Abstract: A fuel control system includes a target rail pressure module. The target rail pressure module determines a target fuel rail pressure of a fuel rail of a direct injection engine. An offset module determines an offset value based on an engine speed of the direct injection engine and at least one of an engine load and an air per cylinder. A modifier module determines a modifier value based on a temperature of the direct injection engine. A rail pressure control module adjusts a current fuel rail pressure of the fuel rail based on the target fuel rail pressure, the offset value and the modifier value.

Abstract: A fuel control system includes a target rail pressure module. The target rail pressure module determines a target fuel rail pressure of a fuel rail of a direct injection engine. An offset module determines an offset value based on an engine speed of the direct injection engine and at least one of an engine load and an air per cylinder. A modifier module determines a modifier value based on a temperature of the direct injection engine. A rail pressure control module adjusts a current fuel rail pressure of the fuel rail based on the target fuel rail pressure, the offset value and the modifier value.

Abstract: A method is provided for operating an internal combustion engine having a spark ignition unit. A liquid fuel is mixed with air in an injection procedure and, after ignition by the spark ignition unit, combusted while discharging mechanical power. A liquefied gas is combusted as the liquid fuel. The liquefied gas is at least partially injected using a direct injection nozzle into the combustion cylinder before the ignition by the spark ignition unit. A cooling unit cools the liquefied gas at least in a return line or a supply line.