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1. WO1999003770 - INTEGRATED CONTROL FOR ELECTRIC LIFT TRUCKS

Publication Number WO/1999/003770
Publication Date 28.01.1999
International Application No. PCT/CA1998/000701
International Filing Date 17.07.1998
Chapter 2 Demand Filed 18.02.1999
IPC
B66F 9/20 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
66HOISTING; LIFTING; HAULING
FHOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
9Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
06movable, with their loads, on wheels or the like, e.g. fork-lift trucks
075Constructional features or details
20Means for actuating or controlling masts, platforms, or forks
CPC
B60Y 2200/15
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
2200Type of vehicle
10Road Vehicles
15Fork lift trucks, Industrial trucks
B66F 9/0759
BPERFORMING OPERATIONS; TRANSPORTING
66HOISTING; LIFTING; HAULING
FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
9Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
06movable, with their loads, on wheels or the like, e.g. fork-lift trucks
075Constructional features or details
0759Details of operating station, e.g. seats, levers, operator platforms, cabin suspension
B66F 9/20
BPERFORMING OPERATIONS; TRANSPORTING
66HOISTING; LIFTING; HAULING
FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
9Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
06movable, with their loads, on wheels or the like, e.g. fork-lift trucks
075Constructional features or details
20Means for actuating or controlling masts, platforms, or forks
Applicants
  • SOLARIA RESEARCH ENTERPRISES LIMITED [CA]/[CA]
Inventors
  • ADSETT, Robert, T.
  • GADBOIS, Pierre, C.
Agents
  • WOOD, Max, R.
Priority Data
2,210,72718.07.1997CA
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) INTEGRATED CONTROL FOR ELECTRIC LIFT TRUCKS
(FR) COMMANDE INTEGREE POUR CHARIOT ELEVATEUR ELECTRIQUE
Abstract
(EN) A controller system for an electric lift truck that controls a traction motor (86) and a hydraulic pump motor (12) is disclosed. The speed of rotation of both motors (86, 12) is controlled by a pulse width modulated current supplied from a battery source (84) by the controller (80) in direct response to a demand communicated to the controller (80) through an interface (50) manipulated by an operator. A pump (13) driven by the pump motor (12) supplies pressurised hydraulic fluid to a lift mechanism (90) and a power assisted steering unit (17). A priority valve (14) ensures that the pressurized hydraulic fluid first satisfies the power assisted steering unit (17) before being used for other hydraulic functions. A joystick (52) with function switches (56, 58, 60 and 62) is provided so that the operator steers with one hand while controlling truck propulsion and all functions of the lift mechanism (90) with the other hand. The combination of direct control of the pump motor (12) speed and on-demand pressure switch (16) enables a fully proportional control of the hydraulic system. The system provides a compact structure with minimal cabling and ensures that the hydraulic system operates with energy efficiency and minimal wear.
(FR) L'invention concerne un système de commande pour chariot élévateur électrique, qui commande un moteur de traction (86) et une pompe-moteur hydraulique (12). La vitesse de rotation des deux moteurs (86, 12) est régulée par un courant à modulation d'impulsions en durée apporté par le système de commande (80) depuis une source d'alimentation par batterie (84), en réponse directe à une demande transmise audit système de commande (80) par l'intermédiaire d'une interface (50) manipulée par un opérateur. Une pompe (13) commandée par la pompe-moteur (12) apporte un fluide hydraulique pressurisé à un mécanisme élévateur (90) et une unité de guidage asservie (17). Une soupape de priorité (14) permet d'assurer d'abord que le fluide hydraulique pressurisé est adapté à l'unité de guidage asservie (17) avant de l'utiliser pour d'autres fonctions hydrauliques. Un manche de commande (52) muni de sélecteurs de fonctions (56, 58, 60 et 62) permet à l'opérateur d'effectuer le guidage d'une main pendant que l'autre main commande la propulsion du chariot et toutes les autres fonctions du mécanisme élévateur (90). La combinaison de la commande directe de la vitesse de la pompe-moteur (12) et du manostat (16) sur demande permet une commande entièrement proportionnelle du système hydraulique. Le système fournit une structure compacte comportant un minimum de câblage et assure que le système hydraulique fonctionne avec un bon rendement énergétique et une usure minimale.
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