Ignition Trigger

R2026b

Trigger system for spark-ignited combustion engine

Since R2022a

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Ignition Trigger block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simscape / Driveline / Engines & Motors / Engine Subcomponents

Description

The Ignition Trigger block represents an abstract ignition trigger system for internal combustion engine models. This block takes the spark angle as input at port SA and generates an asynchronous event trigger output at port Trig when the crank position crosses the spark angle. The block ignores the dynamics of the ignition system.

Connect a Crankshaft block to the Cam port.

Examples

Single Cylinder Spark Ignition Engine

A crank-angle-resolved, naturally aspirated spark ignition engine. Control inputs such as throttle, intake VVT, air-to-fuel ratio, and spark advance vary during the simulation. You can simulate results from either an Otto cycle engine or an Atkinson cycle engine.

• Open Model

Ports

Inputs

Cam — Crank position, deg

physical signal

Physical signal input associated with the crank position in 720 degree cycles.

Programmatic Use

Port: crkpos

Sw — Ignitor switch input signal, binary

physical signal

Physical signal input associated with the ignitor switch input signal, where 0 turns off the ignitor and 1 turns on the ignitor.

Programmatic Use

Port: enabled

SA — Spark angle input, deg

physical signal

Physical signal input associated with the spark angle before top dead center, in degrees.

Programmatic Use

Port: SA_degBTDC

Outputs

Trig — Asynchronous trigger report, binary

physical signal

Physical signal output associated with the asynchronous spark trigger events that the block generates, where 0 turns off the trigger and 1 turns on the trigger.

Programmatic Use

Port: y

Assumptions and Limitations

The block does not include the dynamics of the ignition system.

Parameters

Number of cylinders — Total cylinder count

Single Cylinder (default) | Two Cylinders | Three Cylinders | Four Cylinders

Number of spark ignition cylinders.

Programmatic Use

Parameter:	numCyls
Values:	"sdl.enum.engineNumCylinders.One" | "sdl.enum.engineNumCylinders.Two" | "sdl.enum.engineNumCylinders.Three" | "sdl.enum.engineNumCylinders.Four"

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"sdl_lib/Engines & Motors/Engine Subcomponents/Ignition Trigger"

Example: add_block("sdl_lib/Engines & Motors/Engine Subcomponents/Ignition Trigger","myModel/myBlock",MakeNameUnique="on")

For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.

Version History

Introduced in R2022a