JP2002137623A - Abnormality deciding device for heat storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide an abnormality of a heat storage device by an abnormality decision means for deciding the presence or absence of the abnormality of the heat storage device based on an electrical state on an electric heater for heating a heating medium stored in a heat insulating container of the heat storage device. SOLUTION: This abnormality deciding device 19 of the heat storage device 1 is characterized by comprising the abnormality decision means P for deciding the presence or absence of the abnormality of the heat storage device 1 based on an electric state on a PTC heater 23, in the heat storage device 1 having the heat insulting container 3 for storing heat by storing engine cooling water which is heated during the operation of an engine and becomes a high temperature and maintaining a high temperature state of the engine cooling water, making the engine cooling water of the high temperature flow to temperature rising requiring portion 7, 9 and 21 provided in an engine cooling water circulating passage 5 as necessary and raising the temperature of the temperature rising requiring portions 7, 9 and 21 by performing heat exchanges at the temperature rising requiring portions 7, 9 and 21 by heat conveyed by the engine cooling water at the time and the PTC heater 23 for heating the engine cooling water stored in the heat insulating container 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for determining abnormality of a heat storage device, and more particularly to a device for determining abnormality of a heat storage device provided with an electric heater for heating a fluid stored in a heat retaining container.

[0002]

2. Description of the Related Art In an internal combustion engine, it is desired to enhance the startability by promoting warm-up especially in cold weather.

[0003] Therefore, engine cooling water (hereinafter referred to as "high-temperature engine cooling water") which has been heated during operation of the internal combustion engine and has become high temperature is stored in a heat retaining container of the heat storage device unless otherwise specified. The high-temperature state is maintained and heat is stored and kept warm, and the stored high-temperature engine cooling water is returned to the cooling water circulation path of the internal combustion engine from the warming container before or immediately after the next engine start. A circulating device, such as an electric water pump, circulates and feeds the water jacket, heater for the vehicle interior, and other places requiring temperature rise in the engine body on the circulation path to increase the warm-up efficiency and enhance the effectiveness of the heater for the vehicle interior. A so-called early warm-up technique is well known (for example, see Japanese Patent Application Laid-Open No. 9-323532). If the warming-up can be promoted by applying the early warming-up technique, the deterioration of the emission can be prevented. A system in which the engine cooling water circulates, such as an engine cooling water circulation path, a heat retaining container, and an electric water pump, is referred to as a circulation system.

[0004] The thermal insulation container is a bottle body such as a thermos bottle capable of maintaining the temperature of the high-temperature engine cooling water stored therein for a long time. However, even with such a heat retention container, the temperature of the engine cooling water stored therein will decrease over time unless it is replaced with new high-temperature engine cooling water.

More specifically, while the internal combustion engine is being driven, the high-temperature engine cooling water warmed by the water jacket circulates through the circulating system, and the high-temperature engine cooling water from the water jacket is constantly circulated in the heat retaining container. The engine cooling water in the thermal insulation container is maintained at a high temperature because it is poured and replaced with new high-temperature engine cooling water. However, when the engine stops, the internal combustion engine does not circulate the high-temperature engine cooling water. Therefore, until the next operation of the internal combustion engine, the high-temperature engine cooling water before the stop of the engine is stored in the heat retaining container as it is. In this case, if the stop time of the internal combustion engine is short, the rate of decrease in the temperature of the engine cooling water is small, so that there is no problem even if early warming is performed using the stored engine cooling water. But,
If the stoppage time of the internal combustion engine is long, no matter how much high-temperature engine cooling water is stored in the heat insulation container, the temperature of the engine cooling water decreases with time as described above. Therefore, in this case, it is inappropriate to use the engine cooling water in the heat retaining container as a heat medium for early warm-up.

Therefore, in the technology described in the above-mentioned publication, a PTC (Positive Temperature), which is an electric heater, is provided in a heat insulating container.
Coeficient) A heater is installed and the PTC heater is started by supplying power from a battery or the like while the engine is stopped, thereby heating the engine cooling water stored in the heat insulation container even while the engine is stopped. A technique for preventing the temperature from decreasing is disclosed.

[0007]

However, the above publication does not disclose a technique for detecting an abnormality in a heat storage device when the abnormality occurs in the heat storage device, and includes a heat storage device provided with an electric heater for heating a fluid stored in a heat retaining container. It is required to determine the abnormality of the device.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric heater for heating a heat medium stored in a heat retaining container of a heat storage device. It is to determine the presence or absence of an abnormality in the heat storage device based on the related electric state.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, the abnormality determination apparatus for a heat storage device of the present invention has the following configuration.

