150 results about "Intermittent control" patented technology

Separate forward dedicated and shared control channels are provided in a spread-spectrum communication. The forward dedicated control channel is used to communicate persistent control information and point to the shared control channel when further intermittent control information concerning transmission of data to a mobile station needs to be communicated. The use of a dedicated control channel for only necessary persistent control information, while only pointing to a shared control channel when it is needed, affords more efficient utilization of system resources.

The invention discloses a control circuit for a voltage dropping type power factor corrector, which is used for controlling a voltage dropping converter to realize the power factor correction function. Inductance current critical intermittent control of changed on-time is performed on a Buck circuit through the control circuit to ensure that the on-time of a switching tube rises in the power frequency period along with increase of input voltage; and the critical intermittent working mode of inductance current in the Buck circuit is controlled, and when the inductance current is greater than zero, the junction capacitance of the switching tube and inductance are resonated, and the switching tube is connected when the voltage resonance of the junction capacitance reaches the volley bottom. The control circuit for the voltage dropping type power factor corrector has the characteristics of ensuring high power factors in the whole input voltage range, and meeting the harmonic requirements of IEC 61000-3-2 Class C, Class D, along with high efficiency.

The invention discloses a method of monitoring faults in sections for an intermittent control system and relates to a fault monitoring method. Firstly, a plurality of batches of collected intermittent process data are standardized in a way of expanding variables, and a data matrix on each sampling time is subjected to principal component analysis; secondly, a fuzzy C-means clustering is a fuzzy clustering analysis method which is suitable for soft partition and is generated through combining a fuzzy set theory and a k-means clustering; and thirdly, after segmentation is finished, an improved MPCA (Multiway Principal Component Analysis) model with a time varying principal element covariance on the basis of expanding variables is established on each subphase, then when on-line monitoring is carried out, which phase a new batch of data belongs to is judged, whether the data exceeds the fault monitoring control limit or not is calculated and judged, if so, a fault occurs, and the fault monitoring in sections ends. According to the invention, process multi-phase partition is more accurate, misinformation and missing report rates in monitoring are reduced, and the practical application and operability are strong.

The invention belongs to the field of oil and gas safety engineering and particularly relates to a device and a method for detecting the combustible gas leakage. The method belongs to a new method for realizing the fuel gas on-line detection and positioning in China, has the advantage of intermittent controllability and can also be used in process systems for gas taking detection and analysis on other gas. Through the arrangement of a first electromagnetic vacuum valve, a second electromagnetic vacuum valve, an automatic control proportion valve, a combustible gas detector and a gas pressure sensor, the goals of stable pressure in a continuous or intermittent control container and the combustible gas leakage detection are effectively realized. The device and the method have the advantages that the operation is convenient, the structure is simple, and the problems in two aspects including the on-line detection of the combustible gas and the stable pressure in a negative pressure container are mainly solved, and simultaneously, an automation control interface is also reserved for providing the possibility for the system full automation realization.

The invention relates to a vehicle body controller and a control method thereof. The vehicle body controller integrates a windscreen wiper intermittent controller, a remote-control door lock controller and a turn light controller which are originally independently controlled into a whole for uniform control by adopting an integral control mode so as to not only save the installation structure of the controller, but also decrease chips of an internal control circuit. The vehicle body controller realizes windscreen wiper intermittent control, remote-control door lock and central-control door lock control and turn light control and increases the functions of collision unlocking, traveling vehicle automatic locking, claxon anti-theft alarm, and the like on the basis. The vehicle body controller internally comprises a main controller module, a power supply processing circuit, a signal processing circuit, a central-control lock driving module, a turn light driving module, a windscreen wiper intermittent driving module and a claxon driving module. The control method can overcome the defect of high fault rate of an independent control unit and also reduces the integral vehicle cost.

