Supercharger control method and system

Abstract

The invention belongs to the technical field of engines, and particularly relates to a supercharger control method and system. The supercharger control method comprises the following steps of judgingwhether a vehicle is in a braking state or not, controlling a supercharger to adopt a first closed-loop control strategy according to the braking state of the vehicle, and controlling the superchargerto adopt a second closed-loop control strategy according to the condition that the vehicle is in the non-braking state. According to the supercharger control method, an open-loop control strategy adopted by the supercharger in the prior art is changed into a closed-loop control strategy, so that the opening degree of the supercharger can be changed along with the working condition of the vehicleto meet the braking requirement of the vehicle, and the braking capacity of the vehicle is improved.

Description

technical field

[0001] The invention belongs to the technical field of engines, and in particular relates to a supercharger control method and system. Background technique

[0002] This section provides background information related to the present disclosure only and is not necessarily prior art.

[0003] Now Euro-6 car engine products have the function of in-cylinder braking. When the accelerator is released, the exhaust valve opens instantly when the piston is near the upper pole during the compression stroke, releasing the high-pressure gas, and then closes the exhaust valve. There is very little gas in the cylinder, so when the piston moves from the upper pole to the lower during the explosion (expansion) stage, the cylinder is in a state of negative pressure, and the gas will prevent the piston from going down and generate a torque effect on the crankshaft in the opposite direction, thereby producing a braking effect , The supercharger adopts an electronically control...

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