Biên soạn tài lệu tham khảo môn thực hành động cơ diesel phần 2
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COMPILING THE DIESEL ENGINE REFERENCE MATERIAL PART 2
Teacher: CHÂU QUANG HẢI
Student: NGUYỄN BẬC HƯNG
DIỆP CẨM HÙNG
ID: 14145104
ID: 14145101
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OUTLINE
Chapter 1: Start – assist systems
Chapter 2: Minimizing emissions inside of the engine
Chapter 3: Exhaust – gas treatment
Chapter 4: Electronic Diesel Control (EDC)
Chapter 5: Electronic Control Unit (ECU)
Chapter 6: Sensors
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Chapter 1: START – ASSIST SYSTEMS
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FUNCTION
To increase starting comfort and help the engine to run smoothly and with minimal emissions after
starting and in the warm – up period.
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OPERATING PHASES
•
Preheating phase
•
Standby heating phase
•
While engine speeds up
•
Post – heating phase
•
Intermediate heating phase
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CLASSIFICATIONS
There are two types of preheating systems:
•
Conventional preheating system
•
Low – voltage preheating system
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CLASSIFICATIONS
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Chapter 2: MINIMIZING EMISSIONS INSIDE OF THE ENGINE
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IMPACTS ON POLLUTANT EMISSIONS
•
Combustion process
•
Torque
•
Engine speed
•
Fuel
•
Fuel consumption
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COMBUSTION PROCESS
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SOLUTION
There are some solutions:
•
Homogeneous combustion process
•
The Diesel fuel injection control
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THE DIESEL FUEL INJECTION CONTROL
•
Start of injection and delivery
•
Injected fuel quantity
•
Injection duration
•
Injection rate
•
Injection pressure
•
Nozzle and holder assembly
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Chapter 3: EXHAUST – GAS TREATMENT
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NOx STORAGE CATALYST (NSC)
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OPERATION
There are two steps:
•
NOx storage
•
NOx removal and conversion
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NOx STORAGE
It takes place based on the following equation:
Barium Carbonate (BaCO3) is the storage material
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NOx REMOVAL AND CONVERSION
It happens during two phases. They based on the following equations:
Phase 1:
Phase 2:
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SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES (SCR)
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SYSTEM OVERVIEW
•
To minimize the NOx in the downstream of the engine
•
NH3 is the main reducing agent which is produced from Urea ((NH 2)2CO)
•
The urea/water solution will be obtainable under the brand name of AdBlue
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SYSTEM OVERVIEW
•
To precisely meter the reducing agent. Bosch invented DENOXTRONIC 1
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OPERTION
First, NH3 is formed through the following equations.
Phase 1:
Phase 2:
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OPERTION
Then, the conversion process will take place according to the following equations.
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DIESEL PARTICULATE FILTER (DPF)
Function:
To remove soot particle from exhaust gas
Types:
•
Ceramic particulate filter
•
Particulate filters made of sintered metal
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DIESEL PARTICULATE FILTER (DPF)
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OPERATION
It takes two phases:
•
Storage the diesel particulate in the channel wall
•
Regeneration (remove the stored particulate)
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