The invention provides a motor controlling device of electrical fishing line reel capable of not reducing the performance of the fishing line reel and preventing the motor being burnout, comprising a brake unit (90), a winding reel sensor (102) detecting the rotating speed of the winding reel; a current detecting portion (108a) for detecting the load of the winding reel by current value; an adjusting rod (101); the rotating speed of the winding reel is divided into high and low grades; the adjusting rod sets the speed upper limit value of each grade; a fishing line reel controlling potion (100) for controlling the speed of the motor such that the rotating speed of the winding reel is accordant with the set speed upper limit value; when the state of the motor current is over the first current value, maintaining the first set time; and when the speed of the winding reel reduces less than the first speed, the first motor controlling portion executes first intermittent control to the motor current to interrupt the motor current; the first motor current value is less than the maximum current value of the motor; the first speed is less than the speed upper limit value of the maximum speed grade.

A switching power supply device includes: a transformer that has a primary winding and a secondary winding; a switching element connected to the primary winding of the transformer; a control circuit that controls the switching element to be turned on/off in a case where a voltage is inputted to the primary winding of the transformer, and thereby induces a voltage in the secondary winding of the transformer; and a rectifying/smoothing circuit that rectifies and smoothes the voltage induced in the secondary winding of the transformer, and outputs the rectified and smoothed voltage to a load. The control circuit has: a current control unit that controls the switching element to prevent a current flowing through the switching element from being lowered to a fixed value or less in a case where the load is light; and an intermittent control unit that, in the case where the load is light, controls the switching element to perform an intermittent oscillation operation based on a feedback signal corresponding to an output voltage to the load.

In a cold-cathode dimmer, a current detector includes a LPF for removing the frequency component of a lighting/driving signal for a lighting driver from the output of a diode for rectifying the voltage across a current detecting resistor and passing the frequency component of an intermittent control signal for controlling the duty ratio of the lighting/driving signal. A luminance controller includes a current value computing section for producing, as a current average value, a multiplied result of a ratio of an interval during which the output level of the LPF is higher than a prescribed level to a period of the output of the LPF and the output level of the LPF during the interval during which it is higher than the prescribed level, and a duty controller for stabilizing a luminance of cold-cathode tubes at a target luminance in such a manner that the duty ratio of the intermittent control signal is set at a value corresponding to a difference between the current average value outputted from the current value computing section and a target value thereof.

When the amount of heat stored in a heat storage container is greater than or equal to a determination value at the time of initiation of system start-up in a hybrid vehicle, heating by thermal energy stored in the heat storage container is carried out only on an internal combustion engine. This increases the engine temperature to a permitting temperature for intermittent control of the engine or higher, so that the intermittent control is executed at an early stage after the initiation of the system start-up in the hybrid vehicle. Also, oil viscosity in the engine is rapidly lowered to decrease the resistance to operation of the engine. If the amount of the heat stored in the heat storage container is less than the determination value, the heating by the thermal energy stored in the heat storage container is performed on the transaxle under a prescribed condition. As a result, the fuel efficiency of the engine is improved.

The invention discloses an automobile front windscreen wiper interval-adjustable control system and an automobile front windscreen wiper interval-adjustable control method. The control system comprises an automobile body controller, a combined switch, a front windscreen wiper motor and an ABS (Anti-lock Brake System), wherein the automobile body controller is connected with the combined switch and the front windscreen wiper motor through wiring harnesses; the automobile body controller is connected with the ABS through a CAN (Controller Area Network) bus; the automobile body controller not only obtains a front windscreen wiper interval mode signal and a front windscreen interval time gear signal from the combined switch, but also obtains a real-time automobile speed signal from the ABS through the CAN bus; the automobile body controller adjusts the wiping interval time of front windscreen wipers driven by the front windscreen wiper motor according to the front windscreen wiper interval time gear signal and the automobile speed. By applying the control system and the control method, the stability of control on the interval time of the front windscreen wipers in the driving process of an automobile can be improved; the comfort of driving sight is bettered; meanwhile, the system cost is lowered to a certain extent.

