Auxialary electric heating apparatus for automobile and auxialary electric heating method for automobile

Abstract

The invention relates to an auxiliary electric heating device used for a vehicle and an auxiliary electric heating method for a vehicle, which comprises a switch part that comprises one or a plurality of switch units and is used for opening and closing a battery voltage by carrying out a switch operation according to a PWM signal; a heater part that comprises one or a plurality of heater units which is connected with the switch units; a current detecting part that detects the current flowing through the heater part; a control part that compares the voltage information of the battery voltage being received with a reference voltage, wherein, if the voltage information is lower than the reference voltage, heating power proportionate to the battery voltage is set as target power, whereas the voltage information is higher than the reference voltage, and preset maximum heating power is set as the target power so as to generate the PWM signal with a PWM duty cycle relative to the set target power and to impose to the switch unit. According to the detecting current of the current detecting part, consumed power actually being consumed is calculated, and the PWM duty cycle of the PWM signalis regulated according to the calculated consumed power and the target power.

Description

technical field [0001] The invention relates to an auxiliary electric heating device and an auxiliary electric heating method for automobiles. Background technique [0002] Typically, an electric car heater is used to heat the car's interior air, or in water-cooled engines to preheat cooling water or heat fuel. [0003] The electric heating device can be used as a PTC (Positive Thermister Coefficient: positive temperature coefficient) heater (Heater) and used as an auxiliary device for the heater unit of the car air conditioner, or it can also be composed of one or more electric heating devices to form a separate independent heating device. [0004] figure 1 It is a block diagram showing a conventional auxiliary electric heating device for automobiles. Such as figure 1 As shown, in the auxiliary electric heating device 10 of the automobile, the microprocessor 16 applies a control signal corresponding to the heating power of the PTC heater 17 preset on the power transisto...

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Problems solved by technology

[0008] However, there is the following problem in the electric heating device of the conventional automobile: sometimes with the change of the external environment such as the operation of the car audio, wiper, interior lighting, and headlights, etc., the PTC heater The predetermined target power cannot be generated, or it will cause excessive power consumption, or the temperature of the auxiliary electric heating device or PTC heater of the car will rise due to excessive power, resulting in damage to the auxiliary electric heating device or PTC heater of the car

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