CN1139722C - Cooling device of I.C. engine - Google Patents
Cooling device of I.C. engine Download PDFInfo
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- CN1139722C CN1139722C CNB011326565A CN01132656A CN1139722C CN 1139722 C CN1139722 C CN 1139722C CN B011326565 A CNB011326565 A CN B011326565A CN 01132656 A CN01132656 A CN 01132656A CN 1139722 C CN1139722 C CN 1139722C
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Abstract
To provide a cooling device for an internal combustion engine capable of controlling switch to supply of cooling water to a cylinder and a cylinder head based on a throttle opening and thereby reduce knocking and improve fuel consumption. The characteristic is in that it is provided with an engine rotational frequency sensor 32 for detecting an engine rotational frequency of the internal combustion engine, a throttle sensor 33 for detecting an opening of a throttle valve, a switch valve 20 for optionally switching to supply the cooling water to the cylinder or the cylinder head of the internal combustion engine, a driving means 31 for driving the switch valve 20, and a control means 30 for controlling the driving means 31 based on the throttle opening theta Th detected by the throttle sensor 33 and the engine rotational frequency Ne detected by the engine rotational frequency sensor 32. The control means 30 drives the driving means 31 to supply the cooling water to the cylinder head when it is determined that the throttle opening the engine rotating speed is large compared to the throttle opening.
Description
Technical field
The present invention relates to the cooling unit in the water-cooled engine.
Background technique
Usually, in the water-cooled engine, the water jacket of cylinder block side and the water jacket of cylinder head side are being communicated with, and the cooling water from water pump is discharged flows to cylinder head from cylinder, make engine cooling after the circulation in radiator.
Therefore, can not with engine speed and corresponding water yield supply cylinder of operating load and cylinder head.
Like this, the cooling of cylinder head is slow, causes engine knock easily, and perhaps because internal-combustion engine is cooled from cylinder, the thermal efficiency reduces, and causes that fuel availability reduces.
In addition, in TOHKEMY 2000-73770 communique, disclosed cylinder and cylinder head difference pipe arrangement, the example of control cooling independently of each other.In this example, during engine low load, make without the cooling liquid of radiator and only circulate, to scheme to suppress the temperature reduction of residual gas in the firing chamber in cylinder head.But do not consider to produce the cylinder head cooling in engine knock zone, so can not get reducing the effect of engine knock.
Summary of the invention
The present invention makes in view of this point, and its purpose is to provide a kind of cooling unit of internal-combustion engine, and this cooling unit is supplied with to the switching of the cooling water of cylinder and cylinder head according to controls such as throttle openings, can reduce engine knock and improve fuel availability.
To achieve these goals, the internal-combustion engine cooling unit of the present invention's first technological scheme circulates cooling water by the driving of water pump between internal-combustion engine and radiator, it is characterized in that, has:
Detect the engine rotation speed sensor of the engine speed of internal-combustion engine;
Detect the Air door sensor of air door valve opening;
Optionally switch the switching valve of supplying with cooling water to the cylinder or the cylinder head of internal-combustion engine;
Drive the driving mechanism of above-mentioned switching valve;
According to detected throttle opening of above-mentioned Air door sensor and the detected engine speed of above-mentioned engine rotation speed sensor, control the control gear of above-mentioned driving mechanism;
Above-mentioned control gear is judged as, and compares with engine speed, when throttle opening is big, drives above-mentioned driving mechanism, switches above-mentioned switching valve, supplies with cooling water to cylinder head.
Compare with engine speed, when throttle opening was big, prediction was risen because of the temperature of quickening to produce, the zone that is easy to generate engine knock when entering transition operation, so, preferentially the cooling water supply cylinder is covered, with the firing chamber cooling, can reduce engine knock effectively.
In addition, at this moment cooling water is not the supply cylinder side, not from the cylinder side cooling, so, can avoid the thermal efficiency to reduce, improve fuel availability.
The cooling unit of the internal-combustion engine of the present invention's second technological scheme, be in the cooling unit of the internal-combustion engine of above-mentioned first technological scheme, it is characterized in that, above-mentioned control gear, detect throttle opening when above when being judged as with respect to the big predetermined value of normal throttle opening of engine speed, drive above-mentioned driving mechanism, switch above-mentioned switching valve, to supply with cooling water to cylinder head.
When being judged as with engine speed that relatively throttle opening is big, judge and whether detect throttle opening than more than the big predetermined value of normal throttle opening with respect to engine speed, if big, then, reduce engine knock preferentially with cooling water supply cylinder lid, improve fuel availability.
