JP2014077479A - High pressure tank system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly continue system operation, by detecting a failed temperature sensor out of a plurality of temperature sensors.SOLUTION: An ECU 24 detects whether any of temperature sensors in gas tanks 11a, 11b has failed or not, out or a first and a second temperature sensors 21a and 22a in the first gas tank 11a, and a first and a second temperature sensors 21b and 22b in the second gas tank 11b. If the ECU 24 detects a failure of a temperature sensor in any of the gas tanks 11a, 11b, the ECU24 calculates differences between: detection values of respective temperature sensors in the gas tank 11a or 11b having temperature sensor failure; and detection values of respective temperature sensors in the another gas tank 11b or 11a. The ECU 24 determines that a temperature sensor having the largest difference is failed out of the plurality of temperature sensors in the gas tank 11a or 11b having temperature sensor failure, and recognizes temperature information of the gas tank 11a or 11b with the trouble using detection values of the other temperature sensors.

Description

  The present invention relates to a high pressure tank system.

Up to now, a plurality of gas tanks and a plurality of temperature sensors for detecting the temperature inside the plurality of gas tanks have been provided, and whether or not each temperature sensor is disconnected is determined, and each gas tank is based on the temperature inside each gas tank There is known a gas supply device that determines an open / close state of an open / close valve (see, for example, Patent Document 1).
A gas supply device that includes a plurality of hydrogen tanks and a plurality of temperature sensors that detect temperatures of the plurality of hydrogen tanks, and controls supply of hydrogen gas so that a temperature difference between the plurality of hydrogen tanks is reduced. Is known (see, for example, Patent Document 2).

JP 2012-77789 A International Publication No. 2005/010427

By the way, according to the gas supply device according to the prior art, when an abnormality occurs in any of the temperature sensors, the temperature inside the corresponding tank cannot be grasped, and various determination processes and gas There arises a problem that the supply cannot be controlled.
In order to solve such a problem, it is desired to accurately grasp which gas sensor has an abnormality and accurately grasp the temperature inside the corresponding tank.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a high-pressure tank system capable of detecting a temperature sensor in which an abnormality has occurred among a plurality of temperature sensors and appropriately continuing the operation of the system. It is said.

  In order to solve the above problems and achieve the object, a high-pressure tank system according to a first invention of the present invention includes a high-pressure gas tank (for example, the first gas tank 11a in the embodiment) and the high-pressure gas tank. A plurality of temperature sensors (for example, a first temperature sensor (tank1) 21a and a second temperature sensor (tank1) 22a in the embodiment) for detecting the temperature inside the high-pressure gas tank, and the plurality of temperature sensors Are different temperature sensors (for example, the first temperature sensor (tank 2) 21b and the second temperature sensor (tank 2) 22b in the embodiment, the external temperature sensor 41), and any one of the plurality of temperature sensors. An abnormality determination means (for example, ECU 24 in the embodiment) for determining whether or not an abnormality has occurred, and the plurality of temperature by the abnormality determination means. Temperature information acquisition means for acquiring information on the temperature inside the high-pressure gas tank using a detection value of the other temperature sensor when it is determined that an abnormality has occurred in any of the temperature sensors. (For example, the ECU 24 in the embodiment also serves as).

  Furthermore, in the high pressure tank system according to the second aspect of the present invention, when the abnormality determining means determines that an abnormality has occurred in any of the plurality of temperature sensors, each of the plurality of temperature sensors. The difference between the detected value of the sensor and the detected value of the other temperature sensor is calculated, and the temperature sensor (for example, the second temperature sensor 22a in the embodiment) in which the difference is maximized is abnormal. It is determined that

  Furthermore, the high-pressure tank system according to the third aspect of the present invention is configured such that the high-pressure gas tank is a first high-pressure gas tank (for example, the first gas tank 11a in the embodiment) and a gas supply system (for example, the embodiment). The second high pressure gas tank (for example, the second gas tank 11b in the embodiment) connected in parallel with the first high pressure gas tank to the fuel cell stack 1) in FIG. It is provided in the second high-pressure gas tank and detects the temperature inside the second high-pressure gas tank.

