Variable Turbocharger Boost Control for Aftertreatment Thermal Management
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Solution Overview
Problem
Industrial vehicles with large displacement engines face challenges in achieving and maintaining the light-off temperature of their after-treatment systems, leading to fuel consumption penalties ranging from 2% to 14%, due to existing thermal management strategies that worsen drivability when sudden load requests occur.
Innovation Solution
Implementing a variable geometry turbocharger and a controllable wastegate with an advanced driver-assistance system (ADAS) that predicts forthcoming load requests to adjust turbocharger boost pressure, reducing it during thermal management and restoring it when necessary to maintain drivability and increase ATS temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If engine inlet and/or outlet throttling is applied to achieve light-off temperature, then ATS temperature is improved, but fuel consumption increases
Solution Approach 1:
The system dynamically adjusts the turbocharger boost pressure based on real-time conditions. During thermal management phase, boost pressure is reduced to increase exhaust temperature. When light-off temperature is achieved or during transient conditions, boost pressure is restored to rated values. This dynamic adjustment optimizes the balance between ATS temperature and fuel consumption.
Solution Approach 2:
The invention changes the boost pressure parameter as a control variable to manage ATS temperature. By varying the boost pressure set-point between reduced and rated values based on temperature feedback and drive conditions, the system achieves thermal management while minimizing fuel consumption penalties.
2Temperature
If turbocharger boost is reduced to increase ATS temperature, then exhaust temperature is improved, but drivability worsens
Solution Approach 1:
The system dynamically switches between reduced boost mode and rated boost mode based on real-time conditions. When sudden load requests are detected or when ATS temperature reaches light-off, the boost pressure is immediately restored to rated values, ensuring responsive drivability while maintaining thermal management benefits during steady-state operation.
Solution Approach 2:
The control system uses feedback from temperature sensors and drive condition detection to adjust boost pressure. When ATS temperature indicates thermal management is complete or when drive conditions suggest upcoming load requests, the system restores boost pressure to rated values, ensuring drivability is maintained while achieving thermal management goals.
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 approach enhances ATS temperature without compromising drivability, as the ADAS ensures turbocharger boost reduction appears transparent to the driver, maintaining vehicle performance and reducing fuel consumption penalties.
Implementation Method 1
variable geometry turbocharger
Implementation Method 2
exhaust temperatures reaching the ATS
Data Source
Figure 1~2
AI summary
Method for thermal management of an After treatment system (ATS) of a vehicle provided with a turbocharged internal combustion engine, an ATS to treat exhaust gas produced by said internal combustion engine, and a drive assist system (ADAS) capable to interact with at least said internal combustion engine, the turbocharger comprising a variable turbine and/or an controllable waste-gate, the method comprising a cyclic execution of a first step of reducing a turbocharger boost set-point when a temperature of said ATS is below a predetermined threshold and a second step of restoring said boost set-point to a rated value when said drive assist system foresees a forthcoming relevant torque request.