Hydraulic retarding control system

• Main Authors: CHEN, Dayao, ERDMAN, William F, MATE, Edward W
• Format: Patent
• Language: English
• Published: 02.02.2023
• 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; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; SOIL SHIFTING; 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).