Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1994-03-23
1995-06-13
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123381, 73 5431, F02M 3704
Patent
active
054233020
ABSTRACT:
An apparatus and method for detecting the viscosity of actuating fluid used to actuate a hydraulically-actuated electronically-controlled injector is disclosed. In an internal combustion engine system including an engine having a crankshaft, a crankshaft angular speed sensor responsive to rotation of the crankshaft, a voltage sensor, and an engine coolant temperature sensor, which respectively generate angular speed, voltage, and temperature indicative signals, are provided. An electronic control module is provided with a memory means, the control module having an associated viscosity indicative signal or parameter whose magnitude is representative of the actuating fluid viscosity and is a function of the angular speed, and voltage indicative signals. The actuating fluid viscosity value is used by electronic control module to vary the actuating fluid pressure and vary a fuel delivery command signal pulsewidth and the timing of the application of the fuel delivery command signal relative to a predetermined crankshaft angular position to control the injection of fuel into engine via the injector independent of engine speed and load.
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Caterpillar Inc.
Keen Joseph W.
Miller Carl S.
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