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US 10,704,685 B2Granted
Hydraulic-assistance system for open-circuit motor vehicles
AssigneePoclain Hydraulics Industrie
InventorsAndre Prigent, Cyrille D'Hersignerie
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AssigneePoclain Hydraulics Industrie
InventorsAndre Prigent, Cyrille D'Hersignerie
Estimating the term…
The present invention relates to a hydraulic-assistance system for motor vehicles, comprising a primary motor (M) and two hydraulic machines (140; 240, 250) connected by a hydraulic circuit such that when a first hydraulic machine (140) operates as a pump, the second hydraulic machine (240, 250) operates as a motor. The invention is characterized in that the hydraulic circuit connecting the two machines (140; 240, 250) is an open circuit passing through a tank (300), the hydraulic machine (240, 250) operating as a motor is a declutchable machine, and the hydraulic machine (140) operating as a pump is a pump in which the variable displacement is controlled by a device comprising a proportional pressure limiter (470) placed between a drain line (143) and the discharge line of the hydraulic machine (140) operating as a pump, and enabling the assistance pressure to be set, and at least one collection nozzle (460) placed between the proportional pressure limiter (470) and the discharge line of the hydraulic machine (140), the setpoint pressure controlling the hydraulic machine (140) operating as a pump being collected between the pressure limiter (470) and the collection nozzle (460).
A hydraulic assistance system for motor vehicles, comprising a primary motor (M) and, a variable displacement hydraulic pump and a first declutchable hydraulic motor, wherein the hydraulic pump and the first hydraulic motor are connected by an open hydraulic circuit running through a reservoir (300), wherein a proportional calibration pressure limiter (470) is between a drain line (143) and a discharge line of the hydraulic pump, with at least one collection restriction (460) interposed between the proportional calibration pressure limiter (470) and the discharge line of the hydraulic pump (140), a set pressure collected between the pressure limiter (470) and the collection restriction (460) controls the displacement of the hydraulic pump, wherein said system comprises a pressurization valve (440) for controlling the pressure in a casing of the first hydraulic motor in a freewheel mode interposed between a drain line (246, 256) originating from the casing of the first hydraulic motor and the reservoir (300) and a restriction (450) positioned in series with the pressurization valve (440) to allow a pressure increase in the casing of the first hydraulic motor.
A hydraulic assistance control method for motor vehicles implementing a primary motor (M), a variable displacement hydraulic pump and a first declutchable hydraulic motor, wherein the hydraulic pump and the first hydraulic motor are connected by an open circuit running through a reservoir (300), and comprising a step of collecting a set pressure from between a proportional calibration pressure limiter (470) and at least one collection restriction (460), wherein the proportional calibration pressure limiter (470) is between a drain line (143) and a discharge line of the hydraulic pump and the at least one collection restriction (460) is between the proportional calibration pressure limiter (470) and the discharge line of the hydraulic pump (140), wherein the set pressure is used to control the displacement of the hydraulic pump, and a pressurization valve (440) is between the reservoir (300) and a casing drain line (246, 256), connected to a casing of the hydraulic motor, with a restriction (450) in series with the pressurization valve (440), to increase a pressure in the casing of the hydraulic motor.
Dependencies are inferred from the claim text.