196results about How to "Avoid frequent startup" patented technology

The invention discloses a power following control method and system of an extended-range full electric vehicle. The power following control method comprises the steps that firstly, whether an auxiliary power unit (APU) is turned on or turned off is judged according to a power battery residual capacity value SOC and a full vehicle power demand P<demand>, when the APU is turned on, the generated power P<APU> and an optimum operation working condition point of the APU are further judged, the APU is controlled to work under the generated power P<APU>, when the generated power of the APU follows the full vehicle power demand, power generation of the APU meets the requirements of a driving motor, a power battery is effectively prevented from high-power discharging, and improvement of the servicelife of the power battery is facilitated; and when the power generation of the APU is at the optimum working condition point, the driving motor is supplied with power, the power battery is charged, the full vehicle energy consumption is reduced, and discharging of an engine is optimized. According to the power following control system, the power following control method of the extended-range fullelectric vehicle is adopted, and the problems that in a traditional power following mode, the fuel consumption and discharging of the engine cannot achieve an optimum condition, and the engine frequently starts are solved.

The invention discloses a co-rectifier transformer medium voltage type regenerative braking energy feedback device and a control method thereof; the feedback device comprises a rectifier transformer,an energy feedback unit, and a rectifier unit; a grid connected switch and an isolation transformer are respectively connected in series between the energy feedback unit and a rectifier transformer valve side winding; the energy feedback unit comprises two inverters; DC sides of the two inverters are provided with a single-knife-double-end isolation switch block; the DC sides of the two invertersare connected with a DC traction network through the single-knife-double-end isolation switch block; the feedback device control method comprises the following steps: starting, running and stopping the energy feedback unit according to a first startup threshold value, a second startup threshold value, an overvoltage protection value, a stop threshold value and a current gradient determination value. The feedback device can eliminate the circulation between the energy feedback unit and the rectifier unit, has a larger feedback capacity than a low voltage feedback device, has a simplified structure when compared with a conventional medium voltage feedback device, and uses less general assembly dimensions and land occupation areas, thus reducing cost, and providing good versatility.

The invention relates to a test device and a method for various types of oil pumps, and particularly discloses a sealing type test device and a method applicable to various types of oil pumps. The test method concretely comprises the following steps of: (1) setting the step length of the initial value of the inlet pressure value Gs of the oil pumps to be tested and the gradual decrease Gs value according to the oil pump work points; (2) setting the upper and lower limit values of each step Gs through a visual interface of the monitoring software in a host computer; (3) setting the upper and lower limit values of the test media temperature T through the visual interface of the monitoring software in the host computer; (4) obtaining a net positive suction head calculation formula through deduction and simplification; and (5) gradually decreasing the Gs value according to the step length and finely regulating a throttle valve to enable the oil pump full pressure to be stabilized to the test point pressure value. The test device and the method have the advantages that the sealed space pressure regulation range is large, the pressure of the sealed space can be fast, stably and highly reliably regulated, in addition, the environment is protected, and the tested data are accurate.

The car air conditioner evaporator defroster includes compressor, condensator, liquid storage, electronic expanding valve, evaporator blower, evaporator, evaporator outlet temperature sensor, evaporator inlet temperature sensor, A/D converter, program memory, drive circuit for electronic expanding valve and microprocessor. The throttle mechanism adopts electronic expansion valve. When the evaporator has surface temperature lower than the set temperature, the microprocessor will send command to increase the number of pulse to the electronic expanding valve for increased opening, raised evaporation pressure and raised evaporator surface temperature and the frost will thaw without stopping the air conditioner. The present invention can avoid the frequent start of the compressor, and this reduces power consumption, raises system stability and facilitates the intelligent control of the air conditioner.

