Abstract: A method and a system for determining a temperature for pressurized fuel included in a high pressure fuel system arranged for providing fuel to an engine are presented. The method includes determining a first temperature for a first fuel volume included in a first section of the high pressure fuel system, where the first section includes a common rail fuel system. The method further includes determining a second temperature for a second fuel volume included in a second section of the high pressure fuel system, where the second section includes at least one fuel injector arranged in a cylinder head of the engine. The method also includes the step of determining the temperature for the pressurized fuel based at least on the first temperature and on the second temperature.

Abstract: A method and a system for determining a temperature for pressurized fuel included in a high pressure fuel system arranged for providing fuel to an engine are presented. The method includes determining a first temperature for a first fuel volume included in a first section of the high pressure fuel system, where the first section includes a common rail fuel system. The method further includes determining a second temperature for a second fuel volume included in a second section of the high pressure fuel system, where the second section includes at least one fuel injector arranged in a cylinder head of the engine. The method also includes the step of determining the temperature for the pressurized fuel based at least on the first temperature and on the second temperature.

Abstract: Method, system, and computer program product are provided for determining pressure in a fuel accumulator tank of a multi cylinder internal combustion engine during operation. Pressurized fuel is distributed from said accumulator tank to the cylinders by fuel injectors. A pump unit provides pressurized fuel to said accumulator tank by pump actions comprising pump strokes. The method comprises: performing pressure sampling of pressure in the fuel accumulator tank based upon a relationship between the number of pump strokes and a number of injections per crank shaft revolution such that pressure sampling occurs in connection to a fuel injection where the mutual relationship between that fuel injection and the pump action reoccurs at the fuel injection for which a pressure is to be determined; and determining a pressure in the fuel accumulator tank based upon the pressure sampling in connection to at least one earlier fuel injection, for controlling fuel injection to an individual cylinder.

Abstract: Method for error detection in a fuel-supply system includes determining (s410) a prevailing operating status in the engine (280), determining (s415) whether the determined operating status corresponds to a predetermined operating status, which operating status is regarded as stationary; continuously determining (s420) a progression in the fuel-supply pressure (P_rail) during the prevailing operating status; determining (s430) the number of occasions (N) within a specified period (DT) that the fuel-supply pressure (P_rail) alternately reaches a maximum or minimum value that deviates from a predetermined reference value (P_rail_ref) by more than a predetermined deviation value; and if the number of occasions (N) exceeds a specified value (TH), this indicates that the valve device (250) is not functioning as intended. Also a computer program product comprising program code (P) for a computer (200; 210) for implementing the method. Also a device and a motor vehicle equipped with the device.