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About drivelines
 
In order to better explain position of the VOLUMTRAN technology relating to the modern hybrid driveline technologies, especially for those that are not expert in domain, short introduction about main driveline function(s) will be given. 

Briefly, main function of the driveline is to transfer the energy from the engine to the wheels, allowing control of the energy transfer conditions. Or, in other words one can control speed of the car controling the driveline. In standard solutions this is realised by the driver control of the engine, clutch and transmission box.

Standard drivelines
 
In this introduction standard driveline is seen as the solution to transfer the energy, from the engine to the wheels, with limited possibility to optimise overall working conditions.

Standard driveline connects directly engine and wheels by the mechanical connection unable to store/restore the energy. Freedom of the power management is limited. Only available optimisation strategy relates to the variation of the transmission ratio between engine and wheels. This can allow the engine to work in the area of rotational speed that will offer max efficient for given wheels/car speed. More transmission ratios will offer more efficiency, with the continuous variable transmission as the best option. Energy developed by the engine is directly consumed by the transmission.

Modern hybrid drivelines
 
On the contrary to standard drivelines, modern hybrid drivelines, with their capability to store/restore the energy, can provide much higher level of the optimisation of the overall working conditions, resulting with better overall fuel efficiency.


All modern hybrid drivelines are equipped with at least one energy buffer. This energy buffer is used to store the energy when it is available and can’t be consumed instantly. This will allow different strategies of the power management with aim to optimise overall performance of the driveline. With modern hybrid drivelines there is a lot potential regarding advanced power management aimed to improve car fuel efficiency and reduce environmental impact. Most interesting impact of the modern hybrid drivelines can be obtained through:

Braking:
Instead losing a car kinetic energy through the brakes, great part of the cars kinetic energy will be stored in the energy buffer through the regenerative braking.
 
Acceleration:
The energy stored in the energy buffer is used during acceleration of the vehicle so less fuel will be consumed in stop&go situations.
 
 
Engine at optimal efficiency:
Internal combustion engines can achieve high efficiency but only in the vicinity of certain, optimal, area of load and rotating speed. Working outside of the optimal area, efficiency will be reduced. Briefly, hybrid drive allows engine to work in/close to the area of the best efficiency and all energy that can’t be instantaneously consumed, by the car, will be stored in the energy buffer. Equally, if demand for the energy is higher than engine can produce, with sufficient efficiency, some part of the needed energy can be provided from the energy buffer allowing to the engine continuous work near point of the max efficiency, improving overall efficiency.
 
 
Optimal engine sizing:
In most automotive applications there is big difference between energy needed for continuous operation and energy needed to cover max. energy demand. Using energy from the energy buffer max. energy demand can be meet with the smaller engine. Smaller engine can be more optimised according to the energy demands needed for the continuous operation and by this further improvement of the overall efficiency can be obtained.
 

VOLUMTRAN project will provide all benefits of modern hybrid drivelines.