| 摘要 |
<p>PURPOSE:To perform highly accurate EGR control continuously by correcting the electrical signal from O2 concentration detector with correspondence to the variation of electrical signal from an intake-air detector then correcting the opening of EGR valve with correspondence to said correction signal. CONSTITUTION:Under engine operation, an electronic controller 13 will determine the engine operating state on the basis of output signal from a rotation detector 12 to control EGR valve 11 with correspondence to the exhaust gas recirculation rate calculated in accordance with the operating state. O2 sensor 6 will detect O2 concentration in intake air mixed with exhaust gas while an intake-air detector 4 will detect the amount of intake-air. Then O2 concentration signal is corrected on the basis of intake-air detection signal to calculate the current exhaust gas recirculation rate with correspondence to the corrected O2 concentration signal and compare with said EGR rate then control the opening of EGR valve 11 such that they will be equalized.</p> |
