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                                        FUEL INJECTION SYSTEMS                                    o
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                                                          DIESEL                                  v
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                                      RuiManuelVieiraPinto
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                                        Fuel injection systems - diesel                           t
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                                          1 - Basic diesel fuel systems                           s
                                                                                                   
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                                          2 – Injection pumps                                     o
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                                          3 - Injectors                                           v
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                                          4 - Inline injection pump                               s
                                          5 – Radial rotary injection pump
                                          6 – Electronic injection systems
                                          7 - Bibliography
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                                  1 - Basic diesel fuel  ó
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                                                         systems                                                         s
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                                                       Basic diesel fuel systems                                         t
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                                         -Basic diesel engine operation                                                  u
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                                                       - Diesel engine force air by the intake valve                     m
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                                                       into the cylinder                                                 v
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                                                       - High compression ratio heats the air enough                     s
                                                       to ignite the fuel)
                                                       - Fuel is injected into the cylinder at high 
                                                       pressure
                                                       - The amount of fuel injected suits to the load 
                                                       and controls engine speed
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                                                    Basic diesel fuel systems                                      t
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                                      - Basic diesel fuel systems                                                  A
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                                          - Divided in 2 sections                                                  m
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                                               - Low pressure side                                                 e
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                                                                    - Clean the fuel                               s
                                                                    - Deliver fuel to high pressure side
                                               -Highpressureside
                                                                     - Raise the fuel pressure high
                                                                     enoughtoinjection stage
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                                                     Basic diesel fuel system                                      t
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                                         - Basic diesel fuel system                                                 
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                                                      - A lift pump takes fuel from the tank and keeps the         o
                                                      injection pump full with fuel (electric or mechanical, on    m
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                                                      theengineorontheinjection pump)                              v
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                                                      - A filter removes water and large particles of the fuel     s
                                                      - A fuel filter removes extremely small particles
                                                       - Fuel under high pressure passes along injector pipes 
                                                      (steel, with same length) to injectors by the action of 
                                                      injector pump (synchronism with engine cycle)
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                                   - Basic diesel fuel system                                                   a
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                                            - Injector sprays fuel into combustion chamber                      u
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                                                     - Direct injection engine                                  m
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                                                                      - Combustion chamber not                  v
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                                                                      divided                                   i
                                                                      - Direct injection on                     s
                                                                      combustionchamber
                                                                      - Superior efficiency
                                                     - Indirect injection engine
                                                                      - combustion chamber divided
                                                                      - Low noise level
                                                                      - Low production costs
                                                                      - More fuel consumption (10–15 %)
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                                                   Basic diesel fuel system                                     t
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                                   - Basic diesel fuel system                                                   s
                                                                                                                 
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                                            - Leak off pipes take excess of fuel back to the tank (also         o
                                            removeairfromthesystem)                                             m
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                                            - The combustion pressures are greater in a diesel engine than      e
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                                            in a similar gasoline engine (components stronger and heavier)      s
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