Main components of a supply unit:
Fuel side: The „jerk-type“ fuel oil pumps deliver fuel into intermediate accumulator. To keep the desired fuel rail pressure (600 - 900 bar), the pump flow rate is regulated via regulating linkage and el.actuators, receiving pressure setpoint signals from WECS. From the accumulator there are two outlets, connecting the accumulator to the fuel rail via two high pressure pipes.
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第一代
第二代
第三代取消 单缸高压油泵
电控柴油机结构
• Common Rail • Exhaust valve
Hydraulic Control • Volumetric Injection Control Unit • Fuel Supply Unit
• 1)结构简单：省去机械定时和油量调节装置 • 2)控制灵活：包括喷油定时，排气定时，多次喷
Fuel pumps
Fuel side Servo oil side
Servo oil pumps
Training Center Winterthur / issue
Training Makes A Difference @ Wärtsilä
01.2005 / hk
Supply Unit Drive
共轨燃油压力控制
Fuel Rail Pressure Control
燃油供应单元布置图
Fuel Pump
Fuel Pump Adjust
燃油喷射量控制
喷油量控制单元
ICU工作原理
ICU, Size 0
ICU, Size 3/4
ICU Cross-Section
ห้องสมุดไป่ตู้
ICU Cross-Section
Supply Unit
To fuel rail
To servo oil rail
Intermediate accumulator
Servo oil side: The servo oil pumps are axial piston swashplate pumps (DYNEX-type) They deliver servo oil into servo oil collector block to keep Servo oil the operating pressure of servo oil ~ 80 Collector block -190 bar. There are two outlets from collector block, connecting to the servo oil rail via two high pressure pipes. The number of fuel- and servo oil pumps depends on the number of cylinders.
Servo oil function
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• Servo oil is used for exhaust valve actuation and control.
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It is supplied by a number of swashplate-type axialpiston hydraulic pumps mounted on the supply unit. The pumps are of standard proprietary design and are driven at a suitable speed through a step-up gear. The working pressure is controllable to allow the pump power consumption to be reduced. The nominal operating pressure is up to 200 bar. The number and size of servo oil pumps on the supply unit depend on the number of engine cylinders. The oil used in both the servo and control oil systems is standard engine system lubricating oil, and is simply taken from the delivery to the engine lubrication system. The oil is drawn through a six-micron automatic selfcleaning fine filter to minimise wear in the servo oil pumps and to prolong component life. After the fine filter, the oil flow is divided, one branch to the servo oil pumps and the other to the control oil pumps.
Electronic Unit）：共轨油压 CYL-EU（ Cylinder Electronic Unit）：VIT、VEO、 VEC Crank Angle Sensor Actuator and Sensor WECS assistant:两组参数 设定 Communication Function： 遥控系统、报警系统、转速 控制、主控模块选择器、安 保系统
Three-dimensional drawing of the inside of a rail unit for an RT-flex96C engine
• A：fuel rail • B：control oil rail • C：servo oil rail • D：ICU (injection
1、Sulzer电控柴油机共轨技术
• WECS-9500 ：Wärtsilä Engine Control
System • CCU：Cylinder Control Unit • Injection control unit • Exhaust valve control • Starting control • Diesel Engine Interface Specification （DENIS ）
Injection 、Exhaust 、Start Servo oil pump
4、燃油系统的控制
ICU：Injection Control Unit
Supply unit: fuel pumps & servo oil pumps
fuel pumps & servo oil pumps
Wartsila RT-flex Size I
2、公共电子单元COM-EU
• 模式识别模块ASM：
选运行板 • 主控板MCM700： 与外界通信 • ASM10发指令给燃 油泵、控制油泵 • 主控板控制启动空 气阀
3、气缸电子控制单元（CYL-EU）
• 气缸控制模块CCM • 阀件驱动模块VDM
Crank angle sensor
Piston position
喷油方式举例
5、液压伺服油压力控制
12RT-flex96C： • (A) the local engine control panel • (B) the automatic fine filter for servo and control oil • (C) two electrically-driven control oil pumps • (D) the supply unit
control unit) • E: Exhaust valve actuation
Size IV rail unit
• Inside a Size IV rail unit during assembly. The exhaust
valve actuator (A) is mounted on the servo oil rail and the injection control unit (B) is on the fuel rail. Next to the fuel rail is the smaller control oil rail (C) and the return pipe for servo and control oil (D).
2、电控柴油机控制系统组成
3、电控柴油机控制系统功能
• 分散式控制方
案满足适时性 • 现场（双）总 线方式交换传 递信息 • EU:Engine Unit • CU:Cylinder Unit • S:Sensor
电控柴油机控制系统方框图
二、Wartsila公司RT-flex系统
RT flex-60c共轨系统的组成
• Precise volumetric control of fuel injection, with
integrated flow-out security • Variable injection rate shaping and variable injection pressure • Possibility for independent action and shutting off of individual fuel injection valves • Ideally suited for heavy fuel oil • Well-proven standard fuel injection valves • Proven, high-efficiency common-rail pumps • Lower levels of vibration and internal forces and moments • Steady operation at very low running speeds with precise speed regulation • Smokeless operation at all speeds.