Name of the paper：”Principles and Applications of DYC in Transient State”, the first to the third report

  Issue：International Journal of Automotive Engineering Vol. 53 No. 3，4，6

  Author：Shigeharu Shibahata, Vlabo

  Yasuji Shibahata, Vlabo

Reasons for the award (summary)：Regarding the transient control method of DYC, Direct Yaw-moment Control: left-right distribution control of driving braking force;

①they have found a control method that provides the same characteristics as a vehicle with reduced yaw moment of inertia. This can essentially improve the transient dynamics of the vehicle.

②differential gear friction torque affects steering response characteristics by a significant margin.

③ when the control method in ① is applied to differential gears, the steering response characteristics can be improved by controlling the driving force.

④ they proposed a method to evaluate the response characteristics of nonlinear systems at the position of the roots of the characteristic equation.

⑤ the past empirical knowledge that straight driving is improved in four-wheel drive vehicles was clarified analytically by the restored yaw moment generated by the two differential gears in the front and rear.

The above new findings are fundamental to be considered in all vehicles equipped with differential gears including Evs, and are highly appreciated from an engineering and industrial perspective.

Comment from Visiting Professor Shibahata

There are still unresolved phenomena in the area of classical vehicle dynamics, which elucidates the characteristics of vehicle systems consisting only of mechanisms and tires. This paper is the work of a young engineer, the lead author, addressing the issues raised by the co-author, who has long engineering experience.  It was also a paper that challenged how far father and son could go in their cottage industry.  The "Vlabo" is a volunteer group open to anyone who wants to contribute to the technological evolution of vehicle dynamics.

VD, Vehicle Dynamics Performance, is a technical area that will continue to be required even as automobiles evolve into the era of EVs and automated driving. We hope that all the unexplained phenomena in the Classical Vehicle Dynamics area will be clarified. I hope that young and old will take up the challenge.