JP2011207350A - Abnormality detection device of electronic control unit storage case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an abnormality of an electronic control unit storage case by a simple constitution.SOLUTION: This abnormality detection device includes a case 19 for storing a HV inverter PCU 18 mounted to a hybrid vehicle to be driven by an engine 11 and a motor generator to control the drive of the motor generator, an intake surge tank 12 for storing intake air to the engine 11, a shutoff valve 17 provided in a communication pipe 16 for making the intake surge tank 12 communicate with the case 19, a pressure sensor 21 for detecting the internal pressure of the case 19, and a control part 30 for switching on/off the shutoff valve 17. The control part 30 includes an internal pressure acquisition means for acquiring the internal pressure of the case 19 from the pressure sensor 21 and an abnormality detection means for outputting an abnormality signal of the case 19 when a change degree of the internal pressure of the case 19 after opening and closing the shutoff valve 17 comes out of a prescribed range.

Description

  The present invention relates to a structure of an abnormality detection device for an electronic control unit storage case.

  An electronic control unit mounted on an automobile is housed in a waterproof case to protect it from rainwater and moisture. Since this waterproof case is disposed in the engine room, it is exposed to a relatively large temperature change. Therefore, when the waterproof case has a completely sealed structure, the internal pressure of the waterproof case changes due to a temperature change, and a pressure difference is generated between the internal pressure of the waterproof case and the atmospheric pressure. If this pressure difference becomes large, the waterproof case may be deformed and the waterproofness of the seal part may be reduced, or in the worst case, the waterproof case may be cracked. There is a risk that moisture may enter the waterproof case and cause a failure such as a short circuit in the electronic control unit. Even if the waterproof case does not crack, if the internal pressure of the waterproof case remains negative with respect to atmospheric pressure for a long time, the waterproof case passes through the wire harness connected to the connector of the electronic control unit. There is a possibility that the water will be absorbed into the inside, which may cause the electronic control unit to be short-circuited and to fail.

  For this reason, there is a waterproof case in which a vent hole communicating with the atmosphere is provided so that the internal pressure of the waterproof case is always kept equal to the atmospheric pressure regardless of temperature changes (see, for example, Patent Document 1). However, rainwater or the like may enter the engine room, so such liquid may enter the inside of the waterproof case through the vent of the waterproof case and cause a failure such as a short circuit in the electronic control unit. It was. For this reason, it has been proposed to provide a breathable breathable membrane that allows only air to pass therethrough without allowing liquid such as rainwater to pass through the vent (see, for example, Patent Document 2).

JP 2000-216555 A Japanese Patent Laid-Open No. 2004-1000063

  However, if the gas permeable membrane is blocked by foreign matter or the like, the case is completely sealed, and there is a risk that moisture may enter the waterproof case due to a change in internal pressure. On the other hand, if the air permeable membrane is damaged, rainwater or the like may enter the case through the air hole and cause a failure such as a short circuit in the electronic control unit. However, in the conventional techniques described in Patent Documents 1 and 2, even if an abnormality such as blockage or breakage of the ventilation membrane occurs, it cannot be detected, so the waterproof case is used for a long time as it is. There has been a problem that the electronic control unit may have a failure such as a short circuit.

  An object of the present invention is to detect an abnormality of an electronic control unit storage case with a simple configuration.

  An abnormality detection device for an electronic control unit storage case according to the present invention is mounted on a vehicle driven by an internal combustion engine, and controls an electronic control unit for controlling the driving force of the vehicle, a case for storing the electronic control unit, and an internal combustion engine. An intake surge tank that stores intake air; a shutoff valve provided in a communication pipe that connects the intake surge tank and the case; a pressure sensor that detects internal pressure of the case; and a control unit that turns on and off the shutoff valve. The abnormality detection device for the electronic control unit storage case, wherein the control unit has an internal pressure acquisition means for acquiring the case internal pressure from the pressure sensor, and the degree of change in the case internal pressure after opening and closing the shutoff valve is out of a predetermined range. And an abnormality detection means for outputting a case abnormality signal.

