Patent ID: 7532960
Filing Date: 2009-05-12
Classification: B60L,Y02T,Y10S

Abstract:
1. An energy management system for use with a hybrid energy off highway vehicle system, said off highway vehicle system including a vehicle having a primary energy source, a power converter driven by the primary energy source providing primary electric power, a traction bus coupled to the power converter and carrying the primary electric power, a secondary energy storage subsystem, a traction drive connected to the traction bus, said traction drive having a motoring mode in which the traction drive is responsive to the primary electric power for propelling the off highway vehicle, said traction drive having a dynamic braking mode of operation wherein said traction drive generates dynamic braking electrical energy, the energy management system comprising: an energy management processor determining a power storage parameter and a power transfer parameter, and an energy storage system connected to the traction bus and being responsive to the energy management processor, said energy storage system selectively storing electrical energy available from the traction bus in the secondary energy storage subsystem as a function of the power storage parameter, wherein the energy storage system is responsive to the power storage parameter for determining when to store electrical energy from the traction bus, and selectively supplying secondary electric power from the secondary energy storage subsystem to the traction bus as a function of the power transfer parameter, wherein the secondary energy storage subsystem is responsive to the power transfer parameter for determining when to supply secondary electric power to the traction bus, and wherein the traction drive is responsive to the secondary electric power.