Biên soạn tài lệu tham khảo môn thực hành động cơ diesel phần 2

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 C

COMPILING THE DIESEL ENGINE REFERENCE

MATERIAL PART 2

WELCOME TO OUR PRESENTATION

Teacher: CHÂU QUANG HẢI

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 1: START – ASSIST SYSTEMS

To increase starting comfort and help the engine to run smoothly and with minimal emissions after starting and in the warm – up period

OPERATING PHASES

• Preheating phase

• Standby heating phase

• While engine speeds up

• Post – heating phase

There are two types of preheating systems:

• Conventional preheating system

• Low – voltage preheating system

CLASSIFICATIONS

Chapter 2: MINIMIZING EMISSIONS INSIDE OF THE ENGINE

IMPACTS ON POLLUTANT EMISSIONS

• Combustion process

• Torque

• Engine speed

• Fuel

COMBUSTION PROCESS

There are some solutions:

• Homogeneous combustion process

• The Diesel fuel injection control

THE DIESEL FUEL INJECTION CONTROL

• Start of injection and delivery

• Injected fuel quantity

• Injection duration

• Injection rate

Chapter 3: EXHAUST – GAS TREATMENT

NOx STORAGE CATALYST (NSC)

NOx STORAGE

It takes place based on the following equation:

Barium Carbonate (BaCO3) is the storage material

NOx REMOVAL AND CONVERSION

It happens during two phases They based on

the following equations:

Phase 1:

Phase 2:

SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES

(SCR)

SYSTEM OVERVIEW

• To minimize the NOx in the downstream of

the engine

• NH3 is the main reducing agent which is

produced from Urea ((NH2)2CO)

• The urea/water solution will be obtainable

under the brand name of AdBlue

SYSTEM OVERVIEW

• To precisely meter the reducing agent

Bosch invented DENOXTRONIC 1

Then, the conversion process will take place

according to the following equations

DIESEL PARTICULATE FILTER (DPF)

Function:

To remove soot particle from exhaust gas

Types:

• Ceramic particulate filter

• Particulate filters made of sintered metal

DIESEL PARTICULATE FILTER (DPF)

It takes two phases:

• Storage the diesel particulate in the channel wall

• Regeneration (remove the stored particulate)

MEASURES FOR REGENERATION

• Additive system

• Catalyzed Diesel Particulate Filter (CDPF)

• CRT® system

DIESEL OXIDATION CATALYST (DOC)

Functions:

• Reduction in CO and HC emissions

• Oxidation of NO to form NO2

• Catalytic burner

Chapter 4: ELECTRONIC DIESEL CONTROL (EDC)

• Fuel – Injection control

• Lambda closed – loop control for passenger – car

diesel engines

• Control and triggering of the remaining actuators

• Data exchange with other systems

FUEL – INJECTION CONTROL PROCESS

• Start quantity

• Idle – speed control

• Maximum – rpm control

• Intermediate – speed control

• Vehicle – speed controller (cruise control)

FUEL – INJECTION CONTROL PROCESS

• Active – surge damping

• Injected – fuel – quantity limit

• Altitude compensation

• Cylinder shutoff

• Vehicle – speed limiter

• Injector delivery compensation, etc

• Fuel – Injection control

• Lambda closed – loop control for passenger – car

diesel engines

• Control and triggering of the remaining actuators

• Data exchange with other systems

LAMBDA CLOSED-LOOP CONTROL FOR PASSENGER-CAR DIESEL ENGINES

• Application

• Basic function

• Lambda-based EGR control

• Full-load smoke limitation

• Detection of undesirable combustion

EXAMPLE OF RECIRCULATION

• Fuel – Injection control

• Lambda closed – loop control for passenger – car

diesel engines

• Control and triggering of the remaining actuators

• Data exchange with other systems

CONTROL AND TRIGGERING OF THE REMAINING ACTUATORS

• Auxiliary coolant heating

• Intake-duct switch-off

• Boost-pressure control

• Fan triggering

INTAKE-DUCT SWITCH-OFF

• Fuel – Injection control

• Lambda closed – loop control for passenger – car

diesel engines

• Control and triggering of the remaining actuators

• Data exchange with other systems

DATA EXCHANGE WITH OTHER SYSTEMS

• Serial data transmission (CAN)

• Applications in the vehicle

MESSAGE FORMAT

Chapter 5: ELECTRONIC CONTROL UNIT (ECU)

Chapter 6: SENSORS

Automotive applicationSensor register operating states and setpoint values They convert physical quantities or chemical quantities into electric signal

ENGINE-TEMPERATURE SENSOR

MICROMECHANICAL PRESSURE SENSORS

VERSION WITH THE REFERENCE VACUUM ON

THE COMPONENT SIDE

HIGH-PRESSURE SENSORS

• Application

- Diesel rail-pressure sensor

- Gasoline rail-pressure sensor

- Brake-fluid pressure sensor

HIGH-PRESSURE SENSORS

INDUTIVE ENGINE-SPEED SENSORS

• Applications

- Measure engine rpm

- Define crankshaft position

INDUTIVE ENGINE-SPEED SENSORS

LSU4 PLANAR BROAD-BAND LAMBDA OXYGEN SENSOR

• Application

- Define oxygen concentration in exhaust-emission to

maintain Lambda equal 1

LSU4 PLANAR BROAD-BAND

LAMBDA OXYGEN SENSOR

FUEL-LEVEL SENSOR

• Application

- Register the level of the fuel in tank and send the

signal to ECU or to the display device

FUEL-LEVEL SENSOR

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