BMW 3: 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 - rear axle differential - output shafts. The high-voltage battery unit is charged with the energy generated here via the Electrical Machine Electronics.
A brake pedal angle sensor directly at the brake pedal records the path of the brake pedal.
The free travel of the brake pedal has also been increased. In the event of brake actuation, braking is therefore purely regenerative in this range without hydraulic brake pressure. The brake pads of the wheel brakes are only applied at the brake discs in this operating condition. However, they do not generate braking power. This increases the efficiency of the drive, as more usable energy can be fed back into the high-voltage battery unit.
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Components for input signals of brake energy regeneration
- Brake pedal with brake pedal angle sensor
- Accelerator pedal module
- Digital Motor Electronics (DME)
- Dynamic Stability Control (DSC)
Decisive input variables for regenerative braking are the accelerator pedal angle and the brake pedal travel.
- The brake pedal angle is measured by the brake pedal angle sensor, converted to brake pedal travel and read in by the Dynamic Stability Control.
- The accelerator pedal angle is measured by the accelerator pedal module and read in by the DME.
The electrical machine is operated as an alternator when the brake pedal is not operated but the accelerator pedal is at an angle of 0º. The Electrical Machine Electronics activates the electrical machine in such a way that a brake force is obtained for the complete vehicle which corresponds to a conventional vehicle in coasting (overrun) mode. Depending on the driving mode selected, the deceleration which occurs during the coasting energy recovery is different.
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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
Voltage supply
The 12 V vehicle electrical system of the G20 PHEV is essentially the same as
the electrical system of
the G20. The main difference lies in the fact that the power supply is no longer
by the al
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Overview
G20 PHEV, system overview of climate control - Installation locations
Combined expansion and shutoff valve at the evaporator
Combined expansion and shutoff valve at the high-voltage battery unit
High-voltage battery unit
Refrigerant lines to high-voltage battery unit
Evaporator, passenge
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
