Control method and device for two-stage supercharged engine

Abstract

The invention discloses a control method for a two-stage supercharged engine. The control method is suitable for controlling the engine provided with an electric supercharger and a turbosuperchager; the control method comprises the steps that when a vehicle quickly accelerates, whether starting conditions of the electric supercharger are met or not is judged, and the starting conditions comprise that the rotating speed of the engine is smaller than a start-up rotary speed threshold value, the vehicle speed of a vehicle is smaller than a start-up vehicle speed threshold value, the remaining electricity of a battery of the vehicle is larger than a start-up electricity threshold value, the temperature of a cooling system of the electric supercharger is smaller than a starting system temperature threshold value, the environment temperature is smaller than a start-up environment temperature threshold value, and a driving pattern supports the electric supercharging function; if the vehicle meets the starting conditions, the electric supercharger and the turbosuperchager are controlled to supercharge the engine; and if the vehicle does not meet the starting conditions, the turbosuperchager is controlled to supercharge the engine. By means of the control method, the electric supercharger is determined to be started according to the vehicle running state, and the vehicle is protected.

Description

technical field [0001] The invention relates to the technical field of engine supercharging, in particular to a control method and device for a two-stage supercharging engine. Background technique [0002] An engine is a machine that can convert other forms of energy into mechanical energy. The performance of the engine depends to a large extent on the intake system of the engine. The intake system of the engine is used to supply sufficient fresh air to the engine to meet the needs of engine combustion. At present, the air intake system of the engine usually adopts the compound supercharging form of the electric supercharger and the turbocharger to provide sufficient fresh air for the engine, and the engine with this kind of air intake system is a two-stage supercharged engine. This two-stage supercharging form can effectively make up for the defect that the intake system of the engine cannot provide a higher intake pressure when the engine speed is low at the beginning. ...

AI Technical Summary

Problems solved by technology

[0005] The existing control method only controls the switch of the electric supercharger through the change rate of the pedal opening when controlling the electric supercharger. Since there is no comprehensive judgment on the vehicle running state, when the vehicle running state is not suitable for using the electric When the electric supercharger is still activated, it will damage the vehicle

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