Patent ID: 7100565
Filing Date: 2006-09-05
Classification: F02D,Y02T

Abstract:
1. An engine control system for controlling transitions between activated and deactivated modes in a displacement on demand engine, the control system comprising: an engine intake manifold sensor that generates, an intake manifold vacuum signal; an engine speed sensor that generates an engine speed signal; and a controller that calculates a reference pressure window based on said engine speed signal, that transitions the engine from the activated mode to the deactivated mode when said intake manifold vacuum signal is greater than an upper limit of said reference pressure window, and that transitions the engine from the deactivated mode to the activated mode when said intake manifold vacuum is lower than a lower limit of said reference pressure window, where the engine includes a first throttle in communication with a first set of cylinders and a second throttle in communication with a second set of cylinders, wherein transitioning the engine from the activated mode to the deactivated mode includes closing said first throttle to decrease the power output from the first set of cylinders and opening said second throttle to increase the power output from the second set of cylinders, wherein the total power output from the engine remains substantially constant during transitions between the activated and deactivated modes.