Electric Heater Control for Aftertreatment Catalyst Warmup
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Solution Overview
Problem
Existing exhaust aftertreatment systems in internal combustion engines face inefficiencies in maintaining catalyst temperatures during cold starts and low-load operations, leading to increased emissions and reduced catalytic activity.
Innovation Solution
Integration of an aftertreatment system heater powered by a motor-generator or battery, controlled by a controller to optimize power distribution between the engine and heater, balancing efficiency and emissions to achieve target exhaust gas temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an electric heater is integrated into the aftertreatment catalyst system to increase catalyst temperature and promote catalytic activity, then emissions reduction is improved, but engine performance tradeoffs and power consumption increase
Solution Approach 1:
The system dynamically adjusts heater power based on operating conditions (engine temperature, catalyst temperature, driver demand power) to optimize the balance between emissions reduction and power consumption. The controller modulates heater power as a continuously variable parameter rather than using fixed on/off control.
Solution Approach 2:
The heater power is made dynamically adjustable based on real-time system state. The controller continuously monitors engine temperature, catalyst temperature, and driver demand power to determine the optimal heater power level, creating a dynamic response to changing operating conditions.
2Productivity
If heater power is increased to rapidly warm up the catalyst to target temperature, then catalytic activity is improved, but engine performance and fuel consumption worsen
Solution Approach 1:
The system applies partial heating action rather than maximum heating. The heater power is set to a level that provides sufficient warmth to achieve catalytic activity while avoiding excessive power consumption. The controller determines an optimal heater power command that balances warmup speed with fuel economy considerations.
Solution Approach 2:
The system uses feedback from temperature sensors and engine operating parameters to continuously adjust heater power. The controller monitors catalyst temperature and engine temperature to determine when heating is sufficient and when power can be reduced or shut off, optimizing the balance between warmup speed and energy loss.
3Temperature
If the heater operates at high power to maintain exhaust gas temperature during low-load operations, then catalyst temperature is improved, but driver demand power and engine performance are compromised
Solution Approach 1:
The heater power is dynamically adjusted based on driver demand power and engine operating conditions. During low-load operations, the controller modulates heater power to maintain catalyst temperature while minimizing impact on available power for drivetrain demands. The system responds dynamically to changing driver power requests.
Solution Approach 2:
The system changes heater power parameters based on operating mode. When driver demand power is high, heater power is reduced or shut off to prioritize drivetrain performance. When driver demand is low and catalyst temperature requires maintenance, heater power is increased appropriately. The controller continuously adjusts the heater power parameter based on real-time conditions.
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
Enhances catalyst activity by maintaining or raising exhaust gas temperatures, reducing harmful emissions, and optimizing fuel consumption and engine performance during cold starts and low-load conditions.
Implementation Method 1
operating a heater with a heater power command not exceeding the allowable heater power to heat the exhaust gas to the target temperature
Data Source
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AI summary
A method for increasing a temperature of an exhaust gas to a target temperature is provided. The method includes determining, by a controller, a target energy of the exhaust gas and determining, by the controller, a target emissions based the target energy. The method further includes determining, by the controller, a tradeoff in a performance of an engine corresponding to one or more of the target emissions, an engine speed, and a driver demand power and determining, by the controller, an allowable heater power based on the tradeoff. The method further includes operating, by the controller, a heater with a heater power command not exceeding the allowable heater power to heat the exhaust gas to the target temperature.