JP2006008057A - Wire breaking detection device for vehicle and wire breaking detection method for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent wire breaking of a power source feeding line from being erroneously detected after a fuse is removed in a vehicle factory in a wire breaking detection device for a vehicle and a wire breaking detection method for a vehicle. <P>SOLUTION: Existence of the wire breaking of a second power source feeding line 18 interposed with the fuse 22 on the midway connected to ECU 14 is detected by the ECU 14. However, the detection of the matter that the wire severance is generated on the second power source feeding line 18 is forbidden until the ON number of an ignition switch 20 after that exceeds the predetermined number after predetermined inspection prior to removal of the fuse 22 is performed at an inspection step in the vehicle factory. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle disconnection detection device and a vehicle disconnection detection method, and more particularly to a vehicle disconnection suitable for detecting a disconnection of a power supply line in which a fuse is interposed in the middle of being connected to a predetermined in-vehicle electric load. The present invention relates to a detection device and a disconnection detection method for a vehicle.

2. Description of the Related Art Conventionally, a device in which an intermittent fuse is provided between an in-vehicle electric load and a power source is known (see, for example, Patent Document 1). This fuse cuts off the power supply line between the electric load and the power supply until the vehicle is passed to the user of the vehicle, particularly after the vehicle for overseas use is manufactured, by being removed from a predetermined position. And the interruption | blocking of the above-mentioned power supply line is cancelled | released by being inserted in the predetermined arrangement | positioning position etc. in the vehicle dealer etc. immediately before a vehicle crosses over to a user. Therefore, according to the above configuration, since the dark current flowing from the power source to the in-vehicle electric load is cut from when the vehicle is manufactured until it reaches the user, power consumption is reduced as much as possible.
Japanese Patent Laid-Open No. 5-159693

  However, in a system in which the disconnection of the power supply line connected to the on-vehicle electric load is detected, if the power supply line is interrupted by the fuse to cut the dark current as described above, the power supply line is disconnected. There is a risk of false detection. On the other hand, in order to prevent such erroneous detection, in the configuration in which the fuse is provided between the electric load and the power source as described above, it is only necessary not to detect disconnection of the power supply line itself. It becomes impossible to detect the disconnection abnormality after the vehicle reaches the user. In addition, in order to prevent the above-described erroneous detection, the disconnection of the power supply line between the electric load and the power supply is detected, but the fuse may not be provided. It becomes impossible to effectively cut the dark current between.

  The present invention has been made in view of the above points, and a vehicle disconnection detection device and a vehicle capable of preventing a disconnection of a power supply line from being erroneously detected after a fuse is removed at a vehicle factory. An object of the present invention is to provide a disconnection detection method.

  An object of the present invention is to provide a vehicle disconnection detecting device including a disconnection presence / absence detecting means for detecting the presence / absence of a disconnection of a power supply line connected to a predetermined on-vehicle electric load and having a fuse in the middle thereof. Disconnection detection prohibiting means for prohibiting detection of disconnection of the power supply line by the disconnection presence / absence detection means until the number of times the ignition switch of the vehicle is turned on exceeds a predetermined number of times. Achieved by the device.

  In the present invention, detection that a power supply line with a fuse is disconnected in the middle of being connected to a predetermined on-vehicle electric load is prohibited until the number of times an ignition switch is turned on exceeds a predetermined number. The number of times the vehicle's ignition switch is turned on after the fuse is extracted after the vehicle is manufactured at the vehicle factory until the vehicle reaches the vehicle yard, vehicle dealer, user, etc., and the fuse is inserted again. Limited to Therefore, according to the configuration of the present invention, after the fuse is removed due to dark current cut or the like at the vehicle factory, it is reliably detected that the power supply line is disconnected due to the state. Is prevented.

