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Dr. vora ppt chapter 6 crs
1. COMMON RAIL SYSTEM (CRS)
FOR DIESEL ENGINES
By : Dr.K.C.VORA
SR. ASST. DIRECTOR
ENGINE DEVELOPMENT LABORATORY
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2. CONTENTS
Introduction
System types & Generation
Common Rail & emission strategy
System Validation & tests
Project milestones
ENGINE DEVELOPMENT LABORATORY
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3. INTRODUCTION
TECHNOLOGY DRIVERS
• Emission regulations (Exhaust gas and
Noise)
• Further fuel economy improvements
• Further improvements in
- Reliability
- Durability of engine/vehicles
• Competitive costs and prices
ENGINE DEVELOPMENT LABORATORY
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4. Cam driven FIE
Pressure generation and injection are coupled
ENGINE DEVELOPMENT LABORATORY
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9. TECHNOLOGY DEMANDS ON FIE
• High pressure potential (> 2000 bars)
• Realisation of the “ideal” rate of injection via pressure modulation
alone
• Capability of realising staged (boot) as well as pilot injection
where pilot is separated from the main injection
• Flexibility of selecting start of injection as well as end of injection
• Moderate initial rise of main injection
• Sharp cut off of the injection end
• Flexibility of selecting peak injection pressure
• Provide option to automatically change rate shape according to
engine speed and load
ENGINE DEVELOPMENT LABORATORY
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27. CRS- ELECTRONIC CONTROL UNIT (ECU)
150mm from ECU
4 Plane screwing points
< 60 C
Away from water splash
Away from battery
ENGINE DEVELOPMENT LABORATORY
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33. CRS ADVANTAGES
• Separation of pressure generation and injection allowing flexibility
in controlling both the injection rates and timing.
• Fuel pressure does not depend on the engine speed and load
conditions
(This feature differentiates the common rail from conventional
injection systems)
• High injection pressures and good spray preparations are possible
even at low engine speeds and loads.
• Capability to deliver stable, small pilot injections can be used for
decreased NOx emissions and noise.
• Option for post injections may be used together with such emission
control technologies as particulate filters, lean NOx catalysts, or NOx
adsorbers.
• Fuel pump operates with low drive torque.
ENGINE DEVELOPMENT LABORATORY
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34. CONTENTS
Introduction completed.
System types & Generation
Common Rail & emission strategy
System Validation & tests
Project milestones
ENGINE DEVELOPMENT LABORATORY
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