In other words, the present invention relates to a heat storage device comprising a heat storage container for storing a fluid and maintaining the temperature state of the fluid, and an electric heater for heating the fluid stored in the heat storage container. And an abnormality determining means for determining an abnormality of the heat storage device based on an electric state of the electric heater.

Further, the abnormality determination device of the heat storage device of the present invention is preferably applied to an internal combustion engine. In that case, it is preferable to adopt the following configuration.

That is, the abnormality determination device for a heat storage device according to the present invention stores a heat medium which has been heated to a high temperature during operation of an internal combustion engine and stores heat while maintaining a high temperature state of the heat medium. The heat medium is passed through a heat-raising required portion provided in a heat medium circulating path of the internal combustion engine, and at that time, the heat carried by the heat medium exchanges heat at the temperature-raising required portion to raise the temperature of the temperature-raising required portion Determining means for determining the presence or absence of an abnormality in the heat storage device based on an electric state related to the electric heater in a heat storage device having a heat retaining container for heating the heat medium stored in the heat retaining container. It is characterized by having.

The abnormality determination device for a heat storage device according to the present invention comprises the above-mentioned essential components, but is established even when the components are specifically as follows.

That is, the electric state includes, for example, a current value of an electric heater.

The electric value of the electric heater may be used as the electric state instead of the electric current value.

Further, the abnormality judgment by the abnormality judgment means can be made based on the temperature of the internal combustion engine.

Further, the determination as to whether or not the heat storage device has an abnormality by the abnormality determination means can also be made based on the electric power when the electric heater is energized and the temperature of the heat medium in the heat retaining container.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; [First Embodiment] A first embodiment will be described with reference to FIGS.

FIG. 1 is a schematic diagram showing a case where the abnormality determination apparatus for a heat storage device according to the present invention is applied to an internal combustion engine.

The heat storage device 1 has a heat retaining container 3 in which engine cooling water (hereinafter referred to as "heat medium") as a heat medium (fluid) which has been heated to a high temperature during operation of an engine I which is an internal combustion engine. "Hot engine cooling water") is stored. And
When necessary, that is, the high-temperature engine cooling water is circulated back from the heat retaining container 3 to the engine cooling water circulation path 5, which is a heat medium circulation path, prior to the next operation of the engine or immediately after the start of the engine. At this time, the water jacket 7 in the engine main body, the heater 9 for the vehicle compartment, and the AT are arranged on the engine cooling water circulation path 5 even when the engine is stopped due to heat carried by the high-temperature engine cooling water.
Heat exchange (including heat exchange by replacing the engine cooling water) is performed at a place where the temperature needs to be raised, such as the F warmer 21, to raise the temperature thereof.

The heat retaining container 3 is provided with a space between the inner and outer layers of the wall material so that the temperature of the engine cooling water stored therein can be maintained for a long time, and the space is evacuated to conduct heat, convection and heat.
A bottle like a thermos with a reduced level of radiation.

The inner wall of the heat retaining container 3 is filled with a heat storage material (not shown), whereby a heat storage space is defined in the heat retaining container 3, and the high-temperature engine cooling water is stored in the space.

An engine cooling water supply pipe 13 serving as a heat medium supply path for supplying the high temperature engine cooling water secured during the previous operation of the engine from the engine cooling water circulation path 5 is provided in the heat retaining container 3.
And an engine cooling water discharge pipe 15 serving as a heat medium discharge path for discharging high temperature engine cooling water from the heat retaining container 3 to the engine cooling water circulation path 5.
And is attached. Further, the engine cooling water supply pipe 13 is provided with an electric water pump 18 for forcibly circulating the engine cooling water through the engine cooling water circulation path 5. Engine I
During the operation, the electric water pump 18 assists an engine mechanical water pump (not shown) provided on the engine body to circulate the engine cooling water, but when the engine I has not started yet, the electric water pump 18 The engine cooling water is circulated by operating only 18.

As a result, the engine cooling water was separated by the heat retaining container 3 → the engine cooling water discharge pipe 15 → the valve device 20 arranged on the engine cooling water circulation path 5 to select the supply destination of the engine cooling water → the valve device 20. Water jacket 7, vehicle interior heater 9, ATF warmer 21
Required temperature rise, etc. → Engine cooling water supply pipe 13 → Heat insulation vessel 3
This is circulated prior to or immediately after the start of the engine I in the following order, so as to accelerate the warming up of the portion requiring the temperature increase.

