公开(公告)号：US10605644B2

公开(公告)日：2020-03-31

申请号：US15949669

申请日：2018-04-10

Applicant: COAVIS

Inventor： Dong Heon Mo ,  Jin Hwa Jung ,  In Seok Sohn ,  Hyun Tae Lee

IPC: G01F23/296 ,  G01F23/26 ,  G01F23/00 ,  F01N3/20 ,  F01N11/00

Abstract: Provided is a complementary apparatus for measuring a level of urea water includes an ultrasonic measurement unit installed inside a urea water tank to measure a level of urea water using an ultrasonic wave, an inductance measurement unit including a winding coil wound in a vertical direction inside the urea water tank and having a winding density varied toward one side, and measuring a level of urea water using inductance measured as a current is applied to the winding coil, a temperature measurement unit installed in the urea water tank and measuring a temperature, and a controller determining whether to operate the ultrasonic measurement unit or the inductance measurement unit according to the temperature measured by the temperature measurement unit or selectively outputting a level of urea water measured by the ultrasonic measurement unit and the inductance measurement unit.