Wiper blade comprising a heating electrical circuit and a PTC fuse

Abstract

The invention proposes a wiper blade (10) of a motor vehicle, comprising a heating electrical circuit (30) comprising at least one heating resistive element, which is connected to terminals (36) for supplying electric current, and a component for regulating the electric power supply current, which is a resettable fuse with a positive temperature coefficient (50), known as a PTC fuse. The PTC fuse(50) is, for example, a surface-mounted component, known as a CMS component, which is electrically connected to two belonging electrical connecting areas (44, 46).

Description

Technical field [0001] The invention relates to a wiper blade, which includes a heating circuit embodied in the form of at least one heating resistance element, and includes a component for adjusting the power supply current of the heating circuit. Background technique [0002] In a known manner, the wiper blades of motor vehicles can be heated, in particular for deicing in winter, or using the heat generated by a heating device to deice the outer surface of windows that the wiper must clean. [0003] When the wiper blade includes an internal channel for distributing windshield washer liquid, the heated wiper blade can additionally make it possible to be heated before atomizing or spraying the windshield washer liquid onto the outer surface of the window, which also makes it possible to simplify the window The deicing operation makes it possible to avoid the use of manual scrapers. [0004] In a known manner, a wiper blade of the "flat blade" type comprises a body with a longitudina...

AI Technical Summary

Problems solved by technology

[0015] Assuming that the sensor is to provide incorrect information, for example, the vehicle is traveling at 150 km / h while the vehicle is stationary, or the outside temperature is negative in summer, the EMC can activate an inappropriate supply voltage, such as a 16 volt Voltage instead of reduced voltage when the vehicle is stopped, which can bring about a very significant temperature increase and can lead to degradation and even damage to the heating film that equips the wiper blade

[0016] For example, the effect could be a constant heating of the wiper blade over +5°C, possibly in hot summer with ambient temperatures exceeding +30°C, the potential risk could lead to hot spots, short circuits, physical degradation of the wiper blade, and even in catch fire in worse case

[0017] Other functions of the vehicle are thus not implemented in a functionally degraded mode, for example in the event that wrong information is supplied by the outside temperature or vehicle travel speed sensors, or in the event of a failure of such sensors

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