The invention discloses an intermittent control method for eliminating static deviation of main steam pressure of a fossil fuel fired power unit, which includes the steps: monitoring the static deviation of the main steam pressure of the fossil fuel fired power unit in real time; and when the static deviation of the main steam pressure exceeds a specified value, making use of the step output characteristic of a derivative control module to adjust fuel quantity of a boiler based on an original boiler fuel quantity instruction by means of the intermittent rapid superposition of fuel quantity instruction offset corresponding to the static deviation of the main steam pressure, thereby eliminating the static deviation of the main steam pressure of the unit. By the method, the static deviation of the main steam pressure of the fossil power unit can be monitored in real time, and when the static deviation of the main steam pressure exceeds the specified value, the fuel quantity of the boiler can be adjusted timely by means of the intermittent rapid superposition of fuel quantity instruction offset corresponding to the static deviation of the main steam pressure, so that the static deviation of the main steam pressure of the unit can be eliminated quickly, and the precision of controlling the main steam pressure of the unit is improved effectively.

The invention provides a heavy haul train cruise control method based on periodic intermittent control. The heavy haul train cruise control method based on the periodic intermittent control comprises the steps that S1, a heavy haul train dynamic model which takes basic resistance parameter uncertainty into account is established; S2, a state feedback control law which exists under the condition of a periodic intermittent control framework is established; and S3, a periodic intermittent controller which exists under the condition of the input constraint is designed, specifically, a specific control method comprises the steps that S31, the running period T and the working time are set; S32, when the time is located in the working time interval, the control force u(t) is calculated through a linear matrix inequality and carried out in each subsystem to conduct control; S33, when the time is not located in the working time interval, the control is not applied at this moment; and S34, the step S32 and the step S33 are repeated until a system stops working.

A lighting device includes: a lighting unit which outputs a direct current; a smoothing unit having a capacitor which smoothes the direct current outputted from the lighting unit and supplies it; and a control unit for performing an intermittent control which alternately repeats a first time period in which the direct current is supplied to the smoothing unit and a second time period in which the direct current decreases to be smaller than that in the first time period. In the lighting device, a product of a frequency (Hz) and a capacitance (μF) of the capacitor is equal to or greater than 0.05 in which one cycle of the frequency corresponds to a sum of the first time period and the second time period.

An electromagnetic induction heating apparatus comprises: a resonance circuit that includes a inductor and a capacitor; a direct-current electric power supply; and a switching element performing ON and OFF switching of electric power supplied to the resonance circuit by the direct-current electric power supply; performs intermittent control of the electric power supply by controlling the ON and OFF switching at regular intervals, and by performing control to stop the electric power supply when not controlling the ON and OFF switching, wherein during the intermittent control, the switching control unit performs gradual control such that, upon beginning the control of the ON and OFF switching, the electric power supply gradually increases to reach a target value, and upon stopping the control of the ON and OFF switching, the electric power supply gradually decreases from the target value until stopping, such that the gradual decrease involves fewer steps than the gradual increase.

The invention discloses a method for controlling speed-limitation speed-stabilization current-limitation power generation of a wind driven generator. The method includes the steps that current detection and rotation speed detection are conducted on an output line of the wind driven generator through a processor; when the processor detects that the rotation speed of the wind driven generator reaches the set rotation speed, unloading parts are started to work through the processor, and the unloading quantity is modulated and controlled through a PWM pulse; when the processor detects that the input average current surpasses the set current and continues for a period of the set time, the unloading quantity is modulated and controlled by the processor through the PWM pulse, the wind driven generator is controlled to further operate at an uncontrolled speed so that the input average current of the wind driven generator can be reduced; when the processor detects continuous overcurrent of the input current, the processor gives out a command immediately, a brake is released to do motion, the wind driven generator is made to operate freely, so that the input current begins to be converted to charging current from unloading current, the processor conducts intermittent control over the brake of the wind driven generator or the unloading state, and thus operation of the wind driven generator can be kept in a non-overcurrent and non-overspeed state. The utilization rate of wind energy is increased, and the defect that the wind driven generator is prone to burning down is overcome.

