Pump failure differentiation system

Patent metadata

Field	Value
Publication number	US-10844854-B2
Application number	US-201715412630-A
Country	US
Kind code	B2
Filing date	Jan 23, 2017
Priority date	Jan 23, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A pump monitoring and notification system for a hydraulic pump includes an accelerometer and a controller. The accelerometer is associated with the hydraulic pump and is disposed relative to the hydraulic pump to generate acceleration data indicative of acceleration of the hydraulic pump. The controller is configured to access a fault threshold, access a time threshold, and determine an acceleration of the accelerometer based upon the acceleration data from the accelerometer. The controller is further configured to determine an RMS average of the acceleration of the accelerometer based upon the acceleration of the hydraulic pump, compare the RMS average of the acceleration of the accelerometer to the fault threshold, and generate an alert signal when the RMS average of the acceleration of the accelerometer exceeds the fault threshold for a time period exceeding the time threshold.

First claim

The invention claimed is:

1. A pump monitoring and notification system for a hydraulic pump, comprising: an accelerometer associated with the hydraulic pump, the accelerometer disposed relative to the hydraulic pump to generate acceleration data indicative of acceleration of the hydraulic pump; and a controller configured to: access a fault threshold; access a time threshold; determine an acceleration of the accelerometer based upon the acceleration data from the accelerometer; determine an RMS average, which is a root-mean-square, of the acceleration of the accelerometer based upon the acceleration of the hydraulic pump; compare the RMS average of the acceleration of the accelerometer to the fault threshold; access a differentiation threshold, determine an RMS peak-to-peak value of the acceleration of the accelerometer based upon the acceleration of the hydraulic pump, compare the RMS peak-to-peak value of the acceleration of the accelerometer to the differentiation threshold; generate an alert signal when the RMS average of the acceleration of the accelerometer exceeds the fault threshold for a time period exceeding the time threshold and when the RMS peak-to-peak value of the acceleration of the accelerometer exceeds the differentiation threshold.

2. The pump monitoring and notification system of claim 1 , wherein the controller is further configured to determine the RMS average of the acceleration of the accelerometer for a plurality of predetermined time periods.

3. The pump monitoring and notification system of claim 2 , wherein each of the plurality of predetermined time periods corresponds to a time for each rotation of the hydraulic pump.

4. The pump monitoring and notification system of claim 1 , wherein the controller is further configured to generate a cavitation alert signal when the RMS peak-to-peak value of the acceleration of the accelerometer is equal to or less than the differentiation threshold.

5. The pump monitoring and notification system of claim 1 , wherein the controller if further configured to determine the RMS peak-to-peak value of the acceleration for the time period.

6. The pump monitoring and notification system of claim 1 , wherein a sampling rate of the acceleration data is at least at 5 kHz.

7. The pump monitoring and notification system of claim 6 , wherein the controller is further configured to determine an RMS acceleration for each of a plurality of first time periods and determine the RMS average for each of a plurality of second time periods, each second time period being longer than each first time period.

8. The pump monitoring and notification system of claim 7 , wherein the controller is further configured to determine the RMS peak-to-peak value for each second time period.

9. The pump monitoring and notification system of claim 1 , wherein the controller includes a first processor and a second processor, and the second processor is configured to process the acceleration data at a sampling rate of at least at 5 kHz to determine RMS acceleration for a plurality of first time periods, each first time period having an identical length, and the first processor is configured to process the RMS acceleration for each first time period at a slower rate than the second processor to determine the RMS average for a plurality of second time periods, each second time period having an identical length and each second time period being longer than each first time period.

10. The pump monitoring and notification system of claim 1 , wherein the controller is further configured to only generate an alert signal if the hydraulic pump is operating at a steady state.

11. The pump monitoring and notification system of claim 1 , wherein the accelerometer is disposed on a manifold operatively connected to the hydraulic pump.

12. A pumping system comprising:
a prime mover;
a transmission operatively connected to and driven by the prime mover;
a hydraulic pump operatively connected to and driven by the transmission;
an accelerometer associated with the hydraulic pump, the accelerometer disposed relative to the hydraulic pump to generate acceleration data indicative of acceleration of the hydraulic pump; and
a controller configured to:
access a fault threshold;
access a differentiation threshold;
access a time threshold;
determine an acceleration of the accelerometer based upon the acceleration data from the accelerometer;
determine an RMS average, which is a root-mean-square, of the acceleration based upon the acceleration of the hydraulic pump;
compare the RMS average of the acceleration of the accelerometer to the fault threshold; and
when the RMS average of the acceleration of the accelerometer exceeds the fault threshold for a time period exceeding the time threshold,
determine an RMS peak-to-peak value of the acceleration of the accelerometer based upon the acceleration of the hydraulic pump;
compare the RMS peak-to-peak value of the acceleration of the accelerometer to the differentiation threshold; and

generate a leak alert signal when the RMS peak-to-peak value of the acceleration of the accelerometer exceeds the differentiation threshold and generate a cavitation alert signal when the RMS peak-to-peak value is less than the differentiation threshold.

Assignees

• Caterpillar Inc

Inventors

• Zhang Yanchai
• Cai Zhijun
• Dong Zhaoxu
• Hu Xuefei

Classifications

• F04B2201/0203

  Acceleration of the piston · CPC title

• F04B49/06

  Control using electricity (regulating by means of floats actuating electric switches F04B49/04) · CPC title

• F04B49/103

  Responsive to speed · CPC title

• F04B15/04

  the fluids being hot or corrosive (for liquids near their boiling point, e.g. under subnormal pressure, F04B15/06) · CPC title

• F04B17/05

  driven by internal-combustion engines · CPC title