The cooling unit of the internal-combustion engine of the present invention's the 3rd technological scheme, be in the cooling unit of the internal-combustion engine of above-mentioned first technological scheme, it is characterized in that, above-mentioned control gear has chart, this chart is the chart that has preestablished switch line on the coordinate as two coordinate axis with throttle opening and engine speed, above-mentioned switch line is relatively to be judged as the big threshold line of throttle opening with engine speed, be used to indicate the switching of above-mentioned switching valve, detected throttle opening and engine speed and the contrast of above-mentioned chart, according to judging, control above-mentioned switching valve with the relation of above-mentioned switch line.
With throttle opening and engine speed and chart contrast, when surpassing switch line, relatively being judged as throttle opening when big, preferentially supply with cooling water to cylinder head with engine speed, reduce engine knock and improve fuel availability.
The cooling unit of the internal-combustion engine of the present invention's the 4th technological scheme, be in the cooling unit of internal-combustion engine of the arbitrary technological scheme in above-mentioned first～the 3rd technological scheme, it is characterized in that, in the above-mentioned internal-combustion engine, cylinder and cylinder head are communicated with cooling water path, the cooling water inlet is arranged respectively on cylinder and cylinder head, coolant outlet is arranged on cylinder head.
When cruising, by the circulation from cylinder to cylinder lid, whole internal-combustion engine is cooled, with engine speed comparison throttle opening big give it the gun the time, can preferentially only supply with cooling water to cylinder head, can reduce engine knock, improve fuel availability.
The cooling unit of the internal-combustion engine of the present invention's the 5th technological scheme, be in the cooling unit of the internal-combustion engine of above-mentioned the 4th technological scheme, it is characterized in that above-mentioned switching valve, optionally switch the following supply mode of cooling water:, supply with above-mentioned cylinder the cooling water of discharging from water pump; The cooling water supply cylinder lid of discharging from water pump; The cooling water of discharging from water pump is not refluxed motor circularly.
With the switching of a switching valve, when cruising,, make the whole cooling of motor with the cooling water supply cylinder.When giving it the gun, with cooling water supply cylinder lid preferentially, reduce engine knock, improve fuel availability.When cold starting, make cooling water not be recycled to motor ground and also flow, can realize early stage warming-up.
Reduce component number, can make the miniaturization of switching valve body.
Description of drawings
Fig. 1 be the expression internal-combustion engine cooling construction in cold starting the time state sectional view.
Fig. 2 is the sectional view of water pump.
Fig. 3 is the schematic representation of cooling-water flow in the above-mentioned cooling construction of expression.
Fig. 4 be the expression internal-combustion engine cooling construction in cruising the time state sectional view.
Fig. 5 is the schematic representation of cooling-water flow in the above-mentioned cooling construction of expression.
Fig. 6 be the expression internal-combustion engine cooling construction in give it the gun the time state sectional view.
Fig. 7 is the schematic representation of cooling-water flow in the above-mentioned cooling construction of expression.
Fig. 8 is the schematic block diagram of cooling control system.
Fig. 9 is the coordinate with respect to the throttle opening variation of engine speed.
Figure 10 is the chart according to the switching of engine speed and throttle opening judgement switching valve.
Figure 11 is the sectional view of expression state when adopting cold starting in the internal-combustion engine cooling construction of other switching valve.
Figure 12 is the switching valve sectional view along the XII-XII line of Figure 11.
Figure 13 be the expression this switching valve cruising the time state sectional view.
The sectional view of state when Figure 14 is giving it the gun of this switching valve of expression.
Figure 15 be the expression another sliding type switching valve cold starting the time state sectional view.
Figure 16 be the expression this switching valve cruising the time state sectional view.
The sectional view of state when Figure 17 is giving it the gun of this switching valve of expression.
Figure 18 is the sectional view of the switching valve of another employing solenoid valve of expression.
Figure 19 is the schematic representation of cooling-water flow during cruising in another embodiment's cooling construction of expression.
Figure 20 is the schematic representation of expression cooling-water flow when giving it the gun in this cooling construction.
Figure 21 is the schematic representation of cooling-water flow during cruising in another embodiment's cooling construction of expression.
Figure 22 is the schematic representation of expression cooling-water flow when giving it the gun in this cooling construction.
Figure 23 is the schematic representation of cooling-water flow during another cruising in this cooling construction of expression.
Embodiment
Below, referring to figs. 1 through Fig. 9, one embodiment of the invention is described.
State when Fig. 1 to Fig. 3 represents cold starting in the cooling construction of present embodiment internal-combustion engine 1, the state when Fig. 4 and Fig. 5 represent cruising, the state when Fig. 6 and Fig. 7 represent to give it the gun.
See figures.1.and.2, cooling construction is described.
The cylinder block 2 of internal-combustion engine 1 is expressed as in the drawings with cylinder head 3 separates, but in fact is integrated by seal washer.Water jacket 2a around the cylinder chamber of cylinder block 2 is communicated with the firing chamber water jacket on every side of cylinder head 3 by the seal washer hole.
