METHOD FOR DETERMINING THE FUEL-TO-AIR RATIO OF AN INTERNAL COMBUSTION ENGINE

摘要

It is the object of the invention to create a possibility to provide an absolute value of the fuel-to-air ratio independently of the operational readiness of lambda probes. According to the invention, this object is achieved in that different amounts of fuel are metered to successive working strokes of an internal combustion engine such that the speed curve of the camshaft or crankshaft of the internal combustion engine is excited and the speed curve is impressed with a characteristic pattern, wherein an absolute value of the fuel-to-air ratio is determined from said pattern.