  According to a second aspect of the present invention, in the vehicle disconnection detecting device according to the first aspect, the disconnection detection prohibiting means prohibits detection of the disconnection of the power supply line by the disconnection presence / absence detection means. In the case where it is detected that the power supply line is not disconnected even before the ignition switch of the vehicle is turned on after the predetermined number of times has been started, the disconnection presence / absence detecting means If the prohibition of the detection that the disconnection of the power supply line has occurred is canceled, the disconnection detection of the power supply line is prevented from being prohibited unnecessarily for a long time.

  Further, the above object is to provide a disconnection detecting device for a vehicle comprising a disconnection presence / absence detecting means for detecting the disconnection presence / absence of a power supply line connected to a predetermined in-vehicle electric load and having a fuse in the middle thereof. The vehicle disconnection detection device includes disconnection detection prohibiting means for prohibiting detection of disconnection of the power supply line by the disconnection presence / absence detection means until the travel distance or travel distance of the vehicle exceeds a predetermined distance. Achieved by the device.

  In the present invention, detection that a disconnection has occurred in a power supply line in which a fuse is interposed in the middle of being connected to a predetermined in-vehicle electric load is prohibited until the traveling distance or moving distance of the vehicle exceeds a predetermined distance. The distance that the vehicle travels or travels to a certain distance from when the fuse is removed after the vehicle is manufactured at the vehicle factory until the vehicle arrives at the vehicle yard, vehicle dealer, user, etc. and the fuse is reinserted. Limited. Therefore, according to the configuration of the present invention, after the fuse is removed due to dark current cut or the like at the vehicle factory, it is reliably detected that the power supply line is disconnected due to the state. Is prevented.

  In these cases, as described in claim 4, in the disconnection detection device for a vehicle according to any one of claims 1 to 3, the disconnection detection prohibiting means extracts the fuse in an inspection process at a vehicle factory. If it is prohibited to detect that the power supply line is disconnected by the disconnection presence / absence detecting means after the previous predetermined inspection is performed, the predetermined inspection before the fuse is removed after the vehicle is manufactured. Since the disconnection of the power supply line can be detected as usual before the operation is performed, it is avoided that the detection of the disconnection of the power supply line is excessively limited.

  Further, the above object is to provide a disconnection detection method for a vehicle comprising a disconnection presence / absence detection step for detecting the disconnection presence / absence of a power supply line connected to a predetermined in-vehicle electric load and having a fuse interposed therebetween. In the inspection process at the vehicle factory, a disconnection detection for prohibiting detection of disconnection in the power supply line by the disconnection presence / absence detection step after a predetermined inspection is performed before the fuse is removed. A forbidden step, and a disconnection detection restarting step for resuming detection of disconnection in the power supply line by the disconnection presence / absence detection step when the number of times the ignition switch of the vehicle is turned on exceeds a predetermined number of times. This is achieved by the vehicle disconnection detection method provided.

  In the present invention, the detection that the power supply line in which the fuse intervenes in the middle of being connected to the predetermined on-vehicle electric load is broken is detected by a predetermined inspection before the fuse is removed in the inspection process at the vehicle factory. It is prohibited after being performed, and is restarted when the number of times the ignition switch of the vehicle is turned on exceeds a predetermined number. The number of times the vehicle's ignition switch is turned on after the fuse is extracted after the vehicle is manufactured at the vehicle factory until the vehicle reaches the vehicle yard, vehicle dealer, user, etc., and the fuse is inserted again. Limited to Therefore, according to the configuration of the present invention, after the fuse is removed due to dark current cut or the like at the vehicle factory, it is reliably detected that the power supply line is disconnected due to the state. Is prevented.

  Further, the above object is to provide a disconnection detection method for a vehicle comprising a disconnection presence / absence detection step for detecting the disconnection presence / absence of a power supply line connected to a predetermined in-vehicle electric load and having a fuse in the middle thereof. In the inspection process at the vehicle factory, a disconnection detection for prohibiting detection of disconnection in the power supply line by the disconnection presence / absence detection step after a predetermined inspection is performed before the fuse is removed. A vehicle comprising: a prohibiting step; and a disconnection detection restarting step for resuming detection of disconnection in the power supply line in the disconnection presence / absence detection step when a travel distance or a travel distance of the vehicle exceeds a predetermined distance. This is achieved by the disconnection detection method.

