Engine Braking Mode Selection via Aftertreatment Temperature Control
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Solution Overview
Problem
Existing engine systems face challenges in efficiently managing engine braking modes, particularly in maintaining optimal aftertreatment system temperatures during engine braking operations.
Innovation Solution
A system and method that utilize a controller to selectively enable engine braking modes based on temperature thresholds and braking power demand, ensuring optimal temperature management and braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If engine braking operation is enabled to slow down the vehicle, then braking performance is improved, but aftertreatment system temperature decreases
Solution Approach 1:
The system dynamically switches between different engine braking modes (first mode with greater braking power and second mode with lesser braking power) based on real-time temperature conditions. The controller monitors aftertreatment system temperature and adaptively selects the appropriate braking mode to balance braking performance requirements with temperature maintenance needs.
Solution Approach 2:
The system changes operational parameters by switching between different engine braking modes with distinct braking power characteristics. The first engine braking mode provides greater braking power when temperature is adequate, while the second mode provides lesser braking power when temperature needs to be maintained, effectively using parameter changes to resolve the contradiction.
2Power
If friction-based braking mechanism is used to slow down the vehicle, then braking performance is achieved, but friction brake life decreases
Solution Approach 1:
The system converts the potentially harmful effect of engine braking (temperature decrease) into a beneficial strategy by using it selectively to extend friction brake life. Engine braking is employed primarily on downhill slopes or when additional braking is needed, reducing wear on friction brakes while the control system manages temperature effects through mode switching.
3Adaptability or versatility
If multiple engine braking modes are available to satisfy different braking power demands, then braking performance adaptability is improved, but system complexity increases
Solution Approach 1:
The controller implements a feedback mechanism that continuously monitors aftertreatment system temperature and compares it against threshold values. Based on this feedback, the system automatically selects the appropriate engine braking mode, simplifying the control process despite the availability of multiple modes. The feedback loop ensures adaptive behavior without requiring complex manual intervention.
Data Source
AI summary
A system includes an aftertreatment system coupled to an engine and a controller communicably coupled to the engine and the aftertreatment system, the controller is configured to perform operations. The operations include receiving an engine braking request, and, responsive to receiving the engine braking request, enabling an engine braking operation whereby at least one engine braking mode of a plurality of engine braking modes is enabled and implemented. The operations include receiving a temperature value regarding a temperature of the aftertreatment system, comparing the temperature value to a first threshold or a second threshold, and selecting and implementing one of the one or more engine braking modes based on comparing the temperature value to the first threshold or the second threshold.