Master Thesis: Design of an active traction control WL Electromobility

Suitable background
Relevant education in Electrical engineering, Mechatronics, Software engineering, Electronics or similar.

Background of thesis project

A wheel loader can in certain conditions get into an oscillative pitch movement. That is uncomfortable and risks spilling bucket load. The traditional way of solving this, is by what Volvo calls boom suspension system. That system is used to smoothen the ride for the driver, by adding flexibility between the loader body and the lifting unit.

In a wheel loader with electric propulsion system, the response time and precision should be enough to be able to dampen the pitch movement by a modulation of tractive force. We need your help to achieve it!

Description of thesis work
Design of an active traction control to aid the boom suspension system in an electrical wheel loader.

The purpose of this study will be to design, simulate and test, a complimentary active traction control to aid the boom suspension system for our electrical machines.

The thesis will start by studying the current hydro-mechanical system, in order to understand the system and machine behavior. The next step would be to design a new system, where the damping motion is actively controlled by modulate the traction force, instead of relying on passive damping with accumulators in the hydraulic system.

In order to develop the new system, you must simulate, and test the new damping system in our complete machine model. The goal is then to test it in an actual wheel loader.

The thesis will be supervised by Volvo CE and the work will mainly be conducted in Eskilstuna. We prefer if two students apply and preform this thesis together. We believe you are focused on control technology and/or driveline systems.

Proposed content
  • Detailed study of the current hydro mechanical solution.
  • Literature study of previous work of active dampening.
  • The study shall produce a model using Matlab Simulink.
  • Test the new system in a wheel loader.
  • Analysis and comparison of simulated and real-world test results.
Thesis Level: Master

Language: English/Swedish

Starting date: Q1 2022

Number of students: Two

Tutor
Patrik Stener
System Next Generation Large WL
Telephone: +46 16 541 89 96

Johan Lokrantz
System Next Generation Large WL
Telephone: +46 16 541 88 53

The Volvo Group drives prosperity through transport solutions, offering trucks, buses, construction equipment, power solutions for marine and industrial applications, financing and services that increase our customers’ uptime and productivity. Founded in 1927, the Volvo Group is committed to shaping the future landscape of sustainable transport and infrastructure solutions. Countless career opportunities are offered across the group’s leading brands and entities that share a culture of Trust, Passion, High Performance, Change and Customer Success. 
www.volvogroup.com/career. 

Volvo Construction Equipment is a global company driven by passion, curiosity and by our purpose: to build the world we want to live in. We believe that only through imagination and teamwork can we develop a world that is cleaner, smarter and more connected. Our company culture reflects this belief through the care and trust it places in our customers, employees and suppliers. People are at the heart of our business. It is through our strong network of talented, enquiring and innovative minds that we have been able to pave the way towards a more sustainable future. The global construction industry is our arena and our employees are our greatest assets.

We can only continue to stand out as industry leaders through the people driving us forwards. Come be a part of our team and help us build tomorrow.

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