US 2021/0080422 A1Published application

Liquid heater apparatus

AssigneeDenso Wave Incorporated

InventorKatsuhiro MATSUNAMI

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Abstract

A liquid heater apparatus increases the temperature of an A/F sensor up to a target temperature by a target heating time. The liquid heating apparatus such as a gas water heater uses the A/F sensor for detecting an oxygen density in a heating tube. An MPU of a controller count a time from beginning by using a timer and decides whether a moisture on the A/F sensor is evaporated by using the change of a current for a heater portion of the A/F sensor. When the MPU decides the A/F sensor is dried out, the MPU counts the time from the beginning to such time tα as a drying time and setts a heating completing time by reducing the drying time from the predetermined target time. The MPU so controls the heating portion that the temperature of the sensor portion becomes the target temperature by the heating completing time.

Claims5

Dependent claims

The liquid heater apparatus comprising:

a heating tube in which a fuel is burned for heating a liquid,
an A/F sensor for detecting an oxygen density within and/or close to said heating tube,
a heater portion for heating said A/F sensor,
a detecting portion for measuring a current for said heater portion, and
a controller for controlling an electric energy for said heater portion in such a manner that;
a heating time from beginning time when said heater portion starts to be heated to a reaching time when temperature of said A/F sensor reaches to a target temperature is preliminary set as a target heating time,
whether a moisture on said A/F sensor is completely evaporated is decided by a change of gradient of the current measured by said detecting portion,
a time from beginning of heating of said heater portion is count by a timer and the time from the beginning to a time when the moisture on said A/F sensor is completely evaporated is set as a drying time,
a heating completing time is set by reducing the drying time from the target heating time, and
said heating portion heats said A/F sensor so as to reach the target temperature by the heating completing time.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/007,640Filed 31 Aug 2020
Priority: JP 2019-16833017 Sep 2019
Published: 18 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01N 27/4067
Cells and probes with solid electrolytes: means for heating or controlling the temperature of the solid electrolyte
Y02B 30/00
Energy efficient heating, ventilation or air conditioning [hvac]
G01N
Investigating or analysing materials by determining their chemical or physical properties
Y02B
Energy-efficient buildings

Family

US 11,898,982 B2Related patent
US 2021/0080422 A1This patent

From the US filing history. Foreign family members aren’t listed.

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