Hybrid Drive Exhaust Aftertreatment Temperature Control
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Solution Overview
Problem
In hybrid drive vehicles, maintaining optimal operating temperatures for exhaust-gas aftertreatment devices is challenging, especially during low-load operations, where combustion stability issues and excessive engine oil contamination occur, and achieving high exhaust-gas temperatures for soot filter regeneration is difficult, particularly in diesel engines.
Innovation Solution
A method for controlling the hybrid drive to operate the engine, non-combustion motor, or both based on the exhaust aftertreatment device temperature, adjusting the flow of exhaust gases through the device to maintain optimal temperatures, using the engine to heat up the device when necessary and utilizing the non-combustion motor to assist in reducing load demand and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine operates in the low-load range to reduce fuel consumption, then fuel efficiency is improved, but combustion stability deteriorates and excessive fuel precipitation on cylinder walls occurs
Solution Approach 1:
The system dynamically switches between different drive modes (engine-only, motor-only, hybrid) based on real-time temperature conditions of the aftertreatment device. This dynamic adaptation allows the engine to operate in low-load range only when temperature conditions permit, while switching to motor-driven mode when temperature would drop below optimal ranges, thus maintaining both fuel efficiency and combustion stability.
Solution Approach 2:
The control system monitors temperature parameters of the aftertreatment device and adjusts the drive mode accordingly. When temperature falls below a predetermined threshold, the system changes operational parameters by switching from engine-driven to motor-driven mode, preventing temperature-related combustion issues while maintaining fuel efficiency.
2Use of energy by moving object
If the engine operates in the low-load range to reduce fuel consumption, then fuel efficiency is improved, but engine oil contamination increases
Solution Approach 1:
The system dynamically adjusts the proportion of engine vs. motor operation based on aftertreatment device temperature. By reducing engine operation time in low-load range through strategic switching to motor-driven mode, the system minimizes fuel precipitation events that cause oil contamination, while still achieving overall fuel efficiency improvements.
Solution Approach 2:
The system uses the presence of a non-combustion motor as a beneficial resource to replace engine operation during temperature-sensitive periods. This converts the motor's capability into a protective function that prevents harmful fuel precipitation and oil contamination, while the engine continues to operate efficiently during appropriate temperature windows.
3Reliability
If the exhaust-gas temperature is increased for soot filter regeneration, then soot filter performance is improved, but achieving high temperatures becomes difficult in the low-load range
Solution Approach 1:
The system dynamically controls the drive mode to ensure sufficient exhaust-gas temperature for soot filter regeneration. By switching to engine-driven mode when regeneration is needed, the system guarantees adequate temperature levels even during low-load operations, ensuring reliable soot filter maintenance while preserving overall fuel efficiency through strategic motor usage.
Solution Approach 2:
The control system proactively monitors aftertreatment device temperature and predicts when temperature may fall below regeneration thresholds. It performs preliminary switching to engine-driven mode before temperature becomes critically low, ensuring sufficient temperature for soot filter regeneration while minimizing unnecessary engine operation through advance planning.
4Object-generated harmful factors
If the hybrid drive operates only by the non-combustion motor to reduce emissions, then pollutant emissions are reduced, but the exhaust aftertreatment device temperature may fall below optimal operating range
Solution Approach 1:
The system dynamically switches between motor-driven and engine-driven modes based on real-time temperature monitoring. When aftertreatment device temperature approaches or falls below the predetermined threshold, the system transitions from motor-only operation to engine-driven operation, ensuring temperature maintenance while minimizing engine usage to keep emissions low during appropriate temperature windows.
Solution Approach 2:
The control system continuously monitors the temperature of the exhaust aftertreatment device and uses this feedback to adjust the drive mode. When temperature feedback indicates the device is within the optimal operating range, the system permits motor-driven operation to reduce emissions. When temperature feedback shows the threshold is approaching, the system switches to engine-driven mode to maintain temperature, creating a closed-loop control that balances emissions and temperature requirements.
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 ensures efficient operation and purification of the exhaust-gas aftertreatment device by maintaining desired temperature windows, improving conversion performance and reducing contamination, while allowing for effective regeneration of soot filters.
Implementation Method 1
conducting exhaust gas of the hybrid drive at least partially through the exhaust aftertreatment device
Implementation Method 2
the temperature of the exhaust aftertreatment device is increased by the exhaust gas of the combustion engine
Data Source
AI summary
A method for controlling an exhaust gas aftertreatment device of a vehicle hybrid drive is provided. The method comprises operating the hybrid drive only by a combustion engine, only by a non-combustion motor, or by both, as a function of a temperature of the exhaust aftertreatment device, and conducting exhaust gas of the hybrid drive at least partially through the exhaust aftertreatment device, the engine and motor each providing output to power the vehicle. In this way, the aftertreatment device may be operated at an optimal temperature for conversion performance.