System and Method for Identifying Impending Hydraulic Pump Failure
First Claim
1. A method of determining impending pump failure in a multiple pump hydraulic system, comprising;
- measuring volumetric efficiency of the hydraulic system;
determining that one of the multiple pumps is approaching failure when the volumetric efficiency is decreasing at a rate greater than a predetermined threshold;
measuring pump displacement at standby for first and second pumps when it is determined that one of the pumps is approaching failure;
determining which one of the first and second pumps is approaching failure when the measured pump displacement at standby of one of the pumps is greater than the pump displacement at standby for the other pump by a predetermined range; and
generating a signal indicating an impending failure of the pump with the greater pump displacement at standby.
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Accused Products
Abstract
A system and method for predicting impending pump failure in a hydraulic system is disclosed. The system measures and compares the running and moving volumetric deficiencies of the hydraulic system as a whole and if they are not within range of each other by a predetermined threshold, the system determines that at least one of the pumps in the system is about to fail. If such a determination is made by the system, the pump displacement is at standby of each pump is then calculated and the pump with the greatest displacement at standby is determined to be the pump approaching failure. Once the pump approaching failure is identified, a signal is generated to apprise the operator or other entity to enable corrective action to be taken.
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Citations
20 Claims
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1. A method of determining impending pump failure in a multiple pump hydraulic system, comprising;
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measuring volumetric efficiency of the hydraulic system; determining that one of the multiple pumps is approaching failure when the volumetric efficiency is decreasing at a rate greater than a predetermined threshold; measuring pump displacement at standby for first and second pumps when it is determined that one of the pumps is approaching failure; determining which one of the first and second pumps is approaching failure when the measured pump displacement at standby of one of the pumps is greater than the pump displacement at standby for the other pump by a predetermined range; and generating a signal indicating an impending failure of the pump with the greater pump displacement at standby. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hydraulic system, comprising:
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at least two pumps; at least two hydraulic cylinders; at least one valve between the at least two pumps and at least two hydraulic cylinders; at least one hydraulically actuated tool operatively connected to each hydraulic cylinder; a displacement sensor associated with each hydraulic cylinder; a speed sensor associated with each pump; a pressure sensor associated with the at least one valve; and a processor receiving signals from each sensor, calculating volumetric efficiency over time, determining a pump failure is impending when the volumetric efficiency is decreasing at a rate greater than a predetermined threshold, calculating pump displacement at standby for the at least two pumps, determining if one of the pump displacements at standby is greater than the other by a predetermined range, and generating a signal indicating an impending pump failure for the pump with the greater pump displacement at standby. - View Dependent Claims (13, 14, 15, 16)
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17. A machine, comprising:
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a chassis; a drivetrain movably supporting the chassis; an engine supported by the chassis and operatively connected to the drive train; an operator cabin supported by the chassis; at least two hydraulic pumps supported by the chassis; at least two hydraulic cylinders extending from the chassis and operatively connected to the hydraulic pumps; at least one valve between the at least two pumps and the at least two hydraulic cylinders; at least one hydraulically actuated tool operatively connected to each hydraulic cylinder; a speed sensor associated with each pump; a pressure sensor associated with the at least one valve; a processor receiving signals from each sensor calculating volumetric efficiency over time, determining pump failure is impending when the volumetric efficiency is decreasing at a rate greater than a predetermined threshold, calculating pump displacement at standby for the at least two pumps, determining if one of the pump displacements at standby is greater than the other by a predetermined range, and generating a signal indicating an impending pump failure for the pump with the greater pump displacement at standby; and an operator interface in the operator cabin adapted to receive the impending failure signal and display indicia indicative of same. - View Dependent Claims (18, 19, 20)
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Specification