BMW 3: 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 brake pedal angle sensor signal, the valves in the Dynamic
Stability Control (DSC)
are switched so that the brake fluid volume is filled into the pressure storage
chambers of the DSC.
This causes an artificial extension of the brake pedal free travel. This free
travel extension is used for
additional recuperative brake energy regeneration. As of a certain brake pedal
travel, the valves are
closed and the hydraulic intervention of the driver on the wheel brake is
restored.
As brake recovery is reduced, the volume from the pressure accumulator is pumped
into the wheel
brakes with the help of the return pump.
The vehicle is thus not decelerated with the friction brake on the rear axle at
various operating points,
but via energy recovery of the electrical machine.
The recuperation level is reduced or is not permitted in the following operating
conditions:
- On detection of adversely affected driving stability, the energy
recovery level is reduced.
- If emergency braking is detected, the driver's braking request is
realized purely hydraulically in
order to ensure faster implementation of the hydraulic interventions at the
individual wheels as
required.
- If no energy recovery is available (e.g. high-voltage battery unit fully
charged), the driver's braking
request is realized as described. In this case, the energy recovery level is
zero and the return
pump generates the complete hydraulic brake pressure required to achieve
vehicle deceleration.
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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
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
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The settings are stored in the currently used
driver profile.
Treble, bass, balance, and
fader
1. "CAR".
2. "Settings".
3. "General settings".
4. "Sound settings".
5. Select the desired setting:
"Treble": treble setting.
"Bass": bass setting.
"Balance": left/right volume distribution.
"Fade
Comparison belt drive B46 engine and B46TU/B48TU engines
B46 Engine (transverse installation shown)
B46TU/B48TU engines (transverse installation shown)
Deflecting element
Alternator
Coolant pump
Air conditioning compressor
Ribbed belt
Torsional vibration damper
Belt tensioner
The