Recuperative braking control method for electric vehicle

• Main Authors: HUERRE BENOIT, LEZY PATRICK
• Format: Patent
• Language: English; French
• Published: 22.12.1995
• Edition: 6
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL

The process is for controlling the recuperative braking of an electric road vehicle which has a motor-generator (6) which uses the electrical energy from on-board batteries (7) to drive at least two wheels (1,2). The motor-generator (6) functions as a generator during deceleration phases of the vehicle and supplies the batteries (7) with charging current resulting from the dissipation of energy during braking. The current flow is controlled by a central control unit (11) which detects the adherence limit of the vehicle from data transmitted from an on-board speed detector (8,9,12). The current is suppressed if the variation in speed dv/dt is less than a first step level S1. The current is progressively re-established to its normal value, when the speed variation dv/dt is greater than a second step value S2 or is greater than a first step S1, during a set time interval Dt or when the end of the braking sequence is detected. Procédé de contrôle du freinage récupératif pour véhicule routier muni d'un actionneur (6) utilisant l'énergie électrique stockée dans des accumulateurs (7) embarqués pour entraîner au moins deux roues motrices (1, 2), et pouvant fonctionner comme un générateur pendant les phases de décélération du véhicule pour débiter aux accumulateurs (7) un courant d'alimentation résultant de la transformation de l'énergie dissipée lors du freinage, caractérisé en ce que le courant débité est contrôlé par une unité centrale de commande (11), détectant la limite d'adhérence du véhicule à partir d'informations transmises par au moins un capteur de vitesse embarqué (8, 9, 12).