Mobile Vehicle Tests
Mobile Vehicle Tests
Mobile test driving is a key part of the vehicle development process and essential for gaining knowledge about a newly developed vehicle. The aim is to measure and assess the interaction of a vehicle's components under real-world conditions. This is carried out on test sites or on public roads. The complete vehicle test method including endurance testing and vehicle durability testing enable engineers to observe and analyze the behavior of vehicles under realistic driving situations. Important measurement tasks are the validation of the vehicle durability, the assessment of driving comfort, driving dynamics, noise and vibrations. These vehicles are equipped with a wide range of measurement technology. The equipment of the test vehicles varies depending on the desired test values or the task at hand. The trend from combustion engines to electric drives has led to additional challenges. As a result, additional sensors and data buses are required to obtain a complete picture of the development status of the vehicle.
Core to these tests is a data logger with a measuring amplifier and interfaces to the vehicle bus, which synchronously records the data in real time. The data is then stored in this mobile data logger for later analysis. Endurance testing for automobiles often extends over extremely long measurement cycles and therefore require online analysis to reduce the amount of measurement data.
The most important tests in the mobile vehicle test are:
Driving Dynamics Evaluation
During a vehicle dynamics evaluation, the forces and their effects on the vehicle are measured. Wheel force and torque transducers are used to record precise measurement data to enable a thorough investigation of longitudinal, lateral and vertical dynamics. The key aspects of vehicle dynamics - acceleration, braking, steering and stability - are crucial for safety and efficiency. By studying wheel loads, tire characteristics and the interaction between vehicle and road surface, engineers look to perfect the interaction between man, machine and environment. Driving dynamics is therefore a key element in the development of modern vehicles, which should not only be powerful and energy-efficient, but also safe and comfortable for the user.
Brake Tests
The brake is a safety-relevant component in every car. Therefore, checking their performance and reliability is of crucial importance. Brake tests are carried out specifically to evaluate the performance of braking systems, ensuring that a vehicle's brakes work effectively and reliably, especially in dangerous situations. In addition, this series of tests includes the analysis of the friction coefficients of the tires, especially in relation to the braking distance. This ensures that vehicles can achieve adequate deceleration in emergency situations. The results of these tests play a crucial role in ensuring the safety of vehicles, their passengers and other participants on the road.
Road Load Data Acquisition (RLDA)
Road Load Data Acquisition (RLDA) is carried out in order to record real operational loads acting on a vehicle. This data is crucial for engineers to assess and optimize the service life and durability of vehicle components. The data also helps to simulate laboratory and bench tests to replicate real-world conditions. This process involves collecting data on the forces and torques that act on a vehicle's components during normal operating conditions. All this data is used to improve the vehicle durability.
Logging Fieldbuses in Vehicles
Bus systems are a principal component of modern vehicle communication. Bus systems in the vehicle are used to communicate between the various vehicle components and as cars have become more advanced these fieldbuses and their interactions have become extremely important. Correspondingly, the integration of the bus systems in measuring and testing tasks, as well as in automation, is becoming increasingly important. The correct logging of these systems is essential to ensure the safety and efficiency of modern vehicles.
Rugged Measurements for Harsh Environments
During these mobile tests, the vehicles are operated at their absolute maximum load. This ensures that the vehicles are tested for their capabilities even in extreme situations. The measurement technology must be designed in such a way that it can withstand the extreme requirements and conditions of all the tests to which it is exposed. Special robustness is required here to ensure that the measurement technology delivers precise evaluations even under the harshest conditions. The IP67 and IP68 protection classes and the MIL standard play a particularly important role here.
Vehicle Endurance Tests
One of the vehicle endurance tests' aims is to check a vehicle's durability and reliability. Vehicle data loggers are used to continuously collect data during these tests, providing valuable insights into performance and potential weaknesses. This approach ensures that the vehicle meets the high demands of the industry and consumers in terms of durability and reliability.
Testing of ADAS and AD Systems
ADAS stands for "Advanced Driver Assistance Systems". These systems comprise various technologies and functions in modern vehicles that improve driver safety and comfort. Examples of ADAS functions include adaptive cruise control, lane departure warning, automatic emergency braking and parking assistance. The next stage is autonomous driving (AD Autonomous Driving).
The testing of these assistance systems is necessary to ensure the functionality and safety of these ADAS and AD systems. Above all, the relevant safety standards and legal requirements for homologation must be met. This can be done in the laboratory and on the road to evaluate the performance and reaction of the systems in different situations.
Pass-by Noise Measurement
Vehicle pass-by measurement refers to the recording of the sound level and acoustic characteristics of a vehicle as it passes a certain point. This type of measurement can be carried out in different contexts and for different purposes, such as vehicle testing, quality control and certification.