JP3843499B2 - Cooling water circuit for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a heat storage tank that stores heat of a water-cooled internal combustion engine (hereinafter referred to as an engine), and uses the heat stored in the heat storage tank to promote warm-up of the engine or instant heating. This relates to the cooling water circuit.
[0002]
[Prior art]
As described above, the cooling water circuit of the internal combustion engine uses the heat stored in the heat storage tank to promote engine warm-up or quick-acting heating. It is necessary to inject water.
In response to this need, Japanese Patent Application Laid-Open No. 7-257154 discloses that when a heat storage tank and an engine are connected and the cooling water temperature discharged from the engine exceeds a predetermined value, the cooling water from the engine stores heat. It is configured to be guided into the tank.
[0003]
[Problems to be solved by the invention]
By the way, in the thing of the said gazette, since cooling water is circulated with the water pump which obtains driving force from an engine and rotates, the amount of cooling water to circulate changes with engine rotation speeds. For this reason, even when the cooling water temperature rises to a predetermined value or higher, when the engine speed is low, a sufficient amount of cooling water cannot be poured into the heat storage tank.
[0004]
In view of the above points, an object of the present invention is to store high-temperature cooling water in a heat storage tank without being affected by the engine speed.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention uses the following technical means. Claim1In the invention described inWhen the cooling water temperature rises to the first predetermined temperature or higher, the cooling water control valve (26) is operated to the open state of the opening flow path (45) to store the cooling water discharged from the water-cooled internal combustion engine (1). Set the first heat storage mode to flow into the tank (4),
  When the cooling water temperature is higher than the first predetermined temperature and rises to a second predetermined temperature or higher corresponding to the cooling water temperature at which the temperature sensing valve (13) starts to open, the cooling water control valve (26 ) To the open state of the open channel (45),The cooling water discharged from the water-cooled internal combustion engine (1) is operated by operating the electric pump (15).By electric pump (15)Pump toward the heat storage tank (4)Set the second heat storage modeIt is characterized by that.
[0006]
Thus, when the temperature sensing valve (13) at which the cooling water temperature becomes the highest starts to open, the cooling water is pumped toward the heat storage tank (4) by the electric pump, so that the high-temperature cooling water is supplied to the water-cooled internal combustion engine ( It can be quickly stored in the heat storage tank (4) without being affected by the rotational speed of 1).
In the second aspect of the present invention, first, the amount of heat given to the temperature-sensing operation part (13a) is decreased in accordance with the decrease in the load of the water-cooled internal combustion engine (1), thereby the temperature-sensing operation valve ( 13) A load response control means (18, 23, 26) for increasing the cooling water temperature at which the opening of the cooling water starts is disposed in the temperature sensitive water channel (101). Second, when the temperature sensing valve (13) reaches a cooling water temperature at which the load of the water-cooled internal combustion engine (1) is less than a predetermined value, the electric pump (15) is operated to activate the water-cooled internal combustion engine. The cooling water discharged from the engine (1) is pumped toward the heat storage tank (4).
[0007]
First, the cooling water temperature is maintained at a high temperature by reducing the amount of heat given to the temperature sensitive operation part (13a) in accordance with a decrease in the load of the water-cooled internal combustion engine (1). Second, when the cooling water temperature is maintained at a high temperature, the cooling water is quickly stored in the heat storage tank (4) by the electric pump (15), so that the higher temperature cooling water is stored in the heat storage tank (4). Can be stored inside.
[0008]
In invention of Claim 3, when the amount of the cooling water pumped toward the heat storage tank (4) by the electric pump (15) exceeds the volume of the heat storage tank (4), the electric pump is stopped. And
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described.
(Embodiment)
FIG. 1 shows a cooling water circuit of a water-cooled internal combustion engine (hereinafter referred to as an engine) 1 for a vehicle, and a heating cooling water circuit of an air conditioner that heats the interior of a vehicle by using the cooling water of the engine 1 as a heat source. Yes. Reference numeral 2 denotes a radiator that cools cooling water flowing out from the engine 1, and reference numeral 3 denotes a water pump (mechanical pump) that obtains driving force from the engine 1 and sucks the cooling water flowing out from the engine 1 and pumps it to the engine 1. is there.
