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Driver-Based Reference Design For Small Engine Electronic Fuel Injection

Discover how this design offers precise control for motorcycles, generators, and more, ensuring compliance with emission standards while maximising efficiency and reliability. 

One and two-cylinder internal combustion engines play a pivotal role in various applications, offering compact yet powerful solutions for various mechanical needs. These engines are commonly found in motorcycles, small generators, agricultural equipment, and marine propulsion systems, where their simplicity, reliability, and efficiency are highly valued. Despite their smaller size compared to multi-cylinder engines, they can deliver adequate power for their intended purposes while being easier to maintain and more cost-effective to manufacture. Their versatility makes them indispensable when space and weight constraints are paramount, making them a cornerstone of many essential machines and vehicles.

The SPC5-L9177A-K02 reference design by ST Microelectronics offers a complete solution for controlling one or two-cylinder internal combustion engines in small engine applications like motorcycles, portable generators, and agricultural and nautical engines. It enables the management of various loads found in these applications, such as injectors, relays, stepper motors, and tachometers. Additionally, it interfaces with Variable Reluctance Sensors for diagnostic monitoring and connects with main powertrain networks like the K-Line.

Compliant with significant emission control standards such as EURO4, EURO5, Bharat Stage VI, China V, and China VI, this design features a 48-pole automotive connector and protection against short circuits and over-temperature conditions on all channels. For rapid evaluation and development of basic mono-cylinder engines, ready-to-run reference design examples are available for download within SPC5Studio. This software includes a visual configuration code generation engine, board support package (BSP), startup routines, interrupt services, and a comprehensive array of low-level drivers.

Key features of the reference design include the SPC572L64F2 32-bit Power Architecture MCU with a high-performance programmable timer GTM v101 for automotive powertrain applications. It also includes the L9177A Automotive peripheral on-chip for small engine control, basic fuel injection control software for a mono-cylinder engine with a 250cc displacement, JTAG Port for debugging and programming, two injector and two coil drivers for engine management, three relay outputs, an O2 Sensor Heater driver, one High Side output, and a tachometer output signal. Additionally, it offers a conditioning circuit for Variable Reluctance Sensors, MIL output for indicating malfunction, +5V reference for external sensors, a stepper motor driver, inputs for HEGO, IAT, ECT, IPS, and TPS sensors, CAN and K-Line interface, KEY switch function, four reserved digital inputs, four reserved analog inputs, STWD100 watchdog timer, three general-purpose LEDs for status indication, and a 16 MHz crystal for clock generation. The board’s 100 x 70 mm compact allows easy integration into small engine applications.

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STMicroelectronics has tested this reference design. It comes with a Bill of Material (BOM), schematics, etc. You can find additional data about the reference design on the company’s website. To read more about this reference design, click here.

Akanksha Gaur
Akanksha Gaur
Akanksha Sondhi Gaur is a journalist at EFY. She has a German patent and brings a robust blend of 7 years of industrial & academic prowess to the table. Passionate about electronics, she has penned numerous research papers showcasing her expertise and keen insight.


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