Variable Geometry Turbocharger Exhaust Temperature Control
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Solution Overview
Problem
Existing engine control systems for variable geometry turbochargers do not effectively adjust exhaust gas temperature and intake manifold pressure based on multiple operational parameters, such as engine speed, airflow rate, and requested braking power, leading to inefficient operation of particulate collection and aftertreatment devices, especially under low temperature conditions.
Innovation Solution
An engine control module (ECM) that determines and adjusts the position of adjustable vanes in a variable geometry turbocharger and/or the throttle valve based on engine speed, exhaust gas temperature, airflow rate, intake manifold pressure, and requested engine braking power to maintain optimal operating conditions for particulate collection and aftertreatment devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the inlet vane position of the variable geometry turbocharger is adjusted to control exhaust gas temperature, then the exhaust gas temperature can be increased or decreased, but the control strategy does not evaluate other engine parameters (speed, airflow rate, intake manifold pressure) to determine when to adjust the vane position
Solution Approach 1:
The control system dynamically adjusts the inlet vane position based on real-time evaluation of multiple engine parameters including speed, airflow rate, and intake manifold pressure. The ECM continuously monitors these parameters and modifies the VGT vane position accordingly to maintain optimal exhaust gas temperature for aftertreatment device operation.
Solution Approach 2:
The system changes multiple operating parameters simultaneously (inlet vane position, engine speed, airflow rate, intake manifold pressure) to achieve the desired exhaust gas temperature control. The ECM evaluates combinations of these parameters to determine the optimal vane position adjustment.
2Temperature
If the inlet vane position is adjusted to control exhaust temperature, then aftertreatment device operation can be improved, but the intake manifold pressure and engine braking power are not controlled
Solution Approach 1:
The control system performs multiple functions simultaneously using the same variable geometry turbocharger mechanism. It controls exhaust gas temperature for aftertreatment device operation, regulates intake manifold pressure for engine braking, and optimizes engine performance based on a comprehensive evaluation of all monitored parameters including speed, airflow rate, and requested braking power.
Solution Approach 2:
The system dynamically coordinates adjustments of the inlet vane position to achieve multiple control objectives. The ECM evaluates the relative importance of different parameters (temperature control vs. pressure control vs. braking power) and adjusts the VGT operation accordingly to satisfy multiple competing demands.
3Reliability
If a particulate collection device and aftertreatment device are used to remove emissions, then emissions control is improved, but the devices require minimum operating temperature that is not maintained under certain conditions (idling, low environmental temperatures)
Solution Approach 1:
The control system takes preliminary action by proactively monitoring engine operating conditions and predicting when exhaust gas temperature may drop below the minimum required for aftertreatment device operation. Before the temperature actually drops, the ECM adjusts the inlet vane position to maintain sufficient exhaust temperature, preventing the aftertreatment devices from operating inefficiently.
Solution Approach 2:
The system uses feedback from temperature sensors and engine parameter monitors to continuously adjust the variable geometry turbocharger operation. The ECM receives feedback on actual exhaust gas temperature and engine conditions, then modifies the inlet vane position to maintain the temperature range necessary for effective particulate collection and emissions conversion.
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 ECM ensures efficient operation of particulate collection and aftertreatment devices by adjusting exhaust gas temperature and intake manifold pressure, enhancing their longevity and performance, particularly in low temperature conditions or during engine idling.
Implementation Method 1
causing, by the ECM, one or more components of a variable geometry turbocharger (VGT) to adjust based on at least two of the information concerning the speed of the engine, the information concerning the exhaust gas temperature, the information concerning the engine airflow rate, the information concerning the pressure of the intake manifold associated with the engine
Implementation Method 2
The particulate collection device, the exhaust aftertreatment device, and/or the like may use heat from the exhaust gas, in conjunction with an oxidation catalyst (e.g., a diesel oxidation catalyst (DOC)), to facilitate removing and/or converting the particulate matter and/or other emissions
Data Source
AI summary
An engine control module (ECM) may obtain information concerning a speed of an engine, information concerning an exhaust gas temperature, information concerning an engine airflow rate, information concerning a pressure of an intake manifold associated with the engine, and information concerning a requested amount of engine braking power. The ECM may cause one or more components of a variable geometry turbocharger (VGT) to adjust based on the information concerning the speed of the engine, the information concerning the exhaust gas temperature, and the information concerning the engine airflow rate. Additionally, or alternatively, the ECM may cause the one or more components of the VGT to adjust based on the information concerning the pressure of the intake manifold associated with the engine and the information concerning the requested amount of engine braking power.