Engine Launch Prohibition for Exhaust Aftertreatment Heating
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Solution Overview
Problem
Internal combustion engines emit high levels of pollutants during the initial launch after a long standstill due to the inefficiency of the exhaust-gas aftertreatment system, which is not yet at its operating temperature, leading to high emissions.
Innovation Solution
A method where the drivetrain operates in a first state with the engine at idle to heat the exhaust-gas aftertreatment system, activating a launch prohibition until it reaches a predefined temperature, then transitions to a second state allowing engine launch with limited power to maintain efficiency and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the internal combustion engine is allowed to launch immediately after starting, then the vehicle can be driven without delay, but high emissions occur because the exhaust-gas aftertreatment system is not yet at operating temperature
Solution Approach 1:
The system performs preliminary heating of the exhaust-gas aftertreatment system by operating the internal combustion engine at idle before allowing launch. This preliminary action ensures the aftertreatment system reaches operating temperature in advance, eliminating the trade-off between launch delay and emissions.
2Object-generated harmful factors
If the engine is operated at idle to heat the exhaust-gas aftertreatment system, then emissions are reduced, but the vehicle cannot be launched during this heating phase
Solution Approach 1:
The system dynamically adjusts the operating state of the internal combustion engine based on the temperature of the exhaust-gas aftertreatment system. When the aftertreatment system reaches operating temperature, the system automatically transitions from idle operation to allowing launch, making the launch prohibition time-dependent and adaptive rather than fixed.
3Object-generated harmful factors
If launching is prohibited during the heating phase, then emissions are controlled, but the driver cannot engage gear or launch the vehicle
Solution Approach 1:
The control device continuously monitors the temperature of the exhaust-gas aftertreatment system and provides feedback to determine when launch is permitted. This feedback mechanism ensures that the launch prohibition is automatically lifted as soon as the aftertreatment system reaches operating temperature, maintaining both emission control and operational responsiveness.
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 method ensures the exhaust-gas aftertreatment system reaches optimal efficiency before allowing engine launch, significantly reducing emissions by avoiding high power demands during inefficient system operation.
Implementation Method 1
The exhaust-gas aftertreatment system is heated by means of the internal combustion engine, in particular by means of the exhaust gases thereof
Data Source
AI summary
A method for operating an internal combustion engine of a drivetrain of a vehicle during launching. The vehicle has an exhaust-gas aftertreatment system for purifying exhaust gas of the engine. After a starting operation of the engine, the drivetrain is operated in a first operating state. In this first operating state, the engine is operated at idle, the exhaust-gas aftertreatment system is heated by the internal combustion engine, and a launch prohibition is active. The launch prohibition that is active in the first operating state prevents launching using the internal combustion engine. After a predefined state of the exhaust-gas aftertreatment system has been attained, the drivetrain is operated in a second operating state. The launch prohibition is inactive in the second operating state, such that launching using the engine is possible in the second operating state.