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Influence of Secondary Flow Generation on Heat Transfer inside the Fin Type Spiral Sub-Cooled Condenser by Experimental and CFD Analysis

Keihin Corporation-Junya Washiashi, Jun Liu
Sophia University-Hardeep Singh, Takashi Suzuki, Mitsuhisa Ichiyanagi
Published 2018-10-30 by SAE International in United States
This paper discusses the compact structure, innovative and unique approach of high performance spiral coil sub-cooled condenser for compact power plant/engine applications. The motivation behind this study is to reduce the engine emission by improving the coefficient of performance for air-conditioning unit. Since the air conditioning system is the most power consumption units after the power plant, so it significantly affects the fuel consumption and the hazardous gas emissions. In the air condition cycle, the condenser unit is addressed as one of the important devices, and thus, the author tried to reduce the energy consumption by improving the performance of the condenser. The most advantage points of this study is to use spiral coil sub-cooled condenser, which elaborates the effect of secondary flow generation inside the fluid and is known as the Dean’s effect. This results in the heterogeneous temperature distribution across the periphery of the tube and lead to a greater heat transfer. The heat transfer characteristics for the tube-fin type with spiral coil and square cross-section have been determined experimentally and then compared…
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Modeling of Quasi-Steady State Heat Transfer Phenomena with the Consideration of Backflow Gas Effect at Intake Manifold of IC Engines and Its Numerical Analyses on 1-D Engine Simulation

Sophia University-Emir Yilmaz, Mitsuhisa Ichiyanagi, Takashi Suzuki
Published 2018-10-30 by SAE International in United States
An empirical equation was developed for modeling the heat transfer phenomena taking place in an intake manifold which included the backflow gas effect. In literature, heat transfer phenomenon at intake system is modeled based on steady flow assumptions by Colburn analogy. Previously, authors developed an equation with the introduction of Graetz and Strouhal numbers, using a port model experimental setup. In this study, to further improve the empirical equation, real engine experiments were conducted where pressure ratio between the intake manifold and engine cylinder were added along with Reynolds number to characterize the backflow gas effect on intake air temperature. Compared to the experimental data, maximum and average errors of intake air temperature estimated from the new empirical equation were found to be 2.9% and 0.9%, respectively. Furthermore, Colburn analogy and suggested empirical equation were consecutively implemented to 1-D engine simulation software on gasoline and diesel engine setups. Naturally aspirated gasoline engine simulations revealed the importance of the backflow gas effect in line with the real engine experiments. Maximum and average temperature differences between the…
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Development of the Anti-Lift-Control for Motorcycle

Suzuki Motor Corporation-Taiki Mase, Takashi Suzuki
Published 2018-10-30 by SAE International in United States
In motorcycle market, there is demand for technology that makes it possible to drive fast safely. One such technology has already been commercialized; control that prevents front lift while enabling maximum acceleration performance. We have developed a more accurate version of this control.In order to maximize acceleration performance, it is necessary to keep front lift angle as close to zero as possible. Reducing output driving force helps to keep the front lift angle low, but if output driving force is reduced too much, it will degrade acceleration performance. Feedback control that reduces output driving force when front lift is detected is effective for optimizing this trade off, but increasing feedback gain too much to reduce front lift angle will cause output driving force to change suddenly, making for a less comfortable ride. In order to solve this problem, we introduced feedforward control that estimates the equilibrium between power and front lift and restricts output driving force. Estimates should be made by measuring the pitching angular acceleration of the actual body of the vehicle in order…
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Modeling of Unsteady Heat Transfer Phenomena at the Intake Manifold of a Diesel Engine and Its Application to 1-D Engine Simulation

Sophia University-Emir Yilmaz, Hayao Joji, Mitsuhisa Ichiyanagi, Takashi Suzuki
  • Technical Paper
  • 2017-32-0097
Published 2017-11-05 by Society of Automotive Engineers of Japan in Japan
In the past two decades, internal combustion engines have been required to improve their thermal efficiency in order to limit hazardous gas emissions. For further improvement of the thermal efficiency, it is required to predict the mass of intake air into cylinders in order to control the auto-ignition timing for CI engines. For an accurate prediction of intake air mass, it is necessary to model the heat transfer phenomena at the intake manifold. From this intention, an empirical equation was developed based on Colburn equation. Two new arguments were presented in the derived formula. The first argument was the addition of Graetz number, where it characterized the entrance region thermal boundary layer development and its effect on the heat transfer inside the intake manifold. As the second argument, Strouhal number was included in order to represent intake valve effect on heat transfer. This study compared experimental data with the present empirical equation, and average error was estimated to be 3.1%, which was significantly improved in comparison with the Colburn equation. Furthermore, derived empirical heat transfer…
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2-Drive Motor Control Unit for Electric Power Steering

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

DENSO Corporation-Mikihiro Hiramine, Yoshitaka Hayashi, Takashi Suzuki
  • Journal Article
  • 2017-01-1485
Published 2017-03-28 by SAE International in United States
The electric power steering (EPS) is increasing its number since there are many advantages compared to hydraulic power steering. The EPS saves fuel and eliminates hydraulic fluid. Also, it is more suitable to the cooperation control with the other vehicle components. The EPS is now expanding to the heavier vehicle with the advance in the power electronics. In order to meet customer's needs, such as down-sizing, lower failure rate and lower price, we have developed the new motor control unit (MCU) for the EPS. The motor and the electric control unit (ECU) were integrated for the better installation. We adopted new technologies of redundant 2-drive design for more safe EPS. “2-drive Motor Control technology” which consists of dual winding, two torque sensors and two inverter drive units. In our developed MCU, even if there is a failure in one of the drive unit, the assistance of the EPS can be maintained with the other drive unit.
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Adaptation of Turbocharger to Small Displacement Single Cylinder SI Engine

