Thermal load control system and method for high-pressure direct injection injector in cylinder with micro-diesel pilot ignition

A control system and injector technology, which is applied in fuel injection devices, charging systems, machines/engines, etc., can solve problems such as high heat load and injector burnout, so as to prevent excessive temperature, improve reliability, and overcome Effects of excessive heat load
CN104832337BActive Publication Date: 2016-01-27SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2016-01-27

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Abstract

The invention discloses a system and a method for controlling a thermal load of a high-pressure direct injector in a trace diesel ignition cylinder. The method comprises the following steps of an ECU (Electronic Control Unit) is respectively connected to a natural gas injection control electromagnetic valve, a diesel injection control electromagnetic valve, a cooling diesel quantity control valve and an injector thermal load monitoring feedback system; the diesel / natural gas injector is respectively connected to the natural gas injection control electromagnetic valve and the diesel injection control electromagnetic valve; an annular cooling oil cavity is arranged in a needle valve body of the diesel / natural gas injector; after the cooling diesel enters the annular cooling oil cavity to cool the needle valve body of the injector, the cooling diesel flows into a diesel return pipeline. The system and the method have the beneficial effects that the thermal load of the needle valve body of the direct injector can be effectively controlled to prevent faults, such as burning loss, blockage and coking, of the needle valve body of the injector due to the excess temperature of the needle valve body of the direct injector.
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Description

technical field

[0001] The invention relates to the technical field of internal combustion engines, in particular to a thermal load control system and method for a high-pressure direct-injection injector in a trace diesel pilot combustion cylinder. Background technique

[0002] A trace amount of diesel ignites the in-cylinder high-pressure direct-injection natural gas engine. Due to the natural gas diffusion combustion method, the combustion speed is fast and the knocking tendency is small. Valve structure, small throttling loss, high charge coefficient; using natural gas as the main fuel, low C / H ratio, reducing particulate matter and greenhouse gas emissions, low adiabatic flame temperature, NO x The emission control is relatively easy, almost no fuel enters the exhaust system during the scavenging process, and the HC emission is low. Therefore, this type of engine can achieve better emission performance without sacrificing power, and has good application value.

[0003] ...

Claims

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