An
electronic system
is operated entirely by a microprocessor control unit. This
measures factors such as the engine temperature, the throttle
position and the engine speed to compute the fuel/air mixture
required by the engine and its timing to the injectors.
An
electronic system
is operated entirely by a microprocessor control unit. This
measures factors such as the engine temperature, the throttle
position and the engine speed to compute the fuel/air mixture
required by the engine and its timing to the injectors.
Bosch electronic fuel injection
The main difference between electronic injection and mechanical
injection is that an electronic system is controlled by a
complex microprocessor control unit (sometimes called an
electronic control unit or ECU), which is basically a miniature
computer.
This computer is fed with information from sensors mounted on
the engine. These measure factors such as the air pressure and
temperature in the air intake, the engine temperature,
accelerator position and engine speed. All this information
allows an electronic system to meter the fuel far more
accurately than the simple mechanical system, which relies on
sensing the airflow alone.
The computer compares the input signals from the sensors with
information already programmed into it at the factory, and works
out exactly how much fuel should be delivered to the engine. It
then signals the on-off valve ig the injector to open and squirt
fuel into the inlet port. All this happens in a fraction of a
second, the control unit responding instantly to changes in
accelerator position, temperature and air pressure.
As well as improved control over fuel flow, the electronic
system also operates at lower pressure than a mechanical system
– usually at around 25-30psi. This makes it run more quietly
than a mechanical system does.
A typical system is the Bosch L Jetronic, which is fitted to a
wide range of European cars. In this system, fuel is drawn from
the tank by an electric pump. It is then fed straight up pipes
to the injectors. The system pumps more fuel than is needed for
injection – a loop circuit returns the excess to the fuel tank
via a pressure regulator which keeps the pressure in the pipes
constant.
The injector valves are held closed by springs, and opened by
solenoids(electromagnets) when signalled to do so by the control
unit. The amount of fuel injected depends on how long the
solenoid holds the injector open.
Benefits of using fuel injector cleaners
Cleaner engine
Better performance
Improved fuel economy
Reduced emissions
Easier starting
Smoother running
Bad fuel injectors
Engine Misfires
Rough Idling
Fuel Consumption
Increases
RPM Needle is erratic
Car is difficult to start
The “Check Engine
Light” goes on
Fuel Leak
Car Stalls after pressing Accelerator
Frequently asked questions
If you think your fuel injectors are beyond repair.
We suggest you contact your nearest e-CAR
Workshop.
