Torque estimation method for an internal combustion engine
AssigneeFord Global Technologies, LLC
InventorMichael John Cullen
Life of this patent
Estimating the term…
Abstract
A method is presented for correcting estimates of engine output torque and accessory load torque. Engine output torque estimates are corrected when the accessory is disengaged from the engine. Accessory load torque is learned, or corrected, when the accessory is engaged to the engine. In one example, these corrections are made when engine output torque is known to be substantially zero from torque converter speed ratio or from the timing of the overrunning clutch engagement. This information is then used to control engine output torque to improve drive feel and vehicle performance.
Claims20
An accessory load torque estimation method for use with an engine having an accessory, the method comprising:
- learning engine torque based on an engine operating condition when engine torque is less than a predetermined value and the accessory is disengaged;
- and
- estimating a load torque of the accessory based on said operating condition and said learned engine torque when said engine torque is less than said predetermined value and the accessory is engaged.
An accessory load torque estimation method for use with an internal combustion engine having a torque converter and an accessory, the method comprising:
- learning residual engine torque based on an engine operating condition when a speed ratio across the torque converter is within a predetermined range and the accessory is disengaged;
- estimating a load torque of the accessory based on said operating conditions and said residual engine torque when said speed ratio is within said predetermined range and the accessory is engaged;
- and
- controlling the engine in response to said learned residual torque and said estimated load torque of the accessory.
An article of manufacture comprising a computer storage medium having a computer program encoded therein for use with an internal combustion engine having a torque converter and an accessory, said computer storage medium comprising:
- code for learning residual engine torque based on an engine operating condition when a speed ratio across said torque converter is within a predetermined range and said accessory is disengaged;
- code for estimating a load torque of said accessory based on said operating conditions and said residual engine torque when said speed ratio is within said predetermined range and said accessory is engaged;
- and
- code for controlling said engine in response to said estimated load torque.
Dependencies are inferred from the claim text.