27results about How to "Guaranteed sampling accuracy" patented technology

The invention provides a digital twin system, method and device for a traction transmission system of a rail transit vehicle, and the system comprises a multi-time-scale digital twin architecture composed of a physical entity layer, an interactive perception layer, a vehicle-mounted virtual body layer, a ground virtual body layer and a smart cloud platform layer. A vehicle-mounted digital twinborn board card is used for depicting a vehicle-mounted small-time-scale real-time digital twinborn body, the high requirements of an electrical model in a traction transmission system of a rail transit vehicle for discretization frequency and resolving real-time performance are met, and the sampling precision of data is guaranteed; in a ground virtual body layer, a server is used for describing a ground-level large-time-scale real-time digital twinborn body at a cloud end, when an actual traction system is abnormal, early warning and adjustment can be carried out in time, the consistency of a model calculation result and an actual system state is ensured, communication with other digital twinborn bodies can be carried out, and the real-time performance of the traction system is improved. Safe and reliable operation of a traction transmission system is guaranteed, and finally reliability improvement, data mining and information fusion of all key systems of the whole vehicle are promoted.

The utility model discloses a blast furnace under-tank sinter belt head sampling device, which comprises a rack positioned at the head of a sinter belt, a swing arm is rotatably mounted on the rack, a telescopic material intercepting mechanism is fixed at the other end of the swing arm, and the material intercepting mechanism comprises an outer arc-shaped guide plate, an inner arc-shaped guide plate and a first linear execution element; a guide hopper is fixed to the machine frame, a second linear execution element is hinged to the guide hopper, and the output end of the second linear execution element is hinged to the outer arc-shaped guide plate. Through cooperative work of the first linear execution element and the second linear execution element, the inner arc-shaped guide plate moves to the position intersecting with the parabolic discharging track of sintered ore output by the head of the sintered ore belt, the inner arc-shaped guide plate and the outer arc-shaped guide plate are matched to guide the sintered ore to the guide hopper, automatic sampling can be achieved, shutdown is not needed, and the sampling efficiency is improved. Sintered ore of the whole belt section is sampled, the sampling precision can be guaranteed, meanwhile, the sampling amount can be increased, and the sintered ore is prevented from being separated in the sampling process.

The invention discloses a current detection device, a control method, a control device, equipment, a medium and a vehicle, the current detection device comprises a controller, a first current detection branch and a second current detection branch, the first current detection branch and the second current detection branch are connected in parallel, the first current detection branch comprises a first current sampling resistor, and the second current detection branch comprises a second current sampling resistor. The second current detection branch comprises a second current sampling resistor and a switching device, the resistance value of the first current sampling resistor is larger than that of the second current sampling resistor, and the controller controls the switching device to conduct the second current detection branch under the conditions that the second current detection branch is disconnected and the detection current value is larger than a first current threshold value. And when the second current detection branch is conducted and the detection current value is smaller than a second current threshold value, the switching device is controlled to disconnect the second current detection branch, and the detection current value is the total current value flowing through the current detection device. According to the embodiment of the invention, the detection precision of currents with different magnitudes can be met at the same time.

The invention discloses a soil gas sampler, a sampling method, a detection method and a dynamic change monitoring method, which belong to the technical field of soil gas detection. The invention comprises a sleeve, wherein a sampler is installed inside the sleeve. The sampling method of the soil gas sampler comprises: a first step, implanting the soil gas sampler; a second step, exhausting and gas replacement; a third step, soil gas sampling, and also comprises a soil gas detection method and a soil gas dynamic change monitoring method. The working process of the monitoring method is as follows: a first step, dynamic index detection; a second step, soil gas detection; a third step, fitting calculation; a fourth step, difference curve calculation; a fifth step, soil gas dynamic change monitoring output; a sixth step, soil gas content expression. The soil gas sampler, sampling method, detection method and dynamic change monitoring method of the invention have accurate soil gas sampling and detection, and can accurately characterize the actual soil gas content of the sampling point.

