A dual-fuel engine and combustion control method based on variable injection law

By employing a variable injection pattern design in a dual-fuel engine, combined with multiple modules and control methods, the combustion lag problem caused by low-carbon fuel injection has been solved, achieving efficient and clean combustion under all operating conditions, and improving the low-carbon fuel substitution rate and engine thermal efficiency.

CN117404199BActive Publication Date: 2026-07-21HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN ENG UNIV
Filing Date
2023-11-16
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing dual-fuel engines suffer from combustion lag and slowdown after the injection of low-carbon and carbon-free fuels, resulting in increased engine cycle variation and decreased thermal efficiency, as well as increased emissions of unburned hydrocarbons. Current control methods cannot achieve efficient, clean and stable combustion across the entire operating range.

Method used

The dual-fuel engine design based on variable injection law includes cylinder walls, cylinder head, piston, intake valve, exhaust valve, diesel injection module and second fuel injection module. It controls the injection mode of low-carbon fuel through variable injection law, and combines a two-stage turbocharger module, accumulator chamber, super hysteresis electromagnetic control needle valve limit module and control valve assembly to achieve flexible injection control under different load conditions.

Benefits of technology

It achieves low-carbon, high-efficiency, clean and stable combustion across the entire operating range, improves the substitution rate of low-carbon fuels, reduces carbon emissions and unburned fuel emissions, and improves engine thermal efficiency.

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Abstract

The application aims to provide a dual-fuel engine and a combustion control method based on variable injection law, which comprises two sets of fuel injection modules on the engine cylinder head, namely a diesel injection module and a second fuel injection module for injecting low-carbon or zero-carbon fuel, both of which can realize variable injection law and directly inject dual fuel into the combustion chamber. According to the operation condition requirement of the engine, the second fuel injection module realizes flexible and variable injection law of low-carbon or zero-carbon fuel, such as base pressure injection, boot-shaped injection, supercharged injection and multi-injection, and accurately controls the distribution of low-carbon or zero-carbon fuel mixture in the combustion chamber. A small amount of diesel is injected to ignite the mixture in the combustion chamber, and the combustion is actively controlled. The engine realizes low-carbon, high-efficiency, clean and stable combustion mode in the full working condition range.
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