FR2776707A1 - Motor vehicle heat exchange management system - Google Patents

Abstract

The vehicle heat exchange control has a closed coolant circuit with a branch (5) with a coolant/oil heat exchanger (6), and a second branch (7) for the passenger compartment air heater (8). The coolant flow is via a computer- controlled valve (10) which has one position in which the coolant is circulated round the engine (2) alone for faster warming-up. In other positions the heated coolant is fed to the radiator and passenger compartment heater.

Description

The present invention relates to a system for

  management of heat exchanges in a motor vehicle.

  The proper functioning of a combustion engine

  internal of a motor vehicle requires a

  efficient cooling, in particular to reduce consumption

  fuel and pollutant emissions.

  To this end, the internal combustion engine

  carries a closed loop circuit for circulation of a fluid

  which is fitted as standard with a heat pump

  fluid dragging and a heat exchange radiator sized according to the heat exchange to be carried out

  for efficient engine cooling.

  To improve engine operation, the

  cooling circuit can also include, in pa

  parallel with the radiator, a coolant exchanger

  oil, connected to the engine lubrication circuit.

  It is also known to have, in parallel with the radiator and the exchanger, an air heater allowing

  to heat the passenger compartment of the vehicle.

  The system also includes means for orienting

  tion of the coolant in the corresponding circuits

heavy.

  However, with the systems used up to now,

  feels, the increase in engine cooling performance is most often at the expense of heating

  passenger compartment and therefore passenger comfort.

  The object of the invention is to avoid these inconveniences.

  by proposing an optimized management system for

  heat exchanges so as to ensure a rise in temperature

  rapid erasure of the engine, which reduces fuel consumption and pollutant emissions, while ensuring

  heating the passenger compartment as quickly as possible

  hicle. The subject of the invention is a system for managing heat exchanges in a motor vehicle, of the type comprising: - a closed loop circulation circuit

  of a coolant from an internal combustion engine

  dull and comprising in series a pump for driving the

  coolant and a heat exchange radiator

  that, - in parallel with said radiator, a first

  branch circuit fitted with a coolant exchanger

  oiling, connected to the lubrication circuit of said mo-

  tor and a second branch circuit provided with an air heater with a heating system for the passenger compartment of the vehicle,

  - and means for orienting the return fluid

  cooling in said circuits, characterized in that the means for orienting the

  cooling are formed by a valve including in particular

  a closed position for the circulation of the fluid

  cooling in the internal combustion engine

  for a fixed time to ensure a rapid rise in

temperature of said motor.

  According to other characteristics of the invention: - the valve also includes a position for closing the circulation of the cooling fluid

  in the radiator and the exchanger and opening the circulation

  lation of the fluid in the engine and the air heater, a posi-

  closing the circulation of the fluid in the radia-

  tor and opening of the circulation of this fluid in the

  engine, exchanger and air heater and inter-

  mediaries of circulation of this fluid in said circuits, the valve is a valve with linear actuator and comprising an inlet channel for the cooling fluid coming from the engine and three outlet channels for said fluid

  cooling respectively to the radiator, the sample

  heater and air heater, - the valve is controlled by a computer according to the operating parameters of the engine and the

  passenger compartment heating control system.

  The invention also relates to a system for managing heat exchanges in a motor vehicle,

  of the type comprising a closed-loop circulation circuit

  tion of a coolant from an internal combustion engine and comprising in series a pump for driving the

  coolant and a heat exchange radiator

  that, - in parallel with said radiator, a first

  branch circuit fitted with a coolant exchanger

  oiling, connected to the lubrication circuit of said mo-

  tor and a second branch circuit provided with an air heater with a heating system for the passenger compartment of the vehicle,

