31results about How to "Controlled downtime" patented technology

The invention provides a method and device for avoiding abnormal shutdown of an air conditioner caused by voltage leap and the air conditioner, and relates to the technical field of air conditioners.The method includes the steps that input voltages and input currents are continuously sampled; the input voltages are recorded every first time interval; the difference between the recorded input voltages of every two consecutive times is calculated; and the compressor frequency is adjusted according to the difference, a voltage change threshold for comparison with the difference and the input currents. According to the method and device for avoiding the abnormal shutdown of the air conditioner caused by the voltage leap and the air conditioner, the current change is reflected through judgmentof the voltage change quantity within a certain time, different voltage change ranges correspond to different current protection values, and a compressor is controlled to reduce frequency and stop according to the voltage change so as to avoid abnormal shutdown of the compressor due to voltage fluctuations, so that the system operational stability is improved, and the user experience is improved.

The invention discloses an electrolytic capacitor-free motor driving system and a control method and device thereof. The method comprises the following steps of detecting an input AC voltage of the motor driving system in real time; judging whether an input AC power supply is disconnected for a short time or not according to the input AC voltage; and controlling a compressor motor to stop if the input AC power supply is disconnected for a short time. By the method, the compressor motor can be timely controlled to stop when the input AC power supply is disconnected for a short time, so that the compressor motor is effectively prevented from being out-of-control or the motor driving system is effectively prevented from being damaged, and the stable and reliable running of the compressor motor and the motor driving system is ensured.

The invention discloses an on-off control circuit for a 10kV motor, and belongs to the field of high-voltage motor control. The on-off control circuit comprises automatic air switches ZK, a microcomputer integrated protection device 1n, breakers QF, a control switch KK, a selection switch XK, intermediate relays ZJT and ZJH, indicator lamps, a selector switch QK and emergency stop buttons JA. The positive end of one automatic air switch ZK is connected with the terminal X1 of the microcomputer integrated protection device 1n, and the terminal X6 of the microcomputer integrated protection device 1n is connected with the negative end of the corresponding automatic air switch ZK to form a power source loop of the microcomputer integrated protection device 1n; the negative end of one automatic air switch ZK is connected with one end of the switching-on allowing signal lamp beside the motor, the other end of the automatic air switch ZK is connected with one end of a normally closed auxiliary contact of the corresponding breaker QF, and the other end of the normally closed auxiliary contact of the corresponding breaker QF is connected with a control contact of the selection switch XK to form a loop allowing the corresponding indication lamp to be turned on. Manual control and automatic control can be switched through the on-off control circuit.

The invention discloses a detection and calibration control method of travel distance and a location of a running mechanism, and belongs to the technical field of the electrical control. The method comprises the following steps: a, determining a positioning region of a running mechanism displacement encoder; b, determining a static magnetic grid positioning point and a static magnetic grid calibration point; c, demarcating a zero point location of the running mechanism corresponding to the displacement encoder, thereby obtaining a relation formula of a running mechanism location and a displacement encoder code value signal; performing primary calibration on the location of the displacement encoder detection when the static magnetic grid sensor passes through magnetic steel at a lower sidethereof; performing secondary calibration on the location of the displacement encoder detection when the static magnetic grid sensor passes through the next magnetic steel, thereby accomplishing the detection and calibration control of the travel distance and location of the running mechanism. The real-time dynamic calibration and precise control are performed on the running mechanism by adoptingthe double data of the displacement encoder combined with the static magnetic grid sensor, the detection precision and reliability are obviously improved, and the control method has the features of being convenient for operation and good in adaptability.

The invention discloses an excavator control system with an automatic early warning function. The excavator control system comprises intelligent mechanical equipment and a mobile terminal which are in both-way electric connection with each other, wherein the intelligent mechanical equipment comprises a controller; the input end of the controller is electrically connected with the output ends of a first feedback module, an amplifier and a parameter setting module; and the output end of the controller is electrically connected with the input end of a data acquisition module. The excavator control system has the advantages that through the connection between a wireless signal receiving-transmitting module I and a wireless signal receiving-transmitting module II, information detected by a sensor group can be transferred to the mobile terminal; an alarm is given by an alarming device II; a relay can be controlled by operating personnel through a switch module, and then an excavator is powered off and stops working; and the maintenance can be carried out timely. Therefore, the excavator control system can assist the operating personnel in quickly knowing the fault condition of the unmanned excavator, thereby avoiding the occurrence of a greater loss.

The invention discloses an intelligent frame-type strander break line stop apparatus. The apparatus comprises: a plurality of sensors, MCUs, a wireless sub-transmitter, a wireless receiving host. Quantities of the sensors are corresponding to the quantities of payoff reels of the frame-type strander. The sensors are used for detecting whether each payoff reel rotates or not and outputting pulse signals according to rotation states of each payoff reel. The quantities of the MCUs are corresponding to the quantities of the sensors. MCUs are used for postponing outputting the output pulse signals of the sensors. The wireless sub-transmitter comprises a wireless transmitting module, wherein signal output terminals of the MCUs are connected with the wireless transmitting module through a CAM bus. The wireless receiving host comprises a wireless receiving module. And the wireless receiving host is used to receive wireless sub-transmitter signals and output alarm and stop control signals. By using the invention, intelligent monitoring of working states of the frame-type strander can be achieved, and instant alarm and stop can be performed.

