The embodiment of the invention discloses a control method and device for airless injection of a leak-tightness oil
injector. The control method comprises the steps that after an engine shuts down, when the
rail pressure of the interior of a
common rail pipe is excessively high, dynamic leakage, that is an airless injection method of the leak-tightness oil
injector is used for discharging
high rail pressure of the interior of the
common rail pipe, specifically, a shut-down
signal of the engine is responded, and whether the
rail pressure of the interior of the
common rail pipe is greater than apreset threshold value or not is judged according to a
rail pressure signal; if yes, the condition that the rail pressure of the interior of the common rail pipe is excessively high is illustrated; and in order to prevent the influence brought by the excessively
high rail pressure of the interior of the common rail pipe, the oil
injector is controlled to conduct airless injection for pressure discharging, the oil injector is controlled to stop airless
injection pressure discharging until a preset stopping condition is achieved, the purpose that after the engine shuts down, the excessively
high rail pressure of the interior of the common rail pipe is discharged is achieved, when the engine is started again, the condition that
impact of the excessively high rail pressure of the interior ofthe common rail pipe on parts and components of a fuel
system influences the service life of the parts and the components is prevented, and meanwhile, high risks for halt maintenance brought by the excessively high rail pressure are avoided.