Injector - wsm M7060 Workshop Manual

M6060, M7060, WSM

[4] INJECTOR

The injectors inject high-pressure fuel from the rail
into the combustion chamber of the engine, using
signals from the engine's ECU to produce the ideal
timing, amount of fuel, mixture and spray.
The injector injects a finely tuned spray in three
pulses during the combustion stage. First a small
amount is injected, mitigating the effect of the initial burn
and reducing NOx (oxides of nitrogen) and noise. The
main injection follows with the real burn, and in the last
stage, a diffuse combustion is induced, thus reducing
particulate matter (PM) generated by the main injection.
Injector Architecture
Injectors consist of nozzle components (nozzle (10)
and needle valve (9)), a TWV (two-way valve) (5), which
controls the volume and mixture of fuel, a control
chamber (7) with an intake orifice and discharge orifice
(6), a command piston (8) and a nozzle spring.
(1) Engine ECU
(2) Rail Pressure Sensor
(3) Rail
(4) Supply Pump
(5) TWV (Two-way Valve)
(6) Discharge Orifice
(7) Control Chamber
(8) Command Piston
(9) Needle Valve
(10) Nozzle
(11) Injection Amount
(12) T.D.C (Top Dead Center)
(13) B.D.C (Bottom Dead Center)
(14) Crank Angle
1-M15
ENGINE
A: Pre-injection
B: Main Injection
C: After Injection
D: Post Injection
9Y1210828ENM0024US0
KiSC issued 08, 2013 A