45 results about "Nitrogen oxide sensor" patented technology

The application belongs to the field of automobile exhaust aftertreatment, and particularly relates to a two-dimensional calibration method for output results of a nitrogen oxide sensor, comprising the following steps: constructing a ratio table between accurate nitrogen oxide concentration values and corresponding nitrogen oxide concentration test values under different oxygen concentration and nitrogen oxide concentration environments, taking the oxygen concentration and the nitrogen oxide concentration test values as indexes of oxygen concentration and nitrogen oxide concentration in the ratio table respectively, determining the ratio, and correcting the nitrogen oxide concentration test values; constructing a ratio table between accurate oxygen concentration values and corresponding oxygen concentration test values under different second chamber pump currents Ip1 and different oxygen concentration environments, taking the current Ip1 corresponding to the oxygen concentration test value and the oxygen concentration test value as indexes of Ip1 and oxygen concentration in the ratio table respectively, determining the ratio, and correcting the oxygen concentration test values; and finally setting a control target parameter of Ip1 in dynamic control of the nitrogen oxide sensor, and applying the ratio table to the output of the nitrogen oxide sensor. The application can improve the measurement accuracy of the sensor and accelerate dynamic response tracking.

In a method for determining nitrogen oxides and ammonia in the exhaust gas of a vehicle equipped with a nitrogen oxide sensor, measured values ​​from the sensor are received. It is determined whether the measured values ​​show an increasing trend. If so, a lambda value is used to determine whether the sensor readings are representative of nitrogen oxides in the exhaust gas or of ammonia in the exhaust gas. Further measured values ​​from the nitrogen oxide sensor are then assigned to either nitrogen oxides or ammonia, based on the previous determination, until a predefined termination condition is met.Furthermore, an information signal is sent which includes information on whether the further measured values ​​of the nitrogen oxide sensor are still to be attributed to nitrogen oxides or ammonia.

The invention discloses a parameter correction system and method for low emission. The system comprises a gas machine aftertreatment device and an electric control unit. The gas machine post-treatment device comprises a first three-way catalyst converter, a second three-way catalyst converter and a particle trap; a temperature sensor is arranged between the first three-way catalyst converter and the second three-way catalyst converter, and a nitrogen oxide sensor is arranged between the second three-way catalyst converter and the particle trap; the temperature sensor and the nitrogen oxide sensor are electrically connected with the electric control unit respectively; the gas machine post-processing device is used for acquiring a first temperature and an actual oxygen concentration through a temperature sensor and a nitrogen oxide sensor and sending the first temperature and the actual oxygen concentration to the electric control unit; and the electronic control unit is used for correcting the original engine parameters of the engine and the sensor value of the nitrogen oxide sensor based on the first temperature and the actual oxygen concentration so as to optimize the performance and the fuel efficiency of the engine. According to the invention, the accuracy of emission control and the reliability of the system can be improved.

In a method for determining nitrogen oxides and ammonia in the exhaust gas of a vehicle equipped with a nitrogen oxide sensor, a lambda signal is received, and a lambda value is determined based on the lambda signal. This lambda value is representative of the vehicle's air-fuel ratio. Depending on the lambda value, it is determined whether the measured value from the nitrogen oxide sensor is representative of nitrogen oxides in the exhaust gas or whether it is representative of ammonia in the exhaust gas. If the measured value is determined to be representative of ammonia in the exhaust gas, the mass flow rate of the exhaust gas is calculated. Based on the mass flow rate and the lambda value, a nitrogen oxide fraction factor is determined for the measured value. Based on the nitrogen oxide fraction factor, the nitrogen oxide fraction and the ammonia fraction of the measured value are then determined.An information signal is sent that includes information about the nitrogen oxide content of the measured value and the ammonia content of the measured value.

