DDiS one of the derivatives of Fiat’s multi jet diesel engine, DDiS diesel power plant is probably the most loved and acclaimed diesel engines in the Indian car market today.
Swift’s revival to a great extent, has been all thanks to DDiS technology. Prior to DDiS, diesel power plants available in Indian car market were sluggish and clattery enough to wake up even your neighbours, They were quite an expensive proposition to maintain also. Maruti Suzuki Swift with DDiS engine under its hood changed the Indian car buyers perception towards diesel power plant to a great extent.
DDiS technology consists of following three components:
• Common Rail Injection Mechanism.
• Fixed Geometry/ Variable Geometry Turbocharger.
Common Rail Direct Injection (CRDi)
Fuel injection in Maruti Suzuki’s Swift DDiS is a 5-step process with fuel being injected into the cylinder at around 1400 Bar pressure. The CRDi arrangement features high pressure fuel rail which directly feeds the fuel to the solenoid valves in contrast to old technology using pump to feed individual valves. New generation of common rail now features piezo-electric injectors which results in more precise injection of fuel to increase the fuel efficiency and reduce emission.
Fixed Geometry/Variable Geometry Turbocharger
Depending upon the model, DDiS consists of fixed / variable geometry turbocharger. Swift and Dzire features fixed geometry while in case of SX4 variable geometry turbocharger is on duty. Turbocharger is basically a mechanism to increase the available quantity of oxygen in combustion chamber thus enhancing engine performance. Since they are driven by exhaust gases, there is no extra load on the engine. Once the output of the engine reaches a certain pre-defined level the exhaust gases are fed into the inlet passage so as to increase the available air inside the combustion chamber. More air injected into the engine helps in increasing the engines performance.
Third essential part of DDiS technology is the intercooler. Intercooler helps increase the efficiency of the combustion process. Since the air temperature increases thanks to it being compressed in the turbocharger, this hot air if fed into the combustion chamber would result in before pre-defined time ignition of the air fuel mixture in the chamber – This phenomena is called ‘Detonation’. This before time combustion of air fuel mixture is not only harmful to the engine but it also reduces its overall performance efficiency. Detonation reduces car’s fuel mileage and increases harmful emissions.
The popularity of DDiS it seems is poised to reach new heights as the New Swift Dzire 2012 offers an astonishing mileage of 22.9 Kmpl , which is the highest in its category.