67 results about "Heat current" patented technology

The invention belongs to the technical field of sheet welding deformation leveling, and discloses a construction method and a leveling method of a sheet leveling process parameter model, and the method comprises the following steps: M1, obtaining corresponding material attributes according to a sheet material needing to be leveled on site; m2, related data of the field welding process are known; m3, the initial leveling position, the heating time, the heating current and the heating frequency are obtained according to the material attributes and the welding process parameters of the thin plate; step M4, calculating the heat flux density of the Gaussian heat source model of the heating position according to the heating current, selecting the next heating position according to the heat flux density, and obtaining a heating sequence; and step M5, repeatedly executing the steps M3 to M4, and further correcting the heating time, the heating current and the heating frequency according to the actual temperature change data to obtain a final thin plate flattening process parameter model. According to the method, data of material attributes of an actual flattening heating workpiece and actual flattening working conditions are collected, and a multi-input and multi-output thin plate flattening process parameter model conforming to field working conditions is established.

The invention provides a data acquisition control method and device based on intelligent temperature control equipment, and relates to the technical field of intelligent control. The method comprises the following steps: acquiring a PID parameter correction model; the material M and the pipe diameter D of the heated pipe are obtained; the temperature # imgabs0 # and the heating current # imgabs1 # of the heated pipe are obtained according to the data acquisition device, and the temperature difference # imgabs4 # and the temperature difference change rate # imgabs5 # between the # imgabs2 # and the preset target temperature # imgabs3 # are determined; constructing a first state vector # imgabs10 # comprising M, D, # imgabs6 #, # imgabs7 #, # imgabs8 # and # imgabs9 #, and constructing a second state vector # imgabs10 # comprising M, D, # imgabs6 #, # imgabs7 #, # imgabs8 # and # imgabs9 #; inputting the # imgabs11 # into a PID (Proportion Integration Differentiation) parameter correction model to obtain an action strategy # imgabs15 # comprising a proportion increment adjustment amount # imgabs12 #, an integral increment adjustment amount # imgabs13 # and a differential increment adjustment amount # imgabs14 #; inputting # imgabs16 # into a fuzzy PID controller, and controlling the temperature of the heated pipe by the fuzzy PID controller according to # imgabs17 # current. The method is fast in pipe heating temperature rise and accurate in temperature control.

The present invention provides a system, a method and a storage medium for synchronously testing silicon carbide devices. The system includes: a selection module, a test switching module, a heating current switching module and a measurement current switching module; the selection module is used to install the device to be tested and obtain a detection signal after the installation is completed; the test switching module receives the detection signal and provides a startup voltage for the device according to the detection signal; the heating current switching module receives the detection signal and controls the corresponding relay to work according to the detection signal so as to enable the heating power supply circuit corresponding to each device to be turned on and supply a heating current to the device; the test switching module also receives a measurement signal and provides a measurement voltage for the device according to the measurement signal; the measurement current switching module receives the measurement signal and controls the corresponding output switch to work according to the measurement signal so as to enable the measurement power supply circuit corresponding to each device to be turned on and supply a measurement current to the device. This application can simultaneously test at least one type of device.

The application discloses an overload automatic switch strategy making method for a dedicated transformer terminal and relates to the technical field of automatic control of dedicated transformers. The overload automatic switch strategy making method adopts an overload judgment rule containing a judgment branch one and a judgment branch two. The judgment branch one identifies a conventional electrical overload based on an overload current multiple and an equivalent thermal current. The judgment branch two identifies an implicit temperature overload based on real-time temperature. The overload grade from a pre-warning grade to a short-circuit grade is determined in combination with a reverse time limit time, and a corresponding switch control strategy is matched. The method effectively avoids the defects that a single current judgment cannot reflect thermal inertia, distinguish false disturbances and cover implicit overloads. Through multi-dimensional coupling verification and hierarchical disposal, the method not only filters false actions caused by short-time impacts, but also accurately captures thermal accumulation overloads and temperature overloads, thereby guaranteeing power supply continuity while avoiding damage to equipment caused by overloads.

