Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1996-05-15
1997-03-11
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9017, F01L 134, F01L 1300
Patent
active
056091265
ABSTRACT:
An electronic engine controller operates to control the phase angle of a variable position camshaft. The engine controller receives signals indicative of engine coolant temperature, aircharge temperature, throttle position, engine speed and camshaft position, and generates a camshaft position signal to a variable camshaft control actuator to alter the phase angle of the camshaft with respect to the engine crankshaft. The engine controller contains two tables which contain cam phase angles. The first table contains a plurality of values indexed by engine speed and engine aircharge and the second table contains a plurality of values indexed by engine speed and throttle position. The engine controller generates the camshaft position signal in one of three manners depending on the mode of engine operation. In a first mode of engine operation the camshaft position signal is generated as a function of engine coolant temperature and aircharge temperature. In a second mode of engine operation, the camshaft position signal is generated as a function of the values contained in the aforesaid first and second tables, and in a third mode of engine operation the camshaft position signal is generated as a function of a predetermined default value.
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Clinton Eric L.
Cullen Michael J.
Dona Alan R.
Hardy Larry A.
Ford Motor Company
Lo Weilun
May Roger L.
Melotik Lorraine S.
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