The utility model discloses a tail gas treatment device for nitrogen oxide emission, and relates to the field of tail gas treatment devices for nitrogen oxide emission. The tail gas treatment device for nitrogen oxide emission comprises a tail gas pipeline, a nitrogen oxide storage catalyst, a particulate matter catcher and a selective catalytic reduction catalyst are arranged on the tail gas pipeline, an upstream oxygen sensor is arranged on the upstream of the nitrogen oxide storage catalyst, and a nitrogen-oxygen sensor is arranged on the downstream of the nitrogen oxide storage catalyst. According to the tail gas treatment device for nitrogen oxide emission, a downstream oxygen sensor is omitted at the downstream of the nitrogen oxide storage catalyst, an original nitrogen-oxygen sensor on a vehicle is used for detecting the oxygen concentration and confirming whether regeneration is finished or not, and the nitrogen-oxygen sensor is used for replacing the downstream oxygen sensor, so that the target of replacing the oxygen sensor with a single sensor is achieved; meanwhile, the function of the nitrogen-oxygen sensor is upgraded, and technical reserve is provided for subsequent emission upgrading.

In a method for determining nitrogen oxides and ammonia in the exhaust gas of a vehicle, the vehicle having a nitrogen oxide sensor, measured values of the nitrogen oxide sensor are received. It is determined whether the measured values have an increasing curve. If the measured values have an increasing curve, a lambda value is taken as the basis for determining whether the measured values of the nitrogen oxide sensor are representative of nitrogen oxides in the exhaust gas or whether the measured values of the nitrogen oxide sensor are representative of ammonia in the exhaust gas. Furthermore, until a specified termination condition is met, additional measured values of the nitrogen oxide sensor are assigned to nitrogen oxides or ammonia according to the previous determination as to whether the measured values of the nitrogen oxide sensor are representative of nitrogen oxides in the exhaust gas or whether the measured values of the nitrogen oxide sensor are representative of ammonia in the exhaust gas, and an information signal is transmitted which comprises information as to whether the additional measured values of the nitrogen oxide sensor continue to be assigned to nitrogen oxides or ammonia.

An exhaust pipe discharges exhaust gas discharged from a hydrogen engine to the outside of a vehicle. An exhaust purification device reduces nitrogen oxides contained in the exhaust gas. A nitrogen oxide sensor acquires a measurement value that reflects the concentration of the nitrogen oxides contained in the exhaust gas, and outputs an output value that is a value that is larger the more the amount of moisture contained in the exhaust gas is subtracted from the measurement value. An injector injects urea water to the exhaust purification device. A control device causes the injector to inject an amount of urea water determined in accordance with the output value and the flow rate of the exhaust gas, in a case where the output value is a predetermined value or more. The control device causes the injector to inject an amount of urea water determined in accordance with the predetermined value and the flow rate of the exhaust gas, in a case where the output value is less than the predetermined value.

The application relates to a nitrogen oxide sensor based on Ag2Te / CeO2 sensitive material, a preparation method and a plant internet environment monitoring system, and belongs to the technical field of semiconductor gas sensors. The sensor is composed of an Al2O3 ceramic tube substrate with parallel and mutually independent annular gold electrodes at two ends of an outer surface, Ag2Te / CeO2 sensitive material coated on the outer surface of the Al2O3 ceramic tube substrate and the gold electrodes, and a nickel-chromium heating coil arranged in the Al2O3 ceramic tube substrate; the Ag2Te / CeO2 sensitive material can effectively promote the adsorption of nitrogen oxide molecules at low temperature and enhance the response; in addition, the hollow roll structure formed after the Ag2Te and CeO2 are compounded and the introduction of n-n heterojunction are also beneficial to the response of the sensor. The application combines the sensor with internet of things equipment and internet services, develops a plant internet environment monitoring system, and therefore has important application value for the construction of intelligent agriculture.