  - and means for orienting the return fluid

  cooling in said circuits, characterized in that the means for orienting the cooling fluid are formed by a valve controlled by a computer as a function of the operating parameters of the

  engine and home heating control system

  key. According to other characteristics of the invention: - the valve notably includes a position for closing the circulation of the cooling fluid

  in the internal combustion engine for a specified time

  mined to ensure a rapid rise in temperature of said mo-

  valve, - the valve also includes a closed position for the circulation of the coolant

  in the radiator and the exchanger and opening the circulation

  lation of the fluid in the engine and the air heater, a posi-

  closing the circulation of the fluid in the radia-

  tor and opening of the circulation of this fluid in the

  engine, exchanger and air heater and inter-

  mediaries of circulation of this fluid in the circuits, - the valve is a valve with linear actuator and comprising an inlet channel for the coolant coming from the engine and three outlet channels for said fluid

  cooling respectively to the radiator, the sample

geur and the air heater.

  The invention will be better understood using the

  description which follows, given solely by way of example

  ple and made with reference to the accompanying drawings, on the-

  which: - Fig.l is a schematic view of a heat exchange management system, according to the invention, in a motor vehicle, - Figs. 2A to 2C are schematic sectional views showing the different positions of the means for orienting the cooling fluid in the circuits

  of the management system according to the invention.

  In Fig. 1, there is shown schematically

  a heat exchange management system in a vehicle

  automobile and which includes a circuit 1 in an iron loop

  circulation of a cooling fluid of a mo-

  internal combustion torch designated as a whole by the

  reference 2 and comprising, in a conventional manner, a cy- block

lindre 2a and a cylinder head 2b.

  The circuit 1 also includes, in series, a pump 3 for driving the coolant and a

heat exchange radiator 4.

  Thus, the cooling fluid constituted

  for example by water is driven by pump 3 and circ-

  runs around the hot parts of the cylinder block 2a and the

cylinder head 2b.

  The coolant is charged with heat

  laughs and it is then cooled in the radiator 4 o it exchanges these calories with the ambient air, before returning

to motor 2.

  In addition, the heat exchange management system comprises, in parallel with the radiator 4, on the one hand, a first branch circuit 5 provided with an exchanger

  6-coolant-oil, connected to the lu- circuit

  brification, not shown, of the motor 2 and, on the other hand, a second branch circuit 7 provided with an air heater 8

  a vehicle interior heating system.

  The exchanger 6 makes it possible, on starting the engine 2, to accelerate the rise in temperature of the oil used

  to lubricate this engine and then regulate this temperature

  cross out. Finally, the ther-

  miques comprises means 10 for orientation of the coolant

  cooling in circuits 1, 5 and / or 7.

  Means for orienting the coolant

  are formed by a valve 10 which has an inlet channel 11 for the coolant coming from the engine.

  2 and three outlet channels 12, 13 and 14 of said coolant

  cooling respectively to the radiator 4, the sample

geur 6 and the heater 8.

  The valve 10 is preferably constituted by a

  valve comprising a linear actuator 20 whose displacements

  are provided by a control member 15 formed by

  example by an electromagnet or any other suitable device

prayed.

  The linear actuator 20 comprises a first or-

  shutter gane 21 whose front face forms a first valve 21a intended to cooperate with a valve seat lla formed on the inlet path 11 of the cooling fluid

  coming from engine 2 and the rear face of which forms a

  valve 21b cond intended to cooperate with a valve seat 13a closing the passage of the coolant in the

radiator 4 and in the exchanger 6.

  In addition, the linear actuator 20 carries a

  cond shutter member 22 forming a third valve of the

  keen to cooperate with a valve seat 14a for closing off

  the circulation of the coolant in the radia-

tor 4.

  The third valve 22 is mounted displaceable in translation on the rod of the linear actuator 20 and is

  held in abutment against a stop 23 by an elastic member

  than 24, such as a compression spring.

  As shown in FIG. 2A, valve 10

  has a closed position by applying the first

  mier valve 21a on the valve seat l1a which prevents the circulation of the coolant in the internal combustion engine 2 for a determined time to ensure

  a rapid rise in temperature of said motor 2.

