US 7,520,259 B2
Power management system for fuel injected engine
Travis E. Barnes, Metamora, Ill. (US); Stephen R. Lewis, Chillicothe, Ill. (US); W. John Love, Dunlap, Ill. (US); Timothy J. Matzke, El Paso, Ill. (US); and Kevin L. Dea, Washington, Ill. (US)
Assigned to Caterpillar Inc., Peoria, Ill. (US)
Filed on May 31, 2006, as Appl. No. 11/443,100.
Prior Publication US 2007/0277777 A1, Dec. 06, 2007
Int. Cl. F02B 3/00 (2006.01); G06F 17/00 (2006.01)
U.S. Cl. 123—299  [123/478; 123/480; 701/104] 22 Claims
OG exemplary drawing
 
1. A power system, comprising:
an engine block forming at least one combustion chamber;
a crankshaft rotationally disposed within the engine block;
an engine valve operatively connected to the crankshaft to cyclically open and close a fluid passageway;
a variable valve actuation device configured to selectively interrupt the cyclical opening and closing movement of the engine valve;
a fuel injector operable to inject multiple shots of fuel into the at least one combustion chamber during a single injection event;
a sensor configured to sense a rotational speed of the power system and generate a signal indicative of the sensed speed; and
a controller in communication with the sensor, the fuel injector,and variable valve actuation device, the controller being configured to:
limit the number of shots per injection event in response to the signal; and
reduce power supplied to the variable valve actuation device in response to a power available to the controller, the fuel injector, and the variable valve actuation device falling below a predetermined value.