Concentration determination device of a cleaning system (301), wherein the cleaning system (301) comprises: an SCR catalyst (4) which is arranged in an exhaust pipe of an internal combustion engine to clean NOx in the exhaust gas of the internal combustion engine; a reducing agent supply unit (5; 302), which is provided and is arranged to supply urea or ammonia as a reducing agent to the SCR catalyst (4); an ammonia sensor (202) which is provided and arranged to detect an ammonia concentration of the exhaust gas flowing out of the SCR catalyst (4) as a downstream ammonia concentration; and a NOx sensor (201) which is provided and arranged to detect a NOx concentration of the exhaust gas flowing out of the SCR catalyst (4) as a downstream NOx concentration; wherein the concentration determination device is configured to determine a value of the downstream ammonia concentration based on a detection result of the ammonia sensor (202), characterized in that the concentration determination device comprises: a feed control section (S2, S30; S10, S35) which controls the reducing agent feed unit (5; 302) to supply the reducing agent to the SCR catalyst in a fuel-free state in which the supply of fuel to the combustion engine is stopped; a feed correction section (S50 to S120) which corrects the determined value of the downstream ammonia concentration based on a detection result of the NOx sensor (201) and an oxygen concentration of the exhaust gas after the feed of the reducing agent to the SCR catalyst (4) with the control of the reducing agent feed unit (5; 302) by the Feed correction section (S2, S30; S10, S35), wherein the concentration determination device converts the detection result of the ammonia sensor (202) into an ammonia concentration value according to an ammonia concentration correction formula which represents a relationship between first and second converted ammonia concentrations, wherein the first converted ammonia concentration is a value calculated according to a relationship formula between the detection result of the ammonia sensor (202) and the ammonia concentration of the exhaust gas, and the second converted ammonia concentration is a value calculated from the NOx sensor (201) detection result and the oxygen concentration of the exhaust gas, and wherein the concentration determination device determines the ammonia concentration value as the downstream ammonia concentration; and wherein the feed correction section (S2, S30; S10, S35) corrects the determined value of the downstream ammonia concentration by updating the ammonia concentration correction formula, wherein the ammonia concentration correction formula in a two-dimensional coordinate system, in which the ammonia concentration converted from the electromotive force is plotted along the x-axis and the ammonia concentration converted from the NOx output is plotted along the y-axis, represents a straight line in the two-dimensional coordinate system among several most recently stored, connects a maximum coordinate point and a minimum coordinate point with the output values ​​obtained from the gas sensor (201, 202).

This application discloses a parameter correction system and method for low emissions. The system includes: a gas engine aftertreatment device and an electronic control unit (ECU). The gas engine aftertreatment device includes a first three-way catalytic converter, a second three-way catalytic converter, and a particulate filter. A temperature sensor is disposed between the first and second three-way catalytic converters, and a nitrogen oxide (NOx) sensor is disposed between the second three-way catalytic converter and the particulate filter. The temperature sensor and the NOx sensor are electrically connected to the ECU. The gas engine aftertreatment device is used to acquire a first temperature and an actual oxygen concentration through the temperature sensor and the NOx sensor, and send them to the ECU. The ECU is used to correct the original engine parameters and the NOx sensor values ​​based on the first temperature and the actual oxygen concentration to optimize engine performance and fuel efficiency. Using this application can improve the accuracy of emission control and the reliability of the system.

The present invention provides a selective catalytic conversion correction method and system, belonging to the field of vehicle energy conservation and emission reduction calculation. The method includes: obtaining the correction amount of the nitrogen oxide sensor according to the HC injection flow rate and the oxygen concentration at the engine outlet, taking the sum of the measured value and the correction amount as the true measured value of this nitrogen oxide sensor, taking the product of the true measured value, the exhaust gas flow rate and the conversion coefficient as the theoretical NH3 injection amount, determining the open-loop set conversion efficiency according to the space velocity and temperature of the selective catalytic conversion device, and taking the product of the open-loop set conversion efficiency, the efficiency correction coefficient based on the temperature of the selective catalytic conversion device, the correction coefficient based on the HC injection amount and the theoretical NH3 injection amount as the final NH3 injection amount; the present invention corrects the NOx sensor by the input HC amount to obtain the correct input NOx concentration, and then corrects the current set efficiency by the HC amount, ensuring the accuracy of NOx control.

