Patent ID: 6863048
Filing Date: 2005-03-08
Classification: F02D,Y02T

Abstract:
1. A method for generating vacuum in an intake manifold in a fuel-injected internal combustion engine in a vehicle, the engine having variable valve lift as a primary throttle means for regulating engine load and having an engine control module for controllably varying valve lift, comprising the steps of: a) providing a pressure sensor disposed in said intake manifold and connected to said engine control module for providing manifold pressure input to said engine control module; b) providing a secondary throttle means disposed at an inlet to said intake manifold, connected to and controlled by said engine control module; c) providing a vacuum capacitance tank connected to said intake manifold and an auxiliary vacuum activated system; d) inputting vehicle deceleration information into said engine control module; e) during said vehicle deceleration, at least partially closing said secondary throttle means to restrict the flow of air into said manifold and increasing the lift of said valves to pump air from said manifold through said engine, thereby generating manifold vacuum; and f) recharging said vacuum capacitance tank.