JP2012122930A - Abnormality determination method for temperature sensors and on-vehicle charger for determining abnormality using the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality determination method for determining abnormalities of temperature sensors at an early stage.SOLUTION: An abnormality determination method for determining abnormalities of a plurality of temperature sensors which are provided at respective temperature detection targets and detect temperature for each temperature detection target comprises: a temperature data acquisition step (S1, S7, and S13) for acquiring temperature data detected by each of the respective temperature sensors; a temperature order calculation step (S3, S9, and S15) for calculating the order of the temperature data of the respective temperature sensors; and an abnormality determination step (S4, S10, and S16) for determining whether or not there are any abnormalities in the temperature sensors, by comparing the temperature order of the temperature data calculated in the temperature order calculation step and the temperature order set in advance based on temperatures expected to be detected by the respective temperature sensors.

Description

  The present invention relates to an abnormality determination method for determining an abnormality of a temperature sensor provided in a temperature detection target, and an in-vehicle charger for determining an abnormality using the method.

  In general, an in-vehicle charger that charges a battery mounted on an electric vehicle such as an electric vehicle has a plurality of modules that generate an output voltage supplied to the battery and temperatures of temperature detection targets (for example, elements constituting the module). And a plurality of temperature sensors for detecting whether or not the temperature of the temperature detection target is normal.

  In the above-mentioned on-vehicle charger, if an abnormality occurs in the temperature sensor itself, even if the temperature of the temperature detection target rises excessively, this temperature increase cannot be detected, and the temperature detection target may be deteriorated by heat. There is. For this reason, in the on-vehicle charger, it is necessary to determine early whether or not an abnormality has occurred in the temperature sensor itself, and to repair or replace the temperature sensor determined to be abnormal.

As an abnormality determination method for determining an abnormality of a temperature sensor, conventionally, the temperature detected by the temperature sensor deviates from a preset temperature change range (a temperature range sandwiched between the upper limit temperature profile and the lower limit temperature profile), and A method for determining that a temperature sensor is abnormal when the time change rate of the temperature detected by the temperature sensor exceeds a preset threshold is known (see, for example, Patent Document 1).
In addition, since the temperature of the temperature detection target in the in-vehicle charger varies greatly depending on the external environment and the state of charge, the temperature change range is set to be relatively large.

JP 2004-325110 A

  By the way, the abnormality of the temperature sensor is roughly classified into three modes of “disconnection mode”, “short circuit mode”, and “invariant mode”. Among these modes, the “disconnected mode” indicates that the temperature detected by the temperature sensor becomes unstable and exhibits extremely high or low values, and in the “short circuit mode”, the temperature detected by the temperature sensor rapidly increases. Rise or fall. On the other hand, in the “invariant mode”, the temperature detected by the temperature sensor does not change with a constant value.

  For this reason, in the above-described conventional abnormality determination method, the temperature sensor in which the abnormality in the “disconnection mode” and the “short circuit mode” has occurred immediately deviates from the preset temperature change range. Although it is determined to be abnormal at an early stage, the temperature sensor in which the “invariant mode” abnormality has occurred takes time until it is determined to be abnormal.

FIG. 9 is a diagram illustrating the time taken for the temperature sensor TH1 ′ in which the “invariant mode” abnormality has occurred during charging to be determined to be abnormal in the conventional abnormality determination method. In the figure, the time t ₁ is the time when the abnormality of the “invariant mode” has occurred in the temperature sensor TH 1 ′, and the time t ₂ is the temperature detected by the temperature sensor TH 1 ′ from a preset temperature change range. It is the time of departure.

As shown in the figure, in the conventional abnormality determination method, 'even if error in "invariant mode" to occur, during time t ₁ ~t ₂ temperature sensor TH1' temperature sensor TH1 at time t ₁ detected by since falls within a temperature variation range where the temperature is preset that is, can not be determined that an abnormality of the temperature sensor TH1 'until after time t _2.
As a result, in the above conventional abnormality determination method, even if the temperature of the temperature detection target rises excessively for some reason between times t _{1 and} t ₂ , this excessive temperature rise cannot be detected. There was a possibility that the subject might deteriorate due to heat.

  The present invention has been made in view of the above circumstances, and the problem is that an abnormality determination method capable of determining an abnormality of a temperature sensor at an early stage and an in-vehicle charger for determining abnormality using the method Is to provide.

In order to solve the above-described problem, a temperature sensor abnormality determination method according to the present invention is provided for each of a plurality of temperature detection objects, and abnormality determination for determining an abnormality of a plurality of temperature sensors for detecting temperatures for each temperature detection object. A method,
A temperature data acquisition step of acquiring temperature data detected by each of the plurality of temperature sensors;
A height relationship calculating step for calculating a height relationship of temperature data between a plurality of temperature sensors;
By comparing the elevation relationship of the temperature data calculated in the elevation relationship calculation step with the elevation relationship of the temperature data set in advance based on the temperature to be detected by the plurality of temperature sensors, the plurality of temperature sensors are abnormal. An abnormality determination step for determining whether or not
A series of steps of a temperature data acquisition step, an elevation relationship calculation step, and an abnormality determination step are repeatedly executed.

According to this configuration, the level relationship of the temperature data calculated in the level relationship calculation step is compared with the level relationship of the preset temperature data to determine whether or not the plurality of temperature sensors are abnormal. Since it has an abnormality determination step,
Even if the temperature data acquired from the temperature sensor in which the abnormality in the “invariant mode” has occurred is not out of the preset temperature change range, the elevation relationship of the temperature data calculated in the elevation relationship calculation step is preset. If the temperature data is different from the elevation relationship, the temperature sensor in which the “invariant mode” abnormality has occurred can be determined to be abnormal.

