Abstract:
The present invention is directed to a control strategy for operating a plurality of prune power sources (101-1 to 101-3) during propulsion, idling and braking and is applicable to large systems such as trucks, ships, cranes and locomotives utilizing diesel engines, gas turbine engines, other types of internal combustion engines, fuel cells or combinations of these that require substantial power and low emissions utilizing multiple power plant combinations The present invention is directed at a general control strategy for a multi- engine systems (101-1, 101-2) where the power systems need not be of the same type or power rating and may even use different fuels The invention is based on a common DC bus (103) electrical architecture so that prime power sources need not be synchronized
Abstract:
The present invention relates generally to regenerative braking methods for a hybrid vehicle such as a hybrid locomotive, which are compatible with optimum management of a large battery pack energy storage system. Four methods for recovering energy from regenerative braking and for transferring this energy to an energy storage systems are disclosed. These methods may also be used with battery operated vehicles.
Abstract:
The present invention is directed to a power control architecture for a vehicle, particularly a locomotive, in which a number of energy sources are connected to a common electrical bus and selectively provide energy to the bus based on the relationship between their respective output voltages and the bus voltage.
Abstract:
The present invention is directed to a hybrid locomotive that can operate in a multitude of operational modes, including a slug operating mode, an energy storage operating mode, an independent operating mode, and a power source operating mode, and/or can provide electrical energy to an external power distribution system, such as a power grid,catenary, and third rail.
Abstract:
A dynamic braking circuit is disclosed that can be operated with stability over both high and low speed regimes. This circuit has the advantage of using fewer components than previous circuits. In addition, when in braking mode, the armature and field currents tend to oppose each other across the main braking switch hence reducing electromechanical stresses when in high current regime. According to a second invention, a dynamic braking circuit is disclosed to implement a "soft" extended braking function with the capability of providing a smoother braking action at high braking effort at little extra cost resulting from the replacement of a contactor by a reverser. The main advantages of this preferred embodiment are that the current generated by the armatures during braking can be controlled independently from the excitation of the field windings at low speeds and that it enables simultaneous self supply, regeneration and dynamic braking.
Abstract:
The present invention is directed to providing control modes for operating a plurality of power sources including energy storage systems and is applicable to large systems such as locomotives. The present invention is directed specifically at providing selectable operating modes for different locomotive speed ranges and work loads. The invention is based on a common DC bus electrical architecture so that prime power sources need not be synchronized. The invention includes multiple-engine locomotives in which the engine systems may be electrically connected in parallel or in series or in combinations of parallel and series to a DC bus.
Abstract:
The present invention is directed to the design of a load-lifting apparatus comprising one or more prime power sources, one or more energy storage systems and a means of regenerative braking. Regenerative energy is recovered when the load-lifting apparatus lowers its load. The elements of the prime power sources, energy storage devices and electrical components may be distributed to provide stability for the load-lifting apparatus. The general power architecture and energy recovery method can be applied to cranes, rubber-tired gantry cranes, overhead cranes, mobile cranes, ship-to-shore cranes, container cranes, rail-mounted gantry cranes, straddle carrier cranes and elevators. In such an architecture, the energy storage system helps alleviate the power rating requirement of the prime power source with respect to the peak power requirement for lifting a load.
Abstract:
Embodiments of the present invention are directed an electrochemical energy storage device, such as a cell or a battery, that includes segmented stackable bus bars for stacking electrodes, the bus bar segments extending a substantial length of an edge of the electrodes to provide proper inter-electrode spacing, substantially uniform electrochemical potential and current density between electrodes, efficient internal heat dissipation and desired electrode structural rigidity, and, optionally, a compression member, separate from the case, to compress the stacked electrodes.
Abstract:
The present invention is directed to a locomotive that includes: (a) a transmission (105) operable to drive a plurality of axles; (b) an electric motor (104) operatively connected to and driving the transmission; (c) an energy storage unit (106) operable to store electrical energy and supply electrical energy to the electric motor; (d) one or more prime movers (102) operable to supply electrical energy to the energy storage unit and electric motor; and (e) a power distribution bus (109) electrically connecting the energy storage unit, prime mover(s), and electric motor. The energy storage unit and/or generator provide electrical energy to the electric motor via the power distribution bus to cause the electric motor to rotate the axles via the transmission.