1195results about How to "High temperature control accuracy" patented technology

The invention discloses an air conditioner controlling method, a device and an air conditioner, wherein the air conditioner controlling method includes the steps of obtaining air conditioner operationenvironment parameters; determining the air conditioner target temperature according to the air conditioner operation environment parameters. The air conditioner operation environment parameters include indoor humidity, indoor temperature, outdoor temperature, set temperature, and electrical parameters of air conditioner system components. The air conditioner operation environment parameters include multiple parameters. The parameters that affect the temperature controlling of the air conditioner greatly can be taken into account; the temperature controlling precision of the air conditioner can be improved; according to the air conditioner operation environment parameters and according to the target temperature determined according to the environment parameters, closed-loop control can beconducted on air conditioner compressor frequency; adjusting temperature of the air-conditioner can be controlled more precisely; and high comfort and good user experience of the air conditioner canbe ensured.

A slow cooker comprises a case; a control circuit component and an inner pot for receiving food are disposed inside the case; the inner pot is arranged inside the case in a pick-and-place manner; a temperature detection component for temperature detection is arranged on the sidewall of the inner pot, and a mount seat connected to the case is arranged at the bottom of the inner pot; a liftable heating apparatus is arranged on the mount seat; the heating apparatus comprises a heating component and a lifting mechanism which can drive the heating component upwards and downwards. A temperature detection component arranged in the slow cooker is capable of detecting the temperature in the inner pot precisely; a lifting mechanism arranged in the slow cooker is capable of adjusting the distance from the inner pot to preheat the inner pot, improving cooking efficiency.

The invention provides a device and a method for measuring thermoelectric parameters of a film. The measuring device, which has a symmetric structure, comprises a radiating fin, a thermoelectric module, a heat insulation material, metal round rods, a thermocouple wire, a voltmeter, a power supply, a data acquisition instrument and a computer. The measuring method provided by the invention comprises the following steps of: clamping a film to be measured between two upper and lower metal round rods which are completely same while the area of the film sample is the same as the cross-sectional area of the metal round rods, controlling the ambient temperature of the measuring device and the heat flow of the film sample by the use of the thermoelectric module, detecting and recording each performance parameter of the film thermoelectric material at real time by the use of the data acquisition instrument. The invention has the following advantages: the performance of the film thermoelectric material at different temperatures can be measured, that is to say, the same device can be utilized to simultaneously measure the thermal conductivity coefficient, Seebeck coefficient and conductance coefficient of the film thermoelectric material so as to calculate ZT values of the film thermoelectric material at different temperatures. According to the invention, the measuring device has a simple principle, is convenient to operate, is small in size, has many test functions and has high measuring precision.

The weight reducer includes one section of elastic braid or elastic fabric, water bag and controller on the elastic braid or elastic fabric, semiconductor refrigerator fins arranged on the surface of the water bag, sponge filled in the intervals, one other section of elastic braid or elastic fabric to cover the sponge with hollow parts to expose the upper surface of the semiconductor refrigerator fins, and high strength and low heat resistance paint on the upper surface of the semiconductor refrigerator fins. The semiconductor refrigerator fins are connected parallelly and have their hot ends and cold ends connected to the controller and power supply. The present invention is used to stimulate body with alternate heat and cold to reduce weight via physiotherapy.