A control device includes: a print data acquisition unit configured to acquire print data, which is formed of a plurality of lines and indicates a coloration state of each pixel included in the plurality of lines; a head drive unit configured to supply, to a thermal head formed of a plurality of heating elements each corresponding to the pixel, an electric current for heating the thermal head for each pixel; a motor drive unit configured to supply, to a motor configured to move heat-sensitive paper relative to the thermal head, a drive current for step driving the motor for each line; a speed control unit configured to control, based on the number of colored pixels of a determination subject line among yet-to-be-printed lines of the print data, a relative moving speed of the heat-sensitive paper moved by the motor; and a preheating control unit configured to cause the head drive unit to output, when the determination subject line is a specific line being a line in which the number of colored pixels of the determination subject line exceeds a predetermined value, a preheating current being an electric current for heating the thermal head to such a degree as to prevent coloring of the heat-sensitive paper by a time the specific line is printed.

The invention relates to a method for operating a fuel cell system (100), in particular a vehicle (200), by means of a control unit (FCCU) comprising: - Providing (110), by the control unit (FCCU), a respective heating current (I i,k ) to a heater of a number (n) of heaters of the fuel cell system (100) in a second calculation step (k), wherein the heating currents (I i,k ) in total a total heating current (I ges,k ) result, - Forecast (120), by the control unit (FCCU), of the total heating current (I ges,k+1 ) for a third calculation step (k+1) following the second calculation step (k) depending on the total heating current (I ges,k ) of the second calculation step (k) and - Operation (130), by the control unit (FCCU), of the fuel cell system (100) depending on the total heating current (I ges,k+1 ) of the third calculation step (k+1). The invention further relates to a fuel cell system (100), a computer program product, a computer-readable data carrier, a control unit (FCCU) and a system (200).

The invention provides a system and a method for synchronously testing a silicon carbide device, and a storage medium. The system comprises a selection module, a test switching module, a heating current switching module and a measurement current switching module, the selection module is used for installing a device needing to be tested and acquiring a detection signal after installation is completed; the test switching module receives the detection signal and provides starting voltage for the device according to the detection signal; the heating current switching module receives the detection signal and controls a corresponding relay to work according to the detection signal so as to realize conduction of a heating power supply circuit corresponding to each device and supply heating current to the device; the test switching module also receives the measurement signal and provides a measurement voltage for the device according to the measurement signal; and the measurement current switching module receives the measurement signal and controls the corresponding output switch to work according to the measurement signal so as to realize conduction of the measurement power supply circuit corresponding to each device and supply measurement current to the device. According to the invention, at least one type of devices can be tested at the same time.

The invention relates to the technical field of chemical experiment equipment, in particular to a Joule heat-based programmable heating and quenching reaction device capable of continuously replacing reactors. The problems that a traditional reaction device is low in efficiency and cannot operate continuously are solved. The device comprises a reactor placing disc, a copper electrode, a motor and upper and lower end electrodes, a plurality of sites are arranged on the outer edge of the reactor placing disc, so that a plurality of reactors can be loaded at one time; the copper upper electrode and the copper lower electrode are contacted with the reactor to form a current path, and Joule thermocurrent is conducted to realize rapid temperature rise; the motor drives the placing disc to rotate step by step according to a preset program, the control system adjusts the rate and the dwell time, and it is ensured that each reactor completes the heating and quenching cycle. The core of the invention is to realize continuous replacement, heating and quenching of the reactor through the synergistic effect of multi-reactor site rotary switching, electric control programmed operation and Joule heat direct heating, without interrupting the process, so that the reaction efficiency and the automation level are remarkably improved.

The invention discloses a micro-positive pressure anti-explosion flow transmitter and a flow detection method, and relates to the technical field of anti-explosion flow transmitters. The transmitter consists of an upper part, a middle part and a lower part, wherein the lower part comprises a three-way base, a thermal mass flow chip (sealed by ceramic and encapsulated by epoxy resin) and a shell joint cover; the middle part comprises a PCB (integrated operational amplification and signal conversion circuit) in an explosion-proof cavity and a shell cylinder; and the upper part comprises a cable and a brass nickel-plated explosion-proof stuffing box. According to the detection method, based on the thermal mass flow chip, the constant temperature difference principle and the Min's law (P / deltaT = K1 + K2f (qm) K3), the micro-positive pressure (50-500 Pa) gas flow is calculated by detecting the temperature difference and heating current change when gas flows through the chip, a 4-20 mA signal is output to the positive pressure controller, and flow monitoring, gas replacement judgment and fault alarm are achieved. The problem that an existing transmitter cannot detect micro-positive pressure gas is solved, the explosion-proof performance is excellent, and the transmitter can directly work in a dangerous area.

