Process, sensor and diagnosis device for pump diagnosis

• US 7,693,684 B2
• Filed: 10/17/2006
• Issued: 04/06/2010
• Est. Priority Date: 10/17/2005
• Status: Expired due to Fees

• Current Assignee: I F M Electronic GmbH
• Original Assignee: I F M Electronic GmbH
• Inventors: Wagner, Alfred, Hoffmann, Matthias, Halbinger, Lorenz, Schuetze, Joerg, Spinnenhirn, Daniel
• Primary Examiner(s): Wachsman; Hal D
• Application Number:
  US11/550,038
• Publication Number:
  US 20070239371A1
• Time in Patent Office: 1,267 Days
• Field of Search: 702/182, 702/34, 702/114, 702/140, 702/183
• US Class Current: 702/182
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04B 51/00 Testing machines, pumps, or pumping installations

Abstract

A process for detecting the operating state of a pump of a pump system, involves the steps of: detecting at least one pressure and/or flow profile P(t) in the pump system, computing of at least one characteristic value K_kal from the pressure and/or flow profile P(t), comparing the computed characteristic value K_kal with at least one defined characteristic value K_vor or with a range bordered by the characteristic value K_vor, the defined characteristic value K_vor or the characteristic value range corresponding to the operating state of the pump of interest, and outputting the operating state determined by the comparison. With the process, the operating states of pumps, pump systems and hydraulic systems is determined by the computed characteristic value K_kal characterizing the pulsation of the pressure and/or flow profile P(t) in a computation time interval Δt_B, the pulsation quotient being computed as the computed characteristic value K_kal.

Claims

1. Process for detecting the operating state of a pump in a pump system, comprising the steps of:

detecting at least one of a pressure and a flow profile P(t) in the pump system,

computing at least one characteristic value K_kal of the at least one of the pressure and flow profile P(t),

determining the operating state of the pump by comparing the at least one computed characteristic value K_kal with at least one of a predefined characteristic value K_vor and a characteristic value range bordered by the characteristic value K_vor, and

outputting the operating state of the pump determined by the comparison,

wherein the at least one computed characteristic value K_kal characterizes a pulsation of at least one of the pressure and flow profile P(t) in a computation time interval Δ

t_B, a pulsation quotient being computed as the at least one computed characteristic value K_kal.

2. Process as claimed in claim 1, wherein the at least one of the pressure and flow profile P(t) is detected in the vicinity of the outflow region of the pump.

3. Process as claimed in claim 1, wherein the computation time interval Δ

t_B encompasses at least as many pulsation events correspond to one complete revolution of the pressure-generating elements of the pump.

4. Process as claimed in claim 1, wherein the pulsation quotient is a quotient of the difference of at least one of a maximum and minimum delivery medium pressure and a flow which has at least one of pressure and flow in the computation time interval Δ

t_B.

5. Process as claimed in claim 1, wherein the predefined characteristic value K_vor is determined at the start of the process within a teaching time interval, the pump being in an operating state of interest during the teaching time interval.

6. Process as claimed in claim 1, wherein the behavior of the at least one computed characteristic value K_kal is smoothed by computing a sliding weighted arithmetic mean beforehand.

7. Process as claimed in claim 1, wherein, depending on at least one influencing variable, different characteristic values K_vor are defined.

8. Process as claimed in claim 7, wherein the at least one influencing variable is a state variable of at least one of the pump and the pump system.

9. Process for detecting the operating state of a pump in a pump system, comprising the steps of:

detecting at least one of a pressure and a flow profile P(t) in the pump system,

computing at least one characteristic value K_kal of the at least one of the pressure and flow profile P(t),

determining the operating state of the pump by comparing the at least one computed characteristic value K_kal with at least one of a predefined characteristic value K_vor and a characteristic value range bordered by the characteristic value K_vor and

outputting the operating state of the pump determined by the comparison,

wherein the at least one computed characteristic value K_kal characterizes a time change of at least one of the pressure and the flow profile P(t), the characteristic value K_vor defining a maximum/minimum time change of the at least one of the pressure and the flow profile P(t).

10. Process as claimed in claim 9, wherein a tolerance band is placed around the characteristic value K_vor so that at least one of a lower predefined characteristic value K_vor,u and an upper predefined characteristic value K_vor,o results.

11. Process as claimed in claim 10, wherein the distance of at least one of the lower predefined characteristic value K_vor,u and the distance of the upper predefined characteristic value K_vor,o to the predefined characteristic value K_vor corresponds to 10 to 90% of the predefined characteristic value K_vor.

12. Process for detecting the operating state of a device with at least one hydraulic actuator, comprising the steps of:

detecting a pressure profile P(t) in one of the at least one hydraulic actuator and a feed line to the at least one hydraulic actuator,

comparing the detected pressure profile P(t) with a predefined pressure profile P_vor(t) and comparing at least one computed characteristic value K_kal which characterizes the detected pressure profile P(t) to at least one corresponding characteristic value K_vor which characterizes the predefined pressure profile P_vor(t),

outputting an operating state of the device determined by the comparison, and

wherein the characteristic values K_kal and K_vor computed from the detected and the predefined pressure profiles are based on a vibration analysis.