Study on the impact of AMESim-based bladder hydraulic accumulator parameters on the performance of heavy-duty vehicle hybrid power system

Amidst escalating global energy shortages and environmental pollution, hydraulic hybrid technology has become a pivotal focus in heavy-duty vehicle research. Its high-power density, rapid charge-discharge capabilities, and eco-friendliness make it a promising solution for sustainable transportation. This study investigates how key parameters of bladder hydraulic accumulators affect the performance of hydraulic hybrid systems in domestic cranes, with a focus on comparing the Front-mounted Parallel Hydraulic Hybrid Crane (FPHHC) and the Conventional Crane (CONC). Innovations include establishing a quantitative model linking accumulator parameters (pre-charge pressure, volume, operating pressure) under a fixed parallel configuration to system performance and integrating an adiabatic model with gas thermal characteristics into accumulator mathematical modeling to enhance energy storage calculation accuracy. Using LMS Imagine. Lab AMESim, a detailed system model was developed. Simulations and prototype experiments under standardized multi-cycle conditions show FPHHC outperforms CONC: system response times during energy charging and discharging average 0.354 s and 0.368 s respectively; hydraulic auxiliary braking deceleration reaches 0.25 m/s², 3.5 times that of CONC’s neutral coasting; acceleration time from 0 to 60 km/h is shortened by 11.74%; fuel consumption under multi-cycle conditions is reduced by 17.67%, with simulation results showing high consistency. This research provides a robust foundation for rational accumulator design in heavy-duty hybrid systems, advancing energy-efficient transportation technologies and supporting sustainable automotive development.