ENGINE SYSTEM AND CONTROLLER, CONTROL SYSTEM AND CONTROL METHOD FOR ENGINE SYSTEM

摘要

A controller for an engine system includes an exhaust-driven turbocharger including a compressor and a turbine, an exhaust gas recirculation unit configured to recirculate exhaust gas from a downstream portion of the turbine in an exhaust gas passage to an upstream portion of the compressor in an intake gas passage, and a cooling unit configured to cool the turbine, the controller includes an electronic control unit. The electronic control unit is configured to set a degree of cooling of the turbine based on a predetermined condition in which a gas temperature at an outlet portion of the compressor is higher than a predetermined temperature and the recirculating of exhaust gas is performed, and set a higher degree of cooling of the turbine when the predetermined condition is satisfied compared to a degree of cooling of the turbine when the predetermined condition is not satisfied.

主权项

1. A controller for an engine system, the engine system including
an exhaust-driven turbocharger including a compressor and a turbine, the compressor disposed in an intake gas passage of an internal combustion engine and the turbine disposed in an exhaust gas passage of the internal combustion engine, an exhaust gas recirculation unit configured to recirculate exhaust gas from a downstream portion of the turbine in the exhaust gas passage to an upstream portion of the compressor in the intake gas passage, and a cooling system configured to cool the turbine by circulating a coolant in a coolant passage disposed in the turbine, the controller comprising:
an electronic control unit configured to set a degree of cooling of the turbine by the cooling system based on a predetermined condition, the predetermined condition being a condition that a gas temperature at an outlet portion of the compressor is higher than a predetermined temperature and a recirculating of exhaust gas is performed by the exhaust gas recirculation unit, andthe electronic control unit configured to set a higher degree of cooling of the turbine when the predetermined condition is satisfied compared to a degree of cooling of the turbine when the predetermined condition is not satisfied.