Modeling and simulation of hydro-mechanical continuously variable transmission system based on Simscape

Abstract

The traditional methods of dynamic modeling for the simulation of hydro-mechanical continuously variable transmission (HMCVT) are cumbersome and complex. The physical simulation models of engine, hydraulic speed regulating mechanism, mechanical speed regulating mechanism and the load were established based on Simscape, and the dynamic characteristics of the components were analyzed in the paper. The simulation results show that with the change of displacement ratio e, the output speed of the system is continuous and stepless, and the output torque of the system is constant when the torque of load is constant. From the analysis results, it is concluded that the physical models are feasible. The research provides a theoretical foundation and a verification platform for further development and improvement of HMCVT shifting strategy.

Comparative fuel economy, cost and emissions analysis of a novel mild hybrid and conventional vehicles

“…Because the engine model only needs to output a desired torque and speed in response to a given throttle command, the -Generic Engine‖ component in the SimDriveline package offers sufficient functionality for our needs. This development strategy has been successfully used in the prior literature (41,42). Figure 6 shows the engine map and the maximum torque line of the engine.…”

“…This development strategy has been successfully used in the prior literature. 41,42 Figure 6 shows the engine map and the maximum torque line of the engine.…”

Comparative system dynamic modeling of a conventional and hybrid electric powertrain

“…The Simscape environment was used to establish the physical simulation models of the engine and its control. As the engine model only plays a role in providing torque output and speed for a given throttle command, the simple engine model "Generic Engine" in the SimDriveline package is chosen directly, as used in (Zhou et al, 2015, Mahapatra et al, 2008. The physical simulation models of the EPS (motor and control) were also established in the MathWorks' Simscape environment.…”

Method and Test Bench for Hydro-Mechanical Continuously Variable Transmission Based on Multi-Level Test and Verification

“…After the in-depth analysis of the transmission characteristics, the efficiency of the transmission system is finally optimized through the control system, and the fuel economy of the engine is improved [5][6][7][8]. Some scholars have carried out theoretical calculations and analysis on the design scheme and established a simulation model of the overall scheme for simulation analysis and verification [9][10][11]. Based on simulation analysis and verification, some scholars confirm the rationality and correctness of the simulation model by verifying the physical prototype through the test bench or comparing the installation verification with the simulation results [3,8,[12][13][14][15][16].…”