DE8329510U1 - DEVICE FOR ADJUSTING THE IGNITION OF COMBUSTION ENGINES - Google Patents

Description

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Gll328Gb

ELEKTRO-BAU SCHEIB GMBH, Martinstrasse 38, 4000 Düsseldorf

Device for adjusting the ignition angle of internal combustion engines

The invention relates to a device for adjusting the ignition angle of an ignition distributor Internal combustion engines

In order to achieve the optimal ignition angle in internal combustion engines To determine the ignition distributor, it is necessary for examinations to determine the ignition angle in both positive as well as in the negative direction, i.e. in the direction in front of or behind the theoretical

Ignition point, thus the ignition coil. actuates the ignition distributor earlier or later accordingly,

The maximum angle adjustment depends on the number of cylinders of the internal combustion engine. With a 4-cylinder engine it is 180 °, with a 6-cylinder engine 120 ° and with an 8-cylinder engine 90, ie. 90 °, 60 ° or 45 ° in each direction.

The adjustment of the ignition angle by hand is very imprecise, so that devices for the adjustment are being developed which, however, is very time-consuming and costly to intervene in

and have the disadvantage that they are through the ignition distributor be influenced electronically and mechanically

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The invention is based on the object of a relatively simple and operationally reliable device to adjust the ignition angle of internal combustion engines • to create the Distributor not affected.

This object is achieved according to the invention with a device

solved a controllable electronic circuit with a coding switch, a changeover switch for positive or negative angular distribution and two connection terminals, with which the device in the circuit between the breaker contact and the ignition coil can be switched on, has.

The code switch is preferably a hand ski actuating three-decade switch, with the help of which the respective angular range of the adjustment can be switched on.

According to a further feature of the invention, the

Device a digital indicator for displaying the preselected set angle with corresponding

Sign on. The digital display shows the 30th

the angle set in each case and its sign, d.

H. whether it is a positive or a negative angle adjustment acts directly on. According to this

The display can then be displayed when the engine is running

around

resulting values are recorded, then a Determine the optimization of the ignition angle setting zn.

The device is expediently an electrical device that is directly connected to the public power grid g can be so that, according to a further feature of the invention, with a mains connection such as a mains plug contact is provided. Battery operation is also possible.

The device according to the invention is inexpensive to manufacture and can be placed on engine test benches in the line between the control of the
Switch on the ignition coil. The device works electro-

¹ B nical and is in no way of the type or design

. of the distributor

addicted. The working angle range is determined solely by the number of cylinders in the engine to be examined.

In the drawing is an embodiment of the invention Device for adjusting the ignition angle of internal combustion engines shown schematically, namely

1 shows a diagrammatic front view of the front 25

direction and Fig. 2 shows a circuit diagram from your to recognize is, like the device from Fig. 1-in the circuit switched on between the ignition coil and the breaker contact of the ignition distributor of an internal combustion engine will.

The device (1) designed as a table-top unit has a Housing (2) that stands on foot (3) and on the front Has handles (4j5) for convenient handling. On the front of the housing (2) there is an operating panel (6) that has a switch (7) for switching on and switching off the device, a display (8) for digitally displaying the set angle with a sign, a changeover switch (9) for setting the direction of rotation of the motor to be examined, one for preselecting the angle Serving coding switch (10) with digital display and display of the set sign of the angle, a

Push button (11) for setting the angle, a push button 15

(12) to reset the angle to 0 and a rotary knob (13) to set the device to the number of Has cylinder of the engine to be examined.

From the schematic representation in Fig. 2 it can be seen how the device (1) is used in practice will.

The device (J.) is provided with a Sieztanschluss (14), however, it can also be connected to a battery. It is connected to the primary winding via an option (15) (16) connected to an ignition coil (17), the secondary winding (18) of which is used to raise the start Switch (19) is connected to the distributor (20) of the engine to be examined. From this engine are only the spark plugs (21) indicated

The ignition coil (17) is supplied with electrical energy from a battery (22). A switch (23) is used ztan switch on the ignition. The circuit also includes Series resistors (24; 25) and a further switch (26) for increasing the start. One of the controls is a transistor containing electronics (27) provided. Finally, there is the breaker contact with the distributor (20) (28) connected.

The switch (7) is used to switch the device (1) on and off, regardless of whether the same is connected to the public Mains or connected to a battery.