  Furthermore, in the high pressure tank system according to a fourth aspect of the present invention, the first high pressure gas tank and the second high pressure gas tank have different sizes or materials, and the temperature information acquisition means includes the other By adding a predetermined correction value to the detected value of the temperature sensor, information on the temperature inside the first high-pressure gas tank is obtained.

  Furthermore, in the high pressure tank system according to the fifth aspect of the present invention, the other temperature sensor is arranged outside the high pressure gas tank and in the vicinity of the high pressure gas tank, and detects a temperature outside the high pressure gas tank.

  According to the high pressure tank system according to the first aspect of the present invention, even if an abnormality occurs in any one of the plurality of temperature sensors provided in the high pressure gas tank, the detection values of the other temperature sensors are used, Information on the temperature inside the high-pressure gas tank can be acquired, and the operation of the system can be continued properly.

  According to the high pressure tank system of the second aspect of the present invention, the temperature sensor in which an abnormality has occurred is detected from among the plurality of temperature sensors, and the information on the temperature inside the high pressure gas tank detected by this temperature sensor is It is possible to accurately grasp the detected value of the temperature sensor.

  According to the high pressure tank system of the third aspect of the present invention, using the detected value of the temperature inside the second high pressure gas tank connected in parallel with the first high pressure gas tank to the gas supply system, Information on the temperature inside the first high-pressure gas tank can be accurately grasped.

  According to the high pressure tank system according to the fourth aspect of the present invention, even when the first high pressure gas tank and the second high pressure gas tank have different sizes or materials, the second high pressure gas tank is used. By adding a predetermined correction value to the detected value of the temperature inside the gas tank, it is possible to accurately grasp the temperature information inside the first high-pressure gas tank.

  According to the high pressure tank system of the fifth aspect of the present invention, it is possible to accurately grasp the temperature information inside the high pressure gas tank using the detected value of the temperature outside the high pressure gas tank.

1 is a configuration diagram of a high-pressure tank system according to an embodiment of the present invention. It is a block diagram of the temperature detection circuit of the high pressure tank system which concerns on embodiment of this invention. It is a figure which shows the example of the output voltage characteristic of the 1st temperature sensor of the high pressure tank system which concerns on embodiment of this invention, and a 2nd temperature sensor. It is a block diagram of the high-pressure tank system which concerns on the 1st modification of embodiment of this invention. It is a block diagram of the high pressure tank system which concerns on the 2nd modification of embodiment of this invention. It is a figure which shows the example of the relationship between the temperature fall amount and pressure change amount of the high pressure tank system which concerns on the 2nd modification of embodiment of this invention. It is a figure which shows the example of the relationship between the temperature rise amount of the high pressure tank system which concerns on the 2nd modification of embodiment of this invention, a pressure change amount, and the elapsed time after filling.

  Hereinafter, a high-pressure tank system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the high-pressure tank system 10 according to the present embodiment is capable of supplying a reaction gas to the fuel cell stack 1, and has a plurality of high-pressure gas tanks 11 (for example, two first gas tanks 11) that store the reaction gas. Gas tank 11a and second gas tank 11b), a main stop valve 12 provided in each gas tank 11, a primary pressure-reducing valve 13 connected to each main stop valve 12, a primary pressure-reducing valve 13, and a fuel cell stack 1. An intermediate pressure device 14 connected between the high pressure sensor (P1) 15 provided in the flow path connecting each main stop valve 12 and the primary pressure reducing valve 13, and the primary pressure reducing valve 13 and the intermediate pressure device. And an intermediate pressure sensor (P2) 16 provided in a flow path connecting the

  Further, as shown in FIGS. 1 and 2, the high-pressure tank system 10 includes a plurality of temperature sensors that detect the temperature of the reaction gas stored in each gas tank 11, for example, two first temperatures for each gas tank 11. A sensor 21 and a second temperature sensor 22, a temperature detection circuit 23 provided for each gas tank 11, and an ECU 24 common to the plurality of gas tanks 11 are provided.