[0010]
4 is a heat storage tank which has a double tank structure and keeps the cooling water stored warm (detailed structure will be described later). Reference numeral 5 denotes a heater core that heats air by using cooling water as a heat source. The heater core 5 is disposed in an air conditioning casing 6 that forms a flow path of air that is blown into the passenger compartment. A blower 7 is disposed on the air upstream side of the air conditioning casing 6, and a known evaporator (evaporator) 8 serving as an air cooling means is disposed between the blower 7 and the heater core 5. Yes. In the present embodiment, a so-called reheat type air conditioner that adjusts the temperature of the air blown into the passenger compartment by the flow rate and the amount of air blown through the heater core 5 is employed.
[0011]
Reference numeral 9 denotes an intake heat exchanger that exchanges heat between air sucked into the engine 1 and cooling water. The intake heat exchanger 9 is disposed in a surge tank 10 that removes pulsation of intake air. Yes. 11 is an A / T heat exchanger that exchanges heat between the cooling water flowing out from the engine 1 and the transmission oil of the automatic transmission (automatic transmission), and 12 is the cooling water flowing out from the engine 1 and the engine oil. It is an E / O heat exchanger that exchanges heat with each other.
[0012]
Reference numeral 100 denotes a radiator water channel that returns the cooling water flowing out from the engine 1 to the engine 1 through the radiator 2, and 101 denotes a bypass water channel (temperature-sensitive water) that causes the cooling water flowing out from the engine 1 to bypass the radiator 2 and return to the engine 1. Road). The bypass water channel 101 joins the radiator water channel 100 on the cooling water outlet side of the radiator 2 in the radiator water channel 100, and a known thermostat that opens and closes a valve body in accordance with the cooling water temperature is provided at the joining part 100 a. A (temperature-sensitive operation valve) 13 is provided.
[0013]
In the bypass water channel 101, the cooling water that has flowed through the bypass water channel 101 in the joining portion 100a is guided to a temperature-sensitive operation part (wax box filled with a wax material) 13a (see FIG. 4) of the thermostat 13. Is connected to the confluence portion 100a. Since the thermostat 13 opens and closes the radiator water channel 100 by disposing the valve body portion of the thermostat 13 at a position closer to the radiator 2 than the merging site 100a, even if the thermostat 13 is closed, the bypass water channel 101 can communicate.
[0014]
In FIG. 1, reference numeral 104 denotes a heater water channel for returning the cooling water flowing out from the heat storage tank 4 to the engine 1 through the heater core 5, the intake heat exchanger 9, the A / T heat exchanger 11 and the E / O heat exchanger 12. 105 is a heater bypass water channel that guides the cooling water flowing out from the heat storage tank 4 to the inlet side of the A / T heat exchanger 11 by bypassing the heater core 5 and the intake heat exchanger 9.
[0015]
  Reference numeral 102 denotes a tank outflow water channel that guides the cooling water in the heat storage tank 4 to the engine 1, and 103 denotes a tank inflow water channel that branches from the radiator water channel 100 and guides the cooling water to the heat storage tank 4. The tank inflow water channel 103 is provided with a check valve 14 for preventing cooling water from flowing from the inflow side of the heat storage tank 4 to the branch part side of the radiator water channel 100 and the tank inflow water channel 103. The cooling water is guided to the heat storage tank 4 by bypassing the check valve 14.Cooling channel (no code)Is provided with an electric pump 15 that is driven by obtaining electric power from a battery (not shown).
[0016]
   Also,Heater channelA flow rate control valve 16 for controlling the amount of cooling water flowing through the heater core 5 is disposed at a branch portion between the heater 104 and the heater bypass water channel 105. The flow rate control valve 16 is driven by an actuator 17 such as a servo motor. ing.
  And the actuator 17, the electric pump 15, and the cooling water control valve mentioned later26 actuators 25Is controlled by a control device 18 as shown in FIG.It has become so.The control device 18 includes a water temperature sensor 19 for detecting the temperature of the cooling water returning to the engine 1, a water temperature sensor 20 for detecting the temperature of the cooling water flowing through the heater water channel 104, and the cooling water temperature immediately after the engine flows out (or the engine The water temperature sensor 21 for detecting the cooling water temperature in the engine 1), the air conditioner sensor 22 for detecting information necessary for controlling the air conditioner such as the outside temperature sensor and the inside temperature sensor, and the intake negative pressure of the engine 1 are electrically Signals from the pressure sensor 23 to be detected and the ignition switch 24 to detect the operating state of the engine 1 are input.
