JP2006161739A - Vehicle control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fuel consumption by using a heat storage system for temporarily storing engine cooling water in a heat-retaining state.
When an idling stop condition other than the engine cooling water temperature is satisfied (YES in S100), the engine ECU detects the engine cooling water temperature (S110), and the engine cooling water temperature becomes higher on the idling stop high temperature side. If it is equal to or higher than the threshold (NO in S120) and the temperature of the heat storage tank is sufficiently lower than the engine coolant temperature (YES in S130), an operation command is output to the electric water pump and the flow control valve is fully opened. A program including a step (S150, S160) of outputting a command to circulate cooling water to the radiator as a state is executed.
[Selection] Figure 2

Description

  The present invention relates to a vehicle control device equipped with a heat storage system that temporarily stores a liquid medium in a heat-retaining state, and in particular, supplies a high-temperature liquid medium to an internal combustion engine or supplies a low-temperature liquid medium to an internal combustion engine. The present invention relates to a vehicle control apparatus that controls the temperature of an internal combustion engine.

  When an internal combustion engine mounted in an automobile or the like is started in a cold state, the wall surface temperature of the intake port, the combustion chamber, etc. becomes low, so that it is difficult for the fuel to atomize and flame extinguishing occurs at the periphery of the combustion chamber This will cause a decrease in startability and a deterioration in exhaust emission.

  In order to solve such problems, a water-cooled internal combustion engine is provided with a heat storage device that retains high-temperature cooling water, and the internal combustion engine is supplied with cooling water stored in the heat storage device when the internal combustion engine is started. Techniques have been proposed to increase the temperature of the engine, thereby improving startability and speeding up warm-up.

  For example, an internal combustion engine provided with a heat storage device disclosed in Japanese Patent Application Laid-Open No. 2003-184553 (Patent Document 1) is formed in a cylinder head of the internal combustion engine, and a heat medium flow passage through which a heat medium flows, and a heat medium flow A heat storage device that retains and stores a part of the heat medium flowing through the passage, a first heat medium passage that guides the heat medium from the heat storage device to the heat medium flow passage, and a second that guides the heat medium from the heat medium flow passage to the heat storage device And a passage switching means for selectively conducting the first heat medium passage and the second heat medium passage.

  According to the internal combustion engine provided with this heat storage device, the passage switching means causes the first heat medium passage to conduct, so that the high-temperature heat medium stored in the heat storage device through the first heat medium passage passes through the first heat medium passage. While being directly supplied to the heat medium flow passage, the passage switching means causes the second heat medium passage to conduct, so that the high-temperature heat medium in the heat medium flow passage directly passes through the second heat medium passage. Is supplied to the heat storage device. When the heat medium is directly exchanged between the heat medium flow passage and the heat storage device in this way, heat loss when supplying the heat medium from the heat storage device to the heat medium flow passage is minimized. In addition, heat loss when supplying the heat medium from the heat medium flow path to the heat storage device is also suppressed to a minimum. As a result, even if the heat medium in the heat medium flow passage has a small amount of heat, the small amount of heat is efficiently stored in the heat storage device.

  Also, from a viewpoint completely different from such a heat storage device, from the viewpoint of global warming prevention and resource saving, when the vehicle stops at a red light at an intersection or the like, the engine is automatically stopped and the vehicle starts running again. When the driver operates the engine (for example, when the accelerator pedal is depressed, the brake pedal is depressed, the shift lever is switched to the forward drive position, etc.), the engine is restarted. It is also called a running system or an engine automatic stop and start system (hereinafter sometimes referred to as an eco-run system). In this system, when the engine is restarted, the crankshaft is rotated by an electric motor such as a motor generator or a starter motor using the power of the secondary battery mounted on the vehicle to restart the engine.

  For example, Japanese Patent Laid-Open No. 2003-201882 (Patent Document 2) performs automatic stop / return control that automatically changes the engine between a stopped state and an operating state based on a predetermined stop condition or return condition. In a vehicle engine control device capable of cooling the engine by a cooling device driven by the power of the engine, continuous high-speed traveling in which the vehicle continuously travels at a vehicle speed of a predetermined value or more for a predetermined time or longer is possible. A traveling state determining means for determining whether or not the vehicle has been performed; and an automatic stop prohibiting means for prohibiting the automatic engine stop control when the stop condition is satisfied after it is determined that continuous high-speed traveling has been performed. .

