# US 2018/0023458 A1 · Engine system

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- Number: US 2018/0023458 A1
- Document ID: US20180023458A1
- Status: Published application
- Kind: A1
- Application number: 15/541,888
- Filed: 2016-01-12
- Published: 2018-01-25
- Earliest claimed: 2015-01-09
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Kazuro HOTTA; Yuta FURUKAWA; Kazuo OGURA
- Web page: https://patentgrep.com/patent/US20180023458A1

## CPC

- F02B 37/013: with exhaust-driven pumps arranged in series
- F02B 37/001: {using exhaust drives arranged in parallel}
- F02B 37/004: {with exhaust drives arranged in series}
- F02B 37/007: with exhaust-driven pumps arranged in parallel {, e.g. at least one pump supplying alternatively}
- Y02T 10/12: Improving ICE efficiencies
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A engine system is provided with: a plurality of cylinder groups which burn a gas mixture and discharge an exhaust gas; a plurality of high-pressure stage superchargers each having high-pressure stage turbines driven by the exhaust gas from the corresponding cylinder group and high-pressure stage compressors rotated by driving of the high-pressure stage turbines and configured to compress a gas supplied to the corresponding cylinder group; and a plurality of low-pressure stage superchargers having a low-pressure stage turbine driven by an exhaust gas discharged from the high-pressure stage turbine of the high-pressure supercharger which is any one of the plurality of high-pressure stage superchargers, and a low-pressure stage compressor rotated by driving of the low-pressure stage turbine and configured to compress a gas supplied to the high-pressure stage compressor of the high-pressure stage supercharger other than the one high-pressure stage supercharger.

## Claims

### Claim 1

An engine system comprising:
a plurality of cylinder groups which burn a supplied gas mixture and discharge an exhaust gas;
a plurality of high-pressure stage superchargers each having a high-pressure stage turbine driven by the exhaust gas of the corresponding cylinder group, and a high-pressure stage compressor rotated by driving of the high-pressure stage turbine and configured to compress a gas supplied to the corresponding cylinder group; and
a plurality of low-pressure stage superchargers each having a low-pressure stage turbine driven by an exhaust gas discharged from the high-pressure stage turbine of any one high-pressure stage supercharger of the plurality of high-pressure stage superchargers and a low-pressure stage compressor rotated by driving of the low-pressure stage turbine and configured to compress a gas supplied to a high-pressure stage compressor of a high-pressure stage supercharger other than the one high-pressure stage supercharger.

### Claim 2

An engine system comprising:
a first cylinder group and a second cylinder group which burn a supplied gas mixture and discharge an exhaust gas;
a first high-pressure stage supercharger and a second high-pressure stage supercharger each having a high-pressure stage turbine driven by the exhaust gas of the corresponding cylinder group and a high-pressure stage compressor rotated by driving of the high-pressure stage turbine and configured to compress a gas supplied to the corresponding cylinder group;
a first low-pressure stage supercharger having a first low-pressure stage turbine driven by an exhaust gas discharged from the high-pressure stage turbine of the first high-pressure stage supercharger and a first low-pressure stage compressor rotated by driving of the first low-pressure stage turbine and configured to compress a gas supplied to the high-pressure stage compressor of the second high-pressure stage supercharger; and
a second low-pressure stage supercharger having a second low-pressure stage turbine driven by an exhaust gas discharged from the high-pressure stage turbine of the second high-pressure stage supercharger and a second low-pressure stage compressor rotated by driving of the second low-pressure stage turbine and configured to compress a gas supplied to the high-pressure stage compressor of the first high-pressure stage supercharger.

### Claim 3 (depends on 1)

The engine system according to claim 1, wherein a pipe connecting the low-pressure stage compressor to the high-pressure stage compressor is formed so that the gas introduced into the high-pressure stage compressor swirls in a rotational direction of the high-pressure stage compressor.

### Claim 4 (depends on 2)

The engine system according to claim 2, wherein a pipe connecting the low-pressure stage compressor to the high-pressure stage compressor is formed so that the gas introduced into the high-pressure stage compressor swirls in a rotational direction of the high-pressure stage compressor.