The first gas tank (tank1) 11a and the second gas tank (tank2) 11b are, for example, the same, and are connected in parallel to the fuel cell stack 1 constituting the reaction gas supply system.
A flow path connecting the main stop valve 12 of the first gas tank 11a and the primary pressure reducing valve 13, and a flow path connecting the main stop valve 12 of the main stop valve 12 of the second gas tank 11b and the primary pressure reducing valve 13. Are connected before the primary pressure reducing valve 13. As a result, the reaction gas supplied from the first gas tank 11 a and the reaction gas supplied from the second gas tank 11 b merge before the primary pressure reducing valve 13 and then flow to the primary pressure reducing valve 13.

  The first gas tank 11a includes two first temperature sensors (T1a) 21 and a second temperature sensor (T2a) 22 (for example, a first temperature sensor (for example, a first temperature sensor)) that detect the temperature of the reaction gas stored in the first gas tank 11a. tank 1) 21a and a second temperature sensor (tank 1) 22a).

  The second gas tank 11b includes two first temperature sensors (T1b) 21 and a second temperature sensor (T2b) 22 (for example, a first temperature sensor (for example, a first temperature sensor)) that detect the temperature of the reaction gas stored in the second gas tank 11b. tank 2) 21b and a second temperature sensor (tank 2) 22b).

  As shown in FIG. 2, the temperature detection circuit 23 includes a positive terminal P to which a power supply voltage Vcc is applied from a power supply (not shown), a ground terminal N, a first temperature sensor 21 connected in series, and A first branch piece made up of the first pull-up resistor 31 and a second branch piece made up of the second temperature sensor 22 and the second pull-up resistor 32 connected in series are provided. The first branch piece and the second branch piece are connected in parallel between the positive terminal P and the ground terminal N.

  The first and second temperature sensors 21 and 22 are PTC (positive temperature coefficient) thermistors that have a characteristic (positive characteristic) in which the electrical resistance changes with increasing temperature, or the electrical resistance tends to decrease with increasing temperature. An NTC (negative temperature coefficient) thermistor having a changing characteristic (negative characteristic) is used.

  The first and second pull-up resistors 31, 32 have appropriate fixed resistance values RP1, RP2.

  In the normal state of the temperature detection circuit 23, the current flowing through the first temperature sensor 21 includes a fixed resistance value RP1 of the first pull-up resistor 31 and a resistance value R1 of the first temperature sensor 21 that changes according to the temperature. , Will change according to. Along with this, the output voltage V1 of the first temperature sensor 21 (for example, the voltage across the positive electrode side and the negative electrode side of the first temperature sensor 21) V1 changes according to the temperature.

  In the normal state of the temperature detection circuit 23, the current flowing through the second temperature sensor 22 includes a fixed resistance value RP2 of the second pull-up resistor 32 and a resistance value R2 of the second temperature sensor 22 that changes according to the temperature. , Will change according to. Accordingly, the output voltage V2 of the second temperature sensor 22 (for example, the voltage across the positive electrode side and the negative electrode side of the second temperature sensor 22) V2 changes according to the temperature.

The first and second temperature sensors 21 and 22 of the temperature detection circuit 23 have the same electrical resistance characteristics (for example, negative characteristics) and the same output voltage characteristics.
With the same output voltage characteristic, for example, the resistance values R1 and R2 corresponding to the temperatures of the first and second temperature sensors 21 and 22 are the same at each temperature in the entire detection temperature range. Further, for example, the change characteristics of the output voltage according to the temperature change when the same constant current flows through each of the first and second temperature sensors 21 and 22 before being incorporated in the temperature detection circuit 23 are the same.

  The resistance values RP1 and RP2 of the first and second pull-up resistors 31 and 32 of the temperature detection circuit 23 are the first and second temperature sensors when the temperature detection circuit 23 is normal at each temperature in the entire detection temperature range. The output voltage difference (| V1-V2 |) of 21 and 22 is set to a value that is equal to or less than the sum of the output errors of the first and second temperature sensors 21 and 22.

  For example, the resistance values Ra and Rb of the first and second pull-up resistors 31 and 32 with respect to the first and second temperature sensors 21 and 22 having the same electric resistance characteristic and the same output voltage characteristic as a single unit. Are the same (Ra = Rb).

