Propulsion Torque Calculation Using Internal Torque Estimation
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Solution Overview
Problem
The existing methods for determining propulsion torque on a test stand face challenges due to noisy and insufficiently resolved measurement signals for shaft torque and angle of rotation, which complicates the calculation of high-quality propulsion torque, especially when ancillary units are not present or accurately measured.
Innovation Solution
The method involves measuring internal torque and using it in an equation of motion to estimate a correction torque, which is then used to calculate the propulsion torque, accounting for influences like friction and ancillary units, with the option to model this correction torque based on angular velocity and continuously correct it for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If shaft torque and angle of rotation are measured directly on the test stand, then the propulsion torque can be calculated, but the measurement signals are noisy and insufficiently resolved, leading to poor calculation quality
Solution Approach 1:
The patent introduces an intermediary estimation process using the equation of motion as a mediator between the noisy direct measurements and the final propulsion torque calculation. By using the relationship M_dyn = M_V + M_W and estimating M_V through this intermediate equation, the system achieves better calculation quality than direct measurement would provide.
Solution Approach 2:
The patent replaces direct mechanical measurement of shaft torque with a computational approach using the equation of motion. Instead of relying solely on noisy mechanical sensors, the system substitutes the measurement process with a mathematical model that combines available measurements with physical laws to derive the propulsion torque.
2Reliability
If ancillary units are installed on the test bench to measure all torque influences, then complete torque accounting is achieved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the ancillary unit torques from the direct measurement requirement and represents them virtually through the estimation process. Instead of physically installing and measuring each ancillary unit's torque separately, the system extracts this information through the equation of motion estimation, eliminating the need for complex physical measurement setups.
Solution Approach 2:
The patent creates a virtual copy of the ancillary units' torque influence through the estimation model. Rather than requiring physical presence and direct measurement of all ancillary components, the system replicates their torque effects computationally, allowing complete torque accounting without physical complexity.
3Measurement precision
If the correction torque is estimated using the equation of motion with measured internal torque, then high-quality propulsion torque is achieved, but the measurement and calculation complexity increases
Solution Approach 1:
The patent makes the equation of motion serve multiple functions: it acts as both a physical model representing the system dynamics and as a calculation tool for estimating the correction torque. This multi-functionality allows the same mathematical relationship to provide both system understanding and precise measurement without requiring separate complex systems.
Solution Approach 2:
The patent implements feedback by using the measured internal torque from the torque generator to continuously update and refine the correction torque estimation through the equation of motion. This feedback loop ensures that the estimation adapts to actual system conditions, improving precision while using the same measurement infrastructure.
Data Source
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AI summary
The problem addressed by the invention is that of providing a qualitatively high-grade propulsion torque of a torque generator in a simple way for a test run from sometimes qualitatively poor measuring variables available on the test stand. This problem is solved in that an inner torque (Mi) of the torque generator (D) is measured, and based on the measured inner torque (Mi), a correction torque (Mcorr) is estimated from a motion equation with the measured inner torque (Mi), a dynamic torque (Mdyn), and a shaft torque (Mw) measured on an output shaft (8) of the torque generator (D). From the estimated correction torque (Mcor) and the measured inner torque (Mi), the propulsion torque (Mv) is calculated according to the equation Mv = Mcor + Mi.