The invention relates to an optimum determining method of power steering torque of electric power steering system of vehicle. At first, the torque of the starting power-steered steering wheel can be determined; the torques of the starting power-steered steering wheel in different speed intervals are set: T0(v0) is equal to plus or minus 1Nm; T1 (v1) is equal to plus or minus 1.5Nm; and T2(v2) is equal to plus or minus 2Nm. Secondly, the coefficient of proportionality of the starting steering power of a motor V (Vi) (i is equal to 0,1 and 2) is determined, according to the operation of the vehicle (idle load of vehicle and relevant parameters of vehicle) and the effects of steering power. Thirdly, the maximum power steering torque of the motor is determined; and the torque Tdtest of the rotary steering wheel of the vehicle requiring an EPS system is measured in the state of maximum load and the stationary state. Fourthly, the coefficient (M/m).V(Vi) of the actual steering power is regulated according to the vehicle load, speed and requirements for the steering system. Fifthly, the optimum power steering current of the motor of the EPS system is determined, according to the whole weight M, the running speed V, the torque Td and the parameters of the steering system of the vehicle under the actual running condition.

The invention discloses a high-voltage direct current power transmission line protection method based on wavelet transformation and energy spectrum analysis. According to the method, a starting criterion is formed through setting a threshold value on the voltage fluctuation, the frequent starting of a protection device caused by system voltage non-fault fluctuation is prevented, and in addition, the reliable starting can be realized when a direct current power transmission line fails; a fault voltage traveling-wave head wavelet transformation metatype maximum value polarity comparison method is utilized for distinguishing in-area and out-area faults; the energy distribution features of transient voltage in different frequency bands are utilized for distinguishing the fault and the lightning stroke interference, and meanwhile, fault poles and perfect poles of a double-pole system are identified.

The invention provides an overcurrent protection method and an overcurrent protection system of a liquid crystal display panel. The method comprises steps of carrying out current sampling for many times on driving current output by a power supply management chip according to a fixed sampling period in an overcurrent protection period so as to acquire multiple current sampling values; by accumulating difference values of the current sampling values and a preset overcurrent threshold so as to obtain an accumulated overcurrent value; judging whether the accumulated overcurrent value exceeds a preset accumulated overcurrent threshold; and starting overcurrent protection when the accumulated overcurrent value exceeds the preset accumulated overcurrent threshold. According to the invention, accuracy and timeliness of overcurrent judgment can be improved; and under the precise that the liquid crystal display panel is effectively protected, the OCP is prevented from frequently being started.

The invention provides an umbrella fabric dyeing and finishing machine, and belongs to the technical field of machinery. The machine solves the problem that existing dyeing and finishing machines are hard to use. The umbrella fabric dyeing and finishing machine comprises a rack and a fabric feeding roller, a dyeing chamber, an ironing chamber and a cloth roller which are all arranged on the rack. A dye tank is arrange at a side of the sack, support plates are arranged in the dyeing chamber, the support plates are two plates wherein a dyeing zone is formed between the two plates, sprayers are arranged at two opposite sides of the two support plates, each support plate is provided with a plurality of the sprayers wherein the sprayer distribution direction is perpendicular to the fabric delivery direction, a strip-like flow channel is arranged on each support plate while the sprayers are communicated with the flow channel, a dye delivery pump is arranged in the dyeing chamber, the inlet of the dye delivery pump is communicated with the dye tank through a pipe, and one end of each flow channel is closed while the other end is open, wherein the open end of each flow channel is communicated with the outlet of the dye delivery pump through a telescopic connecting piece. The dyeing and finishing machine further comprises two elevator mechanisms which can separately drive the up-and-down movement of the two support plates. The machine has the advantage of easy utilization.

The invention discloses a control device for an electric steam generator. The control device comprises a central controller, a digital display, a water level sensor, a temperature sensor, a pressure switch, water supplementing control, heating control and a safety protection system. The water level sensor and the temperature sensor are installed in a boiler, and water level and temperature signals in the boiler are collected respectively. The central controller controls a water supplementing and heating system to work. The safety protection system is composed of a pressure switch, a pressure release valve, a warner and a central controller safety control module. The central controller can set a steam temperature range and control a heater to be on or off, and accordingly the generation of constant-temperature steam is automatically controlled. When the temperature is higher than a set warning temperature, the central controller performs control to stop heating and give an alarm. When a safety switch set value is exceeded, the heater is further disconnected; and when a safety valve set threshold is exceeded, pressure starts to be released. The digital display displays steam temperature and pressure.