As shown in Figure 2, on cylinder head 3, be provided with water pump 4, cover on the pump cap assembly 5 of water pump 4, form suction port 5a that is communicated with Pump Suction Nozzle 4a and the exhaust port 5b that is communicated with pump discharge 4b.
The one end interlocking of pipe 12 is on side's connecting tube 6a, and the other end is rabbeted on the coolant outlet 10b of radiator 10, and like this, pipe 12 couples together radiator 10 and water pump 4.The cooling water inlet 10a of radiator 10 is connected with the coolant outlet 3b of cylinder head 3 by pipe 11.
The switching valve 20 that adopts in the present embodiment is rotary type four-way diverter valves, chimeric rotating internal rotor 22 in external stator 21,4 connecting tubes that are outstanding radially formation and internal communication on the external stator 21, rotating internal rotor 22 constitutes valve bodies in inside.
4 connecting tubes are made of the outflow connecting tube Eh in the inflow connecting tube I in big footpath, big footpath, the outflow connecting tube Ec of path and the outflow connecting tube Ep in big footpath.The inflow connecting tube I in big footpath is connected with the exhaust port 5b of water pump 4 by the pipe 25 in big footpath.The outflow connecting tube Eh in big footpath is connected with the cooling water inlet 3a of cylinder head 3 by the pipe 26 in big footpath.The outflow connecting tube Ec of path is connected with the cooling water inlet 2b of cylinder block 2 by the pipe 27 of path.The outflow connecting tube Ep in big footpath is connected with the suction port 5a of water pump 4 by the pipe 28 in big footpath.
Outflow connecting tube Eh is positioned at and the slightly relative position of inflow connecting tube I.Flow out connecting tube Ec and flow out connecting tube E perpendicular to flowing into connecting tube I and toward each other.
As the internal rotor 22 of valve body, rotate by servomotor 31 (or stepper motor), open and close inner space from internal rotor 22 to 3 paths that flow out connecting tube Eh, Ec, Ep with predetermined rotation angle.
In addition, the predetermined rotational angular of internal rotor 22, always opening to the path of the inner space of internal rotor 22 from inflow connecting tube I.
State when Fig. 1 represents cold starting leads to the path that flows out connecting tube Eh, Ec and is closed, and has only the path that leads to outflow connecting tube Ep to be opened.
Therefore, the cooling water of discharging from exhaust port 5b by the driving of water pump 4, by manage 25 flow into the inner space of internal rotor 22 from the inflow connecting tube I of switching valve 20 after, change squarely and flow to, by unique outflow connecting tube Ep that is opening, by managing the 28 suction port 5a that are back to water pump 4, constitute the circulation road.
That is, Fig. 3 is the schematic representation of expression flow of cooling water, and as shown in Figure 3, cooling water is not recycled to cylinder block 2, cylinder head 3 and radiator 10, and the cooling water of discharging from water pump 4 refluxes through switching valve 20 backs.
Like this, because the cooling water that comes out from water pump 4 is not recycled to motor, so, when cold starting, can carry out rapid warming-up, the initial stage stabilization that can improve exhaust emission characteristics and realize dallying.
During this cold starting, be cooling water not to be recycled to radiator 10 in the present embodiment, but, also the outflow connecting tube Ep of switching valve 20 can be connected on the cooling water inlet 10a of radiator 10, make cooling water be recycled to radiator 10, when cold starting, cooling water is recycled to radiator 10, can make the water temperature of cooling water not different because of the place.
When the temperature of cooling water rises to a certain degree, detected temperatures according to cooling-water temperature sensor 34 grades, switching valve 20 action (see figure 8)s, internal rotor 22 turns to predetermined angular position, as shown in Figure 4, to will open towards the path that flows out connecting tube Eh, Ec towards the path blockade that flows out connecting tube Ep.
Therefore, the cooling water of discharging from water pump 4 splits into two streams after flowing into the inner space of internal rotor 22 of switching valve 20, and one is to flow to cylinder head 3 from flowing out connecting tube Eh slightly as the crow flies, another is to change the flow direction squarely, flows to cylinder block 2 from flowing out connecting tube Ec.State when being cruising.
Be diverted to a side and flow out the cooling water of connecting tube Eh, slightly flow as the crow flies from flowing out connecting tube I, and, are large-diameter pipes owing to connect the pipe 26 that flows out connecting tube Eh and cylinder head 3, so resistance is little, can successfully flow.
Be diverted to the opposing party and flow out the cooling water of connecting tube Ec, change the flow direction squarely from flowing into connecting tube I, and, are small diameter tubes owing to connect the pipe 27 that flows out connecting tube Ec and cylinder block 2, so, resistance is arranged, flowing is suppressed.
