NL1016567C1 - Method and equipment for increasing energetic output of internal combustion engine in accordance with piston principle involve extent of volume regulated by work stroke - Google Patents

Abstract

The method and equipment for increasing the energetic output of an internal combustion engine in accordance with the piston principle involve the extent of the volume regulated by the work stroke. Two pistons (2,6) work in conjunction with one another, one of which is moved with a fixed stroke ength, whilst the stroke length of the other piston can be varied. The cylinder (1) content for combustion is determined by the adjusted stroke. The movement of both pistons is governed by a crank (4) movement with equal rotation frequency. Between the pistons is a space in which is located a compressible medium under regulatable pressure. The movement of the piston with variable stroke elngth is derived from the rotation of a crank and via a lever (11) with adjustable pivot point.

Description

Method and device for controlling the torque and power of a combustion engine according to the cleaner principle by controlling the stroke volume.

5 Combustion engines must meet increasingly stringent requirements with regard to fuel consumption and environmental impact due to the emission of combustion gases.

Through various techniques relating to fuel metering, ignition, control of valve opening, etc., both the consumption of fuel and the burden on the environment due to the emission of combustion gases are greatly reduced. The energy efficiency of the combustion engine is still low; especially with changing demand for torque and power. Important reasons for the low efficiency are the non-optimal conditions for combustion. This concerns in particular the adjustment of the quantity and composition of the fuel-air mixture to the demand for torque and power. For combustion engines according to the piston principle, piston engines, more optimum combustion conditions can be obtained by a cylinder capacity or stroke volume adapted to the demand.

The invention aims at further optimizing the energy efficiency of piston engines by controlling the volume of the stroke (stroke volume) and, at the same time, improving the power transfer to the crankshaft.

The invention is applicable to both the four-stroke and the two-stroke principle.

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The operation is explained on the basis of the enclosed principle sketch:

The explanation concerns a version according to the four-stroke principle.

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A piston, the crank piston (2), moves in a cylinder (1). The movement of the crank piston is converted via a connecting rod (3) 1016567 "2 and crank (4) into rotation of the crankshaft (5).

A second piston (6) can move in the space in which the crank piston moves (1), for example in the same cylinder. The second piston (6) moves between the crank piston (2) and the cylinder head (7). The space between the second piston (6) and the cylinder head (7) is the combustion space (8).

Between the crank piston (2) and the second piston (6) there is a space (9) filled with a gaseous medium, for example air.

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The pressure in the space (9) can be regulated.

The pressure in the space (9) relative to the pressure in combustion space (8) determines the direction in which the second piston (6) will want to move relative to the crank piston (2).

The displacement of the second piston (6) is limited by the position or displacement of the connecting part (10). The connecting part (10) forms the connection between the second piston (6) and lever (11).

The connecting part (10) permits a movement (S) of magnitude (S) relative to the second piston (6) along the axis of that piston.

The movement of the lever (11) is derived from a crank (12). The crank (12) has the same rotational speed as the crankshaft (5) of the crank piston, but is displaced relative to this in terms of crank angle.

With overpressure in space (9), the second piston (6) is pressed against the connecting part (10), the starting position. The piston (6) then follows the movement of the connecting part (10). This is the case with the intake stroke, the compression stroke and the exhaust stroke.

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With the work stroke or work stroke, the pressure in the combustion space (8) becomes greater than the pressure in space (6). The piston 1018567 (3) can thereby move in the direction of the crank piston (2) and with respect to the connecting part (10) until the pressure in the combustion space (8) and the pressure in space (9) are almost equal. The pressure in the combustion chamber (8) is transferred via the buffer in chamber (9) to the crank piston (2) which then causes the crankshaft (5) to rotate, and if the pressure in the combustion chamber (8) decreases further, the piston ( 6) back to the starting position with respect to the connecting part (10).

The forces on the movement mechanism of the piston (6) remain limited.

By buffering in space (9), the force on the crank piston (2) is transferred more gradually.

The lever (11) rotates about an axis (13), the tilting point. The position of the tipping point (13) can be adjusted relative to the lever (11); for example, by rotating the tilting point about axis (14).

Shaft (14) is positioned in such a way that the stroke of the connecting part (10) can be varied, while the desired compression is produced in the combustion space (8) at the desired moment. (The pressure in space (9) must, at that time, be higher than the pressure at compression.) Possible correction of the position of piston (6) is possible, for example, by eccentrically bearing shaft (14) and in provide a setting option (not shown).

The stroke of the connecting part (10) is the measure of the cylinder capacity or the stroke volume.

The maximum stroke of the connecting part (10) corresponds to the stroke of the crank piston (2).

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Claims (4)

Method and elements according to claim 1, characterized in that in each case two pistons work together, one piston displacing a fixed stroke length, while the stroke length of the other piston can be varied. Conclusion 3. Method and elements according to claims 1 and 2, characterized in that the cylinder capacity for combustion is determined by the set stroke. Claim 4. Method as well as elements according to claims 1. and 2. characterized in that the movement of both pistons is derived from a crank movement with the same rotational frequency. Conclusion 5. Method and elements according to claim 1., 2. and 4. characterized in that there is a space between the pistons in which a compressible medium is located under controllable pressure. Conclusion 6. Method and elements according to claim 1, 2. and 4. characterized in that the movement of the piston with variable stroke length is derived from the rotation of a crank and is transmitted to said piston via a lever with adjustable tilting point. 1016567a Claim 7. Method as well as elements according to claim 6. characterized in that the adjustment of the tilting point of the lever determines the positions and the magnitude of the stroke of the piston with variable stroke. Claim 8. Method as well as elements according to claims 6. and 7. characterized in that the connection of the lever to the variable-stroke piston permits displacement along the axis of the piston. Claim 9. Method as well as elements according to claim 8. characterized in that the forces at the operating stroke are transferred via a buffer to the fixed-stroke piston. 20 25 30 35 1016557 1