In order to understand what engineering enterprises undertake to gain competitive advantages in global reality it is necessary to verify the relationship between knowledge management, engineering processes, organizational culture and innovation. It is vague whether and how knowledge management supports engineering processes and through mediating effect of the knowledge management capability affects the competitive advantage. Just to make a first step in closing this gap we contribute an empiric research in which 35 engineering enterprises were involved. The research model is built up in which a mediated variable – knowledge management capability is introduced. The multi regression analysis is applied to analyze the model. We found innovation and typification of engineering processes can promote knowledge management capability and thus enhance the competitive advantages of engineering enterprises. The contribution of this paper is mainly practical. First engineering processes have a fundamental role in gaining competitive advantage. Given results demonstrate the significance of knowledge management capability. As engineering enterprises continue focus on the development of their engineering processes they develop sustainable competitive advantage through the strength of the knowledge management capability.