Page 188 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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172 Automobile mechanical and electrical systems

Figure 2.183 Evaporative emission control system (EVAP) canister

Figure 2.184 Turbocharger with electronic control. (Source: Bosch Media)

Engine performance has been increased, without an increase in weight, by the
use of supercharging and turbocharging ( Fig. 2.184 ). Other emission-control
devices that correct the ignition timing and fuel delivery are covered in the
appropriate sections. These devices improve the performance of those systems,
as well as reducing harmful exhaust emissions.

2.4.3 Air supply system

The air supply system has to provide clean air in suffi cient quantity to the engine
( Fig. 2.185 ) and supply equal quantities of air to each cylinder. This will assist
Key fact fuel vaporization and an even mixture distribution. Creating a swirl in the air fl ow
Creating a swirl in the air fl ow as as it enters the cylinders is also desirable. A system of warm air for cold starts,
it enters the cylinders improves followed by temperature-controlled air for normal running, is essential. Finally, the
effi ciency. system must silence the air fl ow and provide a fl ame trap in the event of fi re in
the inlet manifold.
The air supply systems for most vehicles are similar. They consist of an air-intake
duct, an air-temperature control mechanism, an air-cleaner housing and fi lter,
an inlet manifold and inlet ports. A position for an EGR system may also be