A control method of fuel distribution by combustion chamber zones and its dependence on injection conditions

• Main Authors: Shatrov Mikhail G., Malchuk Valery I., Dunin Andrey Y., Shishlov Ivan G., Sinyavski Vladimir V.
• Format: Article
• Language: English
• Published: VINCA Institute of Nuclear Sciences 2018-01-01
• Series: Thermal Science
• Subjects: correction injector nozzle; Diesel engine injector nozzle; injector hydraulic characteristics
• Online Access: http://www.doiserbia.nb.rs/img/doi/0354-9836/2018/0354-983618425S .pdf

A method of fuel injection rate shaping of the Diesel engine common rail fuel system with common rail injectors and solenoid control is proposed. The method envisages the impact on control current of impulses applied to the control solenoid valve of the common rail injectors for variation of the injection rate shape. At that, the fuel is supplied via two groups of injection holes. The entering edges of the first group with the coefficient of flow, μсB, were located in the sack volume and the entering edges of the second group (coefficient of flow, μсH) - on the locking taper surface of the nozzle body. The coefficients of flow, μсB, and μсH differ considerably and depend on the valve needle position. This enables to adjust the injection quantity by injection holes taking into account operating conditions of the Diesel engine and hence - by the combustion chamber zones. Using the constant fuel flow set-up, characteristic of the effective cross-section of the common rail fuel system injector holes was investigated. The diameter of injector holes was 0.12 … 0.135 mm. The excessive pressure at the entering edges varied from 30 to 150 MPa and more and the excessive pressure in the volume behind the output edge - from 0 to 16 MPa.