Flywheel Torque Measurement via Gear Tooth Speed Variations
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Solution Overview
Problem
Existing engine torque measurement systems face inaccuracies and inefficiencies in determining engine torque, particularly in using flywheel acceleration, which affects vehicle performance and shift quality.
Innovation Solution
A system that utilizes a sensor to detect gear teeth on a flywheel, calculating engine torque by determining the amplitude of instantaneous speed variations and angular acceleration at the engine's firing frequency, with computational methods to enhance accuracy by analyzing multiple harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known engine torque measurement arrangements are used, then torque measurement is provided, but measurement precision is insufficient
Solution Approach 1:
The patent replaces traditional mechanical torque measurement systems with a computational approach. A sensor detects gear teeth positions on the flywheel, and a computational device calculates torque by analyzing speed variations and applying dynamic models. This substitution eliminates mechanical complexity and improves measurement precision while maintaining reliability through mathematical modeling of the drivetrain dynamics.
2Device complexity
If simple speed variation measurement is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces complex mechanical torque sensors with a computational device that processes simple speed variation data. The sensor only needs to detect gear tooth positions, and the computational device uses algorithms to extract torque information by analyzing speed variations at the engine firing frequency, thereby achieving high precision with minimal hardware complexity.
Solution Approach 2:
The patent transforms the measurement approach by changing from direct torque measurement to indirect measurement through speed variation analysis. By monitoring changes in flywheel speed at specific frequencies (engine firing frequency and harmonics), the system extracts torque information without requiring complex mechanical sensors, thus reducing device complexity while maintaining precision.
3Productivity
If traditional torque measurement methods are used, then basic torque data is obtained, but productivity in vehicle control is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the computational device continuously monitors speed variations and recalculates torque in real-time. The system processes sensor data through multiple calculations including speed variation analysis, frequency domain transformation, and dynamic model application, providing continuous feedback for precise torque measurement that enhances vehicle control productivity and 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 approach provides improved torque measurement accuracy, leading to enhanced vehicle performance and driver satisfaction through precise control of shifts and actuations.
Implementation Method 1
a sensor that is configured to detect gear teeth of a flywheel moving past the sensor
Implementation Method 2
The sensor provides an output signal having a sequence of amplitude peaks which occur simultaneous to the tips of the gears passing the sensor
Data Source
AI summary
A sensing system and method utilizes measured flywheel speed variations to determine engine torque. The measured engine torque can be used to control vehicle transmissions, clutches, and other vehicle components and systems.