  Further, the abnormality determination step acquires the temperature data when the level relationship of the calculated temperature data and the level relationship of the preset temperature data are continuously different a predetermined number of times in the comparison. The temperature sensor may be determined to be abnormal.

  According to this configuration, when the height relationship calculated based on the temperature data affected by temporarily generated noise or the like is different from the height relationship of the preset temperature data, the temperature data is acquired. It can be avoided that the temperature sensor is determined to be abnormal.

In addition, the plurality of temperature sensors includes a temperature sensor in which the level relationship of temperature data preset with other temperature sensors is obvious, and an unknown temperature sensor,
The abnormality determination step skips the comparison between the temperature sensors in which the level relationship of the preset temperature data is unknown, and executes the comparison between the temperature sensors in which the level relationship of the preset temperature data is clear It may be determined whether or not a plurality of temperature sensors are abnormal.

  According to this configuration, since the abnormality determination step skips the comparison between the temperature sensors for which the preset temperature data level relationship is unknown, a place where the level relationship to be detected cannot be determined. Even if it is the temperature sensor provided in, it can determine the presence or absence of abnormality.

Further, when the abnormality determination step of the plurality of temperature sensors based on the comparison is the first abnormality determination step,
Comparing the temperature data with the temperature change range set based on the temperature profile that assumes the time change of the temperature data, if the temperature data is out of the temperature change range, the temperature sensor that acquired the temperature data It is preferable to further include a second abnormality determination step for determining an abnormality.

  According to this configuration, when the acquired temperature data deviates from the temperature change range that assumes the time change of the temperature data, the second abnormality determination step does not determine that there is an abnormality in the first abnormality determination step. Since the temperature sensor that has acquired the temperature data can be determined to be abnormal, the abnormality of the temperature sensor can be determined earlier.

  Further, in the abnormality determination method, the plurality of temperature detection targets include an element having the highest temperature among a plurality of elements constituting the module and an atmospheric temperature in a housing that houses at least one module. Also good.

Moreover, in order to solve the said subject, the vehicle-mounted charger which concerns on this invention produces | generates DC output voltage based on AC input voltage, and charges the battery mounted in the electric vehicle using this output voltage. An in-vehicle charger,
A PFC module that generates a DC voltage by improving the power factor of the input voltage, an inverter module that generates an output voltage supplied to a battery by stepping up or down the DC voltage, and a control module that controls the PFC module and the inverter module And two or more temperature sensors respectively disposed in two or more of the housing that houses the PFC module, the inverter module, and the control module, the element that constitutes the PFC module, the element that constitutes the inverter module, and the housing With
The control module includes a temperature data acquisition unit that acquires temperature data detected by each of the temperature sensors, a level relationship calculation unit that calculates a level relationship of temperature data between the temperature sensors, and a temperature calculated by the level relationship calculation unit. Abnormal determination that determines whether or not the temperature sensor is abnormal by comparing the level relationship of the data with the level relationship of the temperature data set in advance based on the level relationship of the temperature to be detected by the temperature sensor And an output stop unit that controls the PFC module and the inverter module to stop the supply of the output voltage when it is determined that the temperature sensor is abnormal.

According to this configuration, the abnormality that determines whether or not the temperature sensor is abnormal by comparing the elevation relationship of the temperature data calculated by the elevation relationship calculation unit with a preset elevation relationship of the temperature data. Because it has a judgment part
Even if the temperature data acquired from the temperature sensor in which the abnormality in the “invariant mode” has occurred is not out of the preset temperature change range, the elevation relationship of the temperature data calculated by the elevation relationship calculation unit is preset. If the temperature data is different from the elevation relationship, the temperature sensor in which the “invariant mode” abnormality has occurred can be determined to be abnormal.

When the control module in the on-vehicle charger uses the abnormality determination unit that determines abnormality of the temperature sensor based on the comparison as the first abnormality determination unit,
Comparing the temperature data with the temperature change range set based on the temperature profile that assumes the time change of the temperature data, if the temperature data is out of the temperature change range, the temperature sensor that acquired the temperature data It is preferable to further include a second abnormality determination unit that determines abnormality.

  According to this configuration, when the acquired temperature data is out of the temperature change range set in advance, the temperature data is acquired by the second abnormality determination unit even if the first abnormality determination unit does not determine that there is an abnormality. Since the temperature sensor can be determined to be abnormal, the temperature sensor abnormality can be determined earlier.

  According to the present invention, it is possible to provide an abnormality determination method capable of determining an abnormality in the “invariant mode” of the temperature sensor at an early stage, and an abnormality determination unit for early determining an abnormality in the “invariant mode” of the temperature sensor It is possible to provide an in-vehicle charger.

It is a block diagram of the vehicle-mounted charger which concerns on 1st Embodiment of this invention. It is a figure which shows the temperature profile of the temperature sensor in 1st Embodiment of this invention. In 1st Embodiment of this invention, it is a figure which shows the time taken until it determines with a temperature sensor being abnormal. It is a flowchart of the abnormality determination method which concerns on 1st Embodiment of this invention. It is a flowchart of the 2nd abnormality determination step in this invention. It is a flowchart of the abnormality determination method which concerns on 2nd Embodiment of this invention. It is a block diagram of the vehicle-mounted charger which concerns on 3rd Embodiment of this invention. It is a flowchart of the abnormality determination method which concerns on 3rd Embodiment of this invention. In the conventional abnormality determination method, it is a figure which shows the time taken until a temperature sensor is determined to be abnormal.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
First, the configuration of the in-vehicle charger 1 according to the first embodiment of the present invention will be described.

  As shown in FIG. 1, the in-vehicle charger 1 generates a DC output voltage based on an AC input voltage supplied from a 100V / 200V commercial AC power supply (not shown), and uses the output voltage. A battery 2 mounted on an electric vehicle is charged, and a PFC module 3, an inverter module 4, a control module 5, and a housing 6 that accommodates the PFC module 3, the inverter module 4, and the control module 5 therein. It has.

