This example shows how to introduce, detect, mature, and report misfire events from the SI Core Engine. The model demonstrates misfire on-board diagnostics (OBD) warnings.
On the Simulation tab, click Run. As the simulation runs, diagnostic trouble codes appear on the MIL Light display. P0300 is a general warning for a misfire issue in one or more cylinders. P0303 indicates a specific misfire issue with Cylinder 3.
This subsystem detects misfire events, using crankshaft acceleration as an indicator. Navigate to
ECU With TPU and Diagnostics >
TPU Level Misfire Detection. Open the Diagnosis Parameters block. You can modify the OBD threshold calibrations for detection and maturation.
This subsystem defines misfire events to inject into the simulation. Navigate to
OBD Breakout Box >
Injector Pulsewidth Fault Injection. Open the Misfire Events block. You can modify the misfire fault injection timing.
The SI Core Engine computes cylinder pressure as a function of crank angle. The Crank VRS Sensor and Measurement Circuit simulates the 58-tooth wheel that tracks the progression of the 4-stroke engine cycle.
Open the Cranktrain block to modify the engine cranktrain geometry and dynamics.