Control method and device of car PTC heating system

Abstract

The invention provides a control method and device of a car PTC heating system. The control method comprises the steps that S1, the target output air temperature value of an air outlet is calculated according to collected sensor signals and user set temperature; S2, the target water temperature of the PTC heating system is acquired according to the target output air temperature value; S3, the water temperature of the PTC heating system is controlled to be maintained at target water temperature. The target output air temperature value of the air outlet is calculated according to the collected sensor signals and the user set temperature, the proper target water temperature is further calculated, the target water temperature acquired under many conditions is low and is not on the high temperature section, and energy is saved on the premise of guaranteeing the comfort of a whole car.

Description

technical field [0001] The invention relates to the technical field of new energy automobiles, in particular to a control method and device for an automobile PTC heating system. Background technique [0002] Electric vehicles generally do not have fuel engines, so electric vehicle air conditioners cannot use the waste heat of fuel engines for heating like traditional vehicles. At present, domestic automobile manufacturers mainly use PTC (Positive Temperature Coefficient, positive temperature coefficient) heating elements for heating. The PTC heating system is divided into water heating PTC and air PTC. Compared with the two, air PTC is less safe. Therefore, water heating PTC is more widely used. like figure 1 As shown, the working principle of the water heating PTC is to heat the cooling water through the PTC heater, and the cooling water will bring heat into the passenger compartment through the heating core inside the HVAC (Heating, Ventilating and Air Conditioning, heat...

AI Technical Summary

Problems solved by technology

However, since the temperature collected by the temperature sensor inside the car usually has a large gap with the temperature inside the car, other methods are required to correct the collected value of the sensor, and the correction method is often very complicated, and it cannot be guaranteed that the corrected value can follow the temperature inside the car in real time. The temperature change, in some working conditions, the difference between the two will be relatively large, therefore, it will lead to the failure of the PTC control method and affect the comfort of the vehicle air conditioner, which has great limitations

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