Patent ID: 8056337
Filing Date: 2011-11-15
Classification: F01N,F02B,Y02T

Abstract:
1. An internal combustion engine comprising: two cylinder groups in which a plurality of cylinders are arranged divided into two banks; an intake passage provided for the cylinder groups; an exhaust passage provided separately for each cylinder group; an exhaust gas control valve that is provided in each exhaust passage and adjusts a flowrate of exhaust gas; a control catalyst provided in at least one of the exhaust passages; a communicating passage that provides communication between the exhaust passages upstream of the control valves and the control catalyst; a communication control valve that is provided in the communicating passage and adjusts the flowrate of the exhaust gas; a supercharger provided upstream of the control catalyst in one of the exhaust passages of the two cylinder groups; and a control portion that selectively opens and closes and communication control valve according to an operating state of the internal combustion engine, wherein the control portion opens the communication control valve when the internal combustion engine is operating at a high load, and an exhaust gas pressure upstream of a turbine of the supercharger is greater than a boost pressure downstream of a compressor of the supercharger.