International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

During the decades-long development of internal combustion engines, the main criteria for optimality were the increased power, the low fuel consumption and the adjustment of the working process under non-stationary operating conditions. Even when the air quality in some settlements was significantly worsening, due to the high degree of motorization, special attention has been paid to polluting the atmosphere with exhaust gases from the engines. Problems that are created due to the increased environmental pollution significantly influence the choice of providing minimal environmental conditions, they receive priority, especially in urban areas. As toxic components are considered CO, CnNm, NOx, solid particles, etc. So if we know the conditions in which they are created then they can be the criterion for optimality. The requirements also affect their reduction within certain permitted limits.

By applying a complex, exact and scientific approach, was performed the development, calculation and analysis of a complex pilot installation (bioenergetics system consisting of the following elements: greenhouse for early vegetation crops, digester and internal combustion engine powered by biogas). Using the factorial experiment, i.e. applying the matrix of influence, a complete optimization of the internal combustion engine was performed in function of the other elements of the installation. An analysis is also made from the aspect of the positive current EU regulations in the field of air pollution.

Safety engineering is consistently promoted and there is an evident need for improvement and development. The maintenance process is dependent on the method of editing and organizing the setup and execution of such kind commitments.
Working with the maintenance system itself determines the manner of maintenance.
Тhe contractor’s responsibility for providing a high level efficiency of system maintenance because the process involves detecting and reducing degradation and restoring the functions of the system in working order.
The purpose of this paper is to overcome the shortage of updating data for occupational safety for maintenance, knowledge and to introduce new methods to protect workers and the working environment, as well as monitoring the current trends and standards.