Monitor B1

Method used:  Difference method of 360 degrees CA

Monitor value:  domg360 = (omg 1 - omg 0) - (omg 4 - omg 3) = angular speed

Each crankshaft angular speed is defined as Fig 1 below.

Fig 1  Description of domg360 output 

Fig 1: Crankshaft Angular Speed Diagram

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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 667 revolutions (333 cycles) is calculated as condition value 2 (CV2). A malfunction is determined when CV2 exceeds the threshold.

Figure 3. Compare malfunctioned domg360 output with a normal output omg7 omg6 omg5 omg4 omg3 omg2 omg1 omg0 

Fig 2: Judgement Value Graph

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