Therefore, to cylinder head 3, more a spot of cooling water flow is to cylinder block 2 than relatively large cooling water flow, and like this, the cooling of motor is inexcessive, can prevent that the thermal efficiency from reducing, and prevents that fuel availability from reducing, and can cool off whole motor.
In addition, the cooling water that flows to cylinder block 2 moves on to cylinder head 3 by water jacket 2a, with the cooling water that flows directly into cylinder head 3, flows to radiator 10 from coolant outlet 3b by managing 11.
Seized hot cooling water by managing the 12 suction port 5a that are back to water pump 4 at radiator 10.
Cooling-water flow when Fig. 5 schematically represents cruising.
Constitute the circulation road of water pump 4 → switching valve, 20 → cylinder head 3 and cylinder block 2 → radiator 10 → water pump 4, can be effectively with entire internal combustion engine 1 cooling.
Usually, under this cooling construction, internal-combustion engine is turned round, and comprises slow acceleration and deceleration ground and carries out cruising.
In this cruising, when gas pedal by rapidly and the earth when depressing, air door is anxious to be opened, the air-fuel mixture amount of sending into increases the firing chamber in, the engine speed raising becomes higher load condition, becomes the operation range that is easy to generate engine knock.
When this gives it the gun, switching valve 20 actions, internal rotor 22 turns to predetermined angular position, as shown in Figure 6, will lead to the path that flows out connecting tube Ep and keep closing towards the path blockade that flows out connecting tube Ec, only will flow out connecting tube Eh and open.
Therefore, the cooling water of discharging from water pump 4 flows to cylinder head 3 from flowing out connecting tube Eh after flowing into the inner space of internal rotor 22 of switching valve 20 slightly as the crow flies.
Cooling water flows out from the coolant outlet 3b of cylinder head 3, flows to radiator 10 by managing 11, has been seized hot cooling water by managing the 12 suction port 5a that are back to water pump 4 at radiator 10.
Cooling-water flow when Fig. 7 represents schematically that this gives it the gun.
Constitute the circulation road of water pump 4 → switching valve 20 → cylinder head 3 → radiator 10 → water pump 4, whole cooling water flows arrives cylinder head 3, so, with a large amount of cooling waters the firing chamber of cylinder head 3 is cooled off rapidly.
When opening because of the urgency of air door valve, predict that engine speed postpones to rise in the back and will become high load the time, because the firing chamber of cylinder head 3 is earlier by a large amount of water quench, so, can prevent to produce engine knock.
When carrying out above-mentioned cold starting, during cruising with a switching valve 20, the switching controls of 3 states in when giving it the gun, the servomotor 31 that drives this switching valve 20 is by electronic control unit ECU30 control, the schematic block diagram of this control system as shown in Figure 8.
The testing signal that detects the engine rotation sensor 32 of the engine revolution of internal-combustion engine 1, the Air door sensor 33 of detection throttle opening, the cooling-water temperature sensor 34 of detection cooling water temperature etc. is input to ECU30, through after the signal processing, drive signal is exported to the servomotor 31 that drives switching valve 20.
As mentioned above, transfer from cold state to the cruising state, be that predetermined drive signal is output to servomotor 31 when the detection water temperature value of cooling-water temperature sensor 34 surpasses predetermined water temperature, the internal rotor 22 of switching valve 20 turns to pivotal position shown in Figure 4.
Cruising state and the transfer between state of giving it the gun are to finish judgement according to engine revolution and throttle opening, and control switching valve 20 carries out.
Among Fig. 9, the relation table of engine revolution Ne and throttle opening θ Th is shown on the XY rectangular coordinates.X-axis is represented engine revolution Ne, and Y-axis is represented throttle opening θ Th.
Normal throttle opening with respect to engine revolution Ne changes, and is expressed as normal throttle opening change curve C shown in the dotted line, that have certain slope
0
But when throttle opening θ Th was sharply opened, to compare throttle opening big with engine revolution, is partial to normal throttle opening change curve C
0Top (Y-axis postive direction), be expressed as the accelerator aperture change curve C shown in the solid line.
ECU30 is normal throttle opening change curve C
0Be stored in the storage with the XY rectangular coordinates, calculate the poor Δ θ of the normal throttle opening among throttle opening sensor 33 detected throttle opening θ Th and the detected engine revolution Ne of while.
When this Δ θ than predefined preset value delta θ
1When big, the prediction high load is exported predetermined drive signal from ECU30 to servomotor 31, the internal rotor 22 of switching valve 20 turns to pivotal position shown in Figure 6, prior to higher load condition, cooling water flow is arrived cylinder head 3, with the firing chamber quick cooling, can prevent engine knock.
Then, engine revolution rises, as the approaching normal throttle opening change curve C of detected throttle opening θ Th
0, Δ θ is than predefined preset value delta θ
2Hour, the internal rotor 22 of switching valve 20 returns pivotal position shown in Figure 4, becomes the cruising state.
