Whole vehicle energy management method for internal combustion generating extend range type electric vehicle

Abstract

The invention discloses a whole vehicle energy management method for an internal combustion generating extend range type electric vehicle. The SOC level of a current electric vehicle storage battery is obtained according to voltage and charging and discharging current information of the two ends of the storage battery, a high SOC threshold and a low SOC threshold are set to determine the on-off state of a range extender, and excessive charging and discharging of the storage battery and frequent start and stop of the range extender are avoided. In a range extend mode, drive demanded power of the whole vehicle is obtained according to discharge voltage and current information of a drive motor and a controller of the drive motor, an economic travel line of an internal combustion engine of the range extender and the current SOC value of the storage battery serve as bases, the optimal operation condition of the range extender is reasonably determined, charging and discharging demands of the storage battery are taken into consideration, accordingly whole vehicle dynamic performance and fuel economical efficiency are guaranteed, and meanwhile the energy storage level of the storage battery is optimized.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and relates to a vehicle energy management method for an extended-range electric vehicle, in particular to a vehicle energy management method based on electric vehicle battery SOC value and demand power prediction, internal combustion power generation system efficiency optimization, and battery energy storage optimization Management method. Background technique [0002] Energy shortages and environmental pollution problems have prompted the use of new energy electric vehicles to become more and more common. Electric vehicles have many advantages such as energy saving, environmental protection, comfort and convenience, but due to the limitation of battery technology level, there are still problems such as long charging time and short cruising range. By installing a range extender on the pure electric vehicle, the extended-range electric vehicle can effectively solve the problem of the cruising ra...

AI Technical Summary

Problems solved by technology

The former always fixes the internal combustion engine of the range extender at the most efficient operating point when the battery is running low. Although the fuel economy is good, the battery has the risk of overcharging and overdischarging; the latter considers the state of the battery and makes the internal combustion engine of the range extender Follow the load power changes, but the corresponding fuel economy and emissions are not easy to control

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