Pre-ignition options and revolution sensor

What pre-ignition value has to be set up pre-ignition sensor for?

• Pre-ignition control is based on exact ignition delay from primary signal of retation sensor. Delay period for pre-ignition control is in whole range converted from entered pre-ignition curve. By this principle is evident, that on sensor has to be set maximum value of pre-ignition, required by engine. Set pre-ignition value is then entered in Ignition Control application to Pre-ignition sensor item. Entered value impacts accuracy of Online visualisation and conversion of pre-ignition curve.

Is it somehow possible to convert pre-ignition from [mm] to [°] ?

• Value of pre-ignition sensor´s position is entered in [°], but there´s possible covertion from [mm] to [°] with help of Pre-ignition editor, which can be activated by double-click to pre-ignition sensor´s value. For convertion is necessary to enter length of pre-ignition [mm], engine stroke [mm] and length of piston rod [mm]. If you´re not able to measure length of piston rod, it´s possible to choose it´s length as from one and half to double of engine stroke.

How can be changed value of pre-ignition in comparison with original gavel ignition?

• Engine pre-ignition is for common motorcycle engines set on middle revolutions, where engine runs most often. When you use ignition with pre-ignition control, it´s necessary to extend pre-ignition for 1 or 2 mm in comparison with original value to create space for possible expansion of pre-ignition in high engine revolutions. For middle and free-running revolutions ignition lowers pre-ignition by entered pre-ignition curve.

Is it possible to use only one sensor for independent control of two coils?

• Yes, all types of ignition allows detection of rising and declining ignition signal edges. On their base ignition divides sparks to individual coils. But this principle is possible to use with Hall and Optical sensor only.

Is it possible to compensate pre-ignition in case of unsymmetric storage of twin-cylinder engine crank-shaft?

• Yes, correction of pre-ignition is allowed by function „Pre-ignition correction A“ or „Pre-ignition correction B“. Correction is possible in range of ±15,5°. But for correction to + is necessary reserve in actual value of pre-ignition and set value of pre-ignition sensor.

How are sensors supplied?

• Direct ignition and Universal ignition works with external rotation sensors only. Hall sensor and Optical sensor needs supply 5V, which can be taken directly from 5V output.

What serves correction of pre-ignition curve for?

• There´s showing mistake during impulsion from pre-ignition sensor processing and spark generating. Mistake is created by sum of sensor´s delay, input filter, digital processing and ingnition coil delay. Mistake is showed by gradual lowering of pre-ignition in rising revolutions. Pre-ignition control mistake is about from 2 to 4° according to type of sensor by revolutions over 10.000 rev./min.

What serves pre-ignition sensor´s filter for?

• Filter allows limitation of eventually undesirable disturbance, which could produce mistake of engine rotation metering and so even mistake in pre-ignition control. For most of cases fits filter value set to 5°.

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