CAR&D

Hybrid

Hybrid Definitions

Energy Ressources

Oil reserves are finite, this has led to the great revolution of the 2000s, the transition to electric and hybrid vehicles.

Pioneers had explored these solutions a century ago, see eg Porsche hybrid in 1900not for the lack of oil, but to combine the qualities of tpetrol engine and electric engine

Hybridization plays on these factors:

Coupling with the vehicle dynamics (published in No. 800 of the SIA)

For reasons of energy, the hybridization is coming quickly into the vehicles. Taking into account the dynamics of the vehicle hybrid propulsion systems (as 2-wheel drive or 4 wheel drive, with or without wheel motors) will be superimposed on the developments of existing systems.

Beyond its essential quality zero emission, the electric motor has the advantage of being more controllable than the internal combustion engine; beyond its function as a substitution or supplementation of propulsion, it can be assigned functions:

In all hybridization solutions, one can access assistance to the acceleration that can enable other functions such as smoothing of the longitudinal acceleration at the gearshift, the fine control of speed.

In the deceleration phases, solutions noble motorization allow energy recovery. Obviously it is interesting to emphasize that regenerative braking from the brake "thermal friction classic. The first is not necessarily effective on all wheels, so it is necessary to couple the two systems.

When seeking to maximize regenerative braking, it is necessary to regulate the reversible electric motor and thus interfere with the ABS hydraulic control.

In solutions containing at least one electric motor backwards, you get recess functions of 4WD, but the controllability of the electric motor can afford to consider distribution functions and variable speed control in descent.

The solution of two rear wheel motors can obtain:

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