Engine Torque Broadcast Correction for Fueling Error Drift
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Solution Overview
Problem
Existing methods for determining broadcast engine torque values in internal combustion engines fail to account for fueling system variations such as injector drift and system level noises, leading to inaccuracies in torque calculations.
Innovation Solution
A system and method that compensates for fueling errors by determining torque based fuel values and correcting fuel amounts provided to the engine, using an electronic control unit to adjust broadcast engine torque values based on actual fuel injection, thereby improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If torque broadcast values are determined using commanded fueling values and reverse look-up tables, then the calculation process is simplified, but accuracy deteriorates due to fueling system variations such as injector drift and system level noises
Solution Approach 1:
The patent applies feedback by using actual injected fuel quantity measurements to adjust and correct the commanded fueling values. The system continuously monitors the difference between commanded and actual fuel injection, then uses this feedback to compensate for fueling errors in torque calculations, thereby maintaining accuracy despite fueling system variations.
Solution Approach 2:
The patent changes the parameter basis for torque calculation from commanded fueling values to actual injected fuel quantity. By shifting from using theoretical commanded values to measured actual values, the system accounts for fueling system variations and maintains calculation accuracy while still using a relatively simple measurement approach.
2Ease of operation
If commanded fueling values are used without accounting for fueling system variation, then the system operation is simplified, but reliability deteriorates over time due to injector drift and system level noises
Solution Approach 1:
The system implements feedback by continuously monitoring actual fuel injection quantities and using this information to correct for fueling errors. This feedback mechanism maintains reliability over time by compensating for injector drift and system variations without requiring complex operational procedures.
Solution Approach 2:
The system performs self-correction by automatically adjusting torque calculations based on measured fueling errors. The control unit independently compensates for fueling system variations without requiring external intervention or complex operational procedures, thereby maintaining both ease of operation and reliability.
3Measurement precision
If actual injected fuel quantity is measured and used to correct fueling errors, then torque calculation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses feedback from actual fuel injection measurements to correct torque calculations. This approach achieves high accuracy by incorporating real measurement data while keeping the additional complexity minimal through straightforward feedback integration into the existing control system.
Solution Approach 2:
The system changes the input parameter from commanded fueling value to actual injected fuel quantity. This parameter change improves accuracy by using measured rather than theoretical values, while the implementation remains relatively simple by directly utilizing existing fuel injection measurement capabilities.
Data Source
AI summary
The accuracy of the torque broadcast values from an engine control unit is the subject of regulatory requirements for automotive systems since the broadcast torque values are used in calculations to determine regulatory compliance. A system is disclosed herein that includes a powertrain including an engine configured to output torque to a driveline, and an electronic control system operatively coupled with the powertrain. The electronic control system is configured to determine a broadcast engine torque value that is corrected for fueling error between torque based fuel values determined during operation of the engine and the fuel amount that is provided to the engine. The correction for fueling error improves the accuracy of the torque broadcast values.