The application discloses a modeling method for a nitrogen oxygen sensor NOx pump unit, and belongs to the field of automobile sensors. The method comprises the following steps: considering the reduction reaction of NO and O2 on an electrode to establish an electrochemical sub-model of the NOx pump unit, wherein the electrochemical sub-model comprises Nernst voltage, cathode and anode concentration loss, cathode and anode activation loss and Ohm loss; considering gas diffusion and early decomposition of NO in a second chamber to establish a gas diffusion sub-model of the NOx pump unit, wherein the gas diffusion sub-model comprises diffusion of gas in a diffusion channel and diffusion of gas in the electrode; combining the electrochemical sub-model and the gas diffusion sub-model through a limiting current to obtain a combined model, and the combined model is used for parameter setting and working control of the nitrogen oxygen sensor. Through the combined model which considers all characteristics in the pump unit and eliminates the intermediate variable of gas concentration, the precision and calculation speed of the sensor model are improved.

A diesel engine system (101) for an agricultural machine (100) includes a diesel internal combustion engine (ICE) (201) configured to combust fossil diesel fuel and alternative diesel fuel, a knock sensor (213) integrated in the diesel internal combustion engine (201), a NOx sensor (209) and an electronic control unit (210). The electronic control unit (210) is configured to receive a knocking signal from the knock sensor (213), receive a NOx concentration signal from the NOx sensor (209), determine a fuel specific characteristic value based on the knocking signal and the NOx concentration signal, determine a fuel specific reference value, compare the fuel specific characteristic value with the fuel specific reference value, and determine whether the combusted diesel fuel is fossil diesel fuel or alternative diesel fuel.

An engine control system includes one or more oxygen (O2) sensors disposed proximate to a three-way catalytic converter (TWC) in an exhaust system of the vehicle, a nitrogen oxides (NOx) sensor configured to measure an NOx level of the exhaust gas downstream of the TWC, and a controller. The controller is programmed to determine a downstream O2 sensor control error, compare the O2 sensor control error to a predetermined threshold voltage, enable an NOx control logic if the O2 sensor control error is less than the predetermined threshold voltage, monitor the NOx sensor and integrate a measured NOx concentration for a predetermined time threshold or NOx flow threshold, determine a lambda compensation based on the integrated NOx concentration, and adjust an air / fuel ratio of the engine based on the lambda compensation to reduce NOx breakthrough.

This prevents the deterioration of exhaust emissions when the engine restarts after intermittent shutdown. [Solution] An engine system comprising an upstream catalyst and a downstream catalyst, which are three-way catalysts having oxygen storage capacity; an air-fuel ratio sensor provided between the two catalysts; a NOx sensor provided downstream of the downstream catalyst; and a control device that controls the engine so that the air-fuel ratio becomes a target air-fuel ratio, wherein the control device includes a first candidate calculation unit that calculates a first candidate for a return target air-fuel ratio used for return control from intermittent stop based on the air-fuel ratio detected by the air-fuel ratio sensor during intermittent stop of the engine; an oxygen concentration calculation unit that calculates an oxygen concentration based on the pump cell current of the NOx sensor during the intermittent stop; a second candidate calculation unit that calculates a second candidate for the return target air-fuel ratio based on the oxygen concentration; and a setting unit that sets a final return target air-fuel ratio used for the return control, taking into consideration the first candidate and the second candidate.

This application discloses a fault detection method, device, and electronic equipment for an SCR system. The method includes: determining the volume of urea consumed within a preset time period based on a urea tank level sensor; determining a first mass of urea consumed within the preset time period based on the consumed volume and a preset density value of urea; determining a second mass of urea consumed based on the urea injection rate of the urea nozzle within the preset time period; determining a third mass of urea consumed based on the upstream and downstream nitrogen oxide consumption monitored by a nitrogen oxide sensor within the preset time period; determining whether there is a faulty mass among the first, second, and third masses of urea consumed; if the first mass of urea consumed is a faulty mass, determining that the urea tank level sensor has failed; if the second or third mass of urea consumed is a faulty mass, determining that the urea nozzle has failed. This application improves the accuracy of SCR system fault self-diagnosis, accurately locates faults, and facilitates fault troubleshooting and maintenance.

