Diesel engine flexible boost control method

Abstract

The invention aims at providing a flexible supercharging system of a diesel engine and a control method of the flexible supercharging system. The flexible supercharging system comprises the diesel engine, an exhaust gas turbine and a gas compressor, wherein the exhaust gas turbine is connected with the diesel engine through an exhaust pipe; the gas compressor is connected with the diesel engine through an air inlet pipe; the exhaust gas turbine is connected with the gas compressor through a hydraulic coupler; the air inlet pipe is provided with an intercooler; the exhaust pipe is branched to form an exhaust gas control pipe communicated with the atmosphere; the exhaust gas control pipe is provided with an exhaust gas control valve; the air inlet pipe located between the intercooler and the gas compressor is branched to form an air control pipe communicated with the atmosphere; the air control pipe is provided with an air control valve; an outlet of the gas compressor is provided with a pressure sensor; and a shaft where the exhaust gas turbine is connected with the hydraulic coupler is provided with a rotating speed sensor. By using the flexible supercharging system, the aims of outputting a large torque under a low working condition and protecting the rotating speed at a high working condition can be achieved, the efficiency of a complete machine can be increased, and the consumption of fuel oil under a full-working condition can be reduced.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a medium-high speed marine diesel engine. Background technique [0002] Exhaust gas turbocharging technology has become an essential technology for major manufacturers of diesel engines, and it has inherent defects as soon as it is produced. Since turbines and compressors belong to vane machines, there is only one optimal working speed or working state, that is, the design working point. However, diesel engines generally operate at multiple operating points (except for generator sets), which will inevitably cause the supercharging system to operate at non-operating points most of the time, resulting in a decrease in the efficiency of the turbocharger, thereby reducing the overall efficiency of the diesel engine. [0003] After years of hard work, scientific and technological workers have created many technologies to improve the matching shortcomings of the supercharging system, such as variabl...

AI Technical Summary

Problems solved by technology

However, the turbocharger is generally matched in the medium-high speed area, so under low working conditions, if a turbocharger is installed, it will have little impact on the intake air, but it also has a certain impact. The efficiency is extremely low, and the compressor blades are basically is hindering

For the turbine, the problem is even bigger, the resistance is particularly large, which hinders the exhaust, increases the exhaust back pressure, affects the combustion in the engine cylinder, and is not conducive to the work of the engine.

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