Integral Electric Throttle System (EML) Functional Description
When the accelerator pedal is moved, the PWG provides a change in the monitored signals. The X5 ME 7.2 compares the input signal to a programmed map and appropriately activates the EDK motor via proportionally high/low switching circuits. The control module self-checks its activation of the EDK motor via the EDK feedback potentiometers. See Fig 1. Requirements placed on the Electric Throttle System (EML):
- Regulate the calculated intake air load based on PWG input signals and programmed mapping.
- Control idle air with regard to road speed as per previous systems.
- Monitor driver's input request for cruise control operation.
- Automatically position EDK for accurate cruise control operation.
- Perform all DSC III throttle control interventions.
- Monitor and carry out maximum engine and road speed cutout.