| Analysis: Display field 013, display field 1 through 4 - Idle smoothness regulator |
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| The injection system has an idle smoothness regulator. It is possible to detect differences in performance between individual cylinders (part tolerances, injector flow, compression etc.) and to compensate for these by selectively metering the quantity injected in the idling speed range. |
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| Differences are detected in the idling speed range on the basis of the signal supplied by the engine speed sender which supplies four signals to the control unit for each crankshaft revolution. If the signals have the same rhythm, the cylinder have the same output. If a cylinder has a lower output, the crankshaft will need more time for the next half crankshaft rotation. As opposed to this a high output cylinder will accelerate the crankshaft to such an extent that it will need less time. |
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| Once the control unit has identified a deviation, the relevant cylinder will immediately be supplied with a greater or smaller injection rate until the engine again runs “smoothly”. |
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| +… mg/s: The relevant cylinder has less output and is therefore supplied with more fuel. |
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| -… mg/s: The relevant cylinder has more output and is therefore supplied with less fuel. |
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