A Method for Improving VVT Engine Exhaust Emission

Abstract

The present invention is applicable to the technical field of automobile emission reduction, and provides a method for improving VVT engine exhaust emission, which includes the following steps: in the cold engine start-up stage, an engine oil pressure sensor monitors the engine oil pressure of the VVT ​​system in real time, and the detected engine oil pressure is activated To the engine control unit; the engine control unit detects that the current oil pressure reaches the set pressure value, then adjusts the valve angle and exhaust valve angle of the VVT ​​system to the corresponding position of the calibrated VVT angle combination. In the cold start stage, when the oil pressure sensor detects that the oil pressure in the VVT ​​system reaches the set standard, the intake valve angle and exhaust valve angle of the VVT ​​system are controlled to be at the corresponding position of the best VVT angle combination. On the one hand, it can Realize starting the VVT ​​system at the start-up stage of the cold engine to reduce the tail row; on the other hand, make the intake valve angle and exhaust valve angle of the VVT ​​system at the corresponding position of the best VVT angle combination, so as to further reduce the tail row of the engine .

Description

technical field [0001] The invention belongs to the technical field of automobile emission reduction and provides a method for improving exhaust emission of a VVT engine. Background technique [0002] With the increasingly serious domestic and global environmental pollution, automobile emission regulations are becoming increasingly stringent, and higher requirements are placed on the exhaust emission level of the vehicle. However, the catalytic converter of the automobile needs to reach a certain temperature (generally 350°C) to have Higher conversion efficiency. In the cold engine starting stage, due to the low temperature of the catalytic converter, the conversion efficiency is basically zero. It can only rely on the technical upgrade of the engine itself and the reasonable control of fuel injection and ignition by the engine control unit (hereinafter referred to as ECU). , to reduce the original engine emissions. [0003] Most of the existing VVT systems start when the w...

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Problems solved by technology

[0004] The embodiment of the present invention provides a method for improving exhaust emissions of VVT engines, aiming to solve the problem that existing VVT systems cannot reduce exhaust emissions during the cold start-up phase

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