The invention provides a water heater and a hot water supply method. The water heater comprises a heat pump heating system and an electric heating system; the electric heating system comprises a water storage tank and an electric heater arranged in the water storage tank; water heated by the heat pump heating system is supplied to the water storage tank; according to the electric heating system, the electric heater further heats the water in the water storage tank to the first preset temperature so that the water can be supplied to a water outlet pipeline of the water heater when the water heater supplies the water to the exterior. According to the scheme, because the electric heater heats the water output by the water storage tank to the temperature higher than the water outlet temperature of the heat pump heating system, the supply time of the hot water can be prolonged, and the size of the water storage tank can be reduced. In addition, the heat pump heating system and the electric heating system are adopted for cooperative work, the water supply ratio of the heat pump heating system and the electric heating system is adjusted timely, the operating state of the heat pump heating system is adjusted timely, and therefore the temperature of the water supplied to the exterior can keep stable.

The invention provides a heat pump unit variable temperature heating water temperature control method and device, and particularly relates to the heat pump unit water temperature control method for heating of heating radiators and the control device for implementing the control method. A hot water concentrated heating system using a heat pump and a control method of the hot water concentrated heating system using the heat pump are adopted in the water temperature control method and device. The method comprises the following steps that an indoor temperature and an indoor temperature set value are acquired; the temperature control set value of a water outlet of a three-way thermostatic valve is adjusted according to the difference of the indoor temperature and the indoor temperature set value Ts; the temperature control set value of the water outlet of the three-way thermostatic valve is adjusted step by step according to the preset temperature range and the temperature rising or dropping speed based on the temperature difference; and meanwhile the stop water temperature set value of a compressor is synchronously adjusted to enable the water temperature of intermediate temperature water and the water temperature of the outlet of the three-way thermostatic valve to be equal, and variable temperature heating water temperature control is achieved. According to the heat pump unit variable temperature heating water temperature control method and device, high-temperature hot water can be produced only by using single stage compression and common environment-friendly refrigerant, while the requirement for high and low heating load variation is met, the function of energy storage is achieved when a large amount of heat energy is not needed indoors, and the effects of peak clipping and valley filling are achieved.

The invention relates to a marine air conditioner liquid supplying control system. The marine air conditioner liquid supplying control system comprises a compressor alternating current contactor and a liquid supplying solenoid valve which are connected to a control power source in parallel. A power-off delay time relay switch is connected to a parallel branch of the compressor alternating current contactor in series. An air conditioner temperature controller is connected to a parallel branch of the liquid supplying solenoid valve in series. A power-on delay time relay and a power-off delay time relay are connected to the liquid supplying solenoid valve in parallel. A compressor alternating current contactor switch is connected to the parallel branch of the liquid supplying solenoid valve in series. A power-on delay time relay switch is connected to a parallel branch of the power-off delay time relay in series. The marine air conditioner liquid supplying control system is simple in structure and reasonable in control, the liquid impact and low-pressure parking problems caused by frequent starting of a compressor can be effectively solved, the using performance of the compressor can be ensured, and the service life of the compressor can be prolonged.