A thermoelectric conversion element (1) is made of a material that is able to be magnetized in any direction at zero magnetic field, has a box shape extending in one direction (direction y), and is magnetized in a direction +z. When heat current Q (~-VT) flows through the thermoelectric conversion element (1) in a direction +x, a temperature difference is created in the direction +x. As a result, the anomalous Nernst effect generates electromotive force V (~M×(-VT)) in the thermoelectric conversion element (1) in an outer product direction (direction y) perpendicular to both the direction of the heat current Q (direction +x) and the direction of magnetization M (direction +z). Examples of the material of the thermoelectric conversion element (1) include a ferrimagnet with a composition of R2Co7 where R is a rare-earth element.

The invention discloses a printed circuit board low-temperature heating power supply assembly which comprises a printed circuit board and circuit elements arranged on the printed circuit board, the printed circuit board comprises a surface metal wiring layer and at least one inner metal wiring layer, the surface metal wiring layer is arranged on the front face and / or the back face of the printed circuit board, and the inner metal wiring layer is arranged on the front face and / or the back face of the printed circuit board. The inner metal wiring layer is arranged in the middle of the thickness direction of the printed circuit board, and the inner metal wiring layer and the surface metal wiring layer are arranged at intervals through the insulating base material; the circuit element comprises a heating element, a switch element and a temperature control electronic assembly; the heating element, the surface metal wiring layer and the inner metal wiring layer form a heating current loop; the switch element is connected in series with the heating current loop and is used for controlling the on-off of the heating element; the temperature control electronic assembly forms a temperature control circuit, is electrically connected with the switch element and is used for detecting the temperature and controlling the switch-on and switch-off of the switch element, and the printed circuit board low-temperature heating power supply assembly can meet the requirement for stable starting of electronic equipment in an extremely low-temperature scene.

The invention discloses a motor driving method and device. The method comprises the following steps: acquiring a target output torque reference value, a target stator flux linkage reference value, a maximum allowable current value and a heat production current reference amplitude of a motor; in a preset first corresponding relation, obtaining a target heat production current range value corresponding to the target output torque reference value and the target stator flux linkage reference value; a target heat production current value is determined according to the size relation among the maximum allowable current value, the heat production current reference amplitude and the target heat production current range value; in a preset second corresponding relation, motor driving current values corresponding to the target output torque reference value, the target stator flux linkage reference value and the target heat production current value are obtained; a drive current having a motor drive current value is generated, and a motor is driven by the drive current. According to the embodiment of the invention, the heat production amount of the system can be actively adjusted to be dynamically matched with the heat demand of the whole vehicle, so that the problem that the heat production amount of the motor is uncontrollable in related technologies can be solved.

The embodiment of the utility model provides a charging system and electronic equipment, and belongs to the technical field of charging, the charging system comprises a wired charging module and a wireless charging module which are electrically connected with a battery, the wired charging module is at least partially arranged on a first circuit board, and the wireless charging module is arranged on a second circuit board. The wireless charging module and the wired charging module are respectively distributed on the first circuit board and the second circuit board on the two sides of the battery in a distributed mode, compared with the mode that the wireless charging module and the wired charging module are concentrated on the main control board, heat generated by the wireless charging module can be dispersed to the second circuit board, and the effect of heat source dispersion is achieved; the problem that heat concentration easily causes overtemperature to trigger heat current limiting is solved, and the charging speed is increased. When the electronic equipment is arranged on the charging base to realize wireless charging, rapid heat dissipation of the wireless charging module on the second circuit board can be realized by virtue of a fan and the like in the charging base, so that the heat dissipation effect is improved, and the wireless charging speed is further improved.

The invention provides a heating control circuit and a heating control method. The heating control circuit comprises a manual heating control circuit, an automatic heating control circuit and a heating current detection circuit, the manual heating control circuit and the automatic heating control circuit are both connected with the heating current detection circuit; the manual heating control circuit is used for acquiring a manual heating switch signal of the airplane and judging whether to output a heating voltage or not according to the manual heating switch signal; the automatic heating control circuit is used for receiving a heating control signal output by the microprocessor and judging whether to output a heating voltage according to the heating control signal; and the heating current detection circuit is used for detecting heating current, transmitting a heating detection signal generated by detection to the voltage acquisition circuit at the rear end, and judging whether the heating control circuit works normally or not through the heating current detection circuit and the voltage acquisition circuit. Automatic operation of heating judgment is achieved, and reliability and safety of heating control are improved.

