Control method of fuel cell hybrid electric vehicle system

Abstract

The invention discloses a control method of a fuel cell hybrid electric vehicle system and belongs to the field of B60W or B60K classification. The fuel cell hybrid electric vehicle system comprises a fuel cell pack, a single-stage boost inverter, a storage battery pack and an electric motor. According to the control method, an upper computer communication module gives out a power instruction according to the different operating situations of a hybrid electric vehicle, and a system control module calculates the power required by fuel cells according to the matching degrees of the fuel cells, storage batteries and alternating current side output power at the previous moment, sends a fuel cell power control signal and direct-connection duty ratio to a fuel cell control module and a motor driving module respectively and controls required input-output powers respectively. A storage battery charge capacity detecting module detects the charge capacity and other information of the storage batteries, and the system control module decides to charge the storage batteries or not through calculation and controls charge and discharge of the storage batteries according to the fuel cell power control signals and the direct-connection duty ratios. By means of the control method of the whole system, the system cost is reduced, and the system reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy hybrid electric vehicles, relates to a control method for fuel cell hybrid electric vehicles, and belongs to the classification field of B60W or B60K on the international classification table. Background technique [0002] Fuel cells are used for vehicle driving, which provides an effective solution to energy problems and environmental pollution problems. Pure fuel cell vehicles have only one power source, the fuel cell, and all the power loads of the vehicle are provided by the fuel cell. The disadvantages are (1) high power and high cost; (3) Braking energy recovery cannot be performed. The characteristics of the fuel cell determine that it is best to operate in a constant power region to prolong its service life and improve efficiency. However, the power of the driving motor changes, so in order to balance the two parts of power and absorb the braking feedback energy, the current fuel cell ...

AI Technical Summary

Problems solved by technology

[0004] The conventional voltage source inverter has the following disadvantages: it belongs to the step-down conversion circuit, and for DC / AC power conversion occasions with low DC voltage and high AC output voltage, an additional DC / DC step-up conversion is required The upper and lower devices of each bridge arm cannot be turned on at the same time, and the through problem caused by false triggering caused by electromagnetic interference is the main killer of the reliability of the converter

Such methods increase the cost and control complexity of the system, reduce the conversion efficiency, and do not solve the problems existing in the conventional voltage source inverter mentioned above

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