System And Method For Controlling The Amount Of Purge Fluid Delivered To Cylinders Of An Engine Based On An Operating Parameter Of A Purge Pump

Patent metadata

Field	Value
Publication number	US-2016123254-A1
Application number	US-201514614778-A
Country	US
Kind code	A1
Filing date	Feb 5, 2015
Priority date	Oct 31, 2014
Publication date	May 5, 2016
Grant date	—

Abstract

A system according to the present disclosure includes a pump operating parameter module and a purge flow control module. The pump operating parameter module determines a value of an operating parameter of a purge pump that delivers purge fluid from a canister in an evaporative emissions system to an intake system of an engine. The operating parameter of the purge pump includes at least one of a speed of the purge pump, an amount of current supplied to the purge pump, and an amount of power supplied to the purge pump. The purge flow control module controls at least one of a purge valve and the purge pump to adjust an amount of purge fluid delivered to a cylinder of an engine based on the determined value of the operating parameter of the purge pump.

First claim

1 . A system comprising:
a pump operating parameter module that determines an operating parameter of a purge pump that delivers purge fluid from a canister in an evaporative emissions system to an intake system of an engine, wherein the operating parameter of the purge pump includes at least one of a speed of the purge pump, an amount of current supplied to the purge pump, and an amount of power supplied to the purge pump; a fuel vapor content module that determines a fuel vapor content of the purge fluid based on at least one of the operating parameter of the purge pump and a pressure downstream of the purge pump, wherein the fuel vapor content is a ratio of an amount of fuel vapor in the purge fluid to an amount of the purge fluid; and a purge flow control module that controls at least one of a purge valve and the purge pump to adjust an amount of purge fluid delivered to a cylinder of an engine based on the fuel vapor content.

2 - 3 . (canceled)

4 . The system of claim 27 wherein the purge flow control module determines the first value based on the speed of the purge pump and a flow rate of purge fluid flowing through the purge valve.

5 . The system of claim 1 wherein the operating parameter of the purge pump includes the amount of power supplied to the purge pump.

6 . The system of claim 5 further comprising a purge flow rate module that determines a first flow rate of purge fluid flowing through the purge pump based on the purge pump power and determines a second flow rate of purge fluid flowing through the purge valve based on a purge fluid pressure.

7 . The system of claim 6 further comprising a purge flow power module that determines a power associated with the purge fluid flowing through the purge valve based on the second flow rate and a pressure difference across the purge valve.

8 . The system of claim 7 wherein the fuel vapor content module determines the fuel vapor content based on the purge pump power and the purge flow power.

9 . The system of claim 8 further comprising a purge fuel contribution module that determines a contribution of the fuel in the purge fluid flowing through the purge valve to a total amount of fuel delivered to the cylinder based on the fuel vapor content.

10 . The system of claim 9 wherein the purge flow control module decreases the amount of purge fluid flowing through the purge valve when the purge fuel contribution is greater than a predetermined value.

11 . A method comprising:
determining a value of an operating parameter of a purge pump that delivers purge fluid from a canister in an evaporative emissions system to an intake system of an engine, wherein the operating parameter of the purge pump includes at least one of a speed of the purge pump, an amount of current supplied to the purge pump, and an amount of power supplied to the purge pump; determining a fuel vapor content of the purge fluid based on at least one of the operating parameter of the pump and a pressure downstream of the purge pump, wherein the fuel vapor content is a ratio of an amount of fuel vapor in the purge fluid to an amount of the purge fluid; and controlling at least one of a purge valve and the purge pump to adjust an amount of purge fluid delivered to a cylinder of an engine based on the fuel vapor content.

12 - 13 . (canceled)

14 . The method of claim 28 further comprising determining the first value based on the speed of the purge pump and a flow rate of purge fluid flowing through the purge valve.

15 . The method of claim 11 wherein the operating parameter of the purge pump includes the amount of power supplied to the purge pump.

16 . The method of claim 15 further comprising:
determining a first flow rate of purge fluid flowing through the purge pump based on the purge pump power; and
determining a second flow rate of purge fluid flowing through the purge valve based on a purge fluid pressure.

17 . The method of claim 16 further comprising a purge flow power module that determines a power associated with the purge fluid flowing through the purge valve based on the second flow rate and a pressure difference across the purge valve.

18 . The method of claim 17 further comprising determining the fuel vapor content based on the purge pump power and the purge flow power.

19 . The method of claim 18 further comprising determining a contribution of the fuel in the purge fluid flowing through the purge valve to a total amount of fuel delivered to the cylinder based on the fuel vapor content.

20 . The method of claim 19 further comprising decreasing the amount of purge fluid flowing through the purge valve when the purge fuel contribution is greater than a predetermined value.

21 . The system of claim 1 wherein the fuel vapor content module determines the fuel vapor content based on the speed of the purge pump and at least one of the amount of power supplied to the purge pump and the pressure downstream of the purge pump.

22 . The system of claim 21 wherein the fuel vapor content module determines the fuel vapor content further based on a flow rate of the purge fluid.

23 . The system of claim 6 wherein the fuel vapor content module determines the fuel vapor content based on the first flow rate and the second flow rate.

24 . The method of claim 11 further comprising determining the fuel vapor content based on the speed of the purge pump and at least one of the amount of power supplied to the purge pump and the pressure downstream of the purge pump.

25 . The method of claim 24 further comprising determining the fuel vapor content further based on a flow rate of the purge fluid.

26 . The method of claim 16 further comprising determining the fuel vapor content based on the first flow rate and the second flow rate.

27 . A system comprising:
a pump operating parameter module that determines a value of an operating parameter of a purge pump that delivers purge fluid from a canister in an evaporative emissions system to an intake system of an engine, wherein the operating parameter of the purge pump includes at least one of a speed of the purge pump, an amount of current supplied to the purge pump, and an amount of power supplied to the purge pump; and a purge flow control module that:
determines a difference between the determined value of the operating parameter of the purge pump and a commanded value of the operating parameter; and
controls at least one of a purge valve and the purge pump to adjust an amount of purge fluid delivered to a cylinder of an engine when the difference is greater than a first value, indicating a change in an amount of fuel vapor in purge fluid flowing through the purge valve.

28 . A method comprising:
determining a value of an operating parameter of a purge pump that delivers purge fluid from a canister in an evaporative emissions system to an intake system of an engine, wherein the operating parameter of the purge pump includes at least one of a speed of the purge pump, an amount of current supplied to the purge pump, and an amount of power supplied to the purge pump; determining a difference between the determined value of the operating parameter of the purge pump and a commanded value of the operating parameter; and controlling at least one of a purge valve and the purge pump to adjust an amount of purge fluid delivered to a cylinder of an engine when the difference is greater than a first value,

Assignees

• Gm Global Tech Operations Inc

Inventors

• Burleigh Darrell W
• Musienko Christopher P
• Swartz Kenneth C

Classifications

• F02M25/0854

  Details of the absorption canister · CPC title

• F02M25/0836

  Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold · CPC title

• F02D41/003 Primary

  Adding fuel vapours, e.g. drawn from engine fuel reservoir · CPC title

• F02M25/089

  Layout of the fuel vapour installation · CPC title

• F02B77/04 Primary

  Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines · CPC title