13 results about "Nitrogen oxide sensor" patented technology

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 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.

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.

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 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.

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.

To detect when the PM collection device has been removed from the exhaust passage using a common determination method, regardless of the operating range of the internal combustion engine. [Solution] A control device is applied to an internal combustion engine equipped with an exhaust system comprising a PM collection device and an air-fuel ratio sensor located in the exhaust passage. The exhaust system includes a NOx sensor located downstream of the PM collection device in the exhaust passage. During lean active control, the control device calculates the cumulative value of the amount of oxygen supplied to the PM collection device based on the oxygen surplus rate in the lean gas, as an integrated value from the time the output of the air-fuel ratio sensor changes from rich to lean until the output of the NOx sensor exceeds a predetermined value. Based on the amount of oxygen stored in the PM collection device calculated from the amount of oxygen supplied, it is determined whether or not the PM collection device has been removed from the exhaust passage.

The application discloses a kind of for improving NO x Detection precision nitrogen oxide sensor ceramic chip belongs to nitrogen oxide sensor ceramic chip technical field, by parallel placement of monitoring electrode and measuring electrode at the position of same distance from gas diffusion port, can make the gas temperature of two electrodes equal, based on this, monitoring electrode is positioned so that it can be detected at measuring electrode and monitoring electrode equally by the current generated by electron conduction.The current between measuring electrode and reference electrode is the sum of "NO x The current generated by electron conduction", the current between monitoring electrode and reference electrode is "electron conduction generated current", "the current between measuring electrode and reference electrode" minus "monitoring electrode and reference electrode" can eliminate the influence of electron conduction, that is, eliminate the influence of residual O2, measure "NO x Current", to improve the measurement accuracy of NO x Sensor.

Provided is an abnormality determination device capable of ensuring an opportunity for abnormality determination and determining whether an exhaust purification device is abnormal. A control device as the abnormality determination device is applied to an intake and exhaust system. The exhaust purification device reduces nitrogen oxides in exhaust gas using ammonia as a reducing agent. An injector injects urea water. A first sensor is a nitrogen oxide sensor disposed at a position upstream of the injector. A second sensor is a nitrogen oxide sensor disposed at a position downstream of the exhaust purification device. When a purification rate of nitrogen oxides based on the exhaust purification device is low, the control device, during fuel cut, causes the injector to inject an amount of urea water that produces an amount of ammonia capable of being adsorbed in the absence of an abnormality in the exhaust purification device, and then determines that an abnormality is present in the exhaust purification device when the output of the nitrogen oxide sensor is a value equal to or higher than a predetermined value.

The utility model discloses a kind of nitrogen oxide sensor piece core, nitrogen oxide sensor assembly and vehicle, nitrogen oxide sensor piece core includes base, base surface is equipped with air inlet, base inside is provided with decomposition chamber and detection chamber, air inlet, decomposition chamber and detection chamber are sequentially communicated, the inner wall of base at decomposition chamber place is coated with porous catalyst coating, catalyst can react to ammonia gas under high temperature environment, so that ammonia gas is converted into nitrogen and water.Nitrogen oxide sensor piece core of the application sets catalyst in piece core inside, compared with coating catalyst on nitrogen oxide sensor piece core outside, neither affect nitrogen oxide piece core installation, nor need a large number of information samples as experimental data, can be quickly assembled application.

The application discloses a signal tampering monitoring method and device, electronic equipment and a storage medium. The method and device are applied to the electronic equipment of an engine, and specifically, whether a current working condition of the engine meets a preset condition is judged. When the current working condition meets the preset condition, whether the engine is in a reverse drag state is judged. When the engine is in the reverse drag state, urea solution is injected into the SCR equipment according to the SCR temperature. Whether the nitrogen oxide concentration value output by the nitrogen oxide sensor of the engine is greater than a preset concentration threshold value is judged. If the nitrogen oxide concentration value is greater than the preset concentration threshold value, it is determined that the output signal of the nitrogen oxide sensor is tampered. Because the engine does not inject oil when it is in the reverse drag state, and the urea solution of the SCR equipment is continuously injected in the application, the sensor measurement value is greater than the normal value, and based on this, whether the output signal is tampered can be monitored.

This invention discloses a fully automatic optimization method and system for the control performance of a nitrogen oxide sensor, comprising the following steps: hardware connection, installing the nitrogen oxide sensor probe onto the gas distribution platform, connecting the sensor controller to a PC via an interface to establish a data acquisition and control channel; writing initial control parameters, writing the initial control parameters to the nitrogen oxide sensor controller via EEPROM or CAN communication; configuring the initial gas distribution environment, controlling the gas distribution platform to introduce a first stable atmosphere via the PC, enabling the nitrogen oxide sensor to operate under known environmental conditions; starting the nitrogen oxide sensor, starting the sensor via CAN communication and waiting for its operating state to stabilize, so that the key controlled variable approaches the target value; and automatically optimizing the control parameters of the nitrogen oxide sensor control system using a model-free optimization algorithm, breaking through the bottleneck of traditional model dependence, adapting to the characteristics of complex nonlinear and strongly coupled control systems, and possessing stronger universality.