A balance valve control system and control method of an asymmetric turbocharger

Abstract

The invention relates to a balance valve control system and control method of an asymmetric turbocharger; the control system includes a balance valve control valve, an engine control unit, a supercharger balance valve control diaphragm valve, a balance valve plate, a booster Control method: 1. The engine control unit collects the actual boost pressure and EGR rate; 2. Compare with the target boost pressure and EGR rate to determine whether adjustment is required; 3. Determine the target outlet air pressure of the balance valve control valve; 4. 1. Determine the duty cycle and adjust the outlet air pressure; 5. The actual outlet air pressure acts on the booster balance valve to control the diaphragm valve; 6. The movement of the valve core changes the opening of the balance valve plate, causing the output power of the turbocharger turbine , the change of the pressure before the vortex; 7. Change the amount of work done by the compressor to the air and change the supercharging pressure; 8. Change the EGR rate of the engine; the present invention reduces the pressure before the vortex and the exhaust loss of the engine at medium and high speeds, and improves the economic performance of the engine and environmental performance.

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...

AI Technical Summary

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 energy loss and reducing the thermal efficiency of the engine.

[0005] There are few patents on the balance valve in the asymmetric supercharger, and most of them are structural innovations, and there are few patents on the control system and control method

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