Patent ID: 7469574
Filing Date: 2008-12-30
Classification: F01N,F02D,G01N,Y02T

Abstract:
1. A liquid type identifying method, which identifies whether or not a liquid to be measured which is an aqueous solution contains a predetermined solute by sensing heat generated by energization with a temperature sensor, the identification of whether or not the liquid to be measured contains a predetermined solute being made based on a combination of a liquid-type-corresponding first voltage value corresponding to a difference between an initial temperature of the temperature sensor and a first temperature thereof obtained at the time point after a first time period has elapsed from a start of the energization and a liquid-type-corresponding second voltage value corresponding to a difference between the initial temperature of the temperature sensor and a second temperature thereof obtained at the time point after a second time period, which is longer than the first time period, has elapsed from the start of the energization.