| 摘要 |
An electronic engine controller operates to control the phase angle of a variable position camshaft. The engine controller 10 receives signals indicative of engine coolant temperature 63, aircharge temperature 55, throttle position 53, engine speed 19 and camshaft position 18, and generates a camshaft position signal to a variable camshaft control actuator 40 to alter the phase angle of the camshaft with respect to the engine crankshaft. The engine controller 10 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 10 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. <IMAGE> |