The valve device 20 is provided with first to fourth four openings i to iv. The first opening i communicates with the engine cooling water circulation path 5 communicating with the engine I side, the second opening ii communicates with the engine cooling water circulation path 5 communicating with the ATF warmer 21, and the third opening iii communicates with the heat storage device 1. The fourth opening iv communicates with the engine cooling water circulation path 5 communicating with the
Is connected to the engine cooling water circulation passage 5 communicating with the vehicle interior heater 9.

The valve device 20 is provided, if necessary, for flowing the engine cooling water only from the third opening iii leading to the heat storage device 1 to the first opening i leading to the engine I side.
(See FIG. 2) and a case B in which the engine cooling water flows only from the third opening iii that communicates with the heat storage device 1 toward the second opening ii that communicates with the ATF warmer 21 (see FIG. 3).
And the case C (see FIG. 4) in which the engine cooling water flows only from the fourth opening iv side leading to the vehicle interior heater 9 to the first opening i leading to the engine I side.

As described above, the valve device 20 has the four openings i in order to exhibit the function of selecting the flow direction of the engine cooling water.
Iv, the valve device 20 is hereinafter referred to as a four-way valve 20 unless otherwise specified. Also,
The presence of the four-way valve 20 in the case A, the case B, and the case C means that the four-way valve 20 is at the position A, the position B, and the position C, respectively.

The ATF warmer 21 includes an AT oil (hereinafter, referred to as "ATF"), which is a working oil of an automatic transmission (hereinafter, referred to as "AT") 22, and an engine coolant when the engine coolant temperature is equal to or higher than a predetermined temperature. A heat exchanger that performs heat exchange between the two. Therefore, the ATF warmer 21 and the AT 22 are connected via an oil passage 22a through which the ATF flows. Then, in the ATF warmer 21 installed on the engine cooling water circulation path 5, the engine cooling water flowing through the engine cooling water circulation path 5 and the oil passage 2 from the AT 22.
AT circulated through ATF warmer 21 via 2a
Heat is exchanged with the F to increase the temperature of the ATF, thereby realizing early warm-up of the AT22.

Further, a PTC heater 23 which is an electric heater and directly heats the engine cooling water is provided in the heat retaining container 3 in a state of being connected to a battery 24 via a connection line 25.

In general, the PTC heater has a characteristic that the amount of heat generated varies depending on the temperature around the PTC heater. That is, in the case of the present embodiment, the PTC heater 23 is
The lower the temperature of the engine cooling water, the lower the ambient temperature, the lower the resistance value, resulting in a higher calorific value. Conversely, the higher the temperature of the engine cooling water, the higher the resistance value, and the lower the calorific value. Has characteristics.

When the temperature of the engine cooling water stored in the heat retaining container 3 is low, the calorific value of the PTC heater 23 increases, and when the temperature of the engine cooling water is high, the calorific value of the PTC heater 23 decreases.

Therefore, even if the temperature of the cooling water stored in the heat-retaining vessel 3 decreases with time, the high-temperature engine cooling water does not circulate due to the stoppage of the internal combustion engine. Since the PTC heater 23 operates normally according to the temperature of the surrounding engine cooling water and generates heat, the temperature of the engine cooling water stored in the heat retaining container 3 is kept constant. Temperature can be kept.

The term "constant temperature" as used herein means a sufficient temperature at which early warm-up can be effectively performed the next time the internal combustion engine is started. Then, the PTC heater 23 is provided with a heat generating capacity corresponding to the volume of the heat retaining container 3 so that the constant temperature can be maintained, or a sufficient amount of electric power for exhibiting the heat generating capacity can be secured.

The power supply to the PTC heater 23 is controlled by an ON / OFF switch 26 (hereinafter referred to as a "PTC heater switch 26") for interrupting the power supply to the PTC heater 23. An ammeter 27 for measuring a current value flowing through the PTC heater 23 is connected to the connection line 25.

Reference numerals 29 and 31 are provided in the cabin and the temperature sensor for detecting the temperature of the engine cooling water flowing through the outlet of the water jacket. The driver is provided when the heat storage device 1 is not operating normally. And a warning lamp that warns the passenger or the passenger that there is an abnormality in the heat storage device 1 having the PTC heater 23 or the battery 24. The engine cooling water temperature detected by the temperature sensor 29 is referred to as an engine outlet water temperature.