Preset value delta θ
1, when being worth greater than this, be set at, throttle opening is big and enter the value of engine knock generation area with the engine revolution comparison with the difference of normal throttle opening.
Preset value delta θ
2Similarly, when the difference with normal throttle opening is worth less than this, be set at the value that breaks away from the engine knock generation area.
Like this, when detecting throttle opening than the big preset value delta θ of normal throttle opening with respect to engine revolution Ne
1When above, preferentially, can reduce engine knock with cooling water supply cylinder lid 3.
In addition, because cooling water does not supply to cylinder block 2, so, can prevent that the thermal efficiency from reducing, and improves fuel availability.
As mentioned above, for switching controls switching valve 20, except setting normal throttle opening change curve C
0Method outside, also can prepare chart in advance about engine revolution and throttle opening, detected engine revolution Ne and throttle opening θ Th and chart contrast, carry out switching judging.
Figure 10 is the example of this chart of expression.The relation table of engine revolution Ne and throttle opening θ Th is shown on the XY rectangular coordinates.X-axis is represented engine revolution Ne, and Y-axis is represented throttle opening θ Th.
The switch line Lh to each cylinder head shown in this chart is to compare with engine revolution, and throttle opening is big, is envisioned for the line that is predetermined that enters the engine knock generation area.
Comparing with engine revolution, the zone in this line Lh left side that throttle opening is big is the engine knock generation area.When the engine revolution Ne that detects and the point on the chart shown in the throttle opening θ Th enter this zone, from ECU30 predetermined drive signal is exported to servomotor 31, the internal rotor 22 of switching valve 20 turns to pivotal position shown in Figure 6, prior to higher load condition, preferentially cooling water is flowed into cylinder head 3, with the firing chamber quick cooling, can prevent that engine knock from taking place.
In addition, the line Lc that past cylinder shown in this chart switches, be that imagination breaks away from engine knock line generation area, that be predetermined, when the point on the chart shown in engine revolution Ne that detects and the throttle opening θ Th enters this line Lc right side regional, the internal rotor 22 of switching valve 20 returns pivotal position shown in Figure 4, becomes the cruising state.
As mentioned above,, when cruising, cooling water is supplied to cylinder block 2, make whole engine cooling with the switching of a revolving switch valve 20.When giving it the gun, preferentially cooling water is supplied to cylinder head 3, can reduce engine knock and improve fuel availability.When cold starting, cooling water is not recycled to motor ground and also flows, and can realize early stage warming-up.
Except switching valve 20, thermostat or other valve needn't be set in addition, can reduce component number, adopt revolving switching valve can make the switching valve miniaturization.
Below, with reference to Figure 11 to Figure 14, the modified example of this switching valve is described.
Among Figure 11, internal-combustion engine and cooling construction beyond this switching valve 50, same as the previously described embodiments, adopt same tag.
This switching valve 50, identical with above-mentioned switching valve 20, be rotary 4 logical diverter valves.Chimeric rotating internal rotor 52 in external stator 51.But,, on external stator 51, form 3 connecting tubes with internal communication, the remaining outstanding formation of the running shaft direction towards internal rotor 52 highlightedly towards the rotation of internal rotor 52 radiation direction as Figure 11 and shown in Figure 12.
Towards outstanding 3 connecting tubes that form of rotation radiation direction of internal rotor 52, be the inflow connecting tube I in big footpath, the outflow connecting tube Eh in big footpath and the outflow connecting tube Ec of path.The inflow connecting tube I in big footpath is connected with the exhaust port 5b of water pump 4 by large-diameter pipe 25.The outflow connecting tube Eh in big footpath is connected with the cooling water inlet 3a of cylinder head 3 by large-diameter pipe 26.The outflow connecting tube Ec of path is connected with the cooling water inlet 2b of cylinder block 2 by small diameter tube 27.The outstanding connecting tube that forms of running shaft direction towards internal rotor 52 is big outlet pipe Ep directly, and the outlet pipe Ep in this big footpath is connected with the suction port 5a of water pump 4 by large-diameter pipe 28.
Outflow connecting tube Eh is positioned at and the relative position of inflow connecting tube I.Flow out connecting tube Ec and flow out connecting tube Ep perpendicular to inflow connecting tube I, and also vertical mutually.
State when Figure 11 represents cold starting leads to the path that flows out connecting tube Eh, Ec and is closed, and only leads to the path that flows out connecting tube Ep and opens.Cooling water from water pump 4 is discharged by managing 25, flows into the inner space of internal rotor 52 from the inflow connecting tube I of switching valve 50, after changing the flow direction squarely, by the path of unique outflow connecting tube Ep that is opening,, constitute the circulation road by managing the 28 suction port 5a that are back to water pump 4.