The invention relates to a temperature-controllable portable multifunctional pressure chamber, which is characterized in that a confining pressure chamber is connected with the oil source of an external confining pressure loading device by a confining-pressure oil inlet; an axial pressure chamber is connected with the oil source of an external axial pressure loading device by an axial pressure oil inlet; an axial pressure piston is arranged in the axial pressure chamber, and enters the confining pressure chamber after passing through the head cover of the confining pressure chamber; a sample cylinder is composed of a side wall, a base and an upper pressing board, wherein the base is provided with a porous disc, and samples are placed on the porous disc and then covered by a head cover; a spiral refrigerating-fluid circulating pipe winding the cavity of the confining pressure chamber and the base and the upper cover of the sample cylinder are internally carved twin-spiral refrigerating-fluid circulating slots respectively, and connected with an external refrigerating plant; temperature sensors arranged in the confining pressure chamber and on the base and the upper cover of the sample cylinder are respectively connected with an external temperature controller; the external temperature controller is connected with the external refrigerating plant, and the porous disc is connected with a water replenishing or drainage connector. The temperature-controllable portable multifunctional pressure chamber of the invention has the characteristics of accurate and independent multi-point temperature control and multifunction and is easy to carry, can be used with freeze thawing cycling testers, triaxial testers and CT scanners, and does not need to be performed installation and sample taking for many times and cause disturbances on samples, thereby simplifying the test process.

The invention relates to a resistance wire heating device for non-burning cigarettes. The device comprises an outer shell, an insulation jacket and a heater, a cigarette inlet allowing tobacco products to be inserted in is formed at the front end of the outer shell, the rear end of the outer shell is connected with an air inlet, the heater is arranged in the outer shell, and the insulation jacket is arranged between the heater and the outer shell. A resistance wire heating element is adopted as the heater and comprises a resistance wire and a ceramic heat-conducting sleeve, the resistance wire is arranged on the outer surface of the ceramic heat-conducting sleeve, a heating chamber for accommodating the tobacco products is arranged in the middle of the ceramic heat-conducting sleeve, the front end of the heating chamber is communicated with the cigarette inlet, and the rear end of the same is communicated with the air inlet. The resistance wire heating device has the advantages of high heat efficiency, constant-temperature heating, high temperature control precision, good stability and long service life.

The invention discloses a high-performance carbon fiber pre-oxidation furnace which is specially designed for carrying out heat treatment on a high-performance carbon fiber material at a temperature below 350 DEG C. A furnace body is designed into a building block structure and is convenient to assemble and disassemble. For the design of the furnace, the requirements of a preparation process of the high-performance carbon fiber material are fully considered and understood and the key special requirements of the preparation process of the high-performance carbon fiber material are met to the greatest extent. According to the requirements of the preparation process of the material, a circulating hot air heating mode is adopted for the pre-oxidation furnace; for a circulating air traveling mode, air is blown to two ends of the furnace body from the middle of the furnace body; and a plurality of heat treatment cavities are connected in series and in parallel to form a system with a certain temperature gradient. An anticorrosion stainless steel structure is adopted for an inner hearth totally; a full-fiber superlight material is adopted as a heat insulating material to carry out heat insulation; a PLC (Programmable Logic Controller) temperature control module is used for temperature control and has the characteristics of high temperature control accuracy, high temperature stability and the like; and according to the pre-oxidation furnace, in a pre-oxidation process, the problems of low heat treatment efficiency, inaccurate temperature control and unideal temperature uniformity in the heat treatment cavities are solved, protofilament combustion is prevented, sufficient supplementation of the oxygen content in the hearth is realized and waste gas is reasonably discharged. The integral high-performance carbon fiber pre-oxidation furnace has relatively low energy consumption and is durable.

The invention relates to a rolling device for preparing a high-toughness high-formability magnesium alloy sheet strip coil and belongs to the field of metal material rolling. The rolling device provided by the invention comprises a rolling machine, an uncoiling machine, a left-right recoiling machine, a front online heating insulating device of the roll machine, a rear online heating insulating device of the roll machine, a straightening machine, a bending rectifying machine, a thickness measuring device, a steering tension roll, a guide roll, a roller heating and lubricating device and the like. In the invention, an online continuous heating device and an advanced PLC (programmable logic control) feedback control system are adopted, and continuous temperature control rolling on the magnesium alloy strip coil is realized. The rolling device provided by the invention has the advantages of uniform heating temperature, high heating efficiency and high temperature control accuracy, and high-quality thin wrought magnesium alloy strip coils are efficiently produced by virtue of a roller preheating insulating system, a technical lubricating system, a strip shape control system and a tension straightening device, thus the geometric quality and structure properties of rolled metal can meet operating requirements.

