Fuel Injection Control Device for Engine Start-Up
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Solution Overview
Problem
Existing engine fuel injection systems struggle to precisely determine the fuel injection amount during start-up operations due to variations in fuel remaining in the air intake passage, which depend on engine temperature, time elapsed since last stop, and whether the last stop was intended or unintended, leading to inefficient start-up performance.
Innovation Solution
A fuel injection control device that acquires and stores engine stop information, including whether the stop was intended or unintended, and uses this information to determine the fuel injection amount during start-up, considering factors like engine temperature and rotational speed to adjust the injection amount accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the start-up fuel injection amount is increased to ensure sufficient fuel reaches the cylinder, then the engine can start more reliably, but excess fuel adheres to the air intake passage wall surface causing waste and potential harm
Solution Approach 1:
The patent applies dynamics by making the start-up fuel injection amount variable rather than fixed. The ECU dynamically adjusts the injection amount based on detected engine stop conditions (intended vs. unintended stops) and elapsed time, optimizing the balance between ensuring sufficient fuel reaches the cylinder for reliable starting and minimizing fuel waste through reduced adherence to air intake passage surfaces
Solution Approach 2:
The patent changes the parameter of fuel injection amount based on different operating conditions. By detecting whether the engine stop was intended or unintended and measuring the elapsed time, the system adjusts the start-up fuel injection amount parameter to achieve optimal start-up reliability while minimizing fuel waste and adherence to passage walls
2Device complexity
If a fixed start-up fuel injection amount is used regardless of stop conditions, then the control system is simple, but the fuel injection amount is imprecise leading to either insufficient fuel or excessive fuel waste
Solution Approach 1:
The patent applies preliminary action by detecting and recording engine stop conditions (intended or unintended) and elapsed time before the engine starts up. This advance information gathering allows the ECU to precisely calculate and set the appropriate start-up fuel injection amount before fuel injection begins, avoiding both insufficient and excessive fuel delivery
Solution Approach 2:
The patent implements feedback by using the ECU to continuously monitor engine operating conditions, detect stop conditions, measure elapsed time, and adjust the start-up fuel injection amount accordingly. This closed-loop control provides precise fuel injection amount control while maintaining reasonable system complexity through integrated sensing and control
Data Source
AI summary
Provided is a fuel injection control device that makes it possible to precisely estimate an amount of fuel remaining in an air intake passage at a start-up of an engine, and to precisely set an fuel injection amount during start-up operation. In the fuel injection control device of the present invention, in a process in which the engine is transferred from operation state to a stop state, engine stop information is acquired and stored in a nonvolatile memory, the engine stop information including, at least an information indicating whether the current engine stop is an intended stop accompanied by fuel cutting. During the start-up of the engine, judgement is made as to whether the last engine stop was the intended stop or not, based upon the engine stop information and a fuel injection amount during start-up operation is determined with reference to the result of the judgement.