This application provides a motor controller, a powertrain, and an electric vehicle. The motor controller is configured to output a drive current or a heating current to an asynchronous motor, and both the drive current and the heating current are three-phase currents. A waveform of each phase current of the drive current is a sine wave, and the drive current is used to control the asynchronous motor to output torque. A waveform of each phase current of the heating current is a square wave or a step wave, and the heating current is used to control the torque output by the asynchronous motor to be zero, and heat a winding of the asynchronous motor. Heat generated by the heating current on the winding of the asynchronous motor heats a power battery via a heat conduction apparatus. The motor controller provided in this application adjusts a waveform of the heating current, to reduce thermal stress on a switch component in the motor controller, to prolong a service life of the switch component. When switch components used by the motor controller have a same heat resistance capability, heating power can be further increased.

The invention relates to a low-power reactor with a high-temperature coolant for nuclear power engineering. The high-temperature coolant device for protecting a nuclear reactor comprises a power supply network, an absorption rod (4, 4a, 4b) which is made to be inserted into the core for emergency protection and is equipped with an actuator with a holding electromagnet for fixing the rod in a given position, an additional emergency protection absorption rod (5), and a universal electrical disconnector (11) for the power supply network current. The power supply network is designed so that the current flows through the windings of the holding electromagnets of all the absorption rods in sequence. In addition, the circuit of the current comprises at least one direct-acting thermal current disconnector (8) located in a jacket isolated from the coolant in the hot coolant flow or at the core outlet, and at least one electrical circuit breaker (11) installed in the jacket of the absorption rod (5), isolated from the coolant, and located above the absorption rod (5), which comprises a temperature-sensitive current disconnector (9) with a fusible lock. The technical result is to ensure that all absorption rods are triggered in an emergency.

The invention relates to a method for operating a fuel cell system (100), in particular of a vehicle (200), by a control unit (FCCU), comprising: providing (110), by means of the control unit (FCCU), a respective heating current ( / i,k) to a heater of a number (n) of heaters of the fuel cell system (100) in a second calculation step (k), wherein the heating currents ( / i k) in total result in an overall heating current (I ges,k); predicting (120), by means of the control unit (FCCU), the overall heating current (I ges,k+i) for a third calculation step (k+1), following the second calculation step (k), in dependence on the overall heating current (I ges,k) of the second calculation step (k); and operating (130), by the control unit (FCCU), the fuel cell system (100) in dependence on the overall heating current (I ges,k+1) of the third calculation step (k+1). The invention also relates to a fuel cell system (100), to a computer program product, to a computer-readable data carrier, to a control unit (FCCU) and to a system (200).

The invention discloses a bipolar zigzag directional solidification casting heating device and a use method, the bipolar zigzag directional solidification casting heating device comprises: a heat insulation assembly defining a heat preservation cavity; the heating assembly is arranged in the heat preservation cavity and used for conducting radiation heating on the in-line casting module stretching into the heat preservation cavity; the heating assembly is divided into an upper heating group and a lower heating group along the height direction, and each heating group comprises a left electrode heating assembly and a right electrode heating assembly which are oppositely arranged and electrically isolated from each other, so that four closed electric heating loops which are electrically isolated from each other are formed; heating plates in the left side electrode heating assembly and the right side electrode heating assembly are staggered in a zigzag shape, so that the contours of the heating plates on the left side and the right side are opposite and form a plurality of rhombic heating spaces for accommodating single castings; the temperature control assembly is provided with temperature measuring points corresponding to the four closed electric heating loops respectively and used for collecting temperature feedback signals of the loops and conducting independent closed-loop adjustment on heating currents of the loops; and the conductive assembly is electrically connected with the heating assembly and is used for accessing an external power supply. The invention aims to enable the heating structure to realize uniform heating in multiple direction dimensions, realize relatively symmetrical intense radiation heat exchange in all directions, improve the uniformity of a temperature field, and reduce the risk of occurrence of defects such as mixed crystals and freckles.

The invention discloses a conductive method and structure for a gold and copper imitating furnace body of a hardware decoration coating machine, and belongs to the technical field of coating equipment. The method comprises the steps of obtaining furnace body parameters, calculating an insulation guide rail installation angle, constructing an electric field-temperature field-film thickness coupling model, calculating theoretical current and preheating current, evaluating electric field uniformity, monitoring branch health degree and conducting self-adaptive compensation. And the positions of the insulation blocks are controlled in stages to realize dynamic conductive control of centralized preheating, uniform coating and material taking open circuit. According to the invention, the current distribution uniformity, the film thickness consistency and the energy efficiency utilization rate can be effectively improved, and the equipment energy consumption and the operation complexity are reduced.

