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US 2010/0161242 A1Published application
Exhaust gas sensing system and method for determining concentrations of exhaust gas constituents
AssigneeDelphi Technologies, Inc.
InventorsDa Yu Wang, Sheng Yao, David D. Cabush, Walter T. Symons, Robert J. Farhat
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Abstract
An exhaust gas sensing system and a method for determining concentrations of exhaust gas constituents are provided. The exhaust gas sensing system includes a NH3 sensing cell, a NO2 sensing cell, a NOx pumping cell, and a current sensor that detects an electrical current flowing through the NOx pumping cell. A computer determines a NO2 concentration value, a NH3 concentration value, a NO concentration value, and a NOx concentration value based on signals from the NH3 sensing cell, the NO2 sensing cell, and the current sensor.
Claims4
An exhaust gas sensing system, comprising:
- a NH3 sensing cell configured to generate a first voltage indicative of a combination of a NH3 concentration and a NO2 concentration in exhaust gases communicating with the NH3 sensing cell;
- a NO2 sensing cell configured to generate a second voltage indicative of a NO2 concentration in exhaust gases communicating with the NO2 sensing cell;
- a NOx pumping cell configured to generate an electrical current indicative of combination of a NO concentration, a NO2 concentration, and a NH3 concentration in exhaust gases communicating with the NOx pumping cell;
- a current sensor configured to measure the electrical current flowing through the NOx pumping cell and to output a current measurement signal indicative of a magnitude of the electrical current;
- a computer configured to receive the first voltage, the second voltage, and the current measurement signal, the computer further configured to determine a NO2 concentration value indicative of the NO2 concentration in the exhaust gases communicating with the NO2 sensing cell based on the second voltage;
- the computer further configured to determine a NH3 concentration value indicative of the NH3 concentration in the exhaust gases communicating with the NH3 sensing cell based on the first voltage and the NO2 concentration value;
- the computer further configured to determine a NO concentration value indicative of a NO concentration in the exhaust gases communicating with the NOx pumping cell based on the current measurement signal, the NO2 concentration value, and the NH3 concentration value;
- the computer further configured to determine a NOx concentration value based on the NO concentration value and the NO2 concentration value;
- and
- the computer further configured to store the NO2 concentration value, the NH3 concentration value, the NO concentration value, and the NOx concentration value in a memory device.
7 more elements
A method for determining concentrations of exhaust gas constituents, comprising:
- generating a first voltage utilizing a NH3 sensing cell that is indicative of a combination of a NH3 concentration and a NO2 concentration in exhaust gases communicating with the NH3 sensing cell;
- generating a second voltage utilizing a NO2 sensing cell that is indicative of a NO2 concentration in exhaust gases communicating with the NO2 sensing cell;
- generating an electrical current utilizing a NOx pumping cell that is indicative of combination of a NO concentration, a NO2 concentration, and a NH3 concentration in exhaust gases communicating with the NOx pumping cell;
- measuring the electrical current flowing through the NOx pumping cell utilizing a current sensor and outputting a current measurement signal from the current sensor indicative of a magnitude of the electrical current;
- receiving the first voltage, the second voltage, and the current measurement signal at a computer;
- determining a NO2 concentration value indicative of the NO2 concentration in the exhaust gases communicating with the NO2 sensing cell based on the second voltage, utilizing the computer;
- determining a NH3 concentration value indicative of the NH3 concentration in the exhaust gases communicating with the NH3 sensing cell based on the first voltage and the NO2 concentration value, utilizing the computer;
- determining a NO concentration value indicative of a NO concentration in the exhaust gases communicating with the NOx pumping cell based on the current measurement signal, the NO2 concentration value, and the NH3 concentration value, utilizing the computer;
- determining a NOx concentration value based on the NO concentration value and the NO2 concentration value, utilizing the computer;
- and
- storing the NO2 concentration value, the NH3 concentration value, the NO concentration value, and the NOx concentration value in a memory device, utilizing the computer.
8 more elements
Dependencies are inferred from the claim text.