What does an oxygen sensor mean and what is an oxygen sensor?

Oxygen sensors are an essential element in engines that use three-way catalytic converters to reduce exhaust pollution. Because once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for Co, HC and NOx will decrease sharply, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection volume of the injector, so as to control the air-fuel ratio of the mixture near the theoretical value.

Details: In order to obtain a high exhaust purification rate and reduce the composition of carbon monoxide, (HC) hydrocarbons and (NOX) nitrogen oxides in the exhaust, the EFI truck must use a three-way catalytic converter. However, in order to use the three-way catalytic converter effectively, the air-fuel ratio must be precisely controlled so that it is always close to the theoretical air-fuel ratio.

The catalytic converter is usually installed between the exhaust manifold and the muffler. The oxygen sensor has the characteristic that the voltage it outputs abruptly around the theoretical air-fuel ratio (:1).

This characteristic is used to detect the concentration of oxygen in the exhaust gas and feedback to a computer to control the air/fuel ratio. When the actual air-fuel ratio becomes high, the concentration of oxygen in the exhaust gas increases, and the oxygen sensor notifies the ECU of the state of the dilute mixture (small electromotive force: O volts).

When the air-fuel ratio is lower than the theoretical air-fuel ratio, the concentration of oxygen in the exhaust gas decreases, and the status of the oxygen sensor (large EMF: 1 volt) notifies the (ECU) computer.

The ECU determines whether the air-fuel ratio is low or high based on the difference in electromotive force from the oxygen sensor and controls the duration of the injection accordingly. However, if the oxygen transmitter is faulty and the output electromotive force is abnormal, the (ECU) computer will not be able to accurately control the air/fuel ratio. Therefore, the oxygen sensor can also compensate for the error of the air-fuel ratio caused by the wear and tear of other parts of the EFI system.

It can be said that it is the only sensor in the EFI system that has "intelligence".

The function of the sensor is to determine whether there is excess oxygen in the exhaust gas after the engine combustion, that is, the oxygen content, and convert the oxygen content into a voltage signal and transmit it to the engine computer, so that the engine can realize the closed-loop control with the goal of excess air factor; Ensure that the three-way catalytic converter has the maximum conversion efficiency for the three pollutants in the exhaust gas, namely hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxide (NOX), and maximize the conversion and purification of the emitted pollutants.

Oxygen sensors are an essential element in engines that use three-way catalytic converters to reduce exhaust pollution. Because once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for Co, HC and NOx will decrease sharply, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection volume of the injector, so as to control the air-fuel ratio of the mixture near the theoretical value.

The automotive oxygen sensor is the key feedback sensor in the EFI engine control system, and is the key component to control the exhaust emissions of the vehicle, reduce the environmental pollution of the vehicle, and improve the fuel combustion quality of the automobile engine.

The automotive oxygen sensor is the key feedback sensor in the EFI engine control system, and is the key component to control automobile exhaust emissions, reduce environmental pollution of automobiles, and improve the fuel combustion quality of automobile engines.

The oxygen sensor is a measuring element that uses ceramic sensing elements to measure the oxygen potential in various heating furnaces or exhaust pipes, calculates the corresponding oxygen concentration by the principle of chemical equilibrium, monitors and controls the combustion air-fuel ratio in the furnace, and ensures that the product quality and exhaust emissions meet the standards.

The oxygen sensor is used to electronically control the feedback control system of the fuel injection device, which is used to detect the concentration of oxygen in the exhaust and the concentration of the air-fuel ratio, monitor the combustion of the theoretical air-fuel ratio (:1) in the engine, and transmit feedback signals to the computer.

There is a tubular oxygen sensor core element in the oxygen sensor, and a chip oxygen retardation sensor chip

1. The oxygen sensor is a standard configuration on the car, which is a measuring element that uses ceramic sensitive elements to measure the oxygen potential in the exhaust pipe of the car, calculates the corresponding oxygen concentration by the principle of chemical equilibrium, and monitors and controls the combustion air-fuel ratio to ensure product quality and exhaust emission standards;

2. The oxygen sensor is widely used in the early slip control of the atmosphere of various coal combustion, oil combustion, gas combustion, etc., it is the best combustion atmosphere measurement method at present, with the advantages of simple structure, rapid response, easy maintenance, convenient use and accurate measurement;

3. The use of the sensor for combustion atmosphere measurement and control can not only stabilize and improve product quality, but also shorten the production cycle and save energy.

Generally, the purpose of the front oxygen sensor is to detect the oxygen content in the exhaust gas of the car, determine the concentration or dilute of the engine mixture by detecting the oxygen content, and then the engine control unit changes the fuel injection time according to the signal. The ultimate goal is to better control emissions, so that the emission standards can be met and fuel efficiency at the same time.

1. The function of the oxygen sensor is: to determine whether there is excess oxygen in the exhaust gas after the combustion of the large engine of infiltration, and convert the oxygen content into a voltage signal and transmit it to the engine computer, so that the engine can realize the closed-loop control with the goal of excess air factor; Ensure that the three-way catalytic converter has conversion efficiency for the three pollutants in the exhaust gas, namely hydrocarbons, carbon monoxide and nitrogen oxides, and carry out the conversion and purification of the emitted pollutants.

2. The oxygen sensor uses the NERNST principle. The core element is a porous ZRO2 ceramic tube, which is a solid electrolyte with porous platinum (Pt) electrodes sintered on both sides. At a certain temperature, due to the different oxygen concentrations on both sides, the oxygen molecules on the high concentration side (4 on the inner side of the ceramic tube) are adsorbed on the platinum electrode and combine with electrons (4E) to form oxygen ions O2-, so that the electrode is positively charged, and the O2- ions migrate to the low oxygen concentration side (exhaust gas side) through the oxygen ion vacancy in the electrolyte, so that the electrode is negatively charged, that is, the potential difference is generated.

3. Oxygen sensor is an indispensable component in engines that use three-way catalytic plexus closed-vertical converters to reduce exhaust pollution. Because once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for Co, HC and NOx will decrease sharply, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection volume of the injector, so as to control the air-fuel ratio of the mixture near the theoretical value.

What is the function of an oxygen sensor? The functions of the oxygen sensor are: 1. Determine whether there is excess oxygen in the exhaust gas of the engine after combustion, convert the oxygen content into a voltage signal and transmit it to the engine computer, so that the engine can realize the closed-loop control with the goal of excess air factor; 2. Ensure that the three-way catalytic converter has conversion efficiency for the three pollutants of hydrocarbons, carbon monoxide and nitrogen oxides in the exhaust, and carry out the conversion and purification of the discharged pollutants.

Oxygen sensors are used in petroleum, chemical, coal, metallurgy, papermaking, fire protection, municipal, pharmaceutical, automobile, gas emission monitoring and other industries. The faults of the oxygen sensor are: oxygen sensor poisoning, carbon deposits, oxygen sensor ceramic fragmentation, heater resistance wire burning, and oxygen sensor internal circuit disconnection.