| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately estimate the temperatures of exhaust system parts according to a fuel injection system without using a temperature sensor in an internal combustion engine switchable between an intake pipe injection and a cylinder injection. <P>SOLUTION: For each of the intake pipe injection and the cylinder injection, a converging temperature map specifying a relation between engine operating conditions (such as engine speed, and intake air volume or fuel injection volume) and the converging temperature of the exhaust system parts is stored in the ROM of an ECU, and during the operation of the engine, the converging temperature map according to a present fuel injection system stored in the ROM is retrieved to provide the converging temperatures of the exhaust parts according to the present fuel injection system and the engine operating conditions (steps 101 to 103). After that, the converging temperatures are filter-treated (annealing treatment, primary delay treatment) with a temperature variation time constant according to the operating conditions of the engine to provide the estimated temperatures of the exhaust system parts (steps 104 and 105). <P>COPYRIGHT: (C)2006,JPO&NCIPI |
