Your Selections

Honda Motor Co., Ltd.
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

The Design of Safe-Reliable-Optimal Performance for Automated Driving Systems on Multiple Lanes with Merging Features

Honda Motor Co., Ltd.-Kaijiang Yu
  • Technical Paper
  • 2020-01-0122
To be published on 2020-04-14 by SAE International in United States
Safety function for automated driving systems including advanced driver assistance systems and autonomous vehicle systems is very important. Inside safety function, predictive judge sub-function should be designed with the consideration of more and more penetration of automated driving vehicles. This paper presents the design on multiple lanes with merging features based on the author's previous Patent JP2019-147944 using predictive time-head-way and time-to-collision maps. In the author's previous work (Model Predictive Control for Hybrid Electric Vehicle Platooning Using Slope Information-Published on IEEE Transactions on Intelligent Transportation Systems), a model predictive control framework was designed. Due to the difficulty to detail the sub-safety function deeply with merging features, few works are found to deal with sensor platforms focusing on rear side, and situations of merging lane side with the consideration of relative relation variations with other vehicles and road border markers. However, performance enhancement is needed assuring 100% safety-reliability-optimality and single-objectivity. Also, platforms of on-board sensors including side and rear view are needed to deal with false negative operations and false positive operations. The optimal operation line…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Tumble Flow Enhancement Applied for Low-Load Condition of Engines by Utilizing Reverse Flow Phenomenon in Intake Port

Honda Motor Co., Ltd.-Yohei Nakamura, Yosuke Inoue, Makoto Fujikubo
  • Technical Paper
  • 2019-32-0509
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
We established a technology that can enhance the tumble flow in the cylinder only in a partial load range of the engine without the need to use any intake path switching mechanisms.Firstly, we attempted to understand the basic phenomena of intake flow by using a CFD model, while using a butterfly throttle valve in a straight pipe. By doing this, we were able to observe the reverse flow of intake air that appears after the intake air has passed the throttle valve when the throttle valve opening is 30% or less. This reverse flow is generated mainly in the flow that has passed the trailing edge of the throttle valve. At both sides of the trailing edge opening, the flow is slowed down by diffusing. The flow is then pulled into the low-pressure zone created behind the throttle valve. In addition, a part of the reverse flow merges with the air flowing on the leading-edge side.Next, we confirmed that installing a flow separator behind the throttle valve that vertically divides the flow can successfully capture…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of High Productivity and Low Cost Card-Edge Type ECU for Motorcycles

Honda Motor Co., Ltd.-Yuichi TAKEDA, Daisuke SUGIO, Koji INOSE
Keihin Corporation-Syuichi TAKIOKA
  • Technical Paper
  • 2019-32-0516
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
To reduce global warming, Honda has been worked on emission reduction and fuel efficiency enhancement by applying fuel injection systems. The productivity enhancement and cost reduction are strongly demanded in developing countries as the market is expanding. To enhance productivity and reduce cost of ECU, application of the semiconductor production method has been started for printed circuits with edge connectors. However, products that fully meet the requirements of us have not been realized so far. The ECU developed this time has a structure shielding the whole PCB package except the edge connector terminals. Thus, the waterproofness required for an ECU has realized, as a standalone component, as the first in the world (by Honda survey). To achieve that, we developed transfer molding dies equipped with a unique mechanism never been applied. Moreover, we developed an epoxy resin that eliminates the after cure process. Thus, productivity of 5 times over conventional was realized with a multi-cavity molding capable of moldings more than 10 pieces at a time. Furthermore, a new waterproof card-edge connector was developed, in…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of Laser Welding Pressed-frame for Small Scooters Considering High Production Efficiency

Honda Motor Co., Ltd.-Sunao Kawano, Takeru Kobayashi
  • Technical Paper
  • 2019-32-0544
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
The laser-welded pressed-steel frame made of the high-tensile-strength steel sheet and suitable for high efficiency production has been developed for small scooters. In majority of the conventional designs, the frame of small scooters is composed of a large number of steel pipes and stamped parts complexly welded together, requiring a number of welded joints. As a result, since the welding length increase and the dimensional error of the frame body after welding tends to be large, a correction operation in a post process is required. This has been one of the factors preventing further enhancement of production efficiency. In an attempt to cope with this issue, we have chosen to apply the pressed-steel frame construction using the high-tensile-strength steel sheet, which has been applied to small motorcycles, to small scooters. In addition, we replaced the spot welding with more efficient laser welding to further enhance productivity. The optimum cross section design taking advantages of the pressed-steel frame construction permits more gradual changes of cross sectional area than the conventional steel pipe frame, allowing dispersing of…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Prediction of Air Temperature Distribution around Rider on Idling Motorcycle by CFD Using DES Model

Honda Motor Co., Ltd.-Yuzo Fujita, Hiroshi Tatsumi
  • Technical Paper
  • 2019-32-0567
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
In this study, we investigated how to calculate and predict the air temperature distribution around the rider of a stationary motorcycle with the engine at idle. To analyze the air temperature distribution of an idling motorcycle, we needed to accurately predict the mixing of the forced convection air from the radiator fan and the natural convection air caused by the air temperature difference. For the calculation, we used two types of turbulent flow models: realizable k-ε (RKE) and detached eddy simulation (DES). First, in view of the mixing of the radiator exhaust with outside air, we made three-dimensional measurements of the air temperature distribution around the vehicle body to evaluate the accuracy of calculations made by the two models. We then used the models to predict the air temperature distribution around the rider for different air outlet duct configurations as well as for two motorcycles with different displacement values. The results showed that, although the RKE model effectively reproduced the qualitative trend of the air temperature distribution, it showed poorer prediction accuracy than the DES…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Method of Experimental Identification of Change in Dynamic Characteristics of Rolling Tires

