In the USA a cycle known as the Federal Test Procedure FTP-75 is
used (Figure 8.16). This has been added to and became known as the
Supplementary Federal Test Procedure (SFTP).
8.4 Fuel injection
8.4.1 Advantages of fuel injection
The major advantage of any type of fuel injection system is accurate control of
the fuel quantity injected into the engine. The basic principle of fuel injection
is that if petrol is supplied to an injector (electrically controlled valve), at a
constant differential pressure, then the amount of fuel injected will be directly
proportional to the injector ...
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