  The AC input voltage supplied from the commercial AC power supply is improved in power factor by the PFC module 3, rectified to a DC voltage, and supplied to the inverter module 4. The DC voltage supplied to the inverter module 4 is boosted or stepped down and then supplied to the battery 2 as a DC output voltage.

  The PFC module 3 includes a diode bridge circuit that rectifies an AC input voltage supplied from a commercial AC power source into a DC voltage, a power factor correction circuit that improves the power factor of the input voltage, and a DC voltage rectified by the diode bridge circuit. And a booster circuit for boosting the voltage. A thermistor (first temperature sensor) TH1 for detecting the temperature of the switch element is provided in the vicinity of the switch element included in the booster circuit.

The inverter module 4 includes a full bridge circuit that converts the DC voltage supplied from the PFC module 3 into an AC voltage, a transformer that boosts or steps down the AC voltage converted by the full bridge circuit, and an AC that is boosted or lowered by the transformer. A diode bridge circuit for rectifying the voltage.
A thermistor (second temperature sensor) TH2 for detecting the temperature of the switch element is provided in the vicinity of the switch element included in the full bridge circuit.

  Inside the housing 6 that houses the PFC module 3 and the inverter module 4, at a place away from the PFC module 3 and the inverter module 4 (for example, the left corner in the housing 6 in FIG. 1), the internal temperature (atmosphere temperature) of the housing 6. A thermistor (third temperature sensor) TH3 is provided.

  The control module 5 controls the PFC module 3 and the inverter module 4 to start / stop supply of the output voltage to the battery 2, and includes a temperature data acquisition unit 51, a height relationship calculation unit 52, and a storage unit 53. A first abnormality determination unit 54, a second abnormality determination unit 55, and an output stop unit 56.

  The temperature data acquisition unit 51 repeatedly acquires the temperature data T (TH1), T (TH2), and T (TH3) detected by the thermistors TH1 to TH3 at a predetermined cycle. The obtained temperature data of the thermistors TH1 to TH3 is stored in the storage unit 53 made of RAM, EEPROM or the like.

The elevation relationship calculation unit 52 calculates the elevation relationship of the temperature data of the thermistors TH1 to TH3 acquired by the temperature data acquisition unit 51.
The level relationship of the temperature data between the thermistors TH1 to TH3 may be calculated based on the level relationship of each one temperature data, or may be calculated based on the level relationship of a plurality of temperature data average values. .

  The first abnormality determination unit 54 has a temperature data height relationship calculated by the height relationship calculating unit 52 and a temperature data level relationship set in advance based on the temperature data to be detected by the thermistors TH1 to TH3. Is compared to determine whether or not the thermistors TH1 to TH3 are abnormal.

The temperature change (temperature profile) to be detected by the thermistors TH1 to TH3 should be predicted based on the specifications of the in-vehicle charger 1, the specifications of the PFC module 3 and the inverter module 4, the characteristics of the switch element (temperature detection target), and the like. Can do.
In the present embodiment, the level relationship of the temperatures to be detected by the thermistors TH1 to TH3 is as shown in FIG. 2, and the level relationship of the temperature data determined based on this level relationship is T (TH1) <T (TH2) <T (TH3).
The data relating to the elevation relationship (T (TH1) <T (TH2) <T (TH3)) of the temperature data set in advance based on the elevation relationship of the temperatures to be detected by the thermistors TH1 to TH3 is stored in the storage unit 53 in advance. Stored.

The first abnormality determination unit 54 compares the temperature data stored in the storage unit 53 in advance (T (TH1) <T (TH2) <T (TH3)) and the temperature data calculated by the height relationship calculation unit 52. Compared with the elevation relationship, if the elevation relationship of the calculated temperature data is T (TH1) <T (TH2) <T (TH3), all thermistors TH1 to TH3 are determined to be normal and calculated. If the relationship of the temperature data is not T (TH1) <T (TH2) <T (TH3), it is determined that there is an abnormality.
For example, if the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52 is T (TH2) <T (TH1) <T (TH3), the relationship between the thermistor TH1 and the thermistor TH3 is the same. Because the relationship between the thermistor TH1 and the thermistor TH2 is different, the first abnormality determination unit 54 determines that the thermistor TH1 and the thermistor TH2 are abnormal.

  When the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52 is T (TH2) <T (TH1) <T (TH3), there is an abnormality in either the thermistor TH1 or the thermistor TH2. The first abnormality determination unit 54 can determine that the thermistor having the larger difference between the actually detected temperature and the temperature to be detected (the temperature profile in FIG. 2) is abnormal because it is considered that it has occurred. preferable.

In addition, the first abnormality determination unit 54 includes the elevation relationship between the temperature data calculated by the elevation relationship calculation unit 52 and the preset elevation relationship (T (TH1) <T (TH2) <T (TH3)). Are different for a predetermined number of times, a thermistor showing a different result is determined to be abnormal.
For this reason, the first abnormality determination unit 54 acquires the temperature data that is affected by noise or the like that is temporarily generated by the temperature data acquisition unit 51, so that the level of the temperature data calculated by the level relationship calculation unit 52 is high or low. Even if the relationship is different from the preset temperature data level relationship (T (TH1) <T (TH2) <T (TH3)), the thermistor from which the temperature data is acquired is determined to be normal. can do.

  The second abnormality determination unit 55 includes a predetermined temperature range in the temperature data of the thermistors TH1 to TH3 acquired by the temperature data acquisition unit 51 and the temperature profiles (see FIG. 2) of the thermistors TH1 to TH3 assuming temporal changes in the temperature data. Is compared with the temperature change range of the thermistors TH1 to TH3 (see FIG. 3) to determine whether the thermistors TH1 to TH3 are abnormal.

