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Viewing 1 to 30 of 91
2015-04-14
Technical Paper
2015-01-0495
Shohei Mikami, Georgi Chakmakov
Designing a lightweight and high-strength engine product is universally important from the standpoints of fuel consumption, power, and cost; however, it is difficult to find an optimal solution accomplishing these characteristics in products such as the cylinder heads that are simultaneously affected by a thermal load and various mechanical loads. We focused on an optimization means called “nonparametric optimization” and created a method of cylinder head design that utilized it. Our optimization process was divided into topological optimization and shape optimization. In the topological optimization process, we searched for a structure with the highest theoretical stiffness in the given design space. This provided an efficient structure when pursuing both lightweight and high-strength characteristics in the subsequent shape optimization process. Strain energy and displacement of the combustion chamber were used as the parameters for controlling stiffness.
2015-04-14
Technical Paper
2015-01-0733
Nichole Verwys, Fritcher Fritcher, Thomas DeMass
Dark, high gloss decorative finishes (i.e. piano black) are gaining increased applications and demands in vehicle interiors; due to interior stylists desire for this look . One significant concern with this trend is that scratches and other appearance-related defects such as orange peel (waviness) are more apparent to the customer. To address this issue, a highly scratch-resistant 2K clearcoat formulation was developed to minimize visible surface scratches, while also yielding minimal orange peel and exceptional DOI (distinctness of image); all while being applied using typical application techniques in the part finishing market. This output was accomplished by first bench-marking the consumer electronics market for appearance and scratch resistance, and then setting targets through that research.
2015-04-14
Technical Paper
2015-01-1575
Tomokazu Honda
Automobile manufacturers have recently been carrying out research and practical application of torque vectoring systems that enhance vehicle maneuverability using direct yaw moment control by differential distribution of torque to the right and left wheels. Honda has also put an Active Torque Transfer System (ATTS) in the 1997 model Prelude as a torque vectoring system for FF vehicles. Subsequently, Honda also put the Super Handling All Wheel Drive (SH-AWD) into practical application as a system for AWD vehicles in 2004, installing it in the Legend. The SH-AWD is a four-wheel flexible control system that simultaneously controls torque distribution to front and rear wheels as well as to left and right wheels. Similarly, other manufacturers have also devised, and put into practical application, various types of electronically controlled AWD systems with torque vectoring mechanisms. These are developing into devices for enhancing vehicle maneuverability.
2015-04-14
Technical Paper
2015-01-1103
Taiki Ando
We studied the reduction of pulley thrust and the deviation of the winding trajectory of the pushing V-belt on the pulleys to reduce friction loss due to slipping in metal pushing V-belt. Pulley thrust control, the amount of friction transmitted between the pulleys and the metal pushing V-belt, and a configuration that controls pulley inclination were three focal points in reducing transmission loss. The effects of the three methods of increasing transmission efficiency in OD ratio during cruising studied in this project were verified in tests. The new pulley thrust control employed reduced pulley thrust by approximately 40% and increased transmission efficiency by 2.6%. The trajectory of the pushing V-belt when it winds around the pulleys deviates from the theoretical winding radius due to the inclination of the pulley v-surfaces.
2015-04-14
Technical Paper
2015-01-1009
Cameron W. Tanner, Kenneth Twiggs, Tinghong Tao, David Bronfenbrenner, Yoshiaki Matsuzono, Shinichiro Otsuka, Yukio Suehiro, Hiroshi Koyama
The EPA Tier 3 standard set in 2014 calls for a 65% reduction in combined NOx and NMOG pollutants from 86 to 30 mg/mile between 2017 and 2025 to improve air quality. In 2012, the EPA set a target to double fleet average fuel economy by 2025 as compared to 2010. The European Union has enacted and is in the process of phasing in regulations with similar objectives. For gasoline-powered cars and trucks, approximately 75% of emissions over a standard regulatory test like FTP-75 are released in the first 40 s after cold-start. Reductions in cold-start emissions will be part of the strategy to meet these challenging new regulations. The techniques that are proven to speed catalyst light-off to lower cold-start emissions are to move the converter upstream (close-coupling), to reduce the heat capacity of the converter, and to utilize catalysts that are active at low temperatures.
