Battery-powered all-electric locomotive and related locomotive and train configurations
First Claim
1. A locomotive comprising:
- a first locomotive platform carrying no internal combustion engine on board;
a battery assembly including strings of batteries wherein each said string has batteries connected in series;
a plurality of traction motors powered exclusively by the battery assembly to drive the first locomotive platform, the plurality of traction motors receiving no power supplied from any power source external to the locomotive during operation;
a DC bus coupling the battery assembly to the plurality of traction motors;
a battery management system comprising a plurality of BMS units, each said BMS unit comprising a microcontroller or microprocessor, a charge equalization circuit comprising a bi-directional DC-DC converter operatively connecting to a temporary buffer for battery equalization, and at least one temperature sensor, and each said BMS unit being operatively connected with one of the strings of batteries and configured to;
(a) measure electrical parameters including voltage of said string of batteries,(b) monitor temperatures of said string of batteries, and(c) equalize charges among the batteries of said string to maintain a desired state of charge (SOC) and depth of discharge (DOD) for each battery; and
a motor control circuitry in cooperation with the battery management system to draw currents, within throttle-dependent limits, from the battery assembly to drive the plurality of traction motors.
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Accused Products
Abstract
Designs for a battery-powered, all-electric locomotive and related locomotive and train configurations are disclosed. In one embodiment, a locomotive may be driven by a plurality of traction motors powered exclusively by a battery assembly which preferably comprises rechargeable batteries or other energy storage devices. The locomotive carries no internal combustion engine on board and receives no power during operation from any power source external to the locomotive. A battery management system monitors and equalizes the batteries to maintain a desired state of charge (SOC) and depth of discharge (DOD) for each battery. A brake system may be configured to prioritize a regenerative braking mechanism over an air braking mechanism so that substantial brake energy can be recovered to recharge the battery assembly. Many locomotive or train configurations involving battery-powered or battery-toting locomotive(s) may be implemented, including the combination of a battery assembly and a diesel-electric engine on separate locomotive platforms.
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Citations
18 Claims
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1. A locomotive comprising:
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a first locomotive platform carrying no internal combustion engine on board; a battery assembly including strings of batteries wherein each said string has batteries connected in series; a plurality of traction motors powered exclusively by the battery assembly to drive the first locomotive platform, the plurality of traction motors receiving no power supplied from any power source external to the locomotive during operation; a DC bus coupling the battery assembly to the plurality of traction motors; a battery management system comprising a plurality of BMS units, each said BMS unit comprising a microcontroller or microprocessor, a charge equalization circuit comprising a bi-directional DC-DC converter operatively connecting to a temporary buffer for battery equalization, and at least one temperature sensor, and each said BMS unit being operatively connected with one of the strings of batteries and configured to; (a) measure electrical parameters including voltage of said string of batteries, (b) monitor temperatures of said string of batteries, and (c) equalize charges among the batteries of said string to maintain a desired state of charge (SOC) and depth of discharge (DOD) for each battery; and a motor control circuitry in cooperation with the battery management system to draw currents, within throttle-dependent limits, from the battery assembly to drive the plurality of traction motors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A locomotive comprising:
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a first locomotive platform carrying no internal combustion engine on board; a battery assembly including strings of batteries; a plurality of traction motors that can be powered by the battery assembly to drive the locomotive, the plurality of traction motors receiving no power supplied from any power source external to the locomotive during operation; a DC bus coupling the battery assembly to the plurality of traction motors; and a battery management system comprising a plurality of BMS units, each said BMS unit comprising a microcontroller or microprocessor, a charge equalization circuit comprising a bi-directional DC-DC converter operatively connecting to a temporary buffer for battery equalization, and at least one temperature sensor, and each said BMS unit being operatively connected with one of the strings of batteries and configured to;
(a) measure electrical parameters including voltage of said string of batteries, (b) monitor temperatures of said string of batteries, and (c) equalize charges among the batteries of said string to maintain a desired state of charge (SOC) and depth of discharge (DOD) for each battery. - View Dependent Claims (14, 15, 16, 17)
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18. A train comprising:
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a first locomotive platform carrying at least one diesel-electric engine to drive the train; a second locomotive platform separate from the first locomotive platform, the second locomotive platform carrying no internal combustion engine on board; a battery assembly including strings of batteries carried on the second locomotive platform; a plurality of traction motors that can be powered by the battery assembly to drive the train; and a battery management system comprising a plurality of BMS units, each said BMS unit comprising a microcontroller or microprocessor, a charge equalization circuit comprising a bi-directional DC-DC converter operatively connecting to a temporary buffer for battery equalization, and at least one temperature sensor, and each said BMS unit being operatively connected with one of the strings of batteries and configured to;
(a) measure electrical parameters including voltage of said string of batteries, (b) monitor temperatures of said string of batteries, and (c) equalize charges among the batteries of said string to maintain a desired state of charge (SOC) and depth of discharge (DOD) for each battery.
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Specification