New tech prom­ises re­duced emis­sions and diesel use

New Zealand Truck & Driver - - Front Page -

TRUCK EN­GINE MAN­U­FAC­TURER CUM­MINS HAS linked with an Amer­i­can tech­nol­ogy com­pany to suc­cess­fully cut diesel en­gine ex­haust emis­sions and fuel con­sump­tion – us­ing cylin­der de­ac­ti­va­tion con­trol soft­ware.

Cum­mins and Tula Tech­nol­ogy say that they have used diesel Dy­namic Skip Fire (dDSF) to achieve “sig­nif­i­cant re­duc­tions in emis­sions and fuel con­sump­tion.”

The project started early last year, with the goal of op­ti­mis­ing the Dy­namic Skip Fire (DSF) tech­nol­ogy that has made Tula “a tech leader in im­prov­ing propul­sion ef­fi­ciency and re­duc­ing emis­sions in pas­sen­ger cars” – aim­ing to achieve the same re­sult for trucks and buses.

The joint de­vel­op­ment team mod­i­fied the en­gine sys­tem to in­te­grate and lever­age Tula’s DSF con­trol al­go­rithms to com­mand com­bus­tion or de­ac­ti­va­tion on a cylin­der event ba­sis.

The two com­pa­nies say that con­tin­u­ing de­vel­op­ment of the pro­gramme is ex­pected to help ad­dress fu­ture, more stringent NOx (ox­ides of ni­tro­gen) diesel en­gine ex­haust emis­sions reg­u­la­tions.

The tech­nol­ogy achieves the NOx re­duc­tion pri­mar­ily by op­ti­mised ex­haust tem­per­a­ture con­trol, re­sult­ing in dra­mat­i­cally im­proved con­ver­sion ef­fi­ciency of the af­tertreat­ment sys­tem. The tech­nol­ogy achieves CO2 re­duc­tions through im­prove­ments in com­bus­tion and re­duc­tions in pump­ing work.

Cum­mins’ di­rec­tor, ad­vanced sys­tem in­te­gra­tion, Lisa Far­rell, says: “At Cum­mins, it’s our mis­sion to power a more pros­per­ous world. We do this by help­ing cus­tomers suc­ceed through in­no­va­tive and de­pend­able prod­ucts that are good for the cus­tomer and the en­vi­ron­ment.

“We will con­tinue to in­no­vate the diesel en­gine sys­tem to make it lighter, more re­li­able, pow­er­ful and fuel-ef­fi­cient, and we are en­cour­aged by the progress demon­strated in this col­lab­o­ra­tion and what it could mean for fu­ture diesel tech­nol­ogy.”

The col­lab­o­ra­tion work was car­ried out on a Cum­mins X15 Ef­fi­ciency Se­ries 6-cylin­der diesel en­gine, which Cum­mins says al­ready offers classlead­ing fuel econ­omy.

It was op­er­ated us­ing the “chal­leng­ing” low-load test cy­cle cur­rently be­ing pro­posed by the Cal­i­for­nia Air Re­sources Board – whereby emis­sions are tested dur­ing sus­tained low-load en­gine op­er­a­tion, which CARB says “con­sti­tutes a large frac­tion of how trucks ac­tu­ally op­er­ate in ur­ban ar­eas.”

Modelling of dDSF tech­nol­ogy pre­dicted re­duc­tions in NOx emis­sions while si­mul­ta­ne­ously re­duc­ing CO2.

Tula Tech­nol­ogy pres­i­dent and CEO R. Scott Bai­ley says that the part­ner­ship with Cum­mins “has given us the op­por­tu­nity to ex­pand our DSF tech­nol­ogy be­yond its suc­cess in gaso­line en­gines.

“Demon­strat­ing the ca­pa­bil­ity to im­prove fuel ef­fi­ciency while also achiev­ing very ef­fec­tive emis­sions con­trol is ex­tremely im­por­tant for all diesel en­gine ap­pli­ca­tions in the fu­ture.”

The col­lab­o­ra­tion plans to ex­plore fu­ture sys­tem op­ti­mi­sa­tion and vi­a­bil­ity to con­trol noise, vi­bra­tion and harsh­ness in com­mer­cial ve­hi­cle ap­pli­ca­tions.


The cylin­der de­ac­ti­va­tion con­trol soft­ware has been de­vel­oped us­ing a Cum­mins X15 Ef­fi­ciency en­gine, which the en­gine­maker says is al­ready “class-lead­ing” in its fuel econ­omy

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