The invention disclose a vacuum boosting system, which comprises a vacuum booster (1), a vacuum degree sensor (2), an electric vacuum pump (3), a control unit (4) and a vacuum tank (10), wherein the vacuum degree sensor (2) is arranged on the vacuum booster (1), and is used for acquiring the vacuum degree in the vacuum booster (1); the control unit (4) is electrically connected with the vacuum degree sensor (2) and the electric vacuum pump (3) respectively; the electric vacuum pump (3) is connected with the vacuum booster (1) and the vacuum tank (1) through pipelines respectively; the vacuum tank (10) is communicated with the vacuum booster (1). Moreover, the invention further provides an electric vehicle comprising the vacuum boosting system, and a corresponding vacuum boosting control method. By adopting the vacuum boosting system, the electric vacuum pump can be prevented from being started frequently, and the service life of the electrically-controlled vacuum pump is prolonged remarkably.

The invention relates to an intelligent hot water circulation system. The system comprises a heating and hot water dual-purpose gas furnace and a hot water circulation device; the dual-purpose gas furnace is provided with a heat supply outlet, a heat supply returning opening, a low-temperature inlet and a high-temperature outlet, wherein the heat supply outlet, the heat supply returning opening, the low-temperature inlet and the high-temperature outlet form heating circulation with a heat supply pipeline, the hot water circulation device internally comprises a water tank and is provided with alow-temperature inlet, a circulation outlet, a circulation inlet, a circulation water returning opening and a high-temperature outlet, the water tank is provided with a circulation opening, a water outlet and a cold water opening and is provided with an electric heating device and a water tank temperature sensor, the water outlet of the water tank passes through an electric three-way valve and isconnected with a water point through a hot water pipe, and the hot water pipe close to the water point is branched into a water returning pipe; signal output ends of a water tank temperature sensor,a pipeline temperature sensor and a flow sensor are connected with corresponding signal input ends of intelligent control devices in a control circuit, and corresponding control output ends of the intelligent control devices are connected with controlled ends of an electric three-way valve, a circulation pump and an electric heating deice. Heating after opening is achieved, and the phenomenon of frequent machine starting and stopping and heating breaking caused by short-time drainage can be effectively avoided.

The invention relates to a single-refrigeration water-source heat pump grain cooling unit, which comprises a unit case. The unit is characterized in that an air mixing box is mounted at the front end of the unit case; an return air connecting pipe is mounted at a first inlet end of the air mixing case; a second inlet end of the air mixing box serves as a fresh air inlet end; a filter is mounted at an outlet end of the air mixing box; the coarse filter is connected with an inlet end of a cooler; an outlet end of the cooler is connected with an inlet end of an air collecting pipe; an outlet end of the air collecting pipe is connected with an inlet of a fan; an outlet of the fan is connected with an air supply connecting pipe and port; a refrigerating system is mounted at the back end of the unit case and comprises a compressor and a water-cooled condenser; the water-cooled condenser is provided with a water inlet interface and a water outlet interface; and a refrigerant outlet of the cooler is connected with an inlet of the compressor; an outlet of the condenser is connected with an inlet of the water-cooled condenser; and a refrigerant outlet of the water-cooled condenser is connected with a refrigerant inlet of the cooler. The single-refrigeration water-source heat pump grain cooling unit is energy-saving and efficient and stable in operation, and has the beneficial effects that the cost is lowered, continuous operation can be achieved, and the service efficiency is improved.

The invention provides an energy conservation optimization control method for a pump station. The liquid level difference E, the liquid level change rate EC and the pump starting number U are graded and classified; the membership table between the gear and the class number of the liquid level difference E is established according to the gauss function, and a state table for the gear of the liquid level difference E, the gear of the pump starting number U and the liquid level change rate EC is set; a control relation table among the classification of the liquid level difference E, the classification of the liquid level change rate EC and the classification of the pump starting number U is obtained through calculation of a weighted average method according to the membership table and the state table; and the relation table is controlled correspondingly according to a formula, the class number of the pump starting number U is obtained, afterwards the number of pumps needing to be started is obtained, and the pumps are started. The invention further provides an energy conservation optimization control system, and intelligent energy conservation optimization control over the pump station is achieved.

