Patent ID: 8602002

Claim:
A control system for an engine, comprising: a knock control module that adjusts a period that one or more of an intake valve and an exhaust valve of a cylinder are open based on engine knock corresponding to the cylinder; and a valve control module that, based on the adjusted period, controls the one or more of the intake valve and the exhaust valve using one or more electro-hydraulic actuators, wherein the valve control module controls the one or more of the intake valve and the exhaust valve without a camshaft, wherein each of the one or more electro-hydraulic actuators includes: a hydraulic actuator; a valve; a return spring connected between the hydraulic actuator and the valve; an internal feedback system in fluid communication with the hydraulic actuator; a three-way solenoid in fluid communication with the internal feedback system, a first pressure rail, the valve, and a second pressure rail; a first two-way solenoid in fluid communication with the internal feedback system, the hydraulic actuator and a third pressure rail; and a second two-way solenoid in fluid communication with the valve and the third pressure rail, and wherein the second pressure rail supplies a higher pressure than the first pressure rail and wherein the third pressure rail supplies a lower pressure than the first pressure rail.