2015-04-14
Technical Paper
2015-01-1378
Takeshi Sasaki, Tatsuya Ohmaru, Taisuke Goto
We developed a windshield washer system that enhances washing performance while reducing the amount of washer fluid consumed. This system reduces the time required to remove dirt and reduces stress on users. To enhance washing efficiency, we studied how the windshield wiper and washer remove dirt. The washer fluid contacts and floats the dirt from the glass surface then wipes it away with the wiper blade. The amount of windshield washer fluid required and the time after the windshield washer fluid floats the dirt from the windshield and wipes it away were analyzed. When mounting the system in a vehicle, the required amount of windshield washer fluid and the required time were correlated to the washer fluid spray and control. The washer spray format, the target amount of washer fluid that contacts the glass surface and the target wiping timing can be achieved by locating the windshield washer nozzle near the center of the wiper blade.
2015-04-14
Technical Paper
2015-01-1321
Shigetaka Kameyama
Body development efficiency should be improved to reduce rework; designing a sufficiently stiff body model from the beginning becomes the key. A body designer studies the space available, which is judged by styling, design, and packaging; based on experience. The first model seldom reaches the targets of body stiffness, so improvements are required. We want to make a sufficiently stiff body model by building a simple and easy-to-use analysis method to help the designers’ understanding. In early stages of body development, there are more opportunities to study and propose design space for a stiff body structure. Because of the design flexibility at early stages, the information is easy to change, but there is little information to know how much space is available. Requirements analysis should be minimized. Designers should obtain the appropriate targets for each body part because each part has a different designer.
2015-04-14
Technical Paper
2015-01-1567
Scott Bradley Zagorski, Tomoya Ushimura, James Post
Many vehicle dynamics handling simulations have utilized a constant speed two degree-of-freedom bicycle model. To add greater fidelity, a third (roll) degree-of-freedom has been included. The input to this model is typically road wheel angle. However, in an actual vehicle, the driver’s input is handwheel angle. Usually, to relate the two a simple kinematic relationship, on-center steering ratio, is used; however, the system dynamics of the steering system have considerable influence on overall vehicle response. By considering the chassis and steering system at an early stage of development then the interaction of the two can be characterized. Power steering system models are typically hydraulic-based power steering (HPS); however, contemporary power steering systems are predominantly electric-based (EPS). This research develops an EPS model which includes a three degree-of-freedom (DOF) steering model coupled with a three degree-of-freedom vehicle model and EPS maps.
2015-04-14
Technical Paper
2015-01-0880
Masanobu Takazawa, Kiminori Komura, Toru Kitamura
Homogeneous charge compression ignition (HCCI) uses lean burn, achieving high thermal efficiency and low NOx. Gasoline HCCI has lower combustion robustness to in-cylinder temperature, causing issues with combustion. We used a four-stroke naturally-aspirated (NA) engine with direct injection and valve assembly with variable valve timing and lift electric control (VTEC). We switched control between stoichiometric spark ignition (SI) and HCCI combustion, and analyzed engine speed changes of load and the suitability of HCCI combustion. With HCCI, internal EGR maintained the in-cylinder temperature at the fuel's auto-ignition temperature. The internal EGR was contained by early closing of exhaust valve timing. Internal EGR varied with the HCCI operating conditions. Continuous exhaust valve timing changes were made by variable timing control (VTC). With that much EGR, there was too much for stoichiometric SI combustion. Discontinuous valve timing changes by VTEC were used combustion.
2015-04-14
Technical Paper
2015-01-1522
Takahiro Yokoyama, Koji Hiratsuka, Shinya Notomi
Users drive at relatively high speeds during the winter season, and maneuvering on snow-covered roads is a key performance for drivers. Demands are increasing for tires with lower rolling resistance. Tire patterns were developed similar to summer tires with reduced grooving and tire patterns with shallower grooves. This required techniques that predict maneuverability on snow-covered roads. This study treated maneuverability on snow-covered roads as maneuverability in the grip region, and verified the correlation between subjective evaluation using vehicles and tire stand-alone characteristics. Indexes were clarified for the tire contact patch and the physical properties of the tread rubber, which are prerequisites for securing grip in the normal-use. Typical index values for indexes were investigated using the surface pressure distribution obtained by a tire contact and surface pressure measuring system.
2015-04-14
Technical Paper
2015-01-1122
Kengo Yabe, Toru Inagaki, Takashi Kondo
Seat vibration when the vehicle is idling and when it is in motion has been reduced by using a floating seat that controls the resonance frequencies. The resonance frequency is controlled by replacing the structures of the seat-mounting unit with floating structures using rubber bushings. Partly replacing the mounting unit with floating structures makes it possible to control the resonance frequencies of the entire seat. The issue of balancing vibration reduction with strength and durability and crash safety performance due to fitting rubber bushings to the seat-mounting unit was addressed using stopper structures optimized for each type of input. To adopt a floating seat into an actual vehicle, the floating structure and conventional foot bracket are combined. This combined foot bracket not only makes it easy to assemble floating structure into the seat, but also makes it possible to keep the seat weight almost the same as a conventional seat.
