Method for detecting and compensating for injector variability in a direct injection system

By increasing fuel pump pressure and performing multiple injector calibrations during low load conditions, the method addresses injector variability, ensuring precise calibration and improved engine performance and reduced emissions.

DE102008064912B4Active Publication Date: 2026-03-19FORD GLOBAL TECH LLC
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Patent Information

Application Number
DE102008064912
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2007-05-07
Filing Date
2008-04-08
Publication Date
2026-03-19
Estimated Expiration
2028-04-08

AI Technical Summary

Technical Problem

Fuel injectors in direct injection engine systems exhibit variability due to manufacturing flaws and aging, leading to inconsistent cylinder torque output, higher tailpipe emissions, and reduced fuel economy, which existing calibration methods fail to adequately address.

Method used

A method involving increased fuel pump operation to raise pressure beyond normal levels, followed by a reduction, allowing for precise injector calibration during low engine load conditions, with multiple injections per injector to compensate for variability and reduce temperature sensitivity.

Benefits of technology

This approach ensures sufficient manifold pressure drop for accurate calibration, minimizing torque imbalance and improving fuel metering precision, thereby enhancing engine performance and reducing emissions.

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Abstract

Method for controlling fuel injection of a direct injection fuel system, wherein the direct injection fuel system comprises a fuel pump (202, 206) and several fuel injectors (214a, 214b, 214c, 214d), the method comprising: Variable operation of the fuel pump (202, 206) to maintain a fuel pressure at a selected pressure; Temporarily increasing the pump operation to raise the pressure sufficiently above the selected pressure, and then reducing the pump operation; During at least one fuel injection following the reduction of pump operation: Correlation of the fuel pressure drop during the at least one fuel injection with a fuel injector operation, wherein a predetermined number of fuel injections for each fuel injector (214a, 214b, 214c, 214d) in an engine (10) is performed following and near the reduction of pump operation, and Adjusting the fuel injector operation based on correlation.
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