  In the abnormality detection device for the electronic control unit storage case according to the present invention, the abnormality detection means detects an abnormality depending on whether or not the case internal pressure after the first predetermined time has elapsed after the shut-off valve is opened is outside the first predetermined range. The case is attached to a hole for sucking and exhausting outside air, and has a ventilation film having a predetermined ventilation resistance. The abnormality detection means has an internal pressure of the case within a first predetermined range. When the pressure is higher than the first upper limit pressure, it is determined that the gas permeable membrane is damaged. When the internal pressure of the case is lower than the first lower limit pressure in the first predetermined range, the gas permeable membrane is It is also preferable to judge that it has adhered.

  In the abnormality detection device for the electronic control unit storage case according to the present invention, the abnormality detection means detects an abnormality depending on whether or not the case internal pressure after the second predetermined time has elapsed after the shut-off valve is closed is outside the second predetermined range. The case is attached to a hole for sucking and exhausting outside air, has a ventilation film having a predetermined ventilation resistance, and the abnormality detection means has an internal pressure of the case within a second predetermined range. When the pressure is greater than the second upper limit pressure, it is determined that the gas permeable membrane is broken. When the internal pressure of the case is lower than the second lower limit pressure in the second predetermined range, the gas permeable membrane is It is also preferable to judge that it has adhered.

  In the abnormality detection device for an electronic control unit storage case according to the present invention, the abnormality detection means is configured to detect the pressure when the internal pressure of the case after the third predetermined time is outside the third predetermined range after opening and closing the shut-off valve. It is also preferable to output a sensor abnormality signal.

  The present invention has an effect that an abnormality of the electronic control unit storage case can be detected with a simple configuration.

It is a systematic diagram which shows the structure of the abnormality detection apparatus of the electronic control unit storage case in embodiment of this invention. It is a flowchart which shows operation | movement of the abnormality detection apparatus of the electronic control unit storage case in embodiment of this invention. It is a graph which shows the change of the case internal pressure in the operation | movement shown in FIG. It is a flowchart which shows other operation | movement of the abnormality detection apparatus of the electronic control unit storage case in embodiment of this invention. It is a graph which shows the change of the case internal pressure in the operation | movement shown in FIG. It is a flowchart which shows operation | movement of the abnormality detection apparatus of the electronic control unit storage case in other embodiment of this invention. It is a graph which shows the change of the case internal pressure in the operation | movement shown in FIG. It is a systematic diagram which shows the structure of the abnormality detection apparatus of the electronic control unit storage case in other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an abnormality detection device 100 for an electronic control unit storage case according to this embodiment includes an engine 11 that is an internal combustion engine mounted on a hybrid vehicle, and is mounted on the vehicle to control driving of the engine 11. An engine electronic control unit (ENG-ECU) 24, an HV inverter PCU18 which is an electronic control unit for controlling the drive of the motor generator, and an airtight case 25 in which the engine electronic control unit (ENG-ECU) 24 is housed. The airtight case 19 in which the HV inverter PCU 18 is housed, the intake surge tank 12 that is connected to the intake port of the engine 11 and stores intake air to the engine 11, and the intake surge tank 12 and the case 19 are communicated with each other. A communication pipe 16, an electromagnetic shut-off valve 17 provided on the communication pipe 16, and a case A pressure sensor 21 for detecting the internal pressure of 9, provided in the case 19, and includes a gas permeable membrane 20 attached to the hole to the intake and exhaust the outside air, and a control unit 30 for turning on and off the shut-off valve 17. The ventilation film 20 attached to the hole for sucking and exhausting the outside air of the case 19 is a film that does not allow liquid such as rainwater to pass therethrough but allows only air to pass therethrough and has ventilation resistance. The intake surge tank 12 is connected to an intake pipe 13 that introduces air that has passed through the air filter 14 into the intake surge tank 12, and the intake pipe 13 is provided with an intake flow rate adjustment valve 15 that adjusts the flow rate of intake air. Yes. The HV inverter PCU18 is an electronic control unit that includes an inverter, a DC / DC converter, a booster circuit, and the like. The engine electronic control unit (ENG-ECU) 24 is a computer that includes a CPU that performs signal processing and a storage unit that stores control programs and control data. A signal from an accelerator opening sensor 22 attached to the vehicle is input to an engine electronic control unit (ENG-ECU) 24, and the engine 11 and the intake flow rate control valve 15 are connected to the engine electronic control unit (ENG-ECU) 24. The opening of the intake flow rate adjusting valve 15 is adjusted according to the signal of the opening sensor 22 and the drive of the engine 11 is controlled.

