Planet type hybrid electric vehicle parking charging control method

Abstract

The invention provides a planet type hybrid electric vehicle parking charging control method. According to the planet type hybrid electric vehicle parking charging control method, the active control of a driver over the power battery charging power can be realized, meanwhile, a brake is controlled by a VCU control brake to ensure the safe parking when power generation is carried out, and a varietyof measures are adopted to avoid the possible safety problems caused by abnormal charging. The planet type hybrid electric vehicle parking charging control method comprises the steps that (1) parkingcharging condition judgment is carried out, specifically, whether parking charging conditions are met or not is judged according to a vehicle state and a driver input signal; (2) maximum allowable power generation power calculation is carried out, specifically, the maximum allowable power generation power of a system is calculated and obtained according to constraint factors of the dynamical system; (3) charging control is carried out, and the charging control comprises braking force control, power generation power analysis and control over an engine and motors; and (4) abnormal charging treatment is carried out, specifically, unusual conditions appear in the charging process are subjected to corresponding safe treatment.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicle control, in particular to a parking and charging control method for a planetary hybrid electric vehicle, and is especially suitable for a planetary hybrid commercial vehicle with a lithium battery as a power source and without a clutch. Background technique [0002] Compared with other types of hybrid configurations, the planetary hybrid system has the advantages of compact structure and convenient arrangement. The system can decouple the engine speed and torque from the road load, and it is easy to optimize the control of the engine. For commercial vehicles, since the planetary hybrid power system can realize the stepless speed regulation function of the engine, it can fully avoid the frequent changes of the engine operating point and the unreasonable distribution of the operating point during the acceleration and deceleration of the vehicle and the low-speed driving process. per...

AI Technical Summary

Problems solved by technology

Considering the safety of the parking brake, it is not possible to charge with high torque when charging in a parked state, which leads to high fuel consumption and long charging time

[0004] (2) The problem of stable output of power when climbing for a long time

However, the battery power may be exhausted when driving uphill for a long time, which will cause a decrease in power and cause safety hazards

Because the traditional VCU cannot predict the road conditions, it may not meet the climbing requirements due to the low SOC before climbing.

[0005] (3) The problem of sufficient recovery of braking energy when driving downhill for a long time

[0006] For the planetary hybrid system without clutch, the parking brake torque of the conventional power system is too small to meet the demand for high-power charging, and the VCU cannot predict the characteristics of future driving conditions. There is no effective solution to the above problems

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