Power train system

• US 10,458,347 B2
• Filed: 07/27/2015
• Issued: 10/29/2019
• Est. Priority Date: 07/27/2015
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sukegawa, Yoshihiro, Kaneeda, Masato, Hatamiya, Shigeo
• Primary Examiner(s): Tran, Binh Q
• Application Number:
  US15/746,648
• Publication Number:
  US 20180209361A1
• Time in Patent Office: 1,555 Days
• CPC Class Codes: F02D 2200/021 Engine temperature
• CPC Class Codes: F02D 2200/0414 Air temperature
• CPC Class Codes: F02D 2200/0418 Air humidity
• CPC Class Codes: F02D 2200/0606 Fuel temperature
• CPC Class Codes: F02D 2200/0611 Fuel type, fuel composition or fuel quality
• CPC Class Codes: F02D 2200/0614 Actual fuel mass or fuel injection amount
• CPC Class Codes: F02D 2200/1002 Output torque
• CPC Class Codes: F02D 2200/101 Engine speed
• CPC Class Codes: F02D 41/005 according to engine operating conditions
• CPC Class Codes: F02D 41/0052 Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
• CPC Class Codes: F02M 2026/009 EGR combined with means to change air/fuel ratio, ignition timing, charge swirl in the cylinder
• CPC Class Codes: F02M 26/35 with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
• CPC Class Codes: F02M 26/36 with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
• CPC Class Codes: F02M 26/45 Sensors specially adapted for EGR systems
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

To provide a novel power train system capable of improving fuel efficiency, reducing harmful components of an exhaust gas, and improving an output by adjusting a composition of a gas component of the exhaust gas in accordance with an operation condition. Therefore, provided is a power train system including a gas component separation unit (2) which extracts a plurality of gas components having different specific heat ratios from an exhaust gas of a spark ignition type internal combustion engine (1), a recirculation unit which recirculates the plurality of gas components to a combustion chamber of the internal combustion engine, and a ratio adjustment unit (3) which adjusts a ratio of the plurality of gas components recirculated to the combustion chamber in response to an operation state of the internal combustion engine. A composition of a gas recirculated to the internal combustion engine can be adjusted depending on various operation conditions. Accordingly, it is possible to improve fuel efficiency, reduce harmful components of an exhaust gas, and improve an output in a wide range of operation conditions of the internal combustion engine.

Claims

1. A power train system comprising:

a spark ignition type internal combustion engine;

a gas component separation device which extracts a plurality of gas components having different specific heat ratios from an exhaust gas of the internal combustion engine;

a recirculation device which recirculates the plurality of gas components to a combustion chamber of the internal combustion engine; and

a gas components ratio adjustment device which adjusts a ratio of the plurality of gas components recirculated to the combustion chamber in response to an operation state or a fuel property state of the internal combustion engine,

wherein the gas components having different specific heat ratios are a gas component having a relatively large specific heat ratio and a gas component having a relatively small specific heat ratio, and

wherein the gas components ratio adjustment device increases a ratio of the gas component having a relatively large specific heat ratio when an engine torque of the internal combustion engine is lower than a predetermined value and increases a ratio of the gas component having a relatively small specific heat ratio when the engine torque is higher than the predetermined value.

2. The power train system according to claim 1,

wherein the gas components ratio adjustment device decreases a ratio of the gas component having a relatively large specific heat ratio and increases a ratio of the gas component having a relatively small specific heat ratio as an engine torque of the internal combustion engine increases.

3. The power train system according to claim 1,

wherein the gas components ratio adjustment device decreases a ratio of the gas component having a relatively large specific heat ratio and increases a ratio of the gas component having a relatively small specific heat ratio when a fuel supply amount supplied to the internal combustion engine is large.

5. The power train system according to claim 1,

wherein the gas components ratio adjustment device decreases a ratio of the gas component having a relatively large specific heat ratio and increases a ratio of the gas component having a relatively small specific heat ratio as a cooling water temperature, an intake air temperature, a fuel temperature, or an external air temperature of the internal combustion engine increases.