According to the engine control apparatus for a vehicle, engine stop control is prohibited when the stop condition is satisfied after it is determined that the vehicle has been continuously driven at a high speed. Therefore, a decrease in the function of the cooling device is suppressed. As a result, an increase in engine temperature can be suppressed.
JP 2003-184553 A JP 2003-201882 A

  However, since the internal combustion engine provided with the heat storage device disclosed in Patent Document 1 and the engine control device for a vehicle disclosed in Patent Document 2 are made for completely different purposes, it is possible to associate them with each other. Have difficulty. Further, for example, in the vehicle engine control device disclosed in Patent Document 2, there is no disclosure of a measure for improving the fuel consumption by making the engine stop time as long as possible.

  The present invention has been made in order to solve the above-described problems, and the purpose thereof is to mount a heat storage system that improves fuel consumption by using a heat storage system that temporarily stores a liquid medium in a heat-retaining state. It is to provide a control device for a vehicle.

  The control device for a vehicle according to the first invention controls a vehicle equipped with an idling stop system that temporarily stops the internal combustion engine when the state of the vehicle satisfies a predetermined condition. The vehicle includes a storage means for keeping a part of a liquid medium circulating in a flow path provided in the internal combustion engine, and a circulation means for circulating the liquid medium in the storage means between the internal combustion engine and the vehicle. And will be installed. The control device satisfies a predetermined condition related to the internal combustion engine based on the detection means for detecting the temperature of the internal combustion engine when the vehicle is temporarily stopped and the detected temperature of the internal combustion engine. And a control means for controlling the circulation means to supply the liquid medium in the storage means to the internal combustion engine.

  According to the first invention, in order to allow idling stop, the temperature of the internal combustion engine (the temperature of the liquid medium that cools the internal combustion engine) is required to be higher than a predetermined lower limit value and lower than an upper limit value. It is done. This is because if it is higher than the upper limit value, the liquid medium circulation pump driven by the internal combustion engine stops and causes overheating, and if it is lower than the lower limit value, it causes deterioration in drivability and emission. Therefore, when the temperature of the internal combustion engine is higher than the upper limit value, the control means controls the circulation means so as to supply a low-temperature liquid medium in the storage means to the internal combustion engine, thereby reducing the temperature of the internal combustion engine. Satisfy the stop condition. Further, the control means controls the circulation means so as to supply the high-temperature liquid medium in the storage means to the internal combustion engine when the temperature of the internal combustion engine is lower than the lower limit value, and raises the temperature of the internal combustion engine, thereby idling. Satisfy the stop condition. When the idling stop condition is satisfied, the internal combustion engine is stopped when the vehicle is temporarily stopped, and the fuel consumption can be improved. As a result, it is possible to provide a control device for a vehicle equipped with a heat storage system that improves fuel efficiency using a heat storage system that temporarily stores a liquid medium in a heat-retaining state.

  A vehicle control device according to a second aspect of the invention controls a vehicle equipped with an idling stop system that temporarily stops the internal combustion engine when the state of the vehicle satisfies a predetermined condition. A vehicle includes a storage means for keeping a part of a liquid medium circulating in a flow path provided in the internal combustion engine, and a circulation means for circulating the liquid medium in the storage means between the internal combustion engine and the vehicle. Is installed. The control device includes a predicting unit for predicting that the vehicle is temporarily stopped, a detecting unit for detecting the temperature of the internal combustion engine when the stop is predicted, and the detected temperature of the internal combustion engine. And a control means for controlling the circulation means so as to supply the liquid medium in the storage means to the internal combustion engine so as to satisfy a predetermined condition relating to the internal combustion engine.

