# US 10,865,687 B2 · Exhaust gas energy recovery device

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- Number: US 10,865,687 B2
- Document ID: US10865687B2
- Status: Granted
- Kind: B2
- Application number: 16/344,238
- Filed: 2017-11-07
- Published: 2019-08-22
- Granted: 2020-12-15
- Earliest claimed: 2016-11-07
- Assignees: IHI Corporation
- Applicants: IHI Corporation
- Inventors: Yuji Sasaki; Takashi Yoshida; Tatsumi Inomata; Kuniaki Iizuka; Takuya Ozasa; Ryosuke Yumoto
- Web page: https://patentgrep.com/patent/US10865687B2

## CPC

- F01N 5/04: the devices using kinetic energy
- B60W 10/26: for electrical energy, e.g. batteries or capacitors
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- F02B 39/10: electric
- F02B 41/10: in exhaust turbines (use of exhaust turbines for charging F02B37/00)
- F02C 6/12: Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
- F02G 5/02: Profiting from waste heat of exhaust gases
- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J 7/02: for charging batteries from AC mains by converters
- H02J 7/14: for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J 7/1423: {with multiple batteries}
- H02J 7/34: Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence)
- H02J 7/90: Regulation of charging or discharging current or voltage
- H02M 3/155: using semiconductor devices only
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02P 9/04: Control effected upon non-electric prime mover and dependent upon electric output value of the generator
- H02P 9/48: Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle (H02P9/04 - H02P9/46 take precedence)
- F05D 2220/76: an electrical generator
- H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)}
- H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators
- H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust gas energy recovery device includes a power generation device driven by a turbine configured to rotate by an exhaust gas, a switching element connected to the power generation device, a first terminal connected to the power generation device via the switching element and for being connected to a first power storage device, and a second terminal connected to the power generation device and for being connected to a second power storage device, in which a terminal voltage of the first power storage device is lower than a terminal voltage of the second power storage device, and the switching element switches a destination to be charged by the power generation device to either the first power storage device or the second power storage device on the basis of magnitude of a direct current voltage output from the power generation device.

## Claims

### Claim 1

An exhaust gas energy recovery device, comprising:
a power generation device driven by a turbine configured to rotate by an exhaust gas of an engine;
a first terminal connected to the power generation device and connected to a first power storage device;
a second terminal connected to the power generation device and connected to a second power storage device;
a switching element connected to the power generation device that switches a destination to be charged by the power generation device to either the first power storage device or the second power storage device;
a voltmeter configured to measure a direct current voltage output from the power generation device; and
a controller configured to control the switching element to switch the destination to be charged based on a magnitude of the direct current voltage output from the power generation device measured by the voltmeter, wherein
a terminal voltage of the first power storage device is lower than a terminal voltage of the second power storage device.

### Claim 2 (depends on 1)

The exhaust gas energy recovery device according to claim 1, wherein the controller controls the switching element to be in an ON state in a case where the direct current voltage measured by the voltmeter is lower than a first voltage that is a voltage able to be supplied to the first power storage device, and controls the switching element to be in an OFF state in a case where the direct current voltage measured by the voltmeter is higher than a second voltage that is a voltage able to charge the second power storage device.

### Claim 3 (depends on 2)

The exhaust gas energy recovery device according to claim 2, wherein the controller performs pulse width modulation control for the switching element in a case where the direct current voltage measured by the voltmeter is equal to or higher than the first voltage and equal to or lower than the second voltage.

### Claim 4

An exhaust gas energy recovery device, comprising:
a generator driven by a turbine configured to rotate by an exhaust gas of an engine;
a first terminal for being connected to a first power storage device;
a second terminal for being connected to a second power storage device;
a first diode and a second diode connected to an output of the generator;
a first capacitor connected in parallel to the first diode and the second diode;
a third diode connected in series to the second terminal;
a second capacitor connected in parallel to the first terminal;
a fourth diode connected in parallel to the second capacitor;
a reactor provided between a cathode of the fourth diode and one end of the second capacitor;
a voltmeter configured to measure a voltage between both ends of the first capacitor;
a switching element provided between one end of the first capacitor and one end of the reactor; and
a controller configured to control the switching element, wherein
an anode of the first diode and a cathode of the second diode are connected to each other and are connected to the output of the generator,
a cathode of the first diode is connected to the one end of the first capacitor,
an anode of the second diode is connected to another end of the first capacitor,
a cathode of the third diode is connected to the second terminal,
an anode of the third diode is connected to the one end of the first capacitor,
the second terminal and the third diode are connected in parallel to the first capacitor, and
the controller is configured to
control the switching element to be in an ON state in a case where the voltage between both ends of the first capacitor measured by the voltmeter is lower than a first voltage that is a voltage able to be supplied to the first power storage device,
control the switching element to be in an OFF state in a case where the voltage between both ends of the first capacitor measured by the voltmeter is higher than a second voltage that is a voltage able to charge the second power storage device, and
perform pulse width modulation control for the switching element in a case where the voltage between both ends of the first capacitor measured by the voltmeter is equal to or higher than the first voltage and equal to or lower than the second voltage.