  As shown in Fig. 2B, the valve 10 also includes a closed position by applying the second valve 21b to the valve seat 13a which prevents the circulation of the coolant in the radiator 4 and the exchanger 6 and allows the circulation of this fluid in

the motor 2 and the air heater 8.

  The valve 10 also comprises, as shown in FIG. 2C, a closed position by applying the third valve 22 to the valve seat 14a which prevents

  the circulation of the coolant in the radia-

  tor 4 and allows the circulation of this fluid in the engine

  2, the exchanger 6 and the air heater 8.

  In the middle position of valve 10, shown

  felt in FIG. 1, the coolant circulates

in all circuits 1, 5 and 7.

  Between these different positions, the valve 10 can take a whole range of intermediate positions so as to selectively increase or decrease the flow rate of the

  coolant in one of circuits 1, 5 and 7.

  According to a preferred embodiment shown

  felt in FIG. 1, valve 10 is controlled by a calculation

  tor 30 which acts on the control member 15 of this valve 10. The computer 30 controls the operation of the engine 2 and has information representative of this operation such as for example the engine speed, the load, the temperature of the gases at l intake, temperature

  coolant, oil temperature.

  To this end, the computer 30 receives the various

  information rents from sensors 31 arranged for example in the cylinder head 2b of the internal combustion engine 2,

  and circuits 5 and 7. Knowledge of the other parameters

  very, like for example the temperature of the coolant

  smoothing in the cylinder block 2a, can be acquired through integrated engine operating models

in the control computer.

  The computer 30 also receives information

  provided by the heating control system 32

  the passenger compartment, in particular the level of heating and / or different

  annuities functions like for example the demisting of the windows, requested by the users, as well as by the temperature

  external detected by a probe 33.

  Depending on these different parameters, the

  computer determines the position of valve 10.

  When starting the internal combustion engine 2 when the temperature of the coolant of this

  motor is greater than or equal to 20 C and in the absence of-

  cockpit heating or demisting

  very motor vehicle, the valve 10 is brought into its position in which the first valve 21a is applied against the seat of the valve l1a so that the track

  inlet 11 is closed (Fig. 2A).

  Thus, there is no circulation of water in the circuit.

  The heating of the motor 2 is therefore not hampered.

  vé and heat losses are reduced which decreases the

  fuel consumption and pollutant emissions.

  Still in the start-up phase or in operation-

  ment at low speed of engine 2 to meet a demand for heating of the passenger compartment, the linear actuator 20 of valve 10 is moved so as to bring the second valve 21b

  against the valve seat 13a in order to allow circulation

  tion of the coolant only in the aero-

  therm 8, as shown in fig. 2B.

  This opening is also a function of the

  external temperature and engine temperature 2.

  Indeed, the lower the external temperature, the less the engine 2 requires cooling, it is therefore possible to give priority to heating the passenger compartment by opening the circuit 7 of the heater 8 more widely.

  until the circulation of the coolant is prohibited

  spreading in circuit 1 of radiator 4 and in circuit

cooked 5 of the exchanger 6.

  When the temperature of engine 2 reaches a sufficient temperature, for example, around 60 C and the engine starts to operate normally, oil heating takes priority if there is a heating request

of the low or medium cabin.

  In this case, the linear actuator 20 of the valve 10 is moved so that the third valve 22 is applied to the seat of the valve 14a and prohibits the circulation of the coolant in the circuit 1 of the radiator 4, (Fig . 2C), but leaves the heat exchanger circuit 6 in addition to circuit 7 of the air heater 8.

  When the engine reaches its overheating threshold

  normal, the linear actuator 20 of the valve 10 is put in the intermediate position (Fig.l) in which the coolant circulates in all the circuits including the circuit 1 of the radiator 4 so as to evacuate the calories

additional.

  The temperature regulation of the motor 2 is ensured by the variation of the passage section towards the

radiator 4.

  The management system has been described with reference

  an internal combustion engine with positive ignition.

  This management system can also be used.

run with a diesel engine.

  In this case, it suffices to modify

quence, the management of the valve 10.

