Method for calculating engine charge efficiency for continuously variable valve timing phaser

CN117329006BActive Publication Date: 2026-06-19DELPHI SHANGHAI DYNAMICS AND PROPULSION SYSTEMS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DELPHI SHANGHAI DYNAMICS AND PROPULSION SYSTEMS CO LTD
Filing Date
2023-09-11
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately calculate the fresh air volume of continuously variable valve timing (CVT) engines, leading to increased fuel consumption, worsened CO and THC emissions, or increased NOx emissions, and may even cause engine misfires.

Method used

By acquiring the VVT ​​phase angle detection values ​​during intake and exhaust, matching them with pre-divided discrete values, and using the load-coefficient mapping relationship and fitting coefficients to calculate the engine charging efficiency, combined with linear interpolation methods, the calculation accuracy is improved.

Benefits of technology

It achieves highly accurate calculation of engine charging efficiency, reduces fuel consumption and original engine emissions, and avoids engine failure.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to a method for calculating engine charging efficiency using a continuously variable valve timing (VVT) system. The method includes: acquiring the VVT ​​phase angle detection value during intake and matching it with pre-defined discrete VVT ​​phase angle values ​​during intake; acquiring engine load information, and based on the engine load information and the discrete VVT ​​phase angle values ​​during intake, matching a fitting coefficient for calculating engine charging efficiency using a pre-constructed load-coefficient mapping relationship, wherein the engine load information includes at least one engine load index; acquiring the VVT ​​phase angle detection value during exhaust, and calculating the engine charging efficiency based on the fitting coefficient and the exhaust VVT phase angle detection value. Compared with existing technologies, this invention achieves accurate calculation of the actual intake volume under different VVT phase angles, thereby achieving accurate actual fuel injection volume and reducing fuel consumption and engine emissions.
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