Cooling water from water pump 4 comes out owing to be not recycled to motor, when cold starting, can carry out warming-up rapidly, the primary stability that can improve exhaust emission characteristics and realize dallying.
When cooling water temperature rises to a certain degree, switching valve 50 actions, internal rotor 52 turns to predetermined angular position, as shown in figure 13, will will open towards the path that flows out connecting tube Eh, Ec towards the path blockade that flows out connecting tube Ep.
Cooling water from water pump 4 discharges, behind the inner space of the internal rotor 52 of inflow switching valve 50, split into two streams, article one, be to flow to cylinder head 3 from flowing out connecting tube Eh slightly as the crow flies, another is to change the flow direction squarely, flow to cylinder block 2, the state when becoming cruising from flowing out connecting tube Ec.
Therefore, with the foregoing description similarly, to cylinder head 3, a spot of cooling water flow is to cylinder block 2 than relatively large cooling water flow, so cooled engine does not exceedingly prevent that the thermal efficiency from reducing, and prevents that fuel availability from reducing, and can make whole engine cooling.
When giving it the gun, the internal rotor 52 of switching valve 50 is further rotated predetermined angle, becomes the state of Figure 14, will lead to the path that flows out connecting tube Ep and keep closing towards the path blockade that flows out connecting tube Ec, only opens and flows out connecting tube Eh.
When the urgency because of air door is opened, engine speed postpones the back and rises when predicting high load, because the firing chamber of cylinder head 3 is earlier by a large amount of water quench, so, can prevent to produce engine knock.
Above-mentioned switching valve is rotary shunting switching valve, but also can adopt the diverter valve of sliding type, and Figure 15 to Figure 17 is the one example.
The switching valve 60 of this sliding type, chimeric the slide-valve 62 that can be free to slide in the inside of cylindrical case 60, slide-valve 62 is driven by stepper motor 65 by steel wire 66 and slides.
Slide-valve 62 is by pushings such as springs, and stepper motor 65 draws slide-valve 62 in the opposite direction by steel wire 66.
The both ends open portion of shell 61 is connected with the exhaust port of water pump, cooling water flows into from these two ends, outflow opening Eh, Ec, Ep are being offered in predetermined 3 positions at shell 61 perisporiums, the outflow opening Eh in big footpath is connected with cylinder head, the outflow opening Ec of path is connected with cylinder block, the outflow opening Ep in big footpath is connected with water pump, similarly constitutes cooling water circulation road with the foregoing description.
Ostium I connects the central shaft of slide-valve 62, forms annular slot 63,64 at predetermined 2 positions of slide-valve 62 outer circumferential faces, and intercommunicating pore 63a, 64a penetrate into annular slot 63,64 respectively from ostium 62a.
State when Figure 15 represents cold starting, slide-valve 62 cuts out outflow opening Eh, Ec, makes outflow opening Ep aim at annular slot 64 and opens.Flow into the cooling water from water pump 4 in the ostium 62a from two ends, by intercommunicating pore 64a, annular slot 64, Ep is back to water pump from outflow opening.
When cooling water temperature rises to a certain degree, switching valve 60 actions, slide-valve 62 slides into the precalculated position, and as shown in figure 16, Ep closes with outflow opening, and outflow opening Eh, Ec are opened.
Therefore, flow to cylinder head than relatively large cooling water from the outflow opening Eh in big footpath; More a spot of cooling water flows to cylinder block from the outflow opening Ec of path, the state when becoming cruising.
When giving it the gun, slide-valve 62 further slip intended distances as shown in figure 17, are closed outflow opening Ec, Ep, only open outflow opening Eh, and the firing chamber of cylinder head 3 can be prevented the generation of engine knock by a large amount of water quench.
Figure 18 represents another example of switching valve.
In this switching valve 70, branch out 3 outflow pathway Ep, Eh, Ec, on each outflow pathway Ep, Eh, Ec, disposing solenoid valve 71,72,73 respectively from the inflow path I of cooling water.
The outflow pathway Eh in big footpath is connected with cylinder head, and the outflow pathway Ec of path is connected with cylinder block, and outflow pathway Ep greatly directly is connected with water pump, with the foregoing description similarly, formation cooling water circulation road.
ECU controls each solenoid valve 71,72,73, when cold starting, only opens outflow pathway Ep, and cooling water is not recycled to motor, can realize early stage warming-up.When cruising, close outflow pathway Ep, open the outflow pathway Eh in big footpath and the outflow pathway Ec of path, mainly with the cylinder head cooling, prevent that the thermal efficiency from reducing, prevent that fuel availability from reducing, can be with whole engine cooling.When giving it the gun, only open the outflow pathway Eh in big footpath, with of the firing chamber cooling of a large amount of cooling waters, can prevent the generation of engine knock with cylinder head 3.
