Engine Control Device Torque Compensation
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Solution Overview
Problem
Existing torque control methods for internal combustion engines with variable valve timing mechanisms struggle to accurately realize required torque without being influenced by the operation state of the valve timing, leading to excessive torque output due to incomplete consideration of valve timing effects on internal EGR and combustion efficiency.
Innovation Solution
A control device that calculates a target air quantity and ignition timing by considering the operation state of the variable valve timing, using data maps to determine optimal valve timing and adjust ignition timing to compensate for torque differences, ensuring precise torque control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve timing of the intake valve is advanced to improve combustion efficiency, then the internal EGR increases, but the torque becomes smaller than the maximum torque
Solution Approach 1:
The patent changes the ignition timing parameter to compensate for the torque reduction caused by advanced valve timing. By adjusting the ignition timing based on the actual valve timing position, the system maintains optimal combustion efficiency while compensating for the torque loss due to increased internal EGR.
Solution Approach 2:
The patent implements a feedback mechanism where the actual valve timing position is detected and used to determine the appropriate ignition timing correction. The control unit continuously monitors the valve timing and adjusts the ignition timing accordingly to maintain the required torque output despite variations in valve timing position.
2Productivity
If the valve timing of the intake valve is advanced, then the combustion center is delayed, but the maximum value of the cylinder pressure is reduced
Solution Approach 1:
The patent adjusts the ignition timing parameter in response to advanced valve timing to compensate for the delayed combustion center. By advancing the ignition timing when valve timing is advanced, the system maintains the maximum cylinder pressure at the appropriate point in the combustion cycle, preventing pressure reduction despite the combustion center delay.
3Force
If the ignition timing is corrected by being advanced to compensate for valve timing advance, then the required torque can be realized, but the maximum value of the cylinder pressure exceeds the sufficient level
Solution Approach 1:
The patent optimizes the ignition timing correction amount based on the actual valve timing position. Rather than applying a fixed correction, the system adjusts the ignition timing by a calculated amount that compensates for torque loss while preventing excessive cylinder pressure. This involves determining an appropriate correction value that balances torque requirements with pressure management.
4Ease of operation
If the throttle and ignition device are controlled without considering the valve timing state, then the control process is simple, but the required torque cannot be accurately realized
Solution Approach 1:
The patent incorporates feedback from the valve timing position sensor into the control process. The control unit receives the actual valve timing information and uses it to determine the appropriate ignition timing correction. This feedback mechanism enables accurate torque control while maintaining a relatively simple control structure by using the valve timing data to adjust ignition timing based on pre-stored correction maps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise torque control by accounting for variable valve timing effects, ensuring the required torque is achieved without being influenced by the operation state of the valve timing, thereby improving combustion efficiency and reducing excessive torque output.
Implementation Method 1
the valve timing of the intake valve affects an internal EGR, and the internal EGR has an influence on the torque of the internal combustion engine
Implementation Method 2
a spark ignition type internal combustion engine that has a variable valve timing mechanism
Data Source
AI summary
The present invention has an object to enable a torque as required to be realized without being influenced by an operation state of an IN-VVT, which is a variable valve timing mechanism which changes a valve timing of an intake valve. For this purpose, a control device for an internal combustion engine provided by the present invention stores data that defines a relationship between an air quantity and a torque in an MBT in association with the operation state of the IN-VVT, and calculates a target air quantity for realizing a required torque based on the data. The control device calculates an actual air quantity which is actually realized by an operation of a throttle when operating the throttle to realize the target air quantity. Further, the control device for an internal combustion engine provided by the present invention stores data that defines a relationship of the air quantity and an ignition timing in a case in which the IN-VVT is in a maximum retardation position, and calculates a basic ignition timing from the actual air quantity based on the data. Further, the control device for an internal combustion engine provided by the present invention determines an advance correction amount of the ignition timing from the operation state of the IN-VVT. The control device determines a final ignition timing from the basic ignition timing and the advance correction amount.