Small Engine Control

The circuit design is a one-cylinder engine controller based on the Freescale MM912JS812, which contains a MC9S12XS128 microcontroller, and an MC33812. The unit will run from a 12 V battery and control engine loads such as a fuel injector, inductive ignition coil, relays, incandescent lamps, and LEDs. It can also take inputs from switches and sensors, such as Engine Stop switch, manifold air pressure, engine temperature, and variable reluctance sensors.

This design is applicable to household equipment such as lawn mowers. It is also useful to fueled ATVs and go-karts for personal use while scooters and small machineries are for commercial purposes.