Control method and device for airless injection of leak-tightness oil injector

Abstract

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.

Description

technical field [0001] The present application relates to the field of automatic control, in particular to a control method and device for empty injection of a non-leakage fuel injector. Background technique [0002] With the upgrading of exhaust emission standards, the ultra-high pressure common rail system has become inevitable, making the configuration of non-leakage injectors more and more common. [0003] Although this kind of non-leakage injector reduces the oil supply loss, but also due to its small static leakage, after the engine is stopped, the pressure in the common rail pipe of the ultra-high pressure common rail system cannot be released. In this way, when the engine starts again, The high rail pressure in the common rail will have a certain impact on the components of the fuel system and affect the life of the components. At the same time, the higher rail pressure also brings higher risks to shutdown maintenance. [0004] It can be seen that after the engine ...

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Problems solved by technology

[0003] Although this kind of non-leakage injector reduces the oil supply loss, but also due to its small static leakage, after the engine is shut down, the pressure in the common rail pipe of the ultra-high pressure common rail system cannot be released. In this way,...

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