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US 7,803,087 B2Granted
System and method for controlling a vehicle
AssigneeFord Global Technologies, LLC
InventorsShunsuke Okubo, Matthew Smith, Benjamin Thorsen
Life of this patent
Estimating the term…
Abstract
The embodiments described herein include a control system and method for a vehicle. In one embodiment, the control system is able to determine the occurrence of NVH anomalies due to gear lash and control the operation of various vehicle devices to reduce the effects of gear lash. If such NVH anomalies are foreseen, a predetermined torque is applied to the vehicle wheels for a predetermined time period. Subsequently, the applied torque is gradually increased until a creep torque is reached.
Claims20
A system comprising:
- a controller operable with a gear set to:
- generate signals for an application of a predetermined torque to the gear set for a fixed predetermined time period upon determining that the gear set is transitioning between a first shift position and a second shift position, and
- generate signals for an increase in torque applied to the gear set in an amount greater than the predetermined torque until a creep torque is reached.
A method comprising:
- generating signals for an application of a predetermined torque to a gear set for a fixed predetermined time period upon determining that the gear set is transitioning between a first shift position and a second shift position;
- and
- generating signals for an increase in torque applied to the gear set in an amount greater than the predetermined torque until a creep torque is reached.
A method comprising:
- applying a predetermined torque in an amount sufficient to overcome static friction in a vehicle powertrain for a fixed predetermined time period to a gear set through the use of a motor coupled to the gear set when a transition between a reverse shift position and a drive shift position is occurring;
- and
- increasing the torque applied to the gear set in an amount greater than the predetermined torque up to a creep torque within a predetermined ramp period after the predetermined time period has passed.
Dependencies are inferred from the claim text.