BMW 3 Owners & Service Manuals

BMW 3: System overview

System overview
System overview of hybrid brake system

  1. Hydraulic braking
  2. Signal path
  3. Regenerative braking
  1. High-voltage battery unit
  2. Electric Motor Electronics (EME)
  3. Electric motor
  4. Drive train
  5. Digital Motor Electronics (DME)
  6. Wheel brakes
  7. Dynamic Stability Control (DSC)
  8. Brake pedal with brake pedal angle sensor and brake booster
  9. Accelerator pedal module
  1. Rectified high-voltage (DC) for storing in the high-voltage battery unit
  2. Electrical energy generated by the electrical machine (AC voltage)
  3. Bus message "Accelerator pedal angle" from the DME to the EME (energy recovery in coasting overrun mode)
  4. Bus message "Braking torque setpoint" from the DSC to the EME
  5. Hydraulic pressure from the DSC to the wheel brakes
  6. Hydraulic pressure from the brake booster to the DSC
  7. Electrical signal "Brake pedal angle" from the brake pedal angle sensor to the DSC
  8. Operation of the brake pedal
  9. Electrical signal "Accelerator pedal angle" from accelerator pedal module to the DME (energy recovery in coasting overrun mode)
  10. Releasing the accelerator pedal


     Hydraulic braking

    G20 PHEV, hydraulic braking The brake booster is operated via the driver's foot operation, and the brake actuation is determined by means of the brake pedal angle sensor. Depending on the brak

     Regenerative braking

    The regenerative braking makes possible brake energy regeneration. The electrical machine works here as an alternator and brakes the gears via automatic transmission - propeller shaft - re

     Emergency braking function

    Regenerative braking with help of the drivetrain only effects the rear axle. The brake force on the rear axle must not exceed a specific value in proportion to that on the front axle. This would oth


     Terminal control for driving readiness

    Terminal control from driver's view Vehicle condition - DRIVING Vehicle condition - RESIDING Vehicle condition - PARKING Transitional condition for establishing driving readiness, ending driving readiness or Check/Analysis/Diagnosis Transitional condition with stationary functions Actua

     Through-loading system

    Concept The cargo area can be enlarged by folding down the rear seat backrest. General information The rear seat backrest is divided at a ratio of 40-20-40. The side rear seat backrests and the center section can be folded down separately. The rear seat backrests can be folded down from the cargo a

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