U.S. patent number 3,675,033 [Application Number 05/083,502] was granted by the patent office on 1972-07-04 for device for starting and stopping a diesel engine.
This patent grant is currently assigned to Automobiles Peugeot, Regie Nationale Des Usines Renault. Invention is credited to Gerard Moronval, Gilbert Richard.
United States Patent |
3,675,033 |
Richard , et al. |
July 4, 1972 |
DEVICE FOR STARTING AND STOPPING A DIESEL ENGINE
Abstract
Device for starting and stopping a combustion engine of the
Diesel type comprising a three-position switch having a stable
position in which the heater plug circuit and the engine starter
circuit are open, a second stable position in which, assuming that
the engine is insufficiently warm, the heater plug circuit is
closed, the starter circuit remaining open, and an unstable
position in which the starter circuit is closed. Means are provided
to indicate to the driver when the switch can be placed in the
unstable position. The heater plug circuit is automatically opened
at the end of a given period of time which depends on the
surrounding temperature irrespective of whether the user has or has
not placed the switch in the unstable position and actuated the
engine starter.
Inventors: |
Richard; Gilbert (Giromagny,
FR), Moronval; Gerard (La Garenne, FR) |
Assignee: |
Automobiles Peugeot (Paris,
FR)
Regie Nationale Des Usines Renault (Billancourt,
FR)
|
Family
ID: |
26214935 |
Appl.
No.: |
05/083,502 |
Filed: |
October 23, 1970 |
Foreign Application Priority Data
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|
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Jan 7, 1970 [FR] |
|
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7000360 |
Mar 31, 1969 [FR] |
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6909616 |
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Current U.S.
Class: |
290/38R;
123/145A; 123/179.21; 219/511; 290/37R; 219/492 |
Current CPC
Class: |
F02P
19/02 (20130101); F02B 1/04 (20130101); F02B
3/06 (20130101) |
Current International
Class: |
F02P
19/00 (20060101); F02P 19/02 (20060101); F02B
3/00 (20060101); F02B 1/04 (20060101); F02B
3/06 (20060101); F02B 1/00 (20060101); F02n
011/00 () |
Field of
Search: |
;290/37,38
;123/179,179H,145A,142.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Simmons; G. R.
Claims
We claim:
1. A device for starting and stopping a combustion engine of the
Diesel type or the like, comprising a source of electric current,
an engine starter, heater plugs, a heating supply circuit for the
plugs, a supply circuit for the starter, a three-position switch of
known type having a first stable position in which said two
circuits are open, a second stable position in which, assuming that
the engine is insufficiently warm, the heating circuit is closed,
the supply circuit for the starter remaining open, and a third
unstable position in which the supply circuit of the starter is
closed, a second switch inserted in said heating supply circuit and
controlled by a relay associated therewith and having a coil
connected between said source of electric current and ground in
series with a third switch, the closure of which is controlled when
said three-position switch is placed in its second position and
with a first delayed-opening contact for automatically opening the
heating circuit at the end of a given period of time which is a
function of the surrounding temperature, irrespective of whether
the user has or has not placed the three-position switch in the
third position and actuated the starter , said first
delayed-opening contact being controlled by temperature responsive
delay means inserted in the heating circuit, said delay means being
also provided for indicating to the user at which moment said
three-position switch can be placed in the third position .
2. A device as claimed in claim 1, wherein said temperature
responsive delay means comprises a second contact, a first heating
resistance for heating said first delayed-opening contact, a first
bimetallic strip controlling said second contact, said first
bimetallic strip and said first heating resistance being connected
in parallel with said heater plugs, a second heating resistance
connected in series in the heating circuit and having an operating
time which is a function of the surrounding temperature, said
second heating resistance being associated with and adapted to heat
said first bimetallic strip.
3. A device as claimed in claim 2, wherein an indicator lamp is
connected in parallel with said first resistance heating the first
delayed-opening contact.
4. A device as claimed in claim 1, wherein a normally-closed
contact is connected in series with said coil of said relay, said
normally-closed contact being adapted to open as soon as the engine
has reached a given operating speed.
5. A device as claimed in claim 1, comprising means for
neutralizing the operation of said first delayed-opening contact
while the starter is being supplied with power.
6. A device as claimed in claim 5, wherein said second heating
resistance has a low voltage terminal and the supply circuit for
the starter has a fourth switch controlling operation of the
starter, said neutralizing means comprising a diode connected
between the supply circuit for the starter and the low voltage
terminal of said second heating resistance so as to put the two
ends thereof at the same potential when the starter is supplied
with power, and a second coil actuating said relay, a relay
controlling said fourth switch being connected in parallel with
said second coil.