  A pressure sensor 21 that is provided inside the case 19 and detects the internal pressure of the case 19 and the electromagnetic drive unit 17 a of the shut-off valve 17 are connected to the control unit 30. The control unit 30 is a computer including a CPU that performs signal processing inside and a storage unit that stores control programs and control data. The signal from the control unit 30 is configured to be output to the diagnosis device 31.

The operation of the abnormality detection device 100 for the electronic control unit storage case configured as described above will be described with reference to FIGS. In the initial state, the shut-off valve 17 is closed. When the engine 11 is started in this state and the engine 11 is in an idling state, the amount of air supplied to the engine 11 is small because the amount of fuel supplied to the engine 11 is small, the intake flow rate control valve 15 is slightly opened, and the intake surge the internal pressure of the tank 12 has a pressure P _m in the lower negative pressure than the atmospheric pressure. Also, shut-off valve 17 has a closed, case 19 for communicating with the atmosphere through the vent membrane 20, the internal pressure of the case 19 has become the atmospheric pressure P _0.

As shown in step S <b> 101 of FIG. 2, the control unit 30 outputs a command to open the shut-off valve 17. By this command, the electromagnetic drive unit 17a of the shut-off valve 17 operates to open the shut-off valve 17 from the closed state. Further, the control unit 30 outputs a command to open the shut-off valve 17 and starts counting time at the same time. When shut-off valve 17 is opened, in case 19 air is drawn towards the intake surge tank 12 has a pressure P _m in the negative pressure of the case 19 internal pressure early as shown by line a in FIG. 3 The pressure gradually decreases from the atmospheric pressure P ₀ toward the pressure P _m .

As shown in step S102 of FIG. 2, the control unit 30 determines whether the time count has time Delta] t ₁ is the first predetermined time has elapsed. If the time Δt ₁ has not elapsed, the process returns to step S102 in FIG. 2 to continue the time count. Then, as shown in step S <b> 103 of FIG. 2, the control unit 30 acquires the internal pressure of the case 19 by the pressure sensor 21 when the time count reaches the time Δt ₁ .

As shown in FIG. 3, even if the shutoff valve 17 is opened and the air inside the case 19 flows toward the intake surge tank 12, the outside air flows into the case 19 from the ventilation film 20. not pressure immediately the internal pressure P _m and equal pressure in the intake surge tank 12, comes decreased with time as shown by the solid line a in FIG. However, if the gas permeable membrane 20 is damaged, the gas permeable resistance of the gas permeable membrane 20 is lost, so that the amount of outside air flowing into the case 19 increases, and the internal pressure of the case 19 decreases accordingly. Becomes moderate. For this reason, when the gas permeable membrane 20 is broken, as shown by the dotted line b in FIG. 3, the degree of decrease in the pressure within the case 19 with respect to time is smaller than when the gas permeable membrane 20 is normal. come. On the contrary, when the ventilation resistance is increased due to the clogging of the gas permeable membrane 20 due to the foreign matter or the adhesion of the foreign matter, the amount of the outside air flowing into the case 19 is reduced, and the internal pressure of the case 19 is rapidly reduced accordingly. Become. For this reason, when the gas permeable membrane 20 is clogged or fixed, as shown by a one-dot chain line c in FIG. 3, the degree of decrease in the pressure in the case 19 with respect to time is higher than that when the gas permeable membrane 20 is normal. Become bigger. Therefore, when the gas permeable membrane 20 is normal at the time t ₁ shown in FIG. 3 after the _first predetermined time Δt ₁ after the shut-off valve 17 is opened, the internal pressure of the case 19 is the pressure P _2. When 20 is damaged, the internal pressure of the case 19 is P ₁ larger than the pressure P ₂ , and when the ventilation film 20 is clogged or fixed, the internal pressure of the case 19 is higher than the pressure P ₂ . also a low _{P 3.} On the other hand, since the ventilation resistance of the gas permeable membrane 20 varies depending on the gas permeable membrane 20, even when the gas permeable membrane 20 is normal, the pressure after the _first predetermined time Δt _{1 has} elapsed after the shut-off valve 17 is opened. , it fluctuates between a first upper limit pressure _{P 21} and the first lower limit pressure _{P 22.} Therefore, when the pressure acquired at time t ₁ shown in FIG. 3 deviates from the first predetermined pressure range ΔP ₂ determined by the first upper limit pressure P ₂₁ and the first lower limit pressure P ₂₂ , the control unit 30. It is determined that there is an abnormality in the gas permeable membrane 20. The first predetermined time Δt ₁ may be a time during which the internal pressure of the case 19 decreases from the atmospheric pressure P ₀ to the pressure P _m of the intake surge tank 12 and can be arbitrarily selected.