  Specifically, when the temperature data acquired by the temperature data acquisition unit 51 is out of a preset temperature change range, the second abnormality determination unit 55 determines that the thermistor from which the temperature data is acquired is abnormal. If the temperature data acquired by the temperature data acquisition unit 51 falls within the preset temperature change range, the thermistor from which the temperature data is acquired is determined to be normal.

  When the first abnormality determination unit 54 or the second abnormality determination unit 55 determines that at least one of the thermistors TH1 to TH3 is abnormal, the output stop unit 56 controls the PFC module 3 and the inverter module 4 to control the battery 2 The supply of output voltage to is stopped.

FIG. 3 is a diagram showing the time taken from the occurrence of the “invariant mode” abnormality to the thermistor TH2 during charging until it is determined that the thermistor TH2 is abnormal.
In the figure, time t ₁ is the time when the “invariant mode” abnormality occurs in the thermistor TH2, and time t ₂ is the time when the temperature data of the thermistor TH2 becomes equal to the temperature data of the thermistor TH1, t ₃ is the time when the first abnormality determination unit 54 determines that the thermistor TH2 is abnormal, and time t ₄ is the time when the second abnormality determination unit 55 determines that the thermistor TH2 is abnormal.

As shown in FIG. 3, when an abnormality of the generated "invariant mode" to the thermistor TH2 at the time t _1, the temperature detected by the thermistor TH2 is not change remain constant value. On the other hand, the temperature detected by the thermistor TH1 rises according to the temperature profile as time passes.

During the time t ₁ <t <t ₂ , the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52 is T (TH1) <T (TH2). Then, the height relationship (T (TH1) <T (TH2)) of the temperature data calculated by the height relationship calculation unit 52 and the preset height relationship (T (TH1) <T (TH2)) of the temperature data. Since the comparison results in a match, the first abnormality determination unit 54 determines that the thermistor TH2 is normal.
In addition, during the time t ₁ <t <t ₂ , the temperature data of the thermistor TH2 is within the preset temperature change range of the thermistor TH2, so that the second abnormality determination unit 55 also determines that the thermistor TH2 is normal. .

During the time t ₂ ≦ t <t ₃ , the temperature data of the thermistor TH2 is equal to or lower than the temperature data of the thermistor TH1, so the height relationship of the temperature data calculated by the height relationship calculation unit 52 is also T (TH1) ≧ T (TH2 ).
Then, the height relationship (T (TH1) ≧ T (TH2)) of the temperature data calculated by the height relationship calculation unit 52 and the preset height relationship (T (TH1) <T (TH2)) of the temperature data. Since the comparison results in different results, the first abnormality determination unit 54 attempts to determine the thermistor TH2 as abnormal. However, during the time t ₂ ≦ t <t ₃ , the different results have not reached the predetermined number of times (for example, 10 times), so the first abnormality determination unit 54 determines that the thermistor TH2 is normal. That is, during the time t ₂ ≦ t <t ₃ , the number of executions of repeatedly executing the series of steps of the temperature data acquisition step, the height relationship calculation step, and the abnormality determination step is less than the preset number of times. Even if (TH1) ≧ T (TH2), the first abnormality determination unit 54 does not determine that there is an abnormality.

When the different result reaches a predetermined number of times at time t ₃ , the first abnormality determination unit 54 determines that the thermistor TH 2 is abnormal.
At time t ₃ , since the temperature data of the thermistor TH2 is within the temperature change range of the thermistor TH2, the second abnormality determination unit 55 determines that the thermistor TH2 is normal.

At time t _4, it determines the temperature data of the thermistor TH2 is deviates from the temperature variation range of the thermistor TH2, the second abnormality determination unit 55 also abnormal thermistor TH2.

As described above, in the in-vehicle charger 1 according to the present embodiment, the thermistors TH1 to TH1 are compared by comparing the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52 with the preset elevation relationship of the temperature data. Since the first abnormality determination unit 54 that determines whether TH3 is abnormal or not, the temperature data acquired from the thermistor in which the abnormality in the “invariant mode” has occurred is out of the preset temperature change range. Even if not (even if the second abnormality determination unit 55 determines that the thermistor is normal), the level relationship of the temperature data calculated by the level relationship calculation unit 52 is different from the level relationship of the preset temperature data. Then, the first abnormality determination unit 54 determines that the temperature sensor in which the “invariant mode” abnormality has occurred is abnormal.
For this reason, according to the vehicle-mounted charger 1 which concerns on this embodiment, abnormality of the "invariant mode" of the thermistors TH1-TH3 can be determined at an early stage.

  Further, in the in-vehicle charger 1 according to the present embodiment, when the temperature data acquired from the thermistor in which the “disconnection mode” or “short-circuit mode” abnormality occurs falls outside the preset temperature change range, the first abnormality determination Even if the unit 54 does not determine that the thermistor from which the temperature data is acquired is abnormal, the second abnormality determination unit 55 determines that it is abnormal. Therefore, not only the “invariant mode” abnormality but also the “disconnection mode” and Abnormalities in the “short circuit mode” can also be determined early.

  Furthermore, in the on-vehicle charger 1 according to the present embodiment, the software (first abnormality) in the control module 5 is not installed without newly installing hardware such as an abnormality determination circuit for determining abnormality of the thermistors TH1 to TH3. An abnormality of the thermistors TH1 to TH3 can be determined by the determination unit 54, the second abnormality determination unit 55, and the like. That is, in the in-vehicle charger 1 according to the present embodiment, it is possible to determine the abnormality of the thermistors TH1 to TH3 at an early stage at low cost.

  Next, an abnormality determination method according to the first embodiment of the present invention will be described with reference to FIGS.

