11-01-2014, 11:28 AM
CRDI TECHNOLOGY
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CRDI ?
CRDI stands for Common Rail Direct Injection meaning, direct injection of the fuel into the cylinders of an engine via a single, common line, called the common rail which is connected to all the fuel injectors.
Instead of providing separate piston pumps for fuel supply, the common rail alone supplies high pressure fuel to each cylinder.
HISTORY
Common rail system was first developed in 1960 by Robert Huber and further it is developed by Dr. Marco Genser.
Denso corporation claims the first commercial high pressure common rail system in 1995.
Later the design was acquired by Robert Bosch Gmbh and made a complete development for mass production.
The first passenger car to use common rail system was 1997 model Alfa Romeo 156.
TECHNOLOGY USED
In this system the mechanical controls are replaced by electronic controls to allow for more precise metering and timing of the fuel delivery into the engine.
The individual injectors are replaced by 1 (or 2) "common rail" which operates under a constant high pressure.
The timing and fuel quantity is controlled by an advanced engine management system which gathers data on the engine conditions via a collection of sensors.
PRINCIPLE OF CRDI GASOLINE ENGINES
Gasoline engines were using carburetors before the introduction of MPFI systems.
A new technology has been introduced, i.e. GDI systems.
This system uses the principle of CRDi technology.
ELECTRONIC CONTROL UNIT
ECU monitors Engine variables such as Temperature , intake pressure , RPM , air mass intake and demand for power (from accelerator) and provides real time control.
It modifies injection pressure precisely as needed , based on data obtained from cam and crankshaft.
CHARACTERSTICS
Spiral shaped Intake port – Induces optimum swirl in the air intake.
Integrated port at cylinder head for exhaust gas recycling – Builds up input air temperature.
Unique inlet port – Uses 2 spiral intake ports.
Dual mass flywheel – Compensates the harmonic effect on power train elements.
CRDI FUTURE TRENDS
Ultra-high pressure common-rail injection (1800 bar) – Generates ideal swirl in the combustion chamber.
CRDi and Particle Filter - To reduce particle emissions from exhaust.
CRDi and closed-loop control injection - Using ion sensors to provide real-time combustion data.
CONCLUSION
Cuts fuel consumption by 20% due to a more synchronized timing operation.
Increases power by 25%.
It also brings a significant reduction in NVH controls.
Revolutionalized both diesel and petrol engines.
CRDi represents a further step in evolution of fueling systems.