Control device of engine with supercharger

摘要

An engine with a supercharger includes a low pressure loop EGR apparatus. An EGR passage having an inlet connected to an exhaust passage downstream of a turbine and an outlet connected to an intake passage upstream of a compressor. An intake bypass passage is provided to bypass the intake passage downstream of the compressor and the intake passage upstream of the compressor, with an ABV in the intake bypass passage. A throttle valve is closed during stop or deceleration operation of the engine. An electronic control unit (ECU) is configured such that, when the ECU determines based on an operation state of the engine that the EGR valve is in a valve-opened state and the engine is in deceleration operation from a supercharging region, the ECU controls an EGR valve to close and the ABV to open from a valve-closed state delayed from start of closing the EGR valve.

主权项

1. A control device of an engine with a supercharger, the engine including:
the supercharger provided between an intake passage and an exhaust passage of the engine and configured to increase intake pressure in the intake passage, the supercharger including a compressor placed in the intake passage, a turbine placed in the exhaust passage, and a rotary shaft connecting the compressor and the turbine so that the compressor and the turbine are integrally rotatable; an exhaust gas recirculation apparatus including an exhaust recirculation passage configured to allow part of exhaust gas discharged from a combustion chamber of the engine to the exhaust passage to flow as exhaust recirculation gas to the intake passage and return to the combustion chamber and an exhaust recirculation valve configured to regulate a flow of the exhaust recirculation gas in the exhaust recirculation passage, the exhaust recirculation passage having an inlet connected to the exhaust passage downstream of the turbine and an outlet connected to the intake passage upstream of the compressor; an intake regulating valve configured to regulate intake amount in the intake passage; an intake bypass passage configured to bypass the intake passage downstream of the compressor and the intake passage upstream of the compressor; an air bypass valve configured to open and close the intake bypass passage; an operating condition detecting unit configured to detect operating condition of the engine; and a control unit configured to control at least the exhaust recirculation valve and the air bypass valve based on the detected operating condition; the intake regulating valve being configured to open during acceleration operation or during steady operation of the engine and to close during stop operation or during deceleration operation of the engine, wherein the control unit is configured such that, when the control unit determines based on the detected operating condition that the exhaust recirculation valve is in a valve-opened state and that the engine is in the deceleration operation from a supercharging region where the supercharger is operated, the control unit controls the exhaust recirculation valve to close and controls the air bypass valve to open from a closed state with a delay from start of closing the exhaust recirculation valve.