Internal combustion engine with auto ignition
First Claim
1. A method for operating an internal combustion engine with auto-ignition including a cylinder having a combustion chamber and a fuel injection device for injecting fuel into the combustion chamber, said method comprising the steps of:
- injecting fuel in different steps directly into the combustion chamber, such that a first part of the fuel is injected into the combustion chamber in a pre-injection step during one of an intake stroke and a compression stroke of the engine, injecting additional fuel into the combustion chamber at a later time in the form of a main injection step or a post-injection step, introducing a liquid with a high evaporation enthalpy into the combustion chamber during one of the intake stroke, the compression stroke and the expansion stroke in order to cool the content of the combustion chamber thereby limiting a rise in pressure in the combustion chamber and delaying ignition of fuel injected respectively during the pre-injection and the main injection steps.
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Accused Products
Abstract
In a method for operating an internal combustion engine in which fuel is injected directly into a combustion chamber in a pre-injection and a main fuel injection step, and, if appropriate, also in a post-injection step by means of an injection nozzle with a plurality of injection bores, the injection of fuel takes place in a timed fashion and, to limit pressure and temperature during combustion of the fuel in the combustion chamber, a quantity of water is introduced into the combustion chamber during or after the pre-injection step.
56 Citations
12 Claims
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1. A method for operating an internal combustion engine with auto-ignition including a cylinder having a combustion chamber and a fuel injection device for injecting fuel into the combustion chamber, said method comprising the steps of:
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injecting fuel in different steps directly into the combustion chamber, such that a first part of the fuel is injected into the combustion chamber in a pre-injection step during one of an intake stroke and a compression stroke of the engine, injecting additional fuel into the combustion chamber at a later time in the form of a main injection step or a post-injection step, introducing a liquid with a high evaporation enthalpy into the combustion chamber during one of the intake stroke, the compression stroke and the expansion stroke in order to cool the content of the combustion chamber thereby limiting a rise in pressure in the combustion chamber and delaying ignition of fuel injected respectively during the pre-injection and the main injection steps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification