Hybrid bus which runs on both liquid nitrogen and diesel completes series of tests

Hybrid bus which runs on both liquid nitrogen and diesel completes series of tests

The CE Power Bus is claimed to have a longer life than current battery technology and also eliminates any sort of emissions below 20mph.

The hybrid bus which runs on both liquid nitrogen and diesel has been undergoing a series of testing to edge the production of the vehicle onto British roads a step closer.

The vehicle itself is known as “CE Power” and was built by Horiba Mira as part of an Innovate UK consortium and has laid claim to be the world’s first liquid nitrogen powered hybrid.

The Innovate UK consortium was led by Dearman but also included many other organisations such as Air Products, Cenex, Coventry University, Manufacturing Technology Centre, Productiv Ltd, TRL (Transport Research Laboratory) and Horiba Mira.

How it works

The bus uses a hybrid propulsion system to reduce emissions during acceleration after stopping. This portion of the drive cycle traditionally has a heavy impact on the diesel engine and can produce vast amounts of nitrogen oxide and carbon dioxide emissions. The CE Power Bus’s Dearman engine produces none of these harmful emissions.

While travelling at 20mph or below, the liquid nitrogen – stored in a low pressure insulated cylinder – is warmed up to the point of boiling, at which time it creates enough pressure to drive the multi-cylinder engine. Once the bus reaches 20mph, the diesel engine will kick in, as at this speed the bus requires less effort from the engine to operate.

Martin Watkinson, Technical Lead on the project at Horiba Mira, said: “The hybrid nature of CE Power Bus demanded a sleek systems integration process. Our engineers worked to ensure the liquid nitrogen system operates seamlessly and safely with the diesel engine, in addition to carrying out the whole vehicle thermodynamics modelling and the overall vehicle control and testing.

“The completion of these trials paves the way for the use of liquid nitrogen more widely in the automotive sector, and takes the UK one step closer to stamping out harmful emissions for good.”