FR2559548A1 - INTERNAL COMBUSTION ENGINE WITH AN INTAKE MANIFOLD COMPRISING A HEATING DEVICE - Google Patents

Abstract

INTERNAL COMBUSTION ENGINE INCLUDING AN INTAKE MANIFOLD INCLUDING A HEATING DEVICE. THIS INTAKE MANIFOLD IS HEATED BY MEANS OF AN AUXILIARY CIRCUIT 10, A BYPASS CIRCUIT 8 OF AN INTERNAL COMBUSTION ENGINE COOLING SYSTEM WITH A FLUID IN A LIQUID STATE. THE CONNECTION OF THE SUPPLY AND RETURN DUCTS OF THE AUXILIARY CIRCUIT TO THE NEIGHBORHOOD OF THE DISCHARGE AND SUCTION SIDE OF A PUMP 17 AND THE CIRCULATION OF A FRACTION OF 20 TO 40 OF THE FLOW OF LIQUID CIRCULATING IN THE BYPASS CIRCUIT AND THE AUXILIARY CIRCUIT GUARANTEES A QUICK HEATING OF THE INTAKE MANIFOLD.

Description

Internal combustion engine with an intake manifold including a

  The present invention relates to a combustion engine

  with an intake manifold comprising a device

  heating system and a liquid cooling system comprising a pump, which comprises a main circuit

  equipped with an active cooling radiator at

  engine and a bypass circuit operating during the heating phase of the latter avoiding the radiator, and controlled by a thermostat, a

  auxiliary circuit for heating the intake manifold

  connection to the branch circuit.

  Tests carried out with a motor mounted in a vehicle, having a heated intake manifold, have

  shown that its ease of driving is considerably improved.

  improved by rapid heating of the intake manifold

  after the cold start. In addition, this heating of the

  intake has a favorable effect on the emission of gases

  exhaust and fuel consumption.

  In an intake manifold heater

  In a known manner (German Patent No. 22 35 857), an auxiliary shunt line connected to a bypass line is provided for heating. Because the junctions of the

  shunt line with the bypass line are remote

  of the cooling water pump and that, in addition, the flow of liquid flowing in the bypass line

  is not defined, the rapid heating sought may

  cilating be obtained with this device.

  Accordingly, the object of the invention is to

  sea an intake manifold heater of internal combustion engine so that this manifold

  In the heating phase, the heating

  fage and, after obtaining the operating temperature

  of the engine, has a temperature that facilitates good

  of the latter. To achieve this objective according to the invention

  the auxiliary circuit with return and return lines is connected to the deflection circuit, preferably in the vicinity of the discharge and intake ports of the pump mounted in a main circuit and branch circuit, the proportion of

  total liquid flow, circulating in the derivatization circuit

  and the auxiliary circuit, which runs through the auxiliary circuit is 20 to 40% and a three-way thermostat is placed in the auxiliary circuit, thermostat which, after obtaining the operating temperature of the engine,

  diverts the flow of liquid circulating in the

  to the main circuit until a

  residual quantity used for partial heating of

intake.

  The main advantages obtained by the invention

  in that, by connecting the return and return lines of the auxiliary circuit with the coolant pump and the proportion of the flow of liquid

  circulating in the auxiliary circuit, we obtain a heating

  Optimized firing of the intake manifold during the heating phase. In addition, after obtaining the operating temperature of the motor, the three-way thermostat ensures that the flow of liquid flowing through the auxiliary circuit is diverted to the main circuit until a residual amount is obtained for partial heating. of the intake manifold, so that the intake manifold has, even for this state of operation of the internal combustion engine, a temperature facilitating the running of the engine, because the partial heating improves the emission of gases from exhaust, dynamic behavior

  and the consumption of the engine, in said state.

  We will now describe in more detail an example of non-limiting embodiment of the invention, shown in the accompanying drawing of which:

  Fig. 1 is an oblique view of a combustion engine

  internal arrangement with the collective heating device

intake manifold according to the invention;

  Fig. 2 is a diagram with which the function

  of the heating device of the intake manifold

sion is described.

  An internal combustion engine 1 represented schematically

  it comprises an engine block 2 which comprises an intake manifold 3. Other details of the internal combustion engine,

  such as additional assemblies, the electrical installation

  the fuel system, are not

  sented. The engine block 2 is connected to a cooling system

  4 which comprises a radiator 5.

