IMC CANSAS - Page 321

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IGN ignition angle measurement module 321

Snapshot-mode:

"On": The Snapshot mode can be tuned on/off.

"Off": No Snapshot mode. Default operation instead (angle and RPM are determined)

Note: These input channel parameters are also observed in Snapshot mode. For this reason, these

parameters must also be well defined:

switchable pull-up resistor to 5V

coupling ( AC /DC)

low-pass filter

absolute value formation

Please also be sure to adjust the CAN-ID correctly.

Snapshot length

Length of Snapshot in samples. Lengths from 1000 to 30000 samples are available. Note that a small

buffer leads to fast buffer update rates. E.g. with a Snapshot output rate of 1ms, the complete

transfer takes between 1s and 30s.

This parameter can only be edited in Snapshot mode.

Snapshot output rate

After this period, the next CAN message, containing the measurement values of the Snapshots for the

next sample is sent. This is the clock rate at which the messages are sent. Periods between 1ms and

10ms are possible. The shortest possible time is recommended in order to transfer the contents of the

internal Snapshot buffer as quickly as possible. Naturally, the CAN-Bus' Baud rate must be adequately

high.

This parameter can only be edited in Snapshot mode.

Snapshot sampling rate

This is the sampling rate at which measured values are transferred into the internal buffer. Sampling

rates of 20 kHz up to 3 MHz are possible. Please note that at the highest sampling rates only a very

brief signal segment can be captured due to the internal buffer's length limitations. Please refer to the

chapter "Snapshot operation mode" for more details.

This parameter can only be edited in Snapshot mode.

Averaging time / output rate

The currently calculated instantaneous values for the ignition angle and the RPM are averaged

(arithmetically) over the duration set. Averaging periods of 5ms to 1s are possible. Once the averaging

is completes a CAN-message is outputted in which the averaged values are stated. If the display is

updated again, the last mean values determined are displayed. As the duration for the averaging

increases, the result values become more stable, but the output appears more stagnant. On the

analog outputs, as well, the mean values are outputted immediately upon being calculated.

If monitoring of selected cylinders is used, the CAN-messages assigned to the cylinders are outputted

at the same clock rate.

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