sensor introduce

Oxygen sensors are essential components in engines that use three-way catalytic converters to reduce exhaust pollution. Once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the three-way catalyst affects CO The purification ability of HC and NOx will sharply decrease. Therefore, an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust and send a feedback signal to the ECU. The ECU then controls the increase or decrease of the fuel injection amount of the fuel injector, thereby controlling the air-fuel ratio of the mixture near the theoretical value. In order to achieve high exhaust purification rate and reduce carbon monoxide (CO) in the exhaust, an electronic fuel injection vehicle is equipped The composition of (HC) hydrocarbons and (NOx) nitrogen oxides requires the use of a three-way catalytic converter. However, in order to effectively use a three-way catalytic converter, it is necessary to precisely control the air-fuel ratio so that it always approaches the theoretical air-fuel ratio. The catalytic converter is usually installed between the exhaust manifold and the muffler. Oxygen sensors have a characteristic, It outputs a sudden change in voltage near the theoretical air-fuel ratio (14.7:1). This characteristic is used to detect the concentration of oxygen in the exhaust and feedback it to the computer to control the air-fuel ratio. When the actual air-fuel ratio increases, the concentration of oxygen in the exhaust increases, and the oxygen sensor notifies the ECU of the lean state of the mixture (small electromotive force: 0V). When the air-fuel ratio is lower than the theoretical air-fuel ratio, the concentration of oxygen in the exhaust decreases, The status of the oxygen sensor (high electromotive force: 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 correspondingly controls the duration of fuel injection. However, if there is a malfunction in the oxygen sensor that causes the output electromotive force to be abnormal, The (ECU) computer cannot precisely control the air-fuel ratio. Therefore, the oxygen sensor can also compensate for the error in the air-fuel ratio caused by wear and tear of mechanical and other components of the electronic fuel injection system. It can be said that it is the only "intelligent" sensor in the electronic fuel injection system. The function of the sensor is to determine whether there is excess oxygen in the exhaust after engine combustion, that is, the oxygen content, and convert the oxygen content into a voltage signal to transmit to the engine computer, Enable the engine to achieve closed-loop control with the goal of excessive air factor; Ensure that the three-way catalytic converter has the maximum conversion efficiency for hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOX) in the exhaust, and maximize the conversion and purification of emitted pollutants)

Installation position of oxygen sensor

The installation position of the oxygen sensor is in the exhaust pipe. Generally, the first one is installed before the three-way catalytic converter, and the second one is installed after the three-way catalytic converter. One is a sensor for detecting the combustion situation of the engine, and the other is an oxygen sensor for detecting the three-way catalytic converter. The oxygen sensor is seen to have a screw with a wire on the back of the exhaust pipe. Both oxygen sensors work normally at the same time, transmitting the collected information to the ECU and adjusting and controlling the fuel injection quantity from time to time, Ensure the normal operation of the engine. If the oxygen sensor is damaged, during driving, especially within 40 to 60 miles, the engine can be felt to shake during rapid acceleration. The degree of shaking may vary depending on the vehicle model. Note: The thread size of the oxygen sensor for automobiles is generally M18, and it is recommended to install it with a torque of 45 to 55 Nm. In addition, the exhaust pipe and oxygen sensor threads should be carefully removed, Don't be damaged. It can easily handle high temperature environments. When the oxygen sensor works, the temperature can reach 800 ℃. To prevent the oxygen sensor threads from sintering in high temperature environments, anti jamming agents need to be applied. In addition, the exhaust pipes and oxygen sensors of the vehicle are very hot after driving. To prevent burns, it is necessary to wait for the exhaust pipes to completely cool before proceeding to the next step of operation

Cheetah CT5 introduce

Anhui Leopard Automobile Co., Ltd. was established on March 28, 2005. It is the strategic core enterprise of Hunan Changfeng Group (Leopard Automobile) in Chuzhou, and also the second largest vehicle production base after the Changsha headquarters and Yongzhou base. The company currently covers an area of about 466.3 acres, including a construction area of 60000 square meters, a registered capital of 600 million yuan, and 860 employees, including 258 people with college degrees or above, and 260 people with various professional qualifications, There are a total of 57 personnel with intermediate or above professional titles, including 50 technical line engineers and above. Currently, the total assets are about 520 million yuan, with a debt ratio of 46%. Since its establishment, the company has invested a huge amount of money in technological transformation of its original production scale, and has formed an annual production capacity of 10000 units per shift. The main products are the three series of pickup trucks and SUV series, including the Flybell, Flyer, and CT5, covering three levels: low, medium, and high, Capable of industrialization in the research and development, manufacturing, quality assurance, and marketing of pickup trucks and SUVs The overall relocation, upgrading and renovation project of the company was signed on February 22, 2013, and received approval from the Ministry of Industry and Information Technology of China. The project has a total investment of 2921.74 million yuan, covers an area of 985 acres, a total construction area of 193446 square meters, a production value of 9.47 billion yuan, a profit of 758 million yuan, and a tax payment of 330 million yuan. In April 2013, The project will commence construction. It is planned to complete the design, construction, procurement, and manufacturing of equipment and fixtures for the process, civil engineering, and public works within 18 months. Trial production will begin in September 2014, and production will reach the standard in January 2016 In 2013, the company achieved a total output value of 420 million yuan, and in the first quarter of 2014, it achieved a output value of 220 million yuan, a year-on-year increase of 8.5%