6. The power train system according to claim 1,

wherein the gas components ratio adjustment device increases a ratio of the gas component having a relatively large specific heat ratio and decreases a ratio of the gas component having a relatively small specific heat ratio as an octane number of fuel supplied to the internal combustion engine increases.

7. The power train system according to claim 1,

wherein the gas components ratio adjustment device increases a ratio of the gas component having a relatively large specific heat ratio and decreases a ratio of the gas component having a relatively small specific heat ratio as an alcohol concentration of fuel supplied to the internal combustion engine increases.

8. The power train system according to claim 1,

wherein the gas components ratio adjustment device increases a ratio of the gas component having a relatively large specific heat ratio and decreases a ratio of the gas component having a relatively small specific heat ratio as a natural gas concentration of fuel supplied to the internal combustion engine increases.

10. The power train system according to claim 1,

wherein the gas components ratio adjustment device increases a ratio of the gas component having a relatively large specific heat ratio and decreases a ratio of the gas component having a relatively small specific heat ratio as an intake humidity of intake air taken into the internal combustion engine increases.

11. The power train system according to claim 1,

wherein the gas component having a relatively small specific heat ratio is carbon dioxide separated from the exhaust gas and the gas component having a relatively large specific heat ratio is nitrogen separated from the exhaust gas.

4. A power train system comprising:

a spark ignition type internal combustion engine;

a gas component separation device which extracts a plurality of gas components having different specific heat ratios from an exhaust gas of the internal combustion engine;

a recirculation device which recirculates the plurality of gas components to a combustion chamber of the internal combustion engine; and

a gas components ratio adjustment device which adjusts a ratio of the plurality of gas components recirculated to the combustion chamber in response to an operation state or a fuel property state of the internal combustion engine,

wherein the gas components having different specific heat ratios are a gas component having a relatively large specific heat ratio and a gas component having a relatively small specific heat ratio, and

wherein the gas components ratio adjustment device increases a ratio of the gas component having a relatively large specific heat ratio and decreases a ratio of the gas component having a relatively small specific heat ratio in response to one of the following;

(i) a rotation speed of the internal combustion engine increases while an engine torque of the internal combustion engine is large;

(ii) an octane number of fuel supplied to the internal combustion engine increases;

(iii) an alcohol concentration of fuel supplied to the internal combustion engine increases;

or

(iv) an intake humidity of intake air taken into the internal combustion engine increases.

12. The power train system according to claim 4,

wherein the gas component having a relatively small specific heat ratio is carbon dioxide separated from the exhaust gas and the gas component having a relatively large specific heat ratio is nitrogen separated from the exhaust gas.

9. A power train system comprising:

a spark ignition type internal combustion engine;

a gas component separation device which extracts a plurality of gas components having different specific heat ratios from an exhaust gas of the internal combustion engine;

a recirculation device which recirculates the plurality of gas components to a combustion chamber of the internal combustion engine; and

a gas components ratio adjustment device which adjusts a ratio of the plurality of gas components recirculated to the combustion chamber in response to an operation state or a fuel property state of the internal combustion engine,

wherein the gas components having different specific heat ratios are a gas component having a relatively large specific heat ratio and a gas component having a relatively small specific heat ratio, and

wherein the gas components ratio adjustment device decreases a ratio of the gas component having a relatively large specific heat ratio and increases a ratio of the gas component having a relatively small specific heat ratio as an air-fuel ratio of an air-fuel mixture of fuel and air supplied to the internal combustion engine moves to a lean side when the internal combustion engine is operated in a high load.

13. The power train system according to claim 9,

wherein the gas component having a relatively small specific heat ratio is carbon dioxide separated from the exhaust gas and the gas component having a relatively large specific heat ratio is nitrogen separated from the exhaust gas.