Variable compression ratio engine
First Claim
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1. An internal combustion engine comprising:
- an engine block defining therein a combustion cylinder;
a primary piston disposed in said combustion cylinder;
a cylinderhead defining an end of said combustion cylinder;
said cylinderhead defining a secondary cylinder in flow communication with said combustion cylinder; and
a secondary piston reciprocably disposed in said secondary cylinder;
reciprocation of the secondary piston being controlled via the rotation of a cam;
said cam having drive means (1503) engageable by a corresponding drive member (1402) mounted on a separate control shaft.
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Abstract
A variable compression ratio mechanism for continuously varying the compression ratio of an internal combustion engine while minimizing the power requirement and providing internal clamping to isolate the setting mechanism from the reaction to combustion loads. The mechanism includes a setting cam (1501) actuated via an innovative torque storage system acting on an auxiliary piston (203) in the combustion chamber crown. The mechanism provides very fast and precise transient response without the use of hydraulic control. The invention desirably simplifies the control system and provides an elegant and compact solution for this purpose.
12 Citations
19 Claims
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1. An internal combustion engine comprising:
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an engine block defining therein a combustion cylinder;
a primary piston disposed in said combustion cylinder;
a cylinderhead defining an end of said combustion cylinder;said cylinderhead defining a secondary cylinder in flow communication with said combustion cylinder; and
a secondary piston reciprocably disposed in said secondary cylinder;
reciprocation of the secondary piston being controlled via the rotation of a cam;said cam having drive means (1503) engageable by a corresponding drive member (1402) mounted on a separate control shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An internal combustion engine comprising:
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an engine block defining therein a combustion cylinder;
a primary piston disposed in said combustion cylinder;
a cylinderhead defining an end of said combustion cylinder;said cylinderhead defining a secondary cylinder in flow communication with said combustion cylinder; and
a secondary piston reciprocably disposed in said secondary cylinder;
reciprocation of the secondary piston being controlled via the rotation of a cam;said cam rotatable relative to its mounting shaft (1301) and having drive means (1503) engageable by a corresponding drive member (1402) mounted on a separate control shaft. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for operating an engine comprising:
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providing a combustion cylinder having a cylinderhead at an end thereof and a primary piston reciprocally disposed in the combustion cylinder defining a combustion chamber; providing a secondary cylinder in flow communication with said combustion chamber; and a secondary piston reciprocally disposed in the secondary cylinder; and reciprocating the secondary piston in the secondary cylinder so as to maintain an optimal compression ratio for different engine load conditions. - View Dependent Claims (19)
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Specification