Roller Dynamometer Cornering Simulation via Correction Parameter
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Solution Overview
Problem
Current roller dynamometer tests fail to accurately simulate the additional resistances that occur during vehicle cornering, which are crucial for realistic fuel consumption and emission measurements, due to the limitations of conventional 4×2 or 2×1 dynamometers that cannot individually control wheel rotation speeds.
Innovation Solution
A method that incorporates additional resistance forces during cornering as a correction parameter, allowing for a more realistic simulation of cornering resistances on existing 4×2 or 2×1 roller dynamometers by adding a cumulative resistance force or using a mathematical correction factor to the conventional resistance force, which can be derived from real experiments or physical models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional 4×2 or 2×1 roller dynamometer is used, then the device complexity and installation cost are reduced, but the ability to simulate cornering resistances is lost
Solution Approach 1:
A correction parameter acts as an intermediary that translates cornering resistance effects into equivalent longitudinal resistance forces. This mediator allows a simplified 4×2 or 2×1 dynamometer to simulate cornering conditions by adding the correction parameter to the basic resistance force, achieving accurate cornering simulation without requiring complex 4×4 configuration with individual wheel control
Solution Approach 2:
The invention transforms cornering resistance (which involves lateral forces and individual wheel speeds) into a parameter change in the longitudinal resistance force through the correction parameter. By calculating the correction parameter based on vehicle speed, curve radius, and mass distribution, the system adapts the resistance force parameter to reflect cornering conditions, enabling accurate simulation on simplified dynamometers
2Measurement precision
If a 4×4 roller dynamometer with individual wheel control is used, then the simulation accuracy for cornering is improved, but the device complexity and installation cost increase significantly
Solution Approach 1:
The invention extracts the essential cornering resistance effects from the complex individual wheel control mechanism and consolidates them into a single correction parameter. By taking out only the necessary resistance force information from the complex 4×4 system and representing it through the correction parameter, the invention achieves the same simulation accuracy on simpler 4×2 or 2×1 dynamometers without requiring individual wheel control
Solution Approach 2:
The invention merges multiple cornering resistance components (lateral slippage, differential losses, power steering losses) into a single correction parameter that modifies the longitudinal resistance force. This combining approach consolidates the effects of individual wheel speed differences and lateral forces into one unified parameter, simplifying the control system while maintaining simulation accuracy
Data Source
AI summary
A method for simulating cornering of a vehicle 2 being tested on a roller dynamometer 1 to determine a measured variable 13, wherein the vehicle 2 being tested on the roller dynamometer 1 is operated as though driving straight ahead, and to simulate cornering the additional resistance forces of cornering are taken into account in the form of a correction parameter 9.