Patent ID: 9239015
Filing Date: 2016-01-19
CPC Classification: F01L,F02D,Y02T

Claim Text:
1. An engine control system for a vehicle, comprising: a pressure determination module that determines a first pressure for a hydraulic fluid for intake and exhaust valve actuators of an engine; a valve control module that actuates a first valve to apply the first pressure of hydraulic fluid to an intake valve actuator of a cylinder of the engine; an adjustment determination module that receives a cylinder pressure of a first exhaust valve opening timing of a first combustion cycle of the cylinder and that determines a pressure adjustment for a second exhaust valve opening timing of a second combustion cycle of the cylinder based on the cylinder pressure of the first combustion cycle, wherein the second combustion cycle is after the first combustion cycle, wherein the adjustment determination module (i) increases the pressure adjustment as the cylinder pressure increases and (ii) decreases the pressure adjustment as the cylinder pressure decreases; a target determination module that determines a target pressure for the second exhaust valve opening timing of the second combustion cycle of the cylinder based on the first pressure and the pressure adjustment, that increases the target pressure when the pressure adjustment increases, and that decreases the target pressure when the pressure adjustment decreases, wherein the valve control module further actuates a second valve to apply the target pressure of hydraulic fluid to an exhaust valve actuator of the cylinder for the second exhaust valve opening timing; and a pump control module that, when the target pressure increases, increases an output of a hydraulic fluid pump and that, when the target pressure decreases, decreases the output of the hydraulic fluid pump.