7. A device as claimed in claim 1, comprising a pulse control
circuit which has two stable positions and comprises a closing
valve in a fuel supply conduit of the engine, an electromagnet
having a moving part which actuates the closing valve, a first
reversing switch and a second reversing switch which coact with
said third switch so as to reverse the direction of current in said
electromagnet, the third switch being a reversing switch and
controlling the pulse control circuit.
8. A device as claimed in claim 7, comprising a safety circuit
provided in the event of faulty operation of said normally-closed
contact and including said first reversing switch combined with
said moving part and disposed between said third switch and said
one coil of said relay and a by-pass circuit comprising a fifth
switch controlled by said relay.
9. A device as claimed in claim 7, comprising a third reversing
switch actuated by said relay and controlling supply of power to
said electromagnet of said pulse control circuit.
10. A device for starting and stopping a combustion engine of the
Diesel type or the like, comprising a source of electric current,
an engine starter, heater plugs, a heating supply circuit for the
plugs, a supply circuit for the starter, a three-position switch of
known type having a first stable position in which said two
circuits are open, a second stable position in which, assuming that
the engine is insufficiently warm, the heating circuit is closed,
the supply circuit for the starter remaining open, and a third
unstable position in which the supply circuit of the starter is
closed, a second switch inserted in said heating supply circuit and
controlled by a relay associated therewith and having a coil
connected between said source of electric current and ground in
series with a third switch, the closure of which is controlled when
said three-position switch is placed in its second position and
with a delayed-opening contact for automatically opening the
heating circuit at the end of a given period of time which is a
function of the surrounding temperature, irrespective of whether
the user has or has not placed the three-position switch in the
third position and actuated the starter, and temperature responsive
delay means inserted in the heating circuit for indicating to the
user at which moment said three-position switch can be placed in
the third position, said delayed-opening contact being controlled
independently from said indicating means by a battery-charging
circuit which comprises a generator, a regulator and an associated
automatic switch.
11. A device as claimed in claim 11, wherein said delayed-opening
contact comprises a bimetallic strip, a heating resistance for
heating the bimetallic strip and connected in parallel with the
bimetallic strip when the three-position switch is placed in its
second position.
12. A device as claimed in claim 11, comprising a battery-charging
indicator controlled by said automatic switch and connected in
parallel with the heating resistance for heating the bimetallic
strip.
Description
The present invention relates to a control device for starting
engines of the Diesel type and the like and more particularly
engines driving automobile vehicles and the like.
One of the known methods employed for starting a Diesel engine
comprises heating the engine by passing during a variable period of
time an electrical current in heater plugs before actuating the
starter. The device supplying power to the heater plugs must be so
designed that the current can in no case be maintained in the plugs
permanently and especially after the engine has started. Thus this
device is usually controlled by a control or pull-rod which the
driver puts in an unstable position and must maintain in this
position during the entire heating period.
This is why in automobile vehicles equipped with a Diesel engine it
is necessary to provide starting means which distinctly differ from
those normally employed for petrol engines. Consequently,
constructors are obliged to manufacture facia panels which are
different for a given vehicle depending on whether the vehicle
receives a Diesel engine or a petrol engine. Moreover, the driver
of the vehicle equipped with a Diesel engine must effect several
inconvenient operations in succession on separate elements to start
the engine of the vehicle.
The object of the present invention is to remedy these drawbacks
and to provide an arrangement in which a Diesel engine is started
with the same control element as with a petrol engine, the user
simply effecting the same movements as for starting a normal petrol
engine.
The invention provides a device for starting and stopping a
combustion engine of the Diesel type or the like, comprising a
source of electrical current, a heating circuit, a supply circuit
for a starter, a three-position switch of known type having a first
stable position in which said two circuits are open, a second
stable position in which, assuming that the engine is cold or
insufficiently warm, the heating circuit is closed, the supply
circuit for the starter remaining open, and a third unstable
position in which the supply circuit of the starter is closed,
means for indicating to the user at which moment the switch can be
placed in the third position, and means for automatically cutting
off the supply to the heating circuit at the end of a given period
of time which is a function of the surrounding temperature,
irrespective of whether the user has or has not placed the switch
in the third position and actuated the starter.
According to one feature of the invention, the supply of power to
the heater plugs is effected through a pulse control circuit also
employed for shifting a closing valve in the fuel conduit.
