funtion_HDI_siemens(1).pdf

Function:HDI Direct Injection System(SIEMENS SID 801)

1 - Components Common With The Document:"Operating Principle - HDI

Direct Injection System (High Pressure Diesel Direct Injection)"

components common with the document :

· fuel high pressure common injection rail

· battery(BB00)

· accelerator pedal sensor(1261)

· engine speed sensor(1313)

· the camshaft position sensor ( 1115 )

· engine coolant temperature sensor(1220)

· air temperature sensor(1310)

· fuel temperature sensor(1221)

· brake switch(2100)

2 - Components Common With The Document:"Operating Principle - HDI

Direct Injection System (High Pressure Diesel Direct Injection)"(BOSCH

ECD15 C2)-FAP System(Particle Filter)

components common with the document :

· redundant brake pedal switch(7308)

· clutch switch(7306)

· vehicle speed sensor(according to vehicle)

3 - Specific Elements

features of the DW10TD engine :

· high pressure fuel pump

· fuel flow actuator ( 1277 )

· fuel high pressure regulator(1322)

· fuel high pressure sensor(1321)

· injection ECU(1320)

· diesel injectors(1331, 1332, 1333, 1334)

4 - High Pressure Fuel Pump

4.1 - Role

role of the high pressure fuel pump( SIEMENS CRV FT6186 type with 3 pistons) :

· the pumping of the fuel(integral transfer pump)

· to supply high pressure fuel

· to supply the diesel injectors through the high pressure common injection rail

4.2 - Description

page 1 sur 21

(1)transfer pump(pre-supply)

(2)high pressure piston

(3)fuel high pressure regulator

(4)fuel flow actuator

(5)eccentric pump shaft

" a ":fuel inlet(low pressure)

" b ":high pressure fuel outlet(to the common injection rail)

" c ":return to fuel tank

page 2 sur 21

(1)transfer pump(pre-supply)

(2)high pressure piston

(3)fuel high pressure regulator

(4)fuel flow actuator

(6)pressure limiter

(7)lubricating valve

" a ":fuel inlet(low pressure)

page 3 sur 21

" b ":high pressure fuel outlet(to the common injection rail)

" c ":return to fuel tank

the high pressure fuel varies between 220 and 1500 bar

NOTE

the high pressure fuel is controlled by the high pressure fuel regulator

NOTE

the fuel flow entering the high pressure pump is controlled by the fuel flow actuator

components mounted on the high pressure fuel pump :

· high pressure fuel regulator ( 3 )

· fuel flow actuator ( 4 )

NOTE

the high pressure pump is not a distributing pump and does not need setting

the transfer pump ( 1 ) draws in fuel and delivers it to the following components(integral transfer

pump) :

· lubricating valve ( 7 )

· fuel flow actuator ( 4 )

when the fuel flow actuator is not energised :

· the pressure limiter ( 6 ) opens

· the fuel is directed to the suction side of the transfer pump ( 1 )

the lubricating valve ( 7 ) is used to lubricate the high pressure fuel pump

the fuel enters the fuel pump, passes through the lubricating valve ( 7 ) and returns to the tank,at

" c "

4.3 - Creating The High Pressure

page 4 sur 21

A-suction phase

B-delivery phase

(2)high pressure piston

(5)eccentric pump shaft

(8)fuel suction valve

(9)delivery ball valve

the shaft of the high pressure fuel pump contains a cam

the injection pistons are supplied with fuel by the low pressure circuit inside the high pressure

pump

the fuel is drawn in by the piston during the suction phase

A-suction phase :

· the fuel from the flow actuator " d " is drawn in through the suction valve ( 8 )

· the return spring pushes the piston back against the cam

· the piston creates a vacuum in the liner(the delivery valve ( 9 ) closes)

B-delivery phase :

· after bottom dead centre

· the fall in fuel pressure causes the suction valve to close ( 8 )

· the fuel is blocked in the chamber

· the cam of the high pressure fuel pump pushes the piston

· the fuel pressure increases

· the fuel is delivered to the delivery valve

· the delivery valve ( 9 ) opens

after top dead centre, the delivery valve closes following the reduction in pressure

5 - Transfer Pump(Pre-Supply)

5.1 - Role

page 5 sur 21

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