Switching valve is switched to the control of state when giving it the gun, judge back control according to engine revolution and the detected throttle opening of Air door sensor, but also can open for the urgency that detects air door, the variance ratio that calculates throttle opening is that rotational angular or its variance ratio of air door valve is angular acceleration, judges in view of the above.
Promptly, be predetermined the predetermined angle speed or the predetermined angle acceleration of the higher load condition of prediction air door valve, when the angular velocity that is judged as the air door valve that calculates according to the detected throttle opening of the Air door sensor of reality or angular acceleration have surpassed the angular velocity that is predetermined or angular acceleration, switching valve is switched to the state that gives it the gun.
Below, with reference to Figure 19 and Figure 20, the embodiment of another cooling construction is described.
In the above-mentioned cooling construction, switching valve 20 is positioned at the upstream side of cylinder block 2 and cylinder head 3, and the water jacket of cylinder block 2 and cylinder head 3 is communicated with.And in this cooling construction, switching valve 85 is positioned at the downstream side of cylinder block 81 and cylinder head 82, and the water jacket of cylinder block 81 and cylinder head 82 is not communicated with.
In the switching valve 85, flow into connecting tube Ic and be connected, flow into connecting tube Ih and be connected, flow out connecting tube Er and be connected with radiator 84 with the water jacket of cylinder head 82 with the water jacket of cylinder block 81, flow into connecting tube Ih and often be communicated with, with being communicated with of open and close valve control and inflow connecting tube Ic with outflow connecting tube Er.
That is, switching valve 85 is equivalent to collaborate valve.
The cooling water that water pump 83 sucks from radiator 84, access is branch on the way, but discharges cooling water supply cylinder body 81 and cylinder head 82.
State when Figure 19 represents cruising as shown in figure 19, is opened when flowing into connecting tube Ic, and the circuit cooling water side by side flows in cylinder block 81 and cylinder head 82 in radiator 84, can effectively entire internal combustion engine be cooled off.
In this cruising, depressed rapidly by the earth when gas pedal and become when giving it the gun, the inflow connecting tube Ic of switching valve 85 closes, as shown in figure 20, the cooling water that flows to cylinder block 81 is stopped, whole cooling water flows cools off the firing chamber of cylinder head 82 rapidly with a large amount of cooling waters to cylinder head 82, can prevent the generation of engine knock.
Below, with reference to Figure 21 and Figure 22, another embodiment is described.
In this cooling construction, the water jacket of cylinder block 91 and cylinder head 92 is communicated with, and switching valve 95 and switching valve 96 are configured in the upstream side and the downstream side of cylinder block 91 and cylinder head 92 respectively.
State when Figure 21 represents cruising, the cooling water that water pump 93 sucks from radiator 94 is discharged to switching valve 95, and switching valve 95 is with cooling water while supply cylinder body 91 and cylinder head 92, switching valve 96 flows into cooling water from the both sides of cylinder block 91 and cylinder head 92, is back to radiator 94.
Therefore, can effectively entire internal combustion engine be cooled off.
When giving it the gun, as shown in figure 22, switching valve 95 cuts out the outflow connecting tube Ec that leads to cylinder block 91, switching valve 96 cuts out the inflow connecting tube Ic from cylinder head 92, whole cooling water flows of discharging from water pump 93 are to cylinder head 92, with a large amount of cooling waters the firing chamber of cylinder head 92 is cooled off rapidly, can prevent the generation of engine knock.
In addition, because the water jacket of cylinder block 91 and cylinder head 92 is communicated with, so as shown in figure 23, switching valve 95 cuts out outflow connecting tube Eh towards cylinder head 92, opens the outflow connecting tube Ec towards cylinder block 91; Switching valve 96 cuts out inflow connecting tube Ic from cylinder block 91, when opening the inflow connecting tube Ih from cylinder head 92, the state in the time of can constituting the cruising different with Figure 21.
That is, as shown in figure 23, the cooling water from water pump 93 is discharged flows to cylinder head 92 from cylinder block 91, is back to radiator 94 from cylinder head 92 through switching valve 96, entire internal combustion engine can be cooled off.
In addition, switching valve in the various embodiments of the present invention drives uses servomotor, be to adopt stepper motor, stage ground opens and closes each cooling water path of switching valve, not with the cooling water path full cut-off of Fig. 3, Fig. 7, Figure 20, each figure of Figure 23, make a spot of flow of cooling water, can prevent that the portion of silting up the temperature of each cooling water from rising.