The invention discloses a standard constant temperature bath touch screen intelligent measurement control and automatic metering detection system. By utilizing intelligentized program temperature control technology, a detecting temperature field with good uniformity and a small fluctuation degree is effectively provided, and intelligentized detection on various detected temperature instruments can be completed automatically, rapidly and efficiently. The detection system comprises a standard constant temperature bath, a touch screen and PLC intelligent temperature controller, a multi-path electric signal acquisition conditioning and converting device, a temperature comparator / counter, a data processing and monitoring unit, a multi-path picture signal acquisition device, an image identification and controller, an intelligent channel switching and controlling unit, a database management and reservoir, an intelligentized parameter control unit, and a record inquiring and certificate printing device. Temperature signals or indicating value images of detected temperature sensor and / or detected temperature instruments without temperature signal output are subjected to acquisition, identification, comparison and data processing treatments, a detection result is obtained finally, and a detection record and a detection report are formed.

The invention discloses a double-temperature control system for a passenger compartment and a power battery of a fuel cell vehicle. An output end of an electric compressor is connected to a port A ofa four-way reversing valve; a port B, a forecabin heat exchange module, a one-way valve parallel connection section, a refrigerant parallel connection section and a port C of the four-way reversing valve are sequentially connected in series; a port D of the four-way reversing valve, a gas-liquid separator and an input end of the electric compressor are sequentially connected in series; the refrigerant parallel connection section comprises a first refrigerant branch and a second refrigerant branch which are arranged in parallel, a cooling liquid outlet of a battery heat exchanger is connected to a cooling liquid inlet of a power battery system, and a cooling liquid outlet of the power battery system, an expansion water tank, a water pump and a cooling liquid inlet of the battery heat exchanger are sequentially connected in series. On the premise that the system is simplified, independent control over the passenger compartment temperature and the power battery temperature is achieved, abattery pack temperature and the battery cooling inlet temperature are adopted as power battery temperature adjusting parameters, the influence of thermal delay is avoided, and the temperature controlprecision of the power battery is improved.

The invention relates to a super-large trolley type gas heat treatment furnace. The gas heat treatment furnace is characterized in that a fixed rear wall of the conventional furnace body is changed into a movable rear wall, a steel member of the movable rear wall is fixed on a travelling mechanism, and a lining is arranged on the lateral surface of the steel member; and a sealing mechanism is arranged on each of the upper, lower, left and right parts of the movable rear wall, so that the movable rear wall, the lining of the furnace body and a trolley are sealed. Moreover, a furnace door dropping preventing device is added in a furnace door and a lifting mechanism and drives a safety pin by means of a reset force of a spring, once the furnace door drops due to loss of pull, the safety pin quickly extends out, and the furnace door is clamped on upright posts on two sides of the furnace door, so that the furnace door is prevented from continuously dropping. The using efficiency of the super-large heat treatment furnace is effectively improved; energy waste caused by ineffective combustion in the redundant space is avoided; the sealing mechanisms of the movable rear wall are reasonable in structure, easy and convenient to operate and convenient to maintain, and can achieve good sealing performance and increase the overall energy-saving effect of the heat treatment furnace; and thefurnace door dropping preventing device promotes the running safety of the furnace body.

The invention discloses a control method and device for an air conditioner as well as the air conditioner. The control method for the air conditioner comprises the steps as follows: air conditioner operation environment parameters are acquired; the air conditioner target temperature and the inner air blower rotating speed are determined according to the air conditioner operation environment parameters; and the frequency of a compressor is adjusted on the basis of the air conditioner operation environment parameters, the target temperature and the inner air blower rotating speed. The air conditioner operation environment parameters include multiple parameters, many parameters affecting air conditioner temperature control can be considered, the air conditioner temperature control precision can be improved, closed-loop control can be performed over the frequency of the compressor of the air conditioner according to the air conditioner operation environment parameters as well as the targettemperature and the inner air blower rotating speed which are determined according to the environment parameters, the temperature conditioned by the air conditioner can be controlled relatively precisely, and the relatively-high comfort of the air conditioner and the relatively-good user experience can be guaranteed.

