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A real-time power distribution control method for vehicle hybrid power system

A hybrid power system, real-time power technology, applied to vehicle components, circuits or fluid pipelines, transportation and packaging, etc., can solve the problems that the battery SOC adjustment control cannot be guaranteed, and the battery state of charge cannot be measured.

Active Publication Date: 2018-04-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the case where the auxiliary energy is a battery power system, the current control method cannot guarantee a more accurate adjustment and control of the battery SOC due to the unmeasurable state of charge (SOC) of the battery.

Method used

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  • A real-time power distribution control method for vehicle hybrid power system
  • A real-time power distribution control method for vehicle hybrid power system
  • A real-time power distribution control method for vehicle hybrid power system

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Experimental program
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Effect test

Embodiment 1

[0057] Since the actual load equivalent resistance and auxiliary energy SOC are unmeasurable, the control effect of the present invention is verified by building a fuel cell-lithium battery hybrid power system simulation model in Matlab / Simulink.

[0058] From figure 2 It can be seen that the estimated load equivalent resistance provided by the present invention The actual load equivalent resistance of the sudden change can be smoothed, which is beneficial to obtain the design value of the main energy output current that meets the response speed constraint. In steady state, the estimated value of load equivalent resistance It approaches the actual load equivalent resistance, which shows the effectiveness of the proposed renewal law.

[0059] image 3 It is the control effect of the present invention on the auxiliary energy SOC. The setting value of auxiliary energy SOC is 0.6, according to the corresponding relationship between auxiliary energy SOC and auxiliary energy open circ...

Embodiment 2

[0061] The invention has also been applied and verified on actual fuel cell-lithium battery hybrid golf carts. Figure 4 The middle is the output current response curve of the fuel cell as the main energy source and the lithium battery as the auxiliary energy source. It can be seen that the response speed of the main energy current is relatively slow, which meets the upper limit of the response speed of the rate of change not higher than 10A / s. Auxiliary energy provides high frequency components in the energy demand of the load.

[0062] It can be seen from this embodiment that the method of the present invention does not need to accurately identify the model parameters of the system in actual on-board applications, and can perform relatively accurate adjustment and control of the unmeasured auxiliary energy SOC and reasonable power distribution to meet its power output The dynamic response limit reduces the difficulty of implementation and improves the robustness of the system. ...

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Abstract

The invention discloses a real-time power distribution control method for a vehicle-mounted hybrid power system. In order to get rid of the characteristic that a main energy system dynamic response is slow and deal with the actual dynamic working condition changed quickly and suddenly, key feature parameters of the hybrid power system are estimated on line through a self-adaption updating law, an online updating law of the virtual load current is established on the basis of key feature parameter estimated values, and real-time power distribution is conducted on an energy source. By the adoption of the method, online tracking of dynamic power requirements can be achieved, meanwhile, dynamic restraints of the system are fully considered, the safety of the hybrid power system can be better guaranteed, and the service life of the hybrid power system can be better prolonged.

Description

Technical field [0001] The invention belongs to the field of intelligent control of vehicles, and in particular relates to a real-time power distribution control method of a vehicle-mounted hybrid power system. Background technique [0002] With the advancement and development of science and technology, some emerging energy systems, such as fuel cell systems, battery power systems, and super capacitor systems, are becoming more and more widely used in new energy due to their high energy conversion rate and zero emission advantages. In the vehicle power system. In view of the specific advantages of different energy systems, in practical applications, two different energy systems are often used as the main energy and auxiliary energy systems to form a vehicle power system (such as fuel cell-battery hybrid power system, battery-supercapacitor hybrid power system) , Thereby improving the system's dynamic response performance to frequently abrupt load power demand and its energy conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R16/03
CPCB60R16/03
Inventor 陈剑武成帅徐陈锋
Owner ZHEJIANG UNIV
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