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US 8,577,581 B2Granted
Injector protection control method and common rail fuel injection control system
AssigneeBosch Corporation
InventorsShinichi Hirota, Tomonori Watanabe
Life of this patent
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AssigneeBosch Corporation
InventorsShinichi Hirota, Tomonori Watanabe
Estimating the term…
To reliably prevent a drop in the function of injectors resulting from a rise in the temperature of excess fuel in the injectors without having to add a new part. In a common rail fuel injection control system according to the present invention, when it is determined that an engine rotational speed Ne, a vehicle velocity V and a rail pressure exceed respective predetermined references, the count value of a determining counter is increased (steps S100 to S106), and when it is determined that the engine rotational speed Ne, the vehicle velocity V and the rail pressure do not exceed the respective predetermined references, the count value of the determining counter is decreased (steps S108 to S114), and next, when it is determined (step S116) that the count value of the determining counter exceeds a predetermined protection initiation reference Cs, limitation of the fuel injection amount and the rail pressure and correction of a smoke limit value are performed (see steps S120 to S124) until the count value of the determining counter falls below the predetermined protection initiation reference, whereby injector protection is performed.
An injector protection control method in a common rail fuel injection control system, the method comprising:
A common rail fuel injection control system that is configured such that fuel inside a fuel tank is pressurized and pressure-fed by a high pressure pump and accumulated in a common rail and the high pressure fuel is supplied to injectors that are connected to the common rail to enable fuel injection by the injectors and which includes an electronic control unit that controls operation of the high pressure pump and the injectors, wherein
An injector protection control program that is executed in an electronic control unit of a common rail fuel injection control system that is configured such that fuel inside a fuel tank is pressurized and pressure-fed by a high pressure pump and accumulated in a common rail and the high pressure fuel is supplied to injectors that are connected to the common rail to enable fuel injection by the injectors and which includes the electronic control unit that executes drive control of the high pressure pump and the injectors, the injector protection control program comprising the steps of:
Dependencies are inferred from the claim text.