Electro-mechanical hydraulic valve lifter for precise control of fuel consumption

A system of electro-mechanical hydraulic valve lifters for varying the opening of intake and exhaust valves for a piston engine, the system comprising:

• a plurality of electro-mechanical hydraulic valve lifters, each lifter comprising a hollow body, a hollow plunger slidably enclosed within the body, a hollow magnetorheological fluid chamber slidably enclosed within the plunger, wherein the magnetorheological fluid chamber contains magnetorheological fluid sealed within;
• a perforated piston slidably enclosed within the magnetorheological fluid chamber, and attached to a moveable rod attached to an intake port or an exhaust port, wherein the perforated piston compresses the magnetorheological fluid;
• at least one electromagnet surrounding the body of each electro-mechanical hydraulic valve lifter, wherein the at least one electromagnet is operatively attached to a control module, wherein the control module is operatively attached to at least one engine sensor;
• wherein the control module is configured to receive a plurality of signals from the at least one engine sensor, wherein the control module is configured to send various levels of voltage to the at least one electromagnets to control a viscosity of the magnetorheological fluid to control the compression of the magnetorheological fluid by the perforated piston, to control the intake port or the exhaust port.