The embodiment of the invention discloses a self-heating evaluation method and device, and the method comprises the steps: carrying out the electrical simulation of the electrical characteristic parameters of a to-be-tested device based on a physical model, obtaining the electrical current and voltage characteristics of the to-be-tested device, and obtaining the self-heating evaluation of the to-be-tested device according to the electrical current and voltage characteristics and the actual current and voltage characteristics. The electrical characteristic parameters of the device to be tested are corrected to obtain corrected parameters, thermal effect analog simulation is carried out on the corrected parameters based on the thermodynamic model to obtain the self-heating current and voltage characteristics of the device to be tested, and the obtained corrected parameters conform to the actual electrical characteristics, so that the self-heating current and voltage characteristics of the device to be tested are improved. Therefore, the thermal effect analog simulation realized based on the correction parameters has higher accuracy, and the evaluation cost is reduced.

The invention relates to the technical field of power distribution equipment, particularly discloses an intelligent method for state monitoring and fault diagnosis of power distribution electrical equipment, and aims to improve the precision of fuse heating control and ensure safe and stable operation of electronic equipment. A fuse temperature model is constructed according to the target temperature, the fusing time of the fuse is predicted based on the model, then the change condition of the target temperature along with the time is determined, and accurate control over the fuse heating process is achieved by calculating the heating current control quantity and updating and adjusting the current flowing through the fuse. According to the technical scheme, the heating current can be dynamically adjusted according to the actual state of the fuse wire, it is ensured that the fuse wire reaches the fusing point within the preset time, the heating control precision and the system adaptability are remarkably improved, and the method has great significance in improving the safety and stability of electronic equipment.

The invention discloses a steady controllable heating method for a thermionic cathode, and relates to the technical field of thermionic cathode electron emission, and the method comprises the following steps: S1, signal acquisition and processing; s2, signal conversion; s3, negative feedback of the workflow; s4, collecting electric data at two ends of the hot cathode load; s5, adjusting a constant-temperature mode; and S6, constant current mode adjustment. Based on a negative feedback circuit composed of a triode, an amplifier and a feedback resistor, stable and accurate control over cathode heating current and heating temperature is achieved, the heating power supply can keep high precision and stability under different load resistance values, the precision and real-time control problems existing in traditional design are solved, and in addition, the heating power supply can be applied to a high-voltage power supply. The method also has the advantage of easy realization of computer end control, provides greater operation flexibility for the user, and improves the working efficiency and the operation convenience.

A method for manufacturing a spot welded joint disclosed herein includes a step of formally energizing a plate assembly comprising one or more steel components with a tensile strength of 980 MPa or higher, and a step of subsequently energizing the plate assembly. In this method, formal energizing is controlled by means other than adaptive control. Based on a pre-calculated cumulative heat generation per unit volume that allows for proper subsequent energizing of the plate assembly, the instantaneous heat generation per unit volume and per unit time is calculated based on the energizing time of the subsequent energizing. The subsequent energizing is adjusted using the inter-electrode resistance or inter-electrode voltage, or the subsequent thermal current that generates the calculated instantaneous heat generation per unit volume and per unit time, thereby performing adaptive control.

The invention discloses a multi-pole-moment multi-layer low-magnetic-field flexible film electric heater and a design method thereof, and belongs to the technical field of electric heaters. The heater aims to solve the problem that the performance of a precision sensor is affected due to large magnetic field interference of a heater in the prior art. The heater comprises at least two electric heating layers, and each layer comprises at least four wire sections. The core is as follows: 1) N wire sections in each layer are configured in a specific current direction to form an intra-layer multi-pole-moment magnetic field suppression configuration; and (2) an interlayer multi-pole-moment magnetic field suppression structure is formed among the multiple electric heating layers through specific current direction configuration. The invention further discloses a corresponding systematic design method which comprises the steps of determining the number of wires / layers, configuring the current direction in the layers / between the layers, optimizing the layout and conducting simulation verification. The magnetic field generated by heating current and the gradient thereof can be remarkably reduced, and the method is suitable for precise instruments with harsh requirements for the magnetic field environment.

The application belongs to the field of infrared detector manufacturing, and specifically discloses a kind of ceramic package pulse current activation methods of infrared detector. The method comprises: providing a ceramic package infrared detector assembly, the two ends of the sheet-shaped non-evaporable getter in the assembly are fixed on two first type conductive columns;Electricity contact probe is contacted with the first type conductive column;Preheating current is applied to the getter through the first type conductive column, then high-frequency pulse current is applied to activate, so that the getter body reaches the activation temperature due to Joule effect;During the pulse current activation process or after activation, the detector chip is subjected to low-temperature thermal stabilization treatment. The application realizes the rapid local activation of the getter by pulse current, shortens the process time, reduces the energy consumption, avoids thermal damage, and improves the performance of the detector, and is especially suitable for ceramic packaged infrared detectors.

