Multiple prime power source locomotive control
First Claim
1. A propulsion system, comprising:
- (a) a plurality of prime power systems, each prime power system comprising;
a prime power source device; and
an energy conversion device operable to convert energy output by the prime power device into direct current electrical energy;
(b) a direct current bus connecting the plurality of prime power systems, the direct current bus being operable to carry the direct current electrical energy to and/or from the prime power systems;
(c) a voltage sensor for measuring a voltage level across the direct current bus;
(d) a plurality of current sensors, each current sensor measuring a direct current electrical energy outputted by a selected prime power system; and
(e) a control system operable, based on the measured voltage level across the direct current bus and the respective measured direct current electrical energy into and/or out of each prime power system, to control at least one of;
(i) a mechanical parameter of the selected prime power system;
(ii) an electrical parameter of the selected prime power system; and
(iii) an electrical parameter of the direct current bus.
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Accused Products
Abstract
The present invention is directed to a control strategy for operating a plurality of prime power sources 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 multi power plant systems 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 electrical architecture so that prime power sources need not be synchronized.
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Citations
32 Claims
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1. A propulsion system, comprising:
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(a) a plurality of prime power systems, each prime power system comprising;
a prime power source device; and
an energy conversion device operable to convert energy output by the prime power device into direct current electrical energy;
(b) a direct current bus connecting the plurality of prime power systems, the direct current bus being operable to carry the direct current electrical energy to and/or from the prime power systems;
(c) a voltage sensor for measuring a voltage level across the direct current bus;
(d) a plurality of current sensors, each current sensor measuring a direct current electrical energy outputted by a selected prime power system; and
(e) a control system operable, based on the measured voltage level across the direct current bus and the respective measured direct current electrical energy into and/or out of each prime power system, to control at least one of;
(i) a mechanical parameter of the selected prime power system;
(ii) an electrical parameter of the selected prime power system; and
(iii) an electrical parameter of the direct current bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A propulsion system, comprising:
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(a) a plurality of prime power systems, each prime power system comprising;
a prime power source device; and
an energy conversion device operable to convert energy output by the prime power device into direct current electrical energy;
(b) one or more energy storage systems (c) a direct current bus connecting the plurality of prime power systems, the direct current bus being operable to carry the direct current electrical energy to and/or from the prime power systems;
(d) a voltage sensor for measuring a voltage level across the direct current bus;
(e) a plurality of current sensors, each current sensor measuring a direct current electrical energy outputted by a selected prime power system; and
(f) a control system operable, based on the measured voltage level across the direct current bus and the respective measured direct current electrical energy into and/or out of each prime power system, to control at least one of;
(i) a mechanical parameter of the selected prime power system;
(ii) an electrical parameter of the selected prime power system; and
(iii) an electrical parameter of the direct current bus.
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16. In a multi-prime power source vehicle, a propulsion method, comprising:
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(a) determining an operating voltage range for a direct current electrical bus;
(b) determining a power requirement to be provided to the direct current electrical bus by a plurality of prime power systems;
(c) selecting at least a subset of the prime power systems to provide the determined power requirement to the direct current electrical bus;
(d) determining a first magnitude of an operational parameter for each of the selected prime power systems to provide, to the direct current electrical bus, the selected prime power system'"'"'s portion of the determined power requirement;
(e) setting each of the selected prime power systems to the corresponding first magnitude of the determined operational parameter to provide the selected prime power system'"'"'s portion of the determined power requirement to the direct current electrical bus;
(f) measuring an electrical parameter of each of the selected prime power systems;
(g) comparing the measured electrical parameter of each of the selected prime power systems to the corresponding portion of the determined power requirement; and
(h) if needed, adjusting at least one of (i) the first magnitude of the operational parameter of the selected prime power system and (ii) the electrical parameter of the selected prime power system to produce the corresponding required electrical power output for the selected prime power system. - View Dependent Claims (17, 18, 19, 20)
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21. A propulsion method in a multi-prime power source vehicle, comprising:
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(a) determining an operating voltage range for a direct current electrical bus;
(b) determining a power requirement to be provided to the direct current electrical bus by a plurality of prime power systems;
(c) selecting a prime power source operating mode from among a plurality of differing prime power source operating modes;
(d) based on the determined power requirement and selected prime power source operating mode, selecting at least a subset of the prime power systems to provide the determined power requirement to the direct current electrical bus; and
(e) based on the determined power requirement and selected prime power source operating mode, setting at least one of (i) an operational mechanical parameter for each of the selected prime power systems and (ii) an operational electrical parameter for each of the selected prime power systems, to provide the selected prime power system'"'"'s portion of the determined power requirement to the direct current electrical bus. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification