HỆ THỐNG ESA (electronic spark advance)

Diagnosis Technician >> Gasoline Engine Control System >> ESA

Description

Ignition timing (advanced angle)

Description

High
Engine speed

Amount of intake air
(Manifold pressure)
High
ESA map

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Description

Construction

IDL
Air flow meter

Throttle position sensor

VG

ECU

PIM
KNK
G
IGT
IGF

Ignition coil
with igniter

THW
NE

Manifold
pressure
sensor
Camshaft
position
sensor

OX1A

Oxygen
sensor
No.1

Water
temperature sensor

Knock sensor

Crankshaft position sensor

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Description

Construction

IDL
Air flow meter

Throttle position sensor

VG
ECU

PIM
KNK
G
IGT
IGF

Ignition coil
with igniter

THW
NE

Manifold
pressure
sensor
Camshaft
position
sensor

OX1A

Oxygen
sensor
No.1

Water
temperature sensor

Knock sensor

Crankshaft position sensor

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Description

Construction

IDL
Air flow meter

Throttle position sensor

VG
ECU

PIM
KNK
G
IGT
IGF

Ignition coil
with igniter

THW
NE

Manifold
pressure
sensor
Camshaft
position
sensor

OX1A

Oxygen
sensor
No.1

Water
temperature sensor

Knock sensor

Crankshaft position sensor

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Description

Construction

IDL
Air flow meter

Throttle position sensor

VG
ECU

PIM

KNK
G
IGT
IGF

Ignition coil
with igniter

THW
NE

Manifold
pressure
sensor
Camshaft
position
sensor

OX1A

Oxygen
sensor
No.1

Water
temperature sensor

Knock sensor

Crankshaft position sensor

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Ignition Circuitry

Description

Ignition coil with igniter

ECU
Constant
voltage
circuit

+B

IGT
Drive
circuit

G
Microprocessor
NE

IGF signal
generation
circuit

IGF

Spark plug

ECU

Ignition coil with igniter

Ignition order

IGT1
IGT3
IGT4
IGT2
IGF

No.1 cylinder
No.3 cylinder
No.4 cylinder
No.2 cylinder

DIS (Direct Ignition System)

IGT1 ON
OFF
IGT3 ON
OFF
IGT4 ON
OFF

IGT2 ON
OFF
IGF ON
OFF
(1/1)
REFERENCE:
Distributor Type Ignition Circuitry


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Ignition Circuitry

IGT and IGF Signal

1.IGT signal/
2.IGF signal

TDC

TDC
TDC
Ignition

IGT
180° (4 cylinders)
120° (6 cylinders)

Ignition
TDC

IGT
Advance angle
Initial ignition timing 5°, 7° or 10° BTDC
(depending on engine model)
Ignition order
IGT1 ON
OFF
IGT3 ON
OFF
IGT4 ON
OFF
IGT2 ON
OFF
IGF ON
OFF

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA
1.Starting
ignition control/
2.After-start
ignition control

Outline of Ignition Timing Control

At starting

Initial ignition timing angle

Basic ignition advance angle
After starting
Corrective ignition advance angle

Actual ignition timing
Ignition
timing
control

Starting ignition control

Initial ignition timing angle

After-start ignition
control

Initial ignition timing angle
Basic ignition advance angle
Warm-up correction
Corrective
Over-temperature correction
ignition
Stable idling correction
advance
control
Knocking correction

Other correction
Maximum and minimum advance
angle control

(1/1)
REFERENCE:
Initial Ignition Timing Angle Judgment


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Starting Ignition Control and
After-start Ignition Control

Control of ESA
1.Starting ignition control/
2.After-start ignition control

Engine ECU
Microprocessor

Back-up IC
G
NE

IGT

Initial ignition timing angle
signal generation circuit

Back-up IC
G
NE

Microprocessor

Engine ECU

Various
signals
(VG, PIM etc.)
IGT

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA

Basic Ignition Advance Angle

1.Control when the IDL
signal is ON/
2.Control when the IDL
signal is OFF
Basic ignition
advance angle

A/C on (some models only)

Engine speed

High

Ignition timing
(advanced angle)

0 Low

High
Amount of intake air
(Manifold pressure)

Engine speed
High
ESA map
(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA

Advance angle

1

0
80*

(140)
Coolant temperature °C (°F)
*Depending on engine model.

2
Advance angle

1.Warm-up correction/
2.Over-temperature correction

Corrective Ignition Advance Control

0

-5
100*
(230)
Coolant temperature °C (°F)
*Depending on engine model.
(1/4)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA

Corrective Ignition Advance Control

3.Stable idle correction

Retard
angle

0

Advance
angle

3

Minus

0

Plus

Difference from target idle speed

(2/4)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA

Corrective Ignition Advance Control

4.Knocking correction

Advance angle

4

0

Weak

Engine knocking

Strong

Engine knocking
occurs

Timing retarded

Timing advanced

Engine knocking
stops

(3/4)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA

Corrective Ignition Advance Control

5.Other correction

(4/4)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Maximum and Minimum Advance Angle
Control

Control of ESA

Maximum advance angle

35° ∼ 45°

Minimum advance angle

-10° ∼ 0°

Advance angle

=

Basic ignition advance angle
+
Corrective ignition advance angle

(1/1)

Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA

Ignition Timing Inspection

Initial ignition timing angle

Fixed ignition advance angle
Standard ignition
timing angle
E1

TE1

E1

TC
DLC1

TE1
DLC2

DLC3

CG

Engine
model

Initial
ignition timing

Fixed ignition
Standard
advance angle ignition timing

Type 1

10° BTDC

0° BTDC

10° BTDC

Type 2

5° BTDC

5° BTDC

10° BTDC

Type 3

7° BTDC

0° BTDC

7° BTDC

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Ignition Circuitry

Distributor Type Ignition Circuitry

Distributor
Igniter

Ignition
coil

No.1 cylinder

IGT
No.3 cylinder

ECU
IGF

No.4 cylinder

High-tension code

No.2 cylinder

(1/1)


Diagnosis Technician >> Gasoline Engine Control System >> ESA

Control of ESA

Initial Ignition Timing Angle Judgement

Timing rotor

Point A

Point B
Point A

G signal
G signal
timing rotor
and G pickup
coil

G
Point B
5°, 7° or 10°
BTDC

5°, 7° or 10°
BTDC

NE

NE signal
timing rotor
and NE pickup
coil

5°, 7° or 10°
BTDC
NE
TDC
signal

Ignition

Ignition

IGT
IGT with initial ignition timing
IGT with timing advanced

(1/1)