Brake Test Bench Torque Simulation at Low Speeds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional brake test benches fail to accurately simulate the motion of a rotatable body at low speeds due to engine weakness, leading to undesirable stopping and unrealistic simulation results, which affects the testing of control systems for driving dynamics and stress/wear studies.
Innovation Solution
A method that specifies a target speed and braking value for a rotatable body on a brake test bench, using measured torques at higher speeds for extrapolation to determine torque values at low speeds, and employing a Kalman filter to account for actual torque and brake pressure for precise simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is used to rotate the real rotatable body at low speeds, then the brake test bench can simulate braking conditions, but the engine cannot maintain the specified rotation speed, leading to undesirable stopping
Solution Approach 1:
The system performs preliminary actions by detecting when the rotatable body comes to a standstill and proactively applying a release torque to prevent sticking, rather than waiting for the stopping problem to occur and then attempting to correct it
Solution Approach 2:
The system applies a preliminary anti-action by using the release torque mechanism to counteract the stick-slip effect before it causes problematic stopping, thereby maintaining continuous rotation and simulation validity
2Measurement precision
If the torque sensor measures torque on the stationary wheel, then the measurement signal is zero, but this leads to unrealistic simulation results where the simulated brake becomes ineffective
Solution Approach 1:
The simulation computer acts as an intermediary that receives the zero torque measurement from the torque sensor but does not directly use it. Instead, it applies a compensating release torque based on the brake pressure signal, thereby mediating between the unrealistic measurement and the realistic simulation requirement
Solution Approach 2:
The system uses feedback by continuously monitoring the brake pressure signal and using it to determine when to apply release torque, creating a closed control loop that maintains simulation realism despite measurement limitations
Data Source
AI summary
A method and an arrangement for simulating the motion of a rotatable body in a simulation computer using a brake test bench, which has an engine, a real rotatable body representing the simulated rotatable body and a brake. The method includes the method steps of: specifying a target speed, applying this target speed to the engine, rotating the real rotatable body, specifying a braking value, controlling the brake on the basis of the specified braking value, measuring the actual torque and the actual speed of the real rotatable body, determining whether the actual speed exceeds a predetermined limit speed, and simulating the motion of the rotatable body on the basis of a torque of the simulated rotatable body. In this way, a possibility for simulating the motion of a rotatable body is provided, which provides at least approximately correct results even for low speeds of the rotatable body.