This method for estimating the temperature of a semiconductor device comprises: a step for supplying a heating current to a DUT; a step for supplying a measurement current to the DUT; a step for stopping the heating current to allow the DUT to dissipate heat; a step for acquiring a voltage drop of the DUT in the preceding step; and a conversion step. In advance, for a second semiconductor device under test, a temperature / voltage drop curve is measured in which the voltage drop of a second measurement target portion changes with at least one of maximum and minimum values as the temperature of the second measurement target portion decreases. In the conversion step, time-series data of the voltage drop of a first measurement target portion of the DUT is converted into time-series data of the temperature of the first measurement target portion using the one-to-one correspondence between the temperature of each and every second measurement target portion with the voltage drop of the second measurement target portion in the temperature / voltage drop curve.

This application provides a heating circuit and heating device for a curved blackbody radiation source. The heating circuit includes: a heating device connected to a relay for generating a heating current based on the relay current; a temperature sensor connected to the heating device for acquiring the temperature of the heating device; a temperature control system connected to the temperature sensor for generating a control signal based on the temperature; and a relay connected to the temperature control system for generating different relay currents based on the control signal. The heating current is converted into thermal energy by the heating device to heat the curved blackbody. This ensures that the heating of the spherical blackbody is as uniform as possible, and since the heating device can control the heating process according to the temperature control system, it ensures convenient and quick heating of the spherical blackbody under repeated heating conditions.

The application provides a pipe defect risk early warning method based on industrial big data, and belongs to the technical field of early warning. The pipe defect risk early warning method based on industrial big data comprises the following steps: S1: collecting a multi-section heating current sequence of a pipe extruder barrel and a circumferential dielectric capacitance distribution sequence of a cooling and demolding section; S2: performing smoothing processing on the multi-section heating current sequence, extracting a thermal pulsation range difference representing melt plasticization fluctuation, and extracting a dielectric divergence feature representing pipe internal compactness abnormality based on the circumferential dielectric capacitance distribution sequence; S3: time window registering the thermal pulsation range difference and the dielectric divergence feature, and constructing a plasticization-dielectric coupling scatter point set reflecting pipe forming quality in a two-dimensional space; and S4: periodically calculating a minimum circumscribed polygon area of the plasticization-dielectric coupling scatter point set, and defining an expansion slope of the area with time as a pipe degradation incubation index.

The invention provides a breathing heating pipeline fault monitoring method and device and electronic equipment, and relates to the field of fault monitoring, and the method comprises the steps: determining a lower heating wire corresponding to each heating pipeline unit according to the current heating wire heating current corresponding to each heating pipeline unit in a breathing heating pipeline; inputting the current temperature corresponding to each heating pipeline unit to a preset calibration function to obtain a temperature output value corresponding to each heating pipeline unit output by the preset calibration function; and when any temperature output value is greater than or equal to a preset temperature threshold value, determining that the temperature sensor corresponding to the heating pipeline unit has a fault. According to the invention, the method achieves the determination of the preset calibration function through the nonlinear fitting, achieves the fault monitoring of each temperature sensor through the preset calibration function, improves the accuracy of fault monitoring, reduces the calculation complexity of fault monitoring, and improves the sensitivity of fault monitoring.

The invention discloses a new energy electric compressor preheating and soft start cooperative control method, and belongs to the technical field of new energy automobile thermal management. The method comprises the steps that the temperature of a compressor shell and the temperature of cooling liquid are obtained, and whether low-temperature preheating conditions are met or not is judged; if yes, specific preheating current is applied to enable the winding to heat so as to heat the refrigerating machine oil, and parameters such as winding resistance are monitored in real time; dynamically judging the starting opportunity based on the resistance variable quantity, and seamlessly switching to a soft starting mode after a threshold value is reached; smooth starting is achieved through frequency conversion control signals of frequency connection, the soft starting voltage boosting amount is dynamically optimized according to the preheating effect, and finally the compressor is stably increased to the target rotating speed. Through cooperative control and parameter linkage of preheating and soft starting, low-temperature starting resistance and current impact are effectively reduced, the reliability and energy efficiency of the system are improved, and the service life of the system is prolonged.