A system and method are provided for controlling fuel rail pressure in a common rail fuel injection system. A desired rail pressure value is determined based on signals produced by one or more sensors, a feedback PCV control signal is determined based on a difference between the desired rail pressure value and a fuel rail pressure signal, a feedforward PCV signal is determined based on the desired rail pressure value, and a PCV control signal for controlling a pressure control valve fluidly coupled to the fuel rail is determined based on the feedback PCV control signal and the feedforward PCV control signal. The pressure control valve signal is correlated with the temperature of fuel exiting the pressure control valve such that operation of the pressure control valve in response to the PCV control signal results in a valve outlet orifice size which controls the temperature exiting fuel.

Methods and systems are provided for detecting a temperature of an engine fuel rail at a plurality of locations along the engine fuel rail. In one example, a method may include detecting temperatures along the engine fuel rail with a plurality of metal film thermocouples adhered to the engine fuel rail and arranged proximate to engine fuel injectors, and adjusting fuel injector operation and/or fuel rail pressure in response to the detected fuel rail temperatures.

A fuel system is disclosed that is capable of operating in multiple combustion modes. A method is also disclosed of operating a dual fuel engine in conjunction with the fuel system. The method may include detecting a performance parameter of gaseous fuel in the fuel system. The method may also include selecting a combustion mode from a plurality of combustion modes based on the performance parameter. The method may further include injecting gaseous fuel and liquid fuel into at least one cylinder of the engine according to an injection timing corresponding to the selected combustion mode.

An apparatus and process for cooling a pressurized gas for feeding to one or more vehicle fuel tanks for fueling a vehicle can be configured so that a pressurized gas (e.g. hydrogen or natural gas) for fueling one or more vehicles can be cooled prior to dispensing via a heat transfer fluid that cools the pressurized gas and transfers the heat of the pressurized gas toward fluid of a heat sink source. The transfer of the heat to the heat sink source fluid can occur via a refrigerant in some embodiments.

An apparatus and process for cooling a pressurized gas for feeding to one or more vehicle fuel tanks for fueling a vehicle can be configured so that a pressurized gas (e.g. hydrogen or natural gas) for fueling one or more vehicles can be cooled prior to dispensing via a heat transfer fluid that cools the pressurized gas and transfers the heat of the pressurized gas toward fluid of a heat sink source. The transfer of the heat to the heat sink source fluid can occur via a refrigerant in some embodiments.

An engine includes a common rail attached to one side portion of a cylinder block that pivotally supports a crankshaft in a rotatable mariner, the one side portion extending along a crankshaft center, and the common rail being configured to supply a fuel to the engine. A flywheel housing that accommodates a flywheel that is rotated integrally with the crankshaft is disposed in one side portion out of opposite side portions of the cylinder block intersecting the one side portion. One end portion of the common rail is disposed above the flywheel housing.