Supercharging system for engine and control method

Abstract

The invention belongs to the technical field of engine supercharging, and relates to a supercharging system for an engine and a control method. The supercharging system comprises an electronic supercharger gas compressor, an electronic supercharger performer, a gas inlet bypass valve, and a gas inlet bypass valve performer, wherein a blade of the electronic supercharger gas compressor is coaxiallyconnected with a motor in the electronic supercharger performer; the gas inlet bypass valve performer is used for controlling valve opening of the gas inlet bypass valve; the electronic superchargergas compressor is in parallel connected with the gas inlet bypass valve and then is accessed to the front of a waste gas turbine supercharger; the electronic supercharger performer communicates with the gas inlet bypass valve performer through CAN, and the electronic supercharger performer and the gas inlet bypass valve performer are controlled by an engine control unit ECU. The control method comprises an external characteristic torque lift mode and transient-state acceleration response lift mode control method. Medication on the original engine is relatively small, so that external characteristic torque lifting of the original engine can be realized, oil consumption is reduced, and an engine matching range is expanded; and the problems that the waste gas turbine supercharger has delay and is poor in acceleration response are solved, so that driving comfort is improved.

Description

technical field [0001] The invention belongs to the technical field of engine boosting, and relates to an engine boosting system and a control method. Background technique [0002] Existing engine supercharging systems are mainly single-stage exhaust gas turbocharging. As fuel consumption and emission regulations continue to tighten, and drivers have higher and higher requirements for vehicle driving comfort, the requirements for engine supercharging technology are also getting higher and higher. The traditional single-stage exhaust gas turbocharger can increase the intake air volume to a certain extent and increase the power performance. However, due to the limitations of the mechanical structure and insufficient low-speed exhaust gas energy, the unipolar exhaust gas turbocharger has the problems of turbo hysteresis and poor transient response; and in the process of engine turbocharger selection and matching, both low-speed and high-speed A working condition, the efficien...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problems of turbo lag, poor transient response and limited supercharging pressure in the prior art, and provide a supercharging system and control method for an engine

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