Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
Apparatus for detecting imbalance abnormality in air-fuel ratio between cylinders
An apparatus for detecting imbalance abnormality in an air-fuel ratio between cylinders in a multi-cylinder internal combustion engine comprises a turbocharger, a bypass passage, a waist gate valve, an air-fuel ratio sensor, and a stepless transmission. The imbalance abnormality is detected based upon a variation degree in output of the air-fuel ratio sensor. The internal combustion engine and the stepless transmission are controlled in such a manner that an actual operating point of the internal combustion engine moves on a predetermined operating line in a coordinate system defined by an engine rotational speed and engine torque. The operating line is changed in such a manner that, when the actual operating point is outside of a waist gate valve opening region at the time of detecting the imbalance abnormality, the actual operating point moves into the waist gate valve opening region.
Toyota Jidosha Kabushiki Kaisha
F F F B F B F F Y B B F F F F F F F F
F02D F02D F02D B60W F02D B60W F02D F02D Y02T B60W B60W F02B F02B F02B F02B F02B F02D F02D F02D
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Takayuki Yasuyuki
Otsuka Irisawa