Elctric Acuator: Engine Control Unit Tuning With the Unichip Q

The current Multiport Fuel Injection System is made up of electrical sensors which detect the particular engine conditions, the Powertrain Control Module (PCM) which controls the fuel injection system based on return signals from these electrical feedback sensors, as well as electrical actuators which operate under the control of the actual Powertrain Control Module (PCM).

The ECU (aka the Blackbox) carries out activities such as fuel injection control, idle air control, and spark ignition control.

In addition, the PCM is equipped with a number of diagnostic test settings which simplify trouble shooting when a new OBD2 trouble code develops.

The two most common calibration which a person require to manipulate or adjust is without question the timing as well as feul

Ignition timing control
The ignition igniter module located in the ignition primary circuit pulse ON and OFF to control the actual main current flow to the particular high voltage igntion coil. This method controls the ignition timing to supply the optimal ignition timing with regard to the engine performing conditions. The actual spark ignition is decided on by the ECU (Engine Computer) through engine speed, air intake, engine temperature (ECT), coupled with atmospheric pressure.

fuel injection management
The injector on milliseconds (MS) along with injector timing are controlled so that the the best air/fuel mixture is provided to the engine to correspond to the continually-changing engine operating conditions. A correctly sized fuel injector is positioned at the intake port of each cylinder. Gasoline is delivered using pressure from the gas tank towards the fuel injectors through the fuel pump, with the actual pressure being regulated by means of the fuel pressure regulater at around 55 psi. The controlled fuel is then distributed evenly to each one of the injectors. Sequential fuel injection is normally completed once for each cylinder for every 2 revolutions of the crankshaft. On a four cylindr motor the actual firing order is 1-3-4-2. Each cylinder will have a dedicated gasoline injector. This is known as multiport injection. The ECU provides a richer air/fuel mixture by carrying out “open-loop” control when the engine is cold or operating under high load conditions in order to maintain engine performance.In addition, when the engine is under normal operating temperature after warming-up, the ECM (aka The Blackbox) manages the air/fuel mixture using the heated oxygen sensor signal to execute “closed-loop” management. The closed-loop control defines the Stoichiometric Air-fuel mixture ratio where the catalytic converter can obtain the highest cleaning efficiency.

With the Unichip (Q version) you have complete control over all these parameters in order to make changes to the timing and fuel tables. The Unichip (Q version) has 24 RPM sites between 100 RPM and 24000 RPM and 13 load sites between closed throttle full throttle position. This equates to 312 practical adjustments for each map. In turn the Unichip Computer is going to interpolate in between each speed and load site sixteen times which gives a decent resolution densed map.

UniQ is Unichips most recently released computer software for tuning engine ECU’s. This software program is a revolutionary change from old style DOS software program that had been in operation for more than ten years. Take the Unichip (new version) Tuning software for a test drive and see for youself.

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