As shown in step S104 of FIG. 2, the control unit 30 compares the internal pressure and the first upper limit pressure _{P 21} of the case 19 obtained by the pressure sensor 21, the internal pressure of the case 19 is first upper limit pressure _{P 21} If it is greater than the threshold value, it is determined that the gas permeable membrane 20 is damaged as shown in step S105 of FIG. As a result, the abnormality of the gas permeable membrane 20 is determined in the diagnosis device 31. Then, as shown in step S <b> 106 of FIG. 2, when the internal pressure of the case 19 is smaller than the first upper limit pressure P <b> ₂₁ , the control unit 30 determines the internal pressure of the case 19 acquired by the pressure sensor 21 and the first pressure. comparing the lower limit pressure _{P 22.} When the internal pressure of the case 19 is smaller than the first lower limit pressure P _22, as shown in step S107 of FIG. 2, it is determined that the gas permeable membrane 20 is clogged or fixed, breathable membrane anchoring signal Output to the diagnosis device 31. As a result, the abnormality of the gas permeable membrane 20 is determined in the diagnosis device 31. The control unit 30, at step S106 in FIG. 2, the internal pressure of the case 19 when not smaller than the first lower limit pressure _{P 22} is the internal pressure of the case 19 and the first upper limit pressure _{P 21} first lower limit pressure It is within the first predetermined pressure range ΔP ₂ between P ₂₂ and it is determined that the gas permeable membrane 20 is normal. As shown in step S108 of FIG. Is output.

  As described above, this embodiment has an effect that the abnormality of the gas permeable membrane 20 can be detected with a simple configuration of detecting the internal pressure of the case 19 in which the HV inverter PCU 18 is housed.

Hereinafter, another operation of the present embodiment will be described with reference to FIGS. 4 and 5. In this operation, the engine 11 is started by idling in the initial state, and the shutoff valve 17 is open. Therefore, as shown in FIG. 5, the internal pressure of the intake surge tank 12, a pressure P _m of less than atmospheric pressure vacuum, since the shut-off valve 17 are open, communication with the intake surge tank 12 the internal pressure of the case 19 which is a also has the same pressure P _m and the internal pressure of the intake surge tank 12.

As shown in step S <b> 201 of FIG. 4, the control unit 30 outputs a command to close the shutoff valve 17. By this command, the electromagnetic drive unit 17a of the shut-off valve 17 is operated to close the shut-off valve 17 from open. In addition, the control unit 30 outputs a command to close the shut-off valve 17 and starts counting time at the same time. When shut-off valve 17 is closed, the case 19 is cut off the intake surge tank 12 has a pressure P _m of the negative pressure, air flows through the gas permeable membrane 20 in the casing 19, the internal pressure of the case 19 Figure from the pressure P _m as indicated by 5 lines d toward the atmospheric pressure P ₀ comes to rise gradually.

As shown in step S202 of FIG. 4, the control unit 30 determines whether the time count has time Delta] t ₂ is the second predetermined time has elapsed. If the time Δt ₂ has not elapsed, the process returns to step S202 in FIG. 4 to continue the time count. Then, as shown in step S < _b > 203 of FIG. 4, the control unit 30 acquires the internal pressure of the case 19 by the pressure sensor 21 when the time count reaches time Δt ₂ .

