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Development of Variable-Valve-Gain Rotary Valve for Speed Proportional Power Steering System

Chassis Design Dept.Nissan Motor Co., Ltd.-K. Uchida, M. Miyoshi
Published 1989-09-01 by SAE International in United States
As the number of vehicles equipped with power steering systems increases, the need for speed proportional power steering systems has been increasing. They can provide light steering effort at low vehicle speed and high steering effort at high vehicle speed. Therefore, a speed proportional steering system is a better steering system for the driver.A newly developed rotary valve for speed proportional power steering systems changes its hydraulic valve gain characteristics. The operating principle is completely different than those of conventional flow and hydraulic reaction control systems.The rotary valve developed has 2 sets of orifices with different characteristics. They are arranged in series to achieve variable power assist by changing the bypass ratio between those orifices using a solenoid valve.This system offers an excellent degree of modulation between high speed mode (minimum power assistance) and parking mode (maximum power assistance). It is, moreover, simple, compact and economical.
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Development and Application of A New Internal Relief valve System for Oil Cooling Heat Exchangers

Hayden, Inc.-Eugene C. Boyer
Published 1989-09-01 by SAE International in United States
The report describes a unique patented internal pressure relief system that was developed to accommodate the changing flow and/or pressure conditions that are typical with oil cooling systems for motor vehicles and other applications. First, there is a description of the complex procedure that would be used to evaluate an oil cooler design along with the related problems that led to the design objectives for the new internal relief value. Then the design development procedure and component parts of the relief valve are described. The detailed review of the performance characteristics of the relief valve system includes graphs that illustrate the effects of the number of valves used and the valve pressure setting on the oil pressure drop and oil flow capability for a cooler tested with various oil viscosities. Finally, the internal relief valve system is reviewed for application advantages in oil or hydraulic cooling systems with varying flow rates, pressure surges, or varying ambient temperatures (oil viscosities).
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Development of the Partial Strengthening Method for Automobile Aluminum Alloy Castings by TIG Surface Remelting

Toyota Motor Corp.-Mototsugu Koyama, Joji Miyake, Kanji Sakaguchi
Published 1989-09-01 by SAE International in United States
A new partial strengthening method, TIG (Tungsten Inert Gas) remelting process, for automobile aluminum alloy castings is described. The preferable operating variables to strengthen, and metallurgical-mechanical properties of remelted alloys formed under selected conditions have been investigated. As a result, the mechanical properties such as strength and toughness, and thermal crack resistance of the remelted alloys were improved markedly due to the effects of microstructure refining and cast defects decrement by remelting. So, the application studies for automobile parts to meet the characteristics of this process have been carried out.Consequently, TIG remelting process has been practically used as an available strengthening method for the portion between valve ports of high performance diesel engine cylinder head.
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Engine Based Computational Fluid Dynamic Simulation using KIVA with a Transputer Based Concurrent Computer

Department of Mechanical Engineering Kyoto University Japan-M. Shioji
Department of Mechanical Engineering Lough borough University of Technology England-J. C. Dent, C. Wright
Published 1989-09-01 by SAE International in United States
Transputer based concurrent processing has been applied to an extensive engine based Camputational Fluid Dynamics Code - KIVA, and demonstrated to be effective in terms of accuracy and cost. Scope exists for further adaptation of the code to the hardware to enhance performance.The use of concurrent processing with Transputer hardware merits consideration as a powerful and inexpensive engineering computational aid.
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An Application of Structural-Acoustic Coupling Analysis to Boom Noise

Nissan Motor Co., Ltd.-Ichiro Yamazaki, Takeshi Inoue
Published 1989-09-01 by SAE International in United States
Reduction of interior noise is an important factor in vehicle design and many experimental and theoretical studies have been carried out to find effective noise reduction techniques. Previously, we developed a Structural-Acoustic Uncoupled Program, ACOUST3, as a technique for estimating low-frequency noise in the vehicle interior. In the present work, ACOUST3 has been extended to construct an acoustic coupling analysis system, ASCA, which is used to calculate low-frequency noise, such as boom noise. In order to calculate low-frequency noise accurately, it is necessary to represent the vibration characteristics of the trimmed body as closely as possible. To do this, we built a trimmed body model, incorporating 22 trim parts, based on vibration test results, and found that the calculated results obtained with the model correlated well with experimental data. This confirmed that the ASCA system can estimate low-frequency interior noise with good accuracy, making it a useful tool for reducing noise and vibration at the vehicle design and development stage.
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Synchronizer and Shift System Optimization for Improved Manual Transmission Shiftability

