AddiDrive(TM) CreepDrive


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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