Pressurization method and system for engine

Abstract

The invention discloses a pressurization method and system for an engine. The method includes the steps of obtaining the target pressurization pressure and the actual pressurization pressure in front of a throttle valve of the engine; closing a bypass valve of an electronic turbocharger and measuring the inlet pressure of the electronic turbocharger when the difference value between the target pressurization pressure and the actual pressurization pressure in front of the throttle valve of the engine is greater than the preset pressure difference threshold value; according to the inlet pressure and the target pressurization pressure of the electronic turbocharger, obtaining the target pressurization ratio of the electronic turbocharger; according to the target pressurization ratio of the electronic turbocharger and a pre-stored corresponding relation table of the pressurization ratio and the rotation speed of the electronic turbocharger, determining the target rotation speed of the electronic turbocharger; and according to the target rotation speed, controlling the electronic turbocharger to pressurize the engine. According to the pressurization method and system, when the actual pressurization pressure cannot reach a target value fast, the electronic turbocharger can pressurize the engine, and therefore the power acceleration performance of vehicles can be improved, and turbine lag can be reduced.

Description

technical field [0001] The invention relates to the technical field of engine supercharging, in particular to an engine supercharging method and system. Background technique [0002] Under the trend of engine miniaturization, in order to improve the power performance and economic performance of the engine, the engine needs to be equipped with a supercharger with high boost pressure. For a traditional supercharger, as the boost pressure increases, the moment of inertia of the turbine and compressor becomes larger, the phenomenon of turbo hysteresis becomes more serious, and the low-speed torque performance and acceleration performance of the engine deteriorate. [0003] In order to take into account the highest boost pressure and low-speed torque performance of the engine, a supercharger composed of a supercharger and an exhaust gas turbocharger has appeared. However, the supercharging process of the supercharging system is complicated, there is a certain degree of turbo lag...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide an engine supercharging method and system for the traditional engine supercharging system, which has a certain degree of turbo hysteresis phenomenon and the power performance is not outstanding.

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