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A method for an electric heating device and detecting this electric heater overheating

An electric heater and overheating technology, which is applied in the direction of electric heating devices, heating/cooling equipment, electrical components, etc., can solve the problems of shortening the service life of PTC resistance wires, and achieve the effect of ensuring functional safety

Active Publication Date: 2022-08-09
DAVID & BAADER DBK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the maximum allowable operating point is usually 600°C, so that the average operating point should not exceed about 400°C, so as not to unduly shorten the service life of the PTC resistance wire

Method used

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  • A method for an electric heating device and detecting this electric heater overheating
  • A method for an electric heating device and detecting this electric heater overheating
  • A method for an electric heating device and detecting this electric heater overheating

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Embodiment Construction

[0027] as described below figure 2 The illustrated electric heater 1 according to the invention is preferably designed as a water heater, for example, which is provided in the circulation of a working fluid, such as cooling water, in a vehicle. For this purpose, the electric heater 1 is preferably designed as a tubular heating body (RHK) or a cylindrical heating body with wire-shaped heating elements 2 (see figure 2 ). Corresponding water heaters are known, for example, from the applicant's document DE 10 2010 060 446 A1, so that with regard to the specific structure of said water heater, reference can be made to the statements in this document. However, the specific structure described plays only a small role in understanding the present invention, as different heater types can be designed and operated in accordance with the present invention.

[0028] Said electric heater 1 is preferably supplied with a voltage from the electrical system of the vehicle, wherein the elect...

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PUM

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Abstract

The invention relates to an electric heater (1) for heating a fluid flow, having a heating element (2) and a control device (3) for controlling the heat output generated by the heating element (2), wherein, Said heating element (2) has an inductance (L_RHK), which varies with temperature, and at the same time, an overheat detection device (4) is provided, which is designed to detect the flow through the inductance (L_RHK) caused by the change The change in the current of the heating element (2) is compared with a predefined limit value and the overheating of the electric heater (1) is determined when the limit value is exceeded. The invention also relates to a method for detecting overheating of such an electric heater (1).

Description

technical field [0001] The present invention relates to an electric heater and a method for detecting overheating of such an electric heater. Background technique [0002] Such heaters can be used, for example, in motor vehicles, for heating (heating) of room air in the passenger compartment and for heating of batteries, for preheating cooling water for water-cooled engines, for preheating fuel cells in self-ignition internal combustion engines Spark plugs, for heating fuel, for defrosting working fluids, such as window washer fluid or headlamp washer fluid, and urea solution for SCR catalytic converters. In addition, such heaters can be used in so-called white goods such as dryers or washing machines. [0003] Especially in modern vehicles, such as electric, hybrid or fuel cell vehicles which use high voltages in their electrical systems, the heating circuit has to be heated due to a lack of or only temporarily available heat sources, eg from internal combustion engines. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B1/02B60H1/22
CPCH05B1/0236
Inventor A·克雷默R·黑克
Owner DAVID & BAADER DBK