Detection system based on zero-point real-time refreshing calculation for real-time rotation measurement

A detection system based on a zero-point real-time refreshing calculation for real-time rotation measurement, the detection system comprising:

• an analog quantity sensor, a programmable logic controller (PLC), a storage unit, and a display;
• wherein the storage unit comprises three common storage units, and the common storage units comprising RU1, RU2, and RN;
• wherein an output port of the analog quantity sensor is connected to an input port of the PLC using a data cable, an output port of the PLC is connected to an input port of the display using a data cable, and a storage interface of the PLC is connected to the storage unit using a data cable;
• wherein the analog quantity sensor is associated with one detected object, and the PLC is associated with a plurality of analog quantity sensors based on a capacity and a calculation capability;
• wherein the PLC is configured to define the storage unit as three common storage units, and the three common storage units are respectively RU1, RU2, and RN;
• and
• wherein the PLC is further configured to define a loop execution module, the loop execution module performing the following operations:
• acquiring a sensor signal containing a quantity of pulses A(n);
• storing A(n) in RU2, and calculating a value RN as being equal to a difference between the contents of RU2 and RU1 as RN=RU2−RU1;
• calculating a real-time rotation speed RS(n) of the detected object and a quantity RT(n) of rotations of the detected object;
• transferring contents of RU2 to RU1;
• and
• performing a next acquisition, wherein
• at a zero point of each sampling segment n, a signal at a previous moment is acquired and then subjected to an operation, to obtain a real-time rotation speed RS and a quantity RT of rotations at a current moment;
• and
• wherein the real-time rotation speed RS(n) and the quantity RT(n) of real-time rotations are calculated according to the following equations:
• RS(n)=(RN(n)*60)/(T(n)*AT);
• and
• RT(n)=RN(n)/AT, wherein
• T(n) is a time length of the nth sampling segment;
• RN(n) is the contents of RN at the nth sampling segment and
• AT is a quantity of pulses of the sensor signal and/or rotations of the detected object.