Principle and maintenance bibliography of electronic control system of automobile engine

The first chapter is the principle and maintenance of sensors in automobile electronic control system.

Section 1 Sensor Overview 1

I. Composition of sensor 1

Second, the classification of sensors 1

Three. Type 2 of vehicle sensor

Fourth, the development trend of sensors 3

Section 2 Detection of Air Flow Sensor 3

I. Functions and types of air flow sensors 3

Secondly, the blade flow sensor 4

Three. Vortex air flow sensor 4

Four, hot wire air flow sensor 10

V. Hot Film Air Flowmeter 12

Temperature sensor in the third quarter 13

I. Functions of Temperature Sensor 13

Second, the classification of temperature sensors 14

Three, thermistor temperature sensor 14

IV. Thermosensitive Ferrite Temperature Sensor 16

Verb (abbreviation of verb) Maintenance of temperature sensor 17

Section 4 Maintenance of Throttle Position Sensor 19

I. Functions of Throttle Position Sensor 19

Second, the throttle position sensor model 19

Three. Contact throttle position sensor 19

4. Linear Variable Resistance Throttle Position Sensor 20

Verb (abbreviation of verb) combines throttle position sensor 20

Detection of intransitive verb sensor 22

Section 5 Detection of Absolute Pressure Sensor of Intake Manifold 23

I. Detection of Semiconductor Varistor Sensor 24

Two. Absolute pressure sensor detection of vacuum bellows intake manifold 27

Three. Detection by atmospheric pressure sensor 29

Section 6 Maintenance of Position Sensor 29

I. Classification of crankshaft and camshaft position sensors 29

Two. Detection of magnetic pulse crankshaft and camshaft position sensor 30

3. Photoelectric Crankshaft Position Sensor 34

Four. Detection of Hall Crankshaft Position Sensor 37

Verb (abbreviation of verb) Beijing Cherokee crankshaft position and camshaft position sensor 40

Six, Jetta and Santana car magnetic induction position sensor and Hall position sensor 43

Section 7 Detection of Engine Speed Sensor 45

A, electromagnetic induction engine speed sensor detection 45

Second, the reed switch engine speed sensor detection 48

Thirdly, other forms of engine speed sensor 48.

Section 8 oxygen sensor 49

I. Function of oxygen sensor 49

Second, zirconia oxygen sensor (voltage type) 49

Three, titanium oxide oxygen sensor (resistor) 52

Four. Use of oxygen sensors 53

Verb (abbreviation of verb) Detection of oxygen sensor 54

Section 9 Knock Sensor 55

A, engine knock detection method 55

Second, the magnetostrictive knock sensor 55

3. Piezoelectric knock sensor 56

Four, knock sensor detection 57

Section 10 switch control signal 58

I. battery voltage signal 58

Second, the ignition switch signal 59

Three. Detection of the start signal 59

Four, neutral start switch signal NSW detection 60

Verb (abbreviation of verb) Air conditioning switch signal of air conditioner 60

Section 11 Typical Fault Case Analysis 6 1

Case 1: The engine of Geely Freedom Ship can't start 6 1.

Case 2, Passat B5 1.8T automobile engine failed to start 62.

Case 3, Chery Tiggo engine failure warning light is on, and the engine speed is 63.

Case 4, the engine of Hongqi car is difficult to start.

Case 5: The coolant temperature of the golf engine is too low, and the electronic fan rotates for too long.

Case 6, Nissan Teana exhaust pipe "fired", the speed was too low 66.

Case 7. Elantra VVT is difficult to start and cannot be accelerated.

Case 8. Shanghai Buick Century Car's idle speed jitter in 2002 was 69.

Case 9: Shanghai Santana 3000 has unstable idle speed and weak acceleration.

Case 10. The engine of Southeast Leading Car can't start 7 1.

Case 11, Shanghai Passat GLi car acceleration is not smooth 72

Chapter II Structure and Maintenance of Automobile Electronic Control Unit 75

Section 1 Structure of Automobile ECU 75

I. Input circuit 77

Second, the single chip microcomputer 78

III. Output Circuit 8 1

Working process of automobile ECU in the second quarter 8 1

Section 3 Composition and Work of Vehicle ECU Power Circuit 82

I. Power supply circuit without stepping motor 82

Second, the power supply circuit of ECU equipped with stepping motor 83

The fourth quarter automobile ECU connection circuit maintenance 83

A, Santana 2000GSi car engine ECU structure characteristics 83

Second, Santana 2000GSi automobile engine ECU

Maintenance of production line 85

Section 5 Typical Fault Case Analysis 89

Case 1: The idle speed of Volvo 940 engine is too high, and the power is less than 89.

Case 2: Irregular flameout of Nissan Fengdu A32 engine 90

Case 3: After mazda 6 accident maintenance, the engine idling is unstable, and the power is less than 9 1.

