What is the function of oxygen sensor? Is there a relationship between automobile fuel consumption and oxygen sensor?

Oxygen sensor is actually a tool to detect the oxygen content of automobile exhaust. It is divided into upstream sensor and downstream sensor. The two sensors are respectively installed at the two ends of the three-way catalyst (as shown in the above figure). The upstream sensor monitors the oxygen content of tail gas and transmits it to ECU to adjust the air-fuel ratio signal; The downstream sensor is responsible for monitoring the working state of the three-way catalyst and adjusting the air-fuel ratio according to the working state of the three-way catalyst. Simply put, the current sensor finds that the air-fuel ratio is adjusted by the high oxygen content of the three-way exhaust gas, because the high oxygen concentration affects the three-way conversion efficiency! Oxygen sensor is an important component installed on the exhaust pipe of automobile. From its installation location and name, it can be seen that the main function of oxygen sensor is to obtain relevant data of oxygen concentration in automobile exhaust and feed these data back to the vehicle's brain-computer on-board computer (ECU).

With the decline of engine power, it is actually a process of power consumption, which is close to the use of many electrical appliances; Such as TV, refrigerator, etc. , cooling efficiency decreased (excluding Freon). In order to achieve the cooling effect, the compressor must be started more frequently, which naturally consumes more power! The same is true of car engines. As the power decreases, you have to spray more oil to get the previous power, so the car always consumes more and more oil with use! After the on-board computer obtains these data, combined with the data of other sensors on the car, it can judge whether the engine is working in the best state. If the working condition is not good, the on-board computer will adjust the engine to a better condition. Because there are many toxic and harmful substances in automobile exhaust and the temperature is very high, the oxygen sensor needs to be replaced or cleaned after a certain period of time after working in such an environment for a long time, otherwise it will malfunction, leading to data errors in the on-board computer. These wrong data will cause various bad symptoms of the engine, and the increase of fuel consumption is only one of the possible symptoms.

This is a practical state, that is to say, with the use day after day, the power of the engine shows a downward trend. Even if the problems such as carbon deposition and oxygen sensor are eliminated, the power of the engine is still declining, which is actually related to the aging of the engine; With the continuous use of the machine, the gap between components will continue to increase, leading to the increase of redundant vibration and noise, followed by the decrease of air tightness and power; The all-aluminum engine is the most obvious in this respect, because the expansion coefficient of aluminum alloy is larger and the margin between parts is larger! It can be seen from the function of the oxygen sensor that if there is no fault in the component, it has nothing to do with the fuel consumption of the vehicle. This does not mean that the oxygen sensor will immediately play the role of fuel consumption. If the high fuel consumption is not caused by the failure of the oxygen sensor, replacing the oxygen sensor has no effect on the fuel consumption. In addition, the working life of oxygen sensors is usually longer. If it is dirty, it can still be used.

The oxygen sensor is used to detect the residual oxygen content in the exhaust gas, and the output voltage signal is used for closed-loop control to make the engine reach the ideal air-fuel ratio. Damage to the oxygen sensor will lead to poor engine idle speed, poor acceleration, excessive displacement and high fuel consumption. The fuel consumption of cars is getting higher and higher, which is not necessarily related to oxygen sensors. There are many reasons that affect automobile fuel consumption. Driving habits. Many friends have joined the biker group. In the same car, some people have low fuel consumption, while others have high fuel consumption. The fuel consumption of cars is getting higher and higher, largely because of our intense driving and the increase in braking times. Spark plugs. If the spark plug is not replaced regularly, the ignition part of the spark plug will be corroded too many times, which will affect the ignition effect and lead to cylinder loss. The throttle valve is not cleaned regularly. The increase of carbon deposition in throttle affects the intake of automobile. The tire pressure is too low, and the tire pattern does not match. Too much or too little oil. Three-way catalysis is not clean. There are many reasons that affect automobile fuel consumption, and elimination can be used to solve the problem of increasing fuel consumption.