The electric water pump 18 and the four-way valve 2
0, ammeter 27, temperature sensor 29 and abnormal lamp 31
Is connected to the ECU 19 that controls the entire internal combustion engine.

The ECU 19 is composed of a digital computer and includes the following well-known components (not shown).

That is, the ECU 19 comprises a ROM (Read Only Memory) connected to each other by a bidirectional bus,
It has at least a RAM (random access memory), a CPU (microprocessor), an input interface circuit, and an output interface circuit.

The input interface circuit is electrically connected to instruments such as an ammeter 27 and a temperature sensor 29, and the output values of these instruments are supplied from the input interface circuit to the EC.
The electric signal is input into U19, and the electric signal is temporarily stored in the random access memory RAM.

Various application programs and various maps are stored in the read-only memory ROM. When the CPU executes the application programs in accordance with the operating state of the internal combustion engine, the maps and the output are executed according to the time. A signal is transmitted through a bidirectional bus to a read only memory ROM or the random access memory R.
It is called from the AM and used for execution of the application program. Then, based on the result, various devices such as the injector electrically connected to the output interface circuit, the four-way valve 20, the abnormal lamp 31, and the like are activated.

The application program P and the application program P described below, which are necessary for effectively determining whether or not the heat storage device 1 has an abnormality,
Is also included in the ROM.

The application program P will be described with reference to FIGS. 5 and 6, and with reference to FIG.

The application program P shown in FIGS. 5 and 6 includes steps 101 to 118. The application program P including these steps is executed by the RO of the ECU 19 as described above.
M and is called by the CPU as needed.

The processing in each of the above steps is all performed by the CPU of the ECU 19.

Incidentally, using the symbol S, for example, in step 10
If it is 1, it is abbreviated as S101.

Regarding the contents, the same applies to other application programs described later.

Although FIGS. 5 and 6 should normally be shown together on the same paper, they are separated by the space of the paper. The reference numeral (1) shown in FIG. 5 and the reference numeral (1) shown in FIG. 6 correspond to each other, and guide the transition destination of the process from FIG. 5 to FIG.

In FIG. 5, after the start of the engine I, the processing shifts to this routine.
Is a position A where the position is a state before the start of the engine I.
(See FIG. 2). The PTC heater switch 26 for interrupting the power supply to the PTC heater 23 is
Set to FF.

At S102, the temperature sensor 2 determines whether the engine outlet water temperature immediately after the start of the engine I is equal to or higher than a predetermined temperature.
9 to determine. The predetermined temperature means, for example, a temperature effective for realizing early warm-up of the AT 22. In this embodiment, the predetermined temperature is exemplified as 50 ° C.

When the determination is affirmative in S102, the process proceeds to S105, and when the determination is negative, the process proceeds to S103.

In S103, the electric water pump 18 is turned on. In addition. Since it is assumed that the engine I has been started, the engine mechanical water pump is also operating. Therefore, although the engine cooling water is circulating in the engine cooling water circulation path 5, the electric water pump 18
By operating as N, the engine cooling water stored in the heat retaining container 3 of the heat storage device 1 can be promptly supplied to any of the above-mentioned temperature-requiring locations as needed.

In S104, it is determined whether a predetermined time has elapsed since the electric water pump 18 was turned on in S103. Here, the predetermined time is a time required for the engine cooling water temperature to reach the temperature of 50 ° C. or more after the start of the engine I, and is a value obtained empirically. In this embodiment, the predetermined time is set to 20 sec. Illustrated. S10
If an affirmative determination is made in S4, the process proceeds to S105, and if a negative determination is made, this routine is repeated.

In S105, the four-way valve 20 is set to the position B (see FIG. 3), so that the engine cooling water stored in the heat retaining container 3 flows from the heat storage device 1 side to the ATF warmer 21 side. Therefore, the engine cooling water contributes to the early warm-up of the AT 22 both in the case where the determination is negative and in the case where the determination is affirmative in S102.

In S106, the engine outlet water temperature is set to S102.
It is determined whether the temperature is equal to or higher than another predetermined temperature higher than the predetermined temperature. The predetermined temperature in S106 is, for example, the vehicle interior heater 9
Means effective temperature for realizing early warm-up. However, the predetermined temperature differs depending on the type of the target engine, and is higher in the case of the lean-burn engine than in the case of the normal gasoline engine. In this case, for example, 60 ° C. or more is desirable.