As shown in FIG. 5, when the shut-off valve 17 is closed, outside air begins to flow into the case 19 from the gas permeable membrane 20, but the gas permeable membrane 20 has air resistance, so that the pressure inside the case 19 immediately reaches the atmospheric pressure P _0. It does not rise and gradually rises with time as shown by the solid line d in FIG. However, if the gas permeable membrane 20 is damaged, the gas permeable resistance of the gas permeable membrane 20 is lost, so the amount of outside air flowing into the case 19 increases, and the internal pressure of the case 19 increases accordingly. Will be faster. For this reason, when the gas permeable membrane 20 is damaged, as shown by a dotted line e in FIG. 5, the degree of increase of the pressure in the case 19 with respect to time is larger than that when the gas permeable membrane 20 is normal. come. On the contrary, when the ventilation resistance is increased due to the clogging of the gas permeable membrane 20 due to foreign matter or the adhering of foreign matter, the amount of outside air flowing into the case 19 is reduced, and the increase in the internal pressure of the case 19 is delayed by that amount. Become. For this reason, when the gas permeable membrane 20 is clogged or fixed, as shown by a one-dot chain line f in FIG. Become smaller. Thus, the shut-off valve 17 the time t ₂ shown in FIG. 5 of the second predetermined time after Delta] t ₂ from the closed, the internal pressure of the case 19 when the gas permeable membrane 20 is normal is the pressure P _5, the gas permeable membrane When 20 is damaged, the internal pressure of the case 19 is P ₄ larger than the pressure P ₅ , and when the gas permeable membrane 20 is clogged or fixed, the internal pressure of the case 19 is higher than the pressure P ₆ . Is also low P ₆ . On the other hand, since the ventilation resistance of the gas permeable membrane 20 varies depending on the gas permeable membrane 20, even when the gas permeable membrane 20 is normal, after the shut-off valve 17 is closed, the pressure after the passage of the second predetermined time Δt ₂ is , it fluctuates between a second upper limit pressure _{P 51} and the second lower limit pressure _{P 52.} Therefore, the control unit 30, if the pressure obtained in the time t ₂ shown in FIG. 5 deviates from the second predetermined pressure range [Delta] P ₅ defined between the second upper limit pressure P ₅₁ by the second lower limit pressure P ₅₂ It is determined that there is an abnormality in the gas permeable membrane 20. The second predetermined time Δt ₂ may be a time during which the internal pressure of the case 19 rises from the pressure P _m of the intake surge tank 12 to the atmospheric pressure P ₀ and can be arbitrarily selected.

As shown in step S204 of FIG. 4, the control unit 30 compares the internal pressure of the case 19 obtained by the pressure sensor 21 and the second upper limit pressure _{P 51,} the internal pressure of the case 19 is a second upper limit pressure _{P 51} If it is greater than the threshold value, it is determined that the gas permeable membrane 20 is damaged, as shown in step S205 of FIG. As a result, the abnormality of the gas permeable membrane 20 is determined in the diagnosis device 31. Then, as shown in step S <b> 206 of FIG. 4, when the internal pressure of the case 19 is smaller than the second upper limit pressure P _< b> ₅₁ , the control unit 30 calculates the internal pressure of the case 19 acquired by the pressure sensor 21 and the second pressure. comparing the lower limit pressure _{P 52.} When the internal pressure of the case 19 is smaller than the second lower limit pressure P _52, as shown in step S207 in FIG. 4, it is determined that the gas permeable membrane 20 is clogged or fixed, breathable membrane anchoring signal Output to the diagnosis device 31. As a result, the abnormality of the gas permeable membrane 20 is determined in the diagnosis device 31. The control unit 30, at step S206 in FIG. 4, the internal pressure of the case 19 when not smaller than the second lower limit pressure _{P 52} is the internal pressure of the case 19 and the second upper limit pressure _{P 51} second lower limit pressure It is in the second predetermined pressure range ΔP ₅ between P ₅₂ and it is determined that the gas permeable membrane 20 is normal, and the gas permeable membrane 20 normal signal is sent to the diagnosis device 31 as shown in step S208 of FIG. Is output.