  In the present invention, the detection that the power supply line in which the fuse intervenes in the middle of being connected to the predetermined on-vehicle electric load is broken is detected by a predetermined inspection before the fuse is removed in the inspection process at the vehicle factory. It is prohibited after being performed, and is resumed when the travel distance or travel distance of the vehicle exceeds a predetermined distance. The distance that the vehicle travels or travels to a certain distance from when the fuse is removed after the vehicle is manufactured at the vehicle factory until the vehicle arrives at the vehicle yard, vehicle dealer, user, etc. and the fuse is reinserted. Limited. Therefore, according to the configuration of the present invention, after the fuse is removed due to dark current cut or the like at the vehicle factory, it is reliably detected that the power supply line is disconnected due to the state. Is prevented.

  According to the first to sixth aspects of the present invention, it is possible to prevent the disconnection of the power supply line from being erroneously detected after the fuse is removed at the vehicle factory.

  FIG. 1 is a system configuration diagram of a vehicle disconnection detection device 10 mounted on a vehicle according to an embodiment of the present invention. As shown in FIG. 1, the system of this embodiment includes a battery 12 mounted on a vehicle and an ECU 14 as an electric load that operates by power supply from the battery 12. The ECU 14 is, for example, an electronic control unit (ECU) for detecting the presence or absence of an occupant seated on a vehicle seat, an ECU for performing engine control or brake control, and the like.

  Two power supply lines 16 and 18 are connected between the battery 12 and the ECU 14, respectively. An ignition switch 20 is interposed in the middle of the first power supply line 16. The ignition switch 20 is a switch that is turned on by an ignition-on operation of the vehicle occupant. The ECU 14 detects the ON state of the ignition switch 20 based on the voltage generated in the first power supply line 16. When the ignition switch 20 is in the ON state, the ECU 14 is activated by being supplied with power from the battery 12 via the first power supply line 16, and detects the presence or absence of a seated occupant in the vehicle seat.

  Further, a fuse 22 that allows the power supply line 18 to be interrupted is interposed in the middle of the second power supply line 18. The second power supply line 18 is used for a specific function of the ECU 14 (for example, holding data in the memory or when the first power supply line 16 is cut off) even when the ignition switch 20 is in an off state. It is provided to ensure power supply from the battery 12 to the ECU 14 so as to realize the operation preparation of the microprocessor, detection of child seat mounting on the vehicle seat, and the like. Further, the fuse 22 is mainly connected to the second battery 12 from the battery 12 until the vehicle is transported by ship, train, truck, etc. to the vehicle dealer (dealer) or vehicle user (purchaser). In order to cut the current (dark current) that flows to the ECU 14 via the power supply line 18, it is provided upstream of the ECU 14. The fuse 22 is temporarily inserted into a desired position in the middle of the second power supply line 18 at the time of manufacturing the vehicle. However, after the inspection after the manufacturing is completed, the fuse 22 is pulled out by an operator or the like, and works again in the vehicle yard or dealer after transportation. Inserted by a person. If the fuse 22 is removed, it is impossible to execute the specific function of the ECU 14 described above.

  Further, the ECU 14 detects the presence or absence of disconnection that occurs in the second power supply line 18 in a situation where power is supplied from the battery 12 via the first power supply line 16 because the ignition switch 20 is in the ON state. It has a function to do.

