Fluid injection control system

摘要

An exhaust aftertreatment system may include a tank, an injector, a supply conduit, a pump, a pressure sensor, and a control module. The tank may contain a volume of a fluid. The injector may be configured to inject the fluid into a stream of exhaust gas discharged from the combustion engine. The supply conduit may fluidly connect the tank and the injector. The pump may pump the fluid from the tank to the injector. The control module may be in communication with the pressure sensor and the pump and may control the pump based on first and second measurements from the pressure sensor. The first measurement may be indicative of a first pressure within the supply conduit when the pump is operating. The second measurement from the pressure sensor may be indicative of a second pressure within the supply conduit when the pump is not operating.

主权项

1. An aftertreatment system for treating exhaust gas discharged from a combustion engine, the aftertreatment system comprising:
a tank containing a volume of a fluid; an injector configured to inject the fluid into a stream of exhaust gas discharged from the combustion engine; a supply conduit fluidly connecting the tank and the injector; a pump pumping the fluid from the tank to the injector; a pressure sensor engaging the supply conduit; and a control module in communication with the pressure sensor and the pump and controlling the pump based on first and second measurements from the pressure sensor, the first measurement indicative of a first pressure within the supply conduit when the pump is operating, the second measurement from the pressure sensor indicative of a pressure head within the supply conduit when the pump is not operating, the controller determining a correction value based on the second measurement and applying the correction value to future pressure sensor measurements when the pump is operating to account for the pressure head.