Page 214 - 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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198 Automobile mechanical and electrical systems

Figure 2.239 Bosch gasoline direct injection (GDi). (Source: Bosch Media)

Figure 2.240 Ignition and fuel systems are now always combined

Modern petrol injection systems are linked to the ignition systems and are
controlled by an engine control module (ECM) ( Fig. 2.240 ). All modern fuel
injection systems have closed loop electronic control using an EGO sensor.
The components for any electronic fuel injection system can be divided into three
groups ( Fig. 2.241 ):
electronic control system (ECU, sensors and actuators)
●
air supply components
●
fuel supply components.
●
2.5.2.1 Electronic control system

At the heart of EFi systems is the fuel control or ECU with a stored map of
operating conditions (also referred to as the electronic control module or ECM)
( Fig. 2.242 ). Electronic sensors provide data to the microprocessor in the ECM,
which calculates and sends the output signals to the system actuators, which are
the fuel pump, fuel injectors and idle air control units. The ECM will also switch
some of the exhaust emission and auxiliary system components. ECU and ECM
tend to be used interchangeably.