Volkswagen’s chief executive Matthias Mueller named his new management team on Thursday, including the replacement for the group’s research and development chief who left earlier this month as a result of the diesel emissions scandal. “These structural changes speed up the decision-making process, reduce complexity and increase efficiency,” Mueller said in a statement. The new appointments are mostly internal, although Ulrich Eichhorn returns to become R&D chief after three years at the German automobile industry association.