In the abnormality determination method according to the present embodiment, an abnormality detection program is executed in the control module 5 when charging is started. In the abnormality determination method according to the present embodiment, the temperature data acquisition unit 51 acquires the temperature data of the thermistors TH1 to TH3 at intervals of 2 ms.
When the abnormality detection program is executed, as shown in FIG. 4, first, the temperature data acquisition unit 51 acquires the temperature data of the thermistors TH1 to TH3 (S0).
Subsequently, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH1 (temperature data acquisition step) (S1), and the second abnormality determination unit 55 calculates the temperature data of the thermistor TH1 and the temperature change range of the thermistor TH1. In comparison, it is determined whether or not the thermistor TH1 is abnormal (second abnormality determination step) (S2).

  The second abnormality determination step includes the steps shown in FIG. As shown in the figure, the second abnormality determination unit 55 reads the temperature change range of the thermistor TH1 stored in the storage unit 53 in advance (S2-1), and obtains the temperature change range and temperature data of the read thermistor TH1. The temperature data of the thermistor TH1 acquired by the unit 51 is compared (S2-2).

  As a result of the comparison, when the temperature data of the thermistor TH1 is out of the temperature change range of the thermistor TH1 (No in S2-2), the second abnormality determination unit 55 determines that the thermistor TH1 is abnormal (S2-3).

  When the thermistor TH1 is determined to be abnormal by the second abnormality determination unit 55, the output stop unit 56 performs an abnormality handling process such as controlling the PFC module 3 and the inverter module 4 to stop supplying the output voltage ( S2-4). When the abnormality handling process by the output stop unit 56 is executed, the abnormality detection program ends.

  On the other hand, as a result of the comparison, when the temperature data of the thermistor TH1 is within the temperature change range of the thermistor TH1 (Yes in S2-2), the second abnormality determination unit 55 determines that the thermistor TH1 is normal.

  When the thermistor TH1 is determined to be normal by the second abnormality determination unit 55, the elevation relationship calculation unit 52 has been acquired by the temperature data acquisition unit 51 and the temperature data of the thermistor TH1 acquired by the temperature data acquisition unit 51. A height relationship with the temperature data of the thermistors TH2 and TH3 is calculated (step for calculating height relationship) (S3).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH3 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 determines the elevation relationship between the temperature data calculated by the elevation relationship calculation unit 52 and the thermistors TH1 to TH1. Preset temperature data (T (TH1) <T (TH2) and T (TH1) <T (TH3)) based on the level relationship of the temperature to be detected by TH3 (temperature profile in FIG. 2) To determine whether the thermistor TH1 is abnormal (first abnormality determination step) (S4).

  As a result of the comparison, the elevation relationship between the temperature data calculated by the elevation relationship calculation unit 52 and the elevation relationship between the preset temperature data (T (TH1) <T (TH2) and T (TH1) <T (TH3)) Are different (No in S4), the first abnormality determination unit 54 determines that the thermistor TH1 is abnormal (S5). When the abnormality determination is made in the first abnormality determination unit 54, the abnormality handling process by the output stop unit 56 is executed (S6), and the abnormality detection program is terminated.

  On the other hand, as a result of the comparison, the elevation relationship between the temperature data calculated by the elevation relationship calculation unit 52 and the elevation relationship between the preset temperature data (T (TH1) <T (TH2) and T (TH1) <T (TH3 )) Matches (Yes in S4), the first abnormality determination unit 54 determines that the thermistor TH1 is normal.

  When the first abnormality determination unit 54 determines that the thermistor TH1 is normal, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH2 (S7), and the second abnormality determination unit 55 performs the steps shown in FIG. As described above, the temperature data of the thermistor TH2 acquired by the temperature data acquisition unit 51 is compared with the temperature change range of the thermistor TH2 stored in the storage unit 53 in advance to determine whether or not the thermistor TH2 is abnormal. (Second abnormality determination step) (S8).

  When the thermistor TH2 is determined to be normal by the second abnormality determination unit 55, the elevation relationship calculation unit 52 is acquired by the temperature data acquisition unit 51 and the temperature data of the thermistors TH1 and TH2 acquired by the temperature data acquisition unit 51. The height relationship with the temperature data of the thermistor TH3 that has been stored is calculated (S9).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH3 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 is preset with the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52. It is determined whether or not the thermistor TH2 is abnormal by comparing the temperature data (T (TH2)> T (TH1) and T (TH2) <T (TH3)). Step) (S10).

  As a result of the comparison, if the temperature data is different in level (No in S10), the first abnormality determination unit 54 determines that the thermistor TH2 is abnormal (S11). Thereafter, an abnormality handling process by the output stop unit 56 is executed (S12), and the abnormality detection program is terminated.

  On the other hand, as a result of the comparison, when the temperature data are in the same height relationship (Yes in S10), the first abnormality determination unit 54 determines the thermistor TH2 as normal.

  When the first abnormality determination unit 54 determines that the thermistor TH2 is normal, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH3 (S13), and the second abnormality determination unit 55 receives the temperature data acquisition unit 51. The obtained temperature data of the thermistor TH3 and the temperature change range of the thermistor TH3 stored in advance in the storage unit 53 are compared to determine whether or not the thermistor TH3 is abnormal (second abnormality determination step). (S14).

  When the thermistor TH3 is determined to be normal by the second abnormality determination unit 55, the elevation relationship calculation unit 52 calculates the elevation relationship of the temperature data of the thermistors TH1 to TH3 acquired by the temperature data acquisition unit 51 (S15).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH3 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 is preset with the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52. And the temperature data (T (TH3)> T (TH1) and T (TH3)> T (TH2)) are compared to determine whether the thermistor TH3 is abnormal (first abnormality determination) Step) (S16).