Disclosed is a substrate processing method wherein the infrared absorptance or infrared transmittance of a substrate to be processed is measured in advance, and the substrate is processed according to the measured value while independently controlling temperatures at least in a first region located in the central part of the substrate and in a second region around the first region using temperature control means which are respectively provided for the first region and the second region and can be controlled independently from each other.

The invention provides a temperature control system for a high-gloss plastic mould without melted marks; the system comprises a temperature controller, a heating boiler, a cooling tower, a water tank, an air compressor and a control unit; the temperature controller is provided with a steam pipeline, a cooled water pipeline, a compressed air pipeline, a mixer, a module inlet pipeline and a module outlet pipeline; the heating boiler, the cooling tower and the air compressor are all connected with the temperature controller by pipelines; the module inlet pipeline and the module outlet pipeline in the temperature controller are connected with a module, in which temperature sensors are arranged; each temperature controller and each control valve are connected with the control unit by communications cables. The invention can heat or cool plastic modules according to each phase of the injection cycle, thereby having high control precision of the module temperature and wide heating and cooling scope of modules; the system can be used for getting plastic products with high-gloss surfaces, good performance and low production cost, but without melted marks, flow marks, and spraying processing.

The invention relates to a self-tuning PID energy-saving temperature control method. The method comprises the steps that a target temperature value, a control period, a sampling period and a thresholdtemperature difference are set first; load heating power is increased; the current regional temperature sampling value of a controlled object is acquired, and the sampling period is combined to calculate the temperature rise rate; a PSO-DE algorithm combining particle swarm optimization (PSO) and differential evolution (DE) is used to adjust and calculate PID control parameters; the duty cycle ofthe output pulse of a control period is adjusted according to the operation result; heating power output is adjusted, so that the sampled temperature sampling value is approximately equal to the actual temperature value of the controlled object; a temperature error caused by the heating inertia is reduced; heating power is accurately controlled; and the energy saving effect is obvious. A self-tuning PID energy-saving temperature control module comprises the self-tuning PID energy-saving temperature control method, can accurately control the heating power, and has an obvious energy-saving effect.

The invention discloses a system and a method for on-line control of a molten steel temperature in LF refining and belongs to the technical field of metallurgy production and control. The system comprises an information acquisition module, a heating judgement module, an electrode heating module, a steel ladle lining heat-dissipation module, an added alloy judgement module, an alloy heat effect module, an added slag judgement module, a slag heat effect module, an argon-blown slag layer judgement module, a molten steel thermal-radiation module, an argon heat-absorption module, a slag layer heat-radiation module, a temperature calculating module, a temperature correction judgement module, a temperature correction module, a temperature forecast module and a temperature control module. The method comprises calculating molten steel temperature variable quantity produced by heating and heat radiation cooling processes in LF refining to obtain a molten steel real-time temperature, controlling the heating process by adjustment of heating time so that the molten steel real-time temperature reaches a molten steel target temperature, and controlling the molten steel real-time temperature in an allowable accuracy range in the LF refining scene.

The invention discloses a rapid water heating device and a control method thereof. The rapid water heating device comprises a water tank shell, wherein the water tank shell is provided with a water inlet and a water outlet; the water tank shell is internally provided with a heating element; the heating element is connected with a heating control board; the part, which is adjacent to the water outlet, of the water tank shell is provided with an outlet water temperature sensor; the water outlet of the water tank shell is provided with a rectification cavity; a head induction point and a rod body of the outlet water temperature sensor are positioned in the rectification cavity; the distance between the outlet water temperature sensor and the heating element is 1-15mm. The part, which is adjacent to the water outlet, of the water tank body is provided with the rectification cavity and the installation position of the outlet water temperature sensor is controlled, so that an inlet water temperature sensor and a flowmeter are omitted, the device structure is simplified, and the inlet water temperature sensor and the flowmeter can be accurately estimated by use of the outlet water temperature sensor, the temperature control accuracy and the reaction rate are improved, and the rapid water heating device is stable and reliable in performance, long in service life and relatively good in compatibility.