The invention provides a three-phase motor phase current sampling processing method, a three-phase motor control method and a three-phase motor, and the three-phase motor phase current sampling processing method comprises the steps: obtaining the on-off moments of at least a part of semiconductor switch tubes in a three-phase full-bridge inverter circuit in a first carrier period and a second carrier period, wherein the first carrier wave period and the second carrier wave period are two adjacent PWM carrier wave periods; determining a sampling moment according to the on-off moments of at least part of the semiconductor switch tubes in the first carrier period and the second carrier period and the time length Tsamp required by sampling; starting sampling on conduction voltage drop values of at least part of lower bridge arm semiconductor switch tubes of the three-phase full-bridge inverter circuit at a sampling moment; and calculating the current value of each phase of the three-phase motor according to the conduction voltage drop values of at least part of the lower bridge arm semiconductor switch tubes. According to the three-phase motor phase current sampling processing method provided by the embodiment of the invention, the technical problem that the three-phase motor phase current sampling is inconvenient and inaccurate in the prior art is solved.

The application relates to the technical field of switch driving, in particular to a current sampling circuit for a high-side switch driving circuit, a chip and electronic equipment. The current sampling circuit comprises a second transistor, a third transistor, an operational amplifier and a voltage clamping circuit. The operational amplifier is used to work in a linear amplification state, so that the second electrode of the high-side switch tube and the second electrode of the second transistor are in a virtual short state. The voltage clamping circuit is used to collect a first voltage on the second electrode of the high-side switch tube, and output a voltage clamping signal when the first voltage is greater than a preset second voltage. The voltage clamping signal is used to clamp the voltage difference between the first electrode and the second electrode of the high-side switch tube to a preset third voltage. In this way, when the load current of the branch where the high-side switch tube is located is small, the offset voltage can be negligible compared with the third voltage, so as to reduce the influence of the offset voltage on the load current and ensure the sampling accuracy of the load current.

The invention provides a signal sampling system, method and device, sampling test equipment, a medium and a product, the system comprises the sampling test equipment and tested equipment, and the sampling test equipment comprises a controller, a digital-to-analog converter and a comparator; the controller is used for acquiring a target sampling task and determining a trigger signal; the digital-to-analog converter is used for determining triggering times and a level value based on task completion precision of the target sampling task, and feeding back the level value corresponding to the triggering times to the comparator; the tested equipment is used for determining the level of a tested signal based on the trigger signal and feeding back the level of the tested signal to the comparator; the comparator is used for determining a level sampling combination matrix according to all the level values and the level of the tested signal, and feeding back the level sampling combination matrix to the sampling test equipment; the sampling test device is used for determining a signal sampling result based on the level sampling combination matrix. According to the technical scheme, an analog-to-digital converter is replaced by the combination of the digital-to-analog converter and the comparator, so that the sampling cost is reduced.

The utility model discloses a hydrogeological stratified sampling device, which relates to the technical field of hydrologic engineering and comprises a base, a screw rod driving mechanism is mounted at the top of the base, a fixed cylinder is arranged above the base and connected with the screw rod driving mechanism, and a plurality of inner sampling holes are uniformly formed in the inner wall of one side of the fixed cylinder. When the fixed cylinder and the blocking sleeve enter the holes, the plurality of inner sampling holes in the fixed cylinder can be blocked by the blocking sleeve, so that soil cannot enter the holes firstly. When the sampling device reaches a specified depth, a plurality of electric telescopic rods are started, so that a plurality of outer sampling holes in a blocking sleeve correspond to a plurality of inner sampling holes in a fixed cylinder in position, and the output ends of the electric telescopic rods continuously extend, so that a plurality of sampling cylinders are moved out of the inner sampling holes, and layered sampling can be realized while the sampling accuracy is kept.

The utility model discloses an anaerobic reactor sampling device, which belongs to the technical field of anaerobic reactor sampling, and comprises a mounting rack, an anaerobic reactor body is mounted on the mounting rack, a plurality of sampling suction pipes are mounted on the anaerobic reactor body in an embedded manner, and a plurality of water pumps are mounted at the upper end of the mounting rack. A plurality of water pumps are arranged on the filter screen, the rear ends of the plurality of water pumps are fixedly connected with the front ends of the plurality of sampling suction pipes respectively, the front ends of the plurality of water pumps are fixedly connected with sampling calandrias, and first valves are mounted on the sampling calandrias. The electric telescopic rod drives the knocking hammer to repeatedly knock the connecting frame, so that the connecting frame vibrates with the filter screen, the dirt attached to the lower end of the connecting frame is vibrated off, the filter screen is prevented from being blocked, and the sampling circulation effect is guaranteed.