  By the way, in the present embodiment, the presence or absence of disconnection of the second power supply line 18 is detected as described above, but the fuse 22 for cutting the dark current is interposed in the middle of the second power supply line 18. Has been. For this reason, when the fuse 22 is extracted from the second power supply line 18, the same breaking phenomenon as the second power supply line 18 is disconnected occurs. As a result, the ECU 14 causes the second power supply line 18 to be disconnected. There is a risk of erroneous detection that the supply line 18 is disconnected even though it is not actually disconnected. Therefore, the vehicle disconnection detecting device 10 of the present embodiment is characterized in that such inconvenience is avoided and erroneous detection of disconnection of the second power supply line 18 is prevented. Hereinafter, with reference to FIG.2 and FIG.3, the characteristic part of a present Example is demonstrated.

  FIG. 2 shows a time chart realized in this embodiment. When the manufacture of the vehicle is completed by inserting the fuse 22 in the middle of the second power supply line 18, it is possible to detect whether the second power supply line 18 is disconnected in the ECU 14. In this state, if the disconnection actually occurs in the second power supply line 18, the ECU 14 detects the disconnection (+ B disconnection detection).

  Further, when the fuse 22 is inserted in the second power supply line 18 and the vehicle manufacture is completed, thereafter, various inspections are performed on the completed vehicle at the vehicle factory. When all vehicle inspections are completed, the above-described fuse 22 is removed in order to cut off the dark current thereafter in the vehicle factory before shipment or in the vehicle yard before transport. Therefore, before the fuse 22 is removed, the detection of the disconnection in the second power supply line 18 is prohibited by using the vehicle inspection as a trigger or the completion of the predetermined inspection therein as a trigger ( + B disconnection detection prohibited), it is possible to prevent erroneous detection that the second power supply line 18 is disconnected after the fuse 22 is removed.

  In addition, after the fuse 22 is extracted at the above-described timing, it is inserted again at a vehicle yard or dealer before it reaches the user of the vehicle after shipment / transportation. On the other hand, the number of times that the ignition switch 20 of the vehicle is switched from the OFF state to the ON state after the inspection is completed at the vehicle factory and before the fuse 22 is reinserted is reached. For example, it is limited to 30 times or 50 times. Therefore, until the number of times the ignition switch 20 is turned on, which is presumed to be the timing at which the re-insertion of the fuse 22 has already been performed, after the vehicle inspection or the predetermined inspection therein is completed exceeds the predetermined number of times. If the detection of the disconnection in the second power supply line 18 is prohibited, it is erroneously detected that the disconnection has occurred in the second power supply line 18 due to the extraction of the fuse 22. This can be prevented.

  Furthermore, after the number of times the ignition switch 20 is turned on, which is estimated to be the timing when the re-insertion of the fuse 22 has already been performed after completion of the vehicle inspection or the predetermined inspection therein, exceeds the predetermined number of times. If the detection prohibition of the disconnection of the second power supply line 18 is canceled, the ECU 14 can detect whether or not the second power supply line 18 is disconnected as usual. When the disconnection occurs in the second power supply line 18, the ECU 14 detects the disconnection (+ B disconnection detection).

  FIG. 3 shows a flowchart of an example of a control routine executed by the ECU 14 in the vehicle disconnection detection device 10 of this embodiment in order to realize the above function. The routine shown in FIG. 3 is a routine that is repeatedly activated each time the ignition switch 20 of the vehicle is turned on. When the routine shown in FIG. 3 is started, first, the process of step 100 is executed.

  In step 100, it is determined whether or not a count-up function to be described later is locked and a flag indicating the state is set. The flag indicating the lock of the count-up function is set when the number of times the ignition switch 20 is turned on after the completion of all vehicle inspections or predetermined inspections therein exceeds a predetermined number. As a result, if it is determined that the count-up function is not locked, the process of step 102 is executed next.

  In step 102, whether or not all inspections of the completed vehicle have been carried out at the vehicle factory, or predetermined inspection (for example, zero-point reset adjustment relating to seat load for detecting the presence or absence of a seated passenger in the ECU 14) ) Is determined. If such an implementation has not yet been completed, it can be determined that the fuse 22 inserted on the second power supply line 18 in the manufacturing stage has not yet been removed for dark current cut, so that the second operation is performed as usual. There is no inconvenience in detecting whether or not the power supply line 18 is disconnected. Therefore, if such a determination is made, the process of step 104 is executed next.

