Method of determining rubbing friction torque in a motor...

Details Method of determining rubbing friction torque in a motor... Method of determining rubbing friction torque in a motor...

2005-04-05

2005-04-05

McCall, Eric S. (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

Reexamination Certificate

active

06874360

ABSTRACT:
A method of determining the rubbing friction torque involves characterizing fuel cutoff engine deceleration, and calculating the rubbing friction torque for any combination of engine speed and powertrain temperature is calculated in accordance with a base point rubbing friction torque RFTbasedetermined at a base powertrain temperature Tbaseand fuel cutoff characterization data. The calibration data characterizing fuel cutoff engine deceleration is obtained by alternately enabling and cutting off engine fuel delivery to cycle the engine speed between specified set points, and measuring and recording the engine deceleration during intervals of fuel cutoff. The rubbing friction torque RFTtestat a given test temperature Ttestis calculated according toR⁢ ⁢F⁢ ⁢Trest=(R⁢ ⁢F⁢ ⁢Tbase+P⁢ ⁢F⁢ ⁢Tbase)×D⁢ ⁢E⁢ ⁢C⁢ ⁢E⁢ ⁢LtestD⁢ ⁢E⁢ ⁢C⁢ ⁢E⁢ ⁢Lbase-P⁢ ⁢F⁢ ⁢Ttest,where DECELtestand DECELbaseare the fuel cutoff engine decelerations at the test and base points, respectively, and PFTtest, and PFTbaseare the pumping friction torques at the test and base points, respectively.

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