Engine Fuel Injection Control During Upshift
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Solution Overview
Problem
Existing control systems for internal combustion engines during upshift transmission often result in excessive fuel injection, leading to reduced fuel efficiency and emission quality due to improper torque-down control strategies.
Innovation Solution
A control apparatus that includes a fuel-cut torque-down control unit, a requested injection amount parameter acquiring unit, and a minimum injectable amount parameter acquiring unit, which dynamically adjust fuel injection based on operation state parameters to ensure the fuel injection unit stops injecting fuel when the minimum injectable amount exceeds the requested injection amount during upshift transmission, thereby preventing excessive fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fuel-cut torque-down control is performed during upshift transmission, then torque generated by the internal combustion engine is reduced, but excessive fuel injection occurs leading to reduced fuel efficiency and emission quality
Solution Approach 1:
The control apparatus uses feedback control by continuously monitoring the relationship between minimum injectable amount and requested injection amount, and adjusting fuel injection accordingly. The ECU determines whether to stop or continue fuel injection based on real-time comparison of these parameters, ensuring precise control to prevent both excessive fuel injection and insufficient torque reduction during upshift transmission.
Solution Approach 2:
The system dynamically changes the fuel injection parameter (injection amount) based on operating conditions. By comparing the minimum injectable amount parameter with the requested injection amount parameter, the system adjusts the fuel injection state between stopping and continuing injection, optimizing both torque control and fuel efficiency across different operating conditions.
2Power
If fuel-cut torque-down control is performed during upshift transmission, then torque generated by the internal combustion engine is reduced, but emission quality deteriorates due to improper fuel injection control
Solution Approach 1:
The control system implements feedback control by continuously monitoring injection parameters and adjusting fuel injection based on the comparison between minimum injectable amount and requested injection amount. This ensures that fuel injection is precisely controlled to maintain emission quality while achieving torque reduction during upshift transmission.
Solution Approach 2:
The system applies partial fuel injection control rather than complete fuel cut. By injecting a controlled minimum amount of fuel (when minimum injectable amount exceeds requested injection amount), the system prevents harmful emissions that would result from complete fuel cut, while still achieving sufficient torque reduction for smooth upshift transmission.
3Power
If the fuel injection unit stops injecting fuel during upshift transmission, then torque is reduced for smooth shifting, but control accuracy decreases leading to improper fuel injection after upshift
Solution Approach 1:
The control apparatus employs feedback control by continuously monitoring operating state parameters and comparing minimum injectable amount with requested injection amount. This feedback mechanism ensures that fuel injection is restarted at the appropriate time after upshift transmission, maintaining high control accuracy and preventing improper fuel injection while achieving smooth torque reduction during the shift.
Data Source
AI summary
A control apparatus for an internal combustion engine includes circuitry configured to control a fuel injector of the internal combustion engine to stop injecting fuel to reduce torque generated by the internal combustion engine during upshift. The circuitry is to acquire a target injection amount parameter corresponding to a target injection amount of the fuel to be injected by the fuel injector to operate the internal combustion engine based on an operation state parameter corresponding to an operation state of the internal combustion engine. The circuitry is to acquire a minimum injectable amount parameter corresponding to a minimum injectable amount of the fuel injectable from the fuel injector. The circuitry is to control the fuel injector to start injecting the fuel when the minimum injectable amount parameter exceeds the target injection amount parameter while the fuel injector is controlled to stop injecting the fuel during the upshift.