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First of all, the control commons of idle speed adjust (ISA), power take off (PTO) and cruise control system (CCS) were concluded; and then, ISA, PTO and CCS were designed based on the software and hardware reusability and were successfully realized on GD electronic controlled diesel engine; last but not the least, the control strategies were verified on the hard in loop (HIL) bench and further on vehicle test, whose result demonstrated that the control functions based on software and hardware reusability would not affect with each other and have a satisfactory control result. By using this method, not only the duplication effort can be avoided, but the development cost can also be cut.