Method and device for operating an internal combustion engine
A technology of internal combustion engine and ignition device, applied in the direction of internal combustion piston engine, other devices, combustion engine, etc., can solve problems such as large torque
Inactive Publication Date: 2011-06-01
ROBERT BOSCH GMBH
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- Application Information
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Problems solved by technology
In this case, however, the point in time for generating the ignition spark is too early in the relevant synchronization, and the resulting torque is too high
[0009] Gas spring compensation cannot be performed in conventional ignition systems because a rapid jump in the ignition time has to be achieved with gas spring compensation, so that all torques caused by idle cylinders are compensated
Method used
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Embodiment Construction
[0035] figure 1 An engine system 1 is shown schematically with an internal combustion engine 2 , which in the illustrated exemplary embodiment has four cylinders Z1 to Z4 . Air is supplied to the cylinders Z1 to Z4 via an intake system 3 , wherein the air quantity can be adjusted by means of a throttle valve 4 . Combustion exhaust gases are discharged from cylinders Z1 to Z4 via an exhaust system 5 .
[0036] Injectors 6 are arranged on cylinders Z1 to Z4 in order to inject fuel. In contrast to this direct injection, the fuel can also be injected in the intake tract section of the intake system 3 . In addition, the cylinders Z1 to Z4 are equipped with ignition devices 7 , such as spark plugs, which can generate an ignition spark in a controlled manner via the control unit 10 in order to ignite the air-fuel mixture in the associated cylinder Z1 to Z4 .
[0037]The torque provided by internal combustion engine 2 can be adjusted essentially by varying the air quantity fed into...
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A method and apparatus for operating an internal combustion engine having several cylinders, successive time windows, each of which is assigned to a cylinder being defined in a control unit in one time window, a calculation of an ignition time, a start of a charging process for an ignition device, and a triggering of an ignition for a cylinder assigned to the time window being performed; it being necessary for an ignition to start the charging process for the ignition device, the extent of which is at least as long as one time period needed for charging; the following steps being carried out in each time window: ascertaining information for an ignition time for a cylinder assigned to the subsequent time window; establishing whether the ignition time for the cylinder assigned to the subsequent time window is after the beginning of the subsequent time window by at least the time needed for charging; if it is established that the ignition time for the cylinder assigned to the subsequent time window is after the beginning of the subsequent time window by less than the time needed for charging, then starting of a charging process for the ignition device of the cylinder assigned to the subsequent time window.
Description
technical field [0001] The invention relates to an internal combustion engine, in particular to a method for operating an internal combustion engine with torque compensation by adjusting the ignition angle. Background technique [0002] Internal combustion engines, especially gasoline engines, can be operated in different engine operating conditions in which a different number of cylinders are in operation and thus provide torque, while the remaining cylinders are all deactivated and not providing torque. The operating condition of an internal combustion engine in which all cylinders are operating, ie all cylinders provide torque, is referred to as full engine load operation, while the operating condition in which only a part of the cylinders is operating is referred to as engine part load operation. In a dead cylinder, the piston is only entrained by the movement of the crankshaft. [0003] Transitions between engine operating conditions create torque jumps that must be co...
Claims
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IPC IPC(8): F02P5/15
CPCF02D2250/21Y02T10/18F02D37/02F02D13/06F02P3/045Y02T10/46F02D41/0087F02P5/1504F02B2075/027Y02T10/12Y02T10/40
Inventor F·瓦尔特
Owner ROBERT BOSCH GMBH