Drive system for a land craft

摘要

A drive system (DS) for a land craft comprises a machine system (M1, M2) for driving the land craft, the machine system comprising at least a first and a second electric machine (M1, M2) acting on a common drive shaft (S) for driving the land craft, and a control device (PE, PE1, PE2) which is adapted to control the machine system for operating in at least two rotating speed operation ranges (OR1, OR2) with different rotating speeds of the drive shaft (S). The first electric machine (MI) is controlled to operate in both rotating speed operation ranges (OR1, OR2) to provide a first drive torque, and the second electric machine (M2) is controlled to operate in only one of the rotating speed operation ranges (OR1) to provide a second drive torque in addition to the first drive torque.

主权项

1. A drive system (DS) for a land craft, comprising:
a machine system (M1, M2) for driving the land craft, the machine system comprising at least a first and a second electric machine (M1, M2) acting on a common drive shaft (S) for driving the land craft, a control device (PE, PE1, PE2) which is adapted to control the machine system for operating in at least two operation ranges (OR1, OR2), wherein in a first operation range (OR1) the first and second electric machines (M1, M2) are operated to provide each a drive torque to the drive shaft (S), and in a second operation range (OR2) only one of the electric machines (M1) is operated to provide a drive torque to the drive shaft (S), wherein the control device (PE, PE1, PE2) is adapted for operating the machine system (M1, M2) according to a torque-speed relation, wherein the operation ranges (OR1, OR2) are delimited by a threshold curve (TC) between a first threshold (Tqg) indicative of a first torque at a first speed of zero, and a second threshold indicative of a second torque at a second speed (ωg, ng).