Chapter III Maintenance of Fuel Supply System of Gasoline Engine 93

Section 1 Composition of Fuel Injection System of Automobile Engine 93

I. Air supply system 93

Second, the fuel supply system 94

Three. Electronic control system 95

Section 2 Classification of Engine Fuel Injection System 96

A, according to the control mode of fuel injection system classification 96

Second, according to the injector injection position classification 97

Iii. Classification by injector injection mode 102

Four, according to the intake metering classification 104.

In the third quarter, the structure principle of fuel injection system actuator 105

I. Electric Fuel Pump 105

Second, the structural characteristics of electric fuel pump 106

Three. Fuel distribution pipe and oil pressure regulator 107

IV. Electromagnetic Ejector 109

Section 4 Maintenance of Fuel Supply System of Electronically Controlled Fuel Injection Engine 1 10

I. Test conditions of oil supply system 1 10

II. Detection of oil supply pressure and sealing capacity of oil supply system 1 10

Three. Fuel injection quantity and spray shape detection of fuel injector 1 12

Section 5 Maintenance of Actuator of Electronic Fuel Injection System 1 13

I. Maintenance of Electric Fuel Pump 1 13

Second, the oil pressure regulator maintenance 1 15

Three. Maintenance of electromagnetic injector 1 15

Section 6 Typical Fault Case Analysis 1 16

Case 1, Toyota Camry 2.4 Cold Car Starting Difficulty 1 16

Case 2: It is difficult to start the cold engine of Bluebird 1 17.

Case 3: Magotan 1.8TSI engine has poor acceleration and high fuel consumption 1 17.

Case 4, Chrysler Grand Cherokee Hot Car is difficult to start 1 18.

Case 5: Subaru Legacy produced in 2006 cannot be started 1 19.

Case 6: Chevrolet Cruze sometimes turns off the engine while driving, and sometimes it cannot be started 120.

Case 7: Honda Accord produced in 2009 can't start 12 1.

Chapter IV Maintenance of Electronically Controlled Gasoline Injection System 123

The first section gasoline pump control principle and maintenance 123

First, the engine ECU directly controls the working voltage of gasoline pump 123.

Second, the detection of electric gasoline pump relay 124

Control of fuel injectors in the second quarter 125

Section III Injection Timing Control 126

I. Simultaneous Injection Control 127

Second, the control group 127

Three. Sequential injection control 128

The fourth quarter control fuel injection 129

First, the control of fuel injection when the engine starts 129

Second, the control of fuel injection after the engine starts 130

Section 5 Control of Injection Advance Angle and Injection Duration 135

I. Control process of injection advance angle 135

Second, the control process of fuel injection duration 136

Section 6 Three-way catalytic conversion and feedback control of engine air-fuel ratio 136

I. Structure and Principle of Three-way Catalytic Converter 136

Second, the composition of the air-fuel ratio feedback control system 137

Iii. Air-fuel ratio feedback control process 138

Four. Air-fuel ratio feedback control condition 138

V maintenance of three-way catalytic conversion system 139

Section 7 Engine Fuel Cut-off Control 140

I. Overspeed fuel cut-off control 140

Second, deceleration and oil cut-off control 14 1

Third, clear the overflow control 142

Section 8 Typical Fault Case Analysis 142

Case 1: Jetta Idle Engine Jitter 142

Case 2: The engine fault light of LaVida is on 143.

Case 3: Nissan Tiida cannot accelerate 145.

Case 4: sagitar fuel pump fuse is frequently blown 145.

Case 5: The fault light of the new departure engine is on 146.

Chapter V Overview of Principle of In-cylinder Injection Engine 147

Section 1 Lean Combustion Technology of Engine 147

I. Characteristics and types of lean combustion 147

II. In-cylinder Direct Injection Technology 149

Iii. lean burn air-fuel ratio control 150

Principle and control of two-stage in-cylinder injection engine 152

I stratified combustion and direct injection in cylinder 152

Second, the advantages and disadvantages of GDI engine 153

Third, the working principle of GDI engine 154

Section III Main Components of Direct Injection Engine 157

I. GDI Engine Fuel System 157

Second, the GDI engine exhaust system 162

Section 4 Typical Fault Case Analysis 165

Case 1: Why does Magotan Instrument EPC light up 165?

Case 2: poor fuel supply and jitter of Mitsubishi Pajero GDI engine 168.

Chapter VI Ignition Control Principle and Maintenance of Gasoline Engine 17 1

Section 1 Composition of Electronic Ignition System 17 1

I. Sensor and switch signals 17 1

Second, the electronic control unit 172

Three. Ignition controller 172

In the second quarter, the control process of electronic control ignition system 173

A, electronic control ignition principle 173

Two. Determination of ignition advance angle of electronically controlled ignition system 174

Three. Control Process of Electronic Ignition System 175

Section 3 Distribution Mode of Electronic Ignition System 177

I. Mechanical Power Distribution Mode 177

Second, the electronic distribution mode 177

Iii. Distribution example of ignition coil 180

Four. Single ignition mode 183

Section IV Engine Knock Control Process 185

I. Composition of Engine Knock Control System 185

II. Identification and Control Process of Engine Knock 186

Section 5 Maintenance of Control Components of Electronically Controlled Ignition System 187

A, the correct use of knock sensor 187

Second, the knock sensor maintenance 188

Iii. Maintenance of Ignition Actuator 190

Section 6 Typical Fault Case Analysis 193

Case 1: POLO engine failed to start 193.

