Overview: an hybrid mechanical/hydraulic transmission dedicated to vehicles driving at normal highway speeds while working at slow speeds between 0 and 10 km/h. In transport mode, the mechanical transmission operates as usual. In "creep mode," the mechanical transmission is de-clutched and the hydraulic transmission is engaged, providing smooth and perfectly controllable ground speeds. Without having to repeatedly modulate the clutch, gear selection and brakes to optimize ground speed, there is less wear on the mechanical drive-train parts, fuel savings, and reduced emissions.
Summary
o The Market
o The Poclain Hydraulics Technical Solution
o Comparison with a Traditional Mechanical Transmission
The Market
AddiDrive(TM) CreepDrive is designed for vehicles that work at very low speeds but travel at normal speeds on-road. The annual accumulated quantities of these vehicles are significant and their environmental impact is real, even if it receives little media coverage. Estimated Quantity in 2006 road striper vehicle (road marking) 1,500 concrete mixer 30,000 sprayer - grit spreader 4,000 street sprayer / cleaner 2,000 rail-road combination vehicle 3,000 airplane de-icing vehicle 1,300 asphalt laying machine 3,000 works inspection vehicle 600 asphalt repair vehicle 1,200 garbage trucks 30,000
Comparison with a Traditional Mechanical Transmission AddiDrive(TM) CreepDrive Traditional Mechanical Transmissions
Pollution / Consumption
No stress on the transmission clutch Large amount of stress on the clutch and brakes at low speeds therefore the emission of particulate matter from the brakes or service brakes
Independence between the speed of the High engine speed at low road speeds lead to a combustion engine and that of the high fuel consumption vehicle speed lead to a reduction in fuel consumption
Noise reduction thanks to constant Noise pollution due to the increases and engine RPM's decreases in engine RPM's
Allows the combustion engine's The combustion engine is sized to operate performances to be optimised at high at both low and high speeds and thus releases speeds, thus reducing losses and more pollution at low speeds. limiting consumption
Safety
Hydrostatic braking, acting as an Friction braking wear integral retarder without using the service brakes or separate retarder
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