TECH­NI­CAL CHAL­LENGES

Auto components India - - EDITORIAL -

The de­ci­sion to ad­vance the sup­ply of BS-VI fuel in NCR from April 2018 to April 2020, shows the proac­tive ap­proach of the Union gov­ern­ment. But tech­ni­cally it is not go­ing to help curb pol­lu­tion as the ve­hi­cle man­u­fac­tur­ers may not be able to develop BS-VI ve­hi­cles in 4 months for NCR alone. They may not roll out BS-VI ve­hi­cles be­fore April 2020 as the ve­hi­cles have to be tested extensively.

At the same time BS-IV ve­hi­cles can­not run on BS-VI fuel, though it may be pre­sumed that its lower sul­phur con­tent will re­duce emis­sions. Tech­ni­cally the ex­ist­ing sys­tem does not al­low it to work in that way. The en­gine will run with BS-VI fuel, but it will af­fect the sen­sors, elec­tron­ics and the ex­haust af­ter treat­ment sys­tems (EATS). For the BS-VI fuel, the elec­tron­ics need to be re­cal­i­brated. Even such changes in the BS-IV ve­hi­cles, will not re­duce emis­sions with BS-VI fu­els. The process to re­duce sul­phur in diesel can af­fect the en­ergy con­tent of the fuel, and re­duce fuel ef­fi­ciency.

The pro­posed BS-VI fuel will limit the amount of sul­phur to 10 ppm from 50 ppm in BS-IV. Nor­mally in the diesel en­gines, the in­jec­tors con­vert the liq­uid diesel to a mist and spray in the cylin­der. If the sul­phur level in the diesel is lower, the in­jec­tors will have in­ter­nal wear and scor­ing. This will re­sult in un­even flow and cause in­cor­rect and in­com­plete com­bus­tion that will in­crease emis­sions. There­fore, to re­duce emis­sion, both the fuel and the ve­hi­cle should be BS-VI.

Fuel qual­ity plays a very im­por­tant role in meet­ing the strin­gent emis­sion reg­u­la­tion. In 2015 In­dia had pledged to cut the in­ten­sity of its car­bon emis­sions by 33-35% by 2030 in the tar­get sub­mit­ted to the United Na­tions Frame­work Con­ven­tion on Cli­mate Change for a global cli­mate pact. To meet this tar­get and com­bat pol­lu­tion, the gov­ern­ment should fol­low a holis­tic ap­proach and phase out old ve­hi­cles and pro­mote hy­brid and elec­tric ve­hi­cles with at­trac­tive fis­cal in­cen­tives.

Hope this is­sue is of spe­cific in­ter­est.

Bhar­gav TS

Ex­ec­u­tive Ed­i­tor s.bhar­[email protected]­pub­lish­ing.net

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