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Fault diagnosis method for high-speed-train traction-motor nonlinear system sensor

The invention discloses a fault diagnosis method for a high-speed-train traction-motor nonlinear system sensor. The method is characterized by firstly, establishing a traction motor state equation and an output equation, expanding a state vector and a fault vector into an augmented vector and acquiring an augmented system state space description equation; for the established augmented system state space description equation, designing an interval observer based on a unknown input observer and constructing an augmented system error dynamic equation; according to the augmented system state space description equation, acquiring a high speed train traction motor fault diagnosis observer gain matrix based on the unknown input observer and the interval observer; and carrying out equivalent linearity transformation on an augmented system so that a system error distribution matrix satisfies a Metzler matrix, and according to the designed observer, acquiring a state estimation value so as to complete on-line fault diagnosis and fault estimation. By using the method, fault diagnosis performance can be increased so that real-time fault diagnosis and fault estimation can be performed on the traction motor system sensor.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Method for operating an internal combustion engine

The invention relates to engine building, and specifically to reciprocating internal combuston engines. The technical result of the invention consists in simplifying the design, the possibility of monitoring and regulating the moment of self-ignition of a homogenized fuel-air mix, and reducing the specific flow rate of the fuel. The method for operating an internal combustion engine consists in feeding a charge to the combustion chamber of a main cylinder and an auxiliary cylinder which are connected to one another and have different diameters, and in which the pistons are arranged. The piston of the auxiliary cylinder is delayed in accordance with the shaft rotation phase with respect to the piston of the main cylinder and as the piston of the main cylinder reaches the upper dead center thereof, when the majority of the charge is located in the auxiliary cylinder, and the charge to the piston of the auxiliary cylinder is boosted. The piston of the main cylinder is used to compress the mix without bringing said mix to self-ignition and therefore preparing said mix for subsequent rapid ignition, while the piston of the auxiliary cylinder is used to boost the compressed homogenized fuel-air mix, and said mix is brought to the temperature and pressure in the combustion chamber prior to compression self-ignition of the mix.
Owner:GABDULLIN RIVENER MUSAVIROVICH
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