  As a result of the comparison, if the temperature data are different in level (No in S16), the first abnormality determination unit 54 determines that the thermistor TH3 is abnormal (S17). Thereafter, an abnormality handling process by the output stop unit 56 is executed (S18), and the abnormality detection program is terminated.

  On the other hand, as a result of the comparison, if the temperature data match (Yes in S16), the first abnormality determination unit 54 determines that the thermistor TH3 is normal.

  When the first abnormality determination unit 54 determines that the thermistor TH3 is normal, the temperature data acquisition unit 51 acquires temperature data of the thermistor TH1 again (S1). In the abnormality determination method according to the present embodiment, the abnormality detection program is continued until the abnormality handling process by the output stop unit 56 is executed or until charging is completed.

[Second Embodiment]
Next, an abnormality determination method according to the second embodiment of the present invention will be described.

  In the abnormality determination method according to the first embodiment, first, after the temperature data of the thermistors TH1 to TH3 is acquired (S0), the first abnormality determination step and the second abnormality determination step are executed on the thermistor TH1. The first abnormality determination step and the second abnormality determination step are sequentially performed on the thermistors TH2 and TH3. However, in the abnormality determination method according to the present embodiment, the second abnormality determination step is performed on all thermistors TH1 to TH3. Is executed, the first abnormality determination step is executed for all the thermistors TH1 to TH3.

  Specifically, as shown in FIG. 6, when the abnormality detection program is executed, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH1 (temperature data acquisition step) (S19), and the second abnormality determination unit. 55 compares the temperature data of the thermistor TH1 with the temperature change range of the thermistor TH1 stored in advance in the storage unit 53 to determine whether or not the thermistor TH1 is abnormal (second abnormality determination step). (S20).

  When the second abnormality determination unit 55 determines that the thermistor TH1 is normal, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH2 (S21), and the second abnormality determination unit 55 acquires the temperature data of the thermistor TH2, and The temperature change range of the thermistor TH2 is compared to determine whether or not the thermistor TH2 is abnormal (second abnormality determination step) (S22).

  Similarly, when the thermistor TH2 is determined to be normal by the second abnormality determination unit 55, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH3 (S23), and the second abnormality determination unit 55 determines the temperature of the thermistor TH3. The data is compared with the temperature change range of the thermistor TH3 to determine whether or not the thermistor TH3 is abnormal (second abnormality determination step) (S24).

  When the thermistor TH3 is determined to be normal by the second abnormality determination unit 55, the elevation relationship calculation unit 52 calculates the elevation relationship of the temperature data of the thermistors TH1 to TH3 acquired by the temperature data acquisition unit 51 (elevation relationship calculation). Step) (S25).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH3 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 is preset with the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52. It is determined whether or not the thermistors TH1 to TH3 are abnormal by comparing the temperature data (T (TH1) <T (TH2) and T (TH2) <T (TH3)). Abnormality determination step) (S26).

  As a result of the comparison, if the temperature data are different in level (No in S26), the first abnormality determination unit 54 should detect the temperature (temperature profile in FIG. 2) among the thermistors that showed different results. The thermistor with the larger difference is determined as abnormal (S27). That is, if the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52 is T (TH1)> T (TH2) and T (TH2) <T (TH3), the first abnormality determination unit 54 Of the TH1 and TH2, the thermistor having the larger difference from the temperature to be detected is determined to be abnormal.

  If the first abnormality determination unit 54 determines that the thermistor is abnormal, an abnormality handling process is executed by the output stop unit 56 (S28), and the abnormality detection program ends.

  On the other hand, as a result of the comparison, if the temperature data match (Yes in S26), the first abnormality determination unit 54 determines that the thermistors TH1 to TH3 are normal.

  When the first abnormality determination unit 54 determines that the thermistors TH1 to TH3 are normal, the temperature data acquisition unit 51 acquires temperature data of the thermistor TH1 again (S19). In the abnormality determination method according to the present embodiment, the abnormality detection program (a series of steps of the temperature data acquisition step, the elevation relationship calculation step, and the abnormality determination step) is executed until the abnormality handling process by the output stop unit 56 is executed, or It continues repeatedly until charging is completed.

[Third Embodiment]
Next, an abnormality determination method according to the third embodiment of the present invention will be described.

  The abnormality determination method according to the present embodiment is a method of determining abnormality of the thermistors TH1 to TH4 provided in the in-vehicle charger 10 as shown in FIG. The in-vehicle charger 10 has the in-vehicle charging according to the first embodiment except that the thermistor TH4 is provided in the inverter module 4 and that the control module 50 does not have the second abnormality determination unit 55. Common to vessel 1. In the abnormality determination method according to the present embodiment, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH4 at a cycle of 2 ms.

  In the present embodiment, the level relationship between the temperature that should be detected by the thermistor TH2 and the temperature that should be detected by the thermistor TH4 changes depending on the external environment and the change in the charging status. Can not. That is, the temperature data of the thermistors TH1 to TH4 is expressed as T (TH1) <((T (TH2) <T (TH4)) or (T (TH2)> T (TH4))) <T (TH3). Become.

  For this reason, the temperature data level relationship between the thermistors TH2 and TH4 is stored in the storage unit 53 as “unknown” among the temperature data level relationships of the thermistors TH1 to TH4 determined in advance based on the temperature level relationship. ing.

FIG. 8 is a flowchart of the abnormality determination method according to the present embodiment. As shown in FIG. 4, when the abnormality detection program is executed, as shown in FIG. 4, first, the temperature data acquisition unit 51 acquires temperature data of the thermistors TH1 to TH4 (S0).
Subsequently, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH1 (temperature data acquisition step) (S29), and the elevation relationship calculation unit 52 includes the temperature data of the thermistor TH1 acquired by the temperature data acquisition unit 51, and A level relationship with the temperature data of the thermistors TH2 to TH4 acquired by the temperature data acquisition unit 51 is calculated (level relationship calculation step) (S30).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH4 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 is preset with the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52. Comparison of temperature data (T (TH1) <T (TH2), T (TH1) <T (TH3) and T (TH1) <T (TH4)) It is determined (first abnormality determination step) (S31).

