Engine Control Device Torque Fluctuation Correction
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Solution Overview
Problem
Internal combustion engines experience torque fluctuations and response delays when switching between stoichiometric and lean combustion states, leading to inefficiencies and catalyst performance issues during transitions.
Innovation Solution
A control device and method for internal combustion engines that acquires required torque and operating states, determining target air-fuel ratios for both air and injection systems to perform torque fluctuation correction, thereby reducing the difference between required and actual torque, and adjusting ignition timing to maintain optimal engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the combustion state is switched between stoichiometric combustion and lean combustion, then fuel efficiency is improved, but torque fluctuation occurs
Solution Approach 1:
The control device performs preliminary action by determining a target air-fuel ratio in advance before the combustion state transition occurs. By predicting the required air-fuel ratio based on the current state and transition requirements, the system prepares the injection system ahead of time, preventing torque fluctuations during the actual transition between stoichiometric and lean combustion modes.
Solution Approach 2:
The control device uses feedback by determining the target air-fuel ratio based on the actual combustion state and adjusting the injection system accordingly. The system continuously monitors the combustion state and modifies the air-fuel ratio control in response to actual performance, enabling stable transition between combustion modes while maintaining fuel efficiency.
2Speed
If the target air-fuel ratio is changed rapidly to improve response, then responsiveness is improved, but response delay occurs due to air amount change lag
Solution Approach 1:
The control device determines the target air-fuel ratio in advance based on the required torque and current combustion state, before the actual air amount change can occur. This preliminary determination allows the injection system to be prepared ahead of time, compensating for the inherent delay in air amount response and improving overall system responsiveness.
Solution Approach 2:
The control device dynamically adjusts the target air-fuel ratio based on the transition state between combustion modes. By making the air-fuel ratio control adaptive and dynamic rather than fixed, the system can optimize responsiveness while accounting for the varying response characteristics of the air amount during different operating conditions.
3Stability of the object's composition
If torque fluctuation correction is performed during transition period, then torque stability is improved, but control complexity increases
Solution Approach 1:
The control device applies local quality by performing torque fluctuation correction specifically during the transition period between combustion states, rather than continuously. By identifying the specific transition window and applying correction only when needed, the system maintains torque stability without requiring complex continuous control mechanisms throughout all operating conditions.
Solution Approach 2:
The control device uses parameter changes by adjusting the target air-fuel ratio as the key parameter during transition periods. By focusing control efforts on modifying this single critical parameter rather than multiple parameters simultaneously, the system achieves torque stability during transitions while keeping the overall control strategy relatively simple and manageable.
Data Source
AI summary
An acquisition unit acquires a required torque and an operating state of an internal combustion engine. A control unit is configured to: control operation of the internal combustion engine by using a required air amount, a required fuel amount, and a required ignition timing; acquire a required air amount by using the acquired required torque and a target air-fuel ratio of an air system determined according to the operating state; perform torque fluctuation correction on the target air-fuel ratio of the air system to determine a target air-fuel ratio of an injection system to reduce a difference between the required torque and an actual torque in a transition period between stoichiometric combustion and lean combustion; acquire a required fuel amount and a required ignition timing by using the determined target air-fuel ratio of the air system and the determined target air-fuel ratio of the injection system.