Engine Control Map Correction for Deposit Detection
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Solution Overview
Problem
Existing control devices for internal combustion engines cannot effectively respond to variations in flow reduction rates due to clogging conditions across different throttle opening degrees and fail to detect deposit accumulation in hybrid electric vehicles (HEVs) without an idle condition.
Innovation Solution
A control device with a map storage section and a map correction section that adjusts throttle valve characteristics based on flow rate measurements, using a weighted average for correction when necessary, to account for deposit adhesion and maintain accurate air flow estimation even without an idle state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the deposit accumulation amount calculated in the idle state is reflected in the whole operation range, then the control can be simplified, but the response to flow reduction rate variations due to different clogging conditions at different throttle opening degrees deteriorates
Solution Approach 1:
The patent divides the throttle opening degree range into multiple segments (first through fourth ranges) and calculates deposit accumulation amounts separately for each segment. This segmentation allows the system to account for different flow reduction characteristics at different opening degrees while maintaining a structured approach to correction.
Solution Approach 2:
The patent applies different correction amounts to different throttle opening degree ranges based on locally measured flow reduction rates. Instead of using a single global correction, the system tailors the correction to match the specific clogging conditions observed in each operational segment.
2Reliability
If the throttle opening degree is used to calculate deposit accumulation, then the clogging condition can be monitored, but the measurement accuracy deteriorates when the throttle opening degree is small
Solution Approach 1:
The patent performs preliminary measurements at multiple throttle opening degrees before final correction calculation. By pre-measuring flow reduction rates across different opening degrees and storing them as correction factors, the system prepares accurate correction data in advance for use during actual operation.
Solution Approach 2:
The patent introduces an intermediary correction mechanism that uses flow reduction rate measurements taken at specific throttle opening degrees as mediators. These intermediary measurements serve as reference data to correct the deposit accumulation calculations, bridging the gap between direct measurement limitations and accurate correction needs.
3Measurement precision
If the idle state is used to detect deposit accumulation, then the measurement can be performed under stable conditions, but the detection fails in HEVs without idle condition
Solution Approach 1:
The patent creates a universal deposit accumulation detection method that works across different vehicle types including both conventional vehicles with idle states and HEVs without idle states. The system achieves this by using throttle opening degree-based measurements that can be performed during normal driving operations regardless of whether an idle state exists.
Solution Approach 2:
The patent changes the measurement parameter from idle-state-specific conditions to throttle opening degree-based conditions. This parameter change allows the system to adapt to different vehicle operating modes, enabling deposit accumulation detection in HEVs during transient or part-load operations where the throttle valve moves between opening degrees.
Data Source
AI summary
A control device of an internal combustion engine can respond to the variation of the flow reduction rate attributable to the difference in a clogging condition, and which can detect a deposit accumulation amount even if no idle condition is provided like HEV, etc. In a control device of an internal combustion engine, a map correction section determines a correction amount in accordance with an approximate line result based on an air amount at a predetermined opening degree at which the measurement of the air amount by an air flow meter is sufficiently performed with the exception of a first predetermined opening degree in the case where the measurement of the air amount by the air flow meter has not been performed sufficiently in the first predetermined opening degree in a current operation cycle.