differential pressure measurement unit, and, liquid volume estimation system

摘要

PROBLEM TO BE SOLVED: To provide a differential pressure measuring unit in which the quantity of liquids in a liquid tank divided into a plurality of accommodation chambers can be estimated by a single unit, and a liquid quantity estimation system including the differential pressure measuring unit.;SOLUTION: A liquid quantity estimation apparatus 7 of a vehicle fuel system 1 includes a vapor-phase diaphragm section 40 which outputs a pressure Pa of a vapor-phase part TA and a first pressure P1 in proportion to an area S(0) of a diaphragm 42, a plurality of liquid-phase diaphragm sections 50 each outputting a total pressure Pc applied to a bottom wall 10b of a plurality of accommodation chambers 11 inside a fuel tank 10 and a second pressure P2 in proportion to an area S of a diaphragm 52, and a differential pressure sensor 30 to which the vapor-phase diaphragm section 40 and the plurality of liquid-phase diaphragm sections 50(1)-50(3) are connected.;COPYRIGHT: (C)2013,JPO&INPIT