Calculating method of rotary speed of fan in power battery for hybrid electric vehicle

Abstract

The invention provides a calculating method of the rotary speed of a fan in a power battery for a hybrid electric vehicle. A fan with LFm shift is adopted, wherein m is an integer from 0-7, and the larger the m value is, the higher the shift of the fan is; at a certain moment, firstly, the comprehensive fan shift at the moment is obtained according to the temperature change of a battery pack in a vehicle; the maximum fan shift corresponding to the vehicle speed at the moment is obtained according to different vehicle speeds; then, the minimum value in the comprehensive fan shift and the maximum fan shift corresponding to the vehicle speed is taken as the last fan shift at the moment; finally, the duty ratio relationship of the last fan shift and the pulse width modulating wave is converted into corresponding duty ratio of the pulse width modulating wave, and the rotation speed of the fan at the moment can be controlled by controlling a fan operation control port. According to the method, the rotation speed of the fan can be dynamically controlled.

Description

technical field [0001] The invention relates to a method for calculating the rotational speed of a fan, in particular to a method for calculating the rotational speed of a fan in a power battery pack for a hybrid electric vehicle. Background technique [0002] With the growth of population and economy, energy and environmental issues have prompted countries to develop new energy vehicles, energy-saving and environment-friendly vehicles. Hybrid electric vehicles are energy-saving and environmentally friendly, and have a broad market space and good development prospects. [0003] The battery pack, as the main energy storage device loaded with the battery pack on the hybrid electric vehicle, is a key component of the hybrid electric vehicle and directly affects the performance of the hybrid electric vehicle. Due to its excellent power output characteristics and long life, nickel-metal hydride power batteries are currently being used in battery packs for hybrid vehicles. Due t...

AI Technical Summary

Problems solved by technology

Due to the limited space on the vehicle, a large amount of heat generated by the battery during operation is affected by the space and accumulates, resulting in uneven temperature everywhere, which affects the consistency of the battery cells, reduces the battery charge and discharge cycle efficiency, and affects the power and energy of the battery. In severe cases, it will also lead to thermal runaway, affecting system safety and reliability

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