Engine Knocking Control Ignition Timing Recovery
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Solution Overview
Problem
Existing engine knocking control methods fail to effectively recover retarded ignition timing when engine operating conditions change, leading to excessive ignition delay and decreased engine torque and fuel efficiency.
Innovation Solution
A method that accumulates driving time under specific engine operating conditions to recover retarded ignition timing, using learned values to adjust ignition timing based on average values from different conditions, and applies varying subtraction rates to advance or retard ignition timing across all engine operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine runs for a predetermined time under the same operating condition to recover retarded timing, then the knocking control is effective, but it is difficult to maintain the same operating condition in actual driving when driving situation or environment changes
Solution Approach 1:
The patent makes the recovery condition dynamic by allowing the engine to recover retarded timing based on accumulated driving time across multiple operating conditions, rather than requiring a fixed predetermined time under the exact same condition. This enables the system to adapt to varying driving situations while maintaining reliable knock control.
Solution Approach 2:
The patent changes the parameter for timing recovery from a fixed time threshold to an accumulated driving time threshold that can be met under different operating conditions. This parameter change allows the system to function reliably across diverse driving scenarios.
2Reliability
If the ignition timing is repeatedly adjusted whenever knocking occurs, then the knock control is applied, but it is impossible to automatically prevent the occurrence of knocking
Solution Approach 1:
The patent applies preliminary action by using learned retarded timing values to proactively adjust ignition timing before knocking occurs. The system learns from past knocking events and automatically applies corrective timing adjustments, preventing future knocking without requiring repeated reactive adjustments.
Solution Approach 2:
The patent implements feedback by using the learned retarded timing amount from detected knocking events to automatically adjust ignition timing. This closed-loop feedback mechanism enables automatic prevention of knocking by continuously learning from and responding to engine conditions.
3Reliability
If the retarded timing amount is not recovered during engine running, then the knock control is maintained, but an excessive delay of ignition time occurs, decreasing engine torque and deteriorating fuel efficiency
Solution Approach 1:
The patent applies partial action by recovering retarded timing based on accumulated driving time rather than requiring complete recovery under strict conditions. This allows the system to maintain adequate knock control while avoiding excessive timing delay that would harm engine performance and fuel efficiency.
Data Source
AI summary
A method for controlling engine knocking, in which a retarded timing is recovered based on a retarded timing amount learned when the engine knocking occurs during driving of a vehicle, includes a first process of retarding an ignition timing based on the previously learned retarded timing amount in a reference engine operating condition entered during driving of the vehicle. A second process recovers the retarded timing when a first condition in which a time duration acquired by accumulating a driving time under the reference engine operating condition is equal to or more than a reference time duration and a second condition in which the engine knocking does not occur while driving under the reference engine operating condition are satisfied.