How to increase exhaust gas purification efficiency of automobile

摘要

The present invention relates to exhaust gas reduction of a six-cylinder engine, and calculates a difference between signals fed back from oxygen sensors of odd-numbered cylinders (1, 3, 5) and even-numbered cylinders (2, 4, 6), respectively. If is higher than the set value, it is determined that the abnormality is occurred and feedback correction of the signals of the two oxygen sensors to the average value is performed to compare whether the oxygen sensor feedback control is activated to increase the purification efficiency of exhaust gas and improve fuel efficiency. Determining the first step; A second step of reading a signal of each oxygen sensor and comparing the error if it is determined that the feedback control is possible in the first step; A third step of calculating signals of two oxygen sensors as an average value when the error is determined to be equal to or greater than a set value in the second step; And a fourth step of using the signal of the oxygen sensor output as the average value in the third step for feedback correction.