Method for determining injection valve characteristic of injection valve of internal combustion engine in vehicle, involves determining multiple pressure difference values for multiple injection cycles of cylinders

摘要

The method involves determining multiple pressure difference values for multiple injection cycles of the cylinders (2 to 5) with different valve controlling time periods. A fuel pressure value is detected in a pressure tube (14) before a fuel injection process in the cylinders, while another fuel pressure value is detected in the pressure tube after the fuel injection process in the cylinders. The pressure difference value is determined on the basis of the detected fuel pressure values. The injection valve characteristic is determined by a fuel injection quantity value. Independent claims are included for the following: (1) a device for determining injection valve characteristic of injection valve of internal combustion engine; and (2) a method for reducing an injection quantity difference in an internal combustion engine with multiple cylinders.