Track testing methology
VTI and Autoliv has through collaboration (ALVTI) developed a test system for track testing. It can be used for evaluation of active and passive safety systems.
Productivity, flexibility, reliability and accuracy were all key factors during the development process. The crash surviving capacity of the system makes it useful even in high velocity collisions with another vehicle. Currently, the jointly developed system includes driving robots (DrivR), autonomous balloon cars (TargR) and autonomous pedestrians (PedR).
- DrivR is designed to handle both crash testing and active safety testing and to control vehicles with high precision. When using two driving robots it is for example possible to run vehicle to vehicle side impacts, with two vehicles moving at relatively high velocity, maintaining high precision. During development and testing of active safety systems such as stereo vision, can for example an intersection scenario test with synchronized moving test objects be performed using a vehicle controlled by a driving robot and an autonomous balloon car.
- TargR uses the same technology as DrivR for propulsion and control. It consist of a inflatable target mounted on a low cart that runs along a flexibel rail. The rail is easily mounted on the test track to create the desired scenario.
- PedR is similar to TargR. It uses a configuration where the target is suspende from elevated rail. Both a pedestrian target and a two wheeler. All the targets have been designed to minimize damage on the striking vehicle and to the target itself.
The capacity for e.g pedestrian detection tests is about 15 tests per hour, keeping high precision. The developed test control system also gives a unique possibility to run evaluation testing of active and passive safety systems in one single test, evaluating the total safety of the integrated active and passive safety systems. This is enabled through a driving robot design that is robust enough to handle the crash, and still small enough to be able to run the tests with fully instrumented crash test dummies, if desired.
Performance and specification
- Each test runs according to a predefined scenario programed into the ECU. The control loop executes at 100 Hz.
- The accuracy for a coordinated collision between two vehicles is equal to or less than 5 ms.
- The system survives a crash up to 100 G
- The system is easy to install, approx. 4-8 hours.
- The system does not affect normal driving i.e. no bulky hardware on the steering wheel etc. (except pneumatic actuator on the brake pedal).
- The system does not change the vehicles crash performance/passive safety properties.