  According to the second invention, in order to allow idling stop, when the vehicle is temporarily stopped, the temperature of the internal combustion engine (the temperature of the liquid medium that cools the internal combustion engine) is lower than a predetermined lower limit value. It is required to be higher and lower than the upper limit value. Therefore, the control means predicts that the vehicle will temporarily stop, and the temperature of the internal combustion engine is likely to be higher or higher than the upper limit value at the time of temporary stop (when determining the idling stop condition). If there is, the circulating means is controlled so as to supply the low-temperature liquid medium in the storage means to the internal combustion engine in advance to lower the temperature of the internal combustion engine, and the idling stop condition is satisfied at the time of temporary stop. Further, the control means predicts that the vehicle is temporarily stopped, and the temperature of the internal combustion engine is likely to be lower or lower than the lower limit value at the time of temporary stop (when the idling stop condition is determined). If so, the circulating means is controlled so as to supply the high-temperature liquid medium in the storage means to the internal combustion engine in advance to raise the temperature of the internal combustion engine, and the idling stop condition is satisfied at the time of temporary stop. When the idling stop condition is satisfied, the internal combustion engine is stopped when the vehicle is temporarily stopped, and the fuel consumption can be improved. As a result, it is possible to provide a control device for a vehicle equipped with a heat storage system that improves fuel efficiency using a heat storage system that temporarily stores a liquid medium in a heat-retaining state.

  In the vehicle control apparatus according to the third aspect of the invention, in addition to the configuration of the second aspect of the invention, the prediction means stops the vehicle temporarily based on at least one of the vehicle speed and the vehicle deceleration. Means for predicting that.

  According to the third invention, for example, when the vehicle speed is low and the deceleration is large, it can be predicted that the vehicle temporarily stops.

  In the vehicle control apparatus according to the fourth invention, in addition to the configuration of any one of the first to third inventions, the storage means stores a liquid medium having a temperature lower than that of the internal combustion engine. The predetermined condition is a condition that the temperature of the internal combustion engine is lower than the predetermined temperature. The control means includes means for controlling the circulation means so that the temperature of the internal combustion engine becomes lower than a predetermined temperature by supplying a low temperature liquid medium to the internal combustion engine.

  According to the fourth invention, the storage means stores a liquid medium having a temperature lower than that of the internal combustion engine, and the temperature of the internal combustion engine can be lowered using the liquid medium. When the temperature of the internal combustion engine is higher than the upper limit value, the control means controls the circulation means so as to supply a low temperature liquid medium in the storage means to the internal combustion engine, thereby lowering the temperature of the internal combustion engine, and the idling stop condition To satisfy. Further, the control means predicts that the vehicle is temporarily stopped, and the temperature of the internal combustion engine is likely to be higher or higher than the upper limit value during the temporary stop (when the idling stop condition is determined). If there is, the circulating means is controlled so as to supply the low-temperature liquid medium in the storage means to the internal combustion engine in advance to lower the temperature of the internal combustion engine, and the idling stop condition is satisfied at the time of temporary stop.

  In the vehicle control apparatus according to the fifth aspect of the invention, in addition to the configuration of any one of the first to fourth aspects, the vehicle is further equipped with a heat radiating means for radiating the liquid medium. The control means includes a means for controlling the circulation means so as to supply the liquid medium in the storage means to the internal combustion engine and to supply the liquid medium to the heat dissipation means.

  According to the fifth aspect of the invention, since the heat amount of the liquid medium is released by the heat radiating means and the temperature of the liquid medium is lowered, the temperature of the internal combustion engine can be lowered more efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<First Embodiment>
In FIG. 1, the control block diagram of the thermal storage system which is a control object of the control apparatus which concerns on this Embodiment is shown.

  The heat storage system shown in FIG. 1 is applied to a vehicle equipped with an internal combustion engine (engine). This vehicle may be a vehicle equipped only with an engine or a hybrid vehicle equipped with an engine and a motor driven by a battery.

  The vehicle is also equipped with an idling stop system. The idling stop system automatically stops the engine when the vehicle stops at a red light at an intersection or the like, and restarts the engine when the driver operates to start running again. For example, the accelerator opening is 0, 1 second or more has elapsed after the shift operation, the vehicle speed is 0, the engine speed is 1000 rpm or less, and the vehicle stops on the uphill or downhill road. If the engine coolant temperature is within a predetermined range, idling stop is permitted and the engine is temporarily stopped.

