Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 27, 2019 - November 29, 2019
When developing a control law for a vehicle as a plant it has become possible to design while paying attention to the state variables in the plant with the development of modern control theory. In this context, in order to analyze the static stability and dynamic stability of the plant at a higher level, the definition of static stability and dynamic stability, and the static stability and dynamic stability. The motivation for this research is to clarify the relationship between stability and state variables. In general, static characteristics in automotive engineering often refer to US and OS characteristics that are determined by the positive and negative recovery moments. On the other hand, static stability in control engineering is determined by the constant term of the characteristic equation. Comparing the two judgment methods, especially assuming an OS below the critical velocity, the former recovery moment judgment is negative to be static instability. But the latter characteristic equation is positive in the constant term judgment to be statically stable. This is the contradictions. In this Research, after clarifying this contradiction, the relationship between static stability and dynamic stability is examined again, and the results of investigation and arrangement of stability from both the automotive engineering and control engineering reports are reported. Furthermore, regarding the stability of the Plant (vehicle) required in the design of steering (steer-by-wire, SBW) control laws to enhance or compensate for vehicle motion, new definitions of static stability and dynamic stability.
