Engine Control Actuator Command Limiting for Simultaneous Target Achievement
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Solution Overview
Problem
Existing engine control systems face challenges in efficiently bringing multiple engine output-related values into agreement with target values simultaneously, particularly due to interference between controlled variables and the need for extensive adaptability tests to create control maps, which burdens manufacturers and limits controllability when actuators operate within allowable ranges.
Innovation Solution
An engine control apparatus that calculates target combustion parameters based on engine output-related values using arithmetic expressions, adjusts actuator command values to achieve desired combustion conditions, and includes feedback mechanisms to correct deviations and limit values within actuator operational ranges, thereby reducing the need for extensive adaptability testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If control maps are created through extensive adaptability tests for each environmental condition, then the precision of engine output-related values is improved, but the time and cost burden on manufacturers increases significantly
Solution Approach 1:
The patent implements feedback control by continuously monitoring actual engine output-related values and comparing them with target values, then automatically adjusting controlled variables to eliminate deviations. This replaces the need for extensive pre-testing with real-time adaptive control, reducing manufacturer burden while maintaining precision.
Solution Approach 2:
The control system dynamically adjusts controlled variables based on current operating conditions and deviations from target values, rather than relying on static pre-determined maps. This dynamic adaptation eliminates the need for extensive adaptability tests for each environmental condition.
2Device complexity
If multiple controlled variables are adjusted independently to meet target values, then the complexity of control is reduced, but interference between variables prevents simultaneous achievement of all target values
Solution Approach 1:
The patent merges the control of multiple controlled variables into a unified feedback control system that simultaneously considers all variables and their interrelationships. By calculating comprehensive deviations and adjusting all variables coordinatedly, the system achieves all target values simultaneously without the interference problems of independent control.
3Speed
If command values are output without considering actuator operation ranges, then the responsiveness of the control system is improved, but the actuators cannot achieve the commanded values when outside allowable ranges
Solution Approach 1:
The control system performs preliminary validation of command values against actuator operation ranges before output. By checking and adjusting command values in advance to ensure they fall within allowable ranges, the system maintains responsiveness while guaranteeing that actuators can achieve the commanded values.
Data Source
AI summary
An engine control apparatus which may be employed in automotive vehicles. The engine control apparatus is equipped with a controlled variable arithmetic expression which defines correlations between a plurality of combustion parameters and a plurality of controlled variables of actuators for control of an operation of the engine to calculate a combination of command values to be outputted to the actuators for regulating the controlled variables needed to achieve target values of the combustion parameters. When one of the command values is produced outside an allowable operation range of a corresponding one of the actuators, the engine control apparatus corrects or limits the one of the command values to an upper or a lower limit of the allowable operation range, thereby ensuring the stability in bringing engine output characteristics close to desired values.