PWM (Pulse Wavelength Modulation) speed regulating module for cooling fan of automobile engine

Abstract

The invention discloses a PWM (Pulse Wavelength Modulation) speed regulating module for a cooling fan of an automobile engine. The PWM speed regulating module comprises a control signal processing unit for modulating and demodulating an input low-frequency PWM signal and a driving amplifying unit for performing driving amplification on a signal output by the control signal processing unit, wherein the control signal processing unit comprises a modulating wave generating unit and a carrier wave generating unit; the driving amplification unit comprises a PWM generating and amplifying unit; and the output ends of the modulating wave generating unit and the carrier wave generating unit are connected with the input end of the PWM generating and amplifying unit. The PWM speed regulating module has the advantages of low manufacturing cost, very short research-development-production period due to a simple circuit and additional function of monitoring the current, temperature and power voltage of a driving motor of the cooling fan in real time; and moreover, software programming is not required, so that the development difficulty is lowered.

Description

technical field [0001] The invention relates to a speed regulating device, in particular to a PWM speed regulating module used for a cooling fan of an automobile engine. Background technique [0002] The cooling fan is an important part of the automobile engine, and it is an important part to ensure the continuous and reliable operation of the engine, give full play to the engine performance, and prolong the service life of the engine. Existing cooling fan speed regulation technologies mainly include mechanical, hydraulic, clutch, electromagnetic clutch, and motor-driven solutions, and electronic control of automobiles has become an irreversible development trend. [0003] Most of the current control solutions of manufacturers mainly adopt custom ASIC and MCU solutions. ASIC solutions are highly integrated and control peripheral circuits are simple. Manufacturers such as ON and ST can provide this kind of service, and the customization cost is expensive, the cycle is long, ...

AI Technical Summary

Problems solved by technology

[0003] Most of the current control schemes of manufacturers mainly adopt customized ASIC and MCU schemes. ASIC schemes are highly integrated and control peripheral circuits are simple. Manufacturers such as ON and ST can provide this kind of service, and the customization cost is expensive, the cycle is long, and the function is unique, which is not conducive to product development and improvement; the MCU solution adopts digital software intelligent control, powerful functions, and is very suitable for product development and improvement. However, it needs to provide linear regulated power supply and relatively complex peripheral circuits, the cost is high, and software programming is required, which increases the difficulty of product development

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