Abstract
The Laboratory of Automotive Development Bingen (LAB) of the University of Applied Sciences (UAS) Bingen uses various test benches for investigations on braking, tyre and suspension systems. The aim of the test rig development is creating a cost-efficient tool for the automotive development and research. One core feature is the accomplishment of on-road test manoeuvres in the lab with a quarter car driving dynamics test-stand (VERITA). The opportunity of a link with the simulation tool Carmaker from IPG represents a costefficient tool for hard- and software-in-the-loop investigations. Early in the design process, this tool can be enhanced by means of a driving simulator from the University of Applied Sciences Bocholt for an impression of the future car behaviour including the perception of human drivers with realistic feedback. With VERITA, a platform that enables the simulation of realistic 3-dimensional driving dynamics has been created. Manoeuvres like the elk test, ISO lane change or steady state skid pad tests carried out with the future brake and suspension system on the test rig deliver results and benchmarks in an early state of development before the final car is built for testing. Hard- and software-in-the-loop tests for the quarter vehicle can be conducted in combination with residual vehicle simulation at the computer. Complex driver assistance systems like ABS and ESP can be tested under driving conditions along with special manoeuvres.
This paper presents the results of selected manoeuvres, such as the energy demand of a hydraulic brake system with an electrically actuated smart booster (SMHB) and a selfreinforcing electromechanical brake (EWB). The tests show, on the one hand, the difference between conventional brake tests with single manoeuvres like single square wave and sine wave excitation and the ECE R15 cycle, on the other hand. For the full ECE R15 cycle CO2- emissions of 10 g with the SMHB and 37g with the EWB were determined by using a diesel engine. By application of testing methods using test bench experiments, the influence of every component of the full vehicle can be evaluated and major influences on the energy efficiency can be found - leading to CO2 efficiency in an early state of the car development process.
Keywords: Driving Dynamic Test-standing, Hardware-in-the-loop simulation, CO2- emission, brake-by-wire, ECE-cycle, elk test