  As a result of the comparison, if the level relationship of the temperature data is different (No in S31), the first abnormality determination unit 54 determines that the thermistor TH1 is abnormal (S32). When the first abnormality determination unit 54 determines that the thermistor TH1 is abnormal, an abnormality handling process is executed by the output stop unit 56 (S33), and the abnormality detection program ends.

  On the other hand, as a result of the comparison, if the temperature data match (Yes in S31), the first abnormality determination unit 54 determines that the thermistor TH1 is normal.

  When the first abnormality determination unit 54 determines that the thermistor TH1 is normal, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH2 (S34), and the elevation relationship calculation unit 52 is acquired by the temperature data acquisition unit 51. The elevation relationship between the temperature data of the thermistors TH1 and TH2 and the temperature data of the thermistors TH3 and TH4 acquired by the temperature data acquisition unit 51 is calculated (S35).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH4 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 determines the temperature between the thermistors TH2 and TH4 for which the elevation relationship of the temperature data is “unknown”. The comparison of the temperature relationship between the thermistors TH2 and TH1 and between the thermistors TH2 and TH3 (T (TH2)> T (TH1) and T (TH2) is skipped. ) <T (TH3)) to determine whether the thermistor TH2 is abnormal (first abnormality determination step) (S36).

  As a result of the comparison, if the temperature data is different in level (No in S36), the first abnormality determination unit 54 determines that the thermistor TH2 is abnormal (S37). When the first abnormality determination unit 54 determines that the thermistor TH2 is abnormal, an abnormality handling process is performed by the output stop unit 56 (S38), and the abnormality detection program ends.

  On the other hand, as a result of the comparison, if the temperature data match (Yes in S36), the first abnormality determination unit 54 determines that the thermistor TH2 is normal.

  When the first abnormality determination unit 54 determines that the thermistor TH2 is normal, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH3 (S39), and the elevation relationship calculation unit 52 is acquired by the temperature data acquisition unit 51. Then, the elevation relationship between the temperature data of the thermistors TH1 to TH3 and the temperature data of the thermistor TH4 acquired by the temperature data acquisition unit 51 is calculated (S40).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH4 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 is preset with the elevation relationship of the temperature data calculated by the elevation relationship calculation unit 52. Thermistor TH3 is abnormal by comparing the temperature data (T (TH3)> T (TH1), T (TH3)> T (TH2) and T (TH3)> T (TH4)) (First abnormality determination step) (S41).

  As a result of the comparison, if the temperature data are different in level (No in S41), the first abnormality determination unit 54 determines that the thermistor TH3 is abnormal (S42). If the first abnormality determination unit 54 determines that the thermistor TH3 is abnormal, an abnormality handling process is executed by the output stop unit 56 (S43), and the abnormality detection program ends.

  On the other hand, as a result of the comparison, if the temperature data match (Yes in S41), the first abnormality determination unit 54 determines that the thermistor TH3 is normal.

  When the first abnormality determination unit 54 determines that the thermistor TH3 is normal, the temperature data acquisition unit 51 acquires the temperature data of the thermistor TH4 (S44), and the elevation relationship calculation unit 52 is acquired by the temperature data acquisition unit 51. Then, the height relationship of the temperature data of the thermistors TH1 to TH4 is calculated (S45).

  When the elevation relationship of the temperature data between the thermistors TH1 to TH4 is calculated by the elevation relationship calculation unit 52, the first abnormality determination unit 54 determines the temperature between the thermistors TH4 and TH2 for which the elevation relationship of the temperature data is “unknown”. The comparison of the temperature relationship between the thermistors TH4 and TH1 and between the thermistors TH4 and TH3 is skipped, and the temperature data between the thermistors TH4 and TH3 (T (TH4)> T (TH1) and T (TH4) ) <T (TH3)) to determine whether or not the thermistor TH4 is abnormal (first abnormality determining step) (S46).

  As a result of the comparison, if the temperature data are different in level (No in S46), the first abnormality determination unit 54 determines that the thermistor TH4 is abnormal (S47). When the first abnormality determination unit 54 determines that the thermistor TH4 is abnormal, an abnormality handling process is executed by the output stop unit 56 (S48), and the abnormality detection program ends.

  On the other hand, as a result of the comparison, if the temperature data match (Yes in S46), the first abnormality determination unit 54 determines that the thermistor TH4 is normal.

  When the first abnormality determination unit 54 determines that the thermistor TH4 is normal, the temperature data acquisition unit 51 acquires temperature data of the thermistor TH1 again (S29). In the abnormality determination method according to the present embodiment, the abnormality detection program (a series of steps of the temperature data acquisition step, the elevation relationship calculation step, and the abnormality determination step) is executed until the abnormality handling process by the output stop unit 56 is executed, or It continues repeatedly until charging is completed.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to the said embodiment.

  For example, in the first embodiment and the second embodiment, both the first abnormality determination step and the second abnormality determination step are executed, but the “invariant mode” abnormality of the thermistors TH1 to TH3 is determined early. If it is specialized to do, only the first abnormality determination step may be executed.

  In the third embodiment, the elevation relationship calculation step is executed immediately after the temperature data acquisition step is executed. However, the control module 50 is provided with the second abnormality determination unit 55 to execute the elevation relationship calculation step. You may perform a 2nd abnormality determination step before.