The invention relates to a method for performing a diagnosis of a nitrogen oxide sensor arranged in the exhaust system of a spark-ignition internal combustion engine of a motor vehicle, in particular a P2 hybrid vehicle. The method determines the current engine speed when the release conditions for the diagnosis are met and it is determined that the vehicle's accelerator pedal has been depressed. From a characteristic curve stored in an electronic computing unit, a minimum overrun time required for performing the diagnosis is calculated for the determined current engine speed. The current vehicle speed is also determined. Depending on the determined minimum overrun time and the determined current vehicle speed, an actual value is read from a characteristic map stored in the electronic computing unit.Then, when the actual value matches a target value, the internal combustion engine is operated in an unfired overrun mode, and the diagnosis is carried out during the unfired overrun mode.

The invention discloses an intelligent NOx filtering control method for an engine, which comprises the following steps: S1, acquiring a measured value of an upstream nitrogen oxide sensor when the engine runs, and acquiring the original nitrogen oxide emission of the engine under the current working condition; s2, performing multiple times of differential logic judgment based on the multi-engine parameters, and dynamically selecting a filtering time parameter calculation path according to a result of the differential logic judgment; the filtering time parameter calculation path comprises any one of'starting an intelligent NOx filtering function 'or'enabling a system to enter a standby state and using an original sensor signal'; and S3, running the filtering time parameter calculation path to obtain a nitric oxide concentration calculation result, and inputting the nitric oxide concentration calculation result to an ECU for accurately controlling an SCR system, OBD diagnosis and engine calibration. The problem that a traditional single filtering time constant cannot adapt to dynamic working condition changes is solved; and the robustness and practicability of the whole control system are enhanced.

The application relates to an exhaust temperature testing system and method for a nitrogen oxide sensor for a vehicle, which comprises a DOC assembly section, a DPF assembly section and an SCR assembly section, the DPF assembly section is arranged between the DOC assembly section and the SCR assembly section, an upstream nitrogen oxide sensor is arranged at the upstream of the DOC assembly section, a downstream nitrogen oxide sensor is arranged at the downstream of the SCR assembly section, a T5 temperature sensor is arranged between the DOC assembly section and the DPF assembly section, and a T6 temperature sensor is arranged between the DPF assembly section and the SCR assembly section. The exhaust temperature testing system and method for the nitrogen oxide sensor for the vehicle can integrate the T4 exhaust temperature sensor and the upstream nitrogen oxide sensor and integrate the T7 and the downstream nitrogen oxide sensor on the basis of the existing aftertreatment system, the number of sensors in the aftertreatment system is reduced, and the cost and the complexity of the engine aftertreatment system can be reduced.

The invention discloses an engine tail gas after-treatment system and method, and belongs to the technical field of engine tail gas treatment.The engine tail gas after-treatment system comprises at least two pre-treatment modules connected in parallel, a shared after-treatment module, a reducing agent supply injection module and a control module; gas outlet ends of all the pre-treatment modules converge to a shared post-treatment module, the shared post-treatment module is sequentially provided with a mixing section and a selective catalytic reduction reactor, the mixing section is provided with a reducing agent injection port, and the selective catalytic reduction reactor is provided with a reducing agent injection port. The reducing agent supply injection module comprises a storage tank and an injection unit connected with the storage tank, an outlet of the injection unit is connected with the reducing agent injection port, and the control module controls the injection amount of the reducing agent according to signals monitored by a temperature sensor arranged on the shared post-processing module and a nitrogen oxide sensor arranged on the mixing section. The device is compact in structure, and efficient cooperative treatment of multi-engine tail gas can be achieved.