If the determination is affirmative in S106, the routine proceeds to S107, and if the determination is negative, this routine is repeated.

In step S107, the electric water pump 18 is turned on.
The FF is set and the four-way valve 20 is set at the position C (see FIG. 4) so that the engine cooling water flows from the water jacket 7 from the vehicle interior heater 9 toward the engine I.

In the next S108, it is determined whether or not the engine I is stopped. If the determination is affirmative, the process proceeds to S109.
If a negative determination is made, this routine is repeated.

In S109, the four-way valve is moved to the position A (see FIG. 2).
And the heat storage container 3 is moved from the heat storage device 1 side to the engine I side.
The cooling water stored in the engine.

In S110, even when the engine I is stopped, the engine outlet water temperature is reduced to S106 before the engine is stopped.
It is determined whether the temperature is equal to or higher than the predetermined temperature described in the above. If the determination is affirmative, the process proceeds to S111; if the determination is negative, the process proceeds to S11.
Proceed to 3.

In step S111, the electric water pump 18 is turned on.
Set to N. At this time, since the engine I is already stopped, the engine mechanical water pump is in a stopped state (see S108).
, The engine cooling water stored in the heat retaining container 3 of the heat storage device 1 can be supplied to a location requiring a temperature rise.

In S112, it is determined whether a predetermined time has elapsed since the electric water pump 18 was turned on in S111. The term “predetermined time” here means that the high-temperature engine cooling water stored in the heat-retaining container 3 of the heat storage device 1 is discharged from the heat-retaining container 3 in an amount sufficient to effectively function in performing the engine warm-up. The time required for The engine cooling water having a lower temperature than the engine cooling water stored in the heat retaining container 3 flows into the heat retaining container 3 from the engine cooling water circulation path 5 in such a manner as to replace the discharge.

If the determination is affirmative in S112, the process proceeds to S113, and if the determination is negative, this routine is repeated.

In S113, the electric water pump 18 is turned on.
FF is performed and the PTC heater switch 26 is turned ON. As a result, the engine cooling water stored in the heat retaining container 3 is heated and its temperature rises to a temperature required for warm air.

In S114, the battery voltage is 12.5 Vo
It is determined whether or not it is equal to or more than lt.
The process proceeds to 115, and if a negative determination is made, the process proceeds to S118.

The battery voltage is used to operate the PTC heater 23. However, if the battery voltage becomes too low, the starter motor cannot be operated.
There is a possibility that the startability may be reduced by the PTC heater 23 provided for improving the startability. Therefore, the determination process for preventing this is S114.

S11 to proceed to when a positive determination is made in S114
In the step 5, the PTC current is measured by the ammeter 27 and the engine outlet water temperature is measured by the temperature sensor 29, and the intersection of the PTC current and the engine outlet water temperature is obtained by collating with the map of FIG.

The map M shown in FIG.
3 is a PTC current-engine water temperature diagram in which a PTC current flowing through a PTC heater 23, which is one of the electrical states related to No. 3, is taken, and an abscissa represents an engine coolant temperature which is a temperature of engine cooling water.

In the map M, a normal region indicating that the heat retaining container 3 is in a normal state and an abnormal region indicating that the heat retaining container 3 is abnormal are determined in advance by experiments and calculations. More specifically, in the map M of FIG. 7, a region indicating that the heat storage device 1 is functioning normally is a region indicated by oblique lines, and a region indicating that the heat storage device 1 is abnormal is a black region and a stitch. Area. Further, the black region is a region indicating that there is a decrease in the heat retention capacity of the heat storage device 1, and the stitch region is a region indicating that there is an abnormality in an electric circuit and a battery system (not shown) of the PTC heater 23.

Accordingly, the map M indicates whether there is an abnormal decrease in the heat retention capacity of the heat storage device 1 or whether there is an abnormality in the heat storage, based on the intersection between the PTC current and the engine outlet water temperature, in other words, the relative relationship between the PTC current and the engine outlet water temperature. It can be said that this is an abnormal portion determining means for determining whether there is an abnormality in the electric circuit or the battery system of the PTC heater 23 provided in the apparatus 1 or what is caused by the abnormality.

Step S116 is a step of judging whether or not the heat storage device 1 has an abnormality such as, for example, a decrease in heat retention as a result of collation with the map M of S115.
The process proceeds to 117, and returns to S113 if a negative determination is made.