  In step 104, processing for operating detection of the presence or absence of disconnection of the second power supply line 18 is executed as usual. When the process of step 104 is executed, when the power supply from the battery 12 to the ECU 14 via the line 18 is cut off due to the actual disconnection of the second power supply line 18, The disconnection is detected by the ECU 14. When the process of step 104 is completed, the current routine is terminated.

  On the other hand, when all or predetermined inspections are completed in step 102, the fuse 22 is removed for dark current cut after that, so that the second power supply line 18 is broken. It may not be reasonable to detect. Therefore, if such a determination is made in step 102, the process of step 106 is executed next.

  In step 106, a process of incrementing an ignition counter (IG counter) CNT by “1” is executed. The IG counter CNT is a counter for counting the number of times the ignition switch 20 is switched from the off state to the on state after all or predetermined inspections have been completed at the vehicle factory.

  In step 108, it is determined whether or not the IG counter CNT incremented in step 106 has exceeded the first predetermined number of times CNT0. Note that the first predetermined number of times CNT0 is determined after the completion of all or predetermined inspections at the vehicle factory until the fuse 22 extracted for dark current cut is reinserted. The number of times that the switch 20 is generally estimated to switch from the off state to the on state is set to, for example, 30 times or 50 times. As a result, if it is determined that CNT> CNT0 does not hold, there is a possibility that the fuse 22 has been removed from the second power supply line 18 but has not yet been reinserted. 110 is executed.

  In step 110, processing for prohibiting detection that the second power supply line 18 is broken is executed. When the processing of step 110 is executed, even if the power supply from the battery 12 to the ECU 14 via the second power supply line 18 is cut off, the second power supply line 18 is disconnected. Is not detected. When the processing of step 110 is completed, the current routine is terminated.

  On the other hand, if it is determined in step 108 that CNT> CNT0 is satisfied, it can be determined that the reinsertion of the fuse 22 extracted from the second power supply line 18 has been completed. The process is executed.

  In step 112, processing for locking the count-up function by setting a flag is executed. When the process of step 112 is executed, the process of step 104 described above is executed next, and the detection of the presence or absence of disconnection of the second power supply line 18 is operated as usual. Thereafter, each time the ignition switch 20 is turned on, an affirmative determination is made in step 100, and in step 104, the detection of the presence or absence of disconnection of the second power supply line 18 is continuously operated.

  According to the routine shown in FIG. 3, after the predetermined inspection is performed before the fuse 22 inserted on the second power supply line 18 is extracted at the manufacturing stage in the inspection process at the vehicle factory, the ignition switch is thereafter operated. Until the number of times CNT 20 is turned on exceeds the first predetermined number CNT0, detection that the second power supply line 18 is broken can be prohibited.

  Generally, after the above-described inspection at the vehicle factory is performed, the fuse 22 inserted on the second power supply line 18 in the manufacturing stage before the ignition switch 20 is turned on more than the first predetermined number CNT0. Is extracted, and the extracted fuse 22 is inserted again. That is, after the fuse 22 is extracted after the vehicle is manufactured at the vehicle factory, the ignition switch 22 is turned on to a certain extent until the vehicle reaches the vehicle yard, vehicle dealer, user, etc. and the fuse 22 is inserted again. Limited to the number of times.

  Therefore, according to the vehicle disconnection detection device 10 of the present embodiment, the state after the fuse 22 is extracted to cut the dark current from the battery 12 to the ECU 14 via the second power supply line 18 is removed. Therefore, it is possible to reliably prevent erroneous detection that the second power supply line 18 is disconnected even though the second power supply line 18 is not actually disconnected. In this regard, a system that properly detects the presence or absence of disconnection of the second power supply line 18 from the battery 12 to the ECU 14 as an electric load is provided on the downstream side of the fuse 22 on the second power supply line 18. It is possible to construct without impairing the function (specifically, the function of cutting dark current).

