Haltech E6S Manual do Utilizador descarregar pdf (Página 113)

113

Figure E.2

In the previous examples the trigger edge has been shown as the first edge of the trigger pulse.

The trigger does not necessarily have to be the first edge of the trigger pulse. Consider the

example shown in figure E.3. In some trigger devices the pulse given for cylinder one would

be a different width than the pulses given for all the other cylinders. If the first, in this case,

rising edges were used as the trigger edge then there would be a variation of 20° between the

trigger for cylinder one and all other cylinders. This would lead to cylinder one being 20°

more advanced than all the other cylinders and obviously this would be unacceptable. The

answer in this case would be to set the trigger point so that it is at a falling edge and to have

the trigger degrees set to 60° BTDC.

Figure E.3

E.2 Trigger Devices

The output of Hall Effect or Optical sensors could normally be connected directly to the input

trigger pin of the E6S ECU. Many distributors uses in original equipment manufacturer’s

computer controlled ignition systems would be fitted with Hall / Optical triggers. The internal

structure of such distributors is usually configured so that a chopper wheel attached to the

distributor shaft passes through a gap in the sensor. These devices require three connections :

Power (normally +12V)

Ground, and

Trigger signal output.

Assuming that the timing edges conform to the details set out above, a distributor such as this

would connect directly into the E6S ECU. Often these distributors have a rising edge trigger at

70° BTDC.

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Haltech E6S Manual do Utilizador Página 113