direct diesel injection system
TRANSCRIPT
By Guided By
Nishikant Bawiskar V.A. Kulkarni
Direct Diesel Injection.
Indirect Diesel Injection.
FIGURE 4–3 An indirect injection diesel engine uses a prechamber and a glow plug.
Indirect Injection Begins In Pre Combustion Chamber.
Initial Combustion Takes Place There.
Slow The Rate And Reduce Noise.
Glow Plug Are Needed To Provide Heat.
FIGURE 4–4 A direct injection diesel engine injects the fuel directly into the combustion chamber. Many designs do not use a glow plug.
Directly Injected Into Cylinder.
The Piston Has Chamber Built In It.
More Reliable Than Indirect Injection.
More Noisy Than Indirect.
Diesel Directly Supplied to Cylinder.
Injectors Exposed To Heat And Pressure.
The Piston Has Chamber Built In It.
The Entire Intake Is Dry, Makes This A very Clean System.
Ignition occurs in a diesel engine byinjecting fuel into the air charge, which hasbeen heated by compression to atemperature greater than the ignition pointof the fuel or about 1000°F (538°C).
System Prototype Was Developed In 1960 By Robert Huber.
Technology Was Developed By Dr. Marco Ganser In 1995.
Dr. Shohei Itoch Developed The Direct Diesel Injection System.
The DDis Engine Was First Mounted On Hino Rising Ranger Truck.
Denso Claims The First Commercial High Pressure Direct Diesel System In 1995.
Solenoid Or Piezoelectric Valves Make Possible Fine Electronic Control Over The Fuel Injection Time And Quantity.
It Provides Better Fuel Atomization.
In Order To Reduce Engine Noise, Engine’s ECU Can Inject Small Amount Of Just Before The main Injection.
This Reducing Its Explosiveness And Vibrations.
As Well As It Optimize injecting Timing And For Variations In Fuel Quality.
DDis Engine Require Very Short (<10 Seconds) Or No Heating Time.
Nozzle Is Open And Closed With Needle Valve, Operated With Solenoid.
When Solenoid Is Not Activated , The Spring Forces The Needle Valve Into Nozzle Passage And Prevents Injection.
The Solenoid Lifts the Needle valve From Cylinder Seat , And Fuel Under Pressure Is Sent In The Engine Cylinder.
The Third Generation engines use Piezoelectric Injector For Increased Precision.
Low Emission.
High Fuel Efficiency.
The Engine Is Smooth And Responsive.
Lower Fuel Consumption-20%.
High Volumetric Efficiency.
Pressure Rise Can Be Very High.
Knocking At High Injection Pressure.
High quality Fuel Required.
More Noise than Indirect Injection.
Used In Marine And Locomotives Machines.
Used In All Types Of Road Cars With Diesel Engines.
Also Used In Stationary Engines.
Ashok Leyland- CRS Engines In U Truck And E4 Busses.
BMW- D Engines.
Daimler- CDI And CRD Engines.
Fiat- JTD, Multijet, TiD, Ttid, Ddis.
Mitsubishi- DI-D.
1.3 Litre DDis Technology.
Maximum Power Of 75 HP.
Fuel Consumption Is 67.3 mpg.
Acquires 0-62 mph In 12.7 Seconds.
