Method of estimating engine cooling fan power losses

Details Method of estimating engine cooling fan power losses Method of estimating engine cooling fan power losses

2005-06-07

2005-06-07

Kwon, John T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C701S114000

Reexamination Certificate

active

06904352

ABSTRACT:
A method for estimating engine torque loss due to a fan. A table of maximum fan torque losses is compiled at a plurality of engine speeds. An engine control unit (ECU) is configured with the table of maximum fan torque losses. A first maximum fan torque loss and a second maximum fan torque loss for an engine speed are retrieved from the table. A maximum fan torque loss for the engine speed is estimated by interpolating between the first maximum fan torque loss and the second maximum fan torque loss. An engine torque loss estimate is calculated by adjusting the maximum fan torque loss based on a set of predetermined fan characteristics.

REFERENCES:
patent: 5780731 (1998-07-01), Matsui et al.
patent: 6584391 (2003-06-01), Lack
patent: 6654678 (2003-11-01), Rodriguez
patent: 2002/0062183 (2002-05-01), Yamaguchi et al.
patent: 2002/0166330 (2002-11-01), Matsubara et al.
patent: 2003/0017911 (2003-01-01), Lack

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