Active seat suspension for ultra-compact electric vehicle (Fundamental consideration on electrooculogram when fall from the bump)

Bioinstrumentation has been used in the automotive industry to evaluate the ride comfort level of different vehicles. However, there have been no studies attempting to incorporate bioinstrumentation in the controls. In this paper, we propose a ride comfort control system using the psychological state of the driver as estimated through bioinstrumentation. To evaluate the psychological state of the driver, we use the driver’s heart rate variability, which allows us to calculate the R-R interval and the LF/HF, the values of which reflect the activities of the autonomic nervous system. In this paper, we investigated the usefulness of a ride comfort control system using adequate bioinstrumentation and switching criterions for the system. As the results indicate, the drivers become relaxed when using the ride comfort control system as based on their psychological state. Moreover, the drivers become more relaxed when using LF/HF as the switching criterion for ride comfort.

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Ride comfort control system using driver’s psychological state: Experimental consideration on heart rate variability

Endo

Ikeda

Mashino

et al. 2019

International Journal of Applied Electromagnetics and Mechanics

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Vibration Characteristics Control of Resonance Point in Vehicle: Fundamental Considerations of Control System without Displacement and Velocity Information

et al. 2022

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The deterioration of ride comfort in ultra-compact vehicles has recently become an increasing concern. Active seat suspension was proposed to improve the ride comfort of ultra-compact vehicles. An active seat suspension is a vibration control device that is easily installed. The general vibration control system of the active seat suspension is fed back to the displacement and velocity by integrating the measured seat acceleration. This control has problems, such as control delay and deviation by integration. In this study, we focused on vibration control using acceleration directly. First, we established a control model that feeds back the acceleration to terminate the error occurring in the integral process and investigated the change in vibration characteristics in the case where the feedback gain of acceleration was changed. Second, the control system was analyzed to investigate the performance of the control based on the frequency characteristics. As a result, it was confirmed that the frequency response changes when the feedback gain is changed. In acceleration feedback control, ride comfort was improved by selecting a proper feedback gain because the characteristics of frequency were changed by the gain.

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Active seat suspension for ultra-compact electric vehicle (Fundamental consideration on electrooculogram when fall from the bump)

Cited by 2 publications

References 5 publications

Ride comfort control system using driver’s psychological state: Experimental consideration on heart rate variability

Ride comfort control system using driver’s psychological state: Experimental consideration on heart rate variability

Vibration Characteristics Control of Resonance Point in Vehicle: Fundamental Considerations of Control System without Displacement and Velocity Information

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