伴随着世界汽车技术的发展，汽车带来方便的同时也带来了一系列的环境问题，

With the development of automobile technology in the world, automobile brings convenience and brings a series of environmental problems. On the one hand, it is the lack of petroleum fossil energy, and the second is the impact of various car accompanyings on the environment. Under the pressure of demand, we continue to stimulate the continuous progress of automobile technology, and pay more attention to the disadvantages of automobiles while focusing on practicality. <br>Nowadays, the trend of internal combustion engines is mainly based on electronically controlled fuel injection systems. The electronic injection system pays more attention to engine emission problems while preserving the performance of the vehicle. The electronically controlled fuel injection system in the gasoline injection engine adds a three-way catalyst device to convert the exhaust of the automobile engine to a greater extent. This is the current method for purification and conversion efficiency of exhaust emissions in automobiles. The goal of the system's air-fuel ratio control is to control it in a narrow air-fuel ratio range to ensure the efficient operation of the three-way catalyst. <br>The oxygen sensor is the most critical part of the air-fuel ratio control of the EFI gasoline engine. The oxygen sensor is very sensitive to the richness and leanness of the mixture. It is used as a ECU in the closed-loop control to detect the engine exhaust to determine the mixture in the cylinder under this operating condition. The rich and lean problem is conducive to the control of the air-fuel ratio of the car, so as to ensure that the normal operation of the three-way catalyst plays a role in controlling the exhaust emissions of the engine. Therefore, the operating characteristics of the oxygen sensor need to be considered in the EFI gasoline engine. The sensor is added to the closed-loop control as quickly as possible to adopt a heating device. Therefore, the temperature control of the oxygen sensor is the most critical part of the entire electronically controlled fuel injection system.

With the development of the world's automotive technology, the automobile brings convenience but also brings a series of environmental problems, on the one hand, the lack of petroleum fossil energy, on the other is the impact of various car companion organisms on the environment, both advantages and disadvantages, the pressure of social demand constantly stimulate the continuous progress of automotive technology, pay attention to practicality at the same time also bring more attention to the shortcomings of the car.<br>Today's internal combustion engine trend is the main electric fuel injection system, electric injection system in the premise of retaining the performance of the car to pay more attention to the engine emissions problems, the main means is to use the electronic control system to control the engine air-fuel ratio, electric fuel injection system in the electric fuel injection engine for a greater degree of conversion of the car engine exhaust and added a three-way catalytic device, which is currently the car for exhaust emissions purification, conversion efficiency of the most efficient way, Therefore, the air-fuel ratio control target of gasoline electromechanical injection system is to control it in the narrow air-fuel ratio interval to ensure the efficient work of the catalytic converter.<br>Oxygen sensor is the most critical link of air-fuel ratio control of electric fuel engine, oxygen sensor is very sensitive to the concentration of mixture gas is as a closed-loop control ECU detection of engine exhaust to determine the thick problem of mixture in the cylinder under the condition, is conducive to the control of the air-fuel ratio of the car, thus ensuring that the normal operation of the catalytic converter on the engine exhaust emissions play a role, so the electric fuel engine needs to consider the working characteristics of oxygen sensors. It can be seen through research that the device of heating is used to ensure that the oxygen sensor is added to the closed-loop control as soon as possible. Therefore, the temperature control of oxygen sensors is the most critical part of the entire electronically controlled fuel injection system.

With the development of automobile technology in the world, automobile brings convenience, but also brings a series of environmental problems. On the one hand, the lack of petroleum fossil energy; on the other hand, the impact of various companion organisms of automobile on the environment has both advantages and disadvantages. Under the pressure of social demand, it constantly stimulates the continuous progress of automobile technology, and at the same time, it also brings more disadvantages to automobile Attention.<br>Nowadays, the trend of internal combustion engine is mainly electronic fuel injection system, which pays more attention to the emission of engine on the premise of keeping the performance of automobile. The main means is to control the air-fuel ratio of engine by using electronic control system. The electronic fuel injection system of electronic fuel injection gasoline engine is added in order to transform the exhaust of automobile engine to a greater extent At present, the three-way catalytic converter is the most efficient way to purify and transform the exhaust gas. Therefore, the air-fuel ratio control goal of the gasoline electro-mechanical injection system is to control it in a narrow air-fuel ratio range to ensure the efficient operation of the three-way catalytic converter.<br>The oxygen sensor is the most important part of the air-fuel ratio control of EFI gasoline engine. The oxygen sensor is very sensitive to the concentration and dilution of the mixture. It is used as the ECU detection of the engine exhaust in the closed-loop control to judge the concentration and dilution of the mixture in the cylinder under this working condition, which is conducive to the control of the air-fuel ratio of the vehicle, so as to ensure the normal operation of the three-way catalytic converter to the exhaust emission of the engine It plays a control role, so the working characteristics of oxygen sensor should be considered in EFI gasoline engine. Through research, it can be seen that the heating device is adopted to ensure that the oxygen sensor can be added into the closed-loop control as soon as possible. Therefore, the temperature control of oxygen sensor is the most important part of the whole electronic fuel injection system.<br>