Hw/sw Co-design of a Multi-injection Driver for Engine Control Systems

The driver is for a direct injection engine with 2 to 4 cylinders. There is one injector for every cylinder. To guarantee the pressure to be constant during every single injection stroke not more than 4 concurrent injections may be performed. As a consequence, for engines with at most 4 cylinders, every cylinder may be considered independent. Therefore, we may focus on the design of the driver for a single cylinder and compose the behavior of the whole driver system in a modular fashion. So, the design we achieve is highly modular and, theoretically, may be used for an engine with an arbitrary number of cylinders, provided the pressure in the fuel rail is guaranteed to be constant during each injection stroke. The real challenges of the design, however, are the tight time constraints and the high precision requirements. Both of these will be described in Section II.