After several years of field testing, Volvo Buses will now commence series production of its hybrid bus Volvo 7700 Hybrid and the double-decker Volvo B5L Hybrid. (Earlier post.) The hybrid bus will reduce fuel consumption by up to 35% and carbon emissions by an equal amount.
The 12-meter Volvo 7700 Hybrid bus is now being built in the company’s plant in Wroclaw, Poland and the chassis for the double-decker Volvo B5L Hybrid will be built in Borås, Sweden. The coaches for the double-deckers will be built by Wrightbus in Northern Ireland.
Volvo’s hybrid buses have a downsized diesel engine and an electric motor that can operate the bus independently or jointly. When the bus brakes, the brake energy is utilized and stored in a battery, which then drives the electric engine when the bus accelerates again.
With Volvo’s parallel technology, the engine switches off automatically at bus stops. The bus then restarts only with the help of the electric engine. The diesel engine does not start until the bus reaches 15-20 km/hour. This gives a quiet and exhaust-free environment at bus stops.