Hybrid Drive Control for Catalyst Temperature in Low-Load Phases
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Solution Overview
Problem
Hybrid vehicles face challenges in maintaining effective exhaust aftertreatment system operation during low-load phases, particularly when the catalyst temperature drops below a critical threshold, necessitating fuel-intensive heating measures to prevent degradation and ensure emissions compliance.
Innovation Solution
Implementing a method that monitors exhaust aftertreatment system temperature during low-load phases and deactivates the internal combustion engine if the temperature remains above a critical threshold, using predictive data to determine the duration of these phases and employing targeted heating measures to maintain catalyst temperature, such as internal engine heating or electric heaters, to avoid unnecessary cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal combustion engine is deactivated during low-load phases to improve energy efficiency, then fuel consumption is reduced, but the exhaust aftertreatment system temperature drops below the critical threshold requiring fuel-intensive heating measures
Solution Approach 1:
The control unit predicts the duration of the low-load phase in advance and makes a preliminary decision whether to deactivate the internal combustion engine. By forecasting future conditions using predictive data (navigation data, traffic data, charging state), the system determines ahead of time whether engine deactivation will occur, allowing it to maintain catalyst temperature above the critical threshold without requiring subsequent heating measures.
Solution Approach 2:
The system continuously monitors the actual duration of low-load phases and compares it with the predicted duration. This feedback mechanism allows the control unit to learn from past predictions and improve future decision-making, optimizing the balance between engine deactivation benefits and catalyst temperature maintenance requirements.
2Object-generated harmful factors
If the internal combustion engine is deactivated during low-load phases, then emissions are reduced, but the catalyst temperature drops below the critical threshold compromising emissions conversion
Solution Approach 1:
The control unit uses predictive data to forecast the duration of low-load phases in advance. By making a preliminary assessment of whether the low-load phase will be short or long, the system can decide beforehand whether to deactivate the internal combustion engine. This preliminary action ensures that the catalyst temperature remains above the critical threshold for emissions conversion while still achieving emissions reduction through selective engine deactivation.
3Reliability
If heating measures are continuously applied to maintain catalyst temperature, then emissions conversion is maintained, but energy efficiency deteriorates
Solution Approach 1:
The system implements a feedback mechanism that continuously monitors the actual duration of low-load phases and compares it with predicted durations. Based on this feedback, the control unit optimizes future decisions regarding engine deactivation and heating measure application. This feedback loop ensures that heating measures are applied only when necessary to maintain catalyst temperature, thereby improving overall energy efficiency while maintaining reliable emissions conversion.
Solution Approach 2:
The system changes the operational parameters of the internal combustion engine and heating measures based on predicted and actual low-load phase durations. By dynamically adjusting engine deactivation decisions and heating application timing, the system optimizes the balance between maintaining catalyst temperature for emissions conversion and minimizing energy consumption.
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 energy efficiency by reducing the need for fuel-intensive heating, improves emissions conversion, and maintains effective exhaust aftertreatment system performance by optimizing engine operation and heating strategies.
Implementation Method 1
a second drive as an internal combustion engine with an exhaust aftertreatment system, in particular with at least one catalyst
Implementation Method 2
cooling of the exhaust aftertreatment system can be avoided due to cold exhaust gas flowing through
Implementation Method 3
a cooling behavior of the exhaust aftertreatment system is modeled using an exhaust temperature
Data Source
AI summary
Method for operating a motor vehicle (10) having a hybrid drive, wherein the motor vehicle (10) comprises a first drive (12) having an electric motor (14) associated with an electrical energy store (16), and a second drive as an internal combustion engine (22) having an exhaust aftertreatment system, in particular having at least one catalyst (24),wherein permanent monitoring for detecting a low-load phase for the drive of the motor vehicle (10) is performed,wherein monitoring of a temperature for the exhaust aftertreatment system, in particular a temperature for the at least one catalyst (24) of the exhaust aftertreatment system, is performed as a function of the detected low-load phase,wherein further operation or deactivation of the internal combustion engine (20) is performed as a function of a critical temperature (Tkrit) for the exhaust aftertreatment system and a modeled cooling of the exhaust gas treatment system.