The ECU (Electronic Control Unit) 24 is data of a predetermined correspondence between the output voltages V1, V2 of the first and second temperature sensors 21, 22 and the temperature when the temperature detection circuit 23 is normal. Is stored in advance.
For example, the ECU 24 acquires the output voltages V1 and V2 output from the first and second temperature sensors 21 and 22 and searches the data stored in advance based on the output voltages V1 and V2. The detected values T1, T2 of the temperatures of the first and second temperature sensors 21, 22 are acquired.

  The ECU 24 detects abnormality of the first and second temperature sensors 21, 22 based on the detected values T1, T2 of the temperatures of the first and second temperature sensors 21, 22, (for example, offset abnormality, gain abnormality, disconnection, etc.). Detect the occurrence of

The ECU 24 detects the detected temperature difference (| T1) between the first and second temperature sensors 21 and 22 in the entire detected temperature range of the first and second temperature sensors 21 and 22 or in a wide temperature range or an appropriate temperature range. -T2 |) is calculated. When the detected temperature difference (| T1-T2 |) is larger than the added value of the detected temperature errors of the first and second temperature sensors 21, 22, an abnormality such as an offset abnormality, gain abnormality, or disconnection has occurred. judge.
On the other hand, when the detected temperature difference (| T1-T2 |) is equal to or smaller than the detected temperature error addition value, it is determined that no abnormality has occurred.

  The ECU 24 includes a plurality of temperature sensors of each gas tank 11 (for example, the first and second temperature sensors 21a and 22a of the first gas tank 11a and the first and second temperature sensors 21b and 22b of the second gas tank 11b). It is detected whether or not an abnormality has occurred in the temperature sensor of any gas tank 11. When it is detected that an abnormality has occurred in the temperature sensor of any gas tank 11, the detected value of each temperature sensor of this gas tank 11 and another temperature sensor (for example, the temperature sensor of another gas tank 11, etc.) ) Is calculated from the detected value. Then, it is determined that an abnormality has occurred in the temperature sensor in which the calculated difference is maximum among the plurality of temperature sensors in the gas tank 11 in which the abnormality has occurred in the temperature sensor, and the detection values of other temperature sensors are used. The temperature information of the gas tank 11 is acquired.

  The high-pressure tank system 10 according to the present embodiment has the above-described configuration. Next, the operation of the ECU 24 of the high-pressure tank system 10 will be described.

(Example)
Hereinafter, the operation of the ECU 24 when an abnormality occurs in the second temperature sensor 22a of the first gas tank 11a among the same first and second gas tanks 11a and 11b will be described.

  As shown in FIG. 3, the ECU 24 calculates a detected temperature difference (| T1a−T2a |) between the first and second temperature sensors 21a and 22a of the first gas tank 11a. Then, it is determined whether or not the detected temperature difference (| T1a−T2a |) is larger than the added value of the detected temperature errors of the first and second temperature sensors 21a and 22a. When the detected temperature difference (| T1a−T2a |) is larger than the added value of the detected temperature error, an abnormality such as an offset abnormality, gain abnormality, or disconnection has occurred in any temperature sensor of the first gas tank 11a. judge.

Next, the ECU 24 calculates the difference (T1a−Ttank2, T2a−Ttank2) between the detected values T1a and T2a of the temperatures of the first and second temperature sensors 21a and 22a and the detected temperature value Ttank2 of the second gas tank 11b. To do. Then, in the comparison of the absolute values of the differences, for example, based on the fact that | T2a−Ttank2 |> | T1a−Ttank2 |, it is determined that an abnormality has occurred in the second temperature sensor 22a having the largest difference.
The temperature detection value Ttank2 of the second gas tank 11b is, for example, an average value of the detection values T1b and T2b of the temperatures of the first and second temperature sensors 21b and 22b of the second gas tank 11b.

  Next, the ECU 24 detects a temperature detection value (based on the detection value T1a of the first temperature sensor 21a of the first gas tank 11a or the detection values T1b and T2b of the first and second temperature sensors 21b and 22b of the second gas tank 11b). For example, the temperature detection value Ttank2 of the second gas tank 11b) is employed as the temperature detection value of the first gas tank 11a.

