scholarly journals Study on the Control Strategy of Shifting Time Involving Multigroup Clutches

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Zhen Zhu ◽  
Xiang Gao ◽  
Daoyuan Pan ◽  
Yu Zhu ◽  
Leilei Cao
Keyword(s):  
Control Strategy ◽  
Simulation Analysis ◽  
Planetary Gear ◽  
Simulation Models ◽  
Operating Conditions ◽  
Dynamic Analyses ◽  
Variable Transmission ◽  
Gear Mechanism ◽  
Test Verification ◽  
Planetary Gear Mechanism

This paper focuses on the control strategy of shifting time involving multigroup clutches for a hydromechanical continuously variable transmission (HMCVT). The dynamic analyses of mathematical models are presented in this paper, and the simulation models are used to study the control strategy of HMCVT. Simulations are performed in SimulationXplatform to investigate the shifting time of clutches under different operating conditions. On this basis, simulation analysis and test verification of two typical conditions, which play the decisive roles for the shifting quality, are carried out. The results show that there are differences in the shifting time of the two typical conditions. In the shifting process from the negative transmission of hydromechanical ranges to the positive transmission of hydromechanical ranges, the control strategy based on the shifting time is switching the clutches of shifting mechanism firstly and then disengaging a group of clutches of planetary gear mechanism and engaging another group of the clutches of planetary gear mechanism lastly. In the shifting process from the hydraulic range to the hydromechanical range, the control strategy based on the shifting time is switching the clutches of hydraulic shifting mechanism and planetary gear mechanism at first and then engaging the clutch of shifting mechanism.

Precise and High Response Measuring Method of Meshing Force of Planetary Gear Mechanism

2012 ◽  
Vol 516 ◽  
pp. 469-474
Author(s):  
Yuta Morimoto ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Yasuhiro Uenishi
Keyword(s):  
Electric Vehicles ◽  
Automotive Industry ◽  
Differential Rotation ◽  
Planetary Gear ◽  
Measuring Method ◽  
Power Source ◽  
Hybrid Vehicles ◽  
Gear Noise ◽  
Gear Mechanism ◽  
Planetary Gear Mechanism

Recently, technology for electric vehicles (EV) and hybrid vehicles (HEV) has been focused on by the automotive industry to address environmental problems including CO2 reduction [. In particular, in HEV, planetary gears are used to control differential rotation of the motor, engine and generator. For these vehicles, the noise level inside the vehicle is low because the motor is used as the main power source. As a result, further decrease of gear noise is desired compared with the conventional planetary gear mechanism. However, research into the gear noise of the planetary gear mechanism is extremely scarce. Therefore, in this study, we focus on the three axes of I/O rotation, and a new method of measuring the meshing force of the planetary gear mechanism. In this report, a gear-driving device, which is able to make 3-axis differential rotation, was designed for experimentation.

S1120101 Research on durability of ultra-micro reduction gear using mechanical paradox planetary gear mechanism

2015 ◽  
Vol 2015 (0) ◽  
pp. _S1120101--_S1120101-
Author(s):  
Michimasa UCHIDATE ◽  
Kentaro SATO ◽  
Katsuya KOUNO ◽  
Yuuji OGAWA ◽  
Shigeko SASAKI ◽  
...  
Keyword(s):  
Planetary Gear ◽  
Reduction Gear ◽  
Gear Mechanism ◽  
Planetary Gear Mechanism

Research of Self-Locking in 2K-H type Planetary Gear Mechanism with External Gears

2000 ◽  
Vol 2000.2 (0) ◽  
pp. 433-434
Author(s):  
Kazuteru NAGAMURA ◽  
Tuneji YADA ◽  
Kiyotaka IKEJO ◽  
Kensei OOTA ◽  
Yoshiya KAGARI
Keyword(s):  
Planetary Gear ◽  
Gear Mechanism ◽  
Planetary Gear Mechanism

Modeling and Experimental Testing of the Hondamatic Inline Hydromechanical Transmission (iHMT)1

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
X. Hu ◽  
C. Jing ◽  
P. Y. Li
Keyword(s):  
Experimental Testing ◽  
Viscous Friction ◽  
Planetary Gear ◽  
Operating Conditions ◽  
Mechanical Transmission ◽  
Hydraulic Pump ◽  
Valve Mechanism ◽  
Variable Transmission ◽  
Overall Efficiency

Abstract A hydromechanical transmission (HMT) is a continuously variable transmission that transmits power both mechanically and hydraulically. A typical HMT consists of a pair of hydraulic pump/motors and a mechanical transmission in parallel, making it bulky and costly. The Hondamatic transmission is a compact alternative HMT design that uses an inline configuration such that the rotation of the piston barrels of the pump and motor is dual-used for mechanical transmission. This is achieved using a two-shafted pump that plays the role of a planetary gear (PG) and a distributor valve mechanism that replaces the valve plates. This paper provides the operating principle of this inline HMT (iHMT) and analyzes its performance through a combination of modeling and experimentation. Specifically, ideal and lossy average models are developed, and the performance of the Hondamatic is characterized experimentally. The lossy model, fitted with seven empirically determined parameters, is capable of predicting the mechanical and volumetric losses at different ratios and operating conditions. The dominant losses are found to be compressibility losses and no-load viscous friction losses, especially on the motor side. These losses are attributed to be the main causes for the unity transmission ratio to be less efficient than expected. The overall efficiency is between 74 and 86% at the conditions tested experimentally and is predicted to be over 70% under most operating conditions and transmission ratios. This analytical and experimental study is the first study in the open literature on this innovative compact inline HMT configuration.

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