BMW Active Hybrid 5 Bedienungshandbuch PDF herunterladen (Seite 29)

BMW ActiveHybrid

Hybrid system

At a glance

1 Combustion engine

2 Electric motor

3 High-voltage cables: orange

4 High-voltage battery

The concept

The hybrid system makes it possible to optimize

fuel consumption and driving characteristics.

An electric motor supports the combustion en‐

gine in certain driving situations. This lowers fuel

consumption.

In addition to this, the electric motor acts like an

alternator: during braking, it converts the vehi‐

cle's kinetic energy into electricity. The current

is stored in the high-voltage battery and is used

to drive the electric motor.

The hybrid system combines the following func‐

tions:

▷ Acceleration boost.

▷ Energy recovery: conversion and storage of

kinetic energy as electric current.

▷ Automatic engine start-stop function: auto‐

matic stopping and starting the combustion

engine when standing, for instance at a traf‐

fic light.

▷ Electric operation of the automatic climate

control.

Functions

Boost

Driving off and accelerating require a lot of en‐

ergy. To reduce fuel consumption during high

acceleration and to optimize acceleration, the

electric motor supports the combustion engine.

For this purpose, the electric motor is supplied

by the high-voltage battery.

Energy recovery

The high-voltage battery of the hybrid system is

charged through energy recovery.

The electric motor acts as a generator and con‐

verts the motion of the vehicle into electric cur‐

rent.

Charging can take place in various situations

while the vehicle is being driven:

▷ When the vehicle is rolling if the accelerator

is not pressed.

▷ During vehicle braking.

When exerting gentle pressure on the brakes,

the vehicle is only braked by the electric motor.

When the brake pedal is depressed further, the

brake system is activated additionally. This is

why only part of the brake energy is used to

charge the high-voltage battery when exerting

firm pressure on the brake.

Foresighted driving and the early reduction of

speed are important to make full use of the hy‐

brid characteristics of your vehicle.

Automatic Engine Start/Stop Function

The automatic engine start-stop function, refer

to page 67, switches the combustion engine

off during a stop. Convenience functions such

as the automatic climate control are supplied by

the high-voltage battery and can remain

switched on. The combustion engine starts

again automatically for driving off.

Seite 29

Online Edition for Part no. 01 41 2 603 958 - 03 10 500

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