The high-precision temperature control circuit for thermoelectric cooler (TEC) includes five parts: temperature setter for setting TEC work temperature and outputting the set temperature to PID controller; temperature collector comprising temperature sensor and exciter for collecting practical TEC temperature and outputting the temperature signal to PID controller; PID controller the set TEC temperature and the practical TEC temperature and producing differential TEC control signal to the PWM power driver; and PWM power driver producing PWM signal according to the TEC control signal and filtering the signal to provide DC output to the TEC. The present invention has high-precision and low-cost temperature control circuit in PWM mode, and has temperature control precision of 5 mK.

The invention discloses a high-temperature ultralow permeability measuring instrument. A triaxial pressure chamber is connected with a hydrostatic pressure loading pump, a bias pressure loading pump and a constant current / voltage control pump respectively, wherein the triaxial pressure chamber is arranged in a high-temperature control box, while the hydrostatic pressure loading pump, the bias pressure loading pump and the constant current / voltage control pump are placed outside the high-temperature control box. The triaxial pressure chamber comprises a base, an axial piston and an oil cylinder outer wall, wherein the axial piston penetrates through the top of the triaxial pressure chamber which is internally provided with two miniature pressurizing chambers; one pressurizing chamber is connected with a side pressure oil inlet through a self-balancing connecting pipe, the side pressure oil inlet passes through the oil cylinder outer wall and is connected with the hydrostatic pressure loading pump, and the other pressurizing chamber is connected with the bias pressure loading pump through an axial pressure oil inlet. The measuring instrument is simple in structure, convenient to use, high in measuring precision, capable of measuring the low permeability under the conditions of different temperature and stress, and very suitable for measuring the permeability of low-permeability rock-soil mediums involved by unconventional oil-gas fields, energy storage and nuclear waste underground storage engineering.

The invention discloses a natural gas hydrate sediment triaxial test device, and belongs to the field of testing the mechanical properties of natural gas hydrate sediment. The device comprises a triaxial test device main machine, a temperature control system, a pore pressure control system, a confining pressure control system and a computer data acquisition and control system. The triaxial test device main machine, which is in a dual-pressure-chamber structure, can be used for accurately measuring volume change in the sediment in a natural gas hydrate decomposing process; a load sensor is arranged inside the pressure chamber and is capable of improving the precision of intensity data; a pre-cooling hollow cavity is formed inside a base to pre-cool pore gas and pore water which enter a sample, so as to relieve the decomposition of the natural gas hydrate in a saturated water process and to improve the precision of temperature control; in a sample installation process, a quick coupling is adopted for connection, so that the operation is convenient and rapid. The device can simulate the natural gas hydrate decomposing process under mining conditions, so as to achieve the high-precision temperature control, and accurate measurement of intensity and volume change; and the device has great significances for understanding the mechanical properties of the natural gas hydrate sediment and assessing the stability of a reservoir.

The invention relates to a frequency converting control system and control method suitable for a central cooling system of a ship. Energy is saved. Three sea water pumps with 50% flow and the frequency conversion technology are adopted, only one sea water pump is used for frequency conversion operating under medium-low thermal loads, and two sea water pumps are used for frequency conversion operating under high thermal loads. Under the low thermal loads, the temperature of fresh water is controlled by adjusting the bypass amount of a temperature control valve. Under medium-high thermal loads, the temperature of the fresh water is controlled by adjusting the rotating speeds of the sea water pumps. Control precision on the temperature of the fresh water is high, and the response speed is high. Operation is easy, an operator only needs to start one sea water pump, and starting and stopping of the second sea water pump and adjustment of the bypass amount of the temperature control valve and the rotating speeds of the sea water pumps are all automatically completed through an electric cabinet. High reliability is achieved, adjustment of the bypass amount of the temperature control valve and adjustment of the rotating speeds of the sea water pumps are separately carried out, and no conflict is generated. When a frequency converter breaks down, the temperature control valve can be independently used for controlling the temperature of the fresh water. When the temperature control valve breaks down, the frequency converter can be independently used for controlling the temperature of the fresh water, and the temperature of the fresh water cannot be out of control.

