Balance valve control system and control method of asymmetric turbocharger

Abstract

The invention relates to a balance valve control system and a control method of an asymmetric turbocharger. The control system comprises a balance valve control valve, an engine control unit, a supercharger balance valve control diaphragm valve, a balance valve plate and a supercharger turbine. The control method comprises the steps that of 1, collecting actual supercharging pressure and EGR rateby the engine control unit; 2, comparing with target supercharging pressure and EGR rate, and determining whether adjustment is needed or not; 3, determining the target outlet air pressure of the balance valve control valve; 4, determining a duty ratio, and performing outlet air pressure adjustment; 5, enabling the actual outlet air pressure to be acted on a supercharger balance valve control diaphragm valve; 6, moving a valve element to change the opening degree of the valve plate of the balance valve, thereby causing the change of the output work and the pre-vortex pressure of the supercharger turbine; 7, changing the acting amount of the air compressor on air, and changing the supercharge pressure; and 8, changing the EGR rate of the engine. The control system and control method disclosed by the invention can reduce the pre-vortex pressure and the engine exhaust loss at medium and high rotating speed, and the economic performance and the environment-friendly performance of the engine are improved.

Description

technical field [0001] The invention belongs to the technical field of exhaust systems of internal combustion engines, is an exhaust control system of internal combustion engines, and relates to a balance valve control system and a control method of an asymmetric turbocharger. Background technique [0002] In order to meet the requirements of continuously upgrading emission regulations, the NOx emission of internal combustion engines needs to be continuously reduced. In order to meet this requirement, exhaust gas is often introduced into the engine intake manifold before the inlet of the turbine, referred to as exhaust gas recirculation (EGR) technology. This requires that the gas pressure before the turbine inlet is relatively high, especially at low engine speed conditions, so as to establish a sufficient pressure difference between the two ends of the EGR circuit to ensure sufficient EGR flow. This requires the use of smaller turbines, increased turbo pre-pressure, and t...

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Problems solved by technology

The disadvantage of this method is that the supercharging pressure meets the working conditions of the engine through the waste gas bypass method, but at the same time part of the high-temperature and high-pressure gas is released, resulting in energ

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