  Note that after the ECU 24 determines that an abnormality has occurred in the second temperature sensor 22a of the first gas tank 11a, for example, the detected value T1a of the first temperature sensor 21a and the first and second values of the second gas tank 11b. 2) The detection values T1b, T2b of the temperature sensors 21b, 22b or the temperature detection value Ttank2 of the second gas tank 11b are compared, and it is determined whether there is an abnormality in the first temperature sensor 21a according to the comparison result. May be.

  As described above, according to the high-pressure tank system 10 according to this embodiment, even if an abnormality occurs in any of the plurality of temperature sensors provided in each of the plurality of gas tanks 11, an abnormality has occurred. Information on the temperature inside the gas tank 11 in which an abnormality has occurred can be acquired using the detected value of the temperature sensor of another gas tank 11 that is not present, and the operation of the system can be continued properly.

  Further, a temperature sensor in which an abnormality has occurred is detected from among a plurality of temperature sensors provided in each of the plurality of gas tanks 11, and information on the temperature inside the gas tank 11 detected by this temperature sensor is used as information of other gas tanks 11. It is possible to accurately grasp the detection value of the temperature sensor.

(First modification)
In the above-described embodiment, when the ECU 24 detects that a temperature sensor of any one of the gas tanks 11 is abnormal with respect to a plurality of the same gas tanks 11, It is assumed that the information is acquired using the detection value of the temperature sensor of the other gas tank 11. However, the present invention is not limited to this, and the temperature of the gas tank 11 is detected by using the detected value of the external temperature sensor (Tc) 41 that detects the temperature outside the plurality of gas tanks 11 as in the first modification shown in FIG. Information may be acquired.
The external temperature sensor (Tc) 41 is disposed outside and in the vicinity of the first and second gas tanks 11a and 11b, for example.

  The operation of the ECU 24 when an abnormality occurs in the second temperature sensor 22a of the first gas tank 11a among the same first and second gas tanks 11a and 11b in the first modification will be described below.

  The ECU 24 calculates a detected temperature difference (| T1a−T2a |) between the first and second temperature sensors 21a and 22a of the first gas tank 11a. Then, it is determined whether or not the detected temperature difference (| T1a−T2a |) is larger than the added value of the detected temperature errors of the first and second temperature sensors 21a and 22a. When the detected temperature difference (| T1a−T2a |) is larger than the added value of the detected temperature error, an abnormality such as an offset abnormality, gain abnormality, or disconnection has occurred in any temperature sensor of the first gas tank 11a. judge.

  Next, the ECU 24 calculates the difference (T1a-Tc, T2a-Tc) between the detected values T1a, T2a of the temperatures of the first and second temperature sensors 21a, 22a and the detected value Tc of the temperature of the external temperature sensor 41. calculate. Then, in the comparison of the absolute values of the differences, based on the fact that | T2a−Tc |> | T1a−Tc |, it is determined that an abnormality has occurred in the second temperature sensor 22a having the maximum difference.

  Next, the ECU 24 performs a predetermined correction on the temperature detection value (for example, the detection value Tc or the detection value Tc) based on the detection value T1a of the first temperature sensor 21a of the first gas tank 11a or the detection value Tc of the external temperature sensor 41. A value obtained by adding a value or the like) is adopted as a detected value of the temperature of the first gas tank 11a.

  The ECU 24 determines the detected value T1a of the first temperature sensor 21a, the detected value Tc of the external temperature sensor 41, and the like after determining that an abnormality has occurred in the second temperature sensor 22a of the first gas tank 11a. A comparison may be made to determine whether an abnormality has occurred in the first temperature sensor 21a according to the comparison result.

  According to the first modified example, it is possible to accurately grasp the temperature information inside the gas tank 11 where the abnormality has occurred, using the detected value Tc of the temperature outside the gas tank 11.