The invention discloses an automatic constant-temperature water mixing valve. The water mixing valve comprises a valve body, a temperature sensing rod, a work spring, an adjusting screw rod and a tempering knob, wherein the valve body is provided with a hot water inlet, a cold water inlet and a mixed water outlet; the tempering knob is connected with the adjusting screw rod; a valve plug is arranged in the valve body; the middle part of the valve plug is movably matched with the inner wall of the valve body; the upper part of the valve plug is positioned at the inner end of the cold water inlet; the lower part of the valve plug is positioned at the inner end of the hot water inlet; the valve plug is provided with an axial through hole; the temperature sensing rod is fixedly connected to the lower part of the valve plug; the upper part of the temperature sensing rod is positioned in the cavity of the valve plug; a water mixing ring and the work spring are sleeved on the lower part of the temperature sensing rod; the lower end of the work spring is pressed against the inner wall of the valve body; the top rod of the adjusting strew rod can be pressed against the upper end of the temperature sensing rod; the valve body is in threaded connection with a large end cover; the adjusting strew rod is in threaded connection with the large end cover; the large end cover is also in threaded connection with a small end cover; and a buffer spring is arranged in the blind hole of the adjusting screw rod. The water mixing valve has the advantages of low water resistance and high reaction sensitivity.

The invention provides a supercritical steam oxidization test device, which is characterized by comprising a fluid control assembly; the fluid control assembly is connected to a water treatment assembly and a reaction container assembly through a pipeline respectively; the water treatment assembly is connected to the reaction container assembly through a pipeline; the fluid control assembly, the water treatment assembly and the reaction container assembly commonly form a medium circular flow loop; the reaction container assembly is arranged in a heating furnace; temperatures of the heating furnace and the reaction container assembly are controlled by a temperature control system; and the fluid control assembly and the temperature control system are monitored by a data monitoring assembly.The supercritical steam oxidization test device provided by the invention is a test device capable of simulating a high-temperature high-pressure steam environment of a (ultra) supercritical power station boiler and relates to a whole set of technical solution. The device has the advantages of being low in manufacture difficulty, high in economical efficiency, allaround in function, simple and convenient for operation, precise for control, safe and reliable and is applied to being widely popularized and used in laboratories and can satisfy requirements of scientific researches and engineeringtests.

The invention discloses a micro-fluidic chip and a detecting device suitable for PCR (polymerase chain reaction) or HRM (high resolution melting) detection analysis. A micro pipeline and an array reaction chamber base plate form a combined mould, a micro-fluidic base chip is generated by virtue of an injection molding method, the micro-fluidic chip is formed by virtue of plasma cleaning and glass bonding; a rotary rod with a handle and a duct is transversely embedded in an outward channel center of the chip to form a rotary valve; the handle rotates to disconnect the duct to control on-off and sealing of multi-reaction-chamber sampling, so that physical isolation between reaction chambers is realized, the sealing performance is good, and cross contamination does not exist, and thus, a plurality of samples can be detected at the same time. The micro-fluidic chip disclosed by the invention not only can be used for independent PCR detection or HRM detection, but also can be used for performing PCR detection and then performing HRM detection without any change in a combined manner, so that the multi-functionalization of detection is realized.

