FR2473119A1 - DEVICE FOR STARTING AND STOPPING AN INTERNAL COMBUSTION ENGINE WITH INJECTION AND AIR COMPRESSION IN VEHICLES - Google Patents

Abstract

THE INVENTION RELATES TO A DEVICE FOR STARTING AND STOPPING AN INTERNAL COMBUSTION ENGINE WITH AIR INJECTION AND COMPRESSION IN VEHICLES. THE DEVICE INCLUDES A MAIN SWITCH 12 WHICH INCLUDES SEVERAL SWITCHING BLOCKS 12.1, 12.2, 12.3 MOVABLE TOGETHER IN DIFFERENT SWITCHING POSITIONS. WITH EACH BLOCK IS ASSOCIATED AT LEAST ONE BYPASS OF ELECTRIC CIRCUIT 13, AND A RELAY CONTROL UNIT 17, 19, 20, 22 WHICH CAN BE EXCITED DEPENDING ON THE POSITION OF THE SWITCHING BLOCKS OF THE MAIN SWITCH 12 OR THE POSITION OF SWITCHING OF AN INVERTER SWITCH 21 IN VIEW OF THE FORMATION OF DETERMINED BYPASSES OF THE ELECTRICAL CONTROL CIRCUIT 13, THE INVERTER SWITCH 21 BEING CONTROLLED ACCORDING TO THE OIL PRESSURE. THE DEVICE FURTHER INCLUDES A 32WAY DISTRIBUTOR 1 INSERTED IN A PNEUMATIC CONTROL CIRCUIT 10 WHICH CONTROLS AT LEAST ONE COMPRESSED AIR CYLINDER COUPLED TO AN INJECTION PUMP REGULATOR.

Description

The present invention relates to a device

  starting and stopping of an internal combustion engine with injection and compression of air in

  vehicles by means of a main switch action-

  born by a key, in which the main switch is in an electrical circuit that contains a

  inverter switch controlled according to the pres-

  a solenoid of a 3/2-way distributor, and having a pneumatic control circuit in which at least the 3/2-way distributor is located.

  which controls at least one air cylinder

  awarded, which is coupled to a

  jection according to the German patent application DE-OS

2,757,242.

  A device of the aforementioned type is known from the German patent application DE-OS 2 757 242,

  in which on the one hand the starting of the combustion engine

  internal injection is carried out according to

  obtaining a determined oil pressure and

  on the other hand, the shutdown of the internal combustion engine

  This is done in such a way that the compressed air cylinder, for example, for regulating the injection pump regulator, is not supplied with pressure in a "Stop" position after the engine has been stopped. In this device however, when a fault in the electrical control circuit, the engine can be started, a stop of it can be done with an additional 3/2 way distributor. The device

  known does not fulfill all the security functions

  rite; in particular it is possible that in the case of a fault of the electrical control circuit, the motor

  put into operation without determining the oil pressure

  In the event of a drop in the oil pressure, an automatic engine shutdown is not guaranteed and finally an unintentional start of the engine can not be prevented safely.

by rculeL: ent on a slope.

  The present in-ention therefore has

  purpose of improving a device of the type

  cited in order to avoid the aforementioned disadvantages indicated This problem is, according to the invention, solved

  in that the main switch has several

  Siblings of switching which are movable

  with others in different

  mutation, by the fact that at each switching block

  is associated with at least one derivation of the

  electrical supply, and the fact that a set of

  relay-relay is provided which can be activated according to

  tior of the position of the switching blocks of the

  main and / or switching position

  of the inverting switch for the formation of

  determined boundaries of the electrical control circuit

  than. Other features of the invention will become apparent on reading the description which follows. Thanks to the device according to the invention, it is obtained that even in the case of a fault of the electrical control circuit, the internal combustion engine injection can not be put in ugly using the

  main switch. In the case of a defect in the cir-

  cooked electric control, unlike the device

  previously known, a repair is absolutely necessary.

  necessary because the engine can not be started.

  It is further prevented that the starter can be put

  in operation in case the engine rotates. The start

  motor can only be performed when a pressure

  sufficient oil is present. In addition, the

  is automatically stopped in the event of a fall

2473119.

  or a disappearance of the oil pressure. Finally, one -

  unintentional starting of the engine as a result of

on a slope is excluded.

