1, function: the amount of gas in the cylinder los angeles smog combustion reintroduced to particip

1, function: the amount of gas in the cylinder los angeles smog combustion reintroduced to participate, thereby reducing the maximum temperature within the cylinder, to reduce emissions of NOX. Since the exhaust gas recirculation also reduce engine will power the engine los angeles smog at idle speed, low-speed conditions, such as unstable los angeles smog operation, therefore required by the ECU according to engine operating conditions to control exhaust gas recirculation system work. 2, open-loop control of the EGR system: (1) Structure: (2) How it works: When concrete mixer engine, ECU according to the coolant temperature, throttle opening, speed, starting and other signal control circuit EGR solenoid valve Ground to control the opening degree los angeles smog of the EGR solenoid valve, thereby controlling the EGR valve into the vacuum, i.e., the opening degree of the EGR control los angeles smog valve is, involved in changing the amount of exhaust gas recirculation. Without exhaust gas recirculation conditions are: starting condition, idle condition, warm mechanic conditions, speed of less than 900r / min or higher los angeles smog than 3200r / min. Refers los angeles smog to the amount of exhaust gas recirculation rate EGR gas into the cylinder in the proportion of that: EGR rate = [EGR quantity los angeles smog / (intake air + EGR amount)] 100% in some engines, EGR solenoid valve duty ratio control valve opening degree regulation of the degree of vacuum to the EGR valve opening degree of the EGR control valve, in order to achieve control of the amount of exhaust gas recirculation. In the open-loop control of the EGR system, ECU sensor signals based on the engine operating conditions to determine, according to its corresponding relationship between the EGR rate the speed of memory, and to control the load, and to its control result is not detected. 3, the closed-loop EGR control system: In the closed-loop control of the EGR system, to detect the actual opening degree of the EGR valve as a feedback control signal los angeles smog to a higher control precision. (1) The EGR valve opening degree of the EGR control system is a closed loop feedback signal: EGR valve opening degree sensor: a feedback signal to the ECU of the degree of opening of the solenoid valve. According to this modified ECU solenoid valve opening signal, los angeles smog the EGR rate is maintained at the optimum value. The structure of electricity meter type. (2) using the EGR rate as the closed loop control los angeles smog system, the feedback signal EGR: EGR rate sensor: in the intake manifold is installed on the surge tank, fresh air into the surge tank, through the participation of the recirculated exhaust gas into the EGR solenoid valve is also stabilized press box. Voltage sensor detects the oxygen concentration in the gas chamber and converted into an electrical signal delivered to the ECU, ECU signal correction based on this degree of opening of the solenoid valve, the EGR rate is maintained at the optimum value. 4, overhaul EGR control system: (1) general inspection (2) Check the EGR solenoid valve Cold measured resistance value 33-39Ω. When the solenoid valve is not energized, from blowing through the air intake side of the joint should be smooth, blowing los angeles smog air from the atmosphere through the filter of the barrier should be; when the battery voltage los angeles smog to the solenoid valve is turned on, blowing patency should be the opposite. (3) Check the EGR valve is a manual pump vacuum los angeles smog of about 15kPa is applied los angeles smog to the top of the EGR valve diaphragm, los angeles smog EGR valve should be able to open; degree of vacuum is not applied, EGR valve should be completely closed. For more a more detailed description, please login mixer website: http://www.ynpzh.com.cn/xinwen/992.html
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