Diesel engine fuel property determining device and controller
AssigneeNissan Motor Co., Ltd.
InventorTakashi Shirakawa
Life of this patent
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Abstract
In a diesel engine comprising a fuel injection pump which supplies pressurized fuel by a plunger to a fuel injection nozzle, fuel properties such as fuel viscosity are determined. A fuel supply start timing by the plunger and fuel injection start timing by the fuel injection nozzle are respectively detected, a difference between them is computed as an injection retardation period, and the fuel viscosity is determined based on the injection retardation period. A fuel injection amount, injection timing or exhaust recirculation amount are corrected based on the determined fuel viscosity, therefore errors in their control do not arise due to differences of fuel viscosity.
Claims12
A fuel viscosity detector for use with a diesel engine, said engine comprising a fuel injection pump for supplying fuel under pressure by means of a plunger and a fuel injection nozzle for injecting said fuel into a cylinder of said engine, comprising:
- means for detecting a fuel supply start timing of said plunger,
- means for detecting a fuel injection start timing of said fuel injection nozzle,
- means for calculating a difference between said fuel supply start timing and said fuel injection start timing as an rejection retardation period, and
- means for determining a fuel viscosity based on said injection retardation period.
A controller for use with a diesel engine, said engine comprising a fuel injection pump for supplying fuel under pressure by means of a plunger and a fuel injection nozzle for injecting said fuel into a cylinder of said engine, comprising:
- an actuator for varying a fuel supply start timing of said plunger according to a fuel supply start signal,
- means for detecting a fuel supply start timing of said plunger,
- means for detecting fuel injection start timing of said fuel injection nozzle,
- means for calculating a difference between said fuel supply start timing and said fuel injection start timing as an injection retardation period,
- means for computing a fluctuation amount of said injection retardation period, and
- means for advance correcting said fuel supply start signal based on said fluctuation amount.
Dependencies are inferred from the claim text.