Method for determining the amount of fuel leaving an injector

摘要

A method for determining the quantity of fuel leaving an injector of a direct-injection diesel engine, the quantity of fuel supplying a cylinder of the engine in which a piston moves, the injection of fuel being performed by a pilot injection during which a first quantity of fuel is injected into the cylinder followed by a main injection during which a second quantity of fuel, greater than the first quantity of fuel, is injected into the cylinder, the method including the following steps: a) operating the engine at idle speed, b) determining the maximum pressure in the cylinder, and c) determining, from the maximum pressure, the quantity of fuel injected into the cylinder during the pilot injection, by way of a predefined one-to-one relationship, at idle speed, between a maximum pressure value in the cylinder and a quantity of fuel injected into the cylinder during the pilot injection.

主权项

1. A method for determining a quantity of fuel leaving an injector of a direct-injection diesel engine, said quantity of fuel supplying a cylinder of said engine in which a piston moves, the injection of fuel being performed by a pilot injection during which a first quantity of fuel is injected into the cylinder followed by a main injection during which a second quantity of fuel, greater than the first quantity of fuel, is injected into the cylinder, said method comprising:
a) operating the engine at an idle speed; b) determining a maximum pressure in the cylinder; and c) determining, from said maximum pressure, the quantity of fuel injected into the cylinder during the pilot injection, by means of a predefined one-to-one relationship, at the idle speed, between a maximum pressure value in the cylinder and a quantity of fuel injected into the cylinder during the pilot injection.