This correction does not run when the engine exceeds a predetermined speed. In some engine models, the lead angle changes depending on whether the air conditioning is on. In other engine models, this fix only works when the engine speed is below the target speed. Correction for EGR EGR valve when it is operating, the ignition timing is advanced according to the air intake and consumed in the engine’s RPM to improve the handling. The EGR gas has the effect of reducing detonation and rattles in the engine, so the time can move forward. Knock Sensor Correction Detonations and jingles, when sufficiently severe, can cause serious mechanical damage.
The design of the combustion chamber, octane gasoline, stoichiometric ratio of the mixture and ignition timing in the aggregate are factors that affect when the explosions occur. Under most operating conditions the engine, the ignition timing needs to be near the point at which the rattling occurs to achieve better fuel economy, higher torque and lower engine emissions. However, the point where the rattling occurs will vary for a variety of factors, for example, if the octane of gasoline is very low and the ignition occurs at the optimum time, the jingle will occur. To prevent this, use a jingle or detonation correction. When the engine rattle occurs, the knock sensor converts the vibration rattling in voltage signals that are detected by the PCM.
According to its software, the PCM will retard the time in small steps until the rattle disappears. When the rattle stops, the PCM stops the ignition delay time and is proceeding in small steps. If the continuous progress of time and the jingle occurs, the ignition timing is delayed further. The PCM is able to determine which cylinder is rattling by the time the firing signal is received. The PCM knows which cylinder is on compression stroke on the basis of signals from the crankshaft position sensor and camshaft position. This allows the PCM filter any false signal. Some mechanical problems can duplicate the rattle of the engine. A metal rod or a cut excessively worn cylinder cause it to vibrate at the same frequency as the rattle of the engine.
Consequently, the PCM will retard the time. Correction stoichiometric engine is particularly sensitive to changes in the proportion of air / fuel ratio when operating at idle, so a stable idle is secured to advance the ignition timing at this point to tie the correction of fuel injection / consumption air. This correction does not run when the vehicle is driving cruise. Correction for Transition During the transition (change) deceleration to acceleration, the ignition timing is advanced or delayed temporarily under acceleration. Maximum and Minimum Control Power Forward Progress If time becomes abnormal ignition, the engine will be severely affected. To prevent this, the PCM controls the real progress that the sum of the basic ignition angle and firing angle, a correction that can not be higher or lower than the minimum or maximum values that were pre-programmed.