HORIBA pushes boundaries for altitude simulation

March 22, 2018


HORIBA, a leading supplier for emission measurement and automotive test systems, is launching an extension for its simulation system MEDAS (Multi-Function Efficient Dynamic Altitude Simulation), enhancing the adjustable temperature range and altitude settings. MEDAS performs vacuum and overpressure simulations and can reach a maximum mass flow of 1,200 kilograms per hour. With the new specifications, customers can now also simulate altitudes on standard test benches ranging from sea level up to 5000 meters. MEDAS offers the possibility to control temperatures from -15 to 40 degrees Celsius and a relative humidity from 10 to 80 percent over the complete altitude simulation range. The extended simulation options provide a more detailed engineering environment for current combustion engine concepts as well as performance and emission requirements.  These tests can be carried out on all common test benches (engine, transmission, vehicle).

As new directives require automotive homologation at different elevations to depict reality and comply with recent standards for actual driving conditions, simulation tools need to become more and more sophisticated. HORIBA has now extended its applications for the altitude simulator MEDAS for improved measurement accuracy while avoiding complexity and greater resource consumption. MEDAS is especially suitable for dynamic and highly accurate testing and offers several simulation options for Road-to-Rig and test cell level verification. Customers benefit from a wide range of simulation options for test drives under real conditions as well as globally consistent results at different R&D locations with geographically divergent conditions.

The applications of MEDAS include engine endurance tests and thermal management tests as well as emission tests such as Real Driving Emission (RDE) tests. The system can be integrated into test bench automation via standard interfaces, allowing control of altitude parameters such as pressure, temperature, humidity and mass flow. In addition, manual operation can be carried out via a user-friendly interactive touch screen, which users can also use as a standalone unit for simulation monitoring.

 “MEDAS is an innovative and energy efficient altitude simulator. As it consumes fewer resources in comparison to a climatic chamber, it provides our customers with a cost-efficient solution for their R&D needs,” explains Javier Gómez, Product Manager Conditioning, Altitude Simulation at HORIBA Europe. “MEDAS takes up less space compared to other altitude simulation systems and is therefore more flexible and easier to integrate into different types of test cells.”

Since MEDAS can simulate almost any environmental condition, it enables the testing of a wide range of motor control parameters and designs. In real altitude tests, ambient conditions such as pressure, temperature and humidity naturally cannot be controlled and can change per day or even per hour. MEDAS, on the other hand, offers stable conditions at the engine intake and outlet, thus allowing reliable results during engine calibration.

“As the test conditions can be controlled in detail with MEDAS, the system is suitable for any RDE comparative test on the test bench. Tests can be repeated as often as necessary, at any desired location and at any desired time of the year,” Gomez continues. “With MEDAS, reliable test results are no longer impaired by inconsistent ambient conditions. Since any altitude can be simulated in the HORIBA test cell and endurance tests can be carried out under different altitude conditions, MEDAS significantly reduces the costs of our customers. At the same time, the system delivers more detailed results and reduces the time and effort required." 


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