Case 2: The power of Mitsubishi Pajero fast running engine is less than 194.

Case 3: Shanghai Volkswagen Touran engine failed to start 196.

Case 4: Chery can't start after sudden flameout during driving 198.

Chapter 7 199 Principle and Maintenance of Idle Control System of Gasoline Engine

Section 1 Structure and Principle of Actuator of Idle Speed Control System 199

I. Idle speed control principle 199

Second, the idle speed control actuator 200

Section 2 Principle and Maintenance of Bypass Idle Speed Control System 200

1. Permanent magnet rotor stepper motor idle speed control valve 200

2. Idle speed control valve 205 of permanent magnet stepper motor

3. Rotary solenoid idle control valve 206

4. Pulse solenoid idle control valve 208

Verb (abbreviation of verb) duty ratio control vacuum on-off valve 2 10

Six, switch control vacuum switch valve 2 10

In the third quarter, structural overhaul of throttle direct-acting idle speed control system 10

1. Structural characteristics of throttle control element J338 2 10.

Second, the throttle control assembly J338 overhaul 2 12

Section IV Idle Speed Control Process 2 13

I. Composition of Idle Speed Control System 2 13

Second, the idle speed control process 2 14

Three. Control characteristics of idle speed control system 2 15

Section 5 Electronic Throttle System 2 17

I. Overview of Electronic Throttle System 2 17

Two. Control Principle and Component Structure of Electronic Throttle System 2 18

Three, the characteristics of the electronic throttle system 220

Section 6 Typical Fault Case Analysis 22 1

Case 1: Golf EPC Lighting Alarm 22 1

Case 2, BMW 3 18i engine sometimes "runs" 222

Case 3: Chery A 1 EPC lights light up from time to time.

Case 4: Santana 3000EPC light has been on for 224 hours.

Chapter VIII Emission Control and Intake Control of Gasoline Engine 227

Section 1 Emission and Purification of Gasoline Engine 227

In the second quarter exhaust gas recirculation control 229

I. Function and structure of exhaust gas recirculation system (EGR) 229

Second, the working process of EGR control 229

Three. EGR system detection 23 1

Section 3 Crankcase Forced Ventilation Control System 232

I. Structural composition 233

Second, the working principle of 233

Three. Maintenance 234

The fourth quarter activated carbon tank fuel evaporation pollution control system 234

I. Structure and working principle 234

Second, the detection of fuel evaporation control system 235

Section 5 Intake Control of Gasoline Engine 236

I. power valve control device 236

Two. Intake inertia supercharging control system 237

Three, exhaust gas turbocharging control 239

Fourth, the secondary air supply system 239

Section 6 Variable Air Intake Control System 240

I. variable valve timing control system 240

Second, the variable valve timing and valve lift electronic control system 246

Section 7 Typical Fault Case Analysis 249

Case one. Audi A6 produced in 2002 can't accelerate 249.

Case 2, Chevrolet fault light, power supply

Sexual degeneration 250

Case 3: Chevrolet Lefeng has a strong smell of gasoline when driving, and its fuel consumption increases by 25 1.

Case 4: The failure light of Chevrolet New Scenery Engine is on 25 1.

Case 5, Mercedes S300 engine fault indicator alarm 252

Case 6, BMW 750Li engine temperature is too high 253

Chapter 9 Electronic Control Engine Fault Self-diagnosis System 257

The first section vehicle electronic fault self-diagnosis principle and fault operation 257

A, the composition of the fault self-diagnosis system 257

Second, the function of fault self-diagnosis system 258

Section 2 OBD system 260

In the third quarter, the monitoring and diagnosis principle of electronic control system fault 26 1

I. Self-diagnosis of the monitoring point at the anode of the monitored component 262

Second, the monitoring point is located at the negative electrode of the self-diagnosis 263 of the monitored component.

The fourth quarter fault self-diagnosis content and test method 264

A, the types of automotive electronic fault self-diagnosis mode 265

Second, the self-diagnosis test content 265

The fifth section engine electronic control system fault self-diagnosis test 266

First, use jumper 266 for self-diagnosis test.

2. Use the code modulator 272 for self-diagnosis test.

3. Self-diagnosis test with decoder 272

Section 6 Fault Diagnosis and Troubleshooting Methods of Engine Electronic Control System 275

A, engine electronic control system fault diagnosis and maintenance procedures 275

Second, the engine electronic control system fault diagnosis and maintenance methods 275

Three, the engine electronic control system fault symptom table 276

Section 7 Typical Fault Case Analysis 277

Case 1, Mercedes-Benz E200 engine fault light turns on and off sometimes.

Case 2: After Passat Yu Ling 1.8T is started, OBD gives an alarm, and the cold car is difficult to start.

Reference 280