HYDRAULIC RETARDING CONTROL SYSTEM

• Main Authors: CHEN, DAYAO, MATE, EDWARD W, ERDMAN, WILLIAM F
• Format: Patent
• Language: English; French
• Published: 09.01.2024
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BLASTING; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL; WEAPONS

A work machine (10) includes an electric drive system. The work machine (10) includes a prime mover (26), a machine controller, and a hydraulic control system (30). The hydraulic control system (30) includes a pump (36), a control valve (32) and a retarding control valve (34). The pump (36) is configured to supply pressurized fluid to the hydraulic control system (30) via a supply line (44). The control valve (32) is fluidly coupled to the pump (36) via the supply line (44), and includes a pressure relief valve (56, 64). The retarding control valve (34) is fluidly connected to the pump (36) and the control valve (32). The retarding control valve (34) includes a solenoid valve (50), an orifice (74) and a check valve (76). The solenoid valve (50) is coupled to the machine controller, the orifice (74) restricts a flow of the pressurized fluid through the supply line (44), and the check valve (76) is coupled to a discharge line (78), which branches from a point along the supply line (44) between the solenoid valve (50) and the orifice (74). Une machine de travail (10) comporte un système d'entraînement électrique. La machine de travail (10) comporte un moteur principal (26), un dispositif de commande de machine et un système de commande hydraulique (30). Le système de commande hydraulique (30) comporte une pompe (36), une soupape de commande (32) et une soupape de commande de ralentissement (34). La pompe (36) est configurée pour fournir un fluide sous pression au système de commande hydraulique (30) par l'intermédiaire d'une ligne d'alimentation (44). La soupape de commande (32) est fluidiquement accouplée à la pompe (36) par l'intermédiaire de la ligne d'alimentation (44) et comporte une soupape de surpression (56, 64). La soupape de commande de ralentissement (34) est fluidiquement accouplée à la pompe (36) et à la soupape de commande (32). La soupape de commande de ralentissement (34) comporte une électrovanne (50), un orifice (74) et un clapet de non-retour (76). L'électrovanne (50) est accouplée au dispositif de commande de machine, l'orifice (74) limite un écoulement du fluide sous pression à travers la ligne d'alimentation (44), et le clapet de non-retour (76) est accouplé à une ligne d'évacuation (78), qui se ramifie à partir d'un point le long de la ligne d'alimentation (44) entre l'électrovanne (50) et l'orifice (74).