The invention relates to an instantly-heating circulatory system suitable for a water heater and a control method thereof. The system and method solve the problems that in the prior art, a water heater in a heat circulatory system is frequently started, and hot water is prone to flowing into a cold water pipe. According to the technical scheme, a circulation device and a one-way valve assembly areincluded, the circulation device is mounted on a cold water pipe or a hot water pipe connected to the water heater, the one-way valve assembly is arranged at the tail end of the hot water pipe of thewater heater, a control module, a heating module in signal connection with the control module and a variable frequency water pump are arranged in the circulation device, the one-way valve assembly isprovided with a first temperature sensor, and the first temperature sensor is in signal connection with the control module. The instantly-heating circulatory system has the beneficial effect that thevariable frequency water pump and the heating module in the circulation device, a flow sensor, a second temperature sensor, the control module and the first temperature sensor on the one-way valve assembly form a closed-loop control system, and the problems that the water heater is frequently started, and hot water and cold water mixing in pipes is prone to happening are solved.

The invention relates to an instant heating circulation system suitable for a water heater and a control method of the instant heating circulation system, and solves the problems that a water heater is frequently started, and hot water flows into a cold water pipe and the like in the prior art. According to the technical scheme, the system comprises a pipeline, a circulating water pump, a circulating water pump and a flow detecting element, the pipeline is connected with the water heater, and the pipeline comprises a cold water pipeline or a hot water pipeline; the circulating water pump is arranged on the pipeline; the temperature control valve element is connected to the hot water pipeline and the cold water pipeline; the flow detecting element is installed in the pipeline and is in signal connection with the circulating water pump; the temperature control valve element is a self-operated temperature control stop valve. The instant heating circulation system has the advantages that hot water in the hot water pipe is prevented from being flow into the cold water pipe through the self-operated temperature control stop valve; the flow detecting element is used for detecting whethera circulation pipeline formed by the cold water pipeline and the hot water pipeline is smooth or not, and invalid operation of the circulating water pump is avoided; the self-operated temperature control stop valve and a one-way valve mounted at the cold water end is used for ensuring the stop valve can be opened and closed through the temperature of the tail end of the hot water pipeline in realtime, frequent starting of the water heater is avoided.

The invention discloses a low power consumption design method for a wireless sensor network node. A detection method comprises the steps of carrying out optimization processing on four time periods in a signal receiving and processing procedure of the wireless sensor network node, namely a wireless awakening time period, a wireless receiving time period, a data format judgment time period and a physical layer processing time period, and shortening the waiting times of the stages according to the sequence of start times to achieve a low power consumption effect. An implementation method comprises the steps of identifying and judging a data preamble, judging a carrier field strength indication RSSI threshold, judging a frame format to start according to the time periods, and finally transmitting valid data to an MCU for processing. By adopting the method disclosed by the invention, the interference of invalid data can be avoided, the implementation is simple, the low power consumption effect is good, the integrity of the data is guaranteed, and the life cycle of the wireless node is greatly prolonged.

The invention relates to the technical field of grinding materials, grinding tools and grinding wheels, particularly to a full-automatic rotary multi-station grinding wheel forming machine which comprises lifting conveying mechanisms, pushing and scraping mechanisms, a constant-volume adjusting mechanism, a worktable transmission power mechanism, a compression forming mechanism, a demoulding ejection mechanism, a mould mounting frame and a numerical control unit, wherein a plurality of mould cavities are uniformly distributed on the mould mounting frame in a circumferential direction; each mould cavity correspond to one station, and the mould cavities correspond to a primary scraping station, a screen piece placing station, a secondary scraping station, a core ring placing station, a compression station and a demoulding station in sequence; and any one of the six stations is controlled to open or close according to needs. According to the full-automatic rotary multi-station grinding wheel forming machine, feeding, pushing and scraping, adjusting, compression and finished product ejection are all completed automatically, so that the equipment reliability and the degree of automation are greatly improved, and meanwhile the labor intensity of workers is lowered; and owing to automatic production the production efficiency, the product quality and the product conformity are all improved remarkably.