Vehicle Securing on Roller Test Stands via Automatic Wheel Braking
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Solution Overview
Problem
Vehicles with automated parking brakes can be accidentally pushed out of roller test stands during testing, posing a risk to nearby individuals due to the rapid build-up of braking torque and driving effect, necessitating repositioning and safety concerns.
Innovation Solution
Implementing sensors to detect when a vehicle is on a roller test stand and automatically activating the wheel brake of at least one wheel outside the stand after applying the parking brake, using an actuator to build up braking torque, ensuring the vehicle cannot be pushed out by controlling the service brake system via a control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the parking brake is applied on the roller test stand, then the braking torque is built up quickly, but the vehicle can be pushed out of the test stand causing safety hazards
Solution Approach 1:
The invention applies preliminary anti-action by activating wheel brakes on wheels outside the roller test stand before the parking brake is fully applied. This preventive measure creates opposing braking forces that counteract the forward pushing effect of the parking brake, thereby preventing the vehicle from being pushed out of the test stand while maintaining quick braking torque build-up.
Solution Approach 2:
The control unit activates the wheel brakes on wheels outside the roller test stand in advance, before the parking brake completes its braking torque build-up. This preliminary action ensures that securing forces are already in place to prevent vehicle movement, addressing the reliability issue before the harmful effect can occur.
2Reliability
If sensors and control systems are added to prevent vehicle movement, then safety is improved, but device complexity increases
Solution Approach 1:
The invention utilizes the existing sensor system and control unit of the vehicle's brake system, making these components serve multiple functions. The sensors detect both the vehicle's presence on the roller test stand and the activation state of the parking brake, while the control unit manages both the parking brake and the additional wheel brakes, thereby reducing the need for separate dedicated components.
Solution Approach 2:
The control unit automatically determines when the vehicle is on the roller test stand based on sensor signals and autonomously activates the wheel brakes without requiring additional manual intervention or complex external control systems. The system serves itself by using its own sensors and control capabilities to implement the safety function.
Data Source
Figure 1
AI summary
The invention relates to a method for securing a vehicle (1), the wheels (5c, 5d) on the axle of said vehicle being arranged on a test stand (2) for preventing unintentional movement from the test stand (2) when testing the parking brake. According to the invention, in order to avoid endangering people who are close to the vehicle, a sensor is used to determine whether the vehicle (1) is located on a test stand (2) and if this is the case, brake torque is automatically applied to a wheel brake of at least one wheel (5a, 5b) located outside of the test stand (2), once an operating element of the parking brake is actuated