| 摘要 |
<p>A solid state electrochemical cell (10a) for measuring the concentration of a component of a gas mixture (12) includes a first semiconductor electrode (14) and a second semiconductor electrode (16) formed from first and second semiconductor materials, respectively. The materials are selected so as to undergo a change in resistivity upon contacting a gas component, such as CO or NO. An electrolyte (18) is provided in contact with the first and second semiconductor electrodes. A reference cell can be included in contact with the electrolyte. Preferably, a voltage response of the first semiconductor electrode when exposed to the component is opposite in slope direction to that of the second semiconductor electrode to produce a voltage response equal to the sum of the absolute values of the individual voltages generated. A combustion engine includes an emission sensor for measuring pollutants and a feedback and control system uses measured pollutant concentrations to direct adjustment of engine combustion conditions.</p> |
