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481.
G. H. Lee W. C. Choi S. I. Kim S. O. Kwon J. P. Hong 《International Journal of Automotive Technology》2011,12(2):291-297
This paper identifies a control method used to reduce torque ripple of a permanent magnet synchronous motor (PMSM) for an
electric power steering (EPS) system. NVH (Noise Vibration Harshness) is important for safe and convenient driving. Vibration
caused by motor torque is a problem in column type EPS systems. Maintaining a very low torque ripple is one solution that
allows for smoother steering. Theoretically, it is possible to design and drive the motor without torque ripple. However,
in reality, a PMSM system torque ripple is caused by the motor itself (saturation in the iron core and EMF distortion) and
the imperfect driver. This paper analyzes torque ripple of a PMSM system, and an advanced PMSM control method for the column
typed EPS system is presented. Results of the analysis indicate that the compensation current is needed in order to minimize
torque ripple when a PMSM is driven. 相似文献
482.
B. Suh A. Frank Y. J. Chung E. Y. Lee Y. H. Chang S. B. Han 《International Journal of Automotive Technology》2011,12(1):131-139
This research concerns the design of a powertrain system for a plug-in parallel diesel hybrid electric bus equipped with a
continuously variable transmission (CVT) and presents a new design paradigm for the plug-in hybrid electric bus (HEB). The
criteria and method for selecting and sizing powertrain components equipped in the plug-in HEB are presented. The plug-in
HEB is designed to overcome the vulnerable limitations of driving range and performance of a purely electric vehicle (EV),
and it is also designed to improve the fuel economy and exhaust emissions of conventional buses and conventional HEBs. Optimization
of the control strategy for the complicated and interconnected propulsion system in the plug-in parallel HEB is one of the
most significant factors for achieving higher fuel economy and lower exhaust emissions in the hybrid electric vehicle (HEV).
In this research, the proposed control strategy was simulated to prove its validity using the ADVISOR (advanced vehicle simulator)
analysis simulation tool. 相似文献
483.
J. Hwang D. Lee K. Huh H. Na H. Kang 《International Journal of Automotive Technology》2011,12(1):119-124
The longitudinal and lateral vehicle control techniques have been widely used in several active driver assistance systems.
The adaptive cruise control, lane keeping assistant control, vehicle platooning and stop-and-go control are typical examples
of the most important applications. In this study, a novel path planning method is proposed considering the driving environment
such as road shape, ego vehicle and surrounding vehicles’ movement. The relative distance and velocity between the ego vehicle
and surrounding vehicles are identified with respect to the predicted lane shape in front of the ego vehicle. Based on the
identified information, the road shape and surrounding vehicles are mapped into the intensity image and the desired vector
for the ego vehicle’s movement is determined by the maximum intensity density tracing method. The desired vehicle path is
followed by the acceleration/deceleration control and the steering assist control, respectively. In order to evaluate the
performance of the proposed system, simulations are conducted and compared with ACC systems. 相似文献
484.
Sahbi Khanfir Kazuhiko Hasegawa Vishwanath Nagarajan Kouichi Shouji Seung Keon Lee 《Journal of Marine Science and Technology》2011,16(4):472-490
With a recent increase in ship capacity and propulsion performance, a wide-beam ship fitted with a twin-rudder system has
been adopted in many cases. However, to improve ship manoeuvring, it is still necessary to have a better understanding of
rudder-hull interactions in twin-rudder ships. Captive model tests (oblique towing and circular motion test) as well as free-running
tests with a single-propeller twin-rudder ship and a twin-propeller twin-rudder ship are carried out. The effect of drift
angle on the rudder forces and some peculiar phenomena concerning rudder normal force for twin-rudder ships are evaluated.
A method for estimating the hull-rudder interaction coefficients based on free-running experimental results is proposed. 相似文献