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Electronic Differential Lock (EDL)

Electronic Differential Lock (EDL): ABS tracks wheel-speed slip tendency and modulates hydraulic/electronic brake pressure. The page also includes a worked example and measurement sequence.

6 concrete technical facts1 worked example2 sources

Technical frame

Electronic Differential Lock (EDL): ABS tracks wheel-speed slip tendency and modulates hydraulic/electronic brake pressure. The page also includes a worked example and measurement sequence.

The technical values here expose the standard, protocol or physical relationship directly; model-specific service values are linked through the matching model/variant dossier.

The goal is not only to define the term but to let the reader calculate and interpret what the data means in a scan, scope or physical test.

Concrete technical facts

  • ABS tracks wheel-speed slip tendency and modulates hydraulic/electronic brake pressure.
  • Longitudinal slip can be simplified as (vehicle speed − wheel speed) / vehicle speed.
  • Plotting all four wheel speeds together is more powerful than reading one ABS sensor in isolation.
  • Active wheel-speed sensors may be 2-wire current-modulated or 3-wire digital devices, so treating them like passive resistance sensors can be wrong.
  • ESC checks plausibility among yaw rate, lateral acceleration, steering angle and wheel speeds.
  • Brake-by-wire or brake-blending diagnosis separates pedal/demand, commanded pressure/torque and actual pressure/deceleration.

Worked example

  • Slip example: if vehicle speed is 20 m/s and a wheel corresponds to 16 m/s, slip=(20−16)/20=20%.

Measurement and verification sequence

  • Plot all four wheel speeds together.
  • Check steering-angle/yaw/lateral-acceleration plausibility.
  • Compare pedal/demand with commanded pressure/valve state.
  • Separate electrical sensor signal from encoder/bearing mechanical condition.

Fault-separation logic

  • Is a valid command present and are power/ground/network healthy?
  • Does feedback follow the command?
  • Does an independent physical measurement confirm the output?
  • Is the fault limited to a specific temperature/load/speed condition?
  • Does the result remain stable when the original condition is repeated after repair?

Technical sources

  1. Use the verified English application data on this page and confirm vehicle, model year, market and powertrain identity before applying technical values.
  2. Bosch Mobility technical knowledge

Continue investigating

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