F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
341/38.122
F02D 28/00 (2006.01) F02D 41/24 (2006.01) F02D 41/40 (2006.01) F02B 1/04 (2006.01) F02B 3/06 (2006.01) F02B 75/02 (2006.01)
Patent
CA 1167548
Engine Control System Abstract An electronic engine control system utilizing a digital microprocessor for controlling the timing mechanism and fuel pump rack limit to set the engine timing of, and maximum allowable rate of fuel delivery to, an interval combustion engine so that maximum engine performance is obtained with smoke and emissions limited to required EPA levels. A plurality of timing maps are provided for different modes of engine operation, each map having predetermined value timing control signals programmed therein corresponding to the optimal timing advance of a particular engine speed, or particular optimal timing advance of a particular engine speed, or particular combination of engine speed and position of the fuel rack. A timing map selector identifies the mode of engine operation and selects the appropriate timing map to control the timing mechanism by the particular programmed signal for the existing engine speed and fuel rack position. A similar map will output a particular programmed fuel/air signal in accordance with the existing engine speed and timing, the fuel/air signal having been predetermined to correspond to the maximum fuel/air ratio for fuel combustion to meet EPA limits for that engine speed and timing. The fuel/air signal is multiplied in accordance with existing manifold pressure and the resultant fuel delivery signal is used to set the rack limit for maximum allowable fuel delivery to the engine.
390114
Stevenson Thomas T.
Szentes John F.
Zenios Marios C.
Caterpillar Tractor Co.
Smart & Biggar
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