34results about How to "Improve the success rate of starting" patented technology

A starting circuit and a control method for an aviation APU are provided. The APU starting circuit may include: a starting controller, which is used to provide controlled starting power to the aviation auxiliary power unit; a first contactor, which is used to connect between the transformer rectifier that converts alternating current into direct current and the starting controller; The second contactor is used to connect between the storage battery and the starting controller, wherein the first contactor and the second contactor are interlocked so that when one of the first contactor and the second contactor is turned on, the other is One is disconnected; the third contactor is used to connect between the transformer rectifier and the DC power supply bus bar, wherein the DC power supply bus bar is used to supply power to the aviation DC system, wherein the first contactor and the third contactor are connected to each other A lock such that one of the first contactor and the third contactor is turned on when the other is turned off. A starting method for an aviation auxiliary power unit is also provided.

The present application belongs to the field of aero-engine fuel supply, and in particular relates to a method for correcting fuel supply for aero-engine plateau starting. Including: obtaining the power characteristic coefficient ε of the auxiliary power system, and the power ratio coefficient λ of the auxiliary power system, and calculating the auxiliary power correction coefficient K 辅助 ;Get the correction factor K according to the engine characteristics 常规 , and the engine ground cranking speed rise rate N 2 Dot _地面 , calculate the engine plateau starting speed increase rate N 2 Dot _高原 ;According to the engine plateau starting speed increase rate N 2 Dot _高原 , calculate the main fuel supply rule. According to the power retention characteristics of the auxiliary power system, this application corrects to obtain a more real auxiliary power, and comprehensively converts the ratio between the auxiliary system power and the turbine power within the starting speed range into the speed increase rate correction amount, and corrects the starting process so that the The speed increase rate is more matched with the actual residual power, and the fuel supply is corrected to give full play to the starting potential, shorten the starting time, and improve the starting success rate.

The invention discloses a starting control method and device of a combustion gas turbine. A combustion regulating valve is controlled by adopting matching of three elements for providing fuel to the combustion gas turbine: a real-time rotating speed measurement value is matched with a rotating speed-openness curve to obtain a first combustion regulating valve openness; the real-time rotating speed measurement value is matched with a rotating speed-rotating speed climbing rate curve to obtain a corresponding rotating speed climbing rate, so that a current rotating speed PID (Proportion Integration Differentiation) given value is figured out, a second combustion regulating valve openness is obtained through the calculation of PID; the real-time rotating speed measurement value is matched with a rotating speed-temperature climbing rate curve to obtain a corresponding temperature climbing rate, so that a current temperature PID given value is figured out, and a third combustion regulating valve openness is obtained through calculation of PID; and the minimum value of the three combustion regulating valve opennesses is used as a final combustion regulating valve openness. According to the invention, the combustion regulating valve openness can be immediately corrected according to the change conditions of the rotating speed and the temperature, and thus the starting success rate can be increased.

The invention discloses a sensorless starting method for a brushless DC motor with a large inertia rotor, comprising the following steps: Step 1, initialization; Step 2, positioning; Step 3, detection; Step 4, calculation; Step 5, starting; In the above step 1, the system is initialized according to the rated current of the motor and the rated current of the driver, and the maximum starting current limit I max ; Wherein in above-mentioned step 2, then continuously inject positioning current twice to motor, current value is less than I max , the duration is 1s, ensuring two successful positionings; the invention adopts two-step positioning and limiting current start to facilitate fast and accurate positioning of the motor, avoiding positioning failure caused by the zero point of the initial position of the motor rotor, and the limiting current ensures The rotor of the motor is dragged to the specified position. At the same time, the starting curve is designed to ensure that the frequency and voltage boost curve is smooth, the motor does not lose synchronization and the angle error between external synchronization and self-synchronization is within 0°-30° electrical angle, and the motor speeds up smoothly.

The invention discloses an engine starting system. The engine starting system comprises a starter, a transmission assembly and an auxiliary starting mechanism. The auxiliary starting mechanism comprises a first worm and gear assembly, a first drive component, a second drive component and a clamping component. The first drive component can be used for driving a first worm to move between a meshing position and a separating position. The second drive component drives the first worm to move in the axial direction of the first worm. In this way, the first worm can output power from the second drive component to the transmission assembly, and the output end of the transmission assembly outputs the power to a crankshaft of an engine to start the engine. According to the engine starting system, the engine is started through the starter and the auxiliary starting mechanism, so that the dependence on the starter of a finished vehicle is reduced, and the working time of a starter storage battery in a cold state is prolonged. Accordingly, the starting success rate of the finished vehicle is increased, and then the reliability of the vehicle is improved.