Dynamic Compression Ratio Control for Particulate Filter Regeneration
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Solution Overview
Problem
Existing methods for regenerating particulate filters in gasoline engine exhaust systems often compromise engine torque performance by actively raising exhaust gas temperatures.
Innovation Solution
A system and method that adjust the compression ratio and expansion ratio to achieve a desired exhaust temperature while optimizing torque output, using control signals generated by a processor to manage valve timing, ignition timing, injection timing, and other engine parameters, based on models like predictive control or proportional-integral-derivative models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exhaust gas temperature is actively raised to regenerate the particulate filter, then the filter regeneration is effective, but engine torque performance deteriorates
Solution Approach 1:
The invention changes the compression ratio parameter dynamically to achieve the desired exhaust temperature for filter regeneration. By adjusting the compression ratio, the system can raise exhaust temperature to enable regeneration while maintaining better torque performance compared to conventional methods that use fuel injection or throttle adjustments.
Solution Approach 2:
The system dynamically adjusts the compression ratio in real-time based on regeneration needs and engine operating conditions. The compression ratio can be varied during the engine cycle to optimize both regeneration effectiveness and torque output, transitioning from a static parameter to a dynamic control variable.
2Temperature
If compression ratio is increased to raise exhaust temperature, then regeneration effectiveness improves, but engine efficiency may deteriorate
Solution Approach 1:
The invention changes the compression ratio parameter dynamically to achieve the desired exhaust temperature for filter regeneration. By adjusting the compression ratio, the system can raise exhaust temperature to enable regeneration while maintaining better torque performance compared to conventional methods that use fuel injection or throttle adjustments.
Solution Approach 2:
The system recovers energy that would otherwise be wasted by utilizing the expansion stroke to drive the piston during regeneration events. By coordinating compression ratio changes with engine braking and coasting phases, the system recovers some of the energy that would be lost during high-temperature regeneration periods.
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
Enables effective particulate filter regeneration while maintaining optimal engine torque performance by dynamically controlling engine parameters to achieve the necessary exhaust temperature without compromising torque output.
Implementation Method 1
the compression ratio is increased to increase the exhaust temperature
Data Source
AI summary
Methods and systems for enabling regeneration of a particulate filter of an engine system are provided. In one embodiment, a method includes: receiving, by a processor, a request for particulate filter regeneration; in response to the request, determining, by the processor, at least one of a compression ratio and an expansion ratio; generating, by the processor, control signals to actuators of the engine system to adjust the at least one of the compression ratio and the expansion ratio to achieve a desired exhaust temperature; generating, by the processor, control signals to actuators of the engine system to optimize torque output based on the desired exhaust temperature, engine speed, and a desired engine load; and initiating, by the processor, regeneration of the particulate filter based on the command signals.