  As shown in FIG. 1, this heat storage system keeps a part of cooling water flowing through a cooling water flow path provided in a cylinder head (hereinafter referred to as a head) 100 and a cylinder block 110 in a heat storage tank 310. The cooling water is stored and supplied to the head 100 and the cylinder block 110 from the heat storage tank 310 as necessary. Cooling water is circulated by the mechanical water pump 200 between the head 100 and the cylinder block 110 and the radiator 400 or the radiator bypass passage 410. The flow rate control valve 430 controls which of the radiator 400 and the radiator bypass passage 410 passes through.

  Cooling water is supplied from the heat storage tank 310 to the head 100 and the cylinder block 110 by the electric water pump 300. By driving the electric water pump 300, the cooling water (hot water or cold water) in the heat storage tank 310 is supplied to the head 100, the cylinder block 110, the heater core 500, etc. via the three-way valve 600. . The three-way valve 600 is in a fully closed state, a fully open state (port A, port B, and port C are in communication), port A and port B are in communication, port A and port C are in communication, port B and port C Can be realized in five different states.

  Further, as temperature sensors of this heat storage system, an engine coolant temperature sensor 120 provided at the coolant outlet portion of the head 100, a heat storage tank outlet temperature sensor 320 provided on the outlet side of the heat storage tank 310, and a radiator 400 A radiator outlet water temperature sensor 420 provided at the outlet is provided. Signals from these temperature sensors are input to an engine ECU (Electronic Control Unit) 1000.

  Engine ECU 1000 controls electric water pump 300, three-way valve 600, and flow control valve 430. The flow rate control valve 430 can control the flow rate of the cooling water flowing through the radiator 400 and the flow rate of the cooling water flowing through the radiator bypass passage 410 by changing the control duty. At this time, the flow rate control valve 430 can flow cooling water only to the radiator 400, only to the radiator bypass passage 410, and to the radiator 400 and the radiator bypass passage 410. When the flow control valve 430 receives a fully open command signal from the engine ECU 1000, the flow control valve 430 controls the flow rate so that the entire amount of cooling water flows to the radiator 400. Further, when the flow control valve 430 receives a full-close command signal from the engine ECU 1000, the flow control valve 430 controls the flow rate so that the entire amount of cooling water flows through the radiator bypass passage 410. Further, the flow control valve 430 can receive a command signal from the engine ECU 1000 and control the flow rate so that a part of the cooling water flows to the radiator 400 and the remaining cooling water flows to the radiator bypass passage 410. .

  Further, engine ECU 1000 can control the discharge rate of electric water pump 300 by changing the control duty of the motor that drives electric water pump 300 to control the number of revolutions of the motor. Further, this control may be performed by making the voltage of the motor of the electric water pump 300 variable. Further, by changing the energization time of the motor of the electric water pump 300, the driving time of the electric water pump 300 is controlled to control the total amount of cooling water discharged from the electric water pump 300. Good.

  A control structure of a program executed by engine ECU 1000 of FIG. 1 will be described with reference to FIG.

  In step (hereinafter step is abbreviated as S) 100, engine ECU 1000 determines whether an idling stop condition other than the engine coolant temperature is satisfied. This determination is made, for example, when the accelerator opening is 0, 1 second or more has elapsed after the shift operation, the vehicle speed is 0, the engine speed is 1000 rpm or less, and the vehicle is on an uphill road or downhill road. It is not stopped at all. Further, the idling stop condition for the engine coolant temperature is that the engine coolant temperature is lower than a predetermined idling stop high temperature side threshold value and higher than the idling stop low temperature side threshold value. If an idling stop condition other than the engine coolant temperature is satisfied (YES in S100), the process proceeds to S110. If not (NO in S100), the process returns to S100.

  In S110, engine ECU 1000 detects engine cooling water temperature THW (1) and heat storage tank water temperature THW (2). At this time, the engine coolant temperature THW (1) is input from the engine coolant temperature sensor 120 to the engine ECU 1000, and the heat storage tank water temperature THW (2) is input from the heat storage tank outlet water temperature sensor 320 to the engine ECU 1000. Each is detected based on the received signal.

