Device for generating a trigger signal from ignition pulses in a

Details Device for generating a trigger signal from ignition pulses in a Device for generating a trigger signal from ignition pulses in a

1992-10-05

1994-03-15

Wieder, Kenneth A.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Coil

324391, 123644, F02P 1700

Patent

active

052948870

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a device for generating a trigger signal from the ignition pulses of an ignition system, preferably in an internal-combustion engine. German Patent 2,443,403 discloses an ignition system which includes an ignition coil and an interrupt switch disposed in the primary circuit of the ignition coil. In order to influence the running behavior of an internal-combustion engine operated with an ignition system, a controllable switch is provided which together with an actuation switch device can be connected in parallel with the primary winding of the ignition coil and thus suppresses individual ignition processes in the internal-combustion engine. The suppression of individual ignition processes is employed, for example, for a compression check in the internal-combustion engine with utilization of the starter current or for performance and smooth engine run measurements. To be able, to easily associate the current with the individual cylinders for a compression check, a connected engine tester requires reliable information about each individual ignition pulse occurring in the ignition system, independently of whether the ignition pulse initiates an ignition process or not.
It is generally known in the art to derive a trigger signal corresponding to the ignition pulses from the primary of the ignition coil. The signals that can be picked up there have numerous interferences superposed on them and exhibit varying signal behavior as a function of initiated or suppressed ignition processes.
It is the object of the invention to provide a device for generating a trigger signal from ignition pulses of an ignition system in which each one of the ignition pulses occurring in the ignition system is represented.


SUMMARY OF THE INVENTION

The device according to the invention has the advantage that the trigger signal available at its output represents every ignition pulse occurring on the primary of an ignition coil independently of whether the ignition process for the internal-combustion engine is suppressed or not. Provided are first detection means that can be connected with the primary terminal of the ignition coil for detecting ignition pulses as well as second detection means that can be connected with a short-circuiting means for the primary winding of the ignition coil for detecting ignition pulses as well as an arrangement for combining the signals put out by the two detection means for making available a trigger signal that can be picked up at an output. The first detection means connected with the primary of the ignition coil detects primarily those ignition pulses which occur when ignition processes are permitted. The second detection means that are connectable with the short-circuiting means detect primarily those ignition pulses which occur when ignition processes are suppressed. The arrangement for combining the signals put out by the two detection means ensures that a trigger signal is available whenever an ignition pulse occurs.
A particular advantage of the device according to the invention is its simple adaptation to the ignition system. To connect the invention to the ignition system, it is merely necessary to provide two terminals in parallel with the primary of the ignition coil. These two terminals can simultaneously be employed to connect the short-circuiting means to the ignition system.
The device according to the invention is suitable for connection to different ignition systems such as, for example, conventional coil ignitions, electronic ignitions and distributor-less single and multi-function ignitions.
The first detection means which are contacted with the primary of the ignition coil advantageously include a voltage comparator which emits a signal if a predetermined threshold voltage is exceeded. The threshold is preferably tuned to the oscillations that occur on the primary side during an ignition process.
The second detection means which are connected with the short-circuiting means advantageously include a current sensor and a comparato

REFERENCES:
patent: 4165481 (1979-08-01), Wells et al.
patent: 4277752 (1981-07-01), Dinkelacker et al.
patent: 4708121 (1987-11-01), Everett et al.
patent: 4742306 (1988-05-01), Everett et al.
patent: 4795979 (1989-01-01), Kreft et al.
patent: 5134987 (1992-08-01), Mayer et al.

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