We are at a time when internal combustion engines still dominate in transport, managing your surroundings ... But on the other hand, have sometimes been superseded by electric motors, which are more environmentally friendly, quiet, have better efficiency, etc. But electric motors have some drawbacks, which are crucial in the work and use, and therefore can not break through to areas dominated by internal combustion engines. Namely, for the operation of the electric motor need to be supplied with electricity. The most common source of the battery and the electrical wiring in the house. Batteries are heavy, and quickly emptied, with electrical wiring, we are limited by the length of the electrical conductor.
Internal combustion engines can be divided into two-stroke and four-stroke. Four-stroke are the most common and more environmentally friendly. They are found in the majority of transport equipment and machinery. Yet the two-stroke engines still leading in conditions which require action in all possible positions.
In this thesis, we focused only on two-stroke engines, because its construction is simpler and more affordable than four-stroke, which leads to an inexpensive and simple performance measurement system to determine the efficiency of a two-stroke engine.
In the theoretical part, we made the division of the internal combustion engine by way of fueling and the number of cycles. Otherwise, there are several possible division, but most of us were interested in the comparison of two-stroke and four-stroke engines, their weaknesses and strengths and the main reason for the application and the final selection of the two-stroke engine. Below we wrote a history of the development of two-stroke engines and their detailed structure.
We also reviewed the curricula of elementary and secondary schools and determine what students deal with and learn about them. We also checked how many of these tasks the internal combustion engine is in the national Assays knowledge.
In the empirical part, we describe a system for measuring the efficiency of a two-stroke engine in a school laboratory. We went course design, fabricate system and the typical measurement results. We measured fuel consumption and engine torque at certain speeds and at a certain load and also studied the efficiency two-stroke engine.
The master's thesis, we have included the course of producing and processing engine and the entire course of the measurement, so that you can master the techniques and technology or a school laboratory conducted himself. Especially the technology teachers in elementary schools, now would be inexpensive and easy to carry out measurements with the students and encourage them to continue growing interest on internal combustion engines.