[0017]
The water temperature sensors 19, 20, and 21 are of thermistor type with excellent response (time constant is about 1 to 2 seconds).
Incidentally, 25 is an immediate effect heating switch that conducts heating by guiding the high-temperature cooling water in the heat storage tank 4 to the heater core 5 when the cooling water temperature is low immediately after the start of the engine 1 or the like and the heating operation cannot be performed. The immediate effect heating switch 25 is turned on by a passenger's manual operation.
[0018]
In FIG. 1, reference numeral 26 denotes a cooling water control valve that switches the cooling water channel according to the cooling water temperature and the operating state of the engine 1 and adjusts the amount of cooling water flowing through the bypass water channel 101. Are driven by an actuator 25 such as a servo motor.
FIG. 3 is a sectional view showing a state in which the cooling water control valve 26 is assembled to the heat storage tank 4. The heat storage tank 4 includes an inner tank 41 and an outer tank 42 made of a material having excellent corrosion resistance such as stainless steel, and a substantially vacuum heat insulating layer is provided between the tanks 42 and 42 in order to improve heat insulating properties. 43 is formed. In FIG. 3, since the inner tank 41 and the outer tank 42 are thin, hatching indicating a cross section is omitted.
[0019]
  Further, a tubular projecting portion 44 projecting downward in the gravitational direction is formed below the heat storage tank 4 in the gravitational direction, and an opening flow path through which cooling water flows in and out at the tip portion of the tubular projecting portion 44. 45 is formed.
  And in the opening flow path 45, the water intake (not shown) opened in the site | part of the gravity direction upper side among the thermal storage tanks 4TheA water intake pipe 46 that guides the cooling water in the heat storage tank 4 to the outside of the heat storage tank 4 is disposed concentrically with the opening flow path 45, and a space between the water intake pipe 46 and the opening flow path 45. However, an inflow path 47 that guides the cooling water discharged from the engine 1 into the heat storage tank 4 is formed.
[0020]
Reference numeral 261 denotes a housing of the cooling water control valve 26, and the housing 261 is formed of a resin having excellent moldability and heat insulation properties such as nylon 66. The housing 261 covers the entire tubular protrusion 44 of the heat storage tank 4 from the outside to prevent heat radiation from the tubular protrusion 44.
262 is a rotary control valve of the cooling water control valve 26 that is located in the vicinity of the opening flow channel 45 and performs switching opening and closing of the opening flow channel 45 and each of the cooling water channels 101, 102, 103 and adjusting the flow rate of the bypass water channel 101. The control valve body 262 is formed in a substantially cylindrical shape, and is disposed so as to be rotatable with its cylinder axis aligned with the center of the opening channel 45 as shown in FIG. As shown in FIG. 4, the control valve body 262 is rotationally driven from the actuator 25 through a speed reduction mechanism including a worm 251, a worm wheel 252, a spur gear 253, and a fan-shaped gear 254.
[0021]
Incidentally, 263 is a fluororesin sealing member that seals the gap between the control valve body 262 and the housing 261, and 264 is an O-ring made of nitrile rubber. Reference numeral 48 denotes a disc-shaped mixing prevention plate that suppresses mixing of the cooling water flowing into the heat storage tank 4 and the cooling water staying in the heat storage tank 4, and the mixing prevention plate 48 is supplied with cooling water. A large number of through holes 48a to be circulated are formed.
[0022]
Next, the operation of this embodiment will be described.
1. Cooling water insulation mode (when engine 1 is stopped)
When it is determined by the signal from the ignition switch 24 that the engine 1 has stopped, the opening flow path 45 is closed. Thereby, since the inside and outside of the heat storage tank 4 is shut off, the cooling water stored in the heat storage tank 4 is held in the heat storage tank 4 (see FIGS. 1 and 4).
[0023]
When the engine 1 is stopped regardless of whether the cooling water temperature or the immediate effect heating switch 23 is turned on, the control device 18 switches the cooling water control valve 26 to the cooling water heat retention mode.
