A hydrogen injection testing device and method for a direct injection hydrogen internal combustion engine

Abstract

The invention discloses a hydrogen injection test device and method for a direct injection hydrogen internal combustion engine. The device includes: a hydrogen supply module, a hydrogen injection module and a control module; the hydrogen injection module includes: a hydrogen mass flow meter, a hydrogen rail, and a transient pressure Sensors, steady-state pressure sensors, hydrogen nozzles and nozzle joints; the hydrogen supply module communicates with the intake end of the hydrogen rail through a gas supply pipeline, and the hydrogen supply module is used to provide hydrogen to the hydrogen injection module; the hydrogen rail There are more than two gas outlets, which are respectively communicated with more than two hydrogen nozzles through nozzle joints; the transient pressure sensor and the steady-state pressure sensor are respectively installed on the hydrogen rail; the hydrogen mass flow rate is installed on the gas supply pipeline. The invention can test and verify the hydrogen supply and hydrogen injection capacity of the direct injection hydrogen internal combustion engine, optimize the nozzle combination with better consistency, and calculate the difference of each cylinder of the direct injection hydrogen internal combustion engine.

Description

technical field [0001] The invention belongs to the technical field of in-cylinder direct injection hydrogen internal combustion engine and hydrogen injection, and in particular relates to a hydrogen injection test device and method for direct injection hydrogen internal combustion engine. Background technique [0002] Hydrogen is a clean fuel with zero carbon emissions. The hydrogen-burning internal combustion engine has good emission characteristics, only nitrogen oxides and water are produced after combustion, and the nitrogen oxides can be reduced to a much lower level than other fuels when the lean mixture is burned, so it is an ideal "green" fuel . In recent years, countries all over the world are also actively devoting themselves to the development of hydrogen internal combustion engines and automobiles. [0003] Hydrogen internal combustion engines are mainly divided into two types according to the air intake organization: port injection and direct injection in the...

AI Technical Summary

Problems solved by technology

[0004] However, the flow rate characteristics of direct injection hydrogen nozzles are sensitive to injection pressure and electronic control conditions. The inconsistency of flow rates between different nozzles will lead to large differences between cylinders when the internal combustion engine is running, thus affecting the stability of the whole machine.

In order to ensure the stability of the injection pressure at the front of the nozzle under high flow rate, a hydrogen track needs to be arranged at the front of the nozzle. Due to the limitation of space, the volume of the hydrogen track should not be too large, and simultaneous injection of multiple nozzles will also affect each other.

In addition, due to the small size of hydrogen molecules, there are inevitably some leakage problems in the assembly of hydrogen nozzles on internal combustion engines, and its leakage is difficult to estimate. After shutdown, hydrogen will continue to leak into the sealed cylinder, which brings safety risks. avoid

Images