Abstract: A multisite sensing system including two or more analyte sensors, an interface device, and a shared bus. The interface device may be configured to receive a power signal and generate power for powering the analyte sensors and to convey data signals generated by the analyte sensors. The shared bus connected to the interface device and each of the analyte sensors and configured to provide the power generated by the interface device to the analyte sensors and to provide the data signals generated by the analyte sensors to the interface device. The interface device may be an inductive element. The shared bus may be a two wire, multiplexed bus. The analyte sensors may be spatially separated for analyte sensing at least two different locations. The analyte sensors may generate data signals indicative of the presence and/or amount of the same analyte or of one or more different analytes.

Abstract: A system and related method for controlling reductant dosing in a selective catalyst reduction system includes a chamber containing a catalyst, and a controllable reductant dosing system that includes a controllable injector connected to a reservoir of reductant, and a controller that obtains inlet exhaust temperature, speed, and composition information, for example, from one or more sensors in the exhaust stream. The controller solves a set of coupled equations comprising (i) one-dimensional, steady ammonia mass balance equations and (ii) one-dimensional, steady species mass transfer equations, to calculate a one-dimensional distribution of ammonia storage in the catalyst and a one-dimensional distribution of exhaust species concentrations through the SCR system including a concentration of ammonia and a concentration of one or more nitrogen oxides at the SCR outlet; and uses the solution to control the injector. The method has been found to anticipate ammonia and NOx slip.

Abstract: A sensor apparatus includes an element substrate; a detecting section disposed on an upper surface of the element substrate, the detecting section including a reaction section having an immobilization film to detect an analyte, a first IDT electrode configured to generate an acoustic wave which propagates toward the reaction section, and a second IDT electrode configured to receive the acoustic wave which has passed through the reaction section; and a protective film which covers the first IDT electrode and the second IDT electrode. The upper surface of the element substrate includes a third region which is located between a first region where the first IDT electrode and the second IDT electrode are located and a second region where the reaction section is located. At least part of the third region is lower in level than the first region and the second region.