2015-01-27
Article
The system can anticipate, by up to five seconds, the likelihood of a vehicle ahead "cutting-in" and endangering another.
2014-12-11
Article
Are smaller pickup trucks about to make a big comeback? In this week's SAE Eye on Engineering, Senior Editor Lindsay Brooke examines the current midsize pickup market, and looks at what's still to come. 
2014-12-03
Article
At the recent 2014 L.A. Auto Show, various OEMs put their latest hydrogen fuel-cell electric vehicles on stage. Engineers developing FCEVs are working against overlapping regulatory clocks, and OEM collaborations are taking the some of the sting out of development time and costs.
2014-12-01
Article
Design and manufacturing challenges are becoming more complex and multi-dimensional, prompting design teams to expand their efforts to collaborate. This change is being aided by a shift to 3-D models, but that transition has issues that highlight the complexity of linking various groups.
2014-11-12
Article
When a pedestrian appears on the road ahead of your car, it's a potentially dangerous situation. In this episode of SAE Eye on Engineering, Senior Editor Lindsay Brooke looks at Honda's new driver-assist feature called "Honda Sensing."
2014-08-12
Article
Replacing the TSX and TL models, the all-new 2015 TLX is positioned at the heart of the Acura sedan lineup, boasting two advanced new powertrains, including a “world’s first” eight-speed DCT with torque converter, and next-generation handling technologies.
2014-08-06
Article
Torque multiplication in the smooth operating, torque converter-equipped DCT makes the 2015 Acura TLX quicker off the line than the previous TSX.
2014-07-30
Article
The Electric Power Research Institute has announced a collaboration with 8 automakers and 15 utilities to develop and demonstrate an open grid integration platform for plug-in electric vehicles (PEVs).
2014-04-23
Article
Chevrolet Trax and Honda HR-V, based on the Sonic and Fit, will use the same engines as the cars, offer all-wheel drive, slot in below Chevy Equinox and Honda CR-V.
2014-04-17
Article
The GXR120 general-purpose engine from Honda was designed as a source of power for rammers.
2014-04-16
Article
Fuel economy with a CVT hits 41 mpg highway, while its new engine has double overhead cams, direct injection, and variable lift and cam phasing. Car continues with packaging innovation, gets 4.8 in (122 mm) more rear legroom.
2014-04-14
Article
The passenger-vehicle and commercial-vehicle industries are working to meet government regulations for emissions and fuel economy while ironing out potential unintended issues.
2014-04-14
Article
Problem solving is about to get a lot more complex as the global automotive industry moves to make the connected vehicle as commonplace as portable digital devices.
2014-04-09
Article
Leveraging the talent in Northern California forms a critical link for design teams striving to meet fuel and emission regulations while also bringing many new features and functions to vehicles.
2014-04-01
Article
IMSA Tudor United SportsCar Championship promotes a variety of green technologies to link racing to the road.
2014-04-01
Journal Article
2014-01-0063
Yutaka Horiuchi, Takashi Yanagi
Honda has developed an “Independent Left and Right Rear Toe Control System” that can achieve stable cornering performance and agile handling. We believe the issue that should be resolved in the next generation of ESC is the expansion of stability and agility into the general operation area. We examined how to accomplish this aim, and control of the independent rear toe angle was decided to be an appropriate method. In addition, a method for mounting the system without using a dedicated suspension was proposed. If left and right toe angles can be controlled independently, toe angle control and normal 4WS control become possible at the same time. In this paper, we will discuss the fundamental principle of independent toe angle control and the system configuration. Also, “INOMAMA Handling” (at driver's will) achieved by this system, as well as the fun and safe driving that are achieved as a result will be shown.
2014-02-26
Article
In 2013, more than 90% of Honda and Acura automobiles sold in the U.S. were made in North America. With the recent start of production at a new plant in Celaya, Guanajauto, Mexico (about 250 km northwest of Mexico City), that percentage is expected to grow to more than 95%.
2013-12-19
Article
The new Fit is equipped with new powertrains, including hybrid, EV, and sporty RS versions. Its new B platform also provides the basis for Honda's 2015 compact crossover.
2013-12-18
Article
The 2014 Accord Hybrid employs Honda’s cleverly designed i-MMD two-motor hybrid system that debuted on the Accord Plug-in Hybrid sedan. Honda's chief engineer provides insight.
Viewing 1 to 30 of 91

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