According to another feature of the invention, said means for
cutting off the supply to the heating circuit are independent of
the indicating means and are controlled by the battery charging
circuit which includes a generator, a regulator and its associated
automatic switch.
Further features and advantages of the invention will be apparent
from the ensuing description with reference to the accompanying
drawings.
In the drawings:
FIGS. 1 and 2 show schematically two embodiments of the starting
device according to the invention, and
FIG. 3 shows a third embodiment of the invention in which the
cutting off means are independent of the indicating means.
Reference will first be made to FIG. 1. Note that the same
reference numerals designate equivalent elements in the three
Figures.
The whole of the starting device for a Diesel engine is supplied
with power by the battery 1 of the vehicle and the actuating
element actuated by the user is a lever 2, which may be constituted
by a key conventionally employed with a petrol engine. This lever
2, which has a rotary contact 3 in the form of a circular sector,
can occupy three positions :
a first stable position or "off" position, in which the rotary
contact 3 bears against only a single fixed contact 4 permanently
connected to the battery;
a second stable position or "on" position, in which the rotary
contact 3 interconnects the contact 4 and a second fixed contact
5;
a third unstable position or "starting" position, in which the
rotary contact 3 interconnects the contacts 4 and 5 and a third
fixed contact 6; return means (not shown) bias the lever or key 2
to the aforementioned second position.
The contact 5 is connected to a coil 7 of a first relay 8 actuating
a reversing switch 9 which interconnects the contacts 10 and 11
when no voltage is applied to the coil 7 and interconnects the
contacts 12 and 13 when a voltage is applied to the coil 7.
A pulse control circuit, brought into action by the shifting of the
reversing switch 9, is constituted by two reversing switches 14 and
15 and an electromagnet 16. The magnetic circuit of the
electromagnet closes on a ferrite element or permanent magnet and
the moving part 16a actuates, by its movement, the two reversing
switches 14 and 15.
Apart from its action on the reversing switches 14 and 15, the
electromagnet 16 also actuates a closing valve 17 in a conduit 18
of the fuel supply circuit of the vehicle.
When stationary, the reversing switch 14 is on a contact 19
connected to the contact 13 and the reversing switch 15 is on a
grounded contact 20. In operation, the reversing switch 14 is
placed on an insulated contact 21 and the reversing switch 15 is
placed on a contact 22 connected to the fixed contact 11. The
reversing switch 14 is connected to a coil 23 of a second relay 24
for bringing into action the heating. The coil 23 is grounded
through a bimetallic strip 25, a contact 26 having a delayed
opening, a resistor 27 and a contact 28 which is closed when the
engine stops and opens when the engine reaches a given speed. The
contact 28 can be actuated by any known means, as an alternator,
regulator oil pressure or other means.
The second relay 24 causes, when voltage is applied across the coil
23:
the closure of a switch 29 termed a maintaining switch, which
interconnects the contacts 30 and 31 connected in parallel with the
reversing switch 14, 19, 21;
the switching of a reversing switch 32 which opens the connection
33-34 between the electromagnet 16 and ground and interconnects the
contacts 35-36 closing the circuit between the contact 13 and the
electromagnet;
the closure of a switch 37 which interconnects the contacts 38 and
39 and supplies power to the heater plugs 40 through a ballast
resistor 41.
A bimetallic strip 42 is connected in parallel to the resistor 41
and is heated by the latter. Its contact 43 is opened when it is
cold and closes at the end of a period of time which is the longer
as the surrounding temperature is lower, this time being such that
the heating of the engine by the heater plugs 40 is sufficient. The
return of the current to ground is through a heating resistance 44
heating the bimetallic strip 25, through the contact 26, the
resistor 27 and the contact 28.
Connected in parallel through the resistors 44 and 27, is an
indicator lamp 45 which indicates the closure of the contact 43 and
consequently indicates to the driver that the heating is sufficient
and that the starter can be actuated.
In addition, an indicator lamp 46 between the switch 37 and the
ground could indicate that voltage is applied across the heater
plugs.
Closure of the starting contact 6 causes power to be supplied to
the coil of a relay 47 controlling a starter 48 and power to be
supplied to a coil 49 which is coaxial with the coil 23 of the
relay 24. The outputs of the coils 47 and 49 are permanently
grounded.
A connection 50 having a diode 51 is also provided between the
starting circuit and the contact 26 which grounds the coil 23 and
the bimetallic strips 42 and 25.
The device according to the invention operates in the following
manner:
When the engine is stationary, the various component parts are in
the positions shown in FIG. 1 and the closing valve 17 closes the
fuel conduit 18.
To start the engine, the driver must first place the lever 2 in the
normal operating position in which the contacts 4 and 5 are
interconnected by the sector 3. The following operations are then
automatically carried out:
current is supplied to the coil 7 of the first relay 8;
the reversing switch 9 is switched to close the connection
12-13;
current is supplied to the coil 23 of the second relay 24 through
the reversing switch 14;
the switch 37 supplying current to the heater plugs 40 and to the
indicator 46 is closed;
the reversing switch 32 is switched to interconnect the contacts 35
and 36. The electromagnet 16 then has a voltage applied thereto and
its armature 16a moves in a direction which opens the valve 17 in
the fuel conduit 18 and shifts the reversing switches 14 and 15. It
is therefore a brief pulse which passes through the electromagnet
16 since the return to ground is interrupted by the passage of the
switch 15 to the contact 22, which justifies the expression "pulse
control circuit" to designate this arrangement;
closure of the switch 29 which maintains the supply of power to the
coil 23 notwithstanding the switching of the switch 14 to the
insulated contact 21.
At the end of a variable period of time which depends on the
surrounding temperature and can be, for example 45 seconds for an
outside temperature of 20.degree. C., the heat given off by the
ballast resistor 41 causes the contact 43 to be closed which
simultaneously supplies current to the heating resistance 44 of the
bimetallic strip 25 and the indicator 45. The driver is then
informed that he can actuate the starter and he has for this the
time necessary for the resistor 44 to heat the bimetallic strip 25
until it opens the contact 26.
To actuate the starter, the driver shifts the lever 2 to the
unstable position which sends current by way of the contact 6 to
the relay 47 of the starter 48. During this, the coil 49 also has
voltage applied thereto and this guarantees that the switch 37
controlling the supply of power to the heater plugs 40 is
maintained in the closed position, even if the starter operates
when, or after, the contact 26 opens.
Further, as the current passes through the diode 51 it brings both
ends of the resistance 44 to the same potential which prevents it
from heating and thus delays the start of the time delay produced
by the bimetallic strip 25 to the moment when the action on the
starter ceases, should the engine fail to be started or a new
starting must be attempted.
Thus it is clear that the time delay produced by the second
bimetallic strip 25 is neutralized while the starter is
actuated.
The presence of the diode 51 constitutes a safety measure and
precludes any risk of accidentally supplying power to the relay 47
through the elements 37-42-43-44-26-50-47.
If the engine starts, the contact 28 opens and interrupts the
return to ground of the coil 23 and the relay 24 returns to its
position of rest and cuts off the supply of power to the plugs 40.
The presence of the switch or reversing switch 14, 19, 21 between
the switch 9, 12, 13 and the coil 23 of the maintaining circuit
closed by the switch 29, 30, 31, is not theoretically essential,
but this arrangement constitutes an additional safety measure
should the contact 28 accidentally close or fail to open. Indeed,
without this safety measure, the coil 23 could have voltage applied
thereto and the heating circuit supplied with power while the
engine runs normally which, bearing in mind the high power
consumption of the plugs 40, might result in the destruction of the
plugs and a rapid discharging of the battery.
If the driver does not actuate the starter during the period of the
heating of the bimetallic strip 25, the contact 26 opens at the end
of a predetermined period of time, for example of the order of 40
seconds, and cuts off the return to ground of the coil 23 which
returns the relay 24 to its position of rest and cuts off the
supply of power to the plugs 40.
When the engine is stopped by bringing the lever 2 to the "off"
position, the coil is no longer supplied with power and the switch
9 opens the connection between 12 and 13 and closes the connection
between 10 and 11. A current in the opposite direction to the
current for starting is sent to the pulse control circuit through
10-11-22-15-16-33-34, which has for effect to shift the moving part
16a in the direction to close the valve 17 in the fuel conduit 18.
Simultaneously, the reversing switches 14 and 15 are returned to
their contacts 19 and 20 respectively. The current is then cut off
in the whole of the circuit.
In the embodiment shown in FIG. 2, the main elements having the
same reference numerals as those shown in FIG. 1 are identical and
perform the same function.
