U.S. patent number 3,863,618 [Application Number 05/379,352] was granted by the patent office on 1975-02-04 for butterfly valve arrangement for a combustion engine having external ignition.
This patent grant is currently assigned to Volkswagenwerk Aktiengesellschaft. Invention is credited to Norbert Scholz.
United States Patent |
3,863,618 |
Scholz |
February 4, 1975 |
BUTTERFLY VALVE ARRANGEMENT FOR A COMBUSTION ENGINE HAVING EXTERNAL
IGNITION
Abstract
For a combustion engine having combustion spaces therein, an
ignition circuit for delivering an ignition spark to the combustion
spaces, a butterfly valve for controlling the fuel mixture to said
combustion spaces, a closure spring for returning the butterfly
valve into a closed position when the associated accelerator is not
actuated, the ignition circuit including the closure spring as an
element, whereby when the closure spring develops a discontinuity,
the ignition circuit is prevented from delivering a spark to the
combustion spaces.
Inventors: |
Scholz; Norbert (Wolfsburg,
DT) |
Assignee: |
Volkswagenwerk
Aktiengesellschaft (Wolfsburg, DT)
|
Family
ID: |
5855042 |
Appl.
No.: |
05/379,352 |
Filed: |
July 16, 1973 |
Foreign Application Priority Data
|
|
|
|
|
Aug 31, 1972 [DT] |
|
|
2242737 |
|
Current U.S.
Class: |
123/198DC;
123/630; 123/198D |
Current CPC
Class: |
F02D
17/00 (20130101); F02D 2700/058 (20130101) |
Current International
Class: |
F02D
17/00 (20060101); F02b 077/08 (); F02p
011/00 () |
Field of
Search: |
;123/198D,198DA,198DC,198DB,118,142,148S |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Myhre; Charles J.
Assistant Examiner: Argenbright; Tony
Attorney, Agent or Firm: Marmorek; Ernest F.
Claims
Having thus described the invention, what I claim as new and desire
to be secured by Letters Patent, is as follows:
1. In a combustion engine having combustion space means, an
ignition arrangement for deliverying an ignition spark to the
combustion space means, a butterfly valve means for controlling the
fuel mixture to said combustion space means, a closure spring means
for returning said butterfly valve means into a closed position
when an associated accelerator is not actuated, said ignition
circuit arrangement including said closure spring means, whereby
when said closure spring means develop a discontinuity, said
ignition circuit arrangement is prevented from delivering a spark
to said combustion space means wherein said ignition circuit
arrangement includes an ignition coil means and an interrupter
contact means, a circuit portion connecting said ignition coil
means with said interrupter contact means, said closure spring
means being placed into said circuit portion.
2. In a combustion engine having a combustion space means, an
ignition arrangement for delivering an ignition spark to the
combustion space means, a butterfly valve means for controlling the
fuel mixture to said combustion space means, a closure spring means
for returning said butterfly valve means into a closed position
when an associated accelerator is not actuated, said ignition
circuit arrangement including said closure spring means, whereby
when said closure spring means develop a discontinuity said
ignition circuit arrangement is prevented from delivering a spark
to said combustion space means wherein said closure spring means
are connected into an energizing circuit of a delayed action relay
means, an operating contact of said relay means being placed into
said ignition circuit arrangement.
Description
FIELD OF THE INVENTION
The present invention relates to a butterfly valve arrangement for
a combustion engine having external auto-ignition, especially those
which are used in motor vehicles and, which have a locking spring
or closing spring associated with the butterfly valve.
BACKGROUND OF THE INVENTION
It is well-known that if the locking spring breaks, which otherwise
under normal conditions should retain the butterfly valve in its
closed position when the accelerator of the vehicle is not
actuated, a quite frequently occurring and dangerous situation sets
in, in which the butterfly valve remains open and, when the motor
is undergoing the coupling stage, it will not perform a braking of
the vehicle, but to the contrary, it will cause an acceleration of
the vehicle. Such a situation may occur not only in motor vehicles,
but also in railroad equipment using combustion engines.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide in
a combustion engine an improved butterfly valve arrangement of the
above described type in which, in the event the locking spring
associated butterfly valve will break or otherwise becomes
inoperative, the locking spring will not cause an undesired
acceleration of the vehicle by affecting the butterfly valve in the
above manner.
Accordingly, the present invention provides that the locking spring
associated with the butterfly valve in a combustion engine is made
part of the ignition circuit by being a current-conducting element
thereof.
As a result, and due to the fact that the locking spring of the
butterfly valve is made an electrical component of the ignition
circuit arrangement, the ignition circuit, in the event the locking
spring breaks or is disabled due to other conditions, will
interrupt the circuit and thereby will cause a stalling of the
motor.