SAE International Journal of Passenger Cars - Mechanical Systems

Honda Motor Co., Ltd.-Takahiro Uesaka
ESTECH Co., Ltd.-Tatsuya Suma
  • Journal Article
  • 2015-01-1523
Published 2015-04-14 by SAE International in United States
Development of simulation technology for road noise while a vehicle is in operation has become an important issue. Because a fixed technological architecture has been established for simulation of the body and the suspension, the issue in realizing road noise simulation is how to accurately identify the force transmitted to the suspension through the tires and wheels by vibration input due to contact between the road surface and the tires. The issue here is that there are significant variations between static state characteristics, which are easy to measure, and vibration characteristics of tires in motion, which are challenging to measure. A variety of expertise regarding the sources of this discrepancy has been published. Among these, the effects of Coriolis and centrifugal forces resulting from the rolling motion are known. However, knowledge is still lacking in areas such as the specifics of how the input from the tires changes due to these fluctuations in characteristics. In this project, a simple method was proposed that makes it possible to verify fluctuations of transmission force in the range…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Study on Spray Combustion Characteristics of Fatty Acid Methyl Ester Mixed with Diesel Oil

Honda Motor Co., Ltd.-Hiroomi Hagio
Tokai University-Akihiko Azetsu
Published 2014-11-11 by SAE International in United States
The objective of this study is to understand the fundamental spray combustion characteristics of FAME mixed with diesel oil. To examine the phenomena in detail, diesel spray flame formed in a constant volume high pressure vessel was visualized and the flame temperature and the KL factor were analyzed by two color method of luminous flame. The FAMEs examined in this study are PME, RME and CME, and compared with the combustion characteristics of diesel oil. From the systematic experiments, it is confirmed that the ignition delay and combustion period of bio diesel fuels are almost equivalent with those of diesel oil. The flame temperature decreased slightly with the bio fuel. Furthermore the total KL factor, a measure of the amount of soot in flame, decreased drastically by using the bio diesel fuel in the order of the mass fraction of oxygen in the molecule.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Estimation of CO2 Reduction Potential in Japan by Traffic-Flow Smoothing and Eco-Driving Promotion

Honda Motor Co., Ltd.-Koji Sengoku
Honda R&D Co., Ltd.-Hidetoshi Imaizumi
Published 2013-04-08 by SAE International in United States
This paper clarifies influence rate of traffic-flow and eco-driving factors that have effect on on-road fuel economy and a case study was conducted to estimate the CO₂ reduction potential due to traffic-flow smoothing and eco-driving promotion by analyzing floating car data from throughout Japan. The data employed in the study was obtained from hybrid vehicles equipped with an Eco Assist system. Previous research has reported that repeated use of these vehicles enhances fuel economy by approximately 10%. First, multiple regression analysis was performed on the subject floating car data to obtain a polynomial with fuel economy as the explained variable and items related to traffic flow and eco-driving as the explanatory variables. Average travel speed was found to have the greatest effect on fuel economy. In order to calculate the potential reduction in CO₂ emissions, the distributions of the explanatory variables were set for present conditions and assumed conditions of smoother traffic flow and more eco-driving promotion. These assumed conditions were applied to the polynomial and the CO₂ reduction potential was calculated. The assumed conditions…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Test on US Market's Receptivity to Aspheric Driver Side Mirrors

Honda Motor Co., Ltd.-Tausuke Mukai, Toshihiro Hashimoto
Published 2012-04-16 by SAE International in United States
This paper examines driver receptivity to an aspheric mirror, which contains an outer part with gradually-changing curvature and a flat inner part that we developed to reduce blind spots on the side and to the rear of the driver side of a vehicle. Reflection in a mirror where curvature changes gradually can, generally, cause binocular rivalry depending on curvature settings. We compared this mirror with a conventional mirror under actual driving conditions in the market to examine the levels of burden an aspheric mirror imposes on the driver in three categories of subjective measures: cognitive burden (effort), misrecognition, and physical burden. In terms of the cognitive burden (effort) and misrecognition, it was shown that an aspheric mirror can be used, after learning how to use it, with the same level of burden as a conventional mirror. As for the physical burden, it was indicated that there is no special type of burden that is specific to aspheric mirrors. Based on these findings, we determined that US drivers are receptive to the newly developed mirror.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Approach of INTERNAVI for Low-Carbon Society~New Approach on Environment by Advanced Telematics Service

Honda Motor Co., Ltd.-Takeshi Imai, Takuro Masuda, Yuichiro Ishido, Koji Sengoku
  • Technical Paper
  • 2010-08-0223
Published 2010-05-19 by Society of Automotive Engineers of Japan in Japan
Aiming the "Safety" and "Comfort" driving, Honda starts telematics service name "Internavi premium club" since 2002 in Japan. "Internavi premium club" has 1 million subscribers at November 2009. This time, we explain the services of "Internavi premium club" which is related the approach for low-carbon society.