CarMaker/Cruise - The integrated solution for hybrid and fuel consumption optimization
IPG Automotive and AVL have have tightly interfaced the detailed powertrain simulation tool, AVL CRUISE, to the driving dynamics simulation platform, CarMaker. The solution is fully available and enables for the first time to simulate the multi-dimensional losses of individual vehicle components in realistic driving situations. CarMaker/CRUISE is best suited to testing the driving dynamics characteristics of hybrid vehicles which result from the complex interaction of components and systems.
The integrated solution creates a unique continuity accross multiple sectors. Engineers in driving dynamics or powertrain now have a common platform at their disposal to exchange their development status or optimization. They can work with their familiar tool environment (CarMaker or CRUISE) and bring the developed models, parameters and test cases together in CarMaker/CRUISE for integration tasks.
Full analysis of power losses during realistic drive cycles
- Power losses analysis of tires in lateral and longitudinal dynamics
CarMaker/CRUISE raises the potential for an efficient use of energy considering both security and comfort at the same time. Lifelike driving maneuvers enable the establishment of a balance sheet of the power loss for all subsystems like suspension, steering, brakes, tires, masses and aerodynamics as well as motor, gearbox, differential, auxiliary equipment and the battery. Thus the interaction of components can be detected and powertrain systems, as well as driving dynamics systems can be adjusted relative to one another in the complete vehicle be in in longitudinal, lateral or vertical dynamics cycles.
- Increase in fuel consumption by reduction of the curve radius
CarMaker/CRUISE is suitable for office applications as well as Hardware-in-the-Loop simulation (HIL) on test benches for controllers, motor or powertrain. Thanks to the sophisticated CarMaker models for driver, traffic and 3D-roads, maneuvers on the handling course can be recreated reproducibly just as well as urban drives, interurban drives or motorway drives to which any driving situation can be added with IPGTraffic. Such a test methodology based on maneuvers and situations outclasses the possibilities offered by longitudinal drive cycles only (i.e. NEFZ) as they are usually driven on chassis dynamometer test benches. According to the reality, the multidimensional losses of the individual components can be represented additionally in the longitudinal, lateral or vertical directions. This allows the precise analysis of how the various subsystems contribute to the increase in fuel consumption in curves, slopes or in a stop&go traffic situation.
Testing of hybrid vehicles based on maneuvers and situations
CarMaker/CRUISE is also best suited for the analysis of driving dynamics for hybrid vehicles. The functionalities specific to hybrid vehicles like recuperation, boosting, automatisation of start/stop and the driving with solely electric energy create important interactions from the powertrain on the driving dynamics. This interaction can be tested comprehensively with CarMaker/CRUISE to analyse the functionalities of assistance, security, stability and performance in the complete vehicle.
The full integration of CRUISE enables the integration at the push of a button hybrid powertrains in the complete vehicle model of CarMaker. The closed loop of the hybrid vehicle, driver and road can thus be tested comprehensively during virtual tests. The flexible maneuver regulation of CarMaker enables the user to reconstruct any Open-Loop or Closed-Loop maneuvers in order to analyse the behavior of the hybrid vehicle by braking, curves, start and
comfort.
- Starting performance/traction
- Power on steering (boost mode)
- μ-split braking
- μ-split corner braking
- μ-low braking
- Steady State Cornering (charge mode)
A further possibility to use CarMaker/CRUISE is to optimize the operation strategy of driver assistance systems regarding the consumption. It could be possible to adjust the operation strategy of a hybrid vehicle combined with an ACC system to increase the energy efficiency of the vehicle. To analyse such interactions, the user creates driving situations with IPGTraffic which specific configuration in regard to vehicle, driver, road and traffic can be reproduced exactly. The user meets no limit concerning the number of traffic items or the length of his single-lane or multi-lane.
Open Model Integration Platform
CarMaker's attribute of being an open integration platform shows all its effect in the solution CarMaker/CRUISE. The models and functionalities of CRUISE are fully integrated in CarMaker. The parametrization of the CRUISE and CarMaker models takes place quickly and easily. For first concept studies it is possible to generate parametrization at the push of a button with the generator of parameters. Parameters from other systems can also be integrated.
- The choice of powertrain models from CRUISE is done as normal through CarMaker's ModelManager.
- The user has access to the functionality and models of CRUISE through CarMaker's GUI without having to start CRUISE.
- As soon as the user has chosen his model, CRUISE is automatically linked to the APO communication service of CarMaker. Thus the energy flow in the powertrain can be shown online through the functionality "Energy Flow Graphic".
Modeling of powertrain in CRUISE
- Any powertrain concept can be modeled, extended or changed quickly and easily. To this end the user has access to a comprehensive component database.
- The component models can be allocated to different levels. Thus it is possible to activate a hybrid component with a click next to a normal combustion engine.
Continuous application through the development process
CarMaker/CRUISE can be used continuously throughout the concept and software developement as Model and Software-in-the-Loop simulation. It also supports the Hardware-in-the-Loop testing with the same models, maneuvers and situations on ECU test benches for ECU, components or systems.
- Continuous application of CarMaker/CRUISE by the powertrain development
