초록 ▼

In an automotive vehicle powered by an internal combustion engine, an EGR flow path includes an exhaust emission control valve between an exhaust system of the engine and an intake system of the engine. The valve is operated by an actuator having a body mounted on the emission control valve body and

In an automotive vehicle powered by an internal combustion engine, an EGR flow path includes an exhaust emission control valve between an exhaust system of the engine and an intake system of the engine. The valve is operated by an actuator having a body mounted on the emission control valve body and a shaft for operating the valve to selectively restrict the flow path. The shaft is operated by a movable actuator wall of the actuator bounding a portion of a variable volume chamber space to which regulated vacuum from an electric vacuum regulator (EVR) valve is communicated to position the movable actuator wall. An internal pressure sensing passage, which includes a tube that also functions as the shaft communicates pressure at a location in the flow path to a pressure sensor. The tube communicates the flow path to a chamber space separated from the variable volume chamber space by a separator wall, and a port of the pressure sensor communicates with the chamber space of the sensing passage. The pressure sensor and the EVR valve are integrated with the body of the fluid pressure actuator. A single electric connector connects the pressure sensor and the EVR valve with external circuitry.

대표청구항 ▼

[ What is claimed is:] [1.] An automotive vehicle that is powered by an internal combustion engine which has an exhaust emission control system and comprises:an EGR flow path between an exhaust system of the engine and an intake system of the engine, a valve for selectively restricting the EGR flow

[ What is claimed is:] [1.] An automotive vehicle that is powered by an internal combustion engine which has an exhaust emission control system and comprises:an EGR flow path between an exhaust system of the engine and an intake system of the engine, a valve for selectively restricting the EGR flow path, an actuator comprising an actuator mechanism for operating the valve, a pressure sensor that provides a signal related to pressure communicated to the pressure sensor, and a pressure sensing passage communicating pressure to the pressure sensor from a location in the flow path, the pressure sensing passage including a variable volume chamber space which is external to the actuator mechanism, and the volume of which varies with the operation of the valve by the actuator mechanism.