Pressure/temperature calculation apparatus

摘要

In an internal combustion engine, at least one of the pressure and temperature in an intake passage (13) downstream of a throttle valve (18) is calculated 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, an amount of exhaust gas passing an exhaust gas flow control valve (22) and flowing into the intake passage, and an amount of gas flowing from the intake passage into a cylinder (5) 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, an amount of energy of the exhaust gas passing the exhaust gas flow control valve and flowing into the intake passage, and an amount of energy of the gas flowing from the intake passage into the cylinder of the engine.