Single Cylinder ECU Reference Design

Discover the important thing options, together with extensive voltage operation, sturdy safety mechanisms, and direct MCU interfacing, that make this reference design a complete answer for single-cylinder engine management.

The Small Engine Reference Design is a compact {hardware} answer that controls single-cylinder engines. It’s based mostly on a mix of the corporate’s semiconductor elements, together with the MC9S12P128 microcontroller, the MC33812 Small Engine Built-in Circuit, and the MC33880 Configurable Octal Serial Swap. A 12 V battery powers this unit and might management numerous engine hundreds equivalent to gasoline injectors, inductive ignition coils, relays, incandescent lamps, and LEDs.

Relating to inputs, the Engine Management Unit (ECU) accepts indicators from switches and sensors, together with an Engine Cease change, manifold air stress sensor, engine temperature sensor, and variable reluctance sensors. The applying software program that runs on this unit incorporates the engine management technique, which is essential for the engine’s correct functioning. Though this reference design just isn’t supposed for manufacturing functions particular to any engine, it goals to supply a appear and feel just like that of a manufacturing module. Its compact dimension, resembling that of a enterprise card, and its minimal provision for enlargement are notable options.

This reference design, KIT33812ECUEVME by NXP, is a totally purposeful single-cylinder engine management unit outfitted with numerous key options to make sure dependable and environment friendly operation. It helps the corporate’s 33812 and 9S12P128 MCU units and might be configured for dual-cylinder engines, though it requires the applying to tolerate simultaneous sparks in each cylinders. The unit operates over a large voltage vary of roughly 4.7 V to 36 V. It features a gasoline injector driver with a typical present restrict of 4.0 A, an ignition pre-driver that may drive IGBT or Darlington bipolar junction transistors, and relay and lamp drivers with present limits of 4.0 A and 1.5 A, respectively. 

The exterior outputs are protected towards short-circuiting to the battery and over-current to make sure security and sturdiness. In distinction, the ignition and different drivers are protected towards over-temperature circumstances. The unit instantly interfaces with the MCU utilizing a 5.0 V parallel interface and incorporates a VCC voltage pre-regulator that gives +5.0 V energy for the MCU. Extra functionalities embody an MCU Energy On RESET generator, an MCU watchdog timer circuit, and unbiased fault annunciation outputs for ignition and injection. For debugging functions and speaking diagnostic messages, the design incorporates an ISO-9141 Ok-Line transceiver. Total, this reference design presents a complete answer for controlling single-cylinder engines, with a variety of options and protections to make sure environment friendly and dependable operation.

NXP has examined this reference design, which comes with a invoice of supplies (BOM), schematics, and different information. The corporate’s web site has further information in regards to the reference design. To learn extra about this reference design, click on right here.