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FAQ: Jargon Buster

05 Feb 07

I

IN THIS FEATURE

iDrive

BMW's control system for non-core functions such as hi-fi, sat nav, ventilation/air conditioning, seat position and phone, using scroll-down menus, a large dial and buttons all in one computer-style unit. Similar in concept to Audi's MMI and Mercedes' COMAND, but has become a byword for overcomplexity.

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Ignition

The system that creates and controls the timing of electrical sparks which ignite the air/fuel mixture in the engine.

Independent suspension

Each wheel is sprung separately, so if one hits a bump it doesn't affect the others. A system used in most modern road-going passenger cars, especially at the front. Makes for a smoother ride and better handling. See also Live axle.

ISG (integrated starter-generator)

A combination of the ignition and alternator into a single unit. More efficient and reliable, it allows for a system further combined with, for example, Stop-Start and regenerative braking technologies for fuel-saving. Can drive a small electric motor, as in so-called mild hybrids, to supplement the engine power.

Isofix

A standardised system of fixing points to anchor child seats into a car. Now standard in most family cars and other models, it enables the safe use of compatible child seats. [See also: Child seat]

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