Engine Torque Modeling With Water Injection Compensation
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Solution Overview
Problem
Existing torque determination methods for internal combustion engines are unreliable and inaccurate, particularly when water injection systems are used, affecting smooth transmission shifting and overall engine performance.
Innovation Solution
A torque model that incorporates a corrective parameter, such as a torque offset value, based on the amount of water injected into the engine intake tract, is used to enhance torque determination accuracy, accounting for combustion delays caused by water injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If water injection is used to reduce emissions and fuel consumption, then environmental performance is improved, but torque determination accuracy deteriorates due to combustion delay effects
Solution Approach 1:
The patent applies parameter changes by modifying the torque model to include water injection amount as an additional input parameter. The control unit adjusts the torque calculation by applying a corrective parameter (torque offset value) based on the detected water injection amount, thereby maintaining torque determination accuracy despite the combustion delay effect caused by water injection.
Solution Approach 2:
The patent implements feedback by continuously detecting the water injection amount and using this information to dynamically adjust the torque determination. The control unit receives feedback from the water injection system and automatically compensates for the combustion delay effect by applying appropriate corrective values to the torque model, ensuring accurate torque determination under varying water injection conditions.
2Object-generated harmful factors
If water injection amount increases to further reduce emissions, then environmental performance is improved, but torque determination reliability deteriorates due to enhanced combustion delay effects
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing corrective parameters (torque offset values) in a map structure that corresponds to different water injection amounts. When water injection occurs, the control unit directly retrieves the appropriate corrective value from the pre-prepared map based on the current water injection amount, enabling reliable and rapid torque determination without complex real-time calculations.
Solution Approach 2:
The patent modifies the torque model parameters by incorporating water injection amount as an additional input variable. The control unit changes the torque calculation parameters dynamically based on the water injection amount, using a corrective parameter that is specifically tailored to compensate for combustion delay effects at each water injection level, thereby maintaining reliability across the full operating range.
3Measurement precision
If a corrective parameter is added to the torque model to account for water injection, then torque determination accuracy is improved, but device complexity increases
Solution Approach 1:
The patent reduces complexity by performing preliminary calculations and storing corrective parameters in advance. A map structure is pre-populated with torque offset values corresponding to different water injection amounts, allowing the control unit to simply retrieve and apply the appropriate value during operation without performing complex real-time computations, thus maintaining system simplicity.
Solution Approach 2:
The patent manages complexity by systematically organizing the corrective parameters as a function of water injection amount. The torque model is extended to include water injection amount as an input parameter with corresponding corrective output, creating a structured parameter relationship that is easy to implement and maintain while improving accuracy.
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
Enhances the reliability and accuracy of torque determination, enabling smoother shifting and improved engine performance with reduced emissions and fuel consumption.
Implementation Method 1
Due to the fact that, by injecting water, the combustion process in the internal combustion engine is 'delayed'
Data Source
AI summary
A method for operating an internal combustion engine. A torque emitted from the internal combustion engine is determined by a torque model based on operating parameters of the internal combustion engine. Using a water injection system, water is injected into an intake tract of the internal combustion engine. A corrective parameter is determined using the torque model based on the amount of water injected by the water injection system. An internal combustion engine includes the water injection system and a control unit is configured so as to carry out the method for operating the internal combustion engine.