2. Engine warm-up promotion mode
When the engine 1 is started, the opening flow path 45 is opened and the low-temperature cooling water flowing out from the engine 1 is caused to flow into the heat storage tank 4, and the high-temperature cooling water stored in the heat storage tank 4 is passed through the tank water channel 102. Guide to engine 1. Thereby, the high-temperature cooling water stored in the heat storage tank 4 circulates in the engine 1 to promote the warm-up operation of the engine 1 (see FIGS. 5 and 6).
[0024]
3. Instant heating mode
When the immediate heating switch 23 is turned on after the engine 1 is started, the control device 18 switches the coolant control valve 26 to the engine warm-up promotion mode. Thereby, the high-temperature cooling water stored in the heat storage tank 4 flows through the heater water channel 104 and flows to the heater core 5 to achieve immediate heating (see FIGS. 7 and 8).
[0025]
4). Cold water retention mode
The temperature T of the cooling water flowing out of the heat storage tank 4 in the engine warm-up promotion mode_{W 1}When (the detected value of the water temperature sensor 19) falls below the first predetermined temperature, the bypass water passage 101 and the opening passage 45 are closed, and the cooling water flowing out from the engine 1 is directly returned to the engine 1 by bypassing the heat storage tank 4 (See FIGS. 9 and 10).
[0026]
  The first predetermined temperature is appropriately determined based on the heat retention capacity of the heat storage tank 4, the minimum outside air temperature, and the like, and is about 30 ° C. in the present embodiment.
  5). Thermal storage mode A
  Temperature T of cooling water flowing out from the engine 1 in the cold water holding mode_w2(Water temperature sensor21When the detected value reaches the second predetermined temperature (about 80 ° C. in the present embodiment), it is considered that the warm-up operation has been completed, and the opening flow path 45 is opened.
  Furthermore, when the absolute value of the suction negative pressure Pin of the engine 1 exceeds 35 mmHg, the amount of cooling water flowing through the bypass water channel 101 (101a) is reduced (see FIGS. 11 and 12).
[0027]
Thereby, the cooling water flowing out from the engine 1 flows through the bypass water channel 101, the heater core 5, and the heat storage tank 4. Therefore, high-temperature cooling water is stored in the heat storage tank 4. On the other hand, since a small amount of cooling water flows through the bypass water channel 101, the temperature sensing operation of the temperature sensing operation part 13a of the thermostat 13 becomes dull and the cooling water temperature is maintained at about 100 ° C.
[0028]
6). Thermal storage mode B
Temperature T of cooling water flowing out from the engine 1 in the cold water holding mode_{W 2}When the temperature reaches the second predetermined temperature, it is considered that the warm-up operation has been completed, and the opening channel 45 is opened. Further, the negative suction pressure P of the engine 1_inWhen the absolute value of is 35 mmHg or less, the amount of cooling water flowing through the bypass water channel 101 (101a) is maximized (see FIGS. 13 and 14).
[0029]
Thereby, the cooling water flowing out from the engine 1 flows through the bypass water channel 101, the heater core 5, and the heat storage tank 4. Therefore, high-temperature cooling water is stored in the heat storage tank 4. On the other hand, since a large amount of cooling water flows through the bypass water channel 101, the temperature sensing operation of the temperature sensing operation unit 13a is quickly performed, and the cooling water temperature is maintained at about 80 ° C.
[0030]
As apparent from the description of the operation of the heat storage modes A and B described above, load response control means for controlling the cooling water temperature at which the thermostat 13 starts to open by the control device 18, the pressure sensor 23 and the cooling water control valve 26 is provided. It is composed.
In addition, 35 mmHg (suction negative pressure P) which is a threshold value for setting the heat storage mode A or the heat storage mode B_inAs is well known, it is an index indicating the magnitude of the engine load, and is not limited to 35 mmHg, but is appropriately determined according to the engine displacement, the output characteristics of the engine 1, and the like.
[0031]
  7). Thermal storage mode C
  The temperature T of the cooling water discharged from the engine 1 in the heat storage mode A_w3When the (detected value of the water temperature sensor 21) reaches the third predetermined temperature, it is considered that the thermostat 13 starts to open, and the cooling water control valve 26 is set to the engine warm-up promotion mode.StateAnd the electric pump 15 is operated.