In a method for determining nitrogen oxides and ammonia in the exhaust gas of a vehicle, the vehicle having a nitrogen oxide sensor, a lambda signal is received. On the basis of the lambda signal, a lambda value is determined which is representative of the combustion air ratio of the vehicle. A lambda gradient is determined which is representative of whether the lambda value has increased or decreased in comparison with a preliminary value. On the basis of the lambda value and the lambda gradient, it is determined whether a measured value of the nitrogen oxide sensor is representative of nitrogen oxides in the exhaust gas or whether the measured value of the nitrogen oxide sensor is representative of ammonia in the exhaust gas. An information signal is transmitted which comprises information as to whether the measured value of the nitrogen oxide sensor is representative of nitrogen oxides in the exhaust gas or whether the measured value of the nitrogen oxide sensor is representative of ammonia in the exhaust gas.

The utility model discloses a nitrogen oxide sensor production device which is used for fixing a nitrogen oxide sensor and comprises a support module, a first fixing module, a second fixing module and a third fixing module, the first fixing module, the second fixing module and the third fixing module are installed on the support module, and the support module comprises a bottom plate, a supporting plate and a top plate. The supporting plate is fixedly mounted between the bottom plate and the top plate; the first fixing module comprises a first mounting base, a first air cylinder, a first sliding structure, a second sliding structure, a first driving plate and a first limiting plate. According to the oxynitride sensor production device, linkage is conducted through the support module, the first fixing module, the second fixing module and the third fixing module, so that the sensor is fixed and limited in the longitudinal direction and the transverse direction, the stability of the sensor is guaranteed, and the oxynitride sensor production device has the advantages of being stable in structure, high in safety, high in practicability and the like.

This utility model discloses a protective cover for a nitrogen-oxygen sensor, belonging to the field of nitrogen-oxygen sensor technology. The protective cover includes an upper cover and a lower cover rotatably connected to the upper cover, and also includes an arc-shaped rack fixedly connected to the inner wall of the upper cover. By rotating the upper cover, the arc-shaped rack slides within the lower cover, driving a gear to rotate. Simultaneously, the gear's rotation causes a first strip plate on its inner wall to rotate, and the first strip plate abuts against a second strip plate. This rotation of the gear, in turn, drives a bidirectional screw to rotate. The bidirectional screw's rotation brings the first and second clamping plates closer together, clamping and fixing the nitrogen-oxygen sensor. The operation is simple; simply closing the upper and lower covers automatically clamps the nitrogen-oxygen sensor. Compared to traditional threaded rods that drive clamping plates downwards, this method is faster and requires no additional steps.

The invention discloses a vehicle supervision method and device based on OBD data, and the method comprises the steps: marking the OBD data according to the data type of the output data of a downstream nitrogen oxide (NOx) sensor of a selective catalytic reduction (SCR) technology, carrying out the sorting of the marked OBD data according to the time sequence, comparing the data types of two adjacent OBD data, and carrying out the comparison of the data types of the two adjacent OBD data. According to the method, the first conversion proportion information of the number of the abnormal values converted from the abnormal values to the normal values accounts for the abnormal values is determined, according to the counted first conversion proportion information and the preset conversion proportion threshold value information, abnormal OBD judgment is achieved, and then vehicle abnormity supervision is achieved.

The invention discloses a method for monitoring nitrogen oxide emission under all working conditions, and relates to the technical field of data monitoring, and the method comprises the steps: obtaining the current working condition parameters of an engine, the current combustion parameters of the engine and the current probe temperature of a nitrogen oxide sensor; based on the current probe temperature of the nitrogen oxide sensor and a preset probe temperature threshold value, a current working stage is determined, and the current working stage comprises an open-loop stage or a closed-loop stage; if the current working stage is an open-loop stage, the current working condition parameters and the current combustion parameters of the engine are input into a nitrogen oxide pre-estimation model, and the pre-estimated nitrogen oxide content is output; and if the current working stage is a closed-loop stage, inputting the current working condition parameters of the engine, the current combustion parameters of the engine and the current measured value of the nitrogen oxide sensor into the nitrogen oxide correction model, and outputting the corrected nitrogen oxide content.