In the first and second embodiments, the temperature data is acquired in the order of the thermistors TH1, TH2, and TH3, and the elevation relationship with other thermistors is calculated. However, the temperature data acquisition and elevation relationship of the thermistors are calculated. The order of calculation of is arbitrary. Further, the temperature data of the thermistors TH1, TH2, and TH3 may be acquired simultaneously. In the first embodiment, the thermistor TH1, the thermistor TH1, If it is after acquiring the temperature data of TH2 and TH3, they may be performed simultaneously.
Similarly, in the third embodiment, the temperature data is acquired in the order of the thermistors TH1, TH2, TH3, and TH4, and the elevation relationship with the other thermistors is calculated. The order of calculating the height relationship is arbitrary. Further, the temperature data of the thermistors TH1, TH2, TH3, TH4 may be acquired simultaneously, and the thermistors TH1, TH2, TH3, TH4 are also used for calculating the height relationship between one thermistor and the other thermistors. If it is after acquiring the temperature data, it may be performed simultaneously.

  Moreover, in the said embodiment, although the temperature data acquisition part 51 acquires the temperature data of the thermistors TH1-TH4 in the respectively same period (2 ms), this period is arbitrarily set for every thermistor TH1-TH4. Can do.

  Further, in the above-described embodiment, the thermistor TH1 is provided in the vicinity of the switch element having the highest temperature in the PFC module 3, and the thermistor TH2 is provided in the vicinity of the switch element having the highest temperature in the inverter module 4. Although the thermistor TH3 is provided in the vicinity of the corner inside the housing 6 where the temperature is highest in the chargers 1 and 10, the positions of the thermistors TH1 to TH3 can be arbitrarily changed according to the purpose.

  Furthermore, in the said embodiment, although the thermistor is used as a temperature sensor, temperature sensors other than a thermistor may be used if it can detect the temperature of temperature detection object.

DESCRIPTION OF SYMBOLS 1, 10 In-vehicle charger 2 Battery 3 PFC module 4 Inverter module 5, 50 Control module 6 Housing 51 Temperature data acquisition part 52 Height relationship calculation part 53 Memory | storage part 54 1st abnormality determination part 55 2nd abnormality determination part 56 Output stop part

Claims (7)

An abnormality determination method for determining an abnormality of a plurality of temperature sensors provided for each of a plurality of temperature detection objects and detecting a temperature for each of the temperature detection objects,
A temperature data acquisition step of acquiring temperature data detected by each of the plurality of temperature sensors;
A height relationship calculating step for calculating a height relationship of the temperature data among the plurality of temperature sensors;
By comparing the height relationship of the temperature data calculated in the height relationship calculation step with the height relationship of temperature data set in advance based on the temperature to be detected by the plurality of temperature sensors, An abnormality determination step for determining whether or not the temperature sensor is abnormal;
With
A temperature sensor abnormality determination method, wherein a series of steps of the temperature data acquisition step, the height relationship calculation step, and the abnormality determination step are repeatedly executed.   In the comparison, the abnormality determination step acquires the temperature data when the calculated level relationship of the temperature data and the preset level relationship of the temperature data are continuously different a predetermined number of times. The temperature sensor abnormality determination method according to claim 1, wherein the temperature sensor is determined to be abnormal. The plurality of temperature sensors includes a temperature sensor in which a level relationship of temperature data set in advance with other temperature sensors is clear, and an unknown temperature sensor,
The abnormality determination step skips the comparison between the temperature sensors in which the level relationship of the preset temperature data is unknown, and compares the temperature sensors in which the level relationship of the preset temperature data is clear 3. The temperature sensor abnormality determination method according to claim 1, wherein whether or not the plurality of temperature sensors is abnormal is determined by executing the step. When the abnormality determination step of the plurality of temperature sensors based on the comparison is a first abnormality determination step,
Comparing the temperature data with a temperature change range set based on a temperature profile assuming a time change of the temperature data, and obtaining the temperature data when the temperature data is out of the temperature change range The temperature sensor abnormality determination method according to any one of claims 1 to 3, further comprising a second abnormality determination step of determining the detected temperature sensor as abnormal.   2. The device according to claim 1, wherein the plurality of temperature detection targets include an element having the highest temperature among a plurality of elements constituting the module and an ambient temperature in a housing housing at least one of the modules. 5. The temperature sensor abnormality determination method according to any one of 4 above. A vehicle-mounted charger that generates a direct-current output voltage based on an alternating-current input voltage and charges a battery mounted on the electric vehicle using the output voltage,
A PFC module that generates a DC voltage by improving the power factor of the input voltage;
An inverter module for generating the output voltage supplied to the battery by stepping up or down the DC voltage;
A control module for controlling the PFC module and the inverter module;
A housing that houses the PFC module, the inverter module, and the control module;
Among the elements constituting the PFC module, the elements constituting the inverter module, and two or more temperature sensors respectively arranged in two or more of the housings,
The control module is
A temperature data acquisition unit for acquiring temperature data detected by each of the temperature sensors;
A height relationship calculating unit for calculating a height relationship of the temperature data between the temperature sensors;
By comparing the level relationship of the temperature data calculated by the level relationship calculation unit with the level relationship of temperature data set in advance based on the level relationship of the temperature to be detected by the temperature sensor, the temperature An abnormality determination unit that determines whether the sensor is abnormal;
An output stop unit that controls the PFC module and the inverter module to stop the supply of the output voltage when it is determined that the temperature sensor is abnormal;
In-vehicle charger characterized by having. The control module is
When the abnormality determination unit that determines abnormality of the temperature sensor based on the comparison is the first abnormality determination unit,
Comparing the temperature data with a temperature change range set based on a temperature profile assuming a time change of the temperature data, and obtaining the temperature data when the temperature data is out of the temperature change range The on-vehicle charger according to claim 6, further comprising a second abnormality determination unit that determines that the temperature sensor is abnormal.

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