The invention provides a water conservancy project detection method, and belongs to the technical field of water body sampling. The water conservancy project detection sampling method is used for carrying out sampling detection on a water conservancy project, and is realized through the water conservancy project detection sampling system. Through the arrangement of the inner rod and the outer pipe, the water body sampling mechanism is put into water, the handle is pressed to enable the sealing gasket to move downwards to open the first water inlet, then the handle is pressed to enable the inner rod to move downwards to enable the first water inlet to correspond to the second water inlet, and at the moment, upper-layer water, middle-layer water and lower-layer water flow into the corresponding water storage cavities respectively; the inner rod is pulled out, water samples of all layers can be collected through one-time operation, operation is easy and convenient, and water sampling convenience and efficiency are greatly improved.

The embodiment of the utility model discloses a temperature monitoring stable power supply circuit, which relates to the technical field of power supply, is used for supplying power to a temperature sampling module, and comprises a power supply module, a transformer output module, a control module and a power supply feedback module, the power supply module is connected with the transformer output module and the control module, the control module is connected with the transformer output module, the transformer output module is connected with the temperature sampling module, and the power supply feedback module is respectively connected with the transformer output module and the control module. The power supply feedback module is used for monitoring the voltage output by the transformer output module to the temperature sampling module and feeding back the voltage to the control module, so that when the voltage output by the transformer output module deviates, the control module can adjust the voltage output by the transformer output module at the first time; the stability of the voltage output by the transformer output module is ensured, and then the sampling precision of the temperature sampling module is ensured.

The invention relates to the technical field of switch driving, in particular to a current sampling circuit for a high-side switch driving circuit, a chip and electronic equipment. The current sampling circuit comprises a second transistor, a third transistor, an operational amplifier and a voltage clamping circuit. The operational amplifier is used for working in a linear amplification state, so that the second electrode of the high-side switching tube and the second electrode of the second transistor are in a virtual short state; the voltage clamping circuit is used for collecting a first voltage on a second pole of the high-side switching tube and outputting a voltage clamping signal when the first voltage is greater than a preset second voltage; and the voltage clamping signal is used for clamping the voltage difference between the first pole and the second pole of the high-side switching tube to a preset third voltage. In this way, when the load current of the branch where the high-side switching tube is located is small, the offset voltage and the third voltage can be ignored compared, so that the influence of the offset voltage on the load current is reduced, and the sampling precision of the load current is guaranteed.

The utility model discloses a powder sampling device and a chemical vapor deposition system comprising the same, and relates to the technical field of sampling devices.The powder sampling device specifically comprises a sampling pipe, a gas-solid separation assembly and a sample bin, the sampling pipe is connected to the gas-solid separation assembly through a connecting gas pipe, and the gas-solid separation assembly is connected to the sample bin through a connecting gas pipe; the sample bin is connected to the gas-solid separation assembly through a material guide pipe; at least one sampling hole is formed in the sampling pipe at equal intervals, and a two-way valve is arranged at the sampling hole; or, the sampling tube is telescopic; or the sampling pipe is provided with two or more sampling pipelines with different lengths in parallel. The powder sampling device disclosed by the utility model is suitable for sampling the running state of the high-temperature furnace, can go deep into the furnace body, realizes on-line sampling of incapable sites in the furnace body, ensures the accuracy of a sampled sample, realizes monitoring of product quality in a powder production process, greatly improves the production efficiency of a production line, and improves the quality of a produced product.

This application provides a control method for a multi-channel selector for fuel cell voltage monitoring. When switching battery channels using at least one single-cell two-channel selection module, the equivalent output impedance of the channel to be switched is determined based on the current input impedance and historical internal resistance. Based on this equivalent output impedance, the target capacitance value and target capacitance level of the holding capacitor in the signal holder are determined. The holding capacitor is adjusted to the target capacitance level, and the charging current during charging and discharging is adjusted according to the target capacitance level. The actual charging and discharging time constant is determined based on the equivalent output impedance and the target capacitance value. The equivalent damping resistance of the signal holder is adjusted based on the actual charging and discharging time constant and the maximum charging and discharging time constant to match the maximum charging and discharging time constant. Through the above technical solution, precise control of the multi-channel selector is achieved.

