Exhaust-gas heater

Patent metadata

Field	Value
Publication number	US-12520384-B2
Application number	US-202217828704-A
Country	US
Kind code	B2
Filing date	May 31, 2022
Priority date	May 31, 2021
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

An exhaust-gas heater for an exhaust system for an internal combustion engine includes a heating conductor with a first supply-voltage terminal, a second supply-voltage terminal and a heating region extending between the first supply-voltage terminal and the second supply-voltage terminal. A voltage-measuring section is integrated into the heating region.

First claim

What is claimed is:

1 . An exhaust-gas heater for an exhaust system for an internal combustion engine, the exhaust-gas heater comprising:
a heating conductor having a first supply-voltage terminal and a second supply-voltage terminal; said heating conductor defining a heating region extending between said first and said second supply-voltage terminals; a voltage-measuring section integrated into said heating region including a measuring resistor, said voltage-measuring section exhibiting a resistance characteristic different from a resistance characteristic of said heating region; said heating region defining first and second heating-region portions; said measuring resistor having first and second terminal regions connected to said first and second heating-region portions, respectively, leading to corresponding ones of said first and second supply-voltage terminals; and, said measuring resistor being electrically connected in series with said first heating-region portion and with said second heating-region portion;
wherein at least one of the following applies:
said voltage-measuring section exhibits an electrical resistance changing with greater intensity in a temperature-dependent manner than said heating region within an operating temperature range; and
said voltage-measuring section exhibits a lower electrical resistance than said heating region within said operating temperature range.

2 . The exhaust-gas heater of claim 1 , wherein said measuring resistor further includes a first voltage-measuring terminal formed thereon in a region of said first terminal region and a second voltage-measuring terminal formed thereon in a region of said second terminal region.

3 . The exhaust-gas heater of claim 1 , wherein the voltage-measuring section exhibits a PTC resistance characteristic or an NTC resistance characteristic.

4 . An exhaust-gas heating system for an exhaust system for an internal combustion engine, the exhaust-gas heating system comprising:
at least one exhaust-gas heater for accommodating a flow of exhaust gas (A) therethrough; said exhaust-gas heater including: a heating conductor having a first supply-voltage terminal and a second supply-voltage terminal; said heating conductor defining a heating region extending between said first and said second supply-voltage terminals; a voltage-measuring section exhibiting a resistance characteristic different from a resistance characteristic of said heating region and being integrated into said heating region; said voltage-measuring section including: a measuring resistor; said heating region defining first and second heating-region portions; said measuring resistor having first and second terminal regions connected to said first and second heating-region portions, respectively, leading to corresponding . . . ones of said first and second supply-voltage terminals; said measuring resistor being electrically connected in series with said first heating-region portion and with said second heating-region portion; said measuring resistor further including a first voltage-measuring terminal formed thereon in a region of said first terminal region and a second voltage-measuring terminal formed thereon in a region of said second terminal region; said exhaust-gas heating system further including: a control arrangement for registering a measuring voltage between said first and second voltage-measuring terminals and for applying a supply voltage between said first and second supply-voltage terminals as a function of the registered measuring voltage; wherein at least one of the following applies: said voltage-measuring section exhibits an electrical resistance changing with greater intensity in a temperature-dependent manner than said heating region within an operating temperature range; and, said voltage-measuring section exhibits a lower electrical resistance than said heating region within said operating temperature range.

5 . The exhaust-gas heating system of claim 4 , wherein said control arrangement is configured to apply the supply voltage to said first and second supply-voltage terminals as a function of the registered measuring voltage and a set measuring voltage or a set temperature in the region of said voltage-measuring section.

6 . An exhaust system for an internal combustion engine, the exhaust system comprising:
an exhaust-gas heating system including: at least one exhaust-gas heater for accommodating a flow of exhaust gas (A) therethrough; said exhaust-gas heater including: a heating conductor having a first supply-voltage terminal and a second supply-voltage terminal; said heating conductor defining a heating region extending between said first and said second supply-voltage terminals; a voltage-measuring section exhibiting a resistance characteristic different from a resistance characteristic of said heating region and being integrated into said heating region; said voltage-measuring section including: a measuring resistor; said heating region defining first and second heating-region portions; said measuring resistor having first and second terminal regions connected to said first and second heating-region portions, respectively, leading to corresponding ones of said first and second supply-voltage terminals; said measuring resistor being electrically connected in series with said first heating-region portion and with said second heating-region portion; said measuring resistor further including a first voltage-measuring terminal formed thereon in a region of said first terminal region and a second voltage-measuring terminal formed thereon in a region of said second terminal region; said exhaust-gas heating system further including: a control arrangement for registering a measuring voltage between said first and second voltage-measuring terminals and for applying a supply voltage between said first and second supply-voltage terminals as a function of the registered measuring voltage; wherein at least one of the following applies: said voltage-measuring section exhibits an electrical resistance changing with greater intensity in a temperature-dependent manner than said heating region within an operating temperature range; and, said voltage-measuring section exhibits a lower electrical resistance than said heating region within said operating temperature range.

7 . A method for operating an exhaust-gas heater including: a heating conductor having a first supply-voltage terminal and a second supply-voltage terminal; said heating conductor defining a heating region extending between said first and said second supply-voltage terminals; a voltage-measuring section exhibiting a resistance characteristic different from a resistance characteristic of said heating region and being integrated into said heating region; said voltage-measuring section including:
a measuring resistor, said heating region defining first and second heating-region portions, said measuring resistor having first and second terminal regions connected to said first and second heating-region portions, respectively, leading to corresponding ones of said first and second supply-voltage terminals, said measuring resistor being electrically connected in series with said first heating-region portion and with said second heating-region portion, and, said measuring resistor further including a first voltage-measuring terminal formed thereon in a region of said first terminal region and a second voltage-measuring terminal formed thereon in a region of said second terminal region; wherein at least one of the following applies: said voltage-measuring section exhibits an electrical resistance changing with greater intensity in a temperature-dependent manner than said heating region within an operating tem

Assignees

• Purem GmbH

Inventors

• Brenner Holger

Classifications

• H05B2203/035

  Electrical circuits used in resistive heating apparatus · CPC title

• H05B2203/022

  Heaters specially adapted for heating gaseous material · CPC title

• G05D23/24

  the sensing element having a resistance varying with temperature, e.g. a thermistor · CPC title

• F01N2900/0602

  Electrical exhaust heater signals · CPC title

• F01N9/00

  Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) · CPC title