ELECTRONICALLY-CONTROLLED THROTTLE DEVICE

摘要

PROBLEM TO BE SOLVED: To improve diagnostic accuracy by preventing the mistake of determination without widely configuring a threshold for determining failures of a sensor. SOLUTION: An ECU 100 is provided with: the totally-closed lower limit-operation parts 113 and 123 for setting up the totally-closed lower limits (lapm 2) and (laps 2) of main- and sub-sensors 14a and 14b, respectively; a main sensor output-difference value-operation part 114 for obtaining an output difference value (aparam) from the totally-closed lower limit (lapm 2) and output value (apadm) of the main sensor 14a; a sub-sensor output-difference value-operation part 124 for obtaining an output difference value (aparas) from the totally-closed lower limit (laps 2) and output value (apads) of the sub-sensor; a totally-closed learning value-operation part 125 for learning the totally-closed learning value (laps 2d) of the sub-sensor 14b based on its lower limit (laps 2) and its output value (apads); a threshold value-operation part 127 for obtaining a threshold (kOAPSCNG) based on the sub-sensor output value (apads) and the totally-closed learning value (laps 2d); and an abnormality determination part 131 for determining abnormality of the sensors 14a and 13a by comparison of the difference of the output values (aparam) and (aparas) with the threshold (kOAPSCNG). COPYRIGHT: (C)2006,JPO&NCIPI