Merely the pulse control circuit is slightly simplified. By so
choosing the characteristics of the relays 24 and 16 so that the
period of operation of the relay 24 is less than the period of
operation of the electromagnet 16, the reversing switch 32 of the
first embodiment and its contacts 33, 34, 35 and 36 can be
dispensed with. The electromagnet 16 is then directly supplied with
power by the reversing switch 14 whose contact 21a must be
grounded. A diode 52 must then be added to preclude shorting by the
grounding of the fixed contact 31 through the reversing switch 14
on the fixed contact 21a.
Apart from this slight difference in design, the operation of the
device is in every way identical to that of the first
embodiment.
In the embodiments described with reference to FIGS. 1 and 2, the
thermal time delay is supplied with power under the control of a
bimetallic strip at the same time as the means indicating to the
user that the heating is sufficient, so that in the event of
failure of this bimetallic strip, the heating is not automatically
interrupted, and this, bearing in mind the high power consumption
of heater plugs, is liable to discharge the battery.
The device shown in FIG. 3 overcomes this drawback.
In FIG. 3, all the elements already described and shown in FIG. 1
are designated by the same reference numerals and will not be
described in detail.
The description will therefore be limited to the part of the
diagram which concerns the automatic stoppage of the heating.
The reference C designates in the diagram the battery-charging
circuit having a generator 6 which may be a dynamo or, preferably,
an alternator and the associated regulator 61. This regulator
comprises, in the known manner, an automatic switch, or break
switch, which connects the generator to the battery when the
voltage of the generator exceeds that of the battery. A double
connection 62a, 62b between the generator and the regulator
corresponds to the connection between the armature winding and the
field winding respectively of the generator and regulator.
The coil 23 is connected in series with a thermal switch 63 having
a bimetallic strip 64 and connected to the regulator 61. The
heating resistance 65 of this switch is connected in the same way
as a battery-charging indicator 66 in such manner as to be
connected in parallel with the coil 23 after the closing of the
contact 12, 13 and the switching of the switch 14. This
battery-charging indicator is employed in the usual way, namely it
lights up as soon as the switch 2 is switched to its second
position and goes out when the regulator 60 furnishes a given
current.
The device operates in the following manner :
When the switch 2 is switched to the fixed contact 5, the relays 8
and 24 and the moving parts 16a are caused to operate in the manner
described with reference to FIGS. 1 and 2.
The heater plugs 40 are supplied with power through the switch 38,
37, 39 and the resistance 41 starts to heat the bimetallic strip 42
whose contact 43 is open at rest.
The resistance 65 is supplied with power through the switch 12, 9,
13 and starts to heat the bimetallic strip 64 of the switch 63
which is closed at rest.
The period for opening the switch 63 is chosen to exceed the period
of closure of the contact 43, these two periods being, for example,
respectively of the order of 2 and 1 minute respectively. When the
contact 43 is closed, the indicator 45 lights up and informs the
driver that he can actuate the starter by placing the switch 2 on
the fixed contact 6. The heating is maintained as long as the
charging indicator 66 remains lit up, that is, as long as the
engine has not been fully started. After the engine has been
started, the switch 2 is released and returns to the fixed contact
5. As there is no longer a return to ground through the regulator
61, owing to the actuation of the automatic switch, the indicator
66 goes out and the coil 23 is no longer supplied with power and
this results in the opening of the switch 38, 37, 39 and the
stoppage of the heating.
If the driver does not actuate the starter after the lighting up of
the indicator 45, the switch having the bimetallic strip 64 heated
by the resistance 65 opens after a predetermined period of time. As
the coil 23 is no longer supplied with power the heating stops.
The starting device according to the invention enables a motor of
the Diesel type which requires a prior heating, to be started in
the same way as a normal petrol engine. However, a period of time
necessary for the heating is allowed for between the two successive
moments of the lever or key when the engine is cold. If the engine
is warm, the period for heating is not necessarily allowed for and
it is possible to pass from the "off" position directly to the
"starting" position in which the heater plugs are in any case
supplied with current. As mentioned in the description and
explanation of the operation of the device, all the required
operations are carried out automatically and all safety
requirements are satisfied. In particular, a harmful prolonged
supply of power to the heater plugs or the stoppage of this supply
too soon after the user has actuated the starter, is avoided.
Further, with the arrangement shown in FIG. 3, the time delay
governing the duration of the heating which must precede the
starting of the engine and the time delay governing the stoppage of
the heating in the case of non-starting, are independent. This
precludes supplying power to the heater plugs for an excessive
period of time in the event of failure of the bimetallic strip
42.
An additional advantage of the last-mentioned arrangement is the
fact that the automatic switch included in the regulator 61 is of
much more precise operation than the previously provided
manocontact 28.
* * * * *