(Second modification)
In the above-described embodiment, the plurality of gas tanks 11 are the same. However, the present invention is not limited to this. As in the second modification shown in FIG. You may have a material etc.
In this second modification, the ECU 24 acquires information on the temperature of the gas tank 11 in which the temperature sensor is abnormal by adding a predetermined temperature correction value A to the detected value of the temperature sensor of the other gas tank 11.

  Hereinafter, in the second modification, the operation of the ECU 24 when an abnormality occurs in the second temperature sensor 22a of the first gas tank 11a out of the first and second gas tanks 11a and 11b having different internal volumes and materials will be described. explain.

  The ECU 24 calculates a detected temperature difference (| T1a−T2a |) between the first and second temperature sensors 21a and 22a of the first gas tank 11a. Then, it is determined whether or not the detected temperature difference (| T1a−T2a |) is larger than the added value of the detected temperature errors of the first and second temperature sensors 21a and 22a. When the detected temperature difference (| T1a−T2a |) is larger than the added value of the detected temperature error, an abnormality such as an offset abnormality, gain abnormality, or disconnection has occurred in any temperature sensor of the first gas tank 11a. judge.

  Next, the ECU 24 detects the difference (T1a− (Ttank2 + A) between the detected values T1a and T2a of the temperatures of the first and second temperature sensors 21a and 22a and the correction value (Ttank2 + A) of the detected temperature value Ttank2 of the second gas tank 11b. ), T2a- (Ttank2 + A)). Then, in the comparison of the absolute value of the difference, based on the fact that | T2a− (Ttank2 + A) |> | T1a− (Ttank2 + A) |, it is determined that an abnormality has occurred in the second temperature sensor 22a having the maximum difference. .

  Next, the ECU 24 detects a temperature detection value (based on the detection value T1a of the first temperature sensor 21a of the first gas tank 11a or the detection values T1b and T2b of the first and second temperature sensors 21b and 22b of the second gas tank 11b). For example, a correction value (for example, correction value (Ttank + A)) of the temperature detection value Ttank2 of the second gas tank 11b is employed as the temperature detection value of the first gas tank 11a.

  Note that after the ECU 24 determines that an abnormality has occurred in the second temperature sensor 22a of the first gas tank 11a, the detected value T1a of the first temperature sensor 21a and the first and second temperatures of the second gas tank 11b. Correction values (for example, correction value (T1b + A), correction value (T2b + A)) of the detection values T1b and T2b of the sensors 21b and 22b or correction values of the temperature detection value Ttank2 of the second gas tank 11b (for example, correction value (Ttank2 + A)) ) And the like, and whether or not an abnormality has occurred in the first temperature sensor 21a may be determined according to the comparison result.

  The ECU 24 stores in advance data of a temperature correction value A that changes in accordance with various states such as temperatures and pressures of the plurality of gas tanks 11.

  When the pressure drop amount inside the plurality of gas tanks 11 is larger than a predetermined value, such as during high load operation when the fuel cell stack 1 is started, the ECU 24 sets the temperature correction value A to the pressure change amount ΔP. The correction value f1 (ΔP) according to

As shown in FIG. 6, the correction value f1 (ΔP) is for correcting a difference in change in temperature decrease ΔT (negative value) corresponding to the pressure change amount ΔP between the plurality of gas tanks 11.
As shown in FIG. 6, as the pressure change amount (that is, the pressure decrease amount) ΔP of each gas tank 11 increases, the temperature decrease amount ΔT (negative value) changes in an increasing trend.

  The ECU 24 reduces the temperature inside the gas tank 11 when the amount of pressure drop inside the gas tank 11 from the specified time before the fuel cell stack 1 is started or during the operation of the fuel cell stack 1 is larger than a predetermined value. Judge that the trend will change. Further, for example, it is determined that the temperature decrease amount ΔT differs depending on the size and material of each gas tank 11.

The ECU 24 determines that the temperature decrease amount ΔT changes in an increasing trend as the heat insulation of the gas tank 11 increases or as the internal volume of the gas tank 11 increases.
For example, the ECU 24 sets the temperature detection value Ttank1 of the first gas tank 11a to be equal to the addition value of the temperature detection value Ttank2 of the second gas tank 11b and the correction value f1 (ΔP) (Ttank1 = Ttank2 + f1 (ΔP)).
The temperature detection value Ttank1 of the first gas tank 11a is, for example, the average value of the detection values T1a and T2a of the temperatures of the first and second temperature sensors 21a and 22a of the first gas tank 11a.

