发明名称 |
Air-fuel ratio control system for internal combustion engine |
摘要 |
An oscillation signal is generated to oscillate the air-fuel ratio with a set frequency which is different from a 0.5th-order frequency (half of the frequency corresponding to a rotational speed of the engine). Air-fuel ratio perturbation control is performed to oscillate the air-fuel ratio according to the oscillation signal. An intensity of the 0.5th-order frequency component and the set frequency component contained in the detected air-fuel ratio signal are calculated. A determination parameter applied to determining an imbalance degree of air-fuel ratios corresponding to the plurality of cylinders is calculated according to the two intensities and determines an imbalance failure that the imbalance degree of the air-fuel ratios exceeds an acceptable limit. A predicted imbalance value, indicative of a predicted value of the imbalance degree, is calculated, and an amplitude of the oscillation signal is set according to the predicted imbalance value. |
申请公布号 |
US8726637(B2) |
申请公布日期 |
2014.05.20 |
申请号 |
US201213565291 |
申请日期 |
2012.08.02 |
申请人 |
SEKIGUCHI TOORU;MIYAUCHI ATSUHIRO;AOKI TAKESHI;TANI MICHINORI;WATANABE SEIJI;HONDA MOTOR CO., LTD. |
发明人 |
SEKIGUCHI TOORU;MIYAUCHI ATSUHIRO;AOKI TAKESHI;TANI MICHINORI;WATANABE SEIJI |
分类号 |
F01N3/08;F02D41/00 |
主分类号 |
F01N3/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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