Electric braking system for a road vehicle, with all-electric control

Abstract

The invention provides an electric braking system for a road vehicle equipped with wheels (1) having all-electric control, these wheels each being rotationally connected to at least one rotating electric machine (2) specific thereto, an electronic wheel control module (23) which controls the electric machine or machines of one and the same wheel, each electronic wheel control module making it possible to selectively impose on the wheel in question a defined control torque in terms of amplitude and sign, such that the wheel in question imposes on the vehicle a driving force or a braking force according to said defined control torque, the system comprising a central processing unit (3) which manages the movement of the vehicle, said central processing unit (3) controlling all the electronicwheel control modules (23),; said central processing unit having a vehicle braking operating mode activated by a vehicle braking control signal having a given amplitude representative of the total braking force desired for said wheels having all-electric control, wherein, in the braking mode, whatever the amplitude of the braking control signal, said central processing unit controls all the electronic wheel control modules such that the sum of the longitudinal forces of all the wheels is a function of said amplitude of the braking control signal, which function is, for example, proportional in the simplest implementation.

Description

technical field [0001] The present invention relates to road vehicles, and in particular to braking systems for road vehicles using electric traction. Background technique [0002] Electric vehicles include vehicles in which the electrical energy required to make it move is stored in batteries and vehicles in which electrical energy is generated on board by a heat engine driving a generator or by a fuel cell. Vehicle traction is ensured by one or more electric motors. Vehicle braking is ensured by a conventional mechanical braking system, which is sometimes assisted electrically. [0003] In this case, since the electric machine is reversible, it can also act as a generator during the braking phase of the vehicle, where the mechanical braking energy can be converted, optionally by heat dissipation, into electrical energy to be absorbed by the vehicle. This mode of operation is commonly referred to as "electrical braking" or "regenerative braking". [0004] Many vehicles u...

AI Technical Summary

Problems solved by technology

[0007] However, in the case of electric traction vehicles, there is still a risk in doing away with mechanical brakes, as electric braking obviously needs to be powerful enough, and extremely reliable, not to make the vehicle or even the wheels heavier

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