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IGN ignition angle measurement module 327

1st - 4th cylinder monitoring

With Monitoring of Selected Cylinders activated, the cylinders are selected by means of these

parameters. Depending on the amount of cylinders to be monitored, the corresponding amount of

boxes are to be configured. For each of the cylinders to be monitored, its position in the ignition order

is specified. The particular cylinder is assigned to the 1st ignition pulse in the duty cycle, or the 2nd,

etc.

Please observe the ignition order. For instance, if the ignition order is 1-4-2-3, then the 2nd ignition is

in the 4th cylinder. Thus, if the 4th cylinder is to be monitored, the "2nd ignition impulse in the duty

cycle" must be selected.

It is assumed that the ignition impulses are distributed evenly through the duty cycle and that the

amount of ignition impulses per duty cycle is correctly configured in the associated parameter (see

above).

Example: Assume we have a 4-cylinder 4-stroke engine with a 720° duty cycle. Every 180°, there is a

firing (ignition). If the firing occurs at 30° before TDC, then the positions of the firings within the duty

cycle are at -30°, (180-30)°, (360-30)° and (540-30)°. The individual cylinders' TDC angles within the

duty cycle are 0°, 180°, 360° and 540°. The cylinder whose TDC is at 0° is considered the first in the

duty cycle.

6.11.4.1 The channel's parameters

If on the left side of the imc CANSAS user interface's tree diagram, one of the input channels (ignition

signal, crankshaft, reference) in a imc CANSAS-IGN module is selected, then on the right side a table for

setting the input channel parameters appears. Multi-selection of the channels is possible.

Threshold:

A signal edge is detected when a certain signal level is crossed. This threshold value/level is stated in

Volts. It can lie between -40 V and +40 V. A resolution of 0.1V should also not be exceeded. This

means that sensible thresholds would include, for instance: 0 V, 0.1 V, 0.2 V, ...

IMC CANSAS User Manual

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