Inferred oil responsiveness using pressure sensor pulses

Details Inferred oil responsiveness using pressure sensor pulses Inferred oil responsiveness using pressure sensor pulses

2009-09-17

2011-12-20

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150

Reexamination Certificate

active

08079335

ABSTRACT:
A system and method for controlling an internal combustion engine include determining oil responsiveness based on pressure variations associated with oil pump pulses in response to a stimulus, and controlling the engine based on the determined oil responsiveness. The stimulus may be a change in oil temperature, engine speed, or commanded pump pressure, for example. The system and method may also use the rate of change of mean oil pressure to determine the oil responsiveness or measure of oil viscosity. Oil responsiveness may be used to control hydraulic actuators, such as variable cam timing devices, or valve deactivation devices.

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Abstract of JP 2008065423A listed above, Mar. 2008.
T. Han, et al., Engine Oil Viscometer Based on Oil Pressure Sensor, SAE Technical Paper Series, 2006-01-0701, ISSN 0148-7191 .

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