Use Of Intrusive Turbo Wastegate Control For Improved AFIM Detection Capability

Patent metadata

Field	Value
Publication number	US-2017191429-A1
Application number	US-201614989363-A
Country	US
Kind code	A1
Filing date	Jan 6, 2016
Priority date	Jan 6, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

A system includes an air/fuel imbalance (AFIM) control module that determines a position of a wastegate, selectively opens the wastegate in response to a determination that the wastegate is not in a desired open position, and selectively generates an enable signal in response to a determination that the wastegate is in the desired open position. An AFIM calculation module receives an oxygen signal from an oxygen sensor positioned in fluid communication with exhaust flow from the wastegate and selectively calculates an AFIM in a cylinder bank of an engine based on the oxygen signal and the enable signal generated by the AFIM control module.

First claim

What is claimed is:

1 . A system, comprising:
an air/fuel imbalance (AFIM) control module that determines a position of a wastegate, that selectively opens the wastegate in response to a determination that the wastegate is not in a desired open position, and that selectively generates an enable signal in response to a determination that the wastegate is in the desired open position; and an AFIM calculation module that receives an oxygen signal from an oxygen sensor positioned in fluid communication with exhaust flow from the wastegate and that selectively calculates an AFIM in a cylinder bank of an engine based on the oxygen signal and the enable signal generated by the AFIM control module.

2 . The system of claim 1 , wherein the desired open position corresponds to one of a fully open position and a minimum percent open position.

3 . The system of claim 1 , wherein, in response to a determination that the wastegate is not in the desired open position, the AFIM control module determines a period elapsed since the AFIM calculation module previously calculated the AFIM.

4 . The system of claim 3 , wherein the AFIM control module selectively opens the wastegate and generates the enable signal based on the determined elapsed period.

5 . The system of claim 4 , wherein, in response to generating the enable signal, the AFIM control module resets a timer that indicates the period elapsed since the AFIM calculation module previously calculated the AFIM.

6 . The system of claim 4 , wherein the AFIM control module (i) compares the determined elapsed period to a predetermined period and (ii) opens the wastegate to the desired open position and generates the enable signal when the determined elapsed period is greater than or equal to the predetermined period.

7 . The system of claim 1 , wherein the AFIM control module generates the enable signal in response to a determination that the wastegate is in the desired open position and further based on a determination that one or more vehicle operating conditions are met.

8 . The system of claim 1 , wherein the AFIM calculation module generates an AFIM indication signal based on the calculation of the AFIM.

9 . The system of claim 8 , wherein the AFIM indication signal indicates at least one of an indication of the AFIM, an indication of the cylinder bank having the AFIM, and an indication of a cylinder having the AFIM.

10 . A method, comprising:
determining a position of a wastegate; selectively opening the wastegate in response to a determination that the wastegate is not in a desired open position; selectively generating an enable signal in response to a determination that the wastegate is in the desired open position; receiving an oxygen signal from an oxygen sensor positioned in fluid communication with exhaust flow from the wastegate; and selectively calculating an AFIM in a cylinder bank of an engine based on the oxygen signal and the enable signal.

11 . The method of claim 10 , wherein the desired open position corresponds to one of a fully open position and a minimum percent open position.

12 . The method of claim 10 , further comprising, in response to a determination that the wastegate is not in the desired open position, determining a period elapsed since the AFIM was previously calculated.

13 . The method of claim 12 , further comprising selectively opening the wastegate and generating the enable signal based on the determined elapsed period.

14 . The method of claim 13 , further comprising, in response to generating the enable signal, resetting a timer that indicates the period elapsed since the AFIM was previously calculated.

15 . The method of claim 13 , further comprising (i) comparing the determined elapsed period to a predetermined period and (ii) opening the wastegate to the desired open position and generating the enable signal when the determined elapsed period is greater than or equal to the predetermined period.

16 . The method of claim 10 , further comprising generating the enable signal in response to a determination that the wastegate is in the desired open position and further based on a determination that one or more vehicle operating conditions are met.

17 . The method of claim 10 , further comprising generating an AFIM indication signal based on the calculation of the AFIM.

18 . The method of claim 17 , wherein the AFIM indication signal indicates at least one of an indication of the AFIM, an indication of the cylinder bank having the AFIM, and an indication of a cylinder having the AFIM.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Tylutki Vincent J
• Marotta Kenneth L
• Garcia Linda
• Slade Sean
• Macewen Ian J

Classifications

• F02D41/0082

  per groups or banks (F02D41/0087 takes precedence) · CPC title

• F02D41/22

  Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} · CPC title

• F02B37/12

  Control of the pumps · CPC title

• F02D13/06

  Cutting-out cylinders · CPC title

• F02D41/1454

  the characteristics being an oxygen content or concentration or the air-fuel ratio · CPC title