The invention discloses a portable gas detection alarm device, and relates to a novel portable gas detection alarm device controlled by a singlechip. The portable gas detection alarm device disclosed by the invention is capable of collecting and displaying the current gas concentration value of an area in which the alarm device is located, making a corresponding alarm decision and effectively preventing safety accidents caused by gas combustion or explosion. The portable gas detection alarm device disclosed by the invention comprises the following functional modules: a microprocessor A Tme-gal 128 L, a sensor acquisition circuit, a signal amplification circuit, an intermittent control module and the like. The low-precision measurement mode of the intermittent power supply of a gas sensor is adopted, and the intermittent time is controlled by the singlechip; a direct voltage output signal which is in direct proportion to gas concentration and is generated by a detection bridge is sent to the analog/digital (A/D) conversion port of a microprocessor after being subsequently amplified to perform nonlinear compensation on a detected concentration value so as to accurately detect the true value of the current gas concentration.

The invention discloses an automated roller table conveying system and relates to the technical field of transporting equipment. The automated roller table conveying system comprises a steel pipe support, a roller table, a steel moving machine, a pipe puller, a pipe blocker and a PLC controller and is characterized in that sensors are arranged on the steel pipe support, the roller table, the steel moving machine, the pipe puller and the pipe blocker, and the sensors are connected with the PLC controller and used for detecting the positions of steel pipes and sending electric signals to the PLC controller; and the PLC controller is separately connected with the steel pipe support, the roller table, the steel moving machine, the pipe puller and the pipe blocker, is used for processing received electric signals and controls the roller table, the steel moving machine, the pipe puller and the pipe blocker. Through the cooperation of the PLC controller and the sensors, the automatic control and feedback of the conveying system are realized, the positions and states of the steel pipes can be monitored in real time, and operation safety and operation efficiency are ensured; and through the intermittent control of the PLC controller, a motor rotates and is switched between a work state and a stop state, the energy consumption of the motor is reduced, and the service life of the motor is prolonged.

The invention discloses a high-efficiency targeted purification method for an indoor local environment. The method comprises the steps that an electronic control moving device is fixed at the bottom of an air purifier, intermittent control is carried out over the electronic control moving device through a preset moving track on a main control module of the air purifier, the preset moving track of the main control module of the air purifier is a circulating moving track formed by sequentially connecting multiple fixed points into a line, the electronic control moving device is controlled by the main control module to move along the preset moving track and stayed at each fixed point, and the staying time of the electronic control moving device serves as the purification time of each time. Air purification can be carried out at different indoor positions through the method, circulating purification is conducted according to the preset moving track, the whole process is automated without manual operation, and use convenience is achieved; targeted purification can be carried out on the air at each position, purification efficiency is high, the speed is high, and the purification demands of various environments can be met.

An electric power tool is configured to control power supply to a motor based on an operational amount of the variable speed switch, and further configured to perform in an intermittent control mode in which power supply to the motor is varied intermittently in the same manner as if an ON operation and an OFF operation of the variable speed switch were repeated. It is also able to perform in a continuous control mode in which power supply to the motor is varied based on the operational amount of the variable speed switch.

The present invention provides a squamous seed bulb directional planter and a planting machine with the planter. The planter comprises a power input mechanism, an intermittent control mechanism, a seedling fetcher, a seedling box, a seedling containing box, a seedling bulb directional control pipe and a seedling charging component, wherein the seedling box, the seedling containing box, the seedling bulb directional control pipe and the seedling charging component are sequentially connected. The planter also comprises a shape-cavity component which is installed between the seedling charging component, wherein the shape-cavity component is provided with a shape-cavity head matched with the shape of shape-cavity. The intermittent control mechanism is connected with the shape-cavity component and the seedling charging component for controlling the shape-cavity component to move upwards and downwards to form a seedling cavity on the ground. Simultaneously the seedling charging component and the shape-cavity component are controlled to swing with a same speed so that the seedling charging component charges the seedling bulb into the formed seedling cavity. The planter and the planting machine with the planter can guarantee the accurate bunch planting of single grain of seedling bulb in the planting process.

A control method and a device for a power-transmission amplifier is used to generate a power control curve in a power variance region to control the power variance of signals to be transmitted when transmitting data in the continuous or adjacent first time slot and a second time slot, which have different modulation kinds with K1 of the first transmission value and K2 of the second transmission value separately. The concave intermittent control curve can control the power intensity of the amplifier to transfer from K1 to K2 to reduce the intensity of the power transmitted in the protected regions.