Patent ID: 7533645
Filing Date: 2009-05-19
Classification: F02B,Y02T

Abstract:
1. An engine air intake control device, comprising: a variable length intake conduit movable from a first orientation wherein the intake conduit has a first length to a second orientation wherein the intake conduit has a second length, wherein the intake assembly moves from the first orientation to the second orientation when an engine speed of the engine reaches a threshold value; wherein the threshold value is set based on a determination that involves both a first engine output torque when the intake conduit is set to the first length and a second engine output torque when the intake conduit is set to the second length; wherein the variable length intake conduit comprises a fixed portion coupled to the engine, a movable portion positioned upstream from the fixed portion, and a conduit length varying mechanism that moves the movable portion along a generally linear path of movement toward and away from the fixed portion, wherein the movable portion is coupled to the fixed portion in the first orientation so that at least a part of the movable portion fits within and overlaps at least a part of the fixed portion along the path of movement, and the movable portion is separated from the fixed portion in the second orientation.