METHOD FOR CORRECTING MEASUREMENT ERROR OF AIR FLOW RATE MEASURING DEVICE, AND MEASUREMENT ERROR CORRECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To precisely correct the error due to pulsation, and precisely execute the fuel control of an engine, by performing a correction according to the resonance frequency (engine resonance rotating speed) of an intake pipe caused by the change of intake air temperature. ;SOLUTION: When the fuel feed quantity is determined by use of a heat resistor type air flow rate measuring device as intake air flow rate detecting means, an excessive measurement error is caused when it is laid in a state accompanied with a reverse flow. When the correction quantity for solving this excessive error is calculated, intake air temperature is detected in addition to engine rotating speed and throttle valve opening, and a temperature condition is inputted to the rotating speed to calculate the value of engine rotating speed. A plurality of correction maps A-C in grids are formed by taking engine rotating speed and throttle opening as horizontal axis and vertical axis, respectively, and a correction quantity is inputted to each grid are prepared, and the correction maps A-C are selectively used according to the detected value of intake air temperature. Thus, the error due to pulsation of the air flow rate measuring device can be precisely corrected.;COPYRIGHT: (C)1998,JPO