Methods and systems for determining vehicle speed and barometric pressure
AssigneeFord Global Technologies, LLC
InventorsDouglas Martin, John Rollinger
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for utilization of vehicle speed and barometric pressure sensors. In one example, a method may include measuring a change in a barometric pressure resulting from a measured change in a vehicle speed, modeling the change in the barometric pressure based on a change in a ram-air pressure resulting from the change in the vehicle speed, and indicating a degraded barometric pressure measurement when a difference between the measured and the modeled change in the barometric pressure is greater than a threshold pressure difference.
Claims20
A method for a vehicle, comprising:
- measuring a change in a barometric pressure resulting from a measured change in a vehicle speed,
- modeling the change in the barometric pressure based on a change in a ram-air pressure resulting from the change in the vehicle speed, and
- indicating a degraded barometric pressure measurement when a difference between the measured and the modeled change in the barometric pressure is greater than a threshold pressure difference.
A vehicle system, comprising:
- a barometric pressure sensor, a vehicle speed sensor, and
- a controller, including executable instructions residing in non-transitory memory thereon to,
- measure a change in a barometric pressure with the barometric pressure sensor resulting from a change in a vehicle speed measured with the vehicle speed sensor,
- model the change in the barometric pressure based on a change in a ram-air pressure resulting from the change in the vehicle speed relative to an air velocity, and
- indicate one of a degraded barometric pressure sensor measurement and a degraded vehicle speed sensor measurement when a difference between the measured and the modeled change in the barometric pressure is greater than a threshold pressure difference.
A method for a vehicle, comprising:
- generating a model correlating a ram-air pressure to a vehicle speed,
- measuring a barometric pressure at a first vehicle speed, and
- determining the barometric pressure by subtracting the ram-air pressure corresponding to the first vehicle speed from the measured barometric pressure, wherein the ram-air pressure corresponding to the first vehicle speed is determined from the model.
Dependencies are inferred from the claim text.