Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Reexamination Certificate
2006-07-07
2009-08-18
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
C073S061760
Reexamination Certificate
active
07574900
ABSTRACT:
A liquid state detection sensor in which temperature information of a urea aqueous solution is obtained on the basis of a voltage value acquired after the start of energization of a heating resistor corresponding to a resistance value of the heating resistor (S1-S6). Damage to the heating resistor is prevented by suspending the energization if the thus-obtained temperature is lower than or equal to the freezing point (S7: yes and S8). If the temperature is higher than the freezing point (S7: no), a voltage value corresponding to a resistance of the heating resistor after a lapse of 700 ms (S10and S11) and a urea concentration of the urea aqueous solution are determined from a difference ΔV from the previously acquired voltage value. A more accurate urea concentration can be detected by making a correction using the previously obtained temperature information of the urea aqueous solution (S13-S18).
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Kumazawa Shinji
Sasaki Hisashi
Sasanuma Takeo
Sato Yoshikuni
Tamura Shunsuke
Kolb Nathaniel
NGK Spark Plug Co. Ltd.
Sughrue & Mion, PLLC
Williams Hezron
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