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Klaus, R. and Urbaniak, A.
Safety algorithms for excavator engine control
Automation in Construction 7 (5) (1998) pp. 391-400
The diesel engine without load and speed controller is a nonlinear astatic object. The torque and moment of internal friction (the diesel engine without load and governor) cross in the field of the engine's destruction (the speed limit was exceeded). Hence, the diesel engine is equipped with a speed governor. The main task of the governor is to counteract exceeding of the speed limit. We did a research on the engine with an injection pump wherein the conventional centrifugal governor was replaced by the microprocessor controller. This is because using a large number of electronic elements microcontroller has smaller reliability in comparison with mechanical governors. In order to protect the engine from the 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. Information in this article are presented concerning protection and self-diagnostics of SW 400 engine control system that makes use of DP535 controller with Siemens 80C535 microcontroller. The presented control system is successfully tested in an excavator.