Control method of battery charge state SOC for hybrid electric vehicle

Abstract

The invention relates to a state-of-charge (SOC) control method of a hybrid electric vehicle; the SOC of the battery is divided into different sections; whether power generation / driving are allowed is controlled respectively for different working conditions in different sections; corresponding power generation / driving torque is calculated; the division of different SOC sections can better realize all functions of the hybrid electric vehicle in specific sections and under certain conditions; all power generation / driving functions are permitted in the A section; only regeneration braking is allowed in the B section, and an auxiliary driving to improve the engine efficiency is provided in the B section. The control method can well stable the battery SOC in the preset section, find more reasonable power generation and auxiliary driving chances during vehicle traveling, ensure the vehicle to provide auxiliary driving function stably, improve the performance of the vehicle and reduce the exhaustion.

Description

technical field [0001] The present invention relates to a multi-energy management system on a hybrid electric vehicle, and further relates to a control method for a battery state of charge (SOC), which is a control method for controlling the battery SOC within a certain specific range. Background technique [0002] A hybrid vehicle is essentially a multi-energy system. How to coordinate the work of various energy systems is a key issue in the development of a hybrid vehicle, which directly affects the performance and fuel economy of the vehicle. [0003] From the perspective of the battery, both overcharging (too high SOC) and overdischarging (too low SOC) will affect the life of the battery, which is determined by the characteristics of the battery. Therefore, it is necessary to control the SOC of the battery within a certain range. However, this is only the most basic consideration. [0004] For now, the capacity of batteries is very limited. If the energy of the batter...

AI Technical Summary

Problems solved by technology

If the energy of the battery is used too much, the battery is often in a state of too low SOC during the driving of the vehicle, so that in many cases it cannot provide functions such as auxiliary driving, which will make the user feel that the performance of the vehicle is extremely unstable and cause user complaints ; If the battery power is used too little, the battery is always in a state of too high SOC during driving. When braking and other situations, energy recovery can be carried out, but due to too high SOC, the recovered energy is very little, and the available The battery power is also less, which is not conducive to improving fuel economy

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