  In S120, engine ECU 1000 determines whether engine coolant temperature THW (1) <idling stop high temperature side threshold value or not. If engine coolant temperature THW (1) <idling stop high temperature side threshold value (YES in S120), the process proceeds to S170. If not (NO in S120), the process proceeds to S130.

  In S130, engine ECU 1000 determines whether or not heat storage tank water temperature THW (2) <engine cooling water temperature THW (1) -α (α> 0). That is, the heat storage tank water temperature THW (2) is lower than the value obtained by subtracting a predetermined positive value α from the engine cooling water temperature THW (1) (the cooling water in the heat storage tank 310 is lower than the engine cooling water temperature by α minutes). Or lower). If heat storage tank water temperature THW (2) <engine cooling water temperature THW (1) −α (YES in S130), the process proceeds to S140. Otherwise (NO at S130), this process ends.

  In S140, engine ECU 1000 determines whether or not there is a heating request. This determination is made based on the operation signal of the air conditioner in the passenger compartment input to engine ECU 1000. If there is a heating request (YES in S140), the process proceeds to S150. If not (NO in S140), the process proceeds to S160.

  In S150, engine ECU 1000 outputs an operation command to electric water pump 300. In addition, a command signal is output to the three-way valve 600 so that cooling water flows from port A to port B and from port A to port C. In addition, a command signal (full open command signal) that opens the flow control valve 430 fully is output. When the flow control valve 430 receives this fully open command signal, the flow control valve 430 controls so that the entire amount of cooling water flows to the radiator 400.

  In S160, engine ECU 1000 outputs an operation command to electric water pump 300. Further, a command signal is output so that the cooling water flows from port A to port B through the three-way valve 600. Further, a fully open command is output to the flow control valve 430.

  In S170, engine ECU 1000 determines whether or not an idling stop condition is satisfied. If the idling stop condition is satisfied (YES in S170), the process proceeds to S180. If not (NO in S170), the process proceeds to S190.

  In S180, engine ECU 1000 permits idling stop. In S190, engine ECU 1000 prohibits idling stop. After the process of S180, the process is returned to S170, and it is determined again whether or not the idling stop condition is satisfied. When the idling stop condition is not satisfied, the idling stop is prohibited. When idling stop is permitted, fuel supply to the engine is suspended and the engine is temporarily stopped.

  The operation of the control device for the heat storage system according to the present embodiment based on the above-described structure and flowchart will be described.

  When the vehicle is temporarily stopped due to a red light or the like while the vehicle is running and an idling stop condition other than the engine coolant temperature is satisfied (YES in S100), the engine coolant temperature THW (1) and the heat storage tank water temperature THW (2 ) Is detected (S110).

  If engine head 100 and cylinder block 110 are at a high temperature and the engine coolant temperature is too high, it is determined that engine coolant temperature THW (1) is equal to or higher than the idling stop high temperature side threshold (NO in S120). In such a case, if the cooling water in heat storage tank 310 is sufficiently low (THW (2) <THW (1) -α is satisfied) (YES in S130), is there a heating request? It is determined whether or not (S140).

  If the cooling water temperature in heat storage tank 310 is sufficiently low (YES in S130) and there is a heating request (YES in S140), an operation command is output to electric water pump 300 and electric water is output. Cold water is supplied from the heat storage tank 310 to the head 100, the cylinder block 110, and the heater core 500 by the pump 300 through the three-way valve 600. Further, a fully open command signal is output to the flow control valve 430, and cooling water is supplied to the radiator 400.

  In addition, even if the cooling water in the heat storage tank 310 is meaningful for heat exchange in the heater core (if the outside air temperature is very low, the cooling water mixed with the cold water in the heat storage tank 310 is meaningful in the heat exchange in the heater core 500. However, if priority is given to cooling the engine, the cooling water may not be allowed to flow through the heater core 500 even if there is a heating request. Further, when there is no meaning in the heat exchange in the heater core 500 by the cooling water in the heat storage tank 310, for example, in the cooling water in which the outside air temperature is relatively high and the cold water in the heat storage tank 310 is mixed, the heat exchange in the heater core 500 is performed. If there is no meaning, the cooling water may not be circulated through the heater core 500 even if there is a heating request.