  Even in the operation described above, this embodiment has an effect that the abnormality of the gas permeable membrane 20 can be detected with a simple configuration of detecting the internal pressure of the case 19 in which the HV inverter PCU 18 is housed.

  An embodiment for detecting an abnormality of the pressure sensor 21 will be described with reference to FIGS. Parts similar to those of the embodiment described above with reference to FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.

Similar to the embodiment described above with reference to FIGS. 1 to 3, in this embodiment as well, in the initial state, the shutoff valve 17 is closed and the engine 11 is operated idling. Therefore, the internal pressure of the case 19 is the atmospheric pressure P ₀ , and the pressure of the intake surge tank 12 is a negative pressure P _m . As shown in step S301 of FIG. 6, the control unit 30 outputs a command to open the shut-off valve 17, and the electromagnetic drive unit 17a of the shut-off valve 17 is operated by this command, and the shut-off valve 17 is closed. The Further, as shown in step S302 in FIG. 6, the control unit 30 closes the shut-off valve 17 and starts counting time. When the shut-off valve 17 is opened, the pressure inside the case 19 gradually decreases, and as shown in FIG. 7, the pressure decreases to approximately the same pressure P _m as the pressure of the intake surge tank 12. The ultimate pressure of the internal pressure of the case 19, on slightly different depending on the state of the gas permeable membrane 20, since there is a tolerance in the pressure sensor 21, the ultimate pressure and the third upper limit pressure P ₇ and the third lower limit pressure P ₈ third so that the variation in the range of the predetermined pressure range [Delta] P _m between. Therefore, the control unit 30, if the pressure obtained in the time t ₃ when 7 out of the third predetermined pressure range [Delta] P _m of the third upper limit pressure P ₇ defined by a third lower limit pressure P ₈ It is determined that the pressure sensor 21 has an abnormality. The third predetermined time Δt ₃ may be any time as long as it is longer than the time during which the internal pressure of the case 19 decreases from the atmospheric pressure P ₀ to the vicinity of the pressure P _m of the intake surge tank 12.

As shown in step S302 of FIG. 6, the control unit 30 determines whether the time count has third time Delta] t ₃ is a predetermined time has elapsed. If the time Δt ₃ has not elapsed, the process returns to step S302 in FIG. 6 to continue the time count. Then, as shown in step S <b> 303 in FIG. 6, the control unit 30 acquires the internal pressure of the case 19 by the pressure sensor 21 when the time count reaches time Δt ₃ .

As shown in step S304 of FIG. 6, the control unit 30 compares the detected internal pressure of the case 19 with the third upper limit pressure P ₇ and the third lower limit pressure P ₈ . Then, as shown in step S305 of FIG. 6, when the pressure of the case 19 is detached from the third predetermined pressure range [Delta] P _m defined between the third upper limit pressure P ₇ by the third lower limit pressure P _8, for example, When the pressure indicates the atmospheric pressure P ₀ , it is determined that there is an abnormality in the pressure sensor 21, and a pressure sensor abnormality signal is output to the diagnosis device 31. As a result, the abnormality of the pressure sensor 21 is determined in the diagnosis device 31. The control unit 30 includes, as shown in step S306 of FIG. 6, a third predetermined pressure range [Delta] P _m the internal pressure of the case 19 has been detected is determined as the third upper limit pressure P ₇ by the third lower limit pressure P ₈ If it is, the pressure sensor 21 is determined to be normal.

  As described above, the present embodiment has an effect that the abnormality of the pressure sensor 21 can be detected with a simple configuration. Further, in the present embodiment, it has been described that the abnormality of the pressure sensor 21 is detected by the change in the internal pressure of the case 19 when the shutoff valve 17 is opened from the closed state, but the description has been given with reference to FIGS. 5 and 6. Similarly to the embodiment, the abnormality of the pressure sensor 21 may be detected by a change in the internal pressure of the case 19 when the shutoff valve 17 is closed from the open state.

  In the embodiment described above, the communication pipe 16 is described as being connected only to the case 19 in which the HV inverter PCU 18 is stored. However, the communication pipe 16 is connected to the case 25 of the engine control unit (ENG-ECU) 24. And the case 25 may be provided with a gas permeable membrane and a pressure sensor to detect an abnormality in each gas permeable membrane and each pressure sensor.

