US Patent Application No. 13/604,279, Fluid delivery apparatus with flow rate sensing means

 

 

 

This technology is about a fluid delivery apparatus with a flow sensing means for delivering a first fluid into a second fluid. In a fluid delivery apparatus using a common rail method, which produces a pulsated flow, the flow sensing means generates sensing signals indicative of the flow rate and the temperature of the second fluid, the delivery rate of the first fluid, and the evaporating rate of the first fluid, while in a fluid delivery apparatus using a pump metering method, the flow sensing means is able to provide a sensing signal indicative of the delivery rate of the first fluid. The sensing signals can be used in a feedback control for controlling delivery rate, in limiting delivery rate according to the evaporation capability of the first fluid, and in a diagnostic system detecting failures and abnormalities in the fluid delivery apparatus. An example of such a fluid delivery apparatus is a reductant delivery apparatus in an exhaust treatment system of an internal combustion engine.

Uniqueness and benefits of this technology:
1. A multi-functional hot-wire sensor that is able to detect exhaust flow rate, exhaust temperature, dosing flow rate, and evaporating rate of the reductant fluid in a reductant dosing system of an internal combustion engine;
2. The sensing values can be used in controlling reductant delivery;
3. The sensing values can be further used in detecting issues in the reductant dosing system.

 

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