Detailed explanation of the national sixth b configuration of faw autonomous engine aftertreatment system

Brief introduction: In order to meet the needs of the national sixth technology, we will continue to give lectures on the latest national sixth technology and new parts of Wei Chai, Sinotruk and natural gas systems. Pay attention to the Three Tombs in Shenzhen, and you can find them by searching in historical materials. Although many masters spit out the technical updates in the background too fast to keep up with the pace of the market, they are still unceremoniously urging more tightly. Today, I will continue to share with you the knowledge of FAW's independent system "National Six". Although the future is difficult, now you are at the forefront of your efforts. I think I can share my circle of friends with more masters! Introduction to the configuration of national sixth B 1 of FAW autonomous system. Engine parts: 1. Electronically controlled EGR air flowmeter (intake venturi): the function of EGR system is to mix exhaust gas with fresh air, reduce the combustion temperature in the machine and reduce Nox；; 2. Venturi tube (intake Venturi tube): the airflow of the air flowmeter (Venturi tube) forms a cross section and forms a pressure difference; The air flowmeter calculates the air mass flow according to the pressure difference and the measured temperature, which provides data support for EGR closed-loop control. 3. Electronic throttle: the throttle is used to adjust the air intake to ensure the EGR rate under various working conditions; Through throttle calibration, in-cylinder post-injection calibration and exhaust pipe insulation measures, the working temperature requirements of DOC working medium are ensured. Second, the post-processing part: 1. DOC2.DPF3.SCR4.ASC III. Sensor configuration of post-processing part: 1. Control strategy of engine intake system: (1) theoretical air-fuel ratio of diesel engine (A/F): 14.5 excess air coefficient λ (intake). (2) In different situations, in order to ensure that the value of excess air coefficient is basically consistent with the set value, ECU controls the intake air volume by controlling the electronic throttle valve and EGR valve, so that the input value is consistent with the bench calibration value; (3) Calibrating the smoke limit according to the input value and controlling the fuel injection quantity; (4) The control function of the intake system controls the throttle and EGR according to different thermal management modes, so that the intake air can meet the exhaust temperature requirements of aftertreatment. (By closing the throttle, the exhaust temperature of engine exhaust can be increased) 2. Control mode of electronic throttle and EGR valve: (1) open-loop control/direct adjustment of opening (according to rotation speed and injection quantity); (2) Based on closed-loop control/target λ control. 3. The sixth independent engine adopts mechanical supercharger, which has no supercharging control function, and adopts non-VGT supercharger, which greatly saves the upgrade cost. Introduction of 1 engine electronic control equipment. Definition of pin 2 of national six-lamp ECU. Crankshaft position sensor (3602 120-K00 1/A Hengsheng Hall type) 3. Camshaft position sensor) 3602130-a11/a _ dh/dk. Intake air temperature and pressure sensor assembly (3602 105-32FY/C sensor) V. EGR temperature sensor assembly (3602 145-32FY/B sensor) VI. Coolant temperature sensor assembly a sensor (VII. Exhaust gas recirculation valve VIII. Refer to the electronic control unit Pump/Fuel Gauge Unit XIII and Rail Pressure Sensor XIV. About 6 maintenance knowledge of more countries, you can search and query in 3 gazelle maintenance materials in Shenzhen!