SU1451303A1 - Method of operating an i.c. engine - Google Patents

Abstract

The invention allows to improve the technical and economic performance of the engine. When the piston moves from the top dead center (MT) to the lower MT, a working stroke occurs (the process of expanding the combustion products). At the bottom MT, the piston is temporarily stopped and exhaust gas is released from the cylinder. The piston then moves from the lower MT to the intermediate position. Exhaust gas subtraction occurs. In the intermediate position, the piston stops. At this time, the processes of purging and filling the cylinder with fresh charge are carried out. Then the piston moves to the upper MT. The working charge is compressed, and at the end of compression, the charge is ignited. The combustion process occurs near the upper MT with a temporary stop of the piston. 2 Il.

Description

The invention relates to mechanical engineering, in particular to engine building, and in particular to methods of operation of two-stroke internal combustion engines.

The aim of the invention is to improve the technical and economic indicators of the engine.

In FIG. 1 shows the law of motion of the piston in the process of implementing the method of operation; in FIG. 2 - kinematic diagram of an engine with a crank mechanism, allowing to implement the proposed method.

The method can be implemented on an engine containing a cylinder 1 with a piston 2 and a connecting rod 3, the lower head of which is connected to the neck 4, mounted on the periphery of the movable gear 5 (the axis of the neck 4 coincides with the dividing line of the movable gear 5), rotating on the neck 6 of the crank 7 and connected to the fixed gear <8. Gears have an equal number of teeth.

When the crank 7 rotates, the movable gear 5 rolls around the stationary gear 8, and the lower head of the connecting rod 3 moves along the curve shown in FIG. 2. Piston 2 makes instant stops at TDC and BDC, as well as in an intermediate position. To increase the duration of piston stops, the method can be implemented in an engine, the design of which provides oscillatory motion of the piston near the middle dead center, namely in this design the axis of the neck 4 will be between the dividing line of the movable gear 5 and its periphery.

To implement the described method, an axial piston engine can be used, having a fixed housing with inlet and outlet channels, a rotor with cylinders parallel to the axis of rotation of the shaft, in which pistons are arranged, reciprocating and connected by means of a roller block, with a curved track working distribution part, which sets the law of movement of the pistons (along the curve in Fig. 1).

The method is as follows.

When the piston moves from TDC to BDC (Fig. 1, ab), a working stroke occurs (the process of expansion of combustion products). In the BDC (Fig. 1, bb), the piston is temporarily stopped, the exhaust channel opens, and the exhaust gases are freely released from the cylinder. Then the piston moves from the BDC to the intermediate position. Subtraction of exhaust gases occurs (Fig. 1, vg). In the intermediate position, the piston stops, and at this time the processes of purging and filling are carried out due to the excess pressure created in the inlet channel by the supercharger (Fig. 1, dd). The location at which the piston is temporarily stopped is determined depending on the required compression values and the degree of expansion of the working fluid. After stopping, the piston moves to TDC, the working charge is compressed (Fig. 1, de), and at the end of compression, the charge ignites. The combustion process occurs near TDC (Fig. 1, ea) with a temporary stop of the piston.

Claims (1)

Claim The method of operation of a piston internal combustion engine by purging the cylinder, filling it with a fresh charge, compressing the mixture when the piston moves to top dead center, burning it, expanding the combustion products when the piston moves to bottom dead center, exhaust gas when the piston is near the bottom dead center and ejection by the piston of exhaust gases when it moves to top dead center, characterized in that, in order to improve technical and economic indicators, when the piston moves to top dead center the time they expel the exhaust gases, the latter is stopped in an intermediate position, and the cylinder is purged and filled with a fresh charge when the piston stops.