A Novel Extended Expansion Engine Mechanism

Abstract

Due to the increasing population and intense energy consumption, energy efficiency and efficient use of energy in the power units in the vehicle are important concepts for our earth. Particularly in hybrid engine vehicles produced in recent times, Atkinson (or Miller) internal combustion engines are preferred over conventional internal combustion engines. Atkinson's work from 1882 to the present day in many extended expansion engine mechanism design is presented. This paper deals with the design of a novel extended expansion engine mechanism that is intended to achieve trefoil hypotrochoid curve motion in the crankshaft connection using the planetary gear system. The kinematic equations related to the presented new crank-conrod mechanism have been obtained and compared with the conventional crank-conrod mechanism. As a result of the paper, the equations required for kinematic analysis were derived, and the kinematic data of the novel designed mechanism were compared and evaluated according to the data of the conventional system. As a result of this evaluation, it was shown that the desired extended expansion stroke could be obtained by using this mechanism and the parameters affecting the kinematic analysis were determined. However, it has been seen that by changing the critical design parameters, different piston path can be achieved with the novel designed mechanism.

Keywords

• extended expansion
• planetary gear mechanism
• kinematics
• crank-conrod mechanism
• trefoil hypotrochoid curve