Fuel Injection Cutoff Control for Engine Oscillation Attenuation
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Solution Overview
Problem
Existing methods for controlling internal combustion engines during deceleration phases fail to maintain nominal driving pleasure while significantly reducing fuel consumption, often resulting in prolonged filtering times that degrade driving experience and increase fuel consumption.
Innovation Solution
A method that detects vehicle deceleration, determines curative and preventive torques, and cuts off fuel injection when the curative torque reaches a value proportional to its maximum, allowing for earlier injection cutoff and reducing engine tilting, thereby minimizing rebounds and fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fuel injection is cut off early during deceleration to save fuel, then fuel consumption is reduced, but engine oscillations and rebounds increase degrading driving pleasure
Solution Approach 1:
The control method applies preliminary curative torque before injection cutoff to pre-attenuate engine oscillations. By generating corrective torque in phase opposition with the oscillation before injection is cut off, the system prepares the engine to minimize rebounds while enabling early injection cutoff for fuel savings.
Solution Approach 2:
The system continuously monitors engine speed to detect oscillations during deceleration and dynamically adjusts the curative torque in real-time. The curative torque is generated in phase opposition with the detected oscillations, creating a feedback control mechanism that actively suppresses engine rebounds while maintaining fuel efficiency.
2Ease of operation
If curative filtering is applied to attenuate engine speed oscillations, then driving pleasure is improved, but fuel consumption increases due to prolonged filtering time
Solution Approach 1:
The control method applies curative torque in advance before injection cutoff occurs. By pre-attenuating the engine oscillations during the deceleration phase, the system reduces the need for prolonged filtering after injection stops, thereby maintaining driving pleasure while minimizing additional fuel consumption.
Solution Approach 2:
The system dynamically adjusts the curative torque based on real-time engine speed oscillations detected during deceleration. The curative torque is modulated to match the oscillation characteristics, providing optimal attenuation efficiency that minimizes both filtering duration and fuel consumption while maintaining driving pleasure.
3Stability of the object's composition
If preventive torque filtering is extended to fully pass engine play, then engine tilting is minimized, but injection cutoff is delayed increasing fuel consumption
Solution Approach 1:
The control method applies preventive torque in advance during the deceleration phase to limit engine tilting before injection cutoff. By proactively stabilizing the engine on its wedges during deceleration, the system enables earlier injection cutoff without causing excessive rebounds, thus reducing fuel consumption while maintaining engine stability.
Data Source
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Figure 3~4d
AI summary
The invention relates to a method for interrupting the injection of fuel to an internal combustion engine in a vehicle during the deceleration phase, which comprises: a step of detecting a request to decelerate the vehicle, and a step of determining a corrective torque (Ccor) intended for attenuating engine speed oscillations during the deceleration, characterised in that it comprises: a step of detecting the first maximum corrective torque and, following the detection of said first maximum corrective torque, a step of requesting the interruption of the injection when the corrective torque (Ccor) reaches a value proportional to the first maximum corrective torque.