Ignition Trigger

Trigger system for spark-ignited combustion engine

Since R2022a

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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.

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.

SA — Spark angle input, deg

physical signal

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

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.

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.

Version History

Introduced in R2022a