PTC heater control system and method for automobile air conditioner controller

Abstract

The invention provides a PTC heater control system and method for an automobile air conditioner controller. The PTC heater control system comprises a PTC heater target temperature determining module, a PTC heater signal control module, a PWM output climbing setting module and a PTC heater switching-on control module. The PTC heater target temperature determining module is used for superposing a first temperature compensation value and a second temperature compensation value with an air outlet automobile internal target temperature as a basic value so as to determine the target temperature of a PTC heater. The PTC heater signal control module is used for setting the PWM duty cycle of the PTC heater with a PI control method. By regulating the target temperature of the PTC heater in real time, the energy conservation of an automobile air conditioner system is guaranteed to the maximum; meanwhile, a whole automobile high-voltage power supply system, the PTC heater and an air conditioner case plastic shell are effectively protected, and the use safety of the automobile air conditioner system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of automobile air-conditioning control, in particular to a PTC heater control system and method of an automobile air-conditioning controller. Background technique [0002] With the gradual depletion of oil resources and the increasingly serious environmental pollution, in order to improve the utilization of resources and protect the environment, electric vehicles powered by batteries have emerged. The air-conditioning systems in electric vehicles use emerging PTC heaters (PTC: a ceramic electric heater) The abbreviation of the component) replaces the Heater core (heating air box) of a traditional car to provide heating for the car. [0003] The PTC heater uses high-voltage electricity as the constant power supply, and its heating degree is controlled by the PWM signal. The forced convection of the air is used as the main heat exchange method by using the blower to agitate the air to flow through the PTC elec...

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Problems solved by technology

[0003] The PTC heater uses high-voltage electricity as the constant power supply, and its heating degree is controlled by the PWM signal. The forced convection of the air is used as the main heat exchange method by using the blower to agitate the air to flow through the PTC electric heating element; When controlling, the user's setting of the air-conditioning system is often simply considered, and the PTC heater temperature or PWM signal is fixed at a certain value. However, if the PTC heater temperature or PWM signal cannot be set according to the different ambient temperatures , but to fix the PTC heater temperature or PWM signal at a certain value, it will inevitably cause waste of resources; and if the PTC heater temperature or PWM signal is fixed at a certain value, the surface temperature of the PTC heater may be too high. High, with the risk of damaging the plastic casing of the air conditioner

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