178 results about "Nitrogen oxide sensor" patented technology

In a method of controlling an exhaust gas system of an internal combustion engine including a nitrogen oxide reducing catalyst capable of adsorbing nitrogen oxide under a lean atmosphere and a nitrogen oxide sensor disposed downstream of the nitrogen oxide reducing catalyst, the nitrogen oxide reducing catalyst and the nitrogen oxide sensor are disposed in the exhaust gas system operated mainly under a lean condition, respectively. An output value of the nitrogen oxide sensor is compared with a predetermined value, and an operation condition of the internal combustion engine is temporarily changed into a stoichiometric condition or a rich condition, or a fuel is injected upstream of the nitrogen oxide reducing catalyst, so that the nitrogen oxide adsorbed to the nitrogen oxide reducing catalyst is detached or decomposed, and again the internal combustion engine is operated under the lean condition. Deterioration of the catalyst is determined based on Nox amount which is calculated from the sensor output, exhaust has flow amount and vehicle running distance.

A NOx sensor 100 includes a sensor device 110 and a heater 70 capable of heating the sensor device 110. The sensor device 110 includes an inner pump electrode 22 and an outer pump electrode 23 disposed respectively on the inner side and the outer side of a solid electrolyte layer 6. The sensor device 110 detects the concentration of NOx by introducing a gas to be measured into a first inner vacancy 20, pumping out oxygen in the gas to be measured from the inner pump electrode 22 to the outer pump electrode 23, introducing the gas to be measured, from which the oxygen has been pumped out, into a second inner vacancy 40, reducing the NOx in the gas to be measured, to thereby generate oxygen, and detecting the generated oxygen. A characteristic stabilizing layer 24 covers the outer pump electrode 23 and is made of a porous body with a thickness of 10 to 200 μm and a thickness variation of 20% or less.

The invention provides a diesel engine tail gas after-treatment system. The diesel engine tail gas after-treatment system comprises a SCR catalyst, a urea pump, a urea tank, a urea nozzle, a control unit, a temperature sensor and a nitric oxide sensor, and further comprises a waste gas temperature adjusting device for heating control of the temperature of exhausted tail gas; the urea pump is integrated on the urea tank, and is connected with the urea nozzle through a urea solution pipeline; and the urea nozzle is mounted on an exhaust pipe. The diesel engine tail gas after-treatment system is provided with the waste gas temperature adjusting device, and is provided with an internal heating body for heating the tail gas to keep the temperature of the tail gas in a set range so as to always keep the catalytic reaction efficiency on a higher level. The diesel engine tail gas after-treatment system can output different heating powers for different working conditions to realize instant and different active control of the exhaust temperature so as to adapt to the demands on different working condition points through controlling such parameters as the electrifying time and frequency of the heating body.

A vehicle control system regulates oxides of nitrogen levels in vehicle emissions. Recirculation of exhaust gas in an engine is controlled with an exhaust gas regulator valve and / or a cam phaser. An oxides of nitrogen sensor determines the level of oxides of nitrogen levels in the exhaust gas and communicates the information to a vehicle controller. The controller determines if the oxides of nitrogen levels are within a predetermined threshold according to a lookup table. The controller adjusts the valve and / or cam phaser if the oxides of nitrogen levels are not within the threshold.

A purification device is disclosed for a reduction in the amount of particulate matter and nitrogen oxides. The device comprises a catalytic diesel particulate filter (CDPF), a differential pressure transducer, a rearward injector, diesel fuel decomposition catalysts (DFC), nitrogen oxides absorption catalysts (de-NOx catalysts), a nitrogen oxide sensor and a controlling device.

The invention discloses a ceramic chip of a NOx sensor. An oxygen pump anode covered with a protective layer on the surface is arranged on a first-layer membrane, an acquisition cavity is formed on the oxygen pump anode and the first-layer membrane, second to fourth through holes are formed in a second-layer membrane, a first diffusion barrier is formed in the second through hole and divides the second through hole into a first measurement chamber and a buffer cavity, a main oxygen pump cathode is arranged in the first measurement chamber, a second diffusion barrier is arranged between the second through hole and a third through hole, the third through hole is a second measurement chamber, an auxiliary pump cathode is arranged in the second measurement chamber, a third diffusion barrier isarranged between the third through hole and the fourth through hole, the fourth through hole is a third measurement chamber, a measurement electrode covered with a protective layer on the surface isarranged in the third measurement chamber, a reference channel is formed in a third-layer membrane, a reference electrode covered with a protective layer on the surface is arranged in the reference channel, a heating electrode wrapped in a heating electrode insulating layer is arranged between the fourth-layer membrane and a fifth-layer membrane, an outer lead of the heating electrode penetrates through the fifth-layer membrane to be located on the lower surface of the fifth-layer membrane, and a stress release hole filled with heating electrode insulating layer slurry is formed in the fifth-layer membrane.

A trouble diagnosis device and method for an NOx sensor for determining abnormality of an NOx sensor used in an exhaust gas purification system. The device can perform a trouble diagnosis without forcedly creating a diagnosis mode during operation of an internal combustion engine and without deterioration of drivability or fuel consumption. The device detects the time-lapse variation of the exhaust NOx flow rate suitable for diagnosis in a normal operation mode and determines whether the NOx sensor responds with following this variation.

The invention discloses a nitrogen oxide sensor ceramic chip. The nitrogen oxide sensor ceramic chip comprises a six-layer substrate laminated from top to bottom. The NOX catalytic decomposition witha nitrogen oxygen sensor and measurement regions are designed as a three-dimensional porous structure, which greatly increases the contact area between the gas and the electrode. The close combinationof the interface of each functional layer material solves the problem of heat uniformity and stability of the test area, and the measurement of the concentration of NOX gas is more accurate. The structure of the nitrogen oxide sensor ceramic chip improves the heat uniformity and stability of the test area of the chip, and also improves the structural strength of the chip to a certain extent. Moreover, the contamination of the test electrode by the volatilization of the catalytically inactive metal Au during high-temperature sintering can be effectively prevented. The measurement accuracy is higher. The production process is simple. The production is easy. The service life is long.

A system including a sampling flute is provided. The sampling flute defines a conduit therein. The sampling flute includes a plurality of holes configured for allowing passage of an exhaust gas flow therethrough. The system also includes a hood provided on the sampling flute. The hood is configured to enclose a nitrogen oxide sensor therein. The hood includes an inlet in fluid communication with the sampling flute. The hood also includes an outlet positioned opposed to the inlet. The hood is configured to cause the exhaust gas flow to impact a side of the nitrogen oxide sensor.