  ThisThermal storage mode C is set,Since the cooling water is pumped into the heat storage tank 4 by the electric pump 15, the high-temperature cooling water discharged from the engine 1 is quickly stored in the heat storage tank 4.
[0032]
A predetermined time t after the electric pump 15 is activated.₁When the time has elapsed, the amount of cooling water pumped toward the heat storage tank 4 by the electric pump 15 is regarded as exceeding the capacity of the heat storage tank 4 (in this embodiment, about 3000 cc), and the cooling water control valve 26 is stored in heat. The mode is switched to mode A and the electric pump 15 is stopped. As a result, the cooling water discharged from the engine 1 can flow again to the radiator 2, so that the temperature of the engine 1 (cooling water) is excessively increased and the engine 1 is prevented from being seized.
[0033]
Since the third predetermined temperature corresponds to the cooling water temperature at which the thermostat 13 begins to open as described above, the response speed of the thermostat 13 and the location of the thermostat 13 and the arrangement of the water temperature sensor 21 are the same. It is determined as appropriate depending on the site or the like provided, and is about 105 ° C. in this embodiment.
In addition, the predetermined time t₁This is appropriately determined depending on the volume of the heat storage tank 4 and the capacity of the electric pump 15, and is about 30 seconds in this embodiment.
[0034]
Incidentally, the bypass water channel 101 is opened only in the heat storage modes A, B, and C, and the bypass water channel 101 is closed in the cooling water heat retention mode, the engine warm-up promotion mode (immediate heating mode), and the cold water retention mode. Yes.
FIGS. 15 and 16 are flowcharts showing the operation of the cooling water control valve 26 and the electric pump 15 corresponding to each mode, and the flowchart will be described below.
[0035]
  Ignition switch24It is determined whether or not the engine 1 is operating (step 100), and if it is determined that the engine 1 is operating, the water temperature sensor21The temperature T of the coolant immediately after the engine spill detected by_w0Is determined to be 80 ° C. or higher (step 105),In step 100, the engine 1When it is determined that the vehicle is stopped, the cooling water heat retention mode is set (step310).
[0036]
And the temperature T of the cooling water_{W 0}Is determined to be 80 ° C. or higher, the heat storage mode is set (step 200), and the cooling water temperature T_{W 0}Is determined to be less than 80 ° C., the engine warm-up promotion mode is set (step 110).
Next, it is determined whether or not the immediate heating switch 23 is turned on (step 120). When it is determined that the immediate heating switch 23 is turned on, the immediate heating mode is set (step 130). On the other hand, when it is determined that the immediate heating switch 23 is not turned on, the cooling water temperature T_{W 1}Is determined to be 30 ° C. or higher (step 140), and the cooling water temperature T_{W 1}Is determined to be less than 30 ° C., a cold water retention mode is set (step 150). Meanwhile, the temperature T of the cooling water_{W 1}Is determined to be 30 ° C. or higher, the cooling water temperature T_{W 1}The engine warm-up promotion mode is set until the temperature becomes less than 30 ° C. (steps 160 and 170).
[0037]
And the temperature T of the cooling water_{W 1}Is determined to be less than 30 ° C., the cooling water temperature T_{W 2}Until the temperature reaches 80 ° C. or higher (steps 180 and 190), and the cooling water temperature T_{W 2}When the engine temperature exceeds 80 ° C., the suction negative pressure P of the engine 1_inIt is determined whether the absolute value of is greater than 35 mmHg (step 200).
[0038]
Next, suction negative pressure P_inIs determined to be less than 35 mmHg, the heat storage mode B is set (step 210), and the suction negative pressure P_inIs determined to be greater than 35 mmHg, the heat storage mode A is set (step 220). And the temperature T of the cooling water_{W 3}Is determined to be equal to or higher than 105 ° C. (step 230), and the cooling water temperature T_{W 3}Is determined to be 105 ° C. or higher, the predetermined time t₁It is set as the heat storage mode C until it passes (steps 240-290).
