Extending Sensor Adaptation Time via Electric Motor Torque Transfer
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Solution Overview
Problem
The existing methods for monitoring and adapting sensors and actuators in the induction and exhaust systems of internal combustion engines face challenges in achieving a defined and sufficiently long period of time without disrupting the driver, as the available window for these tasks is short and variable due to engine speed decrease influenced by friction and inertia.
Innovation Solution
The method involves extending the period of fresh air flow through the engine by transferring a positive torque from an electric motor to the internal combustion engine, which is smaller than the negative torque from internal friction, allowing for longer monitoring and adaptation times without fuel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the drive train is opened by disengaging the clutch to achieve sensor monitoring and actuator adaptation, then fresh air flows through the engine enabling defined monitoring conditions, but the useful period of time is relatively short and may not be sufficient to fully flood the induction system and exhaust system with fresh air
Solution Approach 1:
The electric motor applies positive torque to the engine before the monitoring and adaptation tasks are completed, thereby extending the time window during which fresh air flows through the engine. This preliminary action ensures that the induction system and exhaust system have sufficient time to be fully flooded with fresh air, enabling complete sensor monitoring and actuator adaptation without rushing the process or compromising measurement accuracy
2Duration of action of moving object
If the monitoring or adapting is carried out in an engine braking mode with the drive train closed to extend the useful period of time, then the monitoring window is lengthened, but the rate of decrease in revolution rate depends on driving conditions and the drive train being kept closed, so no well-defined conditions for monitoring and adaptation tasks are achieved
Solution Approach 1:
The system changes the torque parameter by applying positive torque from the electric motor to the engine during the monitoring and adaptation phase. This parameter change creates a controlled deceleration profile that is independent of driving conditions, ensuring well-defined monitoring conditions while extending the useful period of time. The positive torque compensates for friction losses and allows the engine speed to decrease at a controlled rate, providing stable and reproducible conditions for sensor monitoring and actuator adaptation
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 provides well-defined conditions for monitoring and adapting sensors and actuators by prolonging the time window during which fresh air flows through the engine, enabling comprehensive calibration and diagnostics before engine speed reaches idling.
Implementation Method 1
transferring a positive torque produced by an electric motor to the internal combustion engine
Implementation Method 2
a negative torque resulting from an internal friction of the internal combustion engine
Data Source
AI summary
Methods and systems are provided for monitoring and adapting sensors and actuators in the induction system and exhaust system of an internal combustion engine during a period of time in which fresh air is flowing through the internal combustion engine without fuel delivery. According to the disclosure, the period of time in which fresh air is flowing through the internal combustion engine when fuel delivery is turned off and the monitoring and adapting is being carried out is extended by transferring torque produced by electric motor to the internal combustion engine.