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To make everything work together without conflicts or instability, Poclain Hydraulics needed to define different levels of control. The higher level of control helps ensure energy management by splitting power between both systems, while the intermediate level helps ensure each subsystem will provide the required power every time. The lower level manages the functional limitations of the systems. All of the basic controls were made by importing the signal and control library directly from AMESim.

Simulation Helps Manufacturer Improve HST Design, Fig. 4

To improve the system by choosing the best components and the best way to control them, the analysis consists of observing the energy that transits into the system during deceleration and acceleration. This enables Poclain engineers to track the lost or non-recovered energy. The main criteria is the fuel consumption on a given duty cycle and the return on investment. Brake wear also can be studied with this analysis.

“The online strategy is validated through AMESim,” says Brunel. “The main difficulty is to find a robust strategy, whatever the duty cycle. The strategy may also have to be adapted when the sizing of the system is modified.”

Utilizing systems approach to achieve high-value solutions

Model-based system engineering is an exceptional way to decrease development costs on existing concepts and to enable more innovative ideas, as is the case at Poclain Hydraulics. It also enables people to work together more effectively, from the component designer to the system designer to the control software programmer.

Simulation Helps Manufacturer Improve HST Design, Fig. 5

Simulation Helps Manufacturer Improve HST Design, Fig. 6

According to Brunel, the model-based system engineering approach is also an excellent way to work collaboratively with customers. “The degree of collaboration varies,” he explains. “Some customers state their precise specifications and ask Poclain Hydraulics for the right component to handle their needs. The company’s expertise in machine constraints and use of AMESim are critical factors in its ability to deliver complete, high-value solutions, as is its knowledge of sustainable systems.”

Among offerings for sustainable mobility, Poclain Hydraulics’ truck assistance solution AddiDrive Assist and hybrid system CleanStart are already on the market—both taking advantage of the company’s capability to design dedicated systems for its customers.

“Sustainability is becoming more and more important to the market,” says Yannick Seeleuthner, Poclain’s group marketing manager. “This is not something new for Poclain Hydraulics, because it has always been one of our key values. Hydraulic transmissions have always been among the most energy efficient for mobile applications. Meanwhile, our products are 100% recyclable, and we are implementing solutions in our factories to further minimize our environmental footprint. Reducing fuel consumption for our customers’ machines is a key driver in our design process.”

Bruce Pilgrim is Senior Marketing Writer at Siemens PLM Software, Milford, Ohio.

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