Fuel injection device

摘要

An injector (3) includes a simple model structure and the time required for the operation of an injection cycle is divided into a first period (Tds1), a second period (Tds2), and a third period (Tds3). The first period (Tds1) is from when an injection pulse is generated until when a valve (34) starts ascending. The second period (Tds2) is until when the valve (34) is fully opened. The third period (Tds3) is until when the pressure (Pcc) in a control chamber (33) decreases to a valve-opening pressure (Popn). These periods are calculated by using a simple formula. The injection start delay time (Tds) is determined from the sum thereof. This technology does not require tremendous amounts of conformance data for calculating the injection start delay time (Tds). Even when the specifications of the injector (3) are partly changed, conformance processing can be executed by changing conformance parameter in the changed portions of the process through a decreased number of steps.