On-board components detection of damage for control system of Diesel engine - Example

The Diesel engine without load and seed controller is a non-linear astatic object. Hence, the Diesel engine is equipped with a speed governor. The main task of the governor is counteract exceeding the speed limit. We did research on the engine with on injection pump but where the conventional centrifugal governor replace the microprocessorial controller. Microcontroller because of using a large number of electronic elements is smaller reliability in comparison with mechanical governors. In order to protect the engine from results of the controller's defect we invented a safety system. The system guarantees the controlled stoppage of the engine's work in dangerous states. Informations in this article are presented concerning protection and self-diagnostics of SW 400 engine's controlling system that makes use of DP 535 controller with Siemens 80C535 microcontroller. The being presented controlling system is successfully tested in an excavator. Copyright (C) 1998 IFAC.