation and a dynamic road gradient estimation.
Claims19
A vehicle comprising:
- an engine configured for automatic shutdown and restart;
- a controller configured to
- filter a longitudinal acceleration using a low pass filter having a bandwidth selected from a plurality of bandwidths based on a derivative of the longitudinal acceleration,
- generate output indicative of a static road gradient estimation based on the filtered longitudinal acceleration,
- wherein the controller is further configured to shutdown and restart the engine based on the static road gradient estimation;
- wherein an initial value of the static road gradient estimation corresponds to at least one of a kinematic road gradient estimation and a dynamic road gradient estimation.
3 more elements
A vehicle system comprising:
- a controller configured to:
- filter a longitudinal acceleration using a low pass filter having a bandwidth selected from a plurality of bandwidths based on a derivative of the longitudinal acceleration corresponding to a longitudinal jerk,
- generate output indicative of a static road gradient estimation based on the filtered longitudinal acceleration, and
- generate output indicative of a static quality factor based on the longitudinal jerk.
1 more element
A method for estimating a static road gradient comprising:
- filtering input indicative of a longitudinal acceleration using a low pass filter having a bandwidth selected from a plurality of bandwidths based on a derivative of the longitudinal acceleration;
- generating output indicative of a static road gradient estimation based on the filtered longitudinal acceleration;
- and
- generating output indicative of a static quality factor based on the derivative.
1 more element
Dependencies are inferred from the claim text.