In S117, the abnormal lamp 31 provided in the cabin is turned on.

The process returns to S114.

S11: proceed to the case where a negative determination is made in S114
At 8, the PTC heater switch 26 is turned off, and thereafter, the process proceeds to S117, where the abnormal lamp 31 is turned on. S1
If a negative determination is made in 14, the intersection on the map M in FIG. 7 is determined to be in the stitch area.

From the above description, S114 to S118 correspond to PT
It can be seen that the C heater 23 functions as an abnormality determination unit that determines whether or not there is an abnormality in the heat storage device 1 when heating and maintaining the engine cooling water stored in the heat retaining container 3 of the heat storage device 1. The application program P or the map M including the steps constituting the abnormality determination means
Can also be referred to as abnormality determination means. These application programs P and maps M are stored in ROM, and R
The attribute of the OM is in the ECU 19.

Therefore, the ECU 19 may be referred to as an abnormality determination device including abnormality determination means P and M for determining an abnormality of the heat storage device 1. Further, since the map M also functions as an abnormal location determination unit as described above, the ECU 19 may be referred to as an abnormality determination device including the abnormal location determination unit.

The application program P is used to keep the temperature of the high-temperature engine cooling water stored in the heat-retaining container 3 PTC.
Although the heater 23 is used, the application program P may incorporate a so-called preheat operation in which the PTC heater 23 is operated before the engine I operates. If the application program in that case is indicated by reference numeral P1, the application program P1 is as shown in FIGS.

This application program P1
The only difference from the application program P in FIGS. 5 and 6 is that the engine start in FIG. 5 is replaced with the condition that the door switch is turned on, which is an example of the preheating execution condition. Therefore, the same steps are denoted by the same step numbers, and description thereof is omitted.

In this embodiment, the case where the engine cooling water is directly heated by using the PTC heater 23 as the electric heater is exemplified, but the heating of the engine cooling water may be indirect. [Operation and Effect of First Embodiment] The operation and effect of the first embodiment will be described.

According to the present embodiment, if an abnormality occurs in the PTC heater 23 itself or the battery 24 that supplies power to the PTC heater 23 and an abnormality occurs in the heat retaining performance of the heat retaining container 3,
It becomes difficult to maintain the temperature of the engine cooling water at the constant temperature. However, the ECU 19, which is the abnormality determination device for the heat storage device 1 according to the present embodiment, determines whether or not there is an abnormality in the heat storage device 1 based on the current value and the engine temperature, which are the electrical states of the PTC heater 23. Since the determination unit (the application program P (P1) including the steps S114 to S118 and the map M) is provided, it is possible to determine whether the heat storage device 1 has an abnormality.

In addition, when it is determined that there is an abnormality in the heat storage device 1, an abnormal lamp 31 that can warn the driver of the abnormality is provided in the cabin. Will prompt the driver to do the repair.

The case where the abnormality is detected from the relationship between the amount of power supplied to the PTC heater 23 and the engine cooling water temperature has been described as an example. However, the present invention is not limited to this case. The abnormality may be detected from the relationship between the intake air temperature, the outside air temperature, and other engine temperatures that give the following.

The temperature of the engine cooling water in the heat retaining container 3 changes based on the value of the current flowing through the PTC heater 23. Therefore, when the current value is mainly used, the temperature of the engine cooling water is dependent on the current value. Therefore, the abnormality determining means determines that P
It may be said that the presence or absence of abnormality of the heat storage device 1 is determined based on a current value that is an electrical state related to the TC heater 23.

Further, the map M functions as an abnormal portion determining means for specifying an abnormal portion of the heat storage device 1 as described above. Therefore, the heat storage device 1 having the abnormal portion determination means
Is easy to find the repaired part because the repaired part can be determined. [Second Embodiment] Next, an abnormality determination device for a heat storage device according to a second embodiment will be described.

The difference between the heat storage device abnormality determination device according to the second embodiment and the first embodiment is in the application program for performing the abnormality determination. Therefore, only the application program according to the second embodiment that is different from the first embodiment will be described.

For the symbols related to the configuration appearing in the following description, see FIG.

In the second embodiment, the abnormality determining means of the heat storage device 1 determines whether the electric power supplied to the PTC heater 23 as the electric heater and the temperature of the engine cooling water as the heat medium in the heat retaining container 3 are determined. An application program P2 based on the application program is adopted. This application program P
2 will be described with reference to the flowchart of FIG.

This application program P2 is S
201 to S206.

