TWO-STROKE INTERNAL COMBUSTION ENGINE

• US 20200131982A1
• Filed: 03/22/2018
• Published: 04/30/2020
• Est. Priority Date: 03/23/2017
• Status: Active Grant

• Current Assignee: THOM
• Original Assignee: SAS THOM Thermic Hydrogen Oxygen Mobility
• Inventors: LOPEZ, Didier
• Granted Patent: US 11,162,413 B2
• Time in Patent Office: Days
• CPC Class Codes: C25B 1/04 by electrolysis of water
• CPC Class Codes: C25B 9/70 Assemblies comprising two or more cells
• CPC Class Codes: F02B 1/02 with positive ignition with non-timed positive ignition F02B9/06
• CPC Class Codes: F02B 2043/106 Hydrogen obtained by electrolysis
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 25/00 Engines characterised by using fresh charge for scavenging cylinders
• CPC Class Codes: F02B 33/28 Component parts, details or accessories of crankcase pumps, not provided for in, or of interest apart from, subgroups F02B33/02 - F02B33/26
• CPC Class Codes: F02B 43/10 Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
• CPC Class Codes: F02B 75/02 Engines characterised by their cycles, e.g. six-stroke
• CPC Class Codes: F02F 11/005 involving cylinder liners
• CPC Class Codes: F02F 7/0021 Construction
• CPC Class Codes: F02M 21/0206 Non-hydrocarbon fuels, e.g. hydrogen, ammonia or carbon monoxide
• CPC Class Codes: F02M 21/04 Gas-air mixing apparatus
• CPC Class Codes: F02M 25/12 the apparatus having means for generating such gases using rays and simultaneously generating ozone F02M27/06
• CPC Class Codes: F02M 26/17 in relation to the intake system
• CPC Class Codes: F02M 26/22 with coolers in the recirculation passage
• 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 27/02 by catalysts
• CPC Class Codes: F02M 35/10144 Connections of intake ducts to each other or to another device
• CPC Class Codes: Y02E 60/36 Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
• CPC Class Codes: Y02T 10/30 : Use of alternative fuels, e.g. biofuels

Abstract

The two-stroke internal combustion engine has an engine crankcase including a sealing mechanism that, at all times and under all circumstances, confine the oil in the lower crankcase. The two-stroke engine uses a gaseous fuel based on dihydrogen and dioxygen, and releases only water vapor charged with unused gaseous fuel. A device for recycling the exhaust gases serves to recover the unused gaseous fuel and to reinject it at the intake opening, or the exhaust opening.

Claims

1. A two-stroke combustion engine, comprising:

a crankcase having an upper crankcase and a lower crankcase which contains oil to lubricate a piston from a low dead position to a compression position;

a sealing means which confine, at all times and in all circumstances, the oil in the lower crankcase,

wherein the upper crankcase comprises an intake port for introducing a gaseous fuel based on dihydrogen and dioxygen, and an exhaust port which, by maintaining the oil in the lower crankcase, discharges only water vapor charged with unconsumed gaseous fuel, the exhaust port being connected to the exhaust gas recycling device recovers the unconsumed gaseous fuel and reinjects it to the intake port.

2. The two-stroke combustion engine according to claim 1, wherein the recycling device comprises a heat exchanger that separates the vapor of the gas mixture consumed by condensation.

3. The two-stroke combustion engine according to claim 1, wherein the sealing comprises a sealing member formed in the upper part of the piston.

4. The two-stroke combustion engine according to claim 1, wherein the sealing means comprise two sealing elements for respectively obstructing the exhaust port and the intake port.

5. The two-stroke combustion engine according to claim 4, wherein the sealing elements are mounted laterally on the piston and extend longitudinally on either side of the piston.

6. The two-stroke combustion engine (700) according to claim 1, further comprising:

a mixer arranged upstream of the intake port, the mixer allows the mixing of the dihydrogen and the dioxygen;

all fuels are pressurized in order to create the gaseous fuel adapted to combustion by thermal catalysis.

7. The two-stroke combustion engine according to claim 6, wherein the mixer comprises a compressed air inlet for mixing dioxygen and dihydrogen with compressed air, and varying the concentration of dioxygen and dihydrogen in the gaseous fuel.

8. The two-stroke combustion engine according to claim 7, wherein the mixer is connected to the intake port via an intake duct.

9. The two-stroke combustion engine according to claim 6, wherein the unconsumed gaseous fuel at the outlet of the recycling device is reinjected via a recovery duct at the mixer.

10. The two-stroke combustion engine according to claim 1, wherein, in the upper crankcase, the exhaust port is positioned higher than intake port.

11. The two-stroke combustion engine according to claim 1, wherein the sealing means comprise, in the lower crankcase, an expansion system which contributes to maintaining the oil in the crankcase at any time.