Getting to Know DWB Technology (Drive-By-Wire) on a Car Engine – DBW or ETC, drive by wire (DBW) or
also called Electronic Throtle Control (ETC) which is commonly called
Throtle Actuator Control.
The engine generated RPM is affected by the amount of air and fuel that enters
into the cylinder block. To regulate
the amount of air that enters the tool needed
named throtle. This tool will work to open and close the flow of air to
engine intake. Opening angle
throtle set by the driver via the gas pedal. In general, the wire cable on the accelerator is used as a link between the throttle and the accelerator. However, nowadays technology has developed rapidly. So that the wire is no longer used
as a link between the throttle and the accelerator. To connect the two, the use of wire is replaced by cable.
"What Is Throttle-By-Wire?"
Throtle-by-wire is also known as Throtle actuator control (TAC) and
Electronic throtle control (ETC). TAC utilizes electric current to
sending a signal
from the accelerator to the throtle body. An electronic circuit is used for
set the slowdown,
idle RPM generated from the engine. The existence of TAC
also removes the Idle speed Control (ISC) component because the idle function will
directly determined by the angle of the throtle. Initially the use of this technology has been applied by BMW
The advantage gained using this technology is the level of usage
more economical fuel. Because this system will supply air with
very accurate through several sensors that are placed in various places. Besides
that, the acceleration
feels smoother even when
stepped on the gas pedal quickly. But care should also be taken of
this system. Machines that carry DBW technology are more sensitive, make sure to always do service
Components-Components of TAC (Throtle
One unit of TAC system, there are several
components that work together to produce accurate RPM control. Component
it has various parts, consisting
from the control component, actuator component and input component.
1. APP Sensor
APP Sensor functions as
sensor that detects the gas pedal on it stepped on by the driver. APP
The sensor utilizes a variable resistor such as the Throtle position sensor. Sensor
This unit is located with a gas pedal. Usually in one pedal unit
There are two to three APP sensors that are used. It is intended that the pedal reading when stepped on is more accurate.
2. PCM or ECM
Engine Control Module (ECM) or Powertrain Control Module (PCM) functions as a data processor
come from several sensors. This module contains several IC series which are programmed to control deceleration, acceleration and other conditions related to engine RPM.
3. Throtle Body
Throtle Body is the main component used as an actuator to regulate the amount of air entering the intake.
In one unit throtle body usually has several components such as
modulator, motor throtle and TPS sensor.
This component is located together in the throtle body component. So when
one component is damaged, must replace one Throtle Body unit.
Throtle Position Sensor is used to detect the opening angle of the throtle. This information is used as feedback from the TAC process.
Throtle Modulator functions to translate the signal from the ECM electric current magnitude used to operate the motor Throtle.
Throtle Motor. This component is in the form of a DC motor that will move to move the gas valve. This motor will open and close the gas valve.
How TAC (Throtle) System Works
For the workings of this system, you could say it's quite simple. How it works
utilizing the flow of electric current as an introduction to data from sensors to components
control. After that, the control component will provide an output signal in the form of a voltage to the actuator for
setting open and close the gas valve.
1. Condition When Ignition is "ON"
When the ignition is in the "ON" position, the main relay will be connected
and activate the control module. ECM will send a reference voltage to
several sensors, one of which is a sensor
APP. Reference voltage
which is produced from each car is different. But in general this voltage
by 5 Volts. APP sensor will
sends a signal in the form of reverse voltage
around 0.1 Volts to 4.9 Volts. When the gas pedal is in no condition
stepped on, the APP will send a voltage signal
reverse of 0.1 Volt.
2. Conditions When the Engine "Start"
At the start condition,
ECM will give a command to the Throtle Body to open. Although the accelerator
in conditions not trampled, ECM still gives orders to the body to protect
open at the start. The goal is that the start process takes place lightly.
The result at the beginning of the start, the engine RPM will go up and in an instant down
to normal RPM.
3. Conditions During Acceleration
When you step on the gas pedal,
APP sensor will send a voltage signal
turning is greater than 0.1 Volt accordingly
with pedal depth.
The reverse voltage is used by ECM to analyze the amount of RPM
the driver wants. This data is processed together with some data from
other sensors to produce the appropriate RPM. ECM will send the results
analysis in the form of the amount of voltage to the Throtle body. The motor throtle will open
as instructed by ECM. So
4. Conditions During Deceleration
At the time of deceleration, the APP Sensor will send more back voltage
small according to the position of the gas pedal. And there was a process like acceleration. When
TAC acceleration and deceleration cannot be done constantly. Although the pedal
gas stepped on suddenly, the acceleration produced was still smooth.
TPS is an important component. This component will correct
opening angle of the throtle by sending the return voltage to the ECM. So that on
when the data provided is not appropriate, ECM will
cut-off and turn off the engine. So the safety aspect will be
fulfilled while driving.
(tagsToTranslate) Knowing DWB (Drive-By-Wire) Technology in Car Engines