  Hereinafter, an embodiment in which an internal pressure switching device for an electronic control unit storage case according to the present invention is applied to a normal gasoline engine vehicle that is not a hybrid vehicle will be described with reference to FIG. Parts similar to those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, an engine control unit (ENG-ECU) 24 that controls driving of the engine is housed in a case 25, and the communication pipe 16 is connected to the case 25. A pressure sensor 21 that detects the internal pressure of the case 25 is provided inside the case 25, and the gas permeable membrane 20 is attached to the case 25. The configuration other than the above is the same as that of the above-described embodiment.

  The operation of this embodiment is obtained by replacing the case 19 described above with a case 25, and the operation is similar to the operation of the embodiment described above. This embodiment has an effect that the abnormality of the pressure sensor 21 and the gas permeable membrane 20 can be detected with a simple configuration as in the embodiment described above.

  DESCRIPTION OF SYMBOLS 11 Engine, 12 Intake surge tank, 13 Intake pipe, 14 Air filter, 15 Intake flow control valve, 16 Communication pipe, 17 Shutoff valve, 17a Electromagnetic drive part, 18 HV inverter PCU, 19, 25 Case, 20 Ventilation film, DESCRIPTION OF SYMBOLS 21 Pressure sensor, 22 Opening sensor, 24 Engine electronic control unit (ENG-ECU), 30 Control part, 31 Diag apparatus, 100 Abnormality detection apparatus of electronic control unit storage case.

Claims (6)

An electronic control unit that is mounted on a vehicle driven by an internal combustion engine and controls the driving force of the vehicle;
A case for storing the electronic control unit;
An intake surge tank for storing intake air to the internal combustion engine;
A shut-off valve provided in a communication pipe for communicating the intake surge tank and the case;
A pressure sensor for detecting the internal pressure of the case;
A control unit for turning on and off the shut-off valve, and an abnormality detection device for the electronic control unit storage case,
The control unit includes an internal pressure acquisition means for acquiring the case internal pressure from the pressure sensor,
An abnormality detection means for outputting an abnormality signal of the case when the change degree of the internal pressure of the case after opening and closing the shut-off valve is out of a predetermined range;
An abnormality detection device for an electronic control unit storage case, comprising: An abnormality detection device for an electronic control unit storage case according to claim 1,
The abnormality detection means detects an abnormality depending on whether or not the case internal pressure after the first predetermined time has elapsed after opening the shut-off valve is outside the first predetermined range;
An abnormality detection device for an electronic control unit storage case. An abnormality detection device for an electronic control unit storage case according to claim 2,
The case is attached to a hole for sucking and exhausting outside air, and has a ventilation film having a predetermined ventilation resistance.
When the internal pressure of the case is greater than the first upper limit pressure in the first predetermined range, the abnormality detection means determines that the gas permeable membrane is damaged, and the internal pressure of the case is within the first predetermined range. If the pressure is lower than the first lower limit pressure, it is determined that the gas permeable membrane is fixed;
An abnormality detection device for an electronic control unit storage case. An abnormality detection device for an electronic control unit storage case according to claim 1,
The abnormality detection means detects an abnormality depending on whether or not the case internal pressure after the second predetermined time elapses after the shut-off valve is closed,
An abnormality detection device for an electronic control unit storage case. An abnormality detection device for an electronic control unit storage case according to claim 4,
The case is attached to a hole for sucking and exhausting outside air, and has a ventilation film having a predetermined ventilation resistance.
When the internal pressure of the case is larger than the second upper limit pressure in the second predetermined range, the abnormality detection means determines that the gas permeable membrane is damaged, and the internal pressure of the case is in the second predetermined range. If the pressure is lower than the second lower limit pressure, it is determined that the gas permeable membrane is fixed;
An abnormality detection device for an electronic control unit storage case. An abnormality detection device for an electronic control unit storage case according to claim 1,
The abnormality detection means outputs an abnormal signal of the pressure sensor when the case internal pressure after the third predetermined time is outside the third predetermined range after opening and closing the shut-off valve,
An abnormality detection device for an electronic control unit storage case, comprising:

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