PTC (positive temperature coefficient) auxiliary heating control system of automobile air conditioner

Abstract

The invention discloses a PTC (positive temperature coefficient) auxiliary heating control system of an automobile air conditioner. The PTC auxiliary heating control system is characterized in that the control system is an air conditioner controller and used for driving and controlling a PTC heater to work after acquiring information of an external temperature sensor, an engine water temperature sensor and an engine velocity sensor simultaneously; and a PTC-CRT port of the air conditioner controller of the air conditioner controller is connected into a coil of a PTC relay, and the PTC relay is connected in series with a power supply loop of the PTC heater and a power supply, so that the control on the PTC heater is realized. Due to the adoption of the structure, the PTC auxiliary heating control system has the advantages as follows: the safety control on the working state of the PTC heater is realized; and the control system is simple in structure, safe and reliable; and the detection of the PTC relay is realized, and the condition that the PTC heater continues to work due to contact adhesion caused by the poor quality and ageing of the PTC relay is avoided.

Description

technical field [0001] The invention relates to the field of design and manufacture of automobile air conditioners, in particular to a PTC auxiliary heating control system for automobile air conditioners. Background technique [0002] With the need for energy saving worldwide, it has become a trend for various automobile manufacturers to reduce engine displacement. In small-displacement vehicles and some gasoline vehicles and diesel vehicles, in order to solve the problem that the engine water temperature is low when the vehicle engine is just started in winter and cannot be defrosted and heated in time, the automotive air conditioning system often uses PTC heaters as auxiliary heating. Turn it off when the water temperature rises to a certain temperature. [0003] PTC is the abbreviation of Positive Temperature Coefficient, which generally refers to semiconductor materials or components with a large positive temperature coefficient. Usually, the PTC we refer to refers to a...

AI Technical Summary

Problems solved by technology

The PTC electric heater in the HVAC of the automobile air conditioner has a large power, usually above 1KW, and the energy must be provided by the automobile battery. Therefore, when designing the PTC control circuit, it is necessary to Make sure to know whether the PTC heater is in a non-working state, otherwise, if the PTC is still in a working state, it will consume the electric energy of the battery and bring adverse effects to the vehicle power system. If it is not discovered in time, the electric energy of the battery will be consumed in a short time , so that the car will not start next time

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