The invention provides a control method of a multi-channel selector for fuel cell voltage inspection, and the method comprises the steps: determining the equivalent output impedance of a to-be-switched channel based on the input impedance and historical internal resistance at the current moment under the condition that cell channel switching is carried out through at least one single-cell two-channel selection module; based on the equivalent output impedance, determining a target capacitance value and a target capacitance gear of a holding capacitor in the signal holder, adjusting the holding capacitor to the target capacitance gear, and adjusting a charging current in a charging and discharging process according to the target capacitance gear; determining an actual charging and discharging time constant according to the equivalent output impedance and the target capacitance value; adjusting the equivalent damping resistance of the signal holder according to the actual charging and discharging time constant and the maximum charging and discharging time constant, so that the actual charging and discharging time constant is matched with the maximum charging and discharging time constant; by means of the technical scheme, accurate control over the multi-channel selector is achieved.

The embodiment of the application relates to the technical field of vehicles, and discloses a voltage sampling circuit, an operating method and device of the voltage sampling circuit, and a vehicle, a shunt, a voltage collection chip and a voltage regulating device. The shunt is used for being connected in series with a to-be-measured battery group. The voltage collection chip is connected with a first end of the shunt through a first sampling pin and connected with a second end of the shunt through a second sampling pin. The voltage regulating device is connected between the first end of the shunt and the first sampling pin of the voltage collection chip, and / or connected between the second end of the shunt and the second sampling pin of the voltage collection chip. The voltage regulating device is used for receiving a first differential voltage generated at two ends of the shunt, attenuating the first differential voltage, and outputting a second differential voltage. In this way, the influence of common-mode interference on current collection accuracy in the battery pulse heating process can be inhibited.

The invention relates to a current detection resistor and a manufacturing method thereof. The current detection resistor comprises a resistor disc, two cooling fins and an insulating sleeve, two electrode parts are arranged at the two ends of the resistor disc, each cooling fin comprises a connecting part, a transition part and a tilting part which are connected in sequence, the connecting part is attached to the single electrode part, the two cooling fins are separated, and the insulating sleeve is arranged between the two cooling fins. The middle part of the resistor disc and the transition parts and the upwarp parts of the two radiating fins are completely wrapped by the insulating sleeve; and the upwarp parts are closer to the outer wall of the insulating sleeve than the connecting parts. When the current detection resistor is used, the tilting part is separated from the resistor disc by a certain distance, so that the two surfaces of the tilting part have effective heat dissipation areas and can dissipate heat to the material of the insulating sleeve, and the upper surface of the tilting part is closer to the outer wall of the insulating sleeve, so that the heat can be quickly dissipated, and the current detection resistor can bear higher power under the same volume. The manufacturing method comprises the steps of raw material preparation, raw material bonding, in-mold injection molding and film coating. The current detection resistor is simple in structure, easy to install, low in cost and suitable for batch production.

The invention discloses an automatic solid and liquid sampling device for a production line, which relates to the technical field of sampling equipment and comprises a rack assembly, a swing arm moving assembly and a balance assembly. The rack assembly comprises a base, a stand column and a driving piece. The swing arm moving assembly comprises a first main arm, a second main arm, a swing part, a receiving hopper and an unloading part. One end of the swinging part away from the second main arm is connected with the driving part; the balance assembly comprises balance rod sets. The driving part rotates to drive the swing part to swing towards or away from the stand column, so that the receiving hopper is driven to move towards or away from the stand column, receiving or discharging operation is conducted after the receiving hopper moves, the levelness of the receiving port during receiving is kept through the balance rod set, sampling precision is guaranteed, manual sampling is completely replaced, and the sampling precision is high; direct contact between personnel and operation equipment is avoided, safety risks are remarkably reduced, the intrinsic safety level of a production line is improved, production efficiency is remarkably improved, and labor cost is reduced.

