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 system to adjust for injector drift and system noise, thereby improving the accuracy of broadcast engine torque values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If torque based fuel values are determined using commanded fueling values and reverse look-up tables, then the broadcast engine torque value can be calculated, but fueling system variations such as injector drift and system level noises cause inaccuracies in the torque calculation
Solution Approach 1:
The patent implements a feedback mechanism by monitoring actual fueling delivery and comparing it against commanded fueling values. The system continuously adjusts fueling commands based on detected deviations caused by injector drift and system noise, thereby maintaining accurate torque calculations despite fueling system variations over time
Solution Approach 2:
The system dynamically adjusts fueling parameters by detecting actual fueling delivery characteristics and modifying commanded fueling values accordingly. This involves changing fueling delivery parameters in real-time to compensate for injector drift and system level noises, ensuring accurate torque determination
2Device complexity
If commanded fueling values are used to determine engine torque without accounting for fueling errors, then the calculation process is simple, but the accuracy of broadcast engine torque values deteriorates due to injector drift and system noises
Solution Approach 1:
The patent introduces an intermediary feedback mechanism that mediates between commanded fueling values and actual torque determination. This intermediary system detects fueling delivery variations and translates them into corrective adjustments, bridging the gap between simple commanded values and accurate torque calculations without requiring complex direct measurement
Data Source
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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.