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| The injection system is equipped with an idling speed smooth running control function. The system is able to detect differences in the performance of the individual cylinders (component tolerances, nozzle output, compression etc.) and compensate by adjusting the injection quantities accordingly at idling speed. |
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| Differences in cylinder performance at idling speed are detected by the engine speed sender, which sends the control unit six signals per crankshaft revolution. If the signals are being sent at uniform intervals, this means that all cylinders are performing equally. If one cylinder is weaker, the crankshaft will take longer for its next 120° revolution. Conversely a more powerful cylinder will accelerate the crankshaft so that less time is needed for the half revolution. |
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| If the control unit detects a difference, the injection quantity for the relevant cylinder is immediately increased or decreased as required until the engine runs evenly again. |
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| The measured value block shows the differences between the injection quantities of the individual cylinders and the injection quantity of No. 3 cylinder. In each case the difference represents the quantity required to ensure an even engine idling speed. |
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| +... mg/H: The relevant cylinder is less powerful than No. 3 cylinder and is therefore supplied with more fuel. |
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| -... mg/H: The relevant cylinder is more powerful than No. 3 cylinder and is therefore supplied with less fuel. |
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