3. Introduction
• The country among other things has seen an
enormous development in engines used in
cars also.
• The Diesel engines have also undergone a sea
change from the time Rudolf Diesel invented it
way back in 1892.
• Today Common Rail Direct Injection (CRDI) is
the order of the day.
5. Principle
• Unlike in conventional diesel engines, the fuel is fed
into the common tube or rail and high pressure is
maintained.
• This allows fuel to combine with air much more
efficiently.
• It features high-pressure fuel rail feeding individual
solenoid valves as opposed to low-pressure fuel
pump feeding injectors.
7. Working
• Solenoid valves make possible fine electronic
control over the injection time and amount, and
the higher pressure that the common rail
technology makes available provides better fuel
atomization. In order to lower engine noise, the
engine's electronic control unit can inject a small
amount of diesel just before the main injection
event ("pilot" injection), thus reducing its
explosiveness and vibration, as well as optimizing
injection timing and the process continues
8. Features
• Direct injector
• Spiral-shaped intake port
• Integrated port
• Air flow metering
• Multiple Pilot injection and Post
injection
• Powerful Microcomputer
• Newly-developed catalytic
converters
• Reduced noise levels
11. Integrated port
Integrated port is used for exhaust gas recycling.
There are three advantages to this system
• eliminates external pipes which are subject to
vibration
• quicker engine warm-up
• better combustion.
12. Air flow metering
• It gives exact analysis of the air-mass that is being
taken in.
• Due to this metering system, the microcomputer that
controls engine timing receives precise data.
13. Multiple Pilot injection and Post injection
• Pilot injections is small doses of fuel made prior to
the main injection which help to smoothen the sharp
combustion character.
• Post injection is a similarly small dose of fuel injected
after the main injection to reduce particulates.
14. Powerful Microcomputer
• The microcomputer regulates the amount of time
the valves stay open and thus the amount of fuel
injected, depending on operating conditions and
how much output is needed.
15. Newly-developed catalytic converters
• Besides electronically-controlled exhaust-gas
recycling which contributes to lower nitrous oxide
emissions, CRDI engines are equipped with catalytic
converters near the motor and emission control
devices on the underbody. These vouch for a high
degree of efficiency.
16. Reduced Noise levels
• The Electronic control and multiple injections
reduced noise to a great extent
17. Scope for further development
• Use of different fuels for zero emissions and
better engine performance
• By using different fuels and cetane improvers,
maximum torque can be obtained
• Lowering the cost
• Closed-loop control injection with ion sensing
technology
19. Advantages
-More power is developed
-Increased fuel efficiency
-More stability
-Pollutants are reduced
-Particulates of exhaust are reduced
-Exhaust gas recirculation is enhanced
-Precise injection timing is obtained
-Pilot and post injection increase the combustion
quality
-The powerful microcomputer makes the whole
system more perfect
20. Manufacturers of CRDI engine
The car makers refer to their common rail
engines by their own brand names. Some of
them are
BMW's D-engines
Mahindra's CRDe
Tata's DICOR
Honda's i-CTDi
Hyundai-Kia's CRDi etc
21. References
• International Journal of Automotive Technology
• Approaches to Automotive Emissions Control
• Magazines: Auto week, Automobile India
