REDUNDANT HARDWARE ARCHITECTURE FOR THE POWER STAGE OF THE BRAKING SYSTEM OF A VEHICLE IN WHICH EACH OF THE WHEELS ARE CONNECTED TO AT LEAST ONE ROTARY ELECTRICAL MACHINE

• US 20090272608A1
• Filed: 06/15/2007
• Published: 11/05/2009
• Est. Priority Date: 06/26/2006
• Status: Active Grant

• Current Assignee: Compagnie générale des établissements Michelin
• Original Assignee: Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Inventors: Bourqui, Gerard, Linda, Jean-Louis, Cudre-Mauroux, Fabrice
• Granted Patent: US 8,449,049 B2
• Time in Patent Office: Days
• US Class Current: 188/160
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2220/44 Wheel Hub motors, i.e. integrated in the wheel hub
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 3/003 relating to inverters
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/40 for controlling a combination of batteries and fuel cells
• CPC Class Codes: B60L 7/006 Dynamic electric braking by reversing current, i.e. plugging
• CPC Class Codes: B60L 7/12 for vehicles propelled by dc motors
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: B60L 7/22 Dynamic electric resistor braking, combined with dynamic electric regenerative braking
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An electric braking system is provided for a road vehicle that includes at least two wheels (1) each connected for rotation to at least one rotary electric machine (2), with each rotary electric machine (2) cooperating with a single wheel; and at least one electronic wheel control module (23) controlling an electric machine of a corresponding wheel, with each electronic control module enabling a control torque of determined amplitude and sign to be imparted selectively to a corresponding wheel, such that the corresponding wheel imparts to the vehicle a drive force or a braking force in accordance with the control torque. The electric braking system includes at least two sub-systems (A and B) connected to a central electric line (40). Each of the sub-systems includes:

• • a part of the wheels (1),
  • the electronic control modules associated with each wheel of the part,
  • a dissipation device controlled by an electronic dissipation module (60A, 60B), and
  • an overcurrent protection device (41A, 41B) capable of electrically isolating the sub-system from the central electric line.

Claims

1. An electric braking system for a road vehicle that includes:

at least two wheels (1) each connected for rotation to at least one rotary electric machine (2), with each rotary electric machine (2) cooperating with a single wheel; and

at least one electronic wheel control module (23) each controlling an electric machine of a corresponding wheel, and each electronic wheel control module enabling a control torque of a determined amplitude and sign to be imparted selectively to a corresponding wheel, such that the corresponding wheel imparts to the vehicle a drive force or a braking force in accordance with the control torque, wherein the electric braking system comprises at least two sub-systems (A and B) connected to a central electric line (40), each of the sub-systems including;

a part of the wheels (1),

the electronic control modules (23) associated with each wheel of the part,

a dissipation device controlled by an electronic dissipation module (60A, 60B), and

an overcurrent protection device (41A, 41B) for electrically isolating the sub-system from the central electric line (40).

2. A vehicle braking system according to claim 1, wherein the vehicle includes four wheels each connected for rotation to at least one rotary electric machine (2) specific thereto, and wherein each of the at least two sub-systems includes two of the four wheels.

3. A vehicle braking system according to claim 2, wherein each of the at least two sub-systems groups together the four wheels of the vehicle disposed diagonally at opposite corners of the vehicle.

4. A system according to claim 1, wherein the dissipation device includes an electrical dissipation resistor (6).

5. A system according to claim 1, wherein the vehicle has a mass of M kg, and wherein the dissipation device is of a power greater than 250*M/1000 kW per sub-system.

6. A system according to claim 1, wherein each of the at least two sub-systems (A and B) is connected to the central electric line (40) by a corresponding overcurrent protection device (41A, 41B), and wherein means for supplying electrical energy is connected to the central electric line (40).

7. A system according to claim 1, wherein an electrical energy storage device is connected to the central electric line (40) by an electronic regeneration module.

8. A system according to claim 1, wherein the system forms a self-contained electrical system isolated from an environment of the vehicle, with no exchange of electrical power with a unit external to the vehicle.

9. A system according to claim 1, further comprising a central unit (3) for ensuring management of a vehicle longitudinal displacement, the central unit (3) controlling all of the electronic wheel control modules (23), the central unit (3) having a vehicle braking operating mode activated by a vehicle braking control signal of a given amplitude representative of a total braking force desired for the vehicle and in which, in a braking mode, at whatever amplitude of the braking control signal, the central unit (3) controls all of the electronic wheel control modules (23) in such a way that a sum of longitudinal forces of all of the wheels (1) originating from the rotary electric machines is a function of the amplitude of the braking control signal.

10. A system according to claim 1, wherein no mechanical service brake is included.