The Effects of Water on Cellulose-Based Frictional Surfaces in Automatic Transmission Clutch Plates

Automatic Transmission (AT) system is efficient in the aspects of vehicle safety, comfort, reliability and driving performance. The objectives of this paper are to collect the oil samples from AT systems of engine bus according to manufacturer's recommendations and analyse collected oil samples using oil analysis technique. The sample transmission fluid which was taken from the AT gearbox has been experimentally analyzed. The oil samples were taken with an interval of 5,000km, 30,000km, 50,000km, 80,000km, 180,000km and 300,000km for AT bus operation. These samples then have been analyzed by comparing between new and used transmission fluid using Fourier Transform Infrared (FTIR) spectroscopy. Oil analysis by FTIR is a form of Predictive Maintenance (PdM) to avoid major failure in machine elements. Most machine elements are not easily accessible in the transmission system. Having a reliable technique would avoid the needs to open the components unnecessarily, hence, help to prevent catastrophic failure which are very costly, and ease of regular monitoring. In order to identify the major failures of automatic gearbox, forecasts can be made regarding the lube transmission fluid analysis test. By using this test, the minor problems can be determined before they become major failures. At the end of this research, the wear particles profile for interval mileage of AT system was obtained. Keywords: Wear, Automatic Transmission (AT), Transmission fluid, Fourier Transform Infrared (FTIR), Oil analysis.

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Characteristic Analysis of AMT Automatic Transmission

Study on Dynamical System ◽

10.35534/sds.0202006c ◽

2020 ◽

Vol 2 (2) ◽

pp. 39-42

Author(s):

Xu Yaqing

Keyword(s):

Automatic Transmission ◽

Characteristic Analysis

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Objective Rating of the Launch Behavior of Conventional, Hybrid and Electric Vehicles

Automotive Innovation ◽

10.1007/s42154-020-00131-z ◽

2021 ◽

Author(s):

Christian Dorsch ◽

Xiao Wang ◽

Ferit Küçükay

Keyword(s):

Electric Vehicle ◽

Electric Vehicles ◽

Hybrid Electric Vehicle ◽

Automatic Transmission ◽

Major Influence ◽

Important Process ◽

Dual Clutch Transmission ◽

Conventional Vehicle ◽

Objective Rating ◽

Dynamic Quality

AbstractThe calibration of conventional, hybrid and electric drivetrains is an important process during the development phase of any vehicle. Therefore, to optimize the comfort and dynamic behavior (known as driveability), many test drives are performed by experienced drivers during different driving maneuvers, e.g., launch, re-launch or gear shift. However, the process can be kept more consistent and independent of human-based deviations by using objective ratings. This study first introduces an objective rating system developed for the launch behavior of conventional vehicles with automatic transmission, dual-clutch transmission, and alternative drivetrains. Then, the launch behavior, namely comfort and dynamic quality, is compared between two conventional vehicles, a plug-in hybrid electric vehicle and a battery electric vehicle. Results show the benefits of pure electric drivetrains due to the lack of launch and shifting elements, as well as the usage of a highly dynamic electric motor. While the plug-in hybrid achieves a 10% higher overall rating compared to the baseline conventional vehicle, the pure electric vehicle even achieves a 21% higher overall rating. The results also highlight the optimization potential of battery electric vehicles regarding their comfort and dynamic characteristics. The transitions and the gradient of the acceleration build-up have a major influence on the launch quality.

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Recent progress in battery electric vehicle noise, vibration, and harshness

Science Progress ◽

10.1177/00368504211005224 ◽

2021 ◽

Vol 104 (1) ◽

pp. 003685042110052

Author(s):

Xia Hua ◽

Alan Thomas ◽

Kurt Shultis

Keyword(s):

Electric Vehicle ◽

Recent Progress ◽

Combustion Engine ◽

Automatic Transmission ◽

Battery Electric Vehicle ◽

Vehicle Noise ◽

Conventional Vehicle ◽

Transfer Case ◽

Air Intake ◽

Noise Vibration

As battery electric vehicle (BEV) market share grows so must our understanding of the noise, vibration, and harshness (NVH) phenomenon found inside the BEVs which makes this technological revolution possible. Similar to the conventional vehicle having encountered numerous NVH issues until today, BEV has to face many new and tough NVH issues. For example, conventional vehicles are powered by the internal combustion engine (ICE) which is the dominant noise source. The noises from other sources were generally masked by the combustion engine, thus the research focus was on the reduction of combustion engine while less attention was paid to noises from other sources. A BEV does not have ICE, automatic transmission, transfer case, fuel tank, air intake, or exhaust systems. In their place, there is more than enough space to accommodate the electric drive unit and battery pack. BEV is quieter without a combustion engine, however, the research on vehicle NVH is even more significant since the elimination of the combustion engine would expose many noise behaviors of BEV that were previously ignored but would now seem clearly audible and annoying. Researches have recently been conducted on the NVH of BEV mainly emphasis on the reduction of noise induced by powertrain, tire, wind and ancillary system and the improvement of sound quality. This review paper will focus on recent progress in BEV NVH research to advance the BEV systems in the future. It is a review for theoretical, computational, and experimental work conducted by both academia and industry in the past few years.

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