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It is very difficult to estimate the braking performance of a vehicle because brake system includes many parts such as a booster, a master cylinder, a valve and so forth. To calculate the braking characteristics such as braking force through the real vehicle test requires much time and cost. Therefore, the development of the way to estimate the braking performance of a vehicle with computational methods is needed. In this paper, a program which can analyze the whole braking capabilities of a vehicle is presented. Since all input and output data are composed of the Microsoft Excel format, it is easy to manage design data and found the data base. It is considered that the braking characteristics against the variation of booster vacuum pressure are changed when a vehicle is under braking. Furthermore, the additional postprocessor not only makes the graph presentation of the result data but also generates the Excel result files for the report.
In this paper, the optimization design module for the brake system of a vehicle is developed. As using this module, design variables, that minimize an object function and satisfy nonlinear constraint conditions, can be found easily. Before an optimization is operated, Plackett-Burman design, one of the factorial design methods, is used to choose the design variables which affect a response function significantly. Using the response surface analysis, second order recursive model function, which informs a relation between design variables and response function, is estimated. In order to verify the reliability of the model function, analysis of variances(ANOVA) table is used. The value of design variables which minimize the model function and satisfy the constraint conditions is predicted through Sequential Quadratic-Programming (SQP) method. As applying the above procedure to a real vehicle simulation model and comparing the values of object functions of a current and optimized system, the optimization results are verified.
Tire labeling measures the rolling resistance and wet road surface braking force of the tire product and grades them and displays them on the product, so that consumers can consider products with high energy efficiency and excellent performance. that measurements method considers only straightness, This is a measurement method that does not take into account changes in slip angle and camber angle when driving a vehicle. In order to derive the optimal measurement method, the change of slip angle and camber angle is measured through the wheel position measurement on the test car, The tires were mounted on a test device, and a rolling resistance measurement test was conducted using slip angle and camber angle. Propose a reasonable measurement method of combined fuel efficiency of tire by comparing the above items
The regulation for evaluating the durability of a tire is a driving test method which considers only a straight run, and has a problem in that it can not take into account the turnaround interval that occurs when the vehicle runs. In order to solve these problems, the "High Speed Tire Durability Evaluation Method" considering the traveling environment of the circuit is used to realize the characteristics of the tires when the vehicle is driven through the room test. We also compare tire performance and durability based on tire internal temperature, air pressure, and tread temperature data.
At the moment when interest in tire fuel economy grows naturally due to economic fluctuations, national regulations are being formed due to constraints due to limited use of limited fossil fuels and social attention to environmental problems. As a result, the tire energy consumption efficiency indicator system has been established. This system displays the two performance characteristics of the fuel economy and safety of the tire. The lower the rotational resistance of the tire, the better the fuel economy. The higher the wet road surface braking force, It is characterized by excellent. However, the current measurement of the rotational resistance of the tire efficiency rating system is based on only the straight running, and it is considered that the method is a method that does not take into consideration the rotation section traveling during actual vehicle driving. It is assumed that considering the feature that the slip angle camber angle change of the wheel / tire occurs through the turn driving when the actual vehicle travels, it is assumed that the correct fuel consumption is determined by the tire.