| 摘要 |
PURPOSE: A back pressure controlling device and method of an engine are provided to automatically control the flow and the back pressure of exhaust gas according to the driven status of a vehicle and the driving condition of the engine. CONSTITUTION: An exhaust pipe(300) guides exhaust gas from an engine(370) to the outside. An isolating plate(310) forms a variable exhaust passage(360) by installing inside the exhaust pipe. A back pressure control valve(320) is installed in the variable exhaust passage. A sensor unit(330) detects the driving condition of the engine. An ECU(Electronic Control Unit)(340) outputs a back pressure control signal if the operated driving condition is a back pressure control condition by analyzing signals from the sensor unit. A back pressure control actuator(350) opens and shuts the back pressure control valve according to the back pressure control signal from the ECU.
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