Internal-combustion engines – Spark ignition timing control – Electronic control
Patent
1998-10-02
2000-03-07
Solis, Erick R.
Internal-combustion engines
Spark ignition timing control
Electronic control
12340627, G01M 1500, F02P 500
Patent
active
060326484
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for controlling ignition in a multi-cylinder internal combustion engine having an integrated misfire detection system. An ignition system for internal combustion engines in which the rotation speed of the crankshaft is monitored in a control device, on the basis of a plurality of marks on a rotation speed pickup wheel and at high resolution, by means of a sensor. After each ignition event has occurred, a previously sensed and averaged rotation speed value is compared, in a control circuit, with the instantaneous rotation speed value. In the event of a decrease in rotation speed or if positive acceleration is absent, an ignition misfire is detected.
SUMMARY OF THE INVENTION
The ignition system according to the present invention, includes an improved misfire detection system for a multi-cylinder internal combustion engine. By forming an average torque value over a definable number of previous combustion events, an evaluation can be made as to whether the current combustion event to be evaluated deviates greatly from that average, and in the event of such a deviation the misfire detection system can be switched to inactive status so that a misfire is not incorrectly detected. This ensures that a torque surge due to an adjustment in ignition angle does not result in detection of a misfire.
In an exemplary embodiment of the present invention, the plausibility of the deviation from the average of the torque of the combustion event being evaluated is examined. This tests whether said deviation has occurred as a result of the control variable that was output. It is also advantageous to limit changes in ignition angle--which occur, for example, as a result of a knock control system or the application of a dynamic lead--to a definable ignition angle change band. As a result, large torque surges between one combustion event and another are avoided, and the misfire detection system can remain active. If an unequivocal deviation in the torque values occurs despite the limitation on ignition angle change, it may be concluded that there is a system fault.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an exemplary embodiment of the ignition system of the present invention.
FIG. 2 is a flowchart of an exemplary method in accordance with the present invention.
FIG. 3 is a flowchart of an exemplary method, for a large number of cylinders,in accordance with the present invention.
DETAILED DESCRIPTION
FIG. 1 shows the basic layout of an ignition system, in which the parameters of an internal combustion engine, sensed by sensors (not depicted), are conveyed as input variables 13 to a control device 10 which controls fuel injection 11 and ignition 12 in the individual cylinders of the internal combustion engine. A knock sensor KS senses engine noises and conveys them to a knock analysis circuit 14 which then forwards a signal to control device 10. Information is therefore available in control device 10 as to whether a knocking or non-knocking combustion event has taken place. In addition, a misfire detection stage 15 is connected to the control device. The misfire detection stage 15 is connected to the individual cylinders of the internal combustion, the connection 16 being depicted here as a dashed line. Numerous varieties of misfire detection system exist. For example, a rough-running process can be performed, monitoring of the ignition voltage transformed on the primary side can be undertaken, or the spark duration can be analyzed. Each of these possibilities for misfire detection is conventional, and will not be explained here in detail. The misfire detection system is therefore depicted in FIG. 1 only as a block, and connection 16 depicts the fact that such a connection to the misfire detection system exists.
FIG. 2 depicts the principle of the method according to the present invention. In a first step 20, after a combustion event, the torque DM.sub.Z1 of the internal combustion engine is determined from the variables that were sensed; cylinde
REFERENCES:
patent: 5119783 (1992-06-01), Kamurasaki
patent: 5201293 (1993-04-01), Langner et al.
patent: 5241937 (1993-09-01), Kanehiro et al.
patent: 5327867 (1994-07-01), Hisaki et al.
patent: 5559285 (1996-09-01), Bryant et al.
patent: 5598821 (1997-02-01), Terata et al.
patent: 5606120 (1997-02-01), Daicho et al.
Edelmann Thomas
Kaltenbrunn Peter
Mayer Ulrich
Robert & Bosch GmbH
Solis Erick R.
LandOfFree
Method of controlling ignition in a multicylinder internal combu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of controlling ignition in a multicylinder internal combu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling ignition in a multicylinder internal combu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-353745