The invention provides an alarm system and method for a sealing-tape machine. The system comprises a determining device which determines a first dangerous region and a second dangerous region, the second dangerous region is contained in the first dangerous region, and the sealing-tape machine is located in the second dangerous region; the detection device is used for detecting the first dangerousarea and the second dangerous area so as to judge whether a person exists in the first dangerous area and the second dangerous area or not; the alarm device is arranged in the first dangerous area andgives an alarm when being started; and the control device is respectively connected with the detection device and the alarm device, controls the alarm device to be started when the detection device detects that a person is in the first dangerous area, and sends alarm information to the background monitoring center when the detection device detects that a person is in the second dangerous area. Danger grading can be performed on the area where the adhesive tape machine is located, grading alarm is performed according to the danger grading, the alarm reliability is improved, alarm prompting canbe performed in time when personnel enter the dangerous area, and the personnel safety is improved.

The invention relates to the technical field of vehicle control, and provides a method and device for controlling the fuel cell of a vehicle. The vehicle comprises a fuel cell and a power cell. The method comprises the following steps: detecting road condition information of a planned driving route of the vehicle; detecting the electric quantity of the power cell; and controlling the fuel cell to start or stop according to the road condition information and/or the electric quantity of the power cell. The electric energy of the power cell can be saved, and the service life of the fuel cell is prolonged.

The invention discloses a direct current brush motor stalling detection device and method. The device includes a direct current motor, a moving part and a detection module; the detection module includes a control chip, a motor driving chip, an ADC conversion module and a resistance network; the control chip is connected to the direct current motor through the motor driving chip; the direct currentmotor is connected to the moving part; the control chip is connected to the resistance network through the ADC conversion module; and the motor driving chip is connected to the resistance network. The device and method are simple in structural principle; fast detection can be performed when the stalling of the motor occurs; and the motor can be controlled to stop or brake, so that the motor can be prevented from continuously stalling to generate faults such as structural stuck and damages.

The invention discloses an engine-driven generator and a control method and system thereof. The control method comprises the following steps that the current CO concentration is obtained, the CO concentration increasing rate is obtained, a target concentration threshold value is determined, and an engine of the engine-driven generator is controlled to stop running when the current CO concentration reaches the target concentration threshold value; wherein the preset increase rate range is divided into at least two reference intervals, each reference interval corresponds to a preset concentration threshold value, the preset concentration threshold value is in negative correlation with a median value of the reference intervals, and the target concentration threshold value is the preset concentration threshold value corresponding to the reference interval where the CO concentration increasing rate is located. According to the control method, the appropriate target concentration threshold value can be determined according to the CO concentration increasing rate, so that the engine is controlled to stop in advance or in a delayed manner, the purpose of preventing the CO concentration from exceeding the standard is achieved, and the safety of a user is improved.

The invention discloses an intelligent sensing pressure tester, which includes a motor, a main body of the tester, and a test platform, and is characterized in that it also includes: a measuring head for applying pressure controlled by the motor, an amplifier and a PLC, the measuring head and the The main body of the tester is connected and located above the test platform. There is a force sensor inside the above-mentioned measuring head. The above-mentioned force sensor collects the force signal in real time and transmits the signal to the amplifier connected to it. The above-mentioned amplifier feeds back the signal to the PLC. The above-mentioned PLC is connected to the motor and Control the motor to run or stop according to the feedback signal. The benefits are: 1. It can reliably judge when the screen is damaged and control the shutdown of the pressure tester; 2. Record the pressure when the screen is damaged, and at the same time record the withstand voltage times of the screen under a certain pressure.

The invention discloses an aluminum oxide belt conveying system. The aluminum oxide belt conveying system comprises a controller, a belt conveyor, a material beating indication lamp, a roller detection switch, a conveying belt off-tracking treatment device, a pull rope switch and a door limiter switch, wherein the belt conveyor, the material beating indication lamp, the roller detection switch, the conveying belt off-tracking treatment device, the pull rope switch and the door limiter switch are connected with the controller. The material beating indication lamp is mounted on an aluminum oxidewarehouse material beating platform. The roller detection switch is arranged on a roller bearing seat and matched with the outer diameter of a roller. The conveying belt off-tracking treatment deviceand the pull rope switch are arranged in the conveying direction of the belt conveyor. The door limiter switch is arranged at an inlet of a maintenance platform of the belt conveyor. When the belt conveyor operates normally, if the controller receives one or more of a shaft rupture signal of the roller detection switch, an off-tracking signal of the conveying belt off-tracking treatment device, an actuating signal of the pull rope switch and a door closing signal of the door limiter switch, the belt conveyor is controlled to stop and the material beating indication lamp is controlled to be off, so that the site emergency stop occurring when an accident is caused is achieved; and the aluminum oxide belt conveying system is high in automation degree and safety. The invention further discloses an aluminum oxide belt conveying method.

The invention discloses a semiconductor wafer detection device and method and a wafer cleaning system, relates to the technical field of semiconductor equipment, and aims to solve the problems of wafer pollution and equipment shutdown caused by the fact that wafer damage is not detected in time in the wafer cleaning process. The semiconductor wafer detection device comprises an automatic clamping mechanism; the image sensor is arranged on the automatic clamping mechanism, and the controller communicates with the image sensor. The semiconductor wafer detection method comprises the following steps: receiving a wafer image transmitted by the image sensor, and controlling the wafer cleaning equipment to stop under the condition of determining that the wafer is damaged according to the wafer image and a wafer initial image. The semiconductor wafer detection device provided by the invention is used for detecting the wafer damage state in a semiconductor cleaning process and preventing the influence of wafer damage on productivity.