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US 8,998,774 B2Granted
Brake apply and release detection for stop/start vehicle
AssigneeFord Global Technologies, LLC
InventorsHai Yu, Mathew Alan Boesch, Ryan McGee
Life of this patent
Estimating the term…
Abstract
A vehicle is provided with an engine that is configured for automatic shutdown and restart. The vehicle is also provided with a controller that is configured to shutdown the engine in response to brake effort exceeding a first threshold and to restart the engine in response to brake effort decreasing below a second threshold. The first threshold and the second threshold are based on an estimated vehicle mass and a road gradient.
Claims16
A vehicle comprising:
- an engine;
- and
- a controller configured to shutdown the engine in response to brake pressure exceeding a first threshold and a rate of change of the brake pressure being greater than a rate of change threshold, and to restart the engine in response to brake pressure decreasing below a second threshold;
- wherein the first threshold and the second threshold are based on an estimated vehicle mass and a road gradient.
1 more element
A vehicle system comprising:
- a controller configured to:
- shutdown an engine in response to receiving a no propulsion request for longer than a time threshold and brake effort exceeding a first threshold, and
- restart the engine in response to brake effort being less than a second threshold, wherein the second threshold is greater than the first threshold.
A method for controlling automatic shutdown and restart of an engine, the method comprising:
- shutting down the engine in response to brake pressure exceeding a first threshold, wherein the first threshold is based on an estimated vehicle mass and a road gradient;
- and
- restarting the engine in response to brake pressure decreasing below a second threshold and the brake pressure decreasing at a rate of change that is less than a negative rate of change threshold for longer than a releasing time threshold.
Dependencies are inferred from the claim text.