Method for increasing the high load (knock) limit of an internal combustion engine operated in a low temperature combustion mode

Patent metadata

Field	Value
Publication number	US-9562206-B2
Application number	US-201313891696-A
Country	US
Kind code	B2
Filing date	May 10, 2013
Priority date	May 10, 2013
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

Disclosed herein is a method for increasing the high load (knock) limit of an internal combustion engine operated in a low temperature combustion ignition mode, the method comprising operating the engine with a fuel composition comprising (a) gasoline having a Research Octane Number (RON) greater than 85 and (b) one or more cetane improvers.

First claim

What is claimed is:

1. A method for increasing the high load (knock) limit of an internal combustion engine operated in a low temperature combustion mode, the method comprising operating the engine with a fuel composition comprising (a) gasoline having a Research Octane Number (RON) greater than 85 and (b) one or more cetane improvers.

2. The method of claim 1 , wherein the internal combustion engine is operated in a premixed charge compression ignition mode.

3. The method of claim 1 , wherein the internal combustion engine is operated in a homogeneous charge compression ignition mode.

4. The method of claim 1 , wherein the gasoline has a RON greater than 85 and up to about 120.

5. The method of claim 1 , wherein the gasoline has a RON greater than 89.

6. The method of claim 1 , wherein the gasoline contains ethanol up to 85 vol.

7. The method of claim 1 , wherein the gasoline contains from about 0.5 up to about 20 vol. % ethanol.

8. The method of claim 1 , wherein the one or more cetane improvers are selected from the group consisting of nitrogen-containing octane, improvers, nitrogen-free cetane improvers, and mixtures thereof.

9. The method of claim 8 , wherein the nitrogen-containing cetane improvers are nitrate-containing cetane improvers.

10. The method of claim 9 , wherein the nitrate-containing cetane improvers are selected from the group consisting of substituted or unsubstantial alkyl nitrates, substituted or substituted cycloalkyl nitrates, nitrate esters of alkoxy substituted aliphatic alcohols, and mixtures thereof.

11. The method of claim 10 , wherein the alkyl nitrate compounds are selected from the group consisting of methyl nitrate, ethyl nitrate, n-propyl nitrate, isopropyl nitrate; allyl nitrate, n-butyl nitrate, isobutyl nitrate, sec-butyl nitrate, tert-butyl nitrate, n-amyl nitrate, isoamyl nitrate, 2-amyl nitrate, 3-amyl nitrate, tert-amyl nitrate, n-hexyl nitrate, 2-ethylhexyl nitrate, n-heptyl nitrate, sec-heptyl nitrate, n-octyl nitrate, sec-octyl nitrate, n-nonyl nitrate, n-decyl nitrate, n-dodecyl nitrate, isomers thereof and mixtures thereof.

12. The method of claim 11 , wherein the cycloalkyl nitrate compounds are selected from the group consisting of cyclopentyl nitrate, cyclohexyl nitrate, methylcyclohexyl nitrate, cyclododecyl nitrate, isomers thereof and mixtures thereof.

13. The method of claim 11 , wherein the nitrate esters of alkoxy substituted aliphatic alcohols are selected from the group consisting of 1-methoxypropyl-2-nitrate, ethoxpropyl-2 nitrate, 1-isopropoxy-butyl nitrate, 1-ethoxylbutyl nitrate and mixtures thereof.

14. The method of claim 8 , wherein the nitrogen-free cetane improvers are selected from the group consisting of alkyl peroxides, aryl peroxides, alky aryl peroxides, acyl peroxides, peroxy esters, peroxy ketones, per acids, hydroperoxides and mixtures thereof.

15. The method of claim 8 , wherein the nitrogen-free cetane improvers are selected from the group consisting of di-tert-butyl peroxide, cumyl peroxide, 2,5-dimethyl-2,5-di(tertiary butylperoxy) hexane, tertiary butyl cumyl peroxide, benzoyl peroxide, tertiary butyl peracetate, 3,6,9-triethyl-3,9-trimethyl-1,4,7-triperoxononan, 2,2-di(tertiary butyl) butane, peroxy acetic acid, tertiary butyl hydroperoxide and mixtures thereof.

16. The method of claim 1 , wherein the one or more cetane improvers is 2-ethylhexyl nitrate.

17. The method of claim 1 , wherein the one or more cetane improvers is di-tert-butyl peroxide.

18. The method of claim 1 , wherein the one or more octane improvers are present in the fuel composition in an amount ranging from about 0.05 to about 5 wt. %.

19. The method of claim 16 , wherein 2-ethylhexyl nitrate is present in the fuel composition in an amount ranging from about 0.05 to about 1 wt. %.

20. The method of claim 16 , wherein 2-ethylhexyl nitrate is present in the fuel composition in an amount ranging from 0.1 to about 0.5 wt. %.

21. The method of claim 17 , wherein di-tert-butyl peroxide is present in the fuel composition in an amount ranging from about 0.1 to about 5 wt. %.

22. The method of claim 17 , wherein di-tert-butylperoxide is present in the fuel composition in an amount ranging from about 0.1 to about 2 wt. %.

23. The method of claim 1 , wherein the amount of the one or more cetane improvers added to the fuel during engine operation is dependent on one or more of engine speed, power output (load), boost level, or % EGR.

24. The method of claim 1 , wherein the internal combustion engine is operated at an intake pressure of 100 kPa.

25. The method of claim 1 , wherein the internal combustion engine is operated at an intake pressure of 130 kPa.

26. The method of claim 1 , wherein the gasoline has a RON greater than 92.5.

27. The method of claim 1 , wherein the gasoline has a RON greater than 925 and up to about 120.

Assignees

• Cannella William James
• Maria Amir Gamal
• Dec John E
• Ji Chunsheng
• Chevron Usa Inc

Inventors

• Cannella William James
• Maria Amir Gamal
• Dec John E
• Ji Chunsheng

Classifications

• C10L1/10 Primary

  containing additives · CPC title

• C10L1/1811

  peroxides; ozonides · CPC title

• F02D19/084

  Blends of gasoline and alcohols, e.g. E85 · CPC title

• C10L2270/023

  for gasoline engines · CPC title

• C10L1/23

  containing at least one nitrogen-to-oxygen bond, e.g. nitro-compounds, nitrates, nitrites {(C10L1/221 takes precedence)} · CPC title