In a preferred embodiment of the present invention, the locking
spring constitutes an element placed in a connecting line between
the ignition coil and the breaking contact. It is noted that the
locking spring and its bearings, as well as its surroundings, are
provided with appropriate insulations so that the otherwise proper
electrical operation of the vehicle is assured. In the event, for
example, the locking spring is mounted on a lug of the carburetor,
on the gas distributor of the combustion engine, and on a pivoting
lever which is coupled with the butterfly valve, then such a lug
must be made from an insulating material or at least must contain
an insulating material on its surface. It is also preferred that
the locking spring itself or its immediate surrounding is shielded
with an insulating material so that in the event the locking spring
breaks, the portion of the spring which comes in contact with the
hot terminal of the power supply, will not cause a short circuit of
the entire automotive circuit. The question and details of
insulation should be understood by an average expert in the field
of the automotive electrical art.
In the event the locking spring breaks when the vehicle, for
example, is in the middle of a very busy intersection or, when the
vehicle is in the middle of a critical traffic condition, then it
is preferred, according to the present invention, that an alarm
signal is given. However, the vehicle is capable of moving still
for a short distance in order to be able to remove itself from the
intersection or from the critical traffic condition. Shortly after
this, the interruption of the ignition circuit occurs. This
requirement of the present invention can be met by the provision of
a delayed action relay in series with the closure spring means
which has a contact placed into the ignition circuit.
BRIEF DESCRIPTION OF THE DRAWING
The invention will become more readily apparent from the following
description of preferred embodiments thereof shown, by way of
example, in the accompanying drawing, in which:
FIGS. 1 and 2 are schematic illustrations of the parts of the
combustion engine which are necessary for the understanding of the
operation of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to FIG. 1 it is noted that the combustion engine is
provided with a carburetor 1 which, in the event of a combustion
engine having fuel injection, should identify the fuel distributor.
Into the carburetor 1, in the lower portion thereof with respect to
the flow direction of the gas mixture, a butterfly valve 2 is
mounted on a shaft 3 which, in turn, is fixedly coupled with a
lever 4, with the help of which the butterfly valve 2 can be
rotated within the carburetor 1 in a well-known manner. The
pivoting movement is caused by a rod 5 which, in turn, is coupled
with the accelerator 6 of the vehicle.
One of the arms of the lever 4 is coupled with a locking spring 7
which at its other end portion 8, as seen in the figure, is secured
to the carburetor body 1. The locking spring 7 is preferably formed
as a tension spring and, as a result of which, when the accelerator
6 is not operated, the butterfly valve 2 will pivot into its closed
position by undergoing a counterclockwise rotation, as viewed in
the figure. The figure schematically illustrates only certain
portions of the combustion engine which are necessary to understand
the operation of the present invention, and it shows the ignition
arrangement which includes a battery 9, an ignition switch 10, an
ignition coil 11, an ignition condenser 12 and a breaker contact
13, all connected into the circuit as shown. Of course, the
delivery of the ignition spark to the spark-plug is illustrated
only schematically by the arrow. The ignition coil 14 is connected
to the breaker contact 13 by means of a conductor 14.
According to the present invention, the locking spring or closure
spring 7 is connected into the conductor 14 between the ignition
coil 11 and the breaker contact 13 as an electrical element itself,
so that when the closure spring 7 breaks, or a discontinuity
affects its mechanical activity, the ignition current circuit
becomes interrupted and, as a result, the combustion engine will be
turned off. One will understand, consequently, that when the
accelerator 6 is not actuated or operated, the vehicle will not
undergo an acceleration even when the closure spring 7 is broken
and the butterfly valve 2 cannot pivoted into its closing
position.
As has already been explained under the broad concepts of the
present invention and shown in FIG. 2, as an alternative, the
closure spring 7 is made a part of the electrical excitation
circuit 15 of a relay 16 which is energized through the ignition
contact 10 and which relay has an operating contact 17 placed into
the connecting conductor 14. In this case, when the ignition
contact 10 is closed, the ignition current passes over the normally
closed contact 17 when the closure spring 7 is in normal condition.
On the other hand, when the closure spring 7 breaks, the excitation
circuit 15 of the relay 16 will be opened, whereupon the normally
closed contact 17 of the relay will open the circuit passing
through the conductor 14, which is the ignition circuit.
The above mentioned relay, according to the present invention, is
designed to include a delayed feature, that is, its contact 17 will
open only with a certain delay after the closure spring 7 has
broken and will interrupt the ignition circuit only with such
delay.
The butterfly valve 2, under the broad concept of the present
invention, should also include an air quantity regulating device
which is used in the air suction system of a combustion engine
having fuel injection. It is noted that in all the above described
structural arrangements the preventive circuit arrangement,
according to the present invention, will operate quickly and
prevent damage to the engine which otherwise would flow from the
very high revolutions which would be present, such as, for example,
during the coupling of the engine and, solely caused by the broken
closure spring 7 and the consequently resulting opened position of
the butterfly valve 2.
I wish it to be understood that I do not desire to be limited to
the exact details of construction shown and described, for obvious
modifications will occur to a person skilled in the art.
* * * * *