Service test for exhaust gas treatment system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8607625
APP PUB NO 20130298655A1
SERIAL NO

13468327

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A service procedure to test the SCR device involves turning on an upstream and downstream SCR NOx sensor, turning off an NH3 injector, running the engine until enough upstream NOx mass has been generated by the engine to deplete any NH3 load remaining in the SCR device, determining the operational status of the NOx sensors as follows:

    if 1−downstream NOx ppm/upstream NOx ppm=approx. 0;then the downstream NOx sensor is reading the same as the upstream NOx sensor and the downstream NOx sensor is determined to be good and the SCR device may have to be replaced; andif 1−downstream NOx ppm/upstream NOx ppm>approx. 0;then the downstream NOx sensor is reading high and the downstream NOx sensor is determined to be bad and downstream NOx sensor may have to be replaced.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

Patent OwnerAddress
GM GLOBAL TECHNOLOGY OPERATIONS LLCP O BOX 300 MAIL CODE 482-C23-B21 DETROIT MI 48265-3000

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Coppola, John Highland, US 10 94
Kowalkowski, Janean E Northville, US 34 329

Cited Art Landscape

Load Citation

Patent Citation Ranking

Forward Cite Landscape

Load Citation

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
11.5 Year Payment $7400.00 $3700.00 $1850.00 Jun 17, 2025
Fee Large entity fee small entity fee micro entity fee
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00