INJECTOR PROTECTION CONTROL METHOD, AND COMMON RAIL FUEL INJECTION CONTROL DEVICE

摘要

It is possible to certainly prevent the functional decline of an injector due to raising of temperature of an excess fuel in the injector without adding another component. When it is judged that engine revolutions Ne, a vehicle speed V and a rail pressure exceed the determined criterion of each, the counted value of a judgment counter is increased (Steps S100 to S106). When it is not judged that the engine revolutions Ne, the vehicle speed V and the rail pressure exceed the determined criterion of each, the counted value of the judgment counter is reduced (Steps S108 to S114). Next, when it is judged (Step S116) that the counted value of the judgment counter exceeds the predetermined starting criterion Cs, fuel injection and the rail pressure are restricted and a smoke limit value is corrected (refer to steps S120 to S124) to protect the injector until the counted value of the judgment counter falls to below the predetermine protection start criterion.