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AssigneeReliance Electric Company
InventorsJoseph T. Woyton, Richard L. Meredith
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A system for controlling the acceleration and/or deceleration of a mechanical power drive having a rotatable power output element and a rotatable reaction element with a hydraulic or pneumatic brake mechanism connected thereto, in which a motor drive pump or other pressure creating device is connected by a fluid pressure line to the brake mechanism, and a bleed line with an electrically controlled valve therein is connected to the fluid pressure line for relieving the pressure delivered by the pump to the brake mechanism. An electrical system responsive to the rotational speed of the output element of the power drive controls the pressure creating means to control the acceleration and/or deceleration rate of the output element. An accumulator and a pressure responsive relief valve are preferably included in the system to assist in regulating the pressure delivered to the brake mechanism, and a dump valve and overload control device are normally included in the system.
An acceleration and deceleration control system for mechanical power drives having a rotatable power output element and rotatable reaction element with a fluid operated brake means connected thereto, said system comprising a fluid system having a fluid pressure creating means, a line connecting said fluid pressure creating means with said brake means, a bleed line connected to the line between said pressure creating means and said brake means, an electrically controlled valve means in said bleed line, electrical means for sensing the rotational speed of said output element and converting the signal therefrom into an electrical signal for comparison against first and second reference signals, leads connecting said electrical means to said pressure creating means and said bleed line valve, whereby said pressure creating means is energized when the output of the electrical signal exceeds a first predetermined threshold value and said bleed line valve is energized when said electrical signal exceeds a second predetermined threshold value, to control the rotation of said reaction element to obtain a predetermined acceleration and deceleration rate of said output element.
An acceleration and/or deceleration control system for mechanical power drives having a rotatable power output element and rotatable reaction element with a hydraulic brake means connected thereto, said system comprising a hydraulic system having a source of hydraulic fluid, a pump means, a line connecting said source to said pump means, a motor for driving said pump means, a line connecting said pump means with said brake means, a bleed line connected to the line between said pump means and said hydraulic brake means, an electrically controlled valve means in said bleed line, electrical means for sensing the rotational speed of said output element and converting the signal therefrom into an electrical signal for comparison against first and second reference signals, leads connecting said electrical means to said pump means and said bleed line valve, whereby said pump means is energized when the output of the electrical signal exceeds a first predetermined threshold value and said bleed line valve is energized when said electrical signal exceeds a second predetermined threshold value, to control the rotation of said reaction element to obtain a predetermined acceleration and/or deceleration rate of said output element.
An acceleration and/or deceleration control system for mechanical power drives having a rotatable power output element and rotatable reaction element with a fluid operated brake means connected thereto, said system comprising a fluid system having a fluid pressure creating means, a line connecting said fluid pressure creating means with said brake means, a bleed line connected to the line between said pressure creating means and said brake means, an electrically controlled valve means in said bleed line, electrical means for sensing the rotational speed of said output element and controlling said pressure creating means and said bleed line valve to obtain a predetermined acceleration and/or deceleration rate of said output element.
An acceleration and/or deceleration control system for mechanical power drives having a rotatable power output element and rotatable reaction element with a hydraulic brake means connected thereto, said system comprising a hydraulic system having a source of hydraulic fluid, a pump means, a line connecting said source to said pump means, a motor for driving said pump means, a line connecting said pump means with said brake means, a bleed line connected to the line between said pump means and said hydraulic brake means, an electrically controlled valve means in said bleed line, and electrical means for sensing the rotational speed of said output element and controlling said pressure creating means and said bleed line valve to obtain a predetermined acceleration and/or deceleration rate of said output element.
An acceleration and/or deceleration control system for mechanical power drives having a rotatable power output element, comprising means for restraining the rotational speed of said output element, means for releasing said restraining means, electrical means for sensing the rotational speed of said output element and converting the signal therefrom into an electrical signal for comparison against a reference signal, and leads connecting said electrical means to said restraining means and said releasing means, whereby said restraining means is actuated when the output of the electrical signal exceeds a first predetermined threshold value and said releasing means is actuated when said electrical signal exceeds a second predetermined threshold value to obtain a predetermined acceleration and/or deceleration rate of said output element.
Dependencies are inferred from the claim text.