Power-following type fuel cell whole vehicle energy management and control method

Abstract

The invention discloses a power-following type fuel cell whole vehicle energy management and control method, and belongs to the technical field of fuel cell hybrid electrical automobiles. The power-following type fuel cell whole vehicle energy management and control method aims to solve the problem that in the case of an existing fuel cell whole vehicle energy management and control method, a power cell and a fuel cell can not be controlled to work within an optimal efficiency interval according to a power cell SOC and the power requirement of a driver, so that the service life and economicalefficiency of each cell are influenced. According to the power-following type fuel cell whole vehicle energy management and control method, the characteristics of the fuel cell and the power cell arefully utilized, the actual output power of the fuel cell is correspondingly controlled according to the whole vehicle power demand and the power cell real-time charge state so as to guarantee that both the fuel cell and power cell to work in the optimal interval, filtering and slope limiting are performed on the power of the fuel cell in different charge state intervals of the power cell, so thatin the whole working condition, multi-charge or multi-discharge of the power cell is guaranteed, the large-amplitude-value frequent fluctuation of the output power of the fuel cell is avoided, and thedurability of the fuel cell is also improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cell hybrid vehicles, and relates to a method for coordinating and distributing energy of a fuel cell and a power battery, in particular to a power-following type fuel cell vehicle energy management control method. Background technique [0002] Today, with the increasing shortage of oil resources and stricter environmental protection regulations, all countries are vigorously developing new energy vehicles. As a clean energy source with zero emissions in the true sense of the application, hydrogen fuel cells have their unique advantages. Fuel cell vehicles can not only completely replace gasoline in terms of fuel, but also have the advantages of high energy conversion efficiency, short hydrogenation time, and long cruising range. [0003] The energy management control strategy of fuel cell hybrid electric vehicle is the key technology of fuel cell control system. The energy sources of fuel cell vehic...

AI Technical Summary

Problems solved by technology

[0008] For the control methods disclosed in the above-mentioned patent documents, none of the setting principles for setting and clarifying the relevant limit value of the power battery SOC and dynamically adaptively adjusting the SOC target value according to the real-time state of the vehicle cannot control the power battery within the optimal efficiency range. charge and discharge; in addition, smooth processing of the power request signal of the fuel cell is not considered, and the fuel cell's frequent load and large-scale fluctuations will reduce its durability and output efficiency

In addition, none of the limp mode is set. When the hydrogen gas of the fuel cell is insufficient or fails, the vehicle will not be able to drive, reducing the reliability of the system.

In the control method of Patent Document 1, only the DCDC optimal power at the map point for each SOC and the required power of the vehicle is considered, and SOC balance is not considered, which will lead to overcharging or overdischarging of the power battery; the control method of Patent Document 2 In the method, the fuel cell will start and stop frequently with the increase and decrease of power battery power, reducing durability; in the control method of patent document 3, only several vehicle modes are announced, and the specific implementation control algorithm is not explained, which is not conducive to practical application

Images