In step S201, a signal (for example, a signal indicating that the door switch described in the first embodiment is turned on) that can predict that the engine I is started is sent to the ECU 19.
Upon entering, it is determined whether or not other preheat execution start conditions are satisfied. If the determination is affirmative, the process proceeds to S202, and if the determination is negative, the program P2 ends.

In S202, the CPU calculates and obtains the power to be supplied when the PTC heater 23 is energized.

In step S203, the power supply to the PTC heater 23 is temporarily stopped so that the PTC heater 23 is turned off.
By executing a current from the ECU 19 when the power supply to the PTC heater 23 is not performed before the execution of Step 2,
The resistance value of the PTC heater 23 when the TC heater 23 is not energized is determined. That is, the current is a current flowing only for obtaining the resistance value of the PTC heater 23 when the PTC heater 23 is not energized. At the same time, the engine cooling water temperature which is the temperature of the heat medium in the heat retaining container 3 is obtained from the resistance value.

To determine the temperature of the engine cooling water in the heat retaining container 3 from the resistance value, the lower the temperature of the PTC heater 23 is, the lower the resistance value is, and as a result, the calorific value is increased. The higher the value is, the higher the resistance value is, and the smaller the heat value is, the smaller the resistance value can be. Therefore, the temperature of the engine cooling water can be measured by using the characteristics of the PTC heater 23. That is, PTC
It can be said that the heater 23 exhibits a function of temperature detection in addition to the heat retention and heating of the engine cooling water.

In S204, an abnormality of the heat insulation container 3 or the PTC heater 23 is detected from the PTC power obtained in S202 and the engine cooling water temperature in the heat insulation container 3 obtained in S203. As a method of abnormality detection, for example, EC as follows
U19 does.

That is, the PTC heater switch 26 is turned off.
The engine cooling water temperature at that time can be seen from the resistance at the time of F. For example, if a large amount of electric power is flowing to the PTC heater 23 despite the high temperature of the engine cooling water in the heat retaining container 3, this is because the heat retaining power of the heat retaining container 3 has been reduced. to decide. Conversely, despite the fact that the temperature of the engine cooling water in the heat retaining container 3 is low, the PTC heater 23
If only a small amount of power is flowing to the PTC heater 23, it is determined that it is due to an abnormality in the PTC heater 23 itself, its circuit system, or the battery system.

In S205, it is determined whether or not an abnormality has occurred based on the result of the detection in S204.

When the temperature of the engine cooling water in the heat retaining container 3 is high and the PTC power is higher than a specific reference value, it is determined that the abnormality is caused by a decrease in the heat retaining power of the heat retaining container 3. I do. Also, the engine cooling water temperature is low and PTC
If the value of the power (power value) is small, it is determined that the PTC heater 23 itself or its circuit system or battery system is abnormal.

For this determination, for example, an engine cooling water temperature-PTC electric power diagram in which the temperature of the engine cooling water stored in the heat retaining container 3 is plotted on the vertical axis and the PTC power is plotted on the horizontal axis is mapped in advance (not shown). ) May be prepared and used. However, since the temperature can be obtained from the resistance value, the ECU 19 may calculate each time to determine the abnormality.

If the determination is affirmative in S205, the process proceeds to S206, and if the determination is negative, the program ends.

In step S206, the abnormality lamp 31 is turned on to notify the driver and the passenger of the event that an abnormality has occurred.
At the same time, the details of the abnormality are recorded in the RAM so that it is possible to know where the abnormality has occurred in repairing the heat storage device 1 later.

From the above description, at least S202 to S2
Reference numeral 05 indicates that the PTC heater 23 functions as an abnormality determination unit that determines whether or not the heat storage device 1 is abnormal when the engine cooling water stored in the heat storage container 3 of the heat storage device 1 is kept warm. Further, the present application program P including the above-mentioned steps constituting the abnormality determination means
2 and the map can also be referred to as abnormality determination means. These application programs P2 and maps are stored in ROM
The attributes of the ROM are in the ECU 19. Therefore, ECU 19 may be referred to as an abnormality determination device for heat storage device 1. [Operation and Effect of Second Embodiment] In the second embodiment, the PTC which is an electrical state related to the PTC heater 23 is used.
Abnormality determining means (S202 to S2) for determining an abnormality of the heat storage device 1, that is, an abnormality of the thermal insulation container 3 or the PTC heater 23, based on the electric power and the engine cooling water temperature in the thermal insulation container 3.
05, and the map), it is possible to determine whether or not the heat storage device 1 has an abnormality.