  When there is no heating request (NO in S140), the three-way valve 600 controls the cooling water not to flow through the heater core 500, and the cooling water in the heat storage tank 310 is supplied to the head 100 and the cylinder block 110.

  FIG. 3 shows the state of such an operation. As shown in FIG. 3, in the prior art, idling stop was not executed even when the vehicle stopped (vehicle speed V = 0) with the engine cooling water temperature exceeding the high temperature side threshold value as indicated by the alternate long and short dash line. .

  In the control device of the heat storage system according to the embodiment of the present invention, the cooling in the heat storage tank 310 is performed even when the engine cooling water temperature THW (1) is higher than the high temperature side threshold value with the vehicle stopped. When the water is sufficiently low, the cold water is supplied to the head 100 and the cylinder block 110 (time t (1)). As a result, the engine coolant temperature THW (1) can be made lower than the high temperature side threshold value, and can be removed from the idling stop prohibition region, and the idling stop temperature condition (high temperature side) can be satisfied. The idling stop condition is satisfied and the engine is stopped (time t (2)).

  As described above, according to the heat storage system according to the present embodiment and the engine ECU that is the control device thereof, an idling stop condition other than the engine coolant temperature is established (when the vehicle is temporarily stopped due to a red signal or the like), When the engine coolant temperature and the heat storage tank water temperature are detected and the engine coolant temperature is higher than the idling stop high temperature side threshold and the heat storage tank water temperature is sufficiently lower than the engine coolant temperature, the electric water pump To supply cold water in the heat storage tank to the engine. As a result, the engine cooling water temperature is lowered, and the idling stop condition related to the engine cooling water temperature is established, and idling can be stopped. This idling stop can improve fuel efficiency.

<Second Embodiment>
Hereinafter, the control apparatus for the heat storage system according to the second embodiment of the present invention will be described. The control block diagram of the heat storage system according to the present embodiment is the same as the control block diagram of the heat storage system according to the first embodiment described above. Therefore, detailed description thereof will not be repeated.

  In the control device for the heat storage system according to the present embodiment, unlike the control device for the heat storage system according to the first embodiment described above, the idling stop condition is satisfied based on the engine coolant temperature when the vehicle stops. Thus, the feature is that the cold water in the heat storage tank 310 is not supplied to the engine, but the vehicle is temporarily stopped and the cold water in the heat storage tank 310 is supplied to the engine in advance before the vehicle stops. is there.

  A control structure of a program executed by engine ECU 1000 will be described with reference to FIG. In the flowchart shown in FIG. 4, the same steps as those in the flowchart shown in FIG. 2 are given the same step numbers. The processing for them is the same. Therefore, detailed description thereof will not be repeated here.

  In S200, engine ECU 1000 detects vehicle speed V. In S210, engine ECU 1000 calculates time change rate dV / dt of vehicle speed V.

  In S220, engine ECU 1000 determines whether or not vehicle speed V <vehicle speed threshold and vehicle speed time change rate dV / dt <0. That is, it is determined whether the vehicle speed is sufficiently low and the vehicle is decelerating. If vehicle speed V <vehicle speed threshold and vehicle speed change rate dV / dt <0 (YES in S220), the process proceeds to S110. If not (NO in S220), the process returns to S200.

  The operation of the control device for the heat storage system according to the present embodiment based on the above structure and flowchart will be described with reference to FIG.

  Before the vehicle stops, the vehicle speed V is detected (S200), the time change rate dV / dt of the vehicle speed is calculated (S210), the vehicle speed V is lower than the vehicle speed threshold value, and the time change rate dV / dt of the vehicle speed is 0. If it is less than (YES in S220), it is predicted that the vehicle will temporarily stop. At this time, if engine cooling water temperature THW (1) is equal to or higher than the idling stop high temperature side threshold value (NO in S120), and the cooling water in heat storage tank 310 is sufficiently lower than the engine cooling water temperature (in S130) YES), even before the vehicle is stopped, the electric water pump 300 is operated and cold water is supplied from the heat storage tank 310 to the head 100 and the cylinder block 110. For this reason, as shown in FIG. 5, when the vehicle stops at time t (3), the engine coolant temperature THW (1) is already lower than the idling stop high temperature side threshold value, and the engine is cooled simultaneously with the vehicle stop. The idling stop condition related to the water temperature is established and the engine is stopped.

