International Journal of Automotive Engineering
Online ISSN : 2185-0992
Print ISSN : 2185-0984
ISSN-L : 2185-0992
最新号
選択された号の論文の4件中1~4を表示しています
Research paper
  • Takuma Ito
    2025 年 16 巻 1 号 p. 1-11
    発行日: 2025年
    公開日: 2025/01/31
    ジャーナル オープンアクセス
    Traffic accidents on community roads with occlusions are one of the unsolved social issues in Japan because advanced driver assistance systems and autonomous driving systems only using onboard sensors cannot behave adequately due to the occlusions caused by house walls. Although connected safety system is promising to prevent traffic accidents in such situations, placing roadside sensors at every intersection costs too much. Motivated by above backgrounds, this study proposes a connected collision avoidance system via a stochastic localization method that combines observation information from roadside sensors and onboard/portable devices of traffic participants for realizing the safety systems as well as reducing the necessary number of roadside sensors. To evaluate the proposed system from the viewpoints of uncertainty of the observation due to the layout and the specification of roadside sensors, this study conducts simulations in the course that modeled community roads in the actual town. As a result, this study confirms that the proposed method realizes the collision avoidance between an automobile and a bicycle even on a condition of a sparse layout of the roadside sensors owing to the concept of the stochastic localization based on the extended Kalman filter. The findings of this study will contribute to realization of the connected safety system on community roads with occlusions under the reasonable implementation conditions that roadside sensors will not be fully installed at every intersection.
  • Hiroshi Kuniyuki, Seiya Tanaka, Fumitaka Fukuzawa, Masashi Makita
    2025 年 16 巻 1 号 p. 12-17
    発行日: 2025年
    公開日: 2025/01/31
    ジャーナル オープンアクセス
    This study analyzed the effects of road alignment on visibility delay for curves with experiments using a driving simulator. The results showed that the visibility behavior for curves was the first recognition of the existence of the curve, followed by the recognition of the curvature of the curve. Furthermore, it was found that the curve visibility delay in those phases was influenced by the left-right difference and the difference in curvature. In particular, there is a tendency for drivers to be late in noticing sharp left turns. It would be useful to warn the driver of the existence of a sharp curve at least 150 m before the curve and to encourage the driver to decelerate to prevent accidents. In addition, a left curve with an additional left lane can improve curve recognition, and expanding the shoulder or other space on the left side of the lane would be advantageous for curve recognition.
Review article
Technical Note
  • Taisei Kusano, Koki Shige, Tatsuya Inoue, Yuta Oba, Naoyuki Takeda, Os ...
    2025 年 16 巻 1 号 p. 27-32
    発行日: 2025年
    公開日: 2025/01/31
    ジャーナル オープンアクセス
    This study focuses on reducing noise generated by heating, ventilation, and air conditioning (HVAC) systems in electric vehicles to enhance in-cabin comfort. To achieve this, we employed feedback active noise control (ANC) with a real-time filter update in the frequency domain. A novel control algorithm was developed using a sliding discrete Fourier transform for each sample, along with a gradient descent method for noise adaptation in the frequency domain. Numerical analysis first confirmed the effectiveness of the feedback control (FB) approach, and subsequent experiments were conducted on a commercial electric vehicle. A microphone installed on the map lamp was used to reference the noise generated by the air conditioner. The experimental results demonstrated that feedback control reduced noise by approximately 3.0 dB (O.A. [A]) in the 20–200 Hz frequency band, showing significant potential for improving vehicle quietness.
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