奔驰汽车Booster 压力控制培训课件.ppt

* 5/1 Charge air cooler for left cylinder bank 5/2 Charge air cooler for right cylinder bank 12 Intake manifold 110a Left exhaust gas turbocharger 110b Right exhaust gas turbocharger 110/1 Intake line/air cleaner housing 110/6 Boost pressure pipe 110/7 Hose piece with hose clamp 110/8 Y-connecting piece 121/1 Air cleaner for left cylinder bank 121/2 Air cleaner for right cylinder bank M16/6 Throttle valve actuator B Exhaust D Clean air (downstream of air cleaner) E Charge air M275发动机涡轮增压系统 M275 Engine Boost control function Y31/5: Boost pressure control pressure transducer 110/3: Boost pressure control valve with vacuum cell 110a: Left Turbocharger 110b: Right Turbocharger M275 Engine Boost control function Y31/5: Boost pressure control pressure transducer 110/3: Boost pressure control valve with vacuum cell 110a: Left Turbocharger 110b: Right Turbocharger 22: Vacuum reservoir Y31/5: Boost pressure control pressure transducer Y32: Air pump switchover valve 110/3: Boost pressure control valve with vacuum cell Y101: Divert air switchover valve 110/4: Deceleration valve 128: Check valve (vacuum) 126/1: Left shutoff valve air injection 126/2: Left shutoff valve air injection 检查口 M275 Engine Boost control function 发动机控制单元, 通过增压压力控制转换阀(Y31/5)控制发动机增压压力. 增压压力控制转换阀(Y31/5)是通过一个30 Hz 的PWM信号控制, 信号控制周期是在 5 - 95 % 之间. 体制压力通过两个涡轮增压器(110a/110b)获得, 并提供给真空单元 (110/3). 真空单元推动控制杆(110/3b)增加boost pressure control valves (110/3a) 的开度, 使得更多的废气未通过涡轮叶片直接排放出去. 从而达到控制增压压力的目的. 限制增压压力是通过上下游压力传感器B28/4,5,6)的信号, 并依据map得到控制 同时发动机的负荷是通过节气门下游压力传感器(B28/7). 加以监测. M275 Engine Boost control function Y31/5: Boost pressure control pressure transducer function Y31/5真空单元与大气相通 (a), 所有增压的压力无法影响到真空单元(110/3), 那么boost pressure control valves (110/3a)处于关闭状态, 同时全部废气将推动增压器的叶片旋转, 从而保证最大的压气压力.此时吸入的空气(D)将被完全加压(E). 压力控制功能是可以通过 STAR Diagnosis 进行分析的, 可以通过“Boost pressure control adapted” 将数据读出. 当更换了发动机控制单元, 任意的增压器那么将通过STAR Diagnosis 进行adaptat