  The device according to the invention comprises a main switch with a plurality of switching blocks, preferably three switching units, so that specific branchs of the control circuit play the control circuit role as a function of the switch position. and provide the desired security functions and arrangements.

  A preferred embodiment of the arrangement

  of the invention is described hereinafter using

  drawing for the purpose of explaining other

teristics.

  The single figure shows schematically

  the electrical and pneumatic control circuit of the dis-

  positive embodiment of the invention, the pneumatic control circuit

  as is known from the patent application

  DE-OS 2 757 242. The pneumatic control circuit

  There is a 3/2-way electromagnetic distributor 1 and a 3/2-way electromagnetic distributor 3 actuated by a foot switch 2 for the engine brake. Both 1 and 3, 3/2 way distributors

  are in communication via a channel

  4 with a cylinder of compressed air 5 and another cylinder of compressed air 6, the cylinder of which can actuate a regulator 7 of an injection pump 8. The cylinder of compressed air 6 is provided for the operation of an exhaust valve 9. The pressure line 4 is in communication at a point À with

atmospheric air.

  The mode of action of the pneumatic control circuit, which is designated as a whole by the reference number 10, is as follows: When an electromagnet is activated

  It is the distributor of 3/2 way 1, the link of the

  compressed air 4, regardless of the posi-

  Dispenser 3, with the To point is interrup-

  by the distributor 1, so that compressed air is delivered to the cylinders 5 and 6. The regulator

  7 is thus brought into a "Stop" position by the cy-

  compressed air 5, while simultaneously

  exhaust valve 9 is brought into the closed position

  nted. When the electromagnet 11 is deactivated, the pressure in the compressed air line 4 is eliminated via the point A, so that the cylinders 5 and 6 resist the pressure, which allows a moving the regulator 7 in the position

  BL (no load) or VL (full load); simultaneous-

  the exhaust valve 9 is brought into the position

"open".

  Activation of the electromagnet 11 is

  to shut down the engine according to a command

  appropriate of a main switch 12, as well as

is further described below.

  The device according to the invention comprises an electrical control circuit which acts so that according to a determined position of the main switch 12, the electromagnet 11 of the distributor 1 is excited or not. According to the invention, it is provided that the main switch 12 has a plurality of switching blocks. In the illustrated embodiment,

  three switching blocks 12.1 to 12.3 are provided,

  associated with a group of contacts, which are either partially open or in communication with branches of the electrical control circuit 13.

  switching blocks 12.1 to 12.3 of the main switch

  pal 12 are switched together and connected to the p8le (+)

  -5 c-tune battery-. At switching block 12.1 are associated

2473119 ..

  three contacts 14.1 to 14.3 whose contacts 14.1 and 14.2 are open or so called "in the air", while the contact 14.3 can form via the switching block 17.1 of a relay 17 a supply circuit for A starter 18. The switching block 12.2 has two open contacts 15.1 and 15.2 and a third contact 15.3 which is connected to a contact c of a relay 19. When the switching block 19.1 is switched to the contact c between the contact 15.3, via the switching block 19.1 and the relay 19, a current path

  is formed towards the other pole (-) of the bat-

  series. At the switching block 12.3 of the main switch 12 are associated three contacts 16.1, 16.2 and

  16o3. Contact 16.1 is in connection with a con-

  tact c a relay 20, whose switching block 20.1 can be placed between the contact c and a contact d. The switching block 20.1 is further connected to the switching block 19.1 of the relay 19. In addition, the contact

  16.1 is connected to a contact b of an inverting switch

  21, which operates according to a pressure

  of oil, whose contact b is connected to a compressor block

  mutation 22.1 of a relay 22. The contact 16.2 and the con-

  16.3 tact are connected via a bridge 23

  and are connected to a switch contact a

  21. The switching block 21.1 of the switch

  inverter 21, which can be switched between

  tacts a and b depending on the existing oil pressure

  te, is in turn connected with a terminal of the relay 22 and the electromagnet 11. The other terminal of the relay 22 and the electromagnet 11 are connected to the pole (-) of the battery. At the switching block 22.1 of the relay 22 are associated two contacts c and d. The relays

  17, 19, 20 and 22 provided in the electrical control circuit

  have a contact c and d associated with their

  switching block, the switching blocks of the re-

  lais being connected to the contact c when the relay

  In the non-energized state of the relays, the switch block concerned is connected to contact d. The contact c associated with the switching block 22.1 of the relay 22 is connected with the pole (+). Relay 20 is

  parallel to the electromagnet 11 of the

  scorer 1 and is thus simultaneously energized in the case of a command of the electromagnet 11. Both

  Relays 17 and 19 are according to the figure mounted in parallel.

  between them, the link between the two relays 17 and

  19 being connected to the switching blocks 19,1 and 20.1.

