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Algorithm to diagnose leaks or blockages downstream of the secondary air injection reaction (sair) pressure sensor

A technology of sensors and intake pressure, applied in exhaust devices, exhaust treatment, machines/engines, etc., can solve difficult problems such as downstream fault detection of SAI valves

Inactive Publication Date: 2012-04-18
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While some control systems have adequately detected such faults upstream of the SAI valve, it is difficult to detect faults downstream of the SAI valve

Method used

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  • Algorithm to diagnose leaks or blockages downstream of the secondary air injection reaction (sair) pressure sensor
  • Algorithm to diagnose leaks or blockages downstream of the secondary air injection reaction (sair) pressure sensor
  • Algorithm to diagnose leaks or blockages downstream of the secondary air injection reaction (sair) pressure sensor

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Embodiment Construction

[0025] The following description of the preferred embodiments is exemplary in nature and in no way intended to limit the disclosure, application or application. The term "module" as used herein refers to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (shared processor, dedicated processor, or group processor) and memory, a mixed logic circuit, that executes one or more software or firmware programs And / or other suitable elements that can provide the functions.

[0026] refer to figure 1 , shows a typical engine control system 8 . Throttle valve 10 and fuel system 12 may control the delivery of fuel and primary air to engine 14 via inlet 16 . Ignition system 18 may ignite a fuel and primary air mixture within engine 14 . Exhaust gas generated by the combustion of the mixture of fuel and primary air can be exhausted through the exhaust pipe 20 . Catalytic converter 22 receives exhaust and reduces exhaust emissions.

[0027] Controller ...

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Abstract

The invention relates to a secondary gas injection rection pressure sensor downstream leakage or block indentification algorithm. A control module and method for an exhaust system of an engine can include a secondary air intake (SAI) pressure module that monitors SAI pressure. An accumulation module can accumulate an SAI string length based on the monitored SAI pressure. A calculation module can determine an average SAI string length based on the accumulated SAI string length. A determination module can determine an operating characteristic of the vehicle exhaust based on the average SAI string length.

Description

[0001] Cross References to Related Applications [0002] This application claims the related benefit of US Provisional Application No. 61 / 025,556, filed February 1, 2008. The above-mentioned application publication is hereby incorporated by reference. technical field [0003] The present disclosure relates to secondary gas injection reaction systems (SAIR), and in particular, to methods of leak or blockage detection for SAIR systems downstream of SAIR pressure sensors. Background technique [0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0005] It is known to use a catalytic converter in the exhaust gas duct of a motor vehicle with an internal combustion engine. Catalytic converters consist of a substrate coated with a catalyst material that catalyzes the nitriding of hydrocarbon molecules and carbon monoxide molecules and reduces emissions of nitrogen oxides in vehicle exhau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/22
CPCF01N9/00F01N3/22Y02A50/20
Inventor I·J·麦埃文M·L·霍尔L·O·默里J·C·格罗R·A·范坎普D·E·普罗特I·阿尼尔罗维奇
Owner GM GLOBAL TECH OPERATIONS LLC
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