Roller Dynamometer Reversing Device for Vehicle Exit
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Solution Overview
Problem
Vehicles with certain types of drivetrain configurations, especially those with electronic slip control, face difficulties in exiting a roller dynamometer due to the rollers' freely rotating state, which can prevent the vehicle from being driven out, especially when testing rear-wheel or front-wheel brakes.
Innovation Solution
Implementing a reversing device that reverses the direction of rotation of at least one roller when the vehicle is leaving the test stand, utilizing existing roller dynamometer components and control systems to facilitate easier exit without the need for expensive disc brakes or complex mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rollers are freely rotatable during pauses between brake tests, then the wheels can easily spin and the vehicle can be driven out, but vehicles with electronic slip control cannot develop sufficient driving force to exit the test stand
Solution Approach 1:
The patent applies the inversion principle by reversing the direction of rotation of the rollers instead of keeping them freely rotatable or using expensive disc brakes. This reverse rotation creates controlled resistance that allows vehicles with slip control systems to develop sufficient driving force while still enabling easy exit from the test stand.
Solution Approach 2:
The patent changes the operational parameter of the rollers from a stationary or freely rotating state to a reversely rotating state. This parameter change enables the rollers to provide controlled resistance during vehicle exit, resolving the contradiction between ease of operation and reliability for vehicles with electronic slip control.
2Stability of the object's composition
If expensive disc brakes are used to hold the rollers, then the rollers can be held stationary, but the cost of the device increases significantly
Solution Approach 1:
The patent replaces expensive disc brakes with a simpler, more cost-effective reversing device that changes the direction of roller rotation. This solution achieves the same functional outcome (controlling roller movement during exit) at a fraction of the cost, aligning with the principle of using cheaper alternatives when possible.
Solution Approach 2:
Instead of using disc brakes to prevent roller rotation, the invention uses a reversing device to actively rotate the rollers in the opposite direction. This inverted approach achieves stable roller control during exit without the high cost of disc brake systems.
3Measurement precision
If the rollers are driven at higher rotational speed during brake testing, then accurate brake values can be obtained, but the vehicle cannot be driven out during drive phases
Solution Approach 1:
The patent applies dynamics by making the roller rotation state changeable - during brake testing the rollers are driven at controlled speeds for accurate measurement, and during exit the rollers are reversely rotated to enable vehicle movement. This dynamic adjustment of roller behavior resolves the contradiction between measurement precision and ease of operation.
Solution Approach 2:
The patent implements periodic action by alternating between different roller operation modes: driven rotation during brake testing for accurate measurement, and reverse rotation during exit phases. This periodic switching between operational states allows the system to achieve both measurement precision and ease of operation at different times in the test cycle.
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 solution allows for effortless and jerk-free exit from the roller dynamometer in all vehicles, including those with slip control, by providing increased rotational resistance and leveraging the higher forward speed generated by the vehicle's engine, making the process automatic and cost-effective.
Implementation Method 1
reverses the direction of rotation of at least one of the rollers when the vehicle leaves the roller test stand... providing increased rotational resistance
Data Source
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AI summary
The dynamometer has two pairs of rollers (80L, 82L) for examination of axles of wheel brakes of a vehicle and attached to drive motors i.e. three-phase electromotors, to rotate one of pairs of the rollers in a given rotation direction and both the pairs of rollers in the equal rotation direction. A superordinate computer and contactors reverse the rotation direction for exit of the vehicle from the dynamometer. The computer and sensors evaluate movement of a roller tappet (102L) and determine the rotation direction and rotation speed change of the rollers. An independent claim is also included for a method for operating a roller dynamometer.