  In this embodiment, the number of times the ignition switch 20 is turned on is the first predetermined number of times after the vehicle is manufactured at the vehicle factory, before the predetermined inspection is performed, and after the predetermined inspection is performed. After exceeding CNT0, the presence or absence of disconnection of the second power supply line 18 is detected as usual. At such timing, since the fuse 22 should be inserted on the second power supply line 18, if the power supply via the second power supply line 18 is cut off, the second It is possible to determine that the power supply line 18 is disconnected, and according to the configuration of the present embodiment described above, it is possible to actually detect the disconnection.

  Therefore, according to the vehicle disconnection detection device 10 of the present embodiment, the disconnection detection of the second power supply line 18 is prohibited during the above-described predetermined period to prevent erroneous detection, while the disconnection detection is excessive. Therefore, the second power supply line 18 can be avoided not only after the vehicle has been delivered to the user but also before the vehicle is shipped from the vehicle factory. In fact, it is possible to effectively prevent the occurrence of disconnection even though disconnection has actually occurred.

  In the above-described embodiment, the ECU 14 corresponds to the “predetermined in-vehicle electric load” recited in the claims, and the ECU 14 executes the process of step 104 in the routine shown in FIG. The "disconnection detection detecting means" and the "disconnection presence detection step" described in the claims are executed by performing the processing of step 110, so that the "disconnection detection prohibiting means" and "disconnection detection prohibition" described in the claims are performed. By executing the processing of Steps 112 and 104 after the “Step” makes an affirmative determination in Step 108, the “disconnection detection restarting step” described in the claims is realized.

  By the way, in the above-described embodiment, the ECU 14 is an ECU for detecting the presence or absence of an occupant in a vehicle seat, engine control, brake control, and the like, and the ignition switch 20 is a switch that is turned on by an ignition on operation of the vehicle occupant. The ECU 14 may be an ECU or the like for providing navigation information or audio information to the vehicle occupant, and the ignition switch 20 may be a switch that is turned on by an accessory on operation of the vehicle occupant. In this case, the second power supply line 18 supplies power to the ECU 14 so that a specific function of the ECU 14 such as a clock function and storage of an audio channel is realized even when the ignition switch 20 is in an OFF state. It will be provided for securing.

  In the above-described embodiment, the second power supply is performed until the number of times CNT when the ignition switch 20 is turned on exceeds the first predetermined number of times CNT0 after the predetermined inspection is performed in the inspection process at the vehicle factory. The detection that the line 18 is disconnected is prohibited. However, if the disconnection detection is uniformly prohibited until the number of times CNT of the ignition switch 20 exceeds CNT0, that is, the ignition switch 20 is turned on. Assuming that the prohibition of disconnection detection is canceled only after the number of times CNT exceeds CNT0, the above-described disconnection detection is prohibited when the period from when the fuse 22 is reinserted until the number of ON times CNT exceeds CNT0 is extremely long. Is unnecessarily long.

  Here, in the above-described embodiment, the second power supply line 18 is disconnected until the predetermined number of times the ignition switch 20 is turned on after the predetermined inspection is performed in the inspection process at the vehicle factory. However, even during that period, it is possible to detect that the second power supply line 18 is not broken (+ B non-breakage detection).

  FIG. 4 shows a flowchart of an example of a control routine executed by the ECU 14 in the vehicle disconnection detection device that is a modification of the present invention. In FIG. 4, steps that execute the same processing as the steps shown in FIG. 3 are given the same reference numerals, and descriptions thereof are omitted or simplified. That is, if it is determined in step 108 that CNT> CNT0 does not hold, the process of step 150 is executed next.

