![]() Usually, the Diesel engine chosen for a particular application will have sufficient power to cater for all needs. Like most mechanical devices, engine efficiency increases as a function of power demand or load. Starting from rest is initially by electric motor only and the Diesel engine is started automatically according to vehicle road speed and driver acceleration demand (indicated by the accelerator position). When coming to rest the Diesel engine is automatically switched off. The electric traction motor under overrun conditions or vehicle braking functions as a generator and the kinetic energy of motion is converted to electrical energy to charge the traction batteries. This is achieved in three important ways: It brings outstanding benefits both in ease of driving and in fuel economy savings of up to 30%, depending on mission, compared to conventional power train solutions. ![]() ![]() With traction either wholly by electric motor, wholly by Diesel engine or by a combination of the two, what appears at first sight to be a compromise is nonetheless an exciting innovative solution. Where the vehicle is required to leave the city, where range and performance are key operational needs, the Diesel-electric hybrid drive provides an excellent solution. For vehicles that live and work in the city and never leave, pure electric traction provides excellent benefits, for the operator and for society as a whole.
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