Engine Fuel Injection Control Device Maintaining Air/Fuel Ratio
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Solution Overview
Problem
In multi-stage injection control for internal combustion engines, the division ratio for fuel injection cannot be accurately maintained, leading to inaccuracies in achieving the desired air/fuel ratio, especially when the engine operation state changes and fuel injection is performed multiple times.
Innovation Solution
A control device with a calculation unit for determining fuel injection rates, a storage unit for storing these rates, and a control unit for managing fuel injection valves to ensure consistent fuel injection based on calculated rates, allowing for precise air/fuel ratio control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-stage injection control is implemented to optimize combustion demand, then combustion efficiency is improved, but the division ratio and total injection amount cannot be kept when operation state changes, leading to inaccurate air/fuel ratio control
Solution Approach 1:
The invention stores the division ratio and total injection amount calculated at the timing of injection command output before the actual injection occurs. This preliminary storage ensures that these parameters are fixed and available for accurate control during the subsequent injection process, preventing changes that would otherwise occur due to operation state variations.
Solution Approach 2:
The invention creates a copy of the division ratio and total injection amount parameters by storing them in memory at the timing of injection command output. This stored copy is then used for controlling the actual fuel injection, ensuring that the control parameters remain consistent and accurate even when operation states change during the injection process.
2Stability of the object's composition
If fuel injection pulse width is corrected by fuel pressure to maintain consistent fuel injection amount, then injection consistency is improved, but it becomes impossible to accurately control desired air/fuel ratio when multiple injections are performed
Solution Approach 1:
The invention stores the division ratio and total injection amount at the timing of injection command output, before fuel pressure corrections are applied. This ensures that the original control parameters are preserved and can be used to accurately control the air/fuel ratio across multiple injections, rather than being altered by real-time pressure variations.
Solution Approach 2:
The invention introduces a storage unit (memory) as an intermediary between the calculation of injection parameters and the actual fuel injection process. This intermediary stores the division ratio and total injection amount, allowing them to be referenced consistently for multiple injections without being directly affected by changing fuel pressure conditions.
Data Source
AI summary
In control device of an internal combustion engine, for each first period, a calculation unit calculates number of fuel injections within one combustion cycle and fuel injection rate. For first period, a first storage unit stores number of fuel injections and fuel injection rate of calculation unit. For each second period, a reference unit refers to the number of fuel injections and fuel injection rate stored by the first storage unit. A second storage unit stores for an interval, from the start time of the first fuel injection until start of the last fuel injection of at least one combustion cycle, the number of fuel injections and fuel injection rate referred to by reference unit. A control unit controls a fuel injection valve so that fuel is injected in accordance with the number of fuel injections fuel injection rate stored by second storage unit.