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All real automatic systems are nonlinear, non-stationary, with unstable parameters. The problem of the automated design of such systems with a high order (from the 4th above) has "narrow" places. The main thing is how to construct multidimensional quasi optimal "desirable" structure, with simple means, meeting contradictory requirements. It is offered to apply model management in the form of the standard rated characteristic equations with the maximum degree of stability (SRCE-MDS). The algorithm of parametrical control which is passing to the system of the nonlinear algebraic equations decision is it is described and reasonable in this article. The control example shows how it works. Big stability of system characteristics at variations of parameters at control on SRCE-MDS is shown considerably. By this way we can construct multidimensional quasi optimal "desirable" structure. The other way is to use adaptive control systems.

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One of the main characteristics of hydrostatic drive based on axial piston hydraulic motor is a control range of rotating frequency of output shaft at rated load. This characteristic is defined by frictional forces stability in kinematic couplings and design features of this type of hydraulic motor. The article considers the structural scheme of the axial piston two-unit hydraulic motor with hydrostatic unloading of cylinder-piston coupling. Preliminary results of the hydraulic motor prototype testing designed according to this scheme are described.

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