Fuel Injection Control for Intake Stroke Acceleration
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Solution Overview
Problem
In internal combustion engines, the delayed calculation of fuel injection during acceleration leads to fuel being injected during the compression stroke, causing exhaust performance deterioration due to fuel adhesion and insufficient fuel injection during the intake stroke, which affects driving performance.
Innovation Solution
A device with an estimation unit that calculates the increase in air intake during acceleration, allowing the control unit to immediately adjust the fuel injection amount during the intake stroke, ensuring accurate fuel supply and preventing exhaust performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuel injection amount is calculated based on intake air amount measured at the start of intake stroke, then fuel injection control is simplified, but exhaust performance deteriorates when acceleration occurs during intake stroke
Solution Approach 1:
The estimation unit preliminarily estimates the increase in intake air amount during acceleration by detecting the increase in intake air amount after acceleration occurs, before the fuel injection amount needs to be corrected. This allows the control unit to proactively adjust fuel injection timing and amount to prevent exhaust performance deterioration.
Solution Approach 2:
The control unit uses feedback from the air flow meter to detect changes in intake air amount during acceleration. By continuously monitoring the intake air amount and comparing it with the estimated value, the system dynamically adjusts fuel injection parameters to maintain optimal exhaust performance under varying operating conditions.
2Quantity of substance
If fuel injection is delayed until end timing of intake stroke to account for increased air amount, then fuel shortage is corrected, but fuel is injected during compression stroke causing adhesion and exhaust performance deterioration
Solution Approach 1:
The estimation unit performs preliminary estimation of the intake air amount increase during acceleration at an appropriate timing before the compression stroke begins. This allows the control unit to calculate the required fuel injection amount in advance and execute injection during the intake stroke, avoiding delayed injection that would occur during compression.
Solution Approach 2:
The system dynamically adjusts the fuel injection timing based on real-time detection of acceleration conditions and intake air amount changes. When acceleration is detected, the control unit modifies injection timing from the fixed end-of-intake-stroke to an optimized timing that prevents compression stroke injection while ensuring sufficient fuel supply.
3Adaptability or versatility
If multistage injection control is implemented with multiple injection timings, then fuel injection flexibility is improved, but exhaust performance deteriorates when acceleration causes insufficient fuel injection during intake stroke
Solution Approach 1:
The control unit dynamically adjusts the multistage injection strategy based on acceleration detection. When acceleration occurs, the system modifies injection timing and amount for each stage to ensure sufficient total fuel injection during the intake stroke, preventing the exhaust performance deterioration that would occur with fixed multistage injection parameters.
Data Source
AI summary
Provided is a device for controlling a fuel injection device capable of suppressing deterioration of exhaust performance while ensuring driving performance when acceleration of a vehicle is requested during an intake stroke. Therefore, when the acceleration of a vehicle is requested during an intake stroke in one combustion cycle, an engine control unit 9 estimates an increase (acceleration intake air amount Qad) of the amount of air taken in a combustion chamber 19 of an internal combustion engine 1 associated with the acceleration of the vehicle after the acceleration of the vehicle is requested in one combustion cycle based on a lift amount of an intake valve 3. The engine control unit 9 controls a fuel injection valve 5 so as to increase a fuel injection amount in one combustion cycle according to the acceleration intake air amount Qad.