METHOD FOR PROVIDING VARIABLE COMPRESSION RATIO IN AN INTERNAL COMBUSTION ENGINE AND ACTUATOR FOR SAID METHOD
First Claim
1. A method to control the size of a combustion chamber by an actuator in the cylinder head of a piston combustion engine comprising:
- A vertically displaceable piston;
A first chamber with a piston;
associated shaft having a flange and a spring in the chamber acting between the flange and a chamber floor to reposition the piston in an upward direction;
Wherein the actuator further comprises a second chamber and a third chamber filled with hydraulic fluid and separated by a valve with an opening, wherein the valve is horizontally repositionable via an electromagnet;
Wherein the actuator further comprises a step motor and a shaft vertically displaceable by said step motor in the second chamber, the method comprising;
Changing the size of the combustion chamber by displacing the valve with the electromagnet so that the opening connects the second and third chambers.
1 Assignment
0 Petitions
Accused Products
Abstract
In a combustion chamber of a piston combustion engine there is a displaceable piston that can be moved progressively up or down between an upper and a lower turning position. The displacement takes place via an electrically controlled step motor which is connected to the piston via a hydraulic link, including a hydraulic lock. The lock is deactivated during the displacement a certain number of steps up or down ordered by a motor control system, and when the displacement is ended, the lock is activated by said engine control system and the moving piston is locked in a certain position ordered by the motor control system.
4 Citations
8 Claims
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1. A method to control the size of a combustion chamber by an actuator in the cylinder head of a piston combustion engine comprising:
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A vertically displaceable piston; A first chamber with a piston;
associated shaft having a flange and a spring in the chamber acting between the flange and a chamber floor to reposition the piston in an upward direction;Wherein the actuator further comprises a second chamber and a third chamber filled with hydraulic fluid and separated by a valve with an opening, wherein the valve is horizontally repositionable via an electromagnet; Wherein the actuator further comprises a step motor and a shaft vertically displaceable by said step motor in the second chamber, the method comprising; Changing the size of the combustion chamber by displacing the valve with the electromagnet so that the opening connects the second and third chambers. - View Dependent Claims (2, 3, 4, 5, 7, 8)
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6. An actuator comprising:
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a combustion chamber; a vertically displaceable piston; a chamber with a piston associated shaft with a flange; a spring between the flange and a chamber floor; two hydraulic fluid chambers; a valve with an opening; an electromagnet; a step motor; and a shaft displaceable in one of the hydraulic fluid chambers; wherein a size of the combustion chamber is changeable when the valve is displaced so that the opening connects the two hydraulic fluid chambers.
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Specification