Patent ID: 8701389
Filing Date: 2014-04-22
Classification: F01N,Y02A,Y02T

Abstract:
1. A reagent injector control system for a vehicle, comprising: a first electronic circuit that monitors current through a reagent injector during an injection control cycle, that generates a pulse width modulation (PWM) signal based on an amount of reagent to be injected during the injection control cycle, and that at least one of selectively increases and selectively decreases a duty cycle of the PWM signal during the injection control cycle based on a comparison of the current and a predetermined current; a second electronic circuit that selectively enables and disables the current based on the PWM signal; and a sense resistor having a first terminal connected to the second electronic circuit and a second terminal connected to the reagent injector, wherein the sense resistor is separate from the reagent injector, wherein the first electronic circuit determines the current based on a voltage across the sense resistor, wherein the reagent injector opens and injects a reagent into an exhaust system based on the current, wherein the exhaust system receives exhaust output from an engine, and wherein the reagent reacts with nitrogen oxides (NOx).