Note that the pressure change amount ΔP is the difference between the current pressure P and the pressure PA before the specified time when the fuel cell stack 1 is started or during the operation of the fuel cell stack 1 with respect to the pressure inside the gas tank 11. (ΔP = PA−P).
The temperature drop amount ΔT is the difference between the temperature TA before the specified time at the start of the fuel cell stack 1 or during the operation of the fuel cell stack 1 and the current temperature T with respect to the temperature inside the gas tank 11. (ΔT = TA−T).

  When the pressure increase amount inside the plurality of gas tanks 11 is larger than a predetermined value, such as when the reaction gas is charged, the ECU 24 sets the temperature correction value A as the pressure change amount ΔP and the elapsed time after completion of the filling. A correction value f2 (ΔP, t) corresponding to time (elapsed time after filling) t is used.

As shown in FIGS. 7A and 7B, the correction value f2 (ΔP, t) is the pressure change amount ΔP between the gas tanks 11 and the elapsed time after the completion of filling (elapsed time after filling) t. The difference in change in the temperature rise amount ΔT (positive value) corresponding to is corrected.
As shown in FIG. 7A, as the pressure change amount (that is, the pressure decrease amount) ΔP of each gas tank 11 increases, the temperature increase amount ΔT (positive value) changes in an increasing tendency.
Further, as shown in FIG. 7B, the temperature increase amount ΔT (positive value) changes in a decreasing tendency as the elapsed time t after filling of each gas tank 11 increases.

  The ECU 24 determines that the temperature inside the gas tank 11 changes to an increasing tendency when the amount of pressure increase inside the gas tank 11 after the completion of the filling of the reaction gas into the gas tank 11 is larger than a predetermined value. Further, for example, it is determined that the temperature increase amount ΔT differs depending on the size and material of each gas tank 11.

The ECU 24 determines that the temperature increase amount ΔT changes in an increasing trend as the heat insulation of the gas tank 11 increases or as the internal volume of the gas tank 11 increases.
The ECU 24 assumes that the temperature detection value Ttank1 of the first gas tank 11a is equal to the addition value of the temperature detection value Ttank2 of the second gas tank 11b and the correction value f2 (ΔP, t) (Ttank1 = Ttank2 + f1 (ΔP, t)). .

The pressure change amount ΔP is, for example, the difference between the pressure PB before the start of filling of the reaction gas into the gas tank 11 and the current pressure P with respect to the pressure inside the gas tank 11 (ΔP = PB−P).
The temperature decrease amount ΔT is, for example, the difference between the temperature TB before the start of filling of the reaction gas into the gas tank 11 and the current temperature T with respect to the temperature inside the gas tank 11 (ΔT = TB−T).

  According to the second modification, even if the first and second gas tanks 11a and 11b have different sizes or materials, the detected value of the temperature inside one gas tank 11 is set to a predetermined value. By adding the correction value A, it is possible to accurately grasp the temperature information inside the other gas tank 11.

  In the above-described embodiment, the output voltage difference (| V1−V2 |) between the first and second temperature sensors 21 and 22 at each temperature in the entire detection temperature range when the temperature detection circuit 23 is normal. May be set to be larger than the added value of the output errors of the first and second temperature sensors 21 and 22.

In this case, the ECU 24 detects the detected temperature difference between the first and second temperature sensors 21 and 22 in the entire detected temperature range of the first and second temperature sensors 21 and 22 or in a wide temperature range or an appropriate temperature range. (| T1-T2 |) is calculated. Then, the calculated detected temperature difference (| T1−T2 |) is a value obtained by adding the detected temperature error of the first and second temperature sensors 21 and 22 and a preset value when the temperature detecting circuit 23 is normal. When the detected temperature difference (| T1-T2 |) between the first and second temperature sensors 21 and 22 is larger than the value obtained by adding together, an abnormality such as an offset abnormality, gain abnormality, disconnection or short circuit occurs. It is determined that
On the other hand, the calculated detected temperature difference (| T1−T2 |) is a value between the added value of the detected temperature error and the first and second temperature sensors 21 and 22 when the preset temperature detecting circuit 23 is normal. If the detected temperature difference (| T1−T2 |) is equal to or less than the value obtained by adding the difference, it is determined that no abnormality has occurred.

