Soft start control method and controller for electronic fan

Abstract

The invention discloses a soft start control method and a soft start controller for an electronic fan. In the invention, soft start is realized by a variable duty ratio pulse-width modulation (PMW) wave control power metal oxide semiconductor (MOS) tube consisting of a triangular wave generating circuit, a remote control (RC) charge and discharge circuit and a comparator. A square wave signal u3 can be obtained by computing and designing a triangular wave generation circuit with a fixed frequency and by comparing a voltage u2 with a triangular wave signal u1 serving as a reference; when the voltage value u2 is continuously increased from zero to the peak value of the triangular wave signal u1, the duty ratio of the square wave signal u3 continuously reduces from 100 percent to 0 percent, so a signal of which the duty ratio continuously reduces from 100 percent to 0 percent and is finally stabilized at 0 percent is obtained; and thus, the function of soft start can be realized by usingthe signal to control a power switching tube. The voltage u2 can be generated by the RC charge and discharge circuit, and the time of the duty ratio which reduces from 100 percent to 0 percent can beadjusted by properly regulating the values of matched resistance and capacitance.

Description

technical field [0001] The present invention relates to an electronic control system method and its control device, in particular to an electronic fan soft start control method and controller. The control method and controller are characterized in that the energy storage system is a composite power supply form of a supercapacitor and a power battery . It is especially suitable for buses used in urban public transport. Background technique [0002] At present, the country vigorously advocates the promotion of energy-saving and environmental protection technologies. Doing everything possible to save energy, reduce emissions and reduce fuel consumption is the highlight of the automotive field, especially for new energy vehicles. As a point of energy saving, engine cooling fans tend to choose electronic fans instead of traditional mechanical fans driven by the engine. Because the electronic fan can start and stop reasonably according to the change of the engine's intercooler t...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the current of the existing electronic fan is very large when starting, and the moment of inertia at the moment of starting is particularly large, which is not suitable for frequent starting. An electronic fan start-up control method and device that can effectively limit the start-up current, increase the current slowly until it reaches a steady state, eliminate the instantaneous huge moment of inertia, and fundamentally solve the problem of mechanical damage to the fan

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