After switching on device 1, the display (8) shows 00,0. Now the preselected one Enter the angle with the aid of the coding switch (10) and press the angle setting key (11), whereby the value of the The set angle is adopted by the device. By pressing the angle reset button (12), the display reset to 00.0.

The switch (9) is used to set the device (1) for left or right running ignition distributors or engines. The switch setting to the right and angle preselection + results in a positive ignition angle adjustment for clockwise motors, ' i.e. a leading ignition angle * With switch setting to the right and angle preselection - results in clockwise motors a negative ignition angle adjustment, i.e. an ignition angle lag.

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The angle display does not change when moving from right to left and vice versa. There is only one

internal switchover for positive or negative ignition angles 1-5

adjustment.

The coding switch (10) is used to set the angle preselection and the sign of the angle in steps of 0.1 °. The transfer to the angle display only takes place when the button (11) is pressed. Switching the sign takes place in every state of the device. The coding switch (10) is set to a maximum adjustment of the Angle of + 49.9 ° is limited, but there are other limitations quite possible if the device is designed accordingly.

The key (11) for setting the angle preselection can be changed by 20

Appropriate programming of the device fulfill two functions, namely either the angle while running Motor or when the motor is at a standstill, or the angle only

set with the engine running.
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The key (12) provided for resetting the angle preselection is also programmed for two functions, see above that the angle with the engine running or with the engine stopped can be reset or is automatically reset when the engine is running and when the engine is at a standstill.

With the rotary switch (13) to set the device 3g (1) to the number of cylinders of the engine to be examined can the device to different motors that

for example from 2 to 8 cylinders can be set «The setting is made before starting the engine, otherwise the angle will be incorrectly adjusted compared to the display.

The device (1) is also designed so that a Remote control and a computer connection for analog input that can shift the angle.

The option (15) contains a transistor ignition for the Ignition coil (17) or for two ignition coils.

The device intended for universal timing angle adjustment (1) works as a pulse adjuster to the ignition coil (17). A simple connection by series connection to the cable (28) of the ignition coil (17) is possible. The ignition angle processing begins with the rising edge of the distributor contact or a transistor ignition.

The device (1) measures the time between the impulses of the distributor contact (28) and calculates it, depending on the setting the number of cylinders, the angle preselection and the positive or negative angle adjustment, the pulse shift to the rising edge of the distributor contact · The pulse shift is provided by a transistor with an open Collector to the transistor ignition (option 15) passed on ^ and from there connected again to the terminal (28).

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The short internal evaluation time of 0.4 Ai sec ensures high accuracy. This enables a high accuracy of the ignition angle adjustment from 0.1 ° at 50 to over 10,000 rpm of the engine. An internal safety circuit prevents incorrect pulses.

The adjustment angle can also be set and reset by internal programming of the coding switch (10).

Claims (9)

· Ι G11328Gb Elektro-.Bau Scheib GmbH 5 protection claims 1. Device for adjusting the ignition angle of an ignition coil and an ignition distributor _{having internal combustion engines f} d a characterized in that it has a controllable electronic circuit with a coding switch (10), a changeover switch (9) for angle adjustment when the ignition distributor (20) is running to the right or left. and terminals with which it can be switched into the circuit between the ignition distributor (20) and the ignition coil (7). 2. Device according to claim 1, characterized in that that the coding switch (10) is a manually operated three-decadic switch is. 3. Device according to claim 1 or 2, characterized in that that the coding switch (10) has a digital indicator for displaying the preselected set Has angle with a corresponding sign. 4. Device according to one of claims 1 to 3, characterized in that the one indicator (6) »to display of the ignition angle actually present in each case. # t
(I. 5. Device according to one of claims 1 to 4, characterized in that it switches (11 and 12) for on f. giving the preselected ignition angle and resetting it, 6. Device according to one of claims 1 to 5, characterized in that it has a selector switch (13) for
Setting the device (1) to the number of
Cylinder of the engine to be examined has -., 7. Device according to one of claims 1 to 6, characterized in that it is connected to a network connection (14) is provided. 8. Device according to one of claims 1 to 6, characterized in that it has a battery connection. 9. Device according to one of claims 1 to 8, characterized characterized in that it is a portable tabletop unit from-25 is formed. G / h