Internal-combustion engines – High tension ignition system – Electronic cylinder sequencing
Patent
1991-06-24
1993-03-16
Nelli, Raymond A.
Internal-combustion engines
High tension ignition system
Electronic cylinder sequencing
123620, F02P 312
Patent
active
051935163
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a method of controlling the ignition of an internal combustion engine, as well as a device for controlling the ignition of an internal combustion engine.
In the case of known processes for controlling the ignition of an internal combustion engine or known ignition control devices, the individual spark plugs are triggered via a distributor. If the internal combustion engine has many cylinders, and in the case of high engine speed, the closing or dwell angle is often no longer sufficient to charge the coil adequately.
It has therefore been attempted, by means of a so-called static distribution which makes do without a distributor rotor, to extend the dwell angle, even in the case of high engine speeds. Here, single-spark coils were used each connected for activating a spark plug. With such a control system, however, problems arise whenever more than one coil is to be charged simultaneously. Elaborate control is required in order to enable such an operational mode. Ignition control devices which permit overlapping dwell angles must be equipped with as many counters as there are ignition coils to be charged. This has the disadvantage that the control devices become not only very large, but also very expensive. Moreover, the computing time for control programs which must be provided for such control devices becomes very long. Other functions which the device must also undertake are thus impaired.
SUMMARY OF THE INVENTION
The process of controlling an internal combustion engine according to the invention has the advantage that with a control device of relatively simple construction, the ignition of internal combustion engines in particular of those with more that 6 cylinders can be triggered without problem, even at high speeds. It is particularly advantageous that for all ignition coils, only a first counting device or counter is required for triggering the ignition, and a second counting device or counter is required for starting the charging process of the ignition coils. Although each individual ignition is not equipped with its own counter, a dwell angle overlap can be easily achieved.
In a preferred embodiment of the invention, the count of the second counter is reduced step by step by a crankshaft angle dependent timing signal. The charging process of a coil is initiated as soon as the count of the second counter takes on the value ZERO. At the same time, a starting control value which has been computed for the next ignition coil, is input into the second counter. The higher is the input starting value the later is the commencement of the charging process for the next coil. Thus the start of the charging process in respective coils can be controlled through the selection of the starting values successively loaded into the second counter. It is evident that this type of control is particularly easy to carry out.
An especially preferred embodiment of the method of the invention is characterized by the fact that the starting value for a coil in a next ignition cycle can be calculated in advance during one or more, preferably two, crankshaft revolutions, using the equation
A1 represents the value of a control interval between the start point SPn of the charging process for the last coil n within a current ignition cycle and the charge starting point SP1' for the first coil 1 in the next ignition cycle, and .sub.s denotes the closing angle of the first coil 1. AR2 denotes the residual value of the control interval A2 remaining in the second counter at the instant when the ignition triggering time point T1 for the first coil 1 has been reached in the first counter. Similarly, A3, A4 to An denote the charge control interval values of the coils 3 through a within the current ignition cycle. It can be seen from the equation that the expenditure for determining the next charge control interval for a coil is relatively low and, consequently, the control process is very simply to realize.
The control device for carrying out the method of this invention has the ad
REFERENCES:
patent: 4979487 (1990-12-01), Fukui
patent: 5009213 (1991-04-01), Di Nunzio et al.
patent: 5042449 (1991-08-01), Dassetto
patent: 5052358 (1991-10-01), Fukui
patent: 5060623 (1991-10-01), McCoy
patent: 5065729 (1991-11-01), Krauter et al.
Bauer Bernard
Jurgen Zimmermann
Nelli Raymond A.
Robert & Bosch GmbH
Striker Michael J.
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