Reductant dosing system with calibration value determined based on data from pressure sensor assembly and method of calibrating a reductant dosing system

A reductant dosing system comprising:

• an injector;
• a fixed displacement pump in fluid communication with the injector;
• a reductant source in fluid communication with the fixed displacement pump;
• a pressure sensor assembly configured to detect a pressure of reductant in the reductant dosing system, and to store a calibration value of the fixed displacement pump;
• and
• a controller communicatively coupled to the fixed displacement pump and to the pressure sensor assembly, wherein the controller is configured to receive from the pressure sensor assembly data that includes the detected pressure of the reductant and the calibration value, and to calculate a flow rate of the fixed displacement pump based on at least the detected pressure and the calibration value,
• wherein the controller is configured to determine the calibration value by decoding a bit stream on an analog voltage output of the pressure sensor assembly, wherein the bit stream is sent from the pressure sensor assembly for a predetermined amount of time, after which the analog voltage output of the pressure sensor assembly is a pressure voltage signal correlated to a pressure sensor reading of the pressure sensor assembly.

A method of calibrating a reductant dosing system, the method comprising:

• detecting, by a pressure sensor assembly, a pressure of reductant in the reductant dosing system;
• receiving, by a controller from the pressure sensor assembly, data that includes the detected pressure of the reductant and a calibration value;
• operating, by the controller, a fixed displacement pump based on at least the detected pressure of the reductant and the calibration value;
• and
• determining the calibration value by decoding a multiplexed signal on an analog voltage output of the pressure sensor assembly, wherein the multiplexed signal is a combination of a bit stream of the calibration value and an analog voltage output of the pressure sensor assembly correlated to a pressure detected by the pressure sensor assembly.

A method of calibrating a reductant dosing system, the method comprising:

• detecting, by a pressure sensor assembly, a pressure of reductant in the reductant dosing system;
• receiving, by a controller from the pressure sensor assembly, data that includes the detected pressure of the reductant and a calibration value;
• operating, by the controller, a fixed displacement pump based on at least the detected pressure of the reductant and the calibration value;
• and
• determining the calibration value by decoding a bit stream on an analog voltage output of the pressure sensor assembly, wherein the bit stream is sent from the pressure sensor assembly for a predetermined amount of time, after which the analog voltage output of the pressure sensor assembly is a pressure voltage signal correlated to a pressure sensor reading of the pressure sensor assembly.