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The friction produced during opening and closing of the piezo injectors causes wear on the nozzle seat of the nozzle needle. This changes the injection quantity over the service life, which is compensated for by correcting the actuation duration. Injection quantity correction comprises the following:
• Zero quantity calibration
• Main injection quantity correction
The following function requirements are required for
this:
• Engine speed between 1,000 and 2,600 rpm
• Deceleration mode or driving operation greater
than zero
• Engine oil temperature greater than 80 °C
That's for CDI but it gives you an idea. Our motors run at 88c instead of 80 on CDI
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