Fuel-pressure-sensor diagnosis device
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United States of America Patent
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Feb 17, 2015
Grant Date -
May 23, 2013
app pub date -
Nov 23, 2012
filing date -
Nov 23, 2011
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Abstract
A fuel-pressure-sensor diagnosis device is applied to a fuel injection system having a plurality of fuel pressure sensors detecting a fuel pressure which is provided to a fuel injector of each cylinder, and a control portion controlling the fuel injectors by using a computed result which is computed based on a variation in the fuel pressure detected by the fuel pressure sensor due to a fuel injection. Two pressure sensors of which pulsation values of the detected fuel pressure are in a specified range are selected among the multiple fuel pressure sensors. For example, a pair “A” refers to the sensors #1 and #3, a pair “B” refers to the sensors #3 and #4, a pair “C” refers to the sensors #4 and #2, and a pair “D” refers to the sensors #2 and #1. An ECU diagnoses whether the selected sensors are faulty by comparing the detected values.
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