Speed Control Dynamics Decoupling for Vehicle Simulation
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Solution Overview
Problem
Existing methods for simulating the dynamic behavior of vehicles using flywheel masses introduce time delays and instabilities due to the influence of speed control, leading to inaccurate simulations of dynamic processes.
Innovation Solution
A method and device that use a transfer element with a transfer function reciprocal to the control transfer function to decouple the speed control dynamics, allowing for precise simulation of target moments of inertia without time delays, by compensating for the inherent dynamics of the speed control through an integrator and compensation element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If speed control is used to simulate the dynamic behavior of vehicles using flywheel masses, then the simulation can be performed with a controllable test mass, but time delays and instabilities are introduced that lead to inaccurate simulations
Solution Approach 1:
The patent implements a feedback mechanism where the actual speed is continuously measured and compared with the target speed, and the deviation is used to adjust the drive torque. This closed-loop control ensures that the test mass accurately follows the target speed profile while compensating for disturbances, thereby maintaining simulation accuracy without introducing significant time delays.
Solution Approach 2:
The system uses the measured actual speed and torque to automatically calculate and adjust the target speed and drive torque without external intervention. The control algorithm self-regulates the simulation parameters based on real-time system state, eliminating the need for manual adjustments and reducing time delays associated with external control.
2Ease of operation
If a control transfer function is used to control the speed, then the speed can be regulated, but the inherent dynamics of the control cause time delays that make the test mass lag behind the real system
Solution Approach 1:
The patent calculates the target speed in advance based on the measured torque and the desired moment of inertia, before the actual speed control is applied. This preliminary calculation allows the system to anticipate the required speed changes and reduce time delays by preparing the control action ahead of time.
Solution Approach 2:
The control algorithm uses direct calculation methods to rapidly determine the target speed from the measured torque, skipping intermediate computational steps that would introduce time delays. The system rushes through the calculation and application of control actions to minimize the time lag between the real system and the simulated test mass.
3Adaptability or versatility
If the moment of inertia of the test mass differs from the vehicle moment of inertia, then the simulation can be performed with available equipment, but the deviation requires speed control compensation that introduces errors
Solution Approach 1:
The patent dynamically changes the control parameters (target speed and drive torque) based on the measured torque and the ratio between the desired and actual moments of inertia. By adjusting these parameters in real-time, the system compensates for the mismatch between the test mass moment of inertia and the vehicle moment of inertia, maintaining simulation precision despite using available equipment.
Data Source
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AI summary
The invention relates to a method and a device for simulating a body (1) that is moved in a translational or rotational manner. A force that acts on the body (1) or a torque (Mw) that acts on the body (1) is detected, and a reference mass or a reference moment of inertia (Jsoll) is assigned to the body (1). The force or the torque (Mw) and the reference mass or the reference moment of inertia (Jsoll) are used to determine a reference speed (?soll) for a speed control which controls an actual speed (?ist) using a control transmission function (G(s)), and the reference speed (?soll) is determined by means of a transmission element (9) using a transmission function (P(s)) that is reciprocally proportional to the control transmission function (G(s)).