Qeys Instruments develops new technologies for engine components, including sensors, pumps, and injectors used in engine systems and engine exhaust gas processing systems, and control and OBD methods. Our goal is to make engine systems clean, energy efficient, and low cost. 







Flow Controls
System Controls

Two-stage Pulse Signal Control

 Reductant Dosing Device with Purging Means

 Diagnosis and controls of a fluid delivery apparatus with hydraulic buffer


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Patents in the market 



US Patent No. 7,896,257, Fuel injector with real-time feedback control.



US Patent No. 8,444,060, Fuel injector with deterioration detection.



Air driven hydraulic pump with pressure control

 Air driven reductant delivery system