Matching Calculation Method for Flow-Limiting Valve of High-Pressure Common Rail System

WANG Min; KANG Yanhong; MA Liang; YANG Xianfeng; LI Huale

doi:10.3969/j.issn.1001-2222.2021.04.011

Vehicle Engine ›› 2021, Vol. 0 ›› Issue (4) : 70. DOI: 10.3969/j.issn.1001-2222.2021.04.011

Matching Calculation Method for Flow-Limiting Valve of High-Pressure Common Rail System

WANG Min，KANG Yanhong，MA Liang，YANG Xianfeng，LI Huale

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Abstract

The flow-limiting valve is a pressure protection device for the case that the injector is stuck or the pipeline leaks in the high-pressure common rail system, which can cut off the fuel flow when the fuel injection volume or leakage rate is large. The match and calculation of flow-limiting valve and injector were conducted, the calculation formula of spool displacement and movement period were derived through the simplified processing of physical model and the calculation process, and the calculation accuracy of formula was verified through the tests. The judgment references were determined for three close cases of working flow-limiting valve and the matching curve with the characteristics of injector was drawn. The matching of the structure parameters of flow-limiting valve and the injector could be accurately designed according to the injection volume and duration based on the results.

Key words

high-pressure common rail system / flow-limiting valve / valve spool displacement / movement period / close flow / matching calculation / close criterion

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WANG Min，KANG Yanhong，MA Liang，YANG Xianfeng，LI Huale. Matching Calculation Method for Flow-Limiting Valve of High-Pressure Common Rail System[J]. Vehicle Engine. 2021, 0(4): 70 https://doi.org/10.3969/j.issn.1001-2222.2021.04.011