Engine Stall Prediction via Rotational Speed Gradient Analysis
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Solution Overview
Problem
Existing control devices for motor vehicles struggle to accurately predict engine stalls during launch processes, leading to either premature activation of protective measures or potential damage to the dual-mass flywheel due to incorrect threshold settings for rotational speed.
Innovation Solution
A control device that predicts engine stalls by analyzing the rotational speed and gradient of the engine before clutch-engagement, using signals from the engine and gearbox input shaft, and initiates an increase in engine torque demand to prevent stalls and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high rotational speed threshold is used for stall detection, then protective measures are initiated early, but the likelihood of incorrect identification increases leading to unnecessary protective measures
Solution Approach 1:
The control device predicts a stall situation before the clutch-engagement rotational speed is reached by evaluating the rotational speed gradient. This preliminary detection allows the system to take preventive action (increasing engine torque demand) before the actual stall occurs, avoiding the need to set a high threshold that would cause false positives during normal operation.
Solution Approach 2:
Instead of using a fixed rotational speed threshold, the system dynamically evaluates the rotational speed gradient (rate of change of rotational speed). This dynamic approach allows the system to distinguish between normal rotational speed variations and actual stall conditions, improving detection accuracy without increasing false alarms.
2Object-generated harmful factors
If a low rotational speed threshold is used for stall detection, then false alarms are reduced, but the engine rotational speed may fall into the resonance range of the dual-mass flywheel causing component damage
Solution Approach 1:
The system performs preliminary stall prediction based on rotational speed gradient before the engine speed drops to dangerous levels. By detecting the trend of rotational speed decline in advance, the system can initiate protective measures (increasing torque demand) before the engine speed enters the resonance range, thus preventing both false alarms and component damage.
Solution Approach 2:
The control device continuously monitors the rotational speed and its gradient, creating a feedback loop that allows real-time adjustment of engine torque demand. This feedback mechanism enables the system to respond appropriately to actual stall conditions while ignoring normal variations, and to prevent the engine speed from reaching dangerous resonance ranges.
3Reliability
If additional sensors are installed to improve stall prediction accuracy, then detection reliability increases, but device complexity and cost increase
Solution Approach 1:
The control device utilizes existing sensor data (rotational speed signals already present in the vehicle's control system) and performs self-service by calculating the rotational speed gradient through mathematical evaluation. This approach achieves improved stall prediction accuracy without requiring additional physical sensors, thereby avoiding increased device complexity and cost.
Data Source
AI summary
A control device and method are provided for launch assistance for a motor vehicle having an internal combustion engine as drive engine. The control device is designed to predict a stall of the internal combustion engine of the motor vehicle on the basis of at least one signal, and, if a stall of the internal combustion engine is predicted, to output a signal for initiating launch assistance. The control device is designed to predict the stall of the internal combustion engine on the basis of the engine rotational speed of the internal combustion engine and the gradient of the engine rotational speed of the internal combustion engine before the clutch-engagement rotational speed is reached. If a stall of the internal combustion engine is predicted, the control device is designed to output a signal for initiating an increase of the engine torque demand of the internal combustion engine.