Engine Speed Hold Control for Gasoline Particulate Filter Temperature
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Solution Overview
Problem
Setting a lower limit for engine revolution speed based on gasoline particulate filter (GPF) temperature can cause abrupt changes affecting vehicle operability when the setting is canceled due to temperature changes.
Innovation Solution
A vehicle control method that sets a lower limit for engine revolution speed when the GPF temperature is within specific ranges and continues this setting until the accelerator is turned on, thereby stabilizing engine speed changes and reducing operability impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lower limit for engine revolution speed is set based on GPF temperature, then the GPF regeneration process is promoted and rattling noise is suppressed, but the engine revolution speed may abruptly change when the lower limit setting is canceled, affecting vehicle operability
Solution Approach 1:
The control device continues the lower limit setting for a predetermined period after the GPF temperature reaches the first threshold value, before canceling the setting. This preliminary continuation action prevents abrupt engine speed changes that would occur if the setting were immediately canceled, thereby maintaining vehicle operability while still achieving GPF regeneration.
Solution Approach 2:
By maintaining the lower limit setting beyond the temperature threshold, the system cushions against the potential abrupt change in engine speed. This creates a buffer period that smooths the transition and prevents sudden operability issues while ensuring the GPF regeneration process is adequately promoted.
2Speed
If the lower limit setting is canceled immediately when GPF temperature exceeds the threshold, then the control system responds quickly to temperature changes, but the engine revolution speed changes abruptly, affecting vehicle operability
Solution Approach 1:
The control device implements a predetermined period continuation of the lower limit setting after the temperature threshold is reached, rather than immediate cancellation. This preliminary action maintains responsive control while preventing abrupt engine speed changes that would harm vehicle operability.
3Temperature
If the lower limit for engine revolution speed is set to promote GPF regeneration, then the GPF temperature is maintained, but continuous setting may cause thermal deterioration of the GPF
Solution Approach 1:
The control device uses periodic action by setting the lower limit for engine revolution speed only during specific temperature conditions (when GPF temperature is at or below the first threshold or at or above the second threshold). By canceling the setting when the temperature is between the first and second thresholds, the system allows the GPF to cool down periodically, preventing thermal deterioration while maintaining adequate temperature for regeneration when needed.
Solution Approach 2:
The control device changes the operational parameters by introducing two different temperature thresholds (first threshold for promoting regeneration, second threshold for preventing overheating). This dual-threshold parameter system allows dynamic adjustment of the lower limit setting based on current temperature conditions, optimizing both regeneration and thermal protection.
Data Source
AI summary
Set a lower limit for an engine revolution speed when an accelerator is off while a temperature of the gasoline particulate filter is equal to or lower than a predetermined first temperature or equal to or higher than a predetermined second temperature, the predetermined second temperature being higher than the predetermined first temperature, and continue the lower limit setting for the engine revolution speed until the accelerator becomes on when the temperature of the gasoline particulate filter increases over the predetermined first temperature from the predetermined first temperature or lower or decreases below the predetermined second temperature from the predetermined second temperature or higher after the lower limit for the engine revolution speed is set.