Abstract:
The present invention provides a method of controlling a fluid working machine (12) having a plurality of working cylinders (14) having pistons (16) therein and arranged to drive a shaft (18), in which said cylinders are supplied with pressurised working fluid via a manifold (24), the contents of which may be 5 purged by a de-pressuriser taking one of a number for forms such as to allow re- activation of said machine (10).
Abstract:
A hybrid electro-hydraulic drive system is provided for a vehicle and comprises a hydraulic transmission including a first hydraulic machine and at least one second hydraulic machine drivingly connected to drive wheels of the motor vehicle for driving thereof, an electric motor/generator operatively connected to the first hydraulic machine, and at least one energy storage device operable to store and release a hydraulic fluid energy or an electrical energy. The second hydraulic machine is a reversible hydraulic pump/motor unit capable to function both as a hydraulic pump and a hydraulic motor. The energy storage device is operatively connected to either the hydraulic transmission or the electric motor/generator. In a retarding mode the hydraulic transmission and/or the electric motor/generator retard the vehicle, while in a driving mode they supply a supplementary power to the drive wheels to assist propulsion of the vehicle.
Abstract:
The present invention provides a hydraulic pump (10) for use in driving a load (54) with a control modulation system (9) which modulates a primary control signal in order to accommodate variations in secondary changeable parameters which require control at a higher frequency or have a lower latency.
Abstract:
A hydraulic regenerative braking system and method for a vehicle include a variable displacement hydraulic machine operable as a pump or a motor (22). The hydraulic machine facilitates connections between some of its piston cylinders (50, 52) and a low pressure source (32) , and some other of its piston cylinders (50, 52) and a high pressure source (28). The cylinders are alternately connected to the high and low pressure sources such that a pressure transition occurs during each piston stroke. By controlling where in a piston stroke the transitions occur, the power of the hydraulic machine can be modulated. The hydraulic machine is configured to effect the pressure transitions in only a portion of the cylinders at one time. This can be accomplished by asymmetrically configuring cam lobes (86, 88, 90) and fluid ports (74, 76, 78, 80, 82, 84). Staggering the pressure transitions helps to inhibit flow disturbances in the machine when it is operating at less than full displacement.
Abstract:
The present invention relates to an arrangement for controlling a 5 hydraulically driven motor (2), forming part of a hydraulic system in which hydraulic fluid under pressure forms a main flow through a main duct (1) in which the motor is connected. The motor is adapted to drive a load with varying loading, and one or more valves (6, 7) are adapted for controlling the hydraulic fluid flow through the motor an the one hand during operation and an the other hand for starting and stopping of the motor. One of the valves consists of a flow control valve (7) which is connected in the main duct (1) downstream of the motor (2) and is adapted for an the one hand starting/stopping of the motor and an the other hand constant flow control of the hydraulic fluid flow through the motor.
Abstract:
The present invention provides a hydraulic pump (10) for use in driving a load (54) with a control modulation system (9) which modulates a primary control signal in order to accommodate variations in secondary changeable parameters which require control at a higher frequency or have a lower latency.
Abstract:
A hydraulic regenerative braking system and method for a vehicle include a variable displacement hydraulic machine operable as a pump or a motor. The hydraulic machine facilitates connections between some of its piston cylinders and a low pressure source, and some other of its piston cylinders and a high pressure source. The cylinders are alternately connected to the high and low pressure sources such that a pressure transition occurs during each piston stroke. By controlling where in a piston stroke the transitions occur, the power of the hydraulic machine can be modulated. The hydraulic machine is configured to effect the pressure transitions in only a portion of the cylinders at one time. This can be accomplished by asymmetrically configuring cam lobes and fluid ports. Staggering the pressure transitions helps to inhibit flow disturbances in the machine when it is operating at less than full displacement.
Abstract:
The invention relates to a drive device (10) which has small dimensions in an axial and radial direction. The small dimensions of said device are a result of the brake body (202) of a friction brake (200) provided in the drive device being located at least partially within an enclosure (111) configured in the rotor (108).
Abstract:
L'invention concerne une machine hydraulique (100) à pistons radiaux (122), comprenant: - un carter (110), - un arbre (130), - une came (114) multilobe, - un distributeur (140) et un couvercle de distributeur (112), - un bloc-cylindres (120), ledit bloc cylindres (120) comprenant des moyens d'engagement en rotation (150), la machine hydraulique (100) comprenant des moyens de rappel (160) tendant à déplacer le bloc-cylindres (120) pour désengager les moyens d'engagement (150), de sorte à désengager le bloc cylindres (120) en rotation, le distributeur (140) étant configuré pour, lors de l'application d'une pression, engager les moyens d'engagement (150), la machine hydraulique (100) étant caractérisé en ce qu'elle comprend en outre un ressort d'activation (200) exerçant une force de maintien en contact entre le distributeur (140) et le bloc-cylindres (120).
Abstract:
Le dispositif comprend un distributeur interne, devant être disposé dans une partie de carter (10A) et comprenant un corps (15) dont une face axiale externe (15B) présente deux gorges (17, 19), respectivement pour l'alimentation et l'échappement. Le distributeur comporte des conduits de distribution (23A, 23B, 23C) qui débouchent dans une face radiale de distribution et un sélecteur de cylindrée ayant un tiroir (50) apte à être déplacé dans un alésage axial (53) pour relier les conduits de distribution à l'une ou l'autre des gorges. Le dispositif comprend une chambre de commande (52), ménagée entre une première paroi de fond (15') de l'alésage et la première extrémité (50A) du tiroir, et un ressort antagoniste (55) disposé dans une chambre de rappel (52'), située à la deuxième extrémité (53'') de l'alésage et fermée, du côté de la face de distribution (15A), par une deuxième paroi de fond (55') du distributeur.