The utility model discloses a nitrogen oxide sensor mounting and fixing device which comprises a bottom plate, and a first fixing module, a second fixing module, a supporting module and a plurality of welding part fixing modules which are mounted on the bottom plate, the first fixing module comprises an air cylinder, a first sliding structure, a second sliding structure, a first driving plate and a first limiting plate. According to the oxynitride sensor mounting and fixing device disclosed by the utility model, linkage is carried out through the bottom plate, the first fixing module, the second fixing module, the supporting module and the plurality of welding piece fixing modules, so that the sensor is limited and fixed in the longitudinal direction and the transverse direction; and the welding piece and the sensor are limited and fixed during welding, so that welding is facilitated, and the welding device has the advantages of being stable in structure, high in safety and practicability and the like.

The invention relates to a nitrogen-oxygen sensor heating control and heating detection circuit and method in the technical field of nitrogen-oxygen sensor detection, and a heater of a nitrogen-oxygen sensor comprises a lead resistor RL1, a heater resistor RT and a lead resistor RL2 which are sequentially connected in series. The nitrogen and oxygen sensor heating control and heating detection circuit comprises a system power supply, a Power IC, an MCU, a heating control circuit and a heating detection circuit, wherein the system power supply is connected with the MCU through the Power IC. According to the circuit and the method, the nitrogen-oxygen sensor probe can be rapidly, efficiently and stably heated and controlled, and the purpose of accurately controlling the temperature of the nitrogen-oxygen sensor is achieved by measuring the resistance value of the heater resistor in real time.

A method for identifying an unknown fuel used by an internal combustion engine in a vehicle. A set of sensor models is created, each model representing measurements from an onboard sensor for various known fuels. The sensor models are for sensors from various units carried on board the vehicle, such as a crankshaft sensor, NOx sensor, soot sensor, and exhaust gas temperature sensor. While the vehicle is running, measurement data from two or more sensors in the sensor group are acquired and fed to an onboard fuel identification process, which applies statistical analysis to identify the fuel as one of the known fuels.

The utility model discloses a waste incineration power generation flue gas denitration device which comprises a device main body, end plates are arranged at the two ends of the device main body, a partition plate is arranged in the device main body, an induced draft fan is arranged on one side of each end plate, a filter plate is arranged in the device main body, and the partition plate is arranged on the other side of each end plate. An air guide pipe is arranged in the device body, a through hole is formed in the other partition plate, a breathable membrane is arranged in the through hole, an exhaust pipe is arranged on one side of the end plate, a first electromagnetic valve is arranged at the other end of the exhaust pipe, and a backflow pipe is arranged above the device body. According to the denitration device, liquid ammonia and nitric oxide react to achieve denitration, the denitrated flue gas is detected, the flue gas meeting the flue gas emission standard is exhausted from the exhaust pipe, the flue gas not meeting the emission standard is subjected to denitration treatment again from the backflow pipe, and the denitration efficiency is improved. The flue gas denitration effect is improved.

The invention belongs to the technical field of tail gas after-treatment, and discloses a gas taking structure, a nitrogen oxide concentration measuring device and a vehicle. The gas taking structure comprises a cross-shaped gas taking pipe, a first annular pipe and a second annular pipe which communicate with one another, and one end of the cross-shaped gas taking pipe is used for being connected to a nitrogen-oxygen sensor; the end part of the cross-shaped gas taking pipe is fixedly connected with a fixing piece, and the fixing piece is used for being fixedly connected to the inner wall of the exhaust tail pipe; the first annular pipe and the second annular pipe are arranged at an included angle with the cross-shaped gas taking pipe, and the first annular pipe and the second annular pipe are arranged at an included angle; the cross-shaped gas taking pipe, the first annular pipe and the second annular pipe are each provided with a plurality of gas taking holes. According to the gas sampling structure, the nitrogen oxide concentration measuring device and the vehicle provided by the invention, a representative gas sample of the overall NOx concentration in the tail pipe can be collected, and the sampling uniformity and the detection precision are improved.