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fulltext5Apart from design， the main factors affecting the market success of
a vehicle are performance， fuel consumption， emissions and comfort
Chapter 3 dealt with the available and the required power. Chapter 4 then elabo-rated the principles for selecting overall gearratios. The purpose of this chapter is
now to consider matching the transmission to the engine and the vehicle. This is a
task in the field of vehicle longitudinal dynamics. The powertrain and its compo-nents are optimised by means of computer driving simulation and road and bench
tests. The powertrain components −engine， moving-off element， selector gearbox，
final drive etc. −must be harmoniously” combined. This matching process is
called powertrain matching”. The main optimisation criteria in this process are
• performance，
• fuel consumption，
• emissions and
• comfort.
This adaptation process has to be tackled from both sides， matching the engine to
the transmission and vice versa. In practice， the characteristics of the engine
dominate， and the characteristics of the transmission have to be adapted” to
match.