62results about How to "Improve time accuracy" patented technology

The invention discloses a clock control device, an air conditioning system and a clock control method for the air conditioning system. The device comprises a switching module, wherein the switching module is used for switching the communication line of each controller into a connection line under a situation that the controllers of more than two air conditioners are subjected to a power failure; through the connection line, charging and discharging modules in all power-failure controllers are connected in parallel, and power is supplied to the clock module of one appointed controller through the charging and discharging modules in all power-failure controllers; after all power-failure controllers are electrified, the connection line is switched back to the communication line; and through the communication line of the appointed controller, the clock information of the clock module of the appointed controller is synchronized to other controllers in all power-failure controllers. By use of the scheme of the invention, the problem that timing accuracy is affected since the cruising ability of a clock chip is weak can be solved, and an effect on improving the cruising ability of the clock chip to improve timing accuracy is achieved.

The invention relates to a 1pps pulse signal timing method and belongs to the technical field of wireless communication networks. The present invention mainly realizes the high-precision timing function of NMEA‑0183+1pps on the STM32F407 platform. In the synchronous system, the 1pps pulse (1 PULSE PER SECOND one pulse output per second) is mainly used. This pulse is a standard TTL logic output form. When the navigation output is valid, the rising edge of the pulse corresponds to the time. The function of the 1pps pulse here is to use its rising edge as the UTC time synchronization signal, and then realize time synchronization by analyzing the NMEA‑0183 protocol.

The invention discloses a sand grain simulation ball with an automatic timing function and a simulation timing method. The simulation ball comprises a hollow simulation ball body, a water feed pipe, a pressure sensor, a timer and a data interface. The simulation ball body is provided with a first hole and a second hole. The center of the first hole, the center of the second hole and the sphere center of the simulation ball form a straight line. The water feed pipe is arranged in the first hole. The end, away from the simulation ball body, of the first hole is provided with a sealing device. One end of the water feed pipe is connected with the pressure sensor. The pressure sensor is connected with the data interface through the timer. The data interface is arranged in the second hole. The end, away from the center of the simulation ball body, of the second hole is plugged through a rubber plug. According to the sand grain simulation ball, automatic timing of the process that the sand grain simulation ball is released and runs out of a flushing pit is achieved, and the problems that that the manual timing is large in workload and error are solved; once the simulation ball is released, automatic timing can be conducted by triggering the timer through the pressure sensor, and the initial timing error caused by manual release is reduced.