Method for operating an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsStephan Uhl, Andreas Roth
Life of this patent
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Abstract
The operation of an internal combustion engine under unfavorable operating conditions can lead to the formation of deposits in the combustion chamber (4). A method and an arrangement for operating an internal combustion engine (1), especially of a motor vehicle, is suggested, wherein fuel is conducted into a combustion chamber (4) and is there combusted. When deposits are detected in the combustion chamber (4), measures are initiated in a targeted manner for cleansing the combustion chamber (4). A knocking combustion is especially introduced and/or a cleansing liquid is added to the inducted combustion air.
Claims19
A method for operating an internal combustion engine including an engine for a motor vehicle, the method comprising the steps of:
- directing fuel into a combustion chamber of said engine and combusting said fuel therein;
- drawing a conclusion as to deposits in said combustion chamber from at least monitoring the effects of a cylinder equalization during operation of said engine;
- and,
- thereafter initiating measures in a targeted manner for cleansing said combustion chamber while said engine continues to be in operation.
A method for operating an internal combustion engine including an engine for a mother vehicle, the method comprising the steps of:
- directing fuel into a combustion chamber of said engine and combusting said fuel therein;
- drawing a conclusion as to deposits in said combustion chamber from at least monitoring the effects of a cylinder equalization;
- thereafter initiating measures in a targeted manner for cleansing said combustion chamber;
- directly injecting fuel into the combustion chambers of said engine with the aid of injection valves in a first operating mode during a compression phase or in a second operating mode during an induction phase;
- continuously carrying out a misfire detection;
- when detecting misfires during operation of said engine in said first operating mode, then switching over into the second operating mode;
- and,
- when misfires also occur in the second operating mode, drawing a conclusion as to a general fault and starting additional diagnostic methods for narrowing down the fault causes.
A method for operating a direct-injecting internal combustion engine including an internal combustion engine of a motor vehicle, the method comprising the steps of:
- directly injecting fuel into the combustion chambers of said engine with the aid of injection valves in a first operating mode during a compression phase or in a second operating mode during an induction phase;
- continuously carrying out at least one of a cylinder equalization with monitoring of effects and a misfire detection;
- drawing a conclusion as to the coking of the injection valves when a fault signal of said monitoring of effects is present or, when detecting a misfire during operation of said engine in said first operating mode, switching over to said second operating mode;
- and,
- when no misfire occurs in said second operating mode, drawing a conclusion as to deposits on the nozzles of said injection valves or a coking of said injection valves.
A computer program comprising:
- program-code means for carrying out a method for operating an internal combustion engine when executed on a computer, the method including the steps of:
- directing fuel into a combustion chamber of said engine and combusting said fuel therein;
- drawing a conclusion as to deposits in said combustion chamber from at least monitoring the effects of a cylinder equalization during operation of said engine;
- and,
- thereafter initiating measures in a targeted manner for cleansing said combustion chamber while said engine continues to be in operation.
A control apparatus for operating an internal combustion engine including an internal combustion engine of a motor vehicle, the control apparatus comprising:
- means for controlling the supply of fuel into a combustion chamber of said engine and combusting said fuel therein;
- means for drawing a conclusion as to deposits in said combustion chamber from at least monitoring the effects of a cylinder equalization during operation of said engine;
- and,
- means for initiating measures in a targeted manner for cleansing said combustion chamber while said engine continues to be in operation.
An internal combustion engine including an engine for a motor vehicle, the internal combustion engine comprising:
- a cylinder and a piston conjointly defining a combustion chamber;
- means for metering fuel to said combustion chamber;
- and,
- a control apparatus functioning to:
- control the metering of fuel into a combustion chamber of said engine and combusting said fuel therein;
- draw a conclusion as to deposits in said combustion chamber from at least monitoring the effects of a cylinder equalization during operation of said engine;
- and, thereafter initiate measures in a targeted manner for cleansing said combustion chamber while said engine continues to be in operation.
Dependencies are inferred from the claim text.