An energy management system for use with a hybrid energy off highway
vehicle. The off highway vehicle includes a primary energy source and a
power converter driven by the primary energy source for providing primary
electric power. A traction bus is coupled to the power converter and
carries the primary electric power. A traction drive is connected to the
traction bus. The traction drive has a motoring mode in which the
traction drive is responsive to the primary electric power for propelling
the off highway vehicle. The traction drive has a dynamic braking mode of
operation wherein said traction drive generates dynamic braking
electrical energy. The energy management system includes an energy
management processor for determining a power storage parameter and a
power transfer parameter. An energy storage system is connected to the
traction bus and is responsive to the energy management processor. The
energy storage system selectively stores electrical energy as a function
of the power storage parameter and selectively supplying secondary
electric power from the stored electrical energy to the traction bus as a
function of the power transfer parameter.