  The intake manifold 3 comprises a heating device 6 connected to the liquid cooling system 4. The system 4 comprises a main circuit 7 and a bypass circuit 8. The main circuit 7 acts at the temperature

  operating the internal combustion engine 1; the cir-

  bypass 8 acts during its heating phase,

  that is to say avoiding the radiator 5. The derivation circuit

  8 is controlled by means of a thermostat 9. In addition, this bypass circuit 8 is connected to an auxiliary circuit 10 which comprises a feed line 11 and a return line 12 which are connected on the one , respectively 14,

  intake manifold 3 and, on the other, a short

  A, therefore, close to the discharge and inlet

  16 of a pump 17. The pump 17 is mounted in the con-

  pick 18 which is part of both the main circuit 7 and

branch circuit 8.

  The auxiliary circuit 10 is formed in the area of the

  intake manifold 3, for example, by annular

  incorporated film 19 (shown in phantom) and

  door 20 a three-way thermostat 21 which opens into a pipe 22. The thermostat 21 can be incorporated in the intake manifold 3. The pipe 22 is connected at 23 to

main circuit 7.

  During the operation of the internal combustion engine 1 during the heating phase, the thermostat 9 controls the bypass circuit 8, so that the flow of liquid circulated by the pump 17 flows in the direction B indicated by the dashed lines and penetrates

at 24 in the engine block 2.

  At the same time, the intake manifold 3 is

  fluid fluid in the liquid state via the feed line 11, so that the manifold 3 is heated by means of the annular pipe 19 of the heater 6; at 14, the fluid enters the return line 12 again. The fluid 25 passing through the engine block 2 returns to the

  branch circuit 8 by an outlet pipe 26.

  From the total flow of liquid flowing in the bypass circuit 8 and the auxiliary circuit 10, a fraction of 20 to 40% flows in the auxiliary circuit, which is

  can get by choosing the straight sections in the system

  duct system (in particular of the intake manifold

3) of the auxiliary circuit 10.

  When the engine operating temperature 1

  has been reached, the thermostat 9 prohibits the circuit

  8 and the fluid in the liquid state circulates according to

  direction C indicated in phantom in the main circuit.

  pal 7, the fluid now passing through the radiator 5. In this operating state of the engine, the thermostat 21 is

  also blocking in the direction of the intake manifold

  sion 3, so that the essential fraction of the flow of

  auxiliary circuit liquid 10 flows in accordance with

  D symbol symbolized by dots. By line 22, the essential fraction of the liquid flow reaches the circuit

principal 7.

  A fraction, of about 10%, of the liquid flow of the auxiliary circuit 10 also passes through the intake manifold 3, so that a partial heating is obtained.

  3. To achieve this, it is expected that

  on the closing valve of thermostat 21

  in the direction of the intake manifold, open

  what we did not represent.

  The diagram of FIG. 2 represents the heating rate of a known intake manifold and the intake manifold 3 according to the invention. The temperature t was plotted on the ordinates and the time s on the abscissa. Curve E indicates the heating rate of the intake manifold

  until it shows the operating temperature

  desired 86 C, which takes nine minutes.

  By cons, already after four minutes, the intake manifold 3 according to the invention reaches this operating temperature, as indicated by the curve G.

Claims (1)

CLAIM   Internal combustion engine having an intake manifold with a heater and a liquid cooling system having a pump, which includes a main circuit provided with a cooling radiator   active at the operating temperature of the combustion engine   internal circuit and a bypass circuit operating during   of the heating phase of the latter, avoiding radia-   an auxiliary circuit for heating the collector   the intake circuit connecting to the branch circuit,   in that the auxiliary circuit (10) comprises   go (11) and return (12) is connected to the cir-   preferably bypassing the discharge (15) and inlet (16) connections of the pump (17) mounted in a pipe (18) of the main circuit (7), in that the   proportion of the total liquid flow circulating in the   shunt (8) and the auxiliary circuit (10), which traverses the auxiliary circuit (10) is 20 to 40%, and   a three-way thermostat (20) is placed in the cir-   auxiliary cooking (10), a thermostat which, after obtaining the operating temperature of the internal combustion engine,   diverts the flow of liquid circulating in the   (10) to the main circuit (7) until a residual quantity is intake manifold (3).