Patent ID: 6014961
Filing Date: 2000-01-18
Classification: F02M

Abstract:
A pressure sensing system for an internal combustion engine comprising:an intake manifold having an outer wall defining a plenum enclosed therein, with an air intake opening through the outer wall intersecting the plenum, a manifold pressure passage through the main wall intersecting the main plenum, a portion of a recirculation pressure passage extending through a portion of the outer wall, and a portion of a downstream recirculation passage extending through the outer wall;air throttling means for selectively restricting the air intake opening;an exhaust manifold having an outer wall defining an exhaust chamber enclosed therein, with an exhaust opening through the outer wall intersecting the exhaust chamber and a portion of an upstream recirculation passage extending through the outer wall;an exhaust gas recirculation valve assembly mounted to the intake manifold and the exhaust manifold including a second portion of the downstream recirculation passage aligned with the downstream recirculation passage of the intake manifold, a second portion of the upstream recirculation passage aligned with the upstream recirculation passage of the exhaust manifold, with a valve therebetween, and means for adjusting the valve;an orifice located in the downstream pressure passage for creating a restriction in the downstream passage;the recirculation pressure passage intersecting the downstream pressure passage between the orifice and the valve;a sensor housing mounted to the intake manifold;a first absolute pressure sensor mounted in the sensor housing operatively engaging the recirculation pressure passage;a second absolute pressure sensor mounted in the sensor housing, operatively engaging the manifold pressure passage;an electronic controller; andmeans for transmitting signals from the first and the second sensors to the controller.