Performance analysis and parametric design of the dual-mode planetary gear hybrid powertrain

Abstract

The multimode electrically variable transmissions (EVTs) are an advancement of the conventional planetary gear hybrid powertrains (PGHPs). Using the analytical methodologies once applied to the single-mode PGHP, the dual-mode PGHP was investigated. The transmission efficiency and the system optimal operation point maximizing the system overall efficiency were analysed. With the system optimal operation points, the fuel economies of the dual-mode PGHP vehicle were calculated assuming constant-velocity cruising and NEDC mode driving. The top velocity and the acceleration performance were also estimated. To assign appropriate parameters for the new system, the design space and the optimization problem were defined using the vehicle performances from the analyses. An approach with various optimization techniques is proposed, and the optimal parametric design is obtained. The dual-mode PGHP showed improvements in efficiency and dynamic performances compared with the singlemode PGHP. In particular, the powertrain is expected to have advantages because it uses a smaller-sized motor/generator (MG) or two identical machines as two MGs.

Phase and thickness dependent modulus of Ge2Sb2Te5 films down to 25 nm thickness

“…where E, I, q, and A, are, respectively, the modulus, the second moment of area, density, and cross-sectional area. 8,9 The subscripts, Si,0, Si, and GST denote the silicon layer of a silicon-only cantilever, the silicon, and GST layer of a Si-GST composite cantilever, respectively. The frequency shift ratios of 0.3%-0.5% are captured for the 25 nm-thick GST films.…”

Comparative Analysis of Technical Route and Market Development for Light-Duty PHEV in China and the US

“…PHEV and hybrid electric vehicles (HEV) have basically the same powertrain system architectures. According to the coupling relationship between electrical and mechanical energy, the architectures can be divided into three basic types: Series, parallel and compound, which include various specific deformation structures, as mentioned above [2,[4][5][6]12,14,17,[24][25][26][27][28][29][30][31][32][33][34][35]37,[39][40][41][42][43][44][45][46]51,52]. In order to accurately describe the specific architecture forms, analyze the performance characteristics of the hybrid system, and accurately plan the products' processes for the enterprise, BorgWarner proposed a method based on motor position in the powertrain for representing their product planning, which is widely accepted by the industry and is commonly used to express the detailed architectures of hybrid powertrain systems.…”

Configuration Synthesis of Novel Series-Parallel Hybrid Transmission Systems with Eight-Bar Mechanisms

“…In 1996, General Motors developed a two-mode hybrid transmission including two PGTs and two electric motor/generators with two clutches and one brake [16][17][18], for running at both high speed and low speed. The clutches and brakes are engaged to control many flexible operation modes and improve vehicle performance and fuel economy [7].…”