The utility model discloses a drilling and soil sampling device for soil detection, which relates to the technical field of soil detection and comprises a fixing plate and an adjusting plate, the surface of the fixing plate is in threaded connection with at least three adjusting threaded rods, and the bottoms of the three adjusting threaded rods are fixedly connected with rotating hand wheels. Spherical blocks are fixedly connected to the top ends of the three adjusting threaded rods, rotating blocks are fixedly connected to the positions, corresponding to the spherical blocks, of the bottom of the adjusting plate, the spherical blocks are rotatably connected to the interior of the rotating blocks, a sampling assembly is arranged in the middle of the upper surface of the adjusting plate, and a clamping assembly is arranged on the outer side of the upper surface of the adjusting plate. The bottom of the fixing plate is fixedly connected with three height adjusting assemblies. The device has the advantages that the sampling assembly can be kept in a parallel state relative to the ground, so that the sampling depth change caused by inclination of the device during sampling can be avoided, and the condition of soil at a specific layer can be accurately reflected during sampling each time.

The utility model relates to sampling device technical field discloses a new energy automobile gearbox lubricating oil sampling device, including base, the base inside fixedly connected with sampling bottle, the sampling bottle top is provided with connecting assembly, the sampling bottle top is provided with sealing assembly, the connecting assembly includes the first connecting ring fixedly connected in the sampling bottle top, the first connecting ring inside fixedly connected with spring, spring one end fixedly connected with the limit board, the limit board top abuts on the mounting sleeve, the mounting sleeve side wall is opposite and has been set up to install the groove, the mounting sleeve bottom is set up to have the sliding slot, the first connecting ring top abuts on the second connecting ring, in the utility model, through the structural setting of connecting assembly, have solved the sampling bottle and the oil pipe fixed connection assembly in the prior art, when the sampling bottle or the oil pipe is damaged, the problem that the damaged component cannot be separated from the device whole quickly.

A current sampling circuit for an inductive load driving circuit comprises a sampling resistor Rs, an operational amplifier module, a voltage source Vs, and first and second resistor networks. The first resistor network comprises a resistor R3 and a resistor R1 connected in series, and the second resistor network comprises a resistor R4 and a resistor R2 connected in series; one end of the resistor R3 and one end of the resistor R4 are commonly connected to the voltage source Vs, the other end of the resistor R3 and the common point of one end of the resistor R1 are connected to the non-inverting input end of the operational amplifier module, and the other end of the resistor R1 is respectively connected to the output end of the inductive load driving circuit, the second end of the freewheeling circuit and one end of the sampling resistor Rs; the other end of the resistor R4 and the common point of one end of the resistor R2 are connected to the inverting input end of the operational amplifier module, and the other end of the resistor R2 is respectively connected to one end of the inductive load L and the other end of the sampling resistor Rs. The present invention expands the application lower limit range of the common mode input voltage of the operational amplifier module at a relatively low cost.

The invention provides a voltage control and detection circuit, a power conversion device and a charging pile, and belongs to the technical field of circuits. A detection voltage output by an operational amplifier circuit in the voltage control and detection circuit can reflect an error between a reference voltage and an output partial voltage, so that a control circuit realizes closed-loop control of the output voltage of the DC / DC conversion circuit based on the detection voltage. Moreover, the detection voltage can reflect the magnitude of the ripple voltage in the output voltage, so that the control circuit achieves ripple suppression of the output voltage. The voltage control and detection circuit has abundant functions, and can effectively avoid increasing the structural complexity and cost of the power conversion device. Moreover, the operational amplification circuit has a proportional amplification function and can amplify the voltage difference between the reference voltage and the output divided voltage, so that the sampling precision of the voltage can be ensured even if a high-resolution ADC (Analog to Digital Converter) is not used. Therefore, the dependence on the high-resolution ADC is effectively reduced.

The invention discloses a motor controller with a Hall assembly and a Hall coefficient adjusting system and method.According to the motor controller with the Hall assembly, the outer side of a magnetic sensitive chip is sleeved with a magnetic sensitive chip sheath, and the top end of the magnetic sensitive chip sheath is clamped with a notch of a Hall magnetic ring; and the bottom end of the magnetic sensitive chip sheath is clamped with the bayonet of the integrated circuit board through the clamping jaw, so that the magnetic sensitive chip is ensured to be erected in the notch, the magnetic sensitive chip can be prevented from being collided and toppled over, and the acquisition precision of the Hall assembly is improved. According to the Hall coefficient adjustment system and the Hall coefficient adjustment method, the Hall adjustment coefficient can be automatically calculated, so that the sampling precision of the Hall assembly of each electrode controller is ensured.

