Diagnostic devices non-uniform distribution of fuel and air mixture diagnostic methods uneven distribution of fuel-air mixture supplied to the cylinder of an internal combustion engine

摘要

There is a problem internal combustion engine (1), the fuel-air mixture is significantly affected by aging and manufacturing errors of the injection valve, and that generates a non-uniform distribution. To solve this problem, at the time of obtaining the non-uniform distribution individually for (2) each cylinder in accordance with the operation mode of the internal combustion engine, instability of the engine lambda value is detected or for each cylinder in the present invention errors cylinder of the if the value a limit value of the operation is determined and set for the internal combustion engine and a value determined individually for each cylinder are compared, obtained exceeds a limit value and is input to the error memory (9).