Dynamic Coordinated Diesel-electric Competition Control Method for Parallel Mild Hybrid Tracked Vehicle

doi:10.12382/bgxb.2025.0395

Abstract

Abstract:

Focusing on the issue of diesel-electric competition and diesel engine’s insufficient power for parallel mild hybrid tracked vehicle in launch and acceleration process，the theoretical analysis and vehicle tests are conducted to find the corresponding reasons.Based on the test results，the variables of fuel mass demand and fuel mass constraint are used to describe the driver’s power demand and diesel engine’s output capability，furthermore the desired motor output in dynamic process is determined.Finally，a fuel demand differential-based motor torque algorithm is proposed，which emphasizes the dominant role of diesel engine as the power source in parallel mild hybrid tracked vehicle.A coordinated control method is proposed for the diesel-electric competition in the dynamic process of parallel mild hybrid tracked vehicle.An object powertrain model is established to validate the proposed method through simulation.The simulated results show that the proposed method succeeds in improving the dynamic performance of vehicle and avoiding the underlying diesel-electric competition problem.Compared with the existing method，the proposed method is used to improve the diesel engine dynamic output by 19.37%，reduce the battery power consumption by 63.75% and shorten the 0-32km/h acceleration time by 6.52%.

Key words: parallel mild hybrid tracked vehicle, diesel-electric competition, dynamic coordinated control, turbo lag, speed differential-based motor torque algorithm, fuel demand differential-based motor torque algorithm

WANG Shangyan, CUI Tao, WANG Tianxiang, WANG Bingbing, ZHANG Fujun. Dynamic Coordinated Diesel-electric Competition Control Method for Parallel Mild Hybrid Tracked Vehicle[J]. Acta Armamentarii, 2025, 46(S1): 250395-.

Figures/Tables 23

Fig.1 Schematic diagram of parallel mild hybrid powertrain for tracked vehicle

Fig.2 Simplified structural diagram of parallel mild hybrid powertrain for tracked vehicle

Fig.3 Schematic diagram of speed differential-based motor torque algorithm

Table 1 Key parameters of parallel mild hybrid tracked vehicle

主要参数	数值
整车质量/t	23
柴油机额定功率/kW	480
柴油机额定转速/（r·min^-1）	2500
ISG电机额定功率/kW	100
动力电池容量/（kW·h）	8
液力变矩器循环圆直径/mm	375
传动箱挡位数	6

Fig.4 Experimental results of vehicle launch and acceleration process

Fig.5 Speed-fuel regulation mechanism and corresponding parameters of diesel engine

Fig.6 Experimental results of speed and fuel parameters in vehicle launch and acceleration process

Fig.7 Design of dynamic coordinated control method for parallel mild hybrid tracked vehicle

Fig.8 Block diagram of fuel demand differential-based motor torque algorithm

Fig.9 Comparison between fuel demand differential-based motor torque algorithm and speed differential-based motor torque algorithm

Fig.10 GT-Suite model of turbocharged diesel engine

Fig.11 Comparison of simulated and experimental results of diesel engine’s external characteristics

Table 2 RMSE% statistics for key parameters of engine external characteristics

外特性参数	RMSE/%
功率	1.11
循环喷油量	1.37
进气压力	1.68

Fig.12 Full-range speed regulation characteristic

Fig.13 Comparison of simulated and experimental results of ISG motor driving test

Table 3 RMSE% statistics for key parameters of motor and battery

主要参数	RMSE/%
电机转矩	6.09
电池SOC	0.37

Fig.14 Comparison of simulated and experimental results of vehicle launch and acceleration process

Table 4 RMSE% statistics of parameters in vehicle launch and acceleration process

主要参数	RMSE/%
车速	5.08
发动机转速	2.93
循环喷油量	5.84
进气压力	4.53

Fig.15 Comparison of primary parameters of vehicle launch and acceleration process in simulation

Fig.16 Comparison of fuel parameters simulation results in vehicle launch and acceleration process

Fig.17 Comparison of SOC simulation results in vehicle launch and acceleration process

Table 5 Statistics of simulated fuel and electricity consumption results in vehicle launch and acceleration process

控制方法	柴油机燃油消耗量/kg	电能消耗量/ （kW·h）	等效燃油消耗量/kg	综合燃油消耗量/kg
需求差方法	0.185	0.087	0.028	0.213
转速差方法	0.140	0.24	0.077	0.217

Table 6 Simulated results of main performance index in vehicle launch and acceleration process

项目	柴油机相对负荷率/%	电能消耗量/ （kW·h）	综合燃油消耗量/kg	0~32km/h 加速时间/s
需求差方法	76.30	0.087	0.213	8.6
转速差方法	63.92	0.24	0.217	9.2
改进效果	升高 19.37%	减少 63.75%	减少 1.84%	减少 6.52%

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