[0039]
Next, the heat storage mode A, the heat storage mode B, or the heat storage mode C is maintained until the engine 1 stops (step 300), and the cooling water heat retention mode is set with the stop of the engine 1 (step 310).
Next, features of the present embodiment will be described.
According to the present embodiment, when the engine 1 is stopped, the opening passage 45 is closed and the inside and outside of the heat storage tank 4 are shut off, so that the cooling water stored in the heat storage tank 4 is held in the heat storage tank 4. The Thereby, it is possible to prevent convection between the cooling water of the portion other than the heat storage tank 4 (for example, piping connected to the heat storage tank 4) and the cooling water of the heat storage tank 4 while the engine 1 is stopped. Therefore, since mixing of the cooling water of parts other than the heat storage tank 4 and the cooling water of the heat storage tank 4 can be prevented, the heat retention capacity of the heat storage tank 4 can be improved.
[0040]
Further, since the control valve body 262 that closes the open flow path 45 is located in the vicinity of the open flow path 45 of the heat storage tank 4, mixing of the cooling water of the portion other than the heat storage tank 4 and the cooling water of the heat storage tank 4 Can be prevented more reliably. As a result, the heat retention capacity of the heat storage tank 4 can be further improved.
By the way, in the engine warm-up promotion mode, the low-temperature cooling water staying in the engine 1 flows into the heat storage tank 4 as the engine 1 is started, and the high-temperature cooling water stored in the heat storage tank 4 is replaced with the engine 1. Flow into. However, if all of the high-temperature cooling water stored in the heat storage tank 4 flows out, the low-temperature cooling water discharged from the engine 1 immediately after the engine starts returns to the engine 1, and cooling of the engine 1 is performed. On the other hand, water temperature falls and warm-up operation is delayed.
[0041]
On the other hand, in this embodiment, the temperature T of the cooling water flowing out of the heat storage tank 4_{W 1}When the temperature falls below the first predetermined temperature, the cooling water flowing out from the engine 1 bypasses the heat storage tank 4 and is directly returned to the engine 1, so that the low temperature cooling water discharged from the engine 1 immediately after the engine is started is stored in the heat storage tank. 4, it can be prevented from returning to the engine 1.
[0042]
Therefore, since the delay of the warm-up operation can be prevented, the amount of harmful substances (exhaust emissions) released into the atmosphere during the warm-up operation can be reduced, and the fuel consumption can be improved.
Further, since the bypass water channel 101 is closed in the engine warm-up promotion mode, it is possible to prevent the low-temperature cooling water discharged from the engine 1 immediately after starting the engine from returning to the engine 1. Therefore, the warm-up operation of the engine 1 can be sufficiently promoted by the high-temperature cooling water stored in the heat storage tank 4.
[0043]
In addition, the switching valve mechanism and the flow rate control valve mechanism are independent of each other because the switching flow opening and closing of the opening flow channel 45 and the cooling water channels 101, 102, and 103 and the flow rate adjustment of the bypass water channel 101 are performed by one control valve body 262. Compared with the valve means, the size can be reduced as the number of parts decreases, and the mounting of the cooling water circuit according to the present embodiment on the vehicle (installability) is improved. Can do.
[0044]
Further, by closing the bypass water channel 101 during the engine warm-up promotion mode, the immediate effect heating mode, and the cold water holding mode, the bypass water channel 101 is closed during the warm-up operation, so that the load on the engine 1 increases during the warm-up operation. (Suction negative pressure P_inUnlike the case where the amount of cooling water that mechanically circulates in the bypass water passage 101 is controlled by negative suction pressure, the low-temperature cooling water discharged from the engine 1 circulates in the bypass water passage 101 to produce a large amount of engine. 1 can be prevented from refluxing. Therefore, the warm-up operation of the engine 1 can be further promoted.
By the way, the cooling water temperature is highest when the thermostat 13 starts to open. And according to this embodiment, temperature T of the cooling water discharged from the engine 1_{W 3}When the temperature reaches 105 ° C., it is considered that the thermostat 13 has started to open, and the electric pump 15 is operated by switching the cooling water control valve 26 to the engine warm-up promotion mode, so that it is influenced by the rotational speed of the engine 1. Without this, high-temperature cooling water can be quickly stored in the heat storage tank 4. Accordingly, it is possible to effectively promote warm-up of the engine or immediate heating when the engine is started next time.
