Monitor B1

Method used:  Difference method of 360 degrees CA

Monitor value:  domg360 = (omg 1 - omg 0) - (omg 3 - omg 2) = angular speed

Each crankshaft angular speed is defined as Fig 1 below.

Fig 1: Identifying Firing Order And Crankshaft Angular Speed (Description Of Domg360 Output)

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This method uses the fact that the domg360 of lean conditioned cylinder caused by imbalance malfunction indicates big value, as shown by the chain line in Fig 2 below.

The number of times for domg360 to exceed the judgment value in 1000 revolutions (500 cycles) is calculated as diagnostic value 2 (DV2). A malfunction is determined when DV2 exceeds the threshold.

Fig 2: Comparision Malfunctioned Domg360 Output With Normal Output

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