# US 2014/0150528 A1 · Simplified method for measuring concentration of various exhaust gas mixture components utilizing dissimilar sensors

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- Number: US 2014/0150528 A1
- Document ID: US20140150528A1
- Status: Published application
- Kind: A1
- Application number: 13/815,148
- Filed: 2013-02-04
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Engine Control and Monitoring
- Inventors: Ronald S. Patrick; Robert Lupul
- Web page: https://patentgrep.com/patent/US20140150528A1

## CPC

- G01N 33/0004: {Gaseous mixtures, e.g. polluted air}
- G01N 33/0037: {NOx}
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

A simplified method for measuring a first property and a second property of an exhaust gas mixture utilizing sensors manufactured for the purpose of measuring a first property, but having a cross-sensitivity to a second property of the exhaust gas mixture. Sensor response characteristics to the first property and the second property are accounted for and used in conjunction with a direct differential measurement between sensors to quantify the concentrations of a first and a second property.

## Claims

### Claim 1

A method for simultaneously measuring a plurality of properties associated with an exhaust gas mixture, said method comprising: combining a plurality of sensors wherein each sensor among said plurality of sensors exhibits known sensitivities to a first property and exhibits known, but measurably different, cross-sensitivities to a second property in an exhaust gas mixture; wherein said plurality of sensors provide differential signals indicative of an amount of said first property and said second property in said exhaust gas mixture; directly reading, between two of said sensors, a differential value.

### Claim 2 (depends on 1)

The method of claim 1, wherein said plurality of sensors comprises at least two NOx sensors, of measurably different cross-sensitivities to NH3, for detecting. said first property, wherein said first property comprises a concentration of NOx; said second property comprises a concentration of NH3 in said exhaust gas mixture.

### Claim 3

A method for simultaneously measuring both the NOx and NH3 quantities in an exhaust gas mixture comprising; a first NOx sensor exhibiting a first known cross-sensitivity to NH3; a second NOx sensor with a second known cross-sensitivity to NH3; said first known cross-sensitivity being measurably different from said second known cross-sensitivity; directly measuring a differential between said first NOx sensor and said second NOx sensor a difference indicative of the quantities of NOx and NH3 in said exhaust gas mixture.

### Claim 4 (depends on 1)

The method of claim 1 wherein said first property comprises NOx and said second property comprises NH3.

### Claim 5 (depends on 2)

The method of claim 2 further comprising: configuring at least one of said NOx sensors to comprise a zirconia-based multilayer sensing element.

### Claim 6 (depends on 1)

The method of claim 1 wherein at least one of said sensors among said plurality of sensors comprises an electrically-based sensor.