  For example, the oil temperature rises

faster in this type of engine.

  It is therefore interesting to start in the po-

  sition of the valve 10 authorizing the circulation of the

  cooling in the exchanger 6 in order to bring heat

  additional lines in the motor circuit 2.

  The heat exchange management system according to the invention makes it possible to ensure a rapid rise in temperature of the engine, which reduces fuel consumption and the emission of pollutants, while ensuring that the passenger compartment is heated as quickly as possible. of the motor vehicle. 5

Claims (8)

  1. A system for managing heat exchange in a motor vehicle, of the type comprising: - a closed loop circuit (1) for circulating a cooling fluid of an internal combustion engine (2) and comprising in series a pump (3) driving the cooling fluid and a heat exchange radiator (4),   - in parallel with said radiator (4), a pre-   mier branch circuit (5) fitted with an exchanger (6) -   coolant-oil, connected to the lubrication circuit   fication of said engine (2) and a second branch circuit (7) provided with an air heater (8) with a heating system for the passenger compartment of the vehicle, - and means (10) for orienting the coolant in said circuits, characterized in that the means for orienting the cooling fluid are formed by a valve (10) comprising in particular a position for closing the circulation of the   coolant in the internal combustion engine   dull (2) for a determined time to ensure a rise   rapid temperature of said motor (2).   2. System according to claim 1, characterized in that the valve (10) also comprises a position for closing the circulation of the cooling fluid in the radiator (4) and the exchanger (6) and for opening the circulation of the fluid in the engine (2) and the air heater (8), a position for closing the circulation of the fluid in the radiator (4) and for opening the circulation of this fluid in the engine (2), the exchanger (6) and the air heater (8) and intermediate positions for circulation of this fluid in the circuits (1, 5, 7)   3. System according to claim 1 or 2, charac-   terized in that the valve (10) is a valve with linear actuator (20) and comprising an inlet channel (11) of the coolant coming from the engine (2) and three ways of   outlet (12, 13, 14) of said respective coolant   tively towards the radiator (4), the exchanger (6) and the air therm (8).   4. System according to any one of the claims.   1 to 3, characterized in that the valve (10) is controlled by a computer (30) according to the operating parameters.   engine (2) and the heating control system cabin fage.   5. A system for managing heat exchanges in a motor vehicle, of the type comprising: - a closed loop circuit (1) for circulating a cooling fluid of an internal combustion engine (2) and comprising in series a pump (3) driving the cooling fluid and a heat exchange radiator (4),   - in parallel with said radiator (4), a pre-   mier branch circuit (5) fitted with an exchanger (6) -   coolant-oil, connected to the lubrication circuit   fication of said engine (2) and a second branch circuit (7) provided with an air heater (8) with a heating system for the passenger compartment of the vehicle, - and means (10) for orienting the coolant in circuits, characterized in that the means for orienting the cooling fluid are formed by a valve (10) controlled by   a computer (30) as a function of the function parameters-   engine (2) and heating control system of the passenger compartment.   6. System according to claim 5, characterized in that the valve (10) comprises in particular a closed position of the circulation of the cooling fluid   in the internal combustion engine (2) for a time   completed to ensure a rapid rise in temperature of said motor (2).   7. System according to claim 5 or 6, charac-   terized in that the valve (10) also has a posi-   closing the circulation of the coolant   in the radiator (4) and the exchanger (6) and open   fluid circulation in the engine (2) and the air   rotherm (8), a closed position for circulation of the   fluid in the radiator (4) and opening of the circulation   tion of this fluid in the engine (2), the exchanger (6) and the air heater (8) and intermediate positions of circulation   tion of this fluid in the circuits (1, 5, 7).   8. System according to any one of the claims.   tions 5 to 7, characterized in that the valve (10) is a valve with linear actuator (20) and comprising a channel   inlet (11) of the cooling fluid coming from the   tor (2) and three outlet channels (12, 13, 14) of said cooling fluid respectively to the radiator (4),   the exchanger (6) and the air heater (8).