Method and device for detecting low voltage heater of automobile air conditioner

Abstract

The invention discloses a method for detecting a low voltage heater of an automobile air conditioner, which is used for judging whether the low voltage heater is a qualified product by testing wether peak currents of different gears of the low voltage heater under a constant voltage are in a preset range. The invention also discloses a device for detecting the low voltage heater of the automobile air conditioner, which comprises a low voltage heater connector, a power supply unit, an earth terminal, a data acquisition processing unit, a display unit and a printing unit, wherein the low voltage heater connector is used for connecting the low voltage heater; the power supply unit and the earth terminal are used for providing a power supply and a grounding wire for the low voltage heater to be detected; the data acquisition processing unit is used for acquiring and processing data; the display unit is used for setting test parameters and displaying a test result; and the printing unit is used for printing a bar code. According to the method and the device for detecting the low voltage heater, which are disclosed by the invention, the on-line test on the heating power of the low voltage heater is implemented on an air conditioner production line final inspection bed; and due to the adoption of a three-gear alternate testing method, the test data is ensured to comprehensively reflect the heating performance of the low voltage heater.

Description

technical field [0001] The invention relates to the field of heat exchange, in particular to a method and device for detecting a low-voltage heater of an automobile air conditioner. Background technique [0002] At present, there is a low-voltage heater (LV-PTC) component in the air-conditioning system of hybrid electric vehicles. Its function is electric auxiliary heating. The heater inputs warm air into the car through the air conditioner. Ordinary heaters use a simple hair dryer principle, which may cause potential dangers such as personal burns or deformation of air-conditioning plastic parts, while low-voltage heaters are ceramic heaters with automatic temperature control, which use a special ceramic material. When the body is energized, because the room temperature resistance is small, the initial current is large, which can make the heating body heat up quickly, resulting in a rapid increase in its own resistance value and entering the transition zone. At this time, ...

AI Technical Summary

Problems solved by technology

Ordinary heaters use a simple hair dryer principle, which may cause potential dangers such as personal burns or deformation of air-conditioning plastic parts, while low-voltage heaters are ceramic heaters with automatic temperature control, which use a special ceramic material. When the body is energized, because the room temperature resistance is small, the initial current is large, which can make the heating body heat up quickly, resulting in a rapid increase in its own resistance value and entering the transition zone

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