  In step 150, (1) the IG counter CNT incremented in step 106 exceeds the second predetermined number CNT1 smaller than the first predetermined number CNT0, and (2) + B non-breaking detection counter is It is determined whether or not the third predetermined number of times CNT2 has been exceeded. Note that this second predetermined number of times CNT1 is determined after the completion of all or predetermined inspections at the vehicle factory until the fuse 22 extracted for dark current cut is reinserted. This is the minimum number of times that is generally estimated that the switch 20 switches from the off state to the on state, and is set to 20 times, for example. Further, the + B non-breakage detection counter detects that the second power supply line 18 is not broken after the IG counter CNT exceeds CNT1 and the condition (1) is satisfied, every time the ignition switch 20 is turned on. The third predetermined number of times CNT2 is the number of times that can be reliably determined that the second power supply line 18 is not broken, for example, 0. May be set once, but may be set once or more in order to ensure the reliability of non-breaking detection of + B.

  As a result, if at least one of the above conditions (1) and (2) is not satisfied, the fuse 22 may be removed from the second power supply line 18, so that the second power supply It is appropriate to prohibit the detection that the line 18 is disconnected (+ B disconnection detection). Therefore, if such a determination is made, the process of step 110 is executed next. On the other hand, if both of the above conditions (1) and (2) are satisfied, it can be determined that the fuse 22 is inserted on the second power supply line 18, and therefore it is necessary to prohibit + B disconnection detection. Absent. Therefore, when such a determination is made, the count-up function is locked in the next step 112, and the detection of the disconnection of the second power supply line 18 is normally operated in the step 104.

  According to the routine shown in FIG. 4, it is prohibited to detect that the second power supply line 18 is disconnected after a predetermined inspection is performed before the fuse 22 is extracted in the inspection process at the vehicle factory. On the other hand, even after the ignition switch 20 has been turned on more than the first predetermined number CNT0, after the second predetermined number of times CNT1 at which it can be determined that the fuse 22 has been reliably removed after the inspection. When the detection that the disconnection of the second power supply line 18 has not occurred (+ B non-disconnection detection) is made, the prohibition of + B disconnection detection is canceled and the disconnection detection can be resumed.

  If the + B non-disconnection detection is performed in a situation where the number of ON times CNT of the ignition switch 20 after the predetermined inspection exceeds the second predetermined number CNT1 even before it exceeds the first predetermined number CNT0, It can be determined that the fuse 22 that has been removed has been reinserted onto the second power supply line 18. Once the fuse 22 has been reinserted, there is no inconvenience even if the second power supply line 18 is detected as being disconnected as usual. Therefore, according to the vehicle disconnection detecting device of the present modification, after the predetermined inspection at the vehicle factory, detection that the second power supply line 18 is disconnected is unnecessarily prohibited for a long period of time. Can be avoided. In this regard, it is possible to reliably prevent the second power supply line 18 from being treated as having no disconnection despite the actual disconnection.

  In the above embodiment, the end of the period during which the detection of the disconnection of the second power supply line 18 after the predetermined inspection before the fuse 22 is taken out at the vehicle factory is prohibited is referred to as the subsequent ignition switch 20. However, the parameter for setting the end period is not limited to this. For example, the parameter is based on the cumulative travel distance or travel distance of the vehicle thereafter, and the cumulative travel distance or travel distance is The disconnection detection of the second power supply line 18 may be prohibited until the predetermined distance is exceeded.

  In general, the moving distance of the vehicle is somewhat long from the vehicle factory where the vehicle inspection is performed and the fuse 22 is extracted to the vehicle yard or dealer where the fuse 22 is reinserted after the vehicle is shipped and transported. The distance that the vehicle travels for loading or the like is somewhat long. Therefore, until the accumulated travel distance or travel distance of the vehicle exceeds a predetermined distance that is generally estimated to travel or move from the time when the inspection is performed until the fuse 22 is reinserted. If the detection of disconnection of the power supply line 18 of the second power supply line 18 is prohibited and then the detection prohibition is canceled, the above-described implementation of setting the end of the disconnection detection prohibition period based on the number of ON times CNT of the ignition switch 20 It is possible to obtain the same effect as the example.

