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Broadly-applicable Adaptive Damper System without Use of Dedicated Sensors

Article of Honda R&D Technical Review Vol.29 No.1

Summary

An adaptive damper system that does not require the use of dedicated sensors has been developed. Employing the proportional relationship between front wheel speed and contact load, which change with input from the road surface, the system estimates the vehicle’s vertical vibration state quantity using only the wheel speed, longitudinal acceleration, and yaw rate signals conventionally employed for systems such as Vehicle Stability Assist and airbag systems in Supplemental Restraint System. This does away with the necessity for the use of sensors for the measurement of the vertical acceleration of sprung mass and suspension stroke sensors. Using the estimated values, the system boosts ride comfort through the application of damping force control by adaptive dampers in order to control vertical vibration. In addition, the system also offers unsprung mass control and pitch and roll control in order to boost road-holding performance and handling and stability performance. The adaptive damper units feature a triple-tube configuration with externally mounted pressure-control solenoid valves, making it possible to set the damping force characteristic and the range of variation in damping force to match the weight, size, and concept of different vehicles. The developed system is capable of application to a wide range of vehicle categories.

Reference

(1) Moravy, L., Nutting, J., Ellis, N.: Development of Active Damper System using Magnetorheological Dampers for 2007 Model Year Acura MDX, Honda R&D Technical Review, Vol.19, No.1, p.36 -41
(2) Ohsaku, S., Sanpei, M., Shimizu, E., Tomita, K.: Hisenkei H∞ Seigyo niyoru Semiakuthibusasupenshon, Journal of the Society of Instrument and Control Engineers, Vol.39, No.2, p.126-129 (2000) (in Japanese)
(3) Izawa, M., Kanda, R.: A Skyhook Control Using Estimated Vehicle State by Wheel Speed Sensors, 2014 JSAE Annual Congress Proceedings, No.35-14, p.1-4 (2014) (in Japanese)
(4) Izawa, M., Kanda, R.: A Skyhook Control Using Estimated Vehicle State by Wheel Speed Sensors (Second Report), 2014 JSAE Annual Congress Proceedings, No.103-14, p.11-16 (2014) (in Japanese)
(5) Kikuchi, H., Hirayama, K., Nakajima, H.: Practical Applications of Dynamic Body Motion Control System without Vertical Accelerometer, 2016 JSAE Annual Congress Proceedings, No.28-16S, p.662-667 (2016) (in Japanese)
(6) Liu, Y., Hozumi, J., Morita, M., Higuchi, A.: Body Attitude State Estimation Using Wheel Rolling Speed Variations, 2015 JSAE Annual Congress Proceedings, No.67-15S, p.1578-1585 (2015)
(7) JSAE: Seigyokikou, Jidoushagijutu Handobook, Vol. 6, Sekkei (chassis)-hen, p.200-206 (2016) (in Japanese)

Author (organization or company)

Ryoma KANDA(Automobile R&D Center)、Yujiro NISHI(Automobile R&D Center)、Masaki IZAWA(Showa Corporation)

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