Mechanical transmission of power using gears is very energy inefficient. The familiar automotive multi-speed gearbox and differential suffers from the friction losses that result in 20 – 30% of engine power being lost between a car's engine and the wheels. Many techniques are being developed to eliminate mechanical transmission including Wheel Motors and Hydraulic transmissions that we have seen being trialed in UPS delivery vans. Now in an innovative new approach, Scottish company Artemis Intelligent Power has developed a hydraulic hybrid transmission system it says can double a vehicle's MPG in city driving.
Read the full article: New hydraulic hybrid transmission doubles MPG in city driving