Powertrain systems for passenger cars

Systems for Hybrid Vehicles

Function

Hybrid propulsion combines an internal-combustion engine with an electric machine. The electric drive unit relieves the load on the combustion engine particularly in situations in- volving above-average fuel consumption such as driving off or accelerating. It helps to cut down fuel consumption and CO₂ output especially in urban traffic. Pollutant emissions are thus reduced. Hybrid vehicles are already on the market as long-range vehicles suitable for everyday use.

By comparison with a conventional drive unit, the hybrid can save up to 25% of fuel.

Further information

Powertrain electrification

Electric machine

The electric machine has two functions: as a motor it drives the vehicle using electricity. As a generator it helps to convert the kinetic energy generated by braking into electrical energy.

Inverter

The power electronics is the connection between the battery and the electric machine. It converts the direct current of the high-performance battery into the alternating current required to power the electric motor.

Cooperative regenerative braking system

Traditional braking maneuvers represent a waste of the kinetic energy that has only just been generated via fuel combustion.

The cooperative regenerative braking system ensures that as much braking energy as possible is recuperated and stored as electrical energy. To do this, the generator is used to slow the vehicle down. As soon as the braking requirements exceed the braking capacity of the generator, the classic wheel brakes are applied.

The cooperative regenerative braking system fulfills the same safety requirements as conventional braking systems.

High-voltage battery

The battery supplies the electric machine during electric propulsion. When driving with the combustion engine and during regenerative braking, the battery is charged by the electric machine.

With its partner Samsung SDI, Bosch has founded the joint-venture company SB LiMotive. Samsung SDI is experienced and successful in the large-series manufacture of high-quality lithium-ion cells and systems (Li-Ion). Bosch provides the joint venture with decades of automobile experience. With this shared know-how, SB LiMotive develops, manufactures and markets reliable, powerful and high-quality lithium-ion batteries with battery management systems at competitive prices for use in vehicles.