[0045]
By the way, in the present embodiment, as described above, when the load of the engine 1 is small (the intake negative pressure P of the engine 1)._inThe cooling water temperature is maintained at about 100 ° C. and the load on the engine 1 is large (the intake negative pressure P of the engine 1)._inThe cooling water temperature is maintained at about 80 ° C. (when the absolute value of is 35 mmHg or less). In the present embodiment, when the load on the engine 1 is small and the coolant temperature is high, the electric pump 15 is operated to actively store the coolant in the heat storage tank 4, so that the coolant with a higher temperature is stored. Can be stored in the heat storage tank 4.
[0046]
Incidentally, in the above-described embodiment, the cooling water control valve 26 is provided with a mechanism for controlling the amount of cooling water flowing through the bypass water channel 101 according to the load of the engine 1, but the present invention is implemented even if this mechanism is eliminated. can do. However, in this case, since the cooling water temperature is maintained at about 80 ° C., the cooling water temperature T_{W 3}Is preferably about 90 ° C.
[0047]
In the above-described embodiment, the heat of the cooling water is stored by storing the high-temperature cooling water in the heat storage tank 4._ThreeCOONa, Ba (OH)₂-8H₂A heat storage tank made of a latent heat storage material such as O may be used.
In the above-described embodiment, the present invention is applied to a vehicle having a reheat type air conditioner. However, the present invention adjusts the ratio of the air volume flowing through the heater core 5 and the air volume bypassing the heater core 5 to adjust the ratio between the air volume inside the vehicle interior. The present invention can also be applied to a vehicle having a so-called air mix type air conditioner that adjusts the temperature of blown air.
[0048]
The present invention can also be applied to a so-called hybrid vehicle that travels using both the engine 1 and a traveling electric motor.
[Brief description of the drawings]
FIG. 1 is a cooling water circuit diagram (cooling water heat retention mode) according to an embodiment of the present invention.
FIG. 2 is a block diagram of a control system according to the present embodiment.
FIG. 3 is a cross-sectional view showing a state in which a cooling water control valve is assembled to a heat storage tank.
4 is a cross-sectional view taken along the line AA of FIG. 1 (cooling water heat retention mode).
FIG. 5 is a cooling water circuit diagram showing a cooling water flow in an engine warm-up promotion mode.
6 is a cross-sectional view taken along the line AA in FIG. 1 showing an engine warm-up promotion mode.
FIG. 7 is a cooling water circuit diagram showing a cooling water flow in an immediate heating mode.
8 is a cross-sectional view taken along the line AA of FIG. 1 showing an immediate effect heating mode.
FIG. 9 is a cooling water circuit diagram showing a cooling water flow in a cold water holding mode.
10 is a cross-sectional view taken along line AA of FIG. 1 showing a cold water holding mode.
FIG. 11 is a cooling water circuit diagram showing a cooling water flow in a heat storage mode A.
12 is a cross-sectional view taken along the line AA in FIG.
13 is a cooling water circuit diagram showing a cooling water flow in a heat storage mode B. FIG.
14 is a cross-sectional view taken along the line AA in FIG.
FIG. 15 is a flowchart showing the operation of a cooling water control valve corresponding to each mode (steps 100 to 190).
FIG. 16 is a flowchart showing the operation of the cooling water control valve corresponding to each mode (steps 200 to 310).
[Explanation of symbols]
1 ... Engine (water-cooled internal combustion engine), 2 ... Radiator,
3 ... Water pump, 4 ... Thermal storage tank, 5 ... Heater core,
9 ... Intake heat exchanger, 11 ... A / T heat exchanger, 12 ... E / O heat exchanger,
13 ... Thermostat (temperature sensing valve), 14 ... Check valve, 15 ... Electric pump,
100 ... Radiator channel, 101 ... Bypass channel (temperature sensitive channel),
261: housing, 262: control valve body.

