Mercedes-Benz M 447 hLAG User Manual

Table of Contents
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Status September 2003 (EvoBus-Service / AFT) Page: 4 of 83
1 Natural Gas Engine M 447 hLAG 8
2 Functional Description of EGM 11
2.1 Introduction 11
2.2 Torque control 13
2.2.1 Engine protection functions 14
2.2.2 Idling control 27
2.3 Engine state detection 28
2.4 Cylinder filling 28
2.4.1 Throttle valve control 29
2.4.2 Throttle valve diagnosis 30
2.4.3 Turbocharger control 31
2.4.4 Turbocharger diagnosis 34
2.5 Gas injection 35
2.5.1 Gas mass calculation during starting 35
2.5.2 Gas mass calculation in normal case 35
2.5.3 Lambda control 37
2.5.4 Lambda control diagnosis 38
2.5.5 Overrun fuel cut-off (SAS) 38
2.5.6 Switch-on conditions for gas injection 38
2.6 Ignition 40
2.6.1 Firing angle in starting mode 40
2.6.2 Firing angle determination in idling mode 40
2.6.3 Firing angle determination in partial-load and full-load mode 40
3 Electrical Description of EGM 42
3.1 System interface overview 42
3.1.1 Block diagram 42
3.1.2 Connector assignment of EGM and ignition modules 43
3.1.3 Power supply of EGM 45
3.1.4 Power supply of ignition module 46
3.2 Sensor technology 47
3.2.1 Active sensors 47
3.2.2 Special sensors 47
3.2.3 Passive sensors 48
3.3 Digital inputs 49
3.3.1 Terminal 15 49
3.3.2 Terminal 50 49
3.3.3 Service switch Start/Stop 49
3.4 Actuator technology 50
3.4.1 Gas injectors 50
3.4.2 Gas injector actuation 50
3.4.3 Proportional valve actuation 52
3.4.4 Lambda heating actuation 52
3.4.5 High-pressure cut-off valve actuation 52
3.4.6 Ignition module actuation 52

Mercedes-Benz M 447 hLAG Specifications

General

Brand	Mercedes-Benz
Model	M 447 hLAG
Category	Engine
Language	English