  The switching blocks 12.1 to 12.3 of the main switch 12 can thus take three different switching positions. The switching position associated with contacts 14.1, 15.1 and 16.1

  corresponds to the "Stop" position of the main switch

  pal, the position determined by the contacts 14.2, 15.2

  and 16.2 at the position "Travel" and the position de-

  ended with contacts 14.3, 15.3 and 16.3 at the

"Startup" section.

  The mode of action of the device according to

  The invention is explained below using various switching operations. At the same time, the different

  current paths of the electrical control circuit

  are described in association with the states of

relay operation.

Car park: -

  The switching blocks 12.1 to 12.3 take

  the position corresponding to the "Stop" position. The switching blocks 12.1 and 12.2 thus have no function during the formation of the control circuit

  13. The switching block 21.1 of the in-

  reversing switch 21 is switched on contact a, because no oil pressure exists. The relays 17, 19, 20 and 22 are not excited, therefore their switching blocks are connected to the contact d. So9 distributor 1 electro-magnet is not excited

  and the regulator 7 is in the ML position. simul-

  momentarily the circuit of the starter 18 is interrupted.

  Unintended rolling start:

  The main switch 12 takes the

  "Stop" position. As a result of the vehicle rolling, the

  engine is running and engine oil pressure is pre-

  This is why switching block 21.1 is connected to contact b. So, by the contact 16.1 by

  via the contact b of the reversing switch

  21, a circuit is formed by means of the electromagnet II up to the pBle (-) and the switching blocks of the relays 17, 19, 20 are switched on the contacts c. As the electromagnet 11 is energized, the distributor 1 responds and the regulator 7 is moved to the "Stop" position. The starter 18 is not actuated because the switching block 12. 1 of the switch

  main 12 is not on contact 14.3.

  Getting Started: The main switch is in the "Move" position with the engine off. The vehicle is also stopped. so no oil pressure

  motor exists and the switching block 21.1 of the in-

  reversing switch 21 is switched on contact a.

  In this state, the switch block 12.3 is on the contact 16.2, therefore a circuit from the (+) pole via the switching block 12.3, the contact a and the switching block 21.1 is closed and causes the excitation of the electromagnet 11

  as well as all relays 17, 19, 20 and 22. The

  gulator 7 thus takes the "Stop" position. The start

  18 is not driven because the circuit going to

  starter 18 on contact 14.3 is open.

Start of start:

  The main switch 12 takes the

  "Startup" section. Switching blocks 12.1,

  12.2, 12.3 are respectively switched to the con-

  Tacts 14.3, 15.3, 16.3. The switching block 12.3 establishes a current path through the

  contact a and the switching block 21.1 of the inter-

  inverter switch 21, which is still in the

  in the absence of pressure, until the electro-

  magnet 11. Thus, simultaneously all the relays 17, 19, 20 and 22 are excited, that is why the associated switching blocks of the relays are switched on their contacts c. This causes a circuit towards the

  starter 18, since the switching block 12.1 is

  transferred to contact 14.3 and switching block 17.1

  Relay 17 on contact c. At the same time, the

7 takes the "Stop" position.

Start-up:

  Through the process described above,

  start-up goal ", the starter 18 rotates, so that an engine oil pressure is generated and that the switching block 21.1 of the inverter switch 21 is switched on the contact B. Thus, the connection between the pale (+), via the switching block

  12.3, towards the electromagnet 11 is interrupted

  the relays 20 and 22 fall back, so that their switching blocks 20.1 and 22.1 are switched on their contacts d. However, the switching block

  12.2 establishes a circuit from the (+) pole through the

  the switching block 19.1 (position c)

  than at the point of connection 24 between the two relays 17 and 19 and thus via these relays or

  their relay coils to the (-) pole of the bat-

  series. Thus the switching blocks 17.1 and 19.1 are maintained in the switching position c, that is to say

  say that relay 19 is in a self-sustaining state

  maintained, while distributor 1 is not

  mandé, so that the starter 18 continues to rotate.