Claims (3)

A water-cooled internal combustion engine (1);
A mechanical pump (3) for obtaining driving force from the water-cooled internal combustion engine (1) and circulating the cooling water;
A heat storage tank (4) in which cooling water discharged from the water-cooled internal combustion engine (1) is guided to store heat of the cooling water;
A cooling water control valve (26) for opening and closing at least an opening channel (45) for flowing cooling water into and out of the heat storage tank (4);
An electric pump (15) disposed in a cooling water passage ( 103 ) connecting the water-cooled internal combustion engine (1) and the heat storage tank (4) and driven by electric power;
A radiator (2) for radiating heat of cooling water discharged from the water-cooled internal combustion engine (1);
A radiator water channel (100) for returning cooling water discharged from the water-cooled internal combustion engine (1) to the water-cooled internal combustion engine (1) through the radiator (2);
It has a temperature sensing operation part (13a) whose volume changes in accordance with the temperature of the cooling water discharged from the water-cooled internal combustion engine (1), and the radiator water channel (100) due to the volume change of the temperature sensing operation part (13a). A temperature sensing valve (13) that opens and closes;
Temperature detecting means (21) for detecting the temperature of cooling water discharged from the water-cooled internal combustion engine (1);
A control device (18) for controlling the operation of the cooling water control valve (26) and the electric pump (15) based on the cooling water temperature detected by the temperature detection means (21);
The control device (18) operates the cooling water control valve (26) to the open state of the opening flow path (45) when the cooling water temperature rises to a first predetermined temperature or higher, thereby the water cooling type. Setting a first heat storage mode in which cooling water discharged from the internal combustion engine (1) flows into the heat storage tank (4);
When the cooling water temperature is higher than the first predetermined temperature and rises above a second predetermined temperature corresponding to the cooling water temperature at which the temperature sensing valve (13) starts to open, the cooling water The control valve (26) is operated to the open state of the open flow path (45), and the electric pump (15) is operated to supply cooling water discharged from the water-cooled internal combustion engine (1) to the electric pump ( A cooling water circuit for an internal combustion engine, wherein a second heat storage mode for pumping toward the heat storage tank (4) is set according to 15) . A water-cooled internal combustion engine (1);
A mechanical pump (3) for obtaining driving force from the water-cooled internal combustion engine (1) and circulating the cooling water;
A heat storage tank (4) in which cooling water discharged from the water-cooled internal combustion engine (1) is guided to store heat of the cooling water;
An electric pump (15) disposed in a cooling water passage (103) connecting the water-cooled internal combustion engine (1) and the heat storage tank (4) and driven by electric power;
A radiator (2) for radiating heat of cooling water discharged from the water-cooled internal combustion engine (1);
A radiator water channel (100) for returning cooling water discharged from the water-cooled internal combustion engine (1) to the water-cooled internal combustion engine (1) through the radiator (2);
It has a temperature sensing operation part (13a) whose volume changes in accordance with the temperature of the cooling water discharged from the water-cooled internal combustion engine (1), and the radiator water channel (100) due to the volume change of the temperature sensing operation part (13a). A temperature sensing valve (13) that opens and closes;
Temperature detecting means (21) for detecting the temperature of cooling water discharged from the water-cooled internal combustion engine (1);
A control device (18) for controlling the operation of the electric pump (15) based on the coolant temperature detected by the temperature detection means (21);
A temperature-sensitive water channel (101) for guiding cooling water discharged from the water-cooled internal combustion engine (1) to the temperature-sensitive operation unit (13a);
The temperature-sensitive operation is performed by reducing the amount of heat provided to the temperature-sensitive operation unit (13a) in response to a decrease in the load of the water-cooled internal combustion engine (1) disposed in the temperature-sensitive water channel (101). Load response control means (18, 23, 26) for increasing the cooling water temperature at which the valve (13) starts to open;
When the load of the water-cooled internal combustion engine (1) reaches a cooling water temperature at which the temperature-sensitive operation valve (13) starts to open with the load of the water-cooled internal combustion engine (1) below a predetermined value, the control device (18) A cooling water circuit for an internal combustion engine, wherein the cooling water discharged from the water-cooled internal combustion engine (1) is pumped toward the heat storage tank (4). The control device (18) stops the electric pump when the amount of cooling water pumped by the electric pump (15) toward the heat storage tank (4) exceeds the volume of the heat storage tank (4). The cooling water circuit for an internal combustion engine according to claim 1 or 2, characterized in that

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