Hybrid Vehicle Sooty Smoke Filter Regeneration via Downhill Exhaust Heating
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Solution Overview
Problem
Hybrid vehicles equipped with sooty smoke filters, such as gasoline particulate filters, face inefficiencies in regeneration due to soot deposition, which increases exhaust pressure and can deteriorate engine performance, and existing methods like lean burn for regeneration can lead to engine roughness and reliability issues.
Innovation Solution
A sooty smoke filter regeneration control system that coordinates between an engine controller and a hybrid control unit to increase exhaust gas temperature based on road grade information, using lock-up of the engine clutch and fuel-cut during downhill sections to enhance regeneration efficiency and provide oxygen for soot burning, thereby improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lean burn is used for regeneration, then soot is burned off, but engine roughness increases and reliability deteriorates
Solution Approach 1:
The system changes the temperature parameter by utilizing exhaust gas temperature elevation during downhill driving to enable soot combustion without requiring lean burn mode, thus avoiding engine roughness and reliability issues while still achieving regeneration
Solution Approach 2:
The system utilizes the vehicle's own downhill kinetic energy to generate high-temperature exhaust gas that automatically combusts soot in the filter, eliminating the need for separate active regeneration control measures
2Quantity of substance
If separate engine control measures are implemented for regeneration, then soot is removed, but device complexity increases
Solution Approach 1:
The system merges the regeneration function with the existing downhill driving operation, using the same engine clutch lock-up and fuel-cut mechanisms already employed for energy recovery, thereby achieving soot removal without adding separate control systems
3Use of energy by moving object
If engine clutch lock-up and fuel-cut are performed during downhill, then fuel efficiency improves, but exhaust gas temperature must be maintained for regeneration
Solution Approach 1:
The system performs preliminary soot accumulation during normal operation, then utilizes the predetermined downhill section to generate the necessary exhaust temperature through clutch lock-up and fuel-cut, ensuring both fuel efficiency improvement and regeneration occur in sequence without conflict
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
The system increases regeneration efficiency of the sooty smoke filter and improves overall fuel efficiency by effectively managing soot deposition and temperature control in hybrid vehicles, reducing the need for separate engine control measures and enhancing vehicle performance.
Implementation Method 1
a sooty smoke filter installed in an exhaust line through which exhaust gas from the engine passes, and configured to filter out sooty smoke included in the exhaust gas
Implementation Method 2
a temperature sensor installed in the front end of the sooty smoke filter, and configured to measure the temperature of exhaust gas flowing into the front end of the sooty smoke filter
Implementation Method 3
controlling the temperature of exhaust gas flowing into the sooty smoke filter... so as to increase the temperature of exhaust gas flowing into the sooty smoke filter to be higher than a reference temperature
Implementation Method 4
perform lock-up of the engine clutch and fuel-cut... providing oxygen for soot burning
Data Source
AI summary
A sooty smoke filter regeneration control system of a hybrid vehicle, includes an engine, a sooty smoke filter installed in an exhaust line through which exhaust gas from the engine passes, and filtering out sooty smoke included in the exhaust gas; a temperature sensor installed in the front end of the sooty smoke filter, and measuring a temperature of exhaust gas flowing into the front end of the sooty smoke filter; an engine controller controlling a temperature of exhaust gas flowing into the sooty smoke filter and to control fuel injection of the engine, based on information associated with a grade of a road on which a vehicle is to drive; and a hybrid control unit controlling an engine clutch disposed between the engine and a motor that assists the engine in association with engine output, in response to a request from the engine controller.