  The regulator 7 can thus be moved from the position

LL in the VL position.

  The internal combustion engine with injection turns (started):

  The main switch 12 takes the posi-

  "Move" as the engine is running. The vehicle

  it itself is stationary or moves in this state. Due to the engine oil pressure, the block

  Switching 21.1 takes the position b. All the re-

  lais 17, 19, 20 and 22 are de-energized (position d), and

  the regulator 7 takes the position LI or VL. The start

reur 18 is not actuated.

  Starting in the case of the running engine: The main switch is folded into the "start" position, while simultaneously the engine

  turned. The vehicle may be stationary or moving

  cer. Due to the engine oil pressure, the switching unit 21. 1 of the reversing switch 21 is switched on the contact b, while all the relays 17,

  19, 20 and 22 as well as the electromagnet Il of the

  1 are de-energized. Regulator 7 takes the position

  LL or VL. Thus, in the case where the engine is running,

  startup operation is not possible.

  Engine running, engine oil pressure disappearing

  When the engine is in operation

  10. the main switch 12 is in the "travel" position, the engine oil pressure

  down or disappear, the vehicle being stationary

  re or moving, the switching block 21.1 of the inverter switch 21 is switched on the contact a. Thus, between the pole (+) of the bat-rie, the switching block 12.3, the contact 16.2, the contact a and the

  switching block 21.1, is established a path of

  in the direction of the electromagnet 11 of the

  1. The distributor I answers and allows to bring

  the regulator 7 in the position. "Stop". An emergency stop

  as a result of lack of oil is thus achieved.

  Stopping the internal combustion engine with injection: In order to stop the engine, the switch:

  main unit 12 is brought to the "Stop" position. The.

  engine is running while the vehicle is stationary.

  An oil pressure is thus still present, it is - ;-

  that is, the switch block 21.1 of the switch -

  inverter.21 is still switched to contact b.-

  Relays 17, 19, 20 and 22 are energized, and by

  12.3 switching block, contact -

  16.1, contact b and switching block 21.1, is -

  established a current path towards the electromagnet 11, so that the regulator 7 is brought into:

  the "Stop" position and the engine is stopped. The interruption

  inverter 21 is then switched, when the engine is & stopping in position a and allows to ventilate the pneumatic system; the electrical installation

is also cut off.

  Thanks to the device according to the invention, a

  towing the vehicle is also possible.

Towing:

  With a view to towing, the main switch

  pal 12 is brought into the "Move" position, the block

2473119.

  If the oil pressure increases due to the displacement of the vehicle or the rotation of the engine, the switch 21 is switched to the contact a due to a lack of oil pressure. switched on the contact b, so that the regulator 7 is movable between the positions

LL and VL.

  In order to operate the main switch 12 in the three possible positions, a key is used as in the case of the German patent application DE-OS 27 57 242, as it is known per se. Thanks to the device according to the invention, it is thus ensured that a starting of the engine can not be

  performed only in the presence of oil pressure. The ar-

  the motor is automatically

  an oil pressure drop and an inverted

  The rolling of the engine on a slope is also

  impossible. A defect in the system of

  electrical connections, as a result of the rupture of a pipe, prevents the engine from starting. A bet

  in operation of the starter 18 in the case of the rotation of the -

  engine is prevented. Another advantage also lies in the fact that during the running of the motor, a stop can not occur, even when for example during the movement a cable breaks or another defect

  appears in the electrical system.

  Advantageously, the connections 26 and 27 are arranged as close as possible to the electromagnet 11 of the distributor 1, since a defect appearing between

  these connections do not prevent the operation of the starter.

  Finally, it is essential that the relay 19

  is self-excited in the "Start" position of the

  principal 12, because without self-excitation of this re-

  lais 19, the relay 17 would fall, that is to say that the switching block 17.1 would be switched to the contact

  d, so that the starter 18 would be cut off and that

  oil pressure will not build up. To assure

  a safe starting of the engine, the starter 18 must, however,

  to stay in action a little longer.

  The following table is a summary of the

  switching arrangements described above in association with

  with the operating states of the vehicle or

of the motor.