Claims (5)
1. the cooling unit of internal-combustion engine by the driving of water pump, circulates cooling water between internal-combustion engine and radiator, it is characterized in that, has:
Detect the engine rotation speed sensor of the engine speed of internal-combustion engine;
Detect the Air door sensor of throttle opening;
Selectively switch the switching valve of supplying with cooling water to the cylinder or the cylinder head of internal-combustion engine;
Drive the driving mechanism of above-mentioned switching valve;
Control the control gear of above-mentioned driving mechanism according to the detected throttle opening of above-mentioned Air door sensor and the detected engine speed of above-mentioned engine rotation speed sensor;
Above-mentioned control gear is judged as, and compares with engine speed, when throttle opening is big, drives above-mentioned driving mechanism, switches above-mentioned switching valve, to supply with cooling water to cylinder head.
2. the cooling unit of internal-combustion engine as claimed in claim 1, it is characterized in that, detect throttle opening when above, drive above-mentioned driving mechanism with respect to the big predetermined value of normal throttle opening of engine speed when being judged as, switch above-mentioned switching valve, to supply with cooling water to cylinder head.
3. the cooling unit of internal-combustion engine as claimed in claim 1, it is characterized in that, above-mentioned control gear has chart, this chart is the chart that has preestablished switch line on the coordinate that is two coordinate axis with throttle opening and engine speed, above-mentioned switch line is relatively to be judged as the big threshold line of throttle opening with engine speed, be used to indicate the switching of above-mentioned switching valve, detected throttle opening and engine speed and the contrast of above-mentioned chart, according to judging, control above-mentioned switching valve with the relation of above-mentioned switch line.
4. as the cooling unit of each described internal-combustion engine in the claim 1 to 3, it is characterized in that in the above-mentioned internal-combustion engine, cylinder and cylinder head are communicated with cooling water path, and the cooling water inlet is arranged respectively, and coolant outlet is arranged on cylinder head on cylinder and cylinder head.
5. the cooling unit of internal-combustion engine as claimed in claim 4 is characterized in that, above-mentioned switching valve selectively switches the following supply mode of cooling water: the cooling water of discharging from water pump is supplied with above-mentioned cylinder; The cooling water supply cylinder lid of discharging from water pump; The cooling water of discharging from water pump is not recycled to motor ground to reflux.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP274039/2000 | 2000-09-08 | ||
| JP2000274039A JP2002089265A (en) | 2000-09-08 | 2000-09-08 | Cooling device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1343834A CN1343834A (en) | 2002-04-10 |
| CN1139722C true CN1139722C (en) | 2004-02-25 |
Family
ID=18759873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011326565A Expired - Fee Related CN1139722C (en) | 2000-09-08 | 2001-09-07 | Cooling device of I.C. engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2002089265A (en) |
| CN (1) | CN1139722C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2896272B1 (en) * | 2006-01-19 | 2012-08-17 | Renault Sas | METHOD AND DEVICE FOR CONTROLLING THE FIRST OPENING OF A THERMOSTAT REGULATING THE TEMPERATURE OF AN INTERNAL COMBUSTION ENGINE. |
| SE530034C2 (en) * | 2006-06-30 | 2008-02-12 | Scania Cv Abp | Cooling device for a motor vehicle |
| JP4591435B2 (en) * | 2006-10-24 | 2010-12-01 | トヨタ自動車株式会社 | Cooling control device for internal combustion engine |
| US9874134B2 (en) * | 2013-04-30 | 2018-01-23 | Toyota Jidosha Kabushiki Kaisha | Cooling water control apparatus |
| JP6123630B2 (en) * | 2013-10-21 | 2017-05-10 | トヨタ自動車株式会社 | Cooling device for internal combustion engine |
| JP6280776B2 (en) * | 2014-03-20 | 2018-02-14 | 日立オートモティブシステムズ株式会社 | Control device for internal combustion engine |
| JP6192594B2 (en) * | 2014-05-27 | 2017-09-06 | 愛三工業株式会社 | Grill shutter device |
| CN104791073A (en) * | 2015-04-28 | 2015-07-22 | 湖南南方安美消防设备有限公司 | Diesel engine cooling water pipeline system |
| JP6631264B2 (en) * | 2016-01-15 | 2020-01-15 | スズキ株式会社 | Cooling structure of internal combustion engine |
| JP6315001B2 (en) * | 2016-02-01 | 2018-04-25 | トヨタ自動車株式会社 | Engine cooling system |
| JP7035586B2 (en) * | 2018-02-08 | 2022-03-15 | 株式会社デンソー | Cooling water control valve device |
| CN114526148A (en) * | 2022-02-15 | 2022-05-24 | 中国重汽集团济南动力有限公司 | Engine heat management valve control system and method, engine and automobile |
-
2000
- 2000-09-08 JP JP2000274039A patent/JP2002089265A/en active Pending
-
2001
- 2001-09-07 CN CNB011326565A patent/CN1139722C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1343834A (en) | 2002-04-10 |
| JP2002089265A (en) | 2002-03-27 |
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