Chassis Dynamometer Actuator for Realistic Vehicle Acceleration Simulation
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Solution Overview
Problem
Current vehicle test benches fail to simulate the vehicle's acceleration and braking behavior realistically, leading to a subjective experience that differs from real driving conditions, as they cannot accurately replicate the dynamic movements and forces experienced on the road.
Innovation Solution
A method where the rotational movement of the vehicle's wheel or drive train is measured to determine longitudinal acceleration, which is then used to control a linear motor actuator in real-time, applying forces that simulate the subjective experience of accelerating, braking, and shifting gears, utilizing a high-pass filter to filter out low-frequency components and adjust the actuator's deflection for a more realistic and reduced translation path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the vehicle is fixed on the test bench with respect to translational movements, then the mechanical connection to loading machines is stable, but the vehicle cannot perform the same movements as on the road and the subjective driving experience is lost
Solution Approach 1:
The test bench transitions from a static fixed configuration to a dynamic system where the vehicle can undergo controlled translational movements. The actuator enables the vehicle to accelerate and decelerate along the longitudinal axis, replicating real driving dynamics while maintaining mechanical connection stability through the controlled movement capability.
2Adaptability or versatility
If the entire field of grooves with vehicle and loading machines is moved to simulate acceleration through inclination, then the subjective driving experience is improved, but the large mass makes this impossible to implement
Solution Approach 1:
Instead of moving the entire test bench structure (field of grooves with vehicle and loading machines), the solution segments the movement function and applies it only to the vehicle portion. The actuator is specifically coupled to the vehicle, enabling selective acceleration of the vehicle mass without requiring movement of the heavy loading machines and track infrastructure.
Solution Approach 2:
The solution replaces the mechanical gravity-based inclination system (which would require moving the entire structure) with an actuator-based force application system. The actuator directly applies longitudinal forces to the vehicle, substituting the need for large-scale mechanical movement with a more efficient force-coupling mechanism.
3Device complexity
If predetermined values for displacement or force are used with translational actuators, then the control is simplified, but only coordination of test load and drive torque is provided without realistic acceleration simulation
Solution Approach 1:
The system implements feedback control where the actuator's acceleration output is continuously monitored and used to adjust control signals. The measured acceleration from the vehicle is fed back to the control device, which compares it with the desired acceleration profile and adjusts the actuator force accordingly, enabling realistic acceleration simulation through closed-loop control.
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 allows for a realistic simulation of vehicle behavior on the test bench, closely mimicking real driving conditions, enhancing the subjective experience and enabling effective vehicle calibration by accurately replicating the physical effects on the wheel or drive train, thus allowing for online adjustments to the vehicle model and improved calibration.
Implementation Method 1
an actuator (2) for transmitting a longitudinal force (FL) to the vehicle (1) and for accelerating the vehicle (1) in a longitudinal direction, so that the vehicle (1) covers a translation path
Implementation Method 2
The determined longitudinal acceleration (a) is converted or converted into a filtered acceleration (ã), which corresponds to a subjective acceleration, by a high-pass filter (5)
Data Source
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AI summary
The invention relates to a chassis dynamometer and to a method for simulating the behavior of the vehicle in a chassis dynamometer, comprising an actuator for transferring a longitudinal force to the vehicle, a rotational movement carried out by a wheel or a drive train of the vehicle being measured, a corresponding longitudinal acceleration being determined from the measured rotational movement and the actuator being controlled in accordance with the determined longitudinal acceleration based on the measurement.