Exhaust Filter Temperature Control During Engine Warm-Up
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Solution Overview
Problem
Existing temperature rise control methods for vehicle filters do not adequately consider the decrease in friction torque during engine warm-up, leading to potential excessive or insufficient filter temperature rises, which can result in filter clogging.
Innovation Solution
A vehicle system that includes a sensor to detect a correlation value related to engine friction torque and a control unit to adjust the temperature rise rate of the exhaust gas by controlling engine parameters such as ignition timing, EGR rate, air-fuel ratio, and battery charging rate, ensuring the filter temperature is maintained within a target range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature rise control is executed without considering friction torque decrease, then filter temperature can be raised to prevent clogging, but filter temperature may excessively rise or insufficiently rise leading to clogging
Solution Approach 1:
The control unit receives correlation values from sensors that indicate friction torque changes, and uses this feedback to dynamically adjust the temperature rise control strategy. The control unit increases the temperature rise rate as friction torque decreases, preventing both excessive and insufficient temperature rise.
Solution Approach 2:
The temperature rise control is made dynamic by continuously adjusting the temperature rise rate based on real-time friction torque conditions. The control unit modifies ignition timing and other parameters dynamically throughout the engine warm-up process to maintain optimal filter temperature.
2Productivity
If engine warm-up is completed, then friction torque decreases improving engine efficiency, but exhaust gas temperature decreases reducing filter cleaning effectiveness
Solution Approach 1:
The control unit changes engine operating parameters including ignition timing (retarding it), EGR rate, and air-fuel ratio to increase exhaust gas temperature despite decreased friction torque. These parameter changes compensate for the natural temperature drop during warm-up completion.
Solution Approach 2:
The control unit executes periodic temperature rise control cycles during engine operation, adjusting parameters at appropriate intervals to maintain filter temperature within target ranges while allowing engine efficiency improvements.
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
This solution effectively prevents excessive or insufficient filter temperature rises, thereby ensuring the filter is adequately cleaned and clogging is prevented, even as engine friction torque decreases during warm-up.
Implementation Method 1
a control unit configured to execute temperature rise control for raising a temperature of the filter by controlling the engine to raise a temperature of exhaust gas of the engine
Implementation Method 2
an increase in a required charging rate per unit time of a battery charged with electric power generated by power of the engine
Data Source
AI summary
A vehicle includes an engine as a traveling power source, a filter that collects exhaust particulates from the engine, a sensor configured to detect a correlation value correlated with a friction torque of the engine, and a control unit configured to execute temperature rise control for raising a temperature of the filter by controlling the engine to raise a temperature of exhaust gas of the engine.