Method and apparatus for power electronics and control of plug-in hybrid propulsion with fast energy storage
First Claim
1. A system for powering a plug-in hybrid electric vehicle comprising a vehicle drivetrain having an internal combustion engine and one or more motor-generators connected to the drivetrain, wherein the one or more motor-generators supply power to the drivetrain to propel the vehicle or start the engine or absorb power to regeneratively recharge one or more energy storage devices;
- said system comprising a first electrical energy storage device;
a second electrical energy storage device; and
power electronics;
wherein the first electrical energy storage is a battery that delivers electrical energy to the drivetrain for traction power or to start the engine, or absorbs electrical energy from the drivetrain;
wherein the second electrical energy storage device is a flywheel, capacitor, ultracapacitor, supercapacitor, or battery; and
the second electrical energy storage device only absorbs or delivers current as necessary to protect the first electrical energy storage device from current above a damage threshold for the first electrical energy storage device; and
wherein the power electronics include a polyphase power converter with a plurality of phase legs, wherein each phase leg comprises two electronic switches with diodes;
wherein both ends of each phase leg are connected to a DC bus;
wherein a center of each phase leg is connected to another electrical device;
wherein one or more capacitors are connected across the DC bus;
wherein a first of said plurality of phase legs is used as a DC-DC converter for the second electrical energy storage device; and
wherein one or more sets of three phase legs from the power converter function as one or more three phase motor drives.
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Accused Products
Abstract
A plug-in hybrid propulsion system includes a fast energy storage device that preserves battery life, where the energy storage elements of the hybrid drive train may be charged with externally supplied electricity as well as energy from the engine or regenerative braking. Electronic switches, passive electronics, an enclosure, controller circuitry, and/or control algorithms are used to manage the flow of power between a fuel powered engine, a battery, a fast energy storage system, traction motors, a charger, ancillary systems, an electrical distribution system, and/or a drive train.
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Citations
32 Claims
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1. A system for powering a plug-in hybrid electric vehicle comprising a vehicle drivetrain having an internal combustion engine and one or more motor-generators connected to the drivetrain, wherein the one or more motor-generators supply power to the drivetrain to propel the vehicle or start the engine or absorb power to regeneratively recharge one or more energy storage devices;
- said system comprising a first electrical energy storage device;
a second electrical energy storage device; and
power electronics;
wherein the first electrical energy storage is a battery that delivers electrical energy to the drivetrain for traction power or to start the engine, or absorbs electrical energy from the drivetrain;
wherein the second electrical energy storage device is a flywheel, capacitor, ultracapacitor, supercapacitor, or battery; and
the second electrical energy storage device only absorbs or delivers current as necessary to protect the first electrical energy storage device from current above a damage threshold for the first electrical energy storage device; and
wherein the power electronics include a polyphase power converter with a plurality of phase legs, wherein each phase leg comprises two electronic switches with diodes;
wherein both ends of each phase leg are connected to a DC bus;
wherein a center of each phase leg is connected to another electrical device;
wherein one or more capacitors are connected across the DC bus;
wherein a first of said plurality of phase legs is used as a DC-DC converter for the second electrical energy storage device; and
wherein one or more sets of three phase legs from the power converter function as one or more three phase motor drives. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 32)
- said system comprising a first electrical energy storage device;
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2. A method of control of the power electronics of a plug-in hybrid electric vehicle comprising a vehicle drivetrain having an internal combustion engine and one or more motor-generators connected to the drivetrain wherein the one or more motor-generators supply power to the drivetrain to propel the vehicle or start the engine or absorb power to regeneratively recharge one or more energy storage devices;
- said method comprising;
using a first electrical energy storage comprising a battery to deliver electrical energy to the drivetrain for traction power or to start the engine, and absorb electrical energy from the drivetrain;
using a second electrical energy storage device comprising a flywheel, capacitor, ultracapacitor, supercapacitor, or battery, to only absorb or deliver current as necessary to protect the first electrical energy storage device from current above a damage threshold for the first electrical energy storage device; and
using a control algorithm that receives as input a state of charge of the first electrical energy storage device, a state of charge of second electrical energy storage device, and a traction energy demand value;
wherein the control algorithm directs a flow of electrical energy in order to satisfy the traction energy demand value, prevent damage to the first electrical energy storage device, prevent damage to the second electrical energy storage device, and minimize fuel consumed by the engine. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
- said method comprising;
Specification