Compression-ignition type engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiromichi Yanagihara
Life of this patent
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Abstract
A compression-ignition type engine in which first fuel of an amount of not more than 30 percent of the maximum amount of fuel is injected in an injection timing region from about 90 degrees to about 20 degrees before top dead center of the compression stroke so that the injected fuel does not break up due to heat or burn until the top dead center of the compression stroke is substantially reached but undergoes an oxidation reaction. Next, second fuel is injected at substantially the top dead center of the compression stroke to start the combustion of the injected fuel.
Claims18
A compression-ignition type engine comprising:
- a combustion chamber;
- a fuel injector injecting fuel toward the inside of the combustion chamber;
- and
- injection control means for injecting an amount of first fuel by which amount combustion does not occur even if injected, in a predetermined injection timing region of a latter half of a compression stroke where combustion does not occur even if injected, and causing injection of second fuel at a timing later than the predetermined injection timing region to cause combustion of the first fuel and the second fuel,
- wherein the amount of the first fuel where combustion does not occur even with injection is not more than 30 percent of the maximum amount of injection.
A compression-ignition type engine comprising:
- a combustion chamber;
- a fuel injector injecting fuel toward the inside of the combustion chamber;
- and
- injection control means for injecting an amount of first fuel by which amount combustion does not occur even if injected, in a predetermined injection timing region of a latter half of a compression stroke where combustion does not occur even if injected, and causing injection of second fuel at a timing later than the predetermined injection timing region to cause combustion of the first fuel and the second fuel,
- wherein said predetermined injection timing region is from about 90 degrees before top dead center of the compression stroke to about 20 degrees before top dead center of the compression stroke.
A compression-ignition type engine comprising:
- a combustion chamber;
- a fuel injector injecting fuel toward the inside of the combustion chamber;
- and
- injection control means for injecting an amount of first fuel by which amount combustion does not occur even if injected, in a predetermined injection timing region of a latter half of a compression stroke where combustion does not occur even if injected, and causing injection of second fuel at a timing later than the predetermined injection timing region to cause combustion of the first fuel and the second fuel,
- wherein the first fuel injection timing is made earlier the higher the engine speed.
Dependencies are inferred from the claim text.