Nissan Motor Co., Ltd-Shigeo Murata, Yasuo Mori, Toshimasa Doi, Toshiaki Takada, Yukihiro Nogichi
Published 1989-09-01 by SAE International in United States
The R30A manual transmission mounted in the new Nissan 300ZX was developed to optimize shif-tability. Numerous performance improvements were made to achieve that goal, centering particularly on the development of a new double-cone synchronizer. Several new techniques were developed to evaluate shiftability quantitatively and supplemented conventional procedures, which are primarily based on subjective evaluation methods. As a result, the R30A transmission provides shiftability optimized for use in a high-performance sports car. This paper presents the methods used in evaluating shiftability and describes the features of the R30A that contribute to improved shiftability. It also presents the results of experiments carried out to confirm the improved performance.
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A Study on Electro-Hydraulic Control for Automatic Transmission

Industrial Electronics & Systems Development Lab. Mitsubishi Electric Corporation-Koji Hasunaka, Kiyoshi Takagi, Sinji Watanabe
Passenger Car Engineering Center Mitsubishi Motors Corporation-Takeo Hiramatsu, Kenjiro Fujita
Published 1989-09-01 by SAE International in United States
This paper refers to the results of a study on the usefulness of simulation techniques based on both modeling and experiments of electro-hydraulic systems using an on-off solenoid valve controlled by pulse width modulation for an automatic transmission.By this simulation, the pressure dynamics in a hydraulic circuit and the movement of a clutch piston were analyzed assuming the flow of the hydraulic circuit to be a one-dimensional compressible flow, and considering the non-linear spring characteristics of a clutch.As a result, in comparison with the experiments, the validity of this calculation has been confirmed.
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The Flat Cable Turning Over Phenomenon in The Roll Connector for The Air Bag

Auto Products Div. The Furukawa Electric Co.-Selichi Ueno, Masato Miyahara
Tokai Riki Co., Ltd.-Kazuhisa Kubota
Published 1989-09-01 by SAE International in United States
The roll connector for the air bag system contains a coiled flat cable like a clockspring to allow permanent electrical contact over the complete revolution range of the steering wheel.However such coiled construction has an serious problem that the flat cable happens to be turned over during operation. This problem is extremely vital, since it may make air bag circuits open.We discovered that the turning over phenomenon of the flat cable was happened by various different causes which could be classified into two groups; one is consisted of what caused obstructions to the flat cable movement and the other is consisted of what was caused by the normal movement of the flat cable itself. We have analized each of them, especially the latter causes, by intensive observation and theoretical calculation and found out counter measures which were put into practical designs.
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Design Tool for Climatic Control of an Automotive Vehicle

Industrial and System Engineering Dept., University of Michigan-Dearborn-Wen J. Wu
Mechanical Engineering Dept., University of Michigan-Dearborn-John G. Cherng
Published 1989-09-01 by SAE International in United States
The fundamental theory and techniques used in developing a design tool for climatic control of an automotive vehicle are presented. Methods for simulating automobile heating as well as air conditioning components and the vehicle passenger compartment are outlined. The program structure and simulation results are also included.
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Profiles of Automobiles in the Year 2000

Mitsubishi Motors Corp.-Sunao Chikamori, Arata Sumie, Yuzo Ohta
Published 1989-09-01 by SAE International in United States
There have been various predictions made concerning the future profile for automobiles but such predictions have in many cases been based solely on anticipated advances in technology. In presenting a profile for automobiles in the year 2000, the writers predict the evolution and transfiguration of automobiles, taking both phases in the changing social environment and technical trends into account. Interest in automobiles is expected to shift from hardware to software and then to humanware (i.e. more emphasis is placed on the relationship with human beings), and automobiles will evolve and transfigure reflecting these changes.
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