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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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
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Operation via touchscreen
General information
The Control Display is equipped with a touchscreen.
You can tap on menu items and widgets. Touch
the screen with your fingers. Do not use any objects.
Opening the main menu
Tap on the symbol.
The main menu is displayed.
Adjusting widgets
The widgets can be adjusted in the main
Sensors
Sensors, electrical machine
Temperature sensor
Rotor of the rotor position sensor
Stator of the rotor position sensor
So that the voltages for the coils in the stator can be correctly calculated
and generated by the
Electrical Machine Electronics in terms of amplitude and phase layer, the
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