Automotive transmission efficiency measurement using a chassis dynamometer

Irimescu, Adrian; Mihon, Liviu; Padure, Gelu

doi:10.1007/s12239-011-0065-1

Cited by 41 publications

(14 citation statements)

References 10 publications

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“…The established relationships can then be used for direct or reverse engineering such as [22]. In order to connect automotive gearboxes as in case study [23], the results for the torque measurements of these structures [24] and [25], as well as torque based vehicle speed control [26], are used. This paper offers a new and specific approach based on the integration of axiomatic and robust methodology directed towards load capacity identification of the existing design structure or the design parameters definition in the design process of the new mechanical structure.…”

Section: Design For Reliability Based Methodology For Automotive Gearmentioning

confidence: 99%

Design for Reliability Based Methodology for Automotive Gearbox Load Capacity Identification

Ognjanović¹,

Milutinović²

2013

SV-JME

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The functional requirements of design structures, for example, the load capacity, reliability, service life, etc. are strongly related to operation conditions that are, as a rule, random and very often uncertain. The basic idea is to apply a set of methods in Engineering Design in order to develop a methodology for load capacity identification with regard to operation conditions. An automotive gearbox has been taken for the case study, because it represents a design structure with very variable operation conditions. The reliability of structures such as gearboxes is one of the main indicators of quality and an important functional requirement. In order to fulfil this objective, various methods and approaches are taken into consideration, such as Robust and Axiomatic Design, Property-based design, Design for X, and various studies in the fields of automotive gearboxes, gears and gear failures, the reliability of gear transmission components, etc.Today, Axiomatic design provides a basis for analytic presentation of the relationship between functional requirements and design parameters. The Axiomatic principles developed by Suh, continue to perfectly for various applications [1], but this methodology is also suitable for combining with the Robust Design approach. On the other hand, the Property-based design approach together with the system structure and functional requirements or quality indicators deduction provides possibilities for arranging specific procedures and approaches for the design parameters or the carrying capacity identification for design structures such as automotive gearboxes. Robust Design is a verified methodology, which provides good results on the first attempt. It also provides good design results (the relationship between functional requirements and design parameters) under variable operation conditions, and is applied for solving problems in many kinds of specific design cases. For horizontal axis wind turbines, the Robust design is carried out using the Taguchi method [2] and multi-objective optimization of the design parameters. The robustness of uncertain design variables can be provided by optimization using evolutionary algorithms [3]. The optimization is performed by analysing whether the solutions are truly robust and how robust optimal solutions differ from the performance maximizing solutions. Further perfection of robustness is provided for quality variables that vary over time [4]. Using the expectation of maximal quality loss over a time period, this work suggests the possibility of quantifying the robustness for timedependent quality characteristics. The reliability of technical systems such as automotive gearboxes is a typical time-dependent quality indicator that has to be treated in a similar way. In addition, the desired elementary reliability at the end of the service life of a design component can be applied as a design constraint for the design parameters definition [5] and [6].The reliability of technical systems has been studied for a long time, basically for the sake...

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Section: Design For Reliability Based Methodology For Automotive Gearmentioning

confidence: 99%

Design for Reliability Based Methodology for Automotive Gearbox Load Capacity Identification

Ognjanović¹,

Milutinović²

2013

SV-JME

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“…where h t (transmission efficiency) was calculated throughout the rpm range based on full load P e and P w measurements [29]. Full load, as well as part load measurements were performed for the entire engine speed range when fueling the engine with gasoline, 10% (IB10), 30% (IB30) and 50% (IB50) isobutanol blended with the fossil fuel on a volumetric basis.…”

Section: Experimental Setup and Testing Proceduresmentioning

confidence: 99%

Fuel conversion efficiency of a port injection engine fueled with gasoline–isobutanol blends

Irimescu

2011

Energy

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“…Irimescu et al 18 use a similar MAHA Roller dynamometer in order to determine the transmission efficiency. The objective of this paper is to estimate the RRC variation, at high speed, for different types of tyres, using a ‘MAHA roller dynamometer’ facility.…”

Section: Introductionmentioning

confidence: 99%

Method of estimating the rolling resistance coefficient of vehicle tyre using the roller dynamometer

Șoica

Budală

Vlad

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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The tendency in the past few years has been to introduce tyres with lower rolling resistance coefficients to the market. This paper presents a mathematical method for determining the rolling resistance coefficients variation depending on the speed. The method uses power balance which results from automobile dynamics while rolling on chassis dynamometer. The rolling resistance coefficients of tyres obtained through ‘drum test method’, for which the rolling resistance coefficients variation is known in terms of vehicle speed, are considered as reference values, while than rolling resistance coefficients of tyres obtained through ‘MAHA roller dynamometer’ using the recorded lost drag power in the roll-out phase on the stand are considered as tested values. The rolling resistance coefficients variation could be determined up to the maximum permissible speed of the tyre, for all wheels trained on the stand and not just for one tyre, as determined in laboratory conditions. The test conditions are similar to those in real road conditions, where the temperature of the environment and wheels cannot be controlled. The values obtained by the authors’ proposed method were compared with the values obtained by the ‘drum test method’. The main contribution of the proposed method is to estimate the rolling resistance coefficients without using a very expensive test facility.

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Automotive transmission efficiency measurement using a chassis dynamometer

Cited by 41 publications

References 10 publications

Design for Reliability Based Methodology for Automotive Gearbox Load Capacity Identification

Design for Reliability Based Methodology for Automotive Gearbox Load Capacity Identification

Fuel conversion efficiency of a port injection engine fueled with gasoline–isobutanol blends

Method of estimating the rolling resistance coefficient of vehicle tyre using the roller dynamometer

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