Hydraulic Dynamometer Torque Control for Vehicle Testing
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Solution Overview
Problem
Existing dynamometer testing methods for motor vehicles are limited in simulating real-life driving conditions, particularly dynamic scenarios, and lack flexibility, with complex and inflexible solutions that do not accurately mimic tire-road interactions and require extensive electrical installations.
Innovation Solution
A method and device using hydraulic dynamometer test units with adjustable torque and rotational speed control, simulating real-life driving conditions by applying torque to vehicle drive shafts based on slip values, allowing for flexible torque distribution and adaptable testing of various vehicle configurations, including four-wheel drive systems, with minimal external energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electric load machines are used for torque control, then vehicle performance testing accuracy is improved, but device complexity and installation requirements increase significantly
Solution Approach 1:
The patent replaces complex electrical load machines with a simpler hydraulic dynamometer system. The hydraulic pump generates hydraulic fluid flow that drives a hydraulic motor connected to the drive shaft, providing torque control through fluid pressure and flow regulation rather than complex electrical systems. This substitution maintains testing accuracy while significantly reducing device complexity and installation requirements.
Solution Approach 2:
The patent employs hydraulic principles throughout the system. A hydraulic pump generates high-pressure fluid flow that is directed to a hydraulic motor on the drive shaft. The hydraulic system provides smooth, controllable torque application through pressure regulation, eliminating the need for complex electrical installations while maintaining precise vehicle performance testing capability.
2Stability of the object's composition
If fixed installation sites are used for testing, then testing stability is improved, but adaptability to different locations and vehicle types decreases
Solution Approach 1:
The hydraulic dynamometer system is designed as a universal testing platform that can accommodate different vehicle types and testing scenarios. The hydraulic pump and motor configuration can be adjusted for various torque requirements, and the system can be deployed at multiple locations rather than requiring fixed installation. This universality provides both stability through standardized testing procedures and adaptability to different vehicles and sites.
Solution Approach 2:
The system incorporates dynamic adjustment capabilities through the hydraulic control system. The hydraulic pump can vary fluid flow pressure and rate to match different vehicle requirements and testing conditions. This dynamic adaptability allows the same equipment to maintain stable, accurate testing across diverse vehicle types and locations without requiring fixed installation.
3Use of energy by moving object
If hydraulic pump units generate hydraulic fluid flow during operation, then energy efficiency is improved, but system complexity increases
Solution Approach 1:
The hydraulic pump units are integrated directly into the dynamometer system and are driven by the vehicle's own motion during testing. As the vehicle's drive shaft rotates the hydraulic motor, it drives the hydraulic pump to generate the necessary fluid flow for torque control. This self-service arrangement eliminates the need for external energy sources, significantly improving energy efficiency while the integrated design keeps system complexity manageable.
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
Enables thorough and accurate testing of vehicles in diverse driving situations, including dynamic conditions, with high precision and flexibility, reducing the risk of transmission system damage and allowing for portable, space-efficient testing setups.
Implementation Method 1
each one of said hydraulic dynamometer test units includes a hydraulic pump unit which generates said hydraulic fluid flow during operation
Implementation Method 2
there is a minimal need for external energy supply
Data Source
AI summary
A method and a device for dynamometer testing of a motor vehicle (1) , having a front end and a rear end and a right side and a left side, as seen in a driving direction, and/or vehicle components, by measuring torque and rotational speed on drive shafts (3LF, 3RF, 3LR, 3RR) of the vehicle, wherein a braking torque is applied to each one of said shafts by individual hydraulic dynamometer test units by throttling hydraulic fluid flows, and wherein said braking torque is adjustable for each individual one of said drive shafts (3LF, 3RF, 3LR, 3RR) such that a resulting individual rotational speed for that shaft corresponds to a virtual vehicle speed when driving the motor vehicle on a road, compensated with a slip value.