The invention discloses an interface circuit of an MEMS gas sensor and a control method of the interface circuit, and belongs to the technical field of sensing circuit design, the interface circuit comprises a reference voltage and current generation module, a gear switching module, a resistance conversion voltage module, a bias current generation module and a post-processing module; the equivalent resistance corresponding to the MEMS gas sensor is converted into voltage by using the resistance conversion voltage module, and the gear switching module switches the state to change the voltage amplification coefficient and the current mirror image proportion by fixing the charging current so as to realize the gear detection of the voltage, so that a wider resistance detection range is realized under the same power consumption. Meanwhile, voltage is converted into periods, under the condition that PVT is the same, T1 and T2 periods are subtracted to eliminate error terms, and finally the period T corresponding to the equivalent resistance of the MEMS gas sensor is obtained, so that the detection precision of the equivalent resistance corresponding to the MEMS gas sensor is improved.

An alternating current sampling circuit comprises alternating current to be sampled, a current or voltage conversion circuit, a voltage lifting circuit and a voltage follower circuit, the voltage lifting circuit is composed of a magnetic bead, a second resistor, a third resistor and a first capacitor, one end of the magnetic bead is connected with a first output pin of the conversion circuit, and the other end of the magnetic bead is connected with one end of the second resistor. The other end of the second resistor is connected with direct current bias voltage through a third resistor and grounded through a first capacitor, the voltage follower circuit is composed of an operational amplifier, a second capacitor and a fourth resistor, and the other end of the second resistor is connected with a positive input pin of the operational amplifier. A reverse input pin of the operational amplifier is connected with an output pin of the operational amplifier, a voltage pin of the operational amplifier is connected with power supply voltage and is grounded through a second capacitor, a grounding pin of the operational amplifier is grounded, and an output pin of the operational amplifier is connected with a fourth resistor to adjust input impedance. And the output voltage is input into the analog-to-digital converter.

The utility model relates to the field of soil sampling, in particular to an environmental soil sampler which adopts the technical scheme that the environmental soil sampler comprises a fixed table and an outer cylinder, a first spiral blade is mounted on the outer wall of the lower end of the outer cylinder, a sampling rod is mounted in an inner cavity of the outer cylinder, a drill bit is mounted at the lower end of the sampling rod, and a protection component is mounted at the lower end of the fixed table and positioned outside the outer cylinder; the utility model has the beneficial effects that when the whole outer cylinder is rotated to drill into the ground, the bottom of the outer cylinder firstly drills into the ground through the drill bit, after the required depth is drilled, the rotation of the outer cylinder can be stopped, then the sampling rod is rotated to descend and extend out of the outer cylinder, and when the sampling rod descends, the drill bit is driven to synchronously move, so that the drill bit is separated from the bottom of the outer cylinder; along with the movement of the sampling rod, the sampling rod drills through a second spiral blade on the surface, so that a sampling hole in the surface of the lower end of the sampling rod leaks out, and when the sampling hole leaks out, soil at the bottom of the outer cylinder enters the sampling rod through the sampling hole, so that the sampling precision is ensured.

The present invention discloses a method and system for realizing AC quantity acquisition and calibration of a comprehensive electric power tester, which belongs to the technical field of electric power instruments and meters, and includes: obtaining an external voltage and current input signal, and preprocessing the external voltage and current input signal to obtain a small voltage signal and use it as an input signal of an AD sampling module; performing continuous cycle sampling on the input signal of the AD sampling module according to a set sampling frequency, and performing DFT calculation on the sampling point to obtain the amplitude and phase angle of the three-phase voltage and current; in a calibration mode, calculating the amplitude and phase angle of the three-phase voltage and current with the standard value of the three-phase voltage and current under different gears to obtain the calibration coefficient under each gear; calculating the current voltage and current acquisition actual value according to the calibration coefficient of the current gear and the actual input value, and automatically adjusting the gear. Compared with traditional test instruments, the present invention solves the defect that the acquisition accuracy cannot be improved under a wide range.