  Further, in the above embodiment, the fuse 22 is provided on the second power supply line 18 between the battery 12 and the ECU 14, but the ECU 14 downstream of the fuse 22 is not limited to one. Two or more ECUs 14 may be arranged in parallel downstream of the fuse 22.

1 is a system configuration diagram of a vehicle disconnection detection device according to an embodiment of the present invention. It is a time chart implement | achieved in a present Example. It is a flowchart of the control routine performed in the disconnection detection apparatus for vehicles of a present Example. It is a flowchart of the control routine performed in the disconnection detection apparatus for vehicles which is a modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disconnection detection apparatus for vehicles 12 Battery 14 ECU (electric load)
16 First power supply line 18 Second power supply line 20 Ignition switch 22 Fuse

Claims (6)

A disconnection detecting device for a vehicle, comprising a disconnection presence / absence detecting means for detecting the presence / absence of disconnection of a power supply line connected to a predetermined on-vehicle electric load and having a fuse interposed therebetween,
A vehicle comprising: disconnection detection prohibiting means for prohibiting detection of disconnection of the power supply line by the disconnection presence / absence detection means until the number of times the ignition switch of the vehicle is turned on exceeds a predetermined number of times. Disconnection detection device.   The disconnection detection prohibiting means starts after prohibiting the detection of the disconnection of the power supply line by the disconnection presence / absence detection means and before the number of times the vehicle ignition switch is turned on exceeds the predetermined number of times. If it is detected that the power supply line is not disconnected, the prohibition of detection that the power supply line is disconnected by the disconnection presence / absence detecting means is canceled. The disconnection detection device for a vehicle according to claim 1. A disconnection detecting device for a vehicle, comprising a disconnection presence / absence detecting means for detecting the presence / absence of disconnection of a power supply line connected to a predetermined on-vehicle electric load and having a fuse interposed therebetween,
A disconnection for a vehicle, characterized by comprising disconnection detection prohibiting means for prohibiting detection of disconnection of the power supply line by the disconnection presence / absence detection means until the travel distance or travel distance of the vehicle exceeds a predetermined distance. Detection device.   The disconnection detection prohibiting means prohibits detection by the disconnection presence / absence detection means that the power supply line is disconnected after a predetermined inspection is performed before the fuse is removed in an inspection process at a vehicle factory. The disconnection detection device for a vehicle according to any one of claims 1 to 3, wherein: A disconnection detection method for a vehicle comprising a disconnection presence / absence detection step for detecting the disconnection presence / absence of a power supply line connected to a predetermined in-vehicle electric load and having a fuse interposed therebetween,
A disconnection detection prohibiting step for prohibiting detection of disconnection in the power supply line by the disconnection presence / absence detection step after a predetermined inspection is performed before the fuse is removed in an inspection process at a vehicle factory;
When the number of times the ignition switch of the vehicle is turned on exceeds a predetermined number, a disconnection detection restarting step for restarting detection that the power supply line is disconnected by the disconnection presence / absence detection step;
A disconnection detection method for a vehicle, comprising: A disconnection detection method for a vehicle comprising a disconnection presence / absence detection step for detecting the disconnection presence / absence of a power supply line connected to a predetermined in-vehicle electric load and having a fuse interposed therebetween,
A disconnection detection prohibiting step for prohibiting detection of disconnection in the power supply line by the disconnection presence / absence detection step after a predetermined inspection is performed before the fuse is removed in an inspection process at a vehicle factory;
A disconnection detection restarting step for restarting detection of disconnection in the power supply line by the disconnection presence / absence detection step when the travel distance or movement distance of the vehicle exceeds a predetermined distance;
A disconnection detection method for a vehicle, comprising:

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