Cummins unveils new low-emissions engine

Cummins has launched its latest B6.7 Performance Series, which the off-road engine maker says meets EU Stage V standards by delivering near-zero emission levels of NOx (nitrogen oxides) and PM (particulate matter).
Ancillary Equipment / April 5, 2021
By Liam McLoughlin
  The B6.7 engine is suitable for crushers, screeners, wheeled loaders and excavators
The B6.7 engine is suitable for crushers, screeners, wheeled loaders and excavators

The US-headquartered manufacturer adds that the engine also features stop-start capability which can help operators further reduce running costs, as well as their environmental impact, through lower noise and CO2 emissions.

The engine is suitable for use in a range of off-road equipment including crushers, screeners, wheeled loaders, excavators, fork-lift trucks, terminal tractors and empty container handlers.
Jeremy Harsin, Cummins off-highway business director, said: “Stop-Start capability is included in the B6.7 to further cut fuel consumption as well as overall maintenance costs. Fuel savings should be between 5 and 10% but could be higher based on the machine duty cycle. This feature also delivers the sociability benefits that contractors are looking for by reducing on-site noise and exhaust emissions. Improving fuel efficiency reduces CO2 greenhouse gas emissions.”
Cummins says that stop-start has been integrated into the B6.7 platform with both hardware and software changes. Specially developed bearings in the engine, along with upgrades to the flywheel ring gear and starter motor, are designed to ensure long life and reliable performance with frequent starts.
The company ads that its engineers work closely with the OEM customer to integrate the engine electronic control module (ECM) software with the OEM’s machine controller software. The OEM controller monitors the machine operation and communicates to the ECM when it is appropriate and safe for the machine to shut off.

The ECM monitors engine parameters such as coolant temperature, intake manifold temperature, engine load, and fan operation to make sure it is safely able to shut down. When all criteria are met, the engine will stop. The machine controller will then request an engine restart when required, and the ECM automatically restarts the engine to continue working.
“Many machines sit idling on construction sites for long periods in between tasks. Stop-Start not only reduces running costs, it lowers running hours for the machine, helping maintain higher residual values,” added Harsin.
The 6-cylinder B6.7 engine is available from 116-243 kW (155-326 hp) with a high peak torque of 1375 Nm. With a low weight and compact size, it delivers a high power density that enables it to replace engines of higher displacement with no impact on machine operation. This supports machines needing higher-speed power delivery, with low-end torque capability for transient performance benefits. Equipment manufacturers can use the B6.7 to improve machine capability and offer more value to their customers.

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