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US 2015/0307101 A1Published application
Vehicle and method to control rolling engagements
AssigneeFord Global Technologies, LLC
InventorsSCOTT PATRICK RIES, KENDRICK MORRISON
Life of this patent
Estimating the term…
Abstract
When a vehicle driver commands a change in direction of motion while the vehicle is moving above a threshold speed, a controller first applies a braking force to slow the vehicle below the threshold speed and then establishes a power flow path associated with the opposite direction of motion. The braking force may be applied by wheel brakes or, in some situations, by a transmission clutch. This method prevents an engine stall, overheating of oncoming clutch, and excessive delay.
Claims14
A vehicle comprising:
- a transmission configured to selectively establish a plurality of power flow paths;
- a braking system configured to slow the vehicle in response to a driver command;
- and
- a controller programmed to respond to movement of a shift lever while the vehicle is moving in a current direction by commanding the braking system to slow the vehicle before commanding the transmission to establish a power flow path corresponding to an opposite direction.
1 more element
A method of controlling a vehicle comprising:
- responding to a change of position of a shift lever from a first position corresponding to a current direction of motion to a second position corresponding to an opposite direction of motion by applying a first element to slow the vehicle and then, after a vehicle speed decreases to a threshold, engaging a second element to establish a power flow path associated with the second position.
A controller comprising:
- input communications channels configured to receive a signal from a shift lever;
- output communications channels configured to send command signals to a transmission;
- and
- control logic programmed to respond to movement of the shift lever from a position corresponding to a current direction of vehicle movement to a position corresponding to an opposite direction of vehicle movement by commanding a braking system to reduce vehicle speed and then, when vehicle speed is less than a threshold, commanding the transmission to establish a power flow path corresponding to the opposite direction of vehicle movement.
1 more element
Dependencies are inferred from the claim text.