As part of the 3 year development programme, Cummins’ Euro 6 ISB engines have successfully completed cold climate testing in Sweden and Norway. Engineers carried out 6,000 kms of product validation in extreme vehicle operating conditions, with ambient temperatures down to -29C.
The 4 week test was carried out with an 18 tonne truck powered by an ISB6.7 and a 12 tonne truck powered by an ISB4.5. Both were instrumented to collect engineering data from the engines, aftertreatment system and other related truck components.
The testing team was based in Kiruna, Sweden, 145 km north of the Arctic Circle, where the average ambient temperature was expected to be -20C. The area has good roads and workshop facilities to support vehicle testing. Typical test routes were in and around the Kiruna area, as well as to Narvik in Norway. Driving conditions on the E10 road to Norway were particularly challenging.
Both vehicles were installed with advanced telemetry which measures and records more than 1300 engine and vehicle parameters on a real time basis. This data was automatically sent 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 on site in Kiruna were then able to make focused adjustments and modifications to the engine and aftertreatment system to further optimise performance in the cold ambient temperatures. The trucks were also left for extended periods to achieve the lowest possible system temperatures, ensuring that every operator’s needs have been considered.
Cold starting was achieved down to -29C with standard hardware, proving that the system is robust in all European operating environments.
Throughout the test Cummins engineering teams monitored the Euro 6 technologies to ensure emissions compliance was maintained in the challenging climate. The aftertreatment system (incorporating Cummins’ DPF and SCR technologies) has to be kept within a specific temperature band to operate efficiently. This is achieved through advanced control strategies which manipulate the engine hardware and combustion strategy to maintain exhaust temperatures in the optimum range whilst maximising fuel efficiency. In addition, urea freezes at -11C, so the capability of the heating system for the Urea tank and delivery system also had to be confirmed. If the SCR catalyst does not achieve the right temperature or Adblue is unavailable the system cannot control NOx emissions and a fault code will be triggered. The test validated the upgraded Euro 6 On-Board Diagnostics system (OBD) ensuring that vehicles working in extreme ambients would not generate faults that could limit vehicle operation.
Jonathan Atkinson, Chief Engineer of Product Development said: “The testing successfully validated Cummins’ hardware and control strategy for Euro 6 in very cold conditions. This is an important step in our development programme which combined with our hot climate work, ensures that our Euro 6 package delivers for all vehicle users, wherever and whenever they operate.”