Hydraulic brake mode, function - GF42.22-P-1002FLH

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MODEL 212.095/098/298 up to model year 2014

Diagram of operating principle

Fig 1: Hydraulic Brake Mode Operation Diagram

Courtesy of MERCEDES-BENZ USA

Function requirements for hydraulic brake mode, general

Circuit 15 ON
RBS [regenerative braking system] control unit operational

Hydraulic brake mode, general

The driver's braking request is recorded by the pedal angle sensor and sent to the regenerative braking system control unit. The regenerative braking system control unit communicates continuously over the chassis CAN (CAN E) with the CDI control unit (N3/9) (for diesel engine) or ME-SFI [ME] control unit (N3/10) (for gasoline engine) and the power electronics control unit about the value of the currently-available, required and the implemented regenerative braking torque.

If it is not possible to realize regenerative sensing of the brake torque, then the braking torque is only generated hydraulically by the wheel brakes.

Hydraulic brake mode function sequence

To generate hydraulic pressure in the wheel brakes, the regenerative braking system control unit actuates the BAS solenoid valve, whereby the BAS brake booster generates hydraulic brake pressure. In this instance the free travel (3) is not reduced.

The distribution of the brake pressure to the front and rear axles is realized by a brake pressure distribution in the hydraulic unit traction system.

The electrical machine is not actuated.

Overview of system components for regenerative braking system

GF42.22-P-9999FLH