  As described above, according to the heat storage system according to the present embodiment and the engine ECU that is the control device thereof, the idling stop is executed earlier than the control device of the heat storage system according to the first embodiment described above. It is possible to improve fuel efficiency.

<Third Embodiment>
Hereinafter, the control apparatus for the heat storage system according to the third embodiment of the present invention will be described. In the present embodiment, as in the second embodiment, the control block diagram is the same as the control block diagram of the heat storage system in the first embodiment. Therefore, detailed description thereof will not be repeated here.

  In the control device according to the present embodiment, the engine cooling water temperature THW (1) is equal to or lower than the idling stop high temperature side threshold value while the vehicle is running and satisfies the idling stop condition related to the engine cooling water temperature. However, when the engine coolant temperature THW (1) is increasing, the cool water in the heat storage tank 310 is supplied to the engine.

  A control structure of a program executed by engine ECU 1000 will be described with reference to FIG. In the flowchart shown in FIG. 6, the same steps as those in the flowcharts shown in FIGS. 2 and 4 are given the same step numbers. The processing for them is the same. Therefore, detailed description thereof will not be repeated here.

  In S300, engine ECU 1000 determines whether or not engine coolant temperature THW (1) ≦ idling stop high temperature side threshold value. If engine coolant temperature THW (1) ≦ idling stop high temperature side threshold value (YES in S300), the process proceeds to S310. If not (NO in S300), the process proceeds to S130.

  In S310, engine ECU 1000 calculates time change rate dTHW (1) / dt of engine coolant temperature THW (1). In S320, engine ECU 1000 determines whether or not engine cooling water temperature THW (1) has a time change rate dTHW (1) / dt> γ. If engine cooling water temperature THW (1) has a time rate of change dTHW (1) / dt> γ (YES in S320), the process proceeds to S130. If not (NO in S320), the process proceeds to S170.

  The operation of the control device for the heat storage system according to the present embodiment based on the above-described structure and flowchart will be described with reference to FIG.

  If it is predicted that the vehicle will temporarily stop while the vehicle is traveling (YES in S220), engine coolant temperature THW (1) is detected (S110). When engine cooling water temperature THW (1) is equal to or lower than the idling stop high temperature side threshold value (YES in S300), engine cooling water temperature THW (1) has a time rate of change dTHW (1) / dt greater than γ ( If YES in S320, the engine coolant temperature THW (1) enters the idling stop prohibition region as indicated by the one-dot chain line in FIG. Therefore, when the cooling water in heat storage tank 310 is sufficiently low (YES in S130), electric water pump 300 is driven to supply the cold water in heat storage tank 310 to the engine (S150).

  In this case, as shown in FIG. 7, when the vehicle is predicted to temporarily stop, the engine coolant temperature THW (1) is lower than the high-temperature side threshold, but the engine coolant temperature THW (1). If the engine is in an upward trend, cold water is supplied to the engine, and when the vehicle stops, the engine cooling water temperature THW (1) is in the idling stop prohibition area as indicated by the alternate long and short dash line as in the prior art. Can be avoided.

  Therefore, as in the second embodiment, even when the vehicle is predicted to stop temporarily, even if the engine cooling water temperature at that time is below the high temperature side threshold, the engine cooling water temperature If there is an upward trend, supply cold water. If it does in this way, idling stop conditions will be materialized at the time of a vehicle stop, and idling stop time can be lengthened. As a result, fuel consumption can be further improved.

<Fourth embodiment>
Hereinafter, control block diagrams of other heat storage systems that can be used in common with FIGS. 2, 4, and 6 will be described.

  As shown in FIG. 8, this heat storage system is also controlled by engine ECU 1000 as in the first to third embodiments described above. A difference from the control block diagram shown in FIG. 1 is the position of the three-way valve 610.

