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Vehicular Engines
Published in G. K. Awari, V. S. Kumbhar, R. B. Tirpude, Automotive Systems, 2021
G. K. Awari, V. S. Kumbhar, R. B. Tirpude
The diesel fuel injection system consists of the following parts: Fuel tankIt is mainly to store the diesel; the tank capacity depends on vehicle type and application. The fuel tank contains baffles to avoid fuel surging.SedimentorThe purpose of the preliminary filter is to separate larger droplets of water and abrasive matter that might be present in the fuel.Fuel lift pumpSince fuel tank is mounted below the level of the engine’s fuel pump, a separate pump is required to pump the fuel from the fuel tank to the fuel pump.Main filterThe main filter is used to remove the small abrasive/dust particles that may be present in the fuel. This avoids any damage to the injector. The main filter is required to be cleaned after certain kilometres.Fuel pipelinesFuel pipelines are of two different types: low pressure and high pressure. Low-pressure lines are connected before the pump and pipes which are connected from fuel pump to injector are basically the high pressure lines.InjectorsInjectors are located in the cylinder head and open into the combustion chamber. Pressurized fuel is injected in small droplets into the combustion chamber through injectors (Figure 3.9)
Design of light weight exact discrete event system diagnosers using measurement limitation: case study of electronic fuel injection system
Published in International Journal of Systems Science, 2018
Piyoosh Purushothaman Nair, Santosh Biswas, Arnab Sarkar
Air enters into the intake manifold through the air cleaner, throttle body and air intake chamber of the ‘ Air Flow Subsystem’. The amount of air entering into the engine can be controlled by adjusting the position of the throttle valve present in the throttle body. This varying air intake volume can be measured by monitoring the pressure in the intake manifold. Fuel is pumped from the tank to the injector through the fuel filter and rail by an electric fuel pump which is controlled by a fuel pump relay (see the block named ‘Fuel Flow Subsystem’ shown in Figure 2). The pressure regulator located at the fuel rail maintains a constant fuel pressure across the fuel injector. The injector injects the fuel into the intake manifold where it is mixed with air and the resulting mixture flows into the engine cylinders for burning. The Electronic Control Unit (ECU) is responsible for monitoring and controlling different engine functions by taking as input, information from various sensors located at different parts of the engine. ECU determines the right ratio for the air-fuel mixture based on the engine's RPM and the volume of air in the intake manifold. It then signals the injector to deliver the correct fuel quantity. The block named ‘ Air-Fuel Ratio Control Subsystem’ shown in Figure 2 depicts this control behaviour of the ECU.