Knowledge share by
Mashiur Rahman with Modern Vehicle.
ECCS OUTLINE
1) What’s ECCS?
2) Purpose of ECCS Development
3) ECCS Flow System
ECCS SYSTEM CONFIGURATION
1) Fuel
Injection Control
2) Ignition Timing Control
3) Fuel
Pump Control
4) Idle
Speed Control
5) Pressure Regulator Control
6) Fail-Safe System
7) On
Board Diagnosis System
THREE MAJOR FLOW SYSTEMS
1. Fuel
Flow System
2. Air
Flow System
3. Electrical Flow System
FUNCTION OF COMPONENT PARTS
1. Component Parts Location
2. Sensors
3. Actuators
4. ECCS
Control Module (ECM)
5. ENGINE SPEED CONTROL
1. At Cold Condition
2. Idling After Cold Start
3. Idling After Engine Warm-up
4. Control During Acceleration
5. Knocking Control
6. Control During Deceleration
ECCS OUTLINE
1) What’s ECCS?
ECCS is
the original abbreviation for Electronic Concentrated Engine Control System and
used to be the symbol of the improved system of the electronically controlled
engine management system of its first-generation (EGI or EFI). ECCS accurately controls fuel injection quantity, idle
engine speed, and ignition timing for every engine condition. To
perform such accurate controls, ECCS requires various information to come from
the sensors as input signals. Then the
system determines the appropriate value among the programmed data and sends output signals to
the respective actuators.
2) Purpose of ECCS Development
•
Improve engine performance
•
Improve fuel consumption
• Reduce air pollution
•
Improve drivability
•
Improve stability in cold condition
3) ECCS Flow System
Although
particular components vary from model to model, basically, the ECCS monitors
and controls these 3 primary systems to
maintain the maximum engine performance.
• Fuel
flow system
• Air
flow system
•
Electronic flow (ignition) system
Constant
adjustments are made to maintain a specified relationship between these
systems. Understanding this relationship will allow you to more easily break
down the overall engine operations into smaller segments. In doing so, you can
more systematically target and/or eliminate them as part of the cause of any
malfunctions. Brief descriptions of each system are found on the following
pages. To maintain the operational relationship described above, the ECCS uses
three basic types of components such as sensors, controllers and actuators.
2. ECCS SYSTEM CONFIGURATION
ECCS is capable of controlling a
number of functions. It is also capable of providing more delicate and more
sophisticated control for the various engine operating conditions. The following functions are controlled by
ECCS.
1) Fuel Injection Control
Based on the quantity of intake
air (air mass), the fuel injection control system determines the fuel injection
quantity corresponding to the engine conditions. For example, the optimum fuel
injection quantity is determined by the coolant temperature at the time when
the engine is operating. After idling, the air-fuel mixture ratio is properly
controlled by a learning function.
2) Ignition Timing Control
Reads data from the program
matrix stored in ECM and determines the optimum ignition timing based on the
engine speed and the intake air quantity.
3) Fuel Pump Control
Controls the power supply to the
fuel pump according to the engine conditions. It includes a system that
controls the power supply voltage value in order to reduce the pump noise and
the power consumption.
4) Idle Speed Control
Receives signals from various
sensors and adjusts the engine to the optimum idle speed
5) Pressure Regulator Control
Increases
the fuel pressure temporarily when starting an engine that has a high coolant
temperature. The fuel pressure is normally controlled corresponding to the
intake manifold vacuum pressure by means of the fuel pressure regulator.
6) Fail-Safe System
The ECM
has a backup program for when a malfunction occurs in some important
sensors and the ECM is able to control
the engine in a limited manner so the vehicle may be driven.
7) On Board Diagnosis System
The ECM
is able to monitor major sensors and some actuators for incorrect signals. If a
malfunction occurs due to missing, open or short circuits, the ECM self-diagnosis system will record a code that
can be retrieved by a service technician
during diagnosis.
3. THREE MAJOR FLOW SYSTEMS
1) Fuel Flow System
All ECCS
models have the same basic fuel flow system, as shown in the diagram below. A
fuel pump pulls the fuel from the fuel tank, moves it through the fuel lines
(including a fuel filter) and eventually supplies it to the engine through the
fuel injectors. The pressure control device maintains the specified fuel
pressure throughout the system.
2) Air Flow System
As with
the fuel flow system, ECCS air flow systems are basically the same from model
to model. Since the quantity of air mixed with fuel (mixture ratio) is the key
to engine performance, the control of intake air is extremely important.
Sensors Location
Sensors Name
What is the ECU in a car?.
An engine control unit (ECU) is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance.
Mashiur: ECU is an electronic device, which is received a signal from various types of sensors. After received that signal, calculated the data to drive actuators.
what is sensor ?.
A sensor is a device that detects and responds to some type of input from the physical environment. The specific input could be light, heat, motion, moisture, pressure, or anyone of a great number of other environmental phenomena.
Actuator
An actuator is a component of a machine that is responsible for moving or controlling a mechanism or system. An actuator requires a control signal and a source of energy. The control signal is relatively low energy and maybe electric voltage or current, pneumatic or hydraulic pressure, or even human power.
