Cummins ready for Euro 6
Available from 150 to 310 ps, the ISB engines are available for single- and double-deck buses and coaches, and are tailored for European vehicle design and operations. The successful certification is a result of a three-year ISB Euro 6 development programme, which included proving they operate successfully in extreme hot and cold climates. Engineers carried out more than 30,000 km of product validation in Spain and Scandinavia to ensure emissions compliance. Ambient temperatures ranged between 35C and -29C during the tests, which also took the vehicles to altitudes of more than 2,000m.
“Our testing has successfully validated Cummins’ hardware and control strategy for Euro 6 in extreme temperatures,” says Jonathan Atkinson, chief engineer of product development. “It has proven that the upgraded Euro 6 OBD system would not generate unnecessary fault codes that could limit vehicle operation in these difficult climates. This has been an important step in our development programme, ensuring that Cummins’ Euro 6 package delivers for all vehicle users, wherever they operate.
“The testing involved advanced telemetry, measuring and recording more than 1,300 engine and vehicle parameters on a real time basis. Engineers were able to send data via GSM equipment back to the Darlington Technical Centre every hour for review and analysis by functional specialists. After validating findings and identifying solutions in the lab, the test team were then able to make focused adjustments and modifications to the engine and aftertreatment system to further optimise performance.”
Neil Pattison, director – automotive engine business for Europe, Middle East and Africa, says: “Our technology choice coupled with our installation support expertise has enabled us to work closely with our customers to deliver the best possible solution. This has put Cummins in an excellent position to take advantage of growth opportunities at Euro 6.”
And mindful of the recent interest in gas, Cummins Euro 6 ISL G natural gas engine is due to be certified in October. The 8.9 litre engine will be available from 250 to 320ps for alternative fuel bus applications, with a peak torque of 1,356Nm.
The ISL G uses a combination of cooled Exhaust Gas Recirculation (EGR) with stoichiometric combustion. Cummins says cooled EGR lowers combustion temperatures and reduces engine out emissions and noise. Stoichiometric combustion, where fuel is burned completely, ensures an oxygen-free exhaust and enables the use of maintenance-free, three-way catalyst technology.
John Burgess, general manager for Cummins gas engine business, says: “Our expectation is that the ISL G will benefit our customers in helping them to provide a quiet, ultra-clean bus which will deliver benefits to the operator, the travelling public and the environment.
“The engine can run on compressed and liquefied natural gas or bio methane, which is renewable natural gas, made from biogas or landfill gas and upgraded to vehicle fuel quality.
“We have an additional challenge to complete the Euro 6 certification of our gas engines. The legislation includes a requirement to be able to measure ammonia emissions, given the need for Adblue-injected SCR systems with diesel engines. Due to the ultra-clean nature of natural gas products, only a three way catalyst aftertreatment is needed, with no SCR Adblue injection required. Cummins are working with the authorities to clarify this and enable certification of the ISL G.”