Sophia University-Duan Chaoran, Yujiro Fujita, Mitsuhisa Ichiyanagi, Takashi Suzuki
  • Technical Paper
  • 2015-32-0823
Published 2015-11-17 by Society of Automotive Engineers of Japan in Japan
This paper represents the adaptation of turbo charger to single cylinder 450cc SI engine which is used for the student formula competition. The experiment and 1D engine simulation called as GT-Power were performed to confirm the effect of valve profile, compression ratio and air fuel ratio on the engine performance under the naturally aspirated condition. The maximum valve lift of the intake valves increased 27% and that of the exhaust valves increased 15% as compared with the low profile cam. The compression ratio was increased from 12.3 to 13.5 by changing the piston top land length in order to improve the thermal efficiency. It was confirmed that the torque peak was moved from 6000 rpm to 8000 rpm by changing the valve profile. Furthermore, turbo charger was adapted to the engine as changing the capacity of the turbocharger, the maximum boost pressure and the air fuel ratio. The capacity of the turbocharger was changed with expansion and contraction of the performance map of RHF25 manufactured by IHI Corporation. The genuine capacity of RHF25 worked along…
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Implementation of Air-Fuel Ratio Feed-Forward Controller Considering Heat Transfer at Intake System to SI Engine

Sophia Univ.-Mitsuhisa Ichiyanagi, Takashi Suzuki
Published 2015-09-01 by SAE International in United States
For further development of the thermal efficiency of SI engines, the robust control of the air-fuel ratio (A/F) fluctuation is one of the most important technologies, because the A/F is maintained at the theoretical constant value, which causes the increase of the catalytic conversion efficiency and the reduction of pollutant emission. We developed the robust controller of the A/F, which is the method to change the fuel injection rate by using the feed-forward (FF) controller considering the heat transfer at the intake system. The FF controller was verified under transient driving conditions for a single cylinder, and the A/F fluctuations were reduced at approximately 84%.
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Aerodynamic Design for SR11 (Formula SAE Racing Car)

Sophia Univ.-Tetsuya Fujimoto, Takashi Suzuki
Published 2013-10-15 by Society of Automotive Engineers of Japan in Japan
Nowadays, cornering performance of FSAE (Formula SAE) cars are dramatically improved due to less mass, kinematic developments and tires. In such circumstance, under high speed conditions, aerodynamical devices work better. It had been decided to attach aerodynamical devices that consist of front wing, rear wing, diffuser (floor) and deflector for SR11 (Fig. 1, Table 1), a FSAE car developed by Sophia Racing (Japan).Fig. 1SR11Table 1Vehicle configuration of SR11To start with developing aerodynamical devices, it had been assumed that how they work. Lap time simulation had been done with VI-car-realtime, which shows the laptime could be shorten by 2 seconds of 60 seconds for a usual FSAE endurance course with 60kgf at 60km/h downforce. Dragforce had been assumed to work well while once, it had been supposed to have a bad influence for laptime. The reason why it works well is at high speed, it works as extra braking force even without tires doesn't contact with ground or unfavorable load distribution. Then, 60kgf downforce was a target, while no target with dragforce. To maximize downforce, optimization…
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Improving the Fuel Economy of Supercharged Engine

Sophia Univ.-Yoshiki Fukuhara, Naoya Kimata, Takashi Suzuki
Published 2013-10-15 by Society of Automotive Engineers of Japan in Japan
The paper reviews the experimental development of fuel economy of engine powering the 2012 Formula SAE single seat race car of the University of Sophia. The balance of high power and low fuel consumption is biggest challenge of racing engine. It was found that improving the efficiency of engine by supercharging as a way to achieve that. In order to adapt the supercharger for the engine, the important design points are below:It was found that intake air blow-by gas at combustion chamber is increased in low engine speed. To improve that, the valve overlap angle was changed to adopt supercharged engine and improve effective compression ratio. Typically the racing engine demands maximum torque for performance but that does not imply that the air fuel ratio should be rich than theoretical. The point is the maximum torque of the engine is proportional to the amount of air intake. Therefore, supercharged engine is possible to increase the supercharging pressure for bigger torque. But the base engine is not prepared for bigger torque, the damage of the engine…
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Reduction of Combustion Fluctuation of Gasoline Engine by Ignition Timing Control With Considering the Residual Gas

Sophia Univ.-Yusuke Nakano, Takashi Suzuki, Yasufumi Oguri, Mitsuhisa Ichiyanagi
  • Technical Paper
  • 2012-08-0556
Published 2012-10-03 by Society of Automotive Engineers of Japan in Japan
Improvement of engine power and fuel consumption is demanded in recent engine control system. However, combustion fluctuation that occur cycle by cycle, has not considered for engine control. Therefore, in this research, correlation of pressure fluctuation and residual gas ratio in cylinder is considered to use for control of the ignition timing. As a result of experiment in actual engine, the variability of indicated mean effective pressure was able to reduce more than 20% by the suggested ignition control method.