METHOD OF CALCULATING COMBUSTION RATE IN EXHAUST GAS HEATING DEVICE

摘要

By adding fuel to an exhaust gas passage (23a) and heating and igniting said fuel added to the exhaust passage, this method calculates the combustion rate RC of the fuel added in the exhaust gas passage when heating exhaust gas discharged from the engine (10). In this method, an exhaust gas temperature sensor (29) obtains the exhaust gas temperature To of exhaust gas flowing through the exhaust gas passage downstream of the region where the fuel added to the exhaust gas passage is combusted, the heat capacity CE of the exhaust gas is obtained, the energy amount QF of the fuel supplied to the exhaust gas passage is obtained, the exhaust gas temperature increase amount DeltaTo from immediately before the exhaust gas is heated is calculated, the exhaust gas temperature change rate dTo from immediately before the exhaust gas is heated is calculated, the parameter Z relating to exhaust gas flowing through the exhaust gas passage is obtained, and the combustion rate of the fuel added to the exhaust gas passage is calculated by RC=(CE/QF)(Z・dTo+DeltaTo).