  In the above-described embodiment, the electrical resistance characteristics of the first and second temperature sensors 21 and 22 are negative characteristics. However, the characteristics are not limited to this and may be positive characteristics.

  In the above-described embodiment, the setting of the resistance values RP1, RP2 of the first and second pull-up resistors 31, 32 is different from the output voltage characteristics of the first and second temperature sensors 21, 22. The output voltage difference (| V1−V2 |) of the first and second temperature sensors 21 and 22 and the first and second temperature sensors 21 and 22 in the entire detection temperature range when the temperature detection circuit 23 is normal. You may set the magnitude | size with the addition value of each output error of the 2nd temperature sensors 21 and 22. FIG.

  In the above-described embodiment, the first and second pull-up resistors 31 and 32 may be omitted.

  In the above-described embodiment, the high-pressure tank system 10 can supply the reaction gas to the fuel cell stack 1. However, the present invention is not limited to this, and may be provided in another device or system. May be arranged alone.

  The present embodiment described above shows an example in carrying out the present invention, and it goes without saying that the present invention is not construed as being limited to the above-described embodiment.

1 Fuel cell stack (gas supply system)
10 High pressure tank system 11 Gas tank (high pressure gas tank)
11a 1st gas tank (tank1) (high pressure gas tank)
11b Second gas tank (tank2) (high pressure gas tank)
21 First temperature sensor (temperature sensor)
21a First temperature sensor (tank1) (temperature sensor)
21b 1st temperature sensor (tank2) (other temperature sensors)
22 2nd temperature sensor 22a 2nd temperature sensor (tank1) (temperature sensor)
22b Second temperature sensor (tank2) (other temperature sensor)
23 temperature detection circuit 24 ECU (abnormality determination means, temperature information acquisition means)
31 First pull-up resistor 32 Second pull-up resistor 41 External temperature sensor (other temperature sensor)

Claims (5)

A high-pressure gas tank;
A plurality of temperature sensors provided in the high-pressure gas tank for detecting the temperature inside the high-pressure gas tank;
Other temperature sensors different from the plurality of temperature sensors;
Abnormality determining means for determining whether an abnormality has occurred in any of the plurality of temperature sensors;
When it is determined by the abnormality determination means that an abnormality has occurred in any one of the plurality of temperature sensors, the temperature inside the high-pressure gas tank is determined using the detection value of the other temperature sensor. Temperature information acquisition means for acquiring the information of
A high-pressure tank system comprising: When the abnormality determination unit determines that an abnormality has occurred in any of the plurality of temperature sensors, the abnormality determination unit calculates a difference between a detection value of each of the plurality of temperature sensors and a detection value of the other temperature sensor. The high-pressure tank system according to claim 1, wherein the high-pressure tank system is calculated and determined that the temperature sensor having the maximum difference is a temperature sensor having an abnormality. The high-pressure gas tank as a first high-pressure gas tank, and a second high-pressure gas tank connected in parallel to the first high-pressure gas tank with respect to a gas supply system;
3. The high-pressure tank system according to claim 1, wherein the other temperature sensor is provided in the second high-pressure gas tank and detects a temperature inside the second high-pressure gas tank. 4. The first high pressure gas tank and the second high pressure gas tank have different sizes or materials,
The said temperature information acquisition means acquires the information of the temperature inside the said 1st high pressure gas tank by adding a predetermined | prescribed correction value to the detected value of the said other temperature sensor, The Claim 3 characterized by the above-mentioned. High pressure tank system. 3. The high-pressure tank system according to claim 1, wherein the other temperature sensor is disposed outside the high-pressure gas tank and in the vicinity of the high-pressure gas tank, and detects a temperature outside the high-pressure gas tank. .

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