Patent ID: 6879904
Filing Date: 2005-04-12
Classification: F02D,G01F,G01K,Y02T

Abstract:
1. A pressure/temperature calculation apparatus of an internal combustion engine in which an exhaust passage is connected to an intake passage downstream of a throttle valve via an exhaust gas recirculation passage, and an exhaust gas flow control valve adapted to control a flow rate of exhaust gas flowing in the exhaust gas recirculation passage is disposed in the exhaust gas recirculation passage, comprising: a controller that calculates at least one of a pressure and a temperature in the intake passage downstream of the throttle valve, according to numerical calculations using an expression of a relationship established based on the law of conservation of mass among an amount of air passing the throttle valve and flowing into the intake passage downstream of the throttle valve, an amount of exhaust gas passing the exhaust gas flow control valve and flowing into the intake passage downstream of the throttle valve, and an amount of gas flowing from the intake passage downstream of the throttle valve into a cylinder of the engine, and an expression of a relationship established based on the law of conservation of energy among an amount of energy of the air passing the throttle valve and flowing into the intake passage downstream of the throttle valve, an amount of energy of the exhaust gas passing the exhaust gas flow control valve and flowing into the intake passage downstream of the throttle valve, and an amount of energy of the gas flowing from the intake passage downstream of the throttle valve into the cylinder of the engine.