Hybrid Power Split Control Using Emissions Sensor Feedback
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Solution Overview
Problem
Conventional hybrid vehicle systems face challenges in effectively controlling emissions due to fault conditions and aging components in engine and aftertreatment systems, leading to elevated levels of harmful gases like NOx, despite the use of emissions reduction technologies.
Innovation Solution
A system and method that utilize emissions sensors to adjust engine and electric motor operating points, reducing emissions by decreasing engine load and increasing electric motor power output to maintain vehicle power demands while minimizing NOx production, even under suboptimal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine operates at high power output to meet vehicle power demands, then vehicle performance is maintained, but emissions levels increase and exceed regulatory thresholds
Solution Approach 1:
The system dynamically adjusts the operating points of both the engine and electric motor based on real-time emissions sensor feedback. The controller continuously monitors emissions levels and modifies the power distribution between engine and motor to maintain compliance while meeting power demands, rather than using fixed operating modes.
Solution Approach 2:
The system changes operational parameters (power output, load distribution) of the engine and electric motor based on emissions feedback. When emissions exceed thresholds, the controller adjusts engine operating point and electric motor power contribution to reduce emissions while maintaining overall vehicle power output.
2Object-generated harmful factors
If the engine operating point is adjusted to reduce emissions, then emissions compliance is achieved, but vehicle power output decreases
Solution Approach 1:
The system merges the power output of the engine and electric motor to maintain overall vehicle power demand. When the engine operating point is adjusted to reduce emissions, the electric motor compensates by increasing its power contribution, ensuring the combined power output meets vehicle requirements.
Solution Approach 2:
The electric motor acts as an intermediary to compensate for power loss when the engine operating point is adjusted for emissions reduction. The controller coordinates between the engine and motor, using the motor to make up the power difference created by emissions-focused engine adjustments.
3Power
If the electric motor power output is increased to compensate for engine power reduction, then vehicle power demands are maintained, but energy consumption increases
Solution Approach 1:
The system applies partial compensation from the electric motor rather than fully replacing engine power. The controller adjusts the motor power output to刚好 meet the power deficit created by emissions-focused engine adjustments, avoiding excessive energy consumption while maintaining power demands.
Data Source
AI summary
A system includes at least one sensor coupled to an aftertreatment system and a controller having at least one processor coupled to at least one memory device storing instructions that, when executed by the at least one processor, cause the controller to perform operations. The operations include: adjusting an operating point of an engine in response to emissions information from the at least one sensor and based on a fault indicator regarding a component of the system; and, controlling an electric motor in response to the adjustment of the operating point of the engine based on a change in power output from the engine to assist in a desired emissions characteristic.