  The three-way valve 610 has the same function as the three-way valve 610 of FIG. 1 described in the first embodiment, but the position is different. Also in such a heat storage system shown in FIG. 8, the engine ECU 1000 executes the program represented by the flowcharts shown in FIGS. 2, 4, and 6, thereby satisfying the idling stop condition or setting the idling stop condition. The time to be satisfied can be extended and fuel consumption can be improved.

<Modification>
In the above-described embodiment, when the engine coolant temperature is too high to satisfy the idling stop high temperature condition, the cold water in the heat storage tank is supplied to the engine to satisfy the idling stop condition. . However, contrary to this, when the engine coolant temperature is too low to satisfy the idling stop low temperature condition, the hot water in the heat storage tank is supplied to the engine to satisfy the idling stop condition. Can also be executed by the control device according to the present invention.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a control block diagram of the heat storage system which concerns on the 1st Embodiment of this invention. It is a figure which shows the flowchart which shows the control structure of the program performed by engine ECU of FIG. It is a figure which shows the timing chart in the thermal storage system which concerns on the 1st Embodiment of this invention. It is a figure which shows the flowchart which shows the control structure of the program performed by engine ECU of the thermal storage system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the timing chart in the thermal storage system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the flowchart which shows the control structure of the program performed by engine ECU of the thermal storage system which concerns on the 3rd Embodiment of this invention. It is a figure which shows the timing chart in the thermal storage system which concerns on the 3rd Embodiment of this invention. It is a control block diagram of the heat storage system which concerns on the 4th Embodiment of this invention.

Explanation of symbols

  100 Cylinder Head, 110 Cylinder Block, 120 Engine Cooling Water Temperature Sensor, 200 Mechanical Water Pump, 300 Electric Water Pump, 310 Thermal Storage Tank, 320 Thermal Storage Tank Outlet Temperature Sensor, 400 Radiator, 410 Radiator Bypass Path, 420 Radiator Outlet Water Temperature Sensor, 430 Flow control valve, 500 Heater core, 600, 610 Three-way valve, 1000 Engine ECU.

Claims (5)

A control apparatus for a vehicle equipped with an idling stop system that temporarily stops an internal combustion engine when a vehicle condition satisfies a predetermined condition, wherein the vehicle circulates through a flow path provided in the internal combustion engine A storage means for storing a part of the liquid medium to be kept warm, and a circulation means for circulating the liquid medium in the storage means between the internal combustion engine,
The controller is
Detecting means for detecting the temperature of the internal combustion engine when the vehicle temporarily stops;
Based on the detected temperature of the internal combustion engine, the circulating means is controlled to supply the liquid medium in the storage means to the internal combustion engine so as to satisfy a predetermined condition relating to the internal combustion engine. And a control means for the vehicle. A control apparatus for a vehicle equipped with an idling stop system that temporarily stops an internal combustion engine when a vehicle condition satisfies a predetermined condition, wherein the vehicle circulates through a flow path provided in the internal combustion engine A storage means for storing a part of the liquid medium to be kept warm, and a circulation means for circulating the liquid medium in the storage means between the internal combustion engine,
The controller is
Prediction means for predicting that the vehicle temporarily stops;
Detecting means for detecting the temperature of the internal combustion engine when the stop is predicted;
Based on the detected temperature of the internal combustion engine, the circulating means is controlled to supply the liquid medium in the storage means to the internal combustion engine so as to satisfy a predetermined condition relating to the internal combustion engine. And a control means for the vehicle.   The vehicle control according to claim 2, wherein the prediction means includes means for predicting that the vehicle temporarily stops based on at least one of a speed of the vehicle and a deceleration of the vehicle. apparatus. The storage means stores a liquid medium having a temperature lower than that of the internal combustion engine,
The predetermined condition is a condition that the temperature of the internal combustion engine is lower than a predetermined temperature,
The control means includes means for controlling the circulation means so that the temperature of the internal combustion engine becomes lower than the predetermined temperature by supplying the low temperature liquid medium to the internal combustion engine. The vehicle control device according to claim 1. The vehicle is further equipped with heat radiating means for radiating the liquid medium,
The control means controls the circulation means so as to supply the liquid medium in the storage means to the internal combustion engine, and controls the circulation means so as to supply the liquid medium to the heat dissipation means. The vehicle control device according to any one of claims 1 to 4, further comprising:

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