Filter pre-fill detection system and method

Patent metadata

Field	Value
Publication number	US-10190508-B2
Application number	US-201615355003-A
Country	US
Kind code	B2
Filing date	Nov 17, 2016
Priority date	Nov 17, 2016
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A system for detecting a pre-fill status of a fuel filter in a fuel system includes a monitoring mechanism structured to monitor a fluid property of the fuel system indicative of priming. A control mechanism is coupled with and structured to received data from the monitoring mechanism, and outputs a signal responsive to a time to prime the fuel system that is indicative of a filter pre-fill state.

First claim

What is claimed is:

1. A fuel system comprising:
a fuel supply;
a fuel conduit for delivering fuel from the fuel supply to an engine;
a pump coupled between the fuel supply and the fuel conduit and operable to pump fuel between the fuel supply and the fuel conduit to prime the fuel system;
a fuel filter positioned fluidly between the pump and the fuel conduit; and
a filter pre-filling detection system including at least one monitoring mechanism structured to monitor a property of the fuel system indicative of a start of priming the fuel system and a property of the fuel system indicative of an end of priming the fuel system;
the filter pre-filling detection system further including a control mechanism coupled with the at least one monitoring mechanism, the control mechanism being structured to determine a time from the start of priming the fuel system to the end of priming the fuel system that is indicative of pre-filling of the fuel filter with fuel, and to produce an error signal responsive to the determined time where the determined time is indicative of pre-filling of the fuel filter with fuel.

2. The fuel system of claim 1 wherein the fuel conduit includes a fuel line fluidly coupled to a plurality of fuel injectors.

3. The fuel system of claim 2 wherein the pump includes a first pump positioned fluidly between the fuel supply and the fuel line, and further comprising a second pump positioned fluidly between the first pump and the fuel line, and wherein the fuel filter is positioned fluidly between the first pump and the second pump.

4. The fuel system of claim 1 wherein the control mechanism is further structured to compare the determined time with an expected time from the start of priming the fuel system to the end of priming the fuel system, and to produce the error signal where the determined time is less than the expected time.

5. The fuel system of claim 4 further comprising a reader coupled with the control mechanism and structured to read an identifier resident on the fuel filter, and wherein the control mechanism is further structured to determine the expected time responsive to reading the identifier.

6. The fuel system of claim 5 wherein the reader includes an RFID reader structured to read an RFID tag of the fuel filter.

7. The fuel system of claim 1 wherein the property indicative of the end of priming includes a fluid property of fuel within the fuel system, and the at least one monitoring mechanism includes a sensor structured to monitor the fluid property of fuel within the fuel system.

8. The fuel system of claim 7 wherein the sensor includes a pressure sensor and the fluid property includes a pressure of fuel within the fuel conduit.

9. The fuel system of claim 7 wherein the sensor includes a flow meter and the fluid property includes a flow of fuel within the fuel conduit.

10. A fuel filter pre-filling detection system for a pressurized fuel system comprising:
at least one monitoring mechanism structured to couple with the pressurized fuel system to monitor a property having a range of possible values indicative of a range of priming states of the pressurized fuel system;
a control mechanism coupled with the at least one monitoring mechanism and structured to determine a time to transition the pressurized fuel system from a first one of the priming states to a second one of the priming states;
the control mechanism being further structured to compare the determined time with an expected time to transition the fuel system from the first one of the priming states to the second one of the priming states, to determine a pre-fill state of a fuel filter in the pressurized fuel system based on a difference between the determined time and the expected time, and to generate a signal based at least in part upon the difference between the determined time and the expected time; and
wherein in the pre-fill state, the fuel filter is pre-filled with fuel prior to installation in the pressurized fuel system.

11. The detection system of claim 10 wherein the at least one monitoring mechanism includes a sensor structured to monitor a fluid property of fuel in the pressurized fuel system.

12. The detection system of claim 11 wherein the sensor includes a pressure sensor structured to monitor a pressure of fuel in the pressurized fuel system.

13. The detection system of claim 11 wherein the sensor includes a flow meter structured to monitor a flow of fuel in the pressurized fuel system.

14. The detection system of claim 10 wherein the control mechanism generates the signal if the determined time is less than the expected time.

15. The detection system of claim 10 wherein the signal encodes an error code.

16. The detection system of claim 10 wherein the control mechanism is further structured to command a fuel system state or a change in a fuel system state responsive to the signal.

17. The detection system of claim 16 wherein the fuel system state or change in fuel system state includes an electrical energy state or a change in an electrical energy state of an electrical actuator affecting a fuel flow pattern within the pressurized fuel system.

18. A method of detecting a fuel filter fill state in a fuel system comprising:
detecting a start of priming of a fuel system in an internal combustion engine;
determining an expected time to prime the fuel system;
detecting an end of priming of the fuel system;
determining an actual time to prime from the start of priming to the end of priming;
comparing the actual time to prime with the expected time to prime to detect a pre-filled state of a filter in the fuel system; and
generating a signal responsive to the detected pre-filled state of the filter.

19. The method of claim 18 wherein the fuel system includes a pump positioned fluidly between a fuel supply and a fuel line coupled with a plurality of fuel injectors.

20. The method of claim 18 wherein the signal encodes an error code.

Assignees

• Caterpillar Inc

Inventors

• Lehman Martin A

Classifications

• F02D33/003

  Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus (control of electrical fuel pumps F02D41/3082, controlling fuel flow to a common rail F02D41/3845); Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge · CPC title

• B01D35/143

  Filter condition indicators · CPC title

• F02D41/2435

  characterised by the writing medium, e.g. bar code · CPC title

• B01D2201/56

  Wireless systems for monitoring the filter · CPC title

• F02M37/18

  characterised by provision of main and auxiliary pumps · CPC title