Since the temperature of the engine cooling water in the heat retaining container 3 changes based on the value of the power flowing through the PTC heater 23, the temperature of the engine cooling water is dependent on the value of the power when the power value is mainly used. . Therefore, the abnormality determining means determines that the PT
The presence or absence of an abnormality in the heat storage device can be determined based on a power value that is an electrical state related to the C heater 23.

[0101]

As described above, according to the heat storage device abnormality determining apparatus of the present invention, the abnormality of the heat storage device is determined based on the electric state of the electric heater for heating the heat medium stored in the heat retaining container of the heat storage device. The abnormality of the heat storage device can be determined by the abnormality determining means for determining the presence or absence of the heat storage device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of an abnormality determination device for a heat storage device of the present invention.

FIG. 2 shows a position A of a four-way valve.

FIG. 3 shows a position B of a four-way valve.

FIG. 4 is a diagram showing a position C of a four-way valve.

FIG. 5 is a part of a flowchart for describing an application program according to the first embodiment;

FIG. 6 is a part of a flowchart continuing from FIG. 5;

FIG. 7 is a map used when executing the application program according to the first embodiment;

FIG. 8 is a flowchart for explaining an application program according to another application example of the first embodiment;

FIG. 9 is a part of a flowchart continuing from FIG. 8;

FIG. 10 is a flowchart for explaining an application program according to a second embodiment of the abnormality determination apparatus for a heat storage device of the present invention.

[Explanation of symbols]

I Engine (Internal Combustion Engine) 1 Heat Storage Device 3 Heat Reservoir 5 Engine Cooling Water Circulation Path (Heat Medium Circulation Path) 7 Water Jacket (Necessary Temperature Rise) 9 Heater for Cabin (Necessary Temperature Rise) 13 Engine Cooling Water Supply Pipe 15 Engine cooling water discharge pipe 18 Electric water pump 19 ECU (heat storage device abnormality determination device) 20 Valve device (four-way valve) 21 ATF warmer 22 AT (necessary temperature rise) 22a Oil passage 23 PTC heater 24 Battery 25 Connection line 26 ON / OFF switch 27 Ammeter 29 Temperature sensor 31 Abnormal lamp i First opening of four-way valve ii Second opening of four-way valve iii Third opening of four-way valve iv First opening of four-way valve M map (abnormality determination means P application program (abnormality judgment means) P1 application program (abnormality judgment means) P2 application program Lamb (abnormality determining means)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F24F 5/00 102 F24F 5/00 102Z F24H 7/02 601 F24H 7/02 601A F28D 20/00 F28F 27 / 00 511J F28F 27/00 511 F28D 20/00 Z (72) Inventor Masakazu Tabata 1 Toyota Town, Toyota City, Aichi Prefecture F-term in Toyota Motor Corporation (Reference) 3L054 BG01 BG10 BH05

Claims (6)

[Claims] 1. A heat storage device comprising: a heat retaining container for storing a fluid and maintaining a temperature state of the fluid; and an electric heater for heating the fluid stored in the heat retaining container, wherein the electric condition related to the electric heater An abnormality determination device for a heat storage device, comprising: abnormality determination means for determining an abnormality in the heat storage device based on the abnormality. 2. A heat medium which has been heated to a high temperature during operation of the internal combustion engine is stored, heat is stored while maintaining a high temperature state of the heat medium, and the high temperature heat medium is circulated to the heat medium of the internal combustion engine when necessary. The heat is transferred to the required location provided on the road, and at that time, the heat carried by the heat medium exchanges heat at the required location to raise the temperature of the required location, and is stored in the thermal storage container. A heat storage device having an electric heater for heating the heat medium, further comprising: an abnormality determination unit configured to determine whether the heat storage device is abnormal based on an electrical state of the electric heater. Abnormality determination device. 3. The abnormality judging device according to claim 1, wherein the electric state is a current value of an electric heater. 4. The apparatus according to claim 1, wherein the electric state is a power value of an electric heater. 5. The apparatus according to claim 3, wherein the abnormality determination by the abnormality determining means is performed based on a temperature of the internal combustion engine. 6. The heat storage device according to claim 2, wherein the abnormality judgment of the heat storage device by the abnormality judgment means is made based on the electric power when the electric heater is energized and the temperature of the heat medium in the heat retaining container. Abnormality determination device for heat storage device.