Unlock instant, AI-driven research and patent intelligence for your innovation.

Leak and blockage diagnostic systems and methods

A technology of a diagnosis system and a diagnosis method, which is applied to the diagnosis device of the exhaust gas treatment device, the internal combustion piston engine, and the electrical control, etc., can solve the problems such as the inability of the catalyst to react and the limitation.

Active Publication Date: 2017-04-12
GM GLOBAL TECH OPERATIONS LLC
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature of the catalyst is lower than the predetermined light-off temperature, the catalyst may not respond
Therefore, when the catalyst temperature is likely to be less than the predetermined light-off temperature, the responsiveness of the catalyst may be limited briefly after the engine is started (eg, key-on)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Leak and blockage diagnostic systems and methods
  • Leak and blockage diagnostic systems and methods
  • Leak and blockage diagnostic systems and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0074] Combustion of the air / fuel mixture within the engine produces exhaust gas that includes hydrocarbons, carbon oxides, nitrogen oxides, water, and other byproducts. The catalyst reacts with components of the exhaust gas before it is driven out of the vehicle. For example, the catalyst oxidizes hydrocarbons in the exhaust.

[0075] The ability of the catalyst to oxidize hydrocarbons may be limited by the amount of oxygen in the exhaust. A secondary air injection (SAI) pump pumps ambient air into the exhaust upstream of this catalyst. The additional oxygen provided by the SAI pump increases the catalyst's ability to oxidize hydrocarbons.

[0076] The SAI pump pumps ambient air through the first and second SAI valves into the exhaust. First and second pressure sensors measure pressure at the first and second SAI valves. The pressure measured by the first and second pressure sensors may change as the engine expels exhaust gas from its cylinders.

[0077] A control module...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A diagnostic system for a vehicle is disclosed. A first difference module generates a first difference based on a first pressure measured at a first secondary air injection (SAI) valve and a previous value of the first pressure. A first summer module generates a first accumulated difference based on a sum of values of the first difference generated during a predetermined period. A second difference module generates a second difference based on a second pressure measured at a second SAI valve and a previous value of the second pressure. A second summer module generates a second accumulated difference based on a sum of values of the second difference generated during the predetermined period. A fault indication module selectively indicates that a fault is present downstream of one of the first and second SAI valves based on the first and second accumulated differences.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application Serial No. 61 / 716,055, filed October 19, 2012. The disclosures of the aforementioned applications are incorporated herein by reference in their entireties. technical field [0003] The present disclosure relates to internal combustion engines, and more particularly to diagnostic systems and methods for vehicles with two secondary air injection valves. Background technique [0004] The background description provided herein is for the purpose of generally presenting the context of the disclosure. The work described by the inventors in this Background section and aspects that are not described as prior art at the time of filing are neither expressly nor impliedly admitted to be prior art that conflicts with the present disclosure. [0005] The engine combusts an air / fuel mixture to produce drive torque for the vehicle. Air is drawn into the engine thro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F02B77/08
CPCF01N3/32F01N11/00F01N2550/14F01N2900/1804F02B77/088F02D41/021F02D41/0245F02D41/0255F02D41/22F02D2041/228Y02A50/20Y02T10/12Y02T10/40
Inventor I.J.麦克尤恩S.W.梅杰斯E.R.克拉克二世
Owner GM GLOBAL TECH OPERATIONS LLC