To a question about ways of forming a signal for producing additional torque of electric power steering system

With a view of increase of dynamic accuracy of electric power steering system (EPSS) the following problems have been solved: the mathematical model with the account kinematic parts has been developed, the nature of dynamic mistakes has been revealed, the control's algorithm as a signal of the task for development of the compensating steering torque of the electric motor has been synthesized, allowing to form on the output shaft of the EPSS the moment proportional to the effort put to a steering wheel by the driver in static and dynamic modes. Reducerfree EPSS represents a mechatronic unit, which based on permanent magnet synchronous motor with built-in torque sensor. The control algorithm is rather simple and provides additional torque on output of the steering column proportionally to the torque which driver applies to a steering wheel. But the complexity consists in formation of a forward signal for motor's control to reduce the steering activity required of the driver and to save a realistic feeling of actual motoring conditions by compensating of design features of the mechatronic unit. We addressed this problem in two ways: by developing methods to compensate for the motor's inertia and elastic torque and by developing torque's measuring system. In particular, the control algorithm offered by authors improves self return of steering wheel, and the developed elements of the measuring system of EPSS simplify realization of control's algorithm and promote safety of drive.