The invention discloses a fast constant temperature microreactor. The fast constant temperature microreactor comprises a sample cell and at least one sample inlet and outlet arranged on the top of the sample cell, wherein the bottom of the sample cell is provided with an inert slab or a microfluidic chip, the top of the sample cell is provided with an inert thin layer, and a sample cell wall formed by a seal cushion is arranged between the inert slab and the inert thin layer; heatconducting blocks and temperature sensors are arranged on the inert thin layer, and the temperature sensors are covered in the heatconducting blocks; temperature control elements are arranged on the heatconducting blocks, and radiating blocks are arranged on the temperature control elements; the side walls of the heatconducting blocks and the side walls of the temperature control elements are covered by insulating housings; and the sample inlet and outlet of the sample cell is communicated with the outside by pipelines. The microreactor has compact size, can be used as a sample cell for a surface plasma resonator, a resonance light scattering apparatus and other analytical instruments to realize the fast temperature change and the accurate constant temperature control of samples in controlled elements, and can meet the operating requirement of high accuracy measurement on temperature-sensing biological samples.

The invention relates to a control method of an air-conditioning system of an electric vehicle, aiming at providing a self-adaptive control method of the air-conditioning system of the electric vehicle by comprehensively considering the characteristics and the needs of a power supply system, a power system and the air-conditioning system of the electric vehicle. The input power of the air-conditioning system is matched with the consumed power of the power system to optimize the control and operation conditions of the air-conditioning system, so that not only is the power need of the power system met, but also the operation efficiency and the temperature control accuracy of the air-conditioning system are improved, and further the comfort and the energy-efficiency ratio of the air-conditioning system are improved. The self-adaptive control method is also beneficial to improving the continuous mileage of the electric vehicle.

The invention relates to a thermal process wireless virtual instruments integrating control system used in thermal process technology field. It includes virtual instrument host computer, host computer wireless communicator, a set of slave wireless communicator, a set of A / D converter, a set of input / digital converter, a set of D / A converter, and a set of digital / output converter. The host computer connects to the host wireless communicator. The main wireless communicator communicates with slave wireless communicator. The slave wireless communicator connects to A / D converter or input / digital converter or D / A converter or digital / output converter. The invention has the advantages of flexible, good adaptability, strong function, convenient to use, low cost, etc.

The invention discloses a diesel engine DPF active regeneration control method. The diesel engine DPF active regeneration control method comprises the following steps that the exhaust mass flow of anengine, the DOC inlet temperature and the air pressure difference between a DPF outlet and a DPF inlet are acquired, and whether the regeneration triggering condition at the moment is met or not is judged; when the regeneration triggering condition is met, the regeneration control is triggered, the initial oil injection quantity in the current state is calculated; an oil injection device is controlled to start to perform oil injection, and meanwhile, whether the DPF inlet temperature meets the set regeneration target temperature or not is detected; when the DPF inlet temperature meets the setregeneration target temperature, oil injection is carried out at the current oil injection quantity; when the DPF inlet temperature does not meet the set regeneration target temperature, the fuel oilinjection amount is regulated through a regeneration controller, so that a proper oil injection quantity is guaranteed to be regenerated, and meanwhile, whether the air pressure difference before andafter a DPF is reduced to a set lower limit value or not is detected; and when the regeneration end condition is met, oil injection is stopped, and the regeneration process is completed. According tothe diesel engine DPF active regeneration control method, parameters needing to be calibrated are few, the universality is high, the calculation fluctuation under a feed-forward oil quantity transientcondition is reduced, and the regeneration efficiency is improved.

Thermal management systems and methods related to controlling temperature of internal combustion engines are provided. In one embodiment, a thermal management system includes an air intake structure defining an air intake passage therethrough coupled to a plurality of cylinders in an engine, a multi-stage cooling assembly, positioned in the air intake passage, including an air-to-coolant intercooler for cooling intake air and an air-to-air heat exchanger for cooling intake air, an air-to-coolant radiator fluidly coupled with the air-to-coolant intercooler of the multi-stage cooling assembly, a first fan operable to provide air flow to the multi-stage cooling assembly and the air-to-coolant radiator, and a second fan operable to provide air flow to the air-to-coolant radiator.