4 results about "Time ratio" patented technology

The invention discloses a narrow pulse suppression method and device for dynamic adjustment of dead time, a medium and a controller, and the method comprises the steps: presetting the dead time of M periods in the future according to the real-time state of a motor and the dead time and current change rate of the first N periods, and outputting a working condition label at the same time, N and M being positive integers; determining target dead zone time Td according to the working condition label and the dead zone time of the M periods in the future; determining a dead zone time ratio Dd according to the target dead zone time Td, constructing an interval section of a PWM signal according to the dead zone time ratio Dd and a narrow pulse time ratio Dp, and constructing an upper bridge arm duty ratio function Dt and a lower bridge arm duty ratio function Db corresponding to each interval section according to the dead zone time ratio Dd and a duty ratio instruction Dm of the PWM signal; according to the interval section where the duty ratio instruction Dm of the PWM signal is located, a duty ratio function of the corresponding interval section is called, and a target PWM signal is output.

The invention relates to the technical field of availability allocation, in particular to an inherent availability allocation method fully considering system redundancy and fault influence. The method comprises the following steps: selecting similar products, and listing component names, failure rates and redundancy numbers of the similar products and analyzed products; calculating an unavailable time estimated value of each part of the analyzed product by referring to fault influence data of similar products; calculating an unavailable time ratio of each component of the analyzed product based on the unavailable time estimated value of each component of the analyzed product; and by taking the unavailable time ratio of each component as a distribution coefficient, carrying out product availability distribution, and calculating the availability distribution value of each component of the analyzed product. According to the availability allocation method provided by the invention, based on theoretical data calculation, an availability index allocation method which is applicable to whether the next-level structure of a product is single or not and whether redundancy exists or not and can fully consider the fault influence is constructed, so that the accuracy of availability allocation is realized, and the application range is widened.

This invention relates to the field of oilfield engineering technology, and particularly to an intelligent operation control method and system for pumping units based on negative power time ratio identification. The control method includes setting the operating parameters of the drive motor, starting the pumping unit at a set high speed; reading the set values ​​or calculating the duration of each stroke, statistically analyzing the duration of zero or negative power values, and calculating the proportion of zero or negative power in the stroke time; continuously collecting the proportion of zero or negative power in each stroke time, and determining whether the change in the proportion of zero or negative power in the stroke time over time is less than a cavitation threshold. If cavitation is determined, a speed control phase begins, with the motor running at low speed; after running for a specified duration, the motor controller increases the motor speed to run at high speed again; this process is repeated. The control method provided by this invention automatically adjusts the pumping unit operating parameters in real time, optimizes the pumping unit's operating conditions, extends the pump inspection cycle, reduces energy consumption, and saves manual labor.