VISTA Knock PIPI Window Set

This MotoHawk™ block controls the PIPI signal of the named VISTA knock device.

Block ID

VISTA Knock PIPI Window Set

Library

MotoHawk_lib/Knock Blocks

Description

Overview

The PIPI signal is synonymous with the ProSAK cylinder increment signal and should be used in the same fashion. VISTA will generate as many pulses as there are TDC Angles and will distribute the pulses about the cycle based upon these values.

Timings have a fixed point scaling where a value of 1 represents 0.0625 degrees crank angle before firing TDC (x16degBfTDC). Negative timings represent an after TDC timing.

The VISTA's internal cylinder count will increment on the rising edge (== start timing) of the PIPI signal.

Knock sensor selection is also updated on the rising edge (== start timing) of the PIPI signal when the Sensor Update Mode has a value of 1.

Timing Update Considerations

The timing values controlled by this block utilize the existing Encoder TDC Offset (see the Encoder Definition block) to correctly locate the pulse in the crank angle domain. The compensation for any Encoder TDC Offset is only applied by this knock timing block when it executes. Therefore, to use the Encoder TDC Offset block, for example, to change the offset value at runtime, the model would need to place any knock timing blocks in the model so that they would execute subsequently to any TDC offset change.

Thus, if the Encoder TDC Offset block executes at start-up then this timing block must, at a minimum, execute at start-up after the Encoder TDC Offset block has executed. If the Encoder TDC Offset block is executed periodically (for example, at every RTI), then this timing block must likewise execute periodically afterwards, because otherwise the offset could change after the knock timing block executes.

In summary, because the signal controlled by this block takes the Encoder TDC Offset value into account, this block should execute periodically or after the Encoder TDC Offset has been applied.

Block Parameters

Parameter Field	Values	Comments/Description
Name	Alpha-numeric text, single-quote enclosed	Name of the VISTA knock device to be affected.