Method and device for monitoring system units based on transmission of lumped characteristic numbers

• US 5,988,986 A
• Filed: 09/29/1997
• Issued: 11/23/1999
• Est. Priority Date: 09/28/1996
• Status: Expired due to Fees

• Current Assignee: MAAG Pump Systems Textron A.G. (Dover Corporation)
• Original Assignee: MAAG Pump Systems Textron A.G. (Dover Corporation)
• Inventors: Brinken, Frank, Heinen, Michael, Blume, Peter
• Primary Examiner(s): Freay, Charles G.
• Assistant Examiner(s): Gartenberg, Ehud
• Application Number:
  US08/939,648
• Time in Patent Office: 785 Days
• Field of Search: 417/53, 417/63
• US Class Current: 417/53
• CPC Class Codes: G05B 19/0428 Safety, monitoring G05B19/0423 takes precedence
• CPC Class Codes: G05B 2219/24048 Remote test, monitoring, diagnostic
• CPC Class Codes: G05B 2219/24084 Remote and local monitoring, local result to remote, remote takes action

Abstract

A method is provided for monitoring the operating status of one or more pumps, particularly gear pumps, whereby system parameters are determined by a corresponding measuring device. The system parameters are subsequently processed in a local evaluation unit into characteristic numbers. Finally at least some of the characteristic numbers determined in the local evaluation unit are transmitted from the pump and/or the local evaluation unit to the central evaluation unit. Based on the characteristic numbers, the operating status of the pump is determined and if necessary, an appropriate action is triggered.

Claims

1. A method for monitoring an operating status of a pump, the method comprising the steps of:

acquiring system parameters of the pump with a measuring device;

processing the system parameters in a local evaluation unit by calculating to lump at least three of said system parameters into one or more characteristics numbers;

transmitting from the local evaluation unit to a remote central evaluation unit said characteristic numbers calculated by said processing step in said local evaluation unit;

wherein the central evaluation unit, based on said characteristic numbers transmitted by said local evaluation unit, determines at least one of a current or future operating status of the pump.

2. Method according to claim 1, wherein the system parameters are acquired continuously while the characteristic numbers are transmitted periodically to the central evaluation unit.

3. Method according to claim 1, wherein four characteristic numbers are determined, comprising:

a delivery number which is a relationship between a deviation from an ideal throughput of the pump and an ideal throughput;

an energy number which is a relationship between an actual heat energy and an energy converted as a result of fluid friction;

a load number which is a relationship between a bearing load and a bearing capacity; and

a leak path number which is a relationship between differential pressures at an intake side, an output side, and upstream of a pump seal.

4. Method according to claim 2, wherein four characteristic numbers are determined, comprising:

a delivery number which is a relationship between a deviation from an ideal throughput of the pump and an ideal throughput;

an energy number which is a relationship between an actual heat energy and an energy converted as a result of fluid friction;

a load number which is a relationship between a bearing load and a bearing capacity; and

a leak path number which is a relationship between differential pressures at an intake side, an output side, and upstream of a pump seal.

5. Method according to claim 1, wherein the characteristic numbers are determined in the local evaluation unit and only the characteristic numbers are transmitted to the central evaluation unit.

6. Method according to claim 2, wherein the characteristic numbers are determined in the local evaluation unit and only the characteristic numbers are transmitted to the central evaluation unit.

7. Method according to claim 3, wherein the characteristic numbers are determined in the local evaluation unit and only the characteristic numbers are transmitted to the central evaluation unit.

8. Method according to claim 4, wherein the characteristic numbers are determined in the local evaluation unit and only the characteristic numbers are transmitted to the central evaluation unit.

9. Method according to claim 1, wherein the central evaluation unit receives data over a first data channel from the local evaluation unit and acts on the pump and/or on the local evaluation unit via a second data channel.

10. Method according to claim 3, wherein the central evaluation unit receives data over a first data channel from the local evaluation unit and acts on the pump and/or on the local evaluation unit via a second data channel.

13. Method according to claim 1, wherein said method steps monitor the operating status of each of several locally distributed pumps and trigger appropriate actions in accordance with the monitored operating status.

11. A device for monitoring an operating status, comprising:

a pump to be monitored;

a measuring device coupled to the pump to determine system parameters of the pump;

at least one central evaluation unit remotely located from the pump;

a local evaluation unit provided in a vicinity of the pump and coupled to the measuring device to receive the system parameters; and

at least one data channel connecting said local evaluation unit with said at least one central evaluation unit;

wherein said local evaluation unit comprises means for processing at least three of said system parameters into one or more characteristic numbers, said characteristic numbers being transmitted to said central evaluation unit; and

wherein said central evaluation unit comprises means for determining at least one of a current or future operating status of the pump based on the characteristic numbers.

12. The device according to claim 11, wherein one data channel originating at the central evaluation unit is actively connected with the local evaluation unit and/or the pump.