BMW 3: Introduction
BMW 3 Series G20 (2018-2025) Training manual / Hybrid Brake System / Introduction
The function of the brake system of the G20 PHEV is to decelerate the vehicle safely under stable conditions. Vehicle deceleration is made up of the following elements:
- Conventional hydraulic braking
- Regenerative braking
Thanks to regenerative braking it is possible to convert the kinetic energy of the vehicle into electrical energy with the help of the electrical machine, and to therefore charge the high-voltage battery unit.
The service brake of the G20 PHEV is based on that of a conventional G20. In this chapter only the hybrid-specific components and functions are described.
In comparison to the conventional G20, the following new or modified components are used:
- Brake pedal travel sensor
- Brake vacuum pressure sensor
- Modified vacuum brake system
- Modified DSC unit
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System overview
System overview of hybrid brake system
Hydraulic braking
Signal path
Regenerative braking
High-voltage battery unit
Electric Motor Electronics (EME)
Electric motor
Drive train
Digital Moto
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
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Cooling system
To increase the service life of the high-voltage battery unit and obtain the
greatest possible power, it
is operated in a defined temperature range. The high-voltage battery unit is
essentially operational at
an ambient temperature of -40 ºF to 131 ºF (-40 ºC to +55 ºC ) (actual cell
Run-flat tires
Concept
Run-flat tires permit continued driving under restricted
conditions even in the event of a complete
loss of tire inflation pressure.
General information
The wheels consist of tires that are self-supporting,
to a limited degree, and possibly special
rims.
The support of the sidewall allows t
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