发明名称 |
INTER-CYLINDER AIR/FUEL RATIO IMBALANCE DETERMINATION APPARATUS AND INTER-CYLINDER AIR/FUEL RATIO IMBALANCE DETERMINATION METHOD |
摘要 |
The invention provides an inter-cylinder air/fuel ratio imbalance determination apparatus and method. The determination apparatus includes a“limiting current type air/fuel ratio sensor”, and acquires a pre-correction index quantity that is greater the greater the degree of non-uniformity of the cylinder-by-cylinder air/fuel ratios, on the basis of a time differential value of the output value of the air/fuel ratio sensor. The determination apparatus obtains as the correction-purpose output value an average value of the output value obtained during a fuel-cut operation. The correction-purpose output value is greater the higher the responsiveness of the air/fuel ratio sensor. The determination apparatus acquires an air/fuel ratio imbalance index value by correcting the pre-correction index quantity so that the pre-correction index quantity is smaller the greater the correction-purpose output value. It is determined that an inter-cylinder air/fuel ratio imbalance state has occurred, when the air/fuel ratio imbalance index value is greater than or equal to an imbalance determination threshold value.
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申请公布号 |
US2012024274(A1) |
申请公布日期 |
2012.02.02 |
申请号 |
US201113194915 |
申请日期 |
2011.07.30 |
申请人 |
HAKARIYA MASASHI;OKADA MASAHIDE;TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
HAKARIYA MASASHI;OKADA MASAHIDE |
分类号 |
F02D41/00 |
主分类号 |
F02D41/00 |
代理机构 |
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