Surgery

of

Parking I Parking Position 1

* commutative

principal

cipal Stop

Function-

engine

station-

  Function. stationary vehicle Pressure

to Hui

  the Relay + glue-off engine

++ self

maintained 22 20I19 He

_ _ _ _

Distractor 3/2 way

Position Démar-

pump

injections

LL reunion Fen sez vice off

served-

  this 10 2 Start-Stop turns + + + + ++ + St

ge invokes

lontary t -

by rou-

  lement _ 3 Commuta- Displa- station- station - + + + + + St

i - + + + + + St -

in nary

seen from-

  marrage ..._ _ _._ 4 Start Start-turn station - + +++ + + St + start up

!_ _ _not- - - _-

  Démar- Démarra- rotates Station- + - - + + - L VL + rage ge naire

. ... ,AT... ... __.. .,

  6 Mloter Move- rotate stationo + _ IL ... I VL start or move Note l I j_ l I L TABLE (Continued) 0p'.ration

e4

tation

7 Demonstration

Engine running Position

commutative

principal

cipal

Démarra-

ge

Function-

  The engine rotates and turns. vdhicula station or moves

1

if we

to Hui

  the engine +1 Relay + glued - unstuck

++ self

maintained 22 20 _m scorer 3/2 way

19 17 1

- I- -

pump

injections

tion

n Dmarmar

reur + in ser vice - out

served-

this 10

LL ... VL

  Note when rotating the engine commissioning

starting

impossible

ble SS - arê

  8 Motor Move- turns station - + + + + + St - Stops

  rotates or gences by pressure moves lack of oil

absent ___

  9 Engine Stop rotates stat. still + + + + + ST is 1 stopped _ _ _ _ - _

  _____________________________ ___________________________ _________________________________________________ ___________________________________________ I____________________________________

  rl. 4.- J Ab% 0 Towing: 1. Start first without oil pressure, as 4

  2. Towing after oil pressure setting, such as 6.

f Diú, rtri-ll., ositioi

Claims (4)

REVENTDICATOIONS   1) Starting and stopping device   an internal combustion engine with injection and   air pressure in vehicles by means of a   main actuator operated by a key, in which the main switch is in a circuit   electrical system which contains a   according to the pressure and an electro-   magnet of a 3/2 way distributor, and having a pneumatic control circuit in which at least the 3/2 way distributor is located and which controls at least one compressed air cylinder, which is coupled to an injection pump regulator characterized in that the main switch (12) has a plurality of   switching blocks (12.1, 12.2, 12.3) which are de-   can be placed together in different   in that each switching block is associated with   at least one branch of the electrical circuit (13), and that a relay control assembly (17, 19, 20, 22) is provided, which can be activated depending on the position of the switching blocks of the switch (12) and / or the switching position of the inverting switch (21) for the formation of   specific branches of the electrical control circuit that (13).   2) Device according to claim 1, characterized in that the relay control assembly   comprises a first relay (17) whose block of communication   tation - (17.1) is in the circuit going Marror (18).   3) Device according to claim 2, characterized in that in series with the relay (17) in the circuit of the starter (18) is mounted a   second relay (19) which is self-maintained during the de-   starting of the internal combustion engine with injection in order to keep the first relay (17) in the excited state. 4) Device according to claim 5, characterized in that the relay control assembly comprises a third relay (20), which is in parallel on the electromagnet (11) of the 3/2 way distributor (1) , whose switching block (20.1) is connected in series with the switching block (19.1) of the second relay (19).   Device according to one of Claims 1 to 4, characterized in that a fourth relay (22) is connected in parallel to the electromagnet (11)   the 3/2-way distributor (1) and form in case of absence   this from the engine oil pressure a circuit in di-   of the switching block (20.1) of the third re-   lais (201 so that the first and second relays (17, 19) are energized and a starter circuit (18) is closed.   6) Device according to one of the claims   1 to 5, characterized in that the main switch   cipal (12) comprises three switching blocks (12.1, 12.2, 12.3), in that each switching block is associated with three contacts (14.1, 14.2, 14.3, 15.1, 15.2,   15.3; 16.1, 16.2, 16.3), in that a switching block   tion (12.1) is planned in order to close a circuit going   to the starter (18), in that another switching block   tion (12.2) is provided for the formation of a cir-   cooked via the first and second relays (17, 19), while a third switching block (12.3) is provided for controlling the 3/2-way distributor (11) via the inverter switch (21) Pressure function.