Monitor B1
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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 Figure 2 below.
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 Figure 3 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.