Apparatus and method for manufacturing fuel injection control systems

Abstract

A method is provided to manufacture a fuel injection control system controlling fuel injection in an internal combustion engine with a fuel injection valve. A fuel injection valve is trial-manufactured. Using this valve, correcting amounts for an injection period are calculated at plural adjustment points defined by fuel pressures and injection periods. The adjustment points are divided into actual-measuring points and predicting points, and the correcting amounts at the actual-measuring points are used to calculate predicting expressions to predict correcting amounts at the predicting points and relational expressions to define a relationship among the correcting amounts at the actual-measuring points. When the valve is mass-manufactured, for each mass-manufactured valve, the correcting amounts at the actual-measuring points and the predicting expressions are used to predict correcting amounts at the predicting points, providing the correcting amounts at the actual-measuring and correcting points. Appropriateness of the predicting expressions is also estimated.

Description

[0001] This application claims priority from Japanese Patent Application No. 2005-261614 filed on September 9, 2005 and Japanese Patent Application No. 2006-149974 filed on May 30, 2006, which are incorporated herein by reference. technical field [0002] The invention relates to a method of manufacturing a fuel injection control system for controlling fuel injection in an internal combustion engine. Background technique [0003] Fuel injection control systems are known which are provided with a common rail acting as a common pressure accumulator to supply high pressure fuel into the fuel injection valves of the corresponding cylinders of a diesel engine. In such a common rail type fuel injection controller for a diesel engine, the injection period necessary for operating the fuel injection valve is set according to the required amount of fuel and the fuel pressure in the common rail (continuous injection in each injection period) . [0004] The injection characteristics ha...

AI Technical Summary

Problems solved by technology

This complicates the tuning process for fuel injection control, which cannot be ignored

[0007] In addition, the aforementioned disadvantages are not limited to fuel injection control systems for diesel engines

That is, even in the case of a fuel injection control system controlling fuel injection in an internal combustion engine, the adjustment process of the fuel injection control is complicated to a greater or lesser extent

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