APPARATUS AND METHOD FOR MONITORING A HYDRAULIC PUMP ON A MATERIAL HANDLING VEHICLE
First Claim
1. A method for estimating wear of a pump connected to a hydraulic actuator that moves a member on a material handling vehicle, said method comprising:
- operating the pump to drive the hydraulic actuator to move the member on the material handling vehicle;
determining an actual speed of the member;
sensing an operating parameter of the pump and a characteristic of fluid flow produced by the pumpin response to the sensing, calculating a predicted speed of the member;
comparing the predicted speed to the actual speed; and
in response to the comparing, providing an indication of a degree of wear of the pump.
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Accused Products
Abstract
Wear of a pump is estimated using a process that involves operating the pump to drive a hydraulic actuator that moves a member. The actual speed of the member is determined and the speed of the pump is sensed. Pressure of fluid conveyed from the pump to the hydraulic actuator also is sensed. A predicted speed of the member is calculated based on the speed of the pump and the pressure of the fluid. The predicted speed is compared to the actual speed and the result is employed to provide an indication of a degree of wear of the pump. The difference between the predicted speed and the actual speed increases as the pump wear increases.
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Citations
23 Claims
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1. A method for estimating wear of a pump connected to a hydraulic actuator that moves a member on a material handling vehicle, said method comprising:
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operating the pump to drive the hydraulic actuator to move the member on the material handling vehicle; determining an actual speed of the member; sensing an operating parameter of the pump and a characteristic of fluid flow produced by the pump in response to the sensing, calculating a predicted speed of the member; comparing the predicted speed to the actual speed; and in response to the comparing, providing an indication of a degree of wear of the pump. - View Dependent Claims (2, 3, 4, 5)
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6. A method for estimating wear of a pump connected to a hydraulic actuator that moves a member on a material handling vehicle, said method comprising:
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operating the pump to drive the hydraulic actuator to move the member on the material handling vehicle; determining an actual speed of the member; sensing speed of the pump; sensing pressure of fluid conveyed from the pump to the hydraulic actuator; calculating a predicted speed based on the speed of the pump and the pressure of the fluid; comparing the predicted speed to the actual speed; and in response to the comparing, providing an indication of a degree of wear of the pump. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for estimating wear of a pump connected to a hydraulic actuator that moves a member on a material handling vehicle, said apparatus comprising:
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at least one sensing device that produces a signal from which an actual speed of the member is determined; a first sensor for sensing speed of the pump; a second sensor for sensing pressure of fluid conveyed from the pump to the hydraulic actuator; and a controller connected to the at least one sensing device, and the first and second sensors for calculating a predicted speed based on the speed of the pump and the pressure of the fluid, comparing the predicted speed to the actual speed, and, in response to the comparing, providing an indication of a degree of wear of the pump. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification