In-vehicle control device

Abstract

A control device (1) for a vehicle has a plurality of relays (10A, 10B, 10C, 10D), a control section (13), and a plurality of current detecting sections (11A, 11B, 11C, 11D). The plurality of current detecting sections (11A, 11B, 11C, 11D) detect values of currents flowing through respective branch paths (81A, 81B, 81C, 81D). Each of the relays (10A, 10B, 10C, 10D) is switched between an allowable state in which energization of the respective branch paths (81A, 81B, 81C, 81D) is allowed and a cutoff state in which the energization of the respective branch paths (81A, 81B, 81C, 81D) is cut off. The control section (13) switches the relay (10A, 10B, 10C, 10D) provided at a specific branch path, which is a branch path having the largest rising speed of the current value among the plurality of branch paths (81A, 81B, 81C, 81D), to the cutoff state on the basis of the detection results of the current detecting sections (11A, 11B, 11C, 11D) in a case where a predetermined abnormal state is detected.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a control device for a vehicle. BACKGROUND

[0002] Patent Literature 1 discloses a power supply device for an automobile. The power supply device for an automobile distributes electric power from a main power supply to a plurality of electric components through a main power supply distribution device. A power supply distribution device by section is provided between the main power supply distribution device and each electric component. The power supply distribution device by section is connected to the main power supply distribution device via a main power supply distribution line provided with a fuse. Therefore, when an abnormal state such as a ground fault occurs and a large current flows to the main power supply distribution line, the main power supply distribution line is fused by the fuse.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 9-189736 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In a case where an abnormal state occurs in a branch passage connected to each electric component branched from the main power supply distribution device, it is desirable to immediately perform separation so that the influence does not spread to a branch passage in which no abnormal state occurs. However, in a case where fusing is performed by a fuse, there is a concern that time is required until fusing.

[0008] Therefore, in the present disclosure, an object is to provide a technology capable of immediately separating a branch passage in which an abnormal state is likely to occur.

[0009] SOLUTION TO THE PROBLEM

[0010] The control device for a vehicle according to the present disclosure is applied to a vehicle-mounted system having a power supply unit, an electric power passage, and a plurality of branch passages, the electric power passage being a path through which electric power is supplied from the power supply unit, the plurality of branch passages being paths branched from the electric power passage, wherein the control device for a vehicle includes a plurality of relays, a control unit that controls the plurality of relays, and a current detection unit that detects a value of each current flowing through each of the branch passages, each of the relays is switched between an allowed state in which energization of each of the branch passages is allowed and a cut-off state in which energization of each of the branch passages is cut off, and the control unit switches the relay provided in a specific branch passage to the cut-off state on the basis of a detection result of the current detection unit in a case where a predetermined abnormal state is detected, the specific branch passage being a branch passage in which a rising speed of the value of the current is the fastest among the plurality of branch passages.

[0011] Effects of Invention

[0012] According to the present disclosure, a branch path having a high possibility of abnormal state occurrence can be immediately separated. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a circuit diagram schematically showing a structure of a vehicle-mounted system to which a control device for vehicle use according to a first embodiment is applied.

[0014] Figure 2 is an explanatory diagram schematically showing the vehicle-mounted system at the time of abnormal state occurrence. DETAILED DESCRIPTION

[0015] [Explanation of Embodiments of the Present Disclosure]

[0016] First, an embodiment of the present disclosure will be explained.

[0017] 〔1〕 A control device for vehicle use applied to a vehicle-mounted system having a power supply section, a power path, and a plurality of branch paths, the power path being a path through which power is supplied from the power supply section, the plurality of branch paths being paths branched from the power path, wherein the control device for vehicle use comprises: a plurality of relays; a control section that controls the plurality of relays; and a current detection section that detects a value of each current flowing through each of the branch paths, each of the relays being switched between an allowed state in which energization of each of the branch paths is allowed and a cut-off state in which energization of each of the branch paths is cut off, the control section switching the relay provided in a specific branch path to the cut-off state based on a detection result of the current detection section in a case where a predetermined abnormal state is detected, the specific branch path being a branch path having a largest rising speed of current value among the plurality of branch paths.

[0018] The control device for vehicle use can cut off energization of the specific branch path having the largest rising speed of current value in a case where an abnormal state is detected. Therefore, the specific branch path having a high possibility of rapid rising of current can be immediately separated from other branch paths.

[0019] 〔2〕 The control device for vehicle use according to 〔1〕, wherein the control device for vehicle use comprises a voltage detection section that detects a voltage of the power path or the branch path, the control section switching the relay provided in the specific branch path to the cut-off state in a case where the voltage detected by the voltage detection section is reduced to a threshold voltage or less.

[0020] According to this structure, in a case where grounding occurs in one of the branch paths, the branch path having a high possibility of grounding can be immediately separated from other branch paths.

[0021] 〔3〕 The control device for vehicle according to <2>, wherein the voltage detection section detects the voltage of the power passage.

[0022] According to this structure, even in the case where a certain branch passage is open-circuited, the voltage of the branch passage that is not open-circuited can be detected.

[0023] 〔4〕 The control device for vehicle according to any one of <1> to <3>, wherein the control section takes the branch passage in which the value obtained by time-differentiating the current value is the largest as the specific branch passage, and switches the relay provided in the specific branch passage to the open-circuit state.

[0024] According to this structure, the specific branch passage in which the rising speed of the current value is the fastest can be determined by comparing the values obtained by time-differentiating the current values, and the relay provided in the specific branch passage can be switched to the open-circuit state.

[0025] 〔5〕 The control device for vehicle according to <4>, wherein the control section has: a determination circuit that outputs an abnormality signal in the case where the abnormality state occurs; a differentiation circuit that time-differentiates each current value detected by the current detection section for each of the branch passages; a selection circuit that outputs a selection signal indicating the branch passage in which the largest differential value among differential values obtained by time-differentiating each current value is generated, on the basis of the calculation results of each of the differentiation circuits; and an open-circuit circuit that switches the relay provided in the branch passage indicated by the selection signal to the open-circuit state in the case where the abnormality signal is input.

[0026] According to this structure, the process of determining the specific branch passage and switching the relay to the open-circuit state is simplified, and thus the relay provided in the specific branch passage can be switched to the open-circuit state more quickly in the case where the abnormality state occurs.

[0027] 〔6〕 The control device for vehicle according to any one of <1> to <5>, wherein the control section decides the threshold value for determining the abnormality state on the basis of the power supply condition from the power supply section.

[0028] According to this structure, the threshold value for determining the abnormality state is decided on the basis of the power supply condition from the power supply section, and thus the false determination of the abnormality state can be suppressed.

[0029] <First Embodiment>

[0030] In Figure 1The in-vehicle system 100 illustrated in FIG. 1 is a system mounted on a vehicle. The in-vehicle system 100 includes a power supply portion 90, a plurality of loads 91A, 91B, 91C, 91D, a power path 80, a plurality of branch paths 81A, 81B, 81C, 81D, and an in-vehicle control device 1.

[0031] The power supply portion 90 is, for example, a storage battery such as a lead storage battery, a DCDC converter, an alternator, or the like. The power supply portion 90 is electrically connected to the power path 80. Electric power based on the power supply portion 90 is supplied to the power path 80.

[0032] The power path 80 and the branch paths 81A, 81B, 81C, 81D are composed of electric wires and have inductance components. The power path 80 is a path through which electric power is supplied from the power supply portion 90. The power supply portion 90 is electrically connected to the power path 80. The branch paths 81A, 81B, 81C, 81D are paths branched from the power path 80. Each of the branch paths 81A, 81B, 81C, 81D is electrically connected to each of the loads 91A, 91B, 91C, 91D.

[0033] The loads 91A, 91B, 91C, 91D are, for example, low-voltage loads, specifically, an electric power steering system, an electric parking brake, lighting, a wiper drive portion, a navigation device, a millimeter wave radar, a stereoscopic camera, and the like, a sensing system, a speed control system, an inter-vehicle control system, and the like, and a system for automatic driving. Each of the branch paths 81A, 81B, 81C, 81D is electrically connected to each of the loads 91A, 91B, 91C, 91D.

[0034] The in-vehicle control device 1 is a device suitable for the in-vehicle system 100. The in-vehicle control device 1 includes a plurality of relays 10A, 10B, 10C, 10D, a plurality of current detection portions 11A, 11B, 11C, 11D, and a control portion 13.

[0035] Each of the relays 10A, 10B, 10C, 10D is provided in each of the branch paths 81A, 81B, 81C, 81D. Each of the relays 10A, 10B, 10C, 10D is switched between an allowed state that allows energization of each of the branch paths 81A, 81B, 81C, 81D and a cut-off state that cuts off the energization of each of the branch paths 81A, 81B, 81C, 81D. The relays 10A, 10B, 10C, 10D can be semiconductor relays such as MOSFETs or mechanical relays. The relays 10A, 10B, 10C, 10D are in the allowed state in the on state and are in the cut-off state in the off state. The cut-off state can be at least a state that cuts off the energization from the power supply section 90 side to the load 91A, 91B, 91C, 91D side. In the present embodiment, the cut-off state is a state that cuts off the energization in both directions, that is, a state that cuts off the energization from the power supply section 90 side to the load 91A, 91B, 91C, 91D side and cuts off the energization from the load 91A, 91B, 91C, 91D side to the power supply section 90 side.

[0036] The current detection sections 11A, 11B, 11C, 11D are, for example, known current detection circuits and are provided in the branch paths 81A, 81B, 81C, 81D. The current detection sections 11A, 11B, 11C, 11D are provided on the load 91A, 91B, 91C, 91D side than the relays 10A, 10B, 10C, 10D. Each of the current detection sections 11A, 11B, 11C, 11D is, for example, composed of a shunt resistor provided in the branch path 81A, 81B, 81C, 81D and a differential amplifier that amplifies the voltage across the shunt resistor and outputs the amplified voltage. Each of the current detection sections 11A, 11B, 11C, 11D detects the value of each current flowing through the corresponding branch path 81A, 81B, 81C, 81D and outputs a current value signal that represents the detected value of the current. The current value signal is input to the control section 13.

[0037] The voltage detection section 12 is, for example, a known voltage detection circuit and has a function of being able to detect the voltage of the power path 80. The voltage detection section 12 detects the voltage of the power path 80 by detecting the voltage at a position electrically connected to the power path 80 in the present embodiment, but can detect the voltage of the power path 80 itself. The voltage detection section 12 outputs a voltage value signal that represents the voltage value of the power path 80 (for example, a signal that represents the voltage value of the power path 80 or a value obtained by dividing the voltage value of the power path 80 by a voltage dividing circuit, and the like). The voltage value signal is input to the control section 13.

[0038] The control section 13 is configured to have a microcomputer, and has a CPU, a ROM, a RAM, and the like. The current value signal and the voltage value signal are input to the control section 13. The control section 13 can control the operation of the relays 10A, 10B, 10C, and 10D.

[0039] When the control section 13 detects a predetermined abnormal state, the control section 13 switches the relay provided in the specific branch passage, which is the branch passage 81A, 81B, 81C, or 81D having the largest rising speed of the current value among the plurality of branch passages 81A, 81B, 81C, and 81D, to the off state, on the basis of the detection results of the current detection sections 11A, 11B, 11C, and 11D. The "abnormal state" is, for example, a state in which the voltage value or the current value of the power passage 80 or the branch passages 81A, 81B, 81C, and 81D reaches a predetermined level. More specifically, the "abnormal state" is a state in which the voltage detected by the voltage detection section 12 decreases below a threshold voltage. That is, the control section 13 switches the relay provided in the specific branch passage to the off state when the voltage detected by the voltage detection section 12 decreases below the threshold voltage. More specifically, the control section 13 takes the branch passage in which the value obtained by time-differentiating the current value is the largest as the specific branch passage, and switches the relay provided in the specific branch passage to the off state.

[0040] The threshold voltage is a value larger than 0 V. The threshold voltage is, for example, a value smaller than the output voltage of the storage battery when the storage battery is fully charged in the case where the power supply section 90 is a storage battery, and is a value smaller than the target voltage of the DCDC converter in the case where the power supply section 90 is a DCDC converter.

[0041] The control section 13 can determine the threshold value (in the present embodiment, the threshold voltage) for determining the abnormal state based on the power supply condition from the power supply section 90. The "power supply condition from the power supply section 90" is, for example, whether the vehicle is running, the amount of power supplied from the power supply section 90, the value of the current flowing from the power supply section 90 to the load 91A, 91B, 91C, 91D side, the number of loads to which power is supplied from the power supply section 90, the kind of loads to which power is supplied from the power supply section 90, whether the start switch is in the on state or the off state, and the like. The control section 13 determines, for example, a relatively large threshold voltage in the case where the vehicle is running, and a relatively small threshold voltage in the case where the vehicle is not running. Whether the vehicle is running is determined, for example, based on the vehicle speed. The determination of whether the vehicle is running can be made by the control section 13, or by an external ECU. Also, as another example, the control section 13 can determine a larger threshold voltage in the case where the amount of power supplied from the power supply section 90 is relatively large, and a smaller threshold voltage in the case where it is relatively small. As a specific determination method, for example, a function having the amount of power supplied and the threshold voltage as variables can be stored in advance, and the threshold voltage can be determined based on the function and the amount of power supplied. Alternatively, a table in which the amount of power supplied and the threshold voltage are associated with each other can be stored in advance, and the threshold voltage can be determined based on the table and the amount of power supplied. Further, the calculation of the amount of power supplied can be made by the control section 13, or by an external ECU.

[0042] The control section 13 has a determination circuit 21, a plurality of differentiation circuits 22A, 22B, 22C, 22D, a selection circuit 23, a cutoff circuit 24, and a threshold determination circuit 25. The determination circuit 21 is a circuit that outputs an abnormality signal in the case where an abnormal state occurs. The determination circuit 21 is input with a voltage value signal. The determination circuit 21 determines whether an abnormal state occurs based on the voltage value signal. Specifically, the determination circuit 21 determines that an abnormal state does not occur in the case where the voltage detected by the voltage detection section 12 is greater than the threshold voltage, and determines that an abnormal state occurs in the case where the voltage detected by the voltage detection section 12 decreases to be equal to or less than the threshold voltage.

[0043] The differential circuits 22A, 22B, 22C, 22D are circuits that time-differentiate the current values detected by the current detection sections 11A, 11B, 11C, 11D, respectively, for the respective branch paths 81A, 81B, 81C, 81D. The current value signals output from the respective current detection sections 11A, 11B, 11C, 11D are input to the respective differential circuits 22A, 22B, 22C, 22D. The respective differential circuits 22A, 22B, 22C, 22D time-differentiate the current values detected by the current detection sections 11A, 11B, 11C, 11D, respectively, on the basis of the input current value signals. The respective differential circuits 22A, 22B, 22C, 22D output the calculation results.

[0044] The selection circuit 23 is a circuit that outputs a selection signal indicating the branch path that generates the maximum differential value among the differential values obtained by time-differentiating the current values, on the basis of the calculation results of the respective differential circuits 22A, 22B, 22C, 22D. The calculation results of the respective differential circuits 22A, 22B, 22C, 22D are input to the selection circuit 23. The selection circuit 23 has a plurality of input terminals 23A, 23B, 23C, 23D. The calculation results of the respective differential circuits 22A, 22B, 22C, 22D are input to the respective input terminals 23A, 23B, 23C, 23D. The selection circuit 23 determines the branch path that generates the maximum differential value on the basis of the input calculation results, and outputs a selection signal indicating the determined branch path. The selection circuit 23 continuously outputs the selection signal indicating the branch path 81A. The selection circuit 23 switches to the selection signal indicating the changed branch path in the case where the branch path that generates the maximum differential value changes.

[0045] The cutoff circuit 24 is a circuit that switches the relay set for the branch path indicated by the selection signal to the cutoff state in the case where an abnormal signal is input. The abnormal signal and the selection signal are input to the cutoff circuit 24. The abnormal signal is input from the determination circuit 21 to the cutoff circuit 24 in the case where an abnormal state occurs. The selection signal is continuously input from the selection circuit 23 to the cutoff circuit 24. The cutoff circuit 24 switches the relay set for the branch path indicated by the selection signal to the cutoff state on the basis of the selection signal input when the abnormal signal is input.

[0046] The threshold decision circuit 25 is a circuit that decides the threshold value (threshold voltage in the present embodiment) for determining the abnormal state on the basis of the power supply condition from the power supply section 90. The threshold decision circuit 25 outputs the decided threshold voltage. The determination circuit 21 described above determines the presence or absence of an abnormal state on the basis of the threshold voltage decided by the threshold decision circuit 25.

[0047] The following description relates to the operation of the control section 13.

[0048] In Figure 1 In the example shown, the relays 10A, 10B, 10C, 10D are all in the permitted state. Electric power from the power supply section 90 is supplied to each of the loads 91A, 91B, 91C, 91D. The voltage detected by the voltage detection section 12 is a value greater than the threshold voltage. Therefore, the determination circuit 21 does not detect an abnormal state, and does not output an abnormal signal. Therefore, the cutoff circuit 24 does not switch one of the relays 10A, 10B, 10C, 10D to the cutoff state.

[0049] Thereafter, as Figure 2 shown, when an abnormality such as a ground occurs in the branch passage 81A, the voltage of the power passage 80 and the branch passages 81A, 81B, 81C, 81D decreases. As a result, when the determination circuit 21 detects an abnormal state, an abnormal signal is input from the determination circuit 21 to the cutoff circuit 24.

[0050] On the other hand, the value of the current flowing through the power passage 80 and the branch passages 81A, 81B, 81C, 81D increases. Since the power passage 80 and the branch passages 81A, 81B, 81C, 81D have inductance components, the rate of increase of the current value tends to increase the closer to the location where the abnormality occurs, and tends to decrease the farther from the location where the abnormality occurs. Therefore, it can be considered that the abnormality is more likely to occur in a certain branch passage in which the rate of increase of the current value is the greatest. In other words, it can be considered that the abnormality is more likely to occur in a branch passage in which the greatest differential value among differential values obtained by time-differentiating each current value is generated.

[0051] Each of the differential circuits 22A, 22B, 22C, 22D time-differentiates each current value detected by the current detection sections 11A, 11B, 11C, 11D based on the input current value signal, and outputs the calculation result. Since the abnormality occurs in the branch passage 81A, the value obtained by time-differentiating the current value of the branch passage 81A, that is, the calculation result (differential value) of the differential circuit 22A, reaches the maximum. Therefore, the selection circuit 23 determines the branch passage 81A as the branch passage in which the greatest differential value is generated, based on the calculation results input from each of the differential circuits 22A, 22B, 22C, 22D. Then, the selection circuit 23 outputs a selection signal indicating the branch passage 81A. The cutoff circuit 24 switches the relay 10A provided in the branch passage 81A to the cutoff state when the abnormal signal and the selection signal indicating the branch passage 81A are input. Thus, it is possible to immediately separate the branch passage 81A in which the abnormality occurs from the power passage 80 and the other branch passages 81B, 81C, 81D.

[0052] The following description relates to the effects of the first embodiment.

[0053] The in-vehicle control device 1 of the first embodiment is a device that is applied to the in-vehicle system 100. The in-vehicle system has a power supply section 90, a power path 80 that is a path through which power is supplied from the power supply section 90, and a plurality of branch paths 81A, 81B, 81C, 81D that are paths branched from the power path 80. The in-vehicle control device 1 has a plurality of relays 10A, 10B, 10C, 10D, a control section 13, and a plurality of current detection sections 11A, 11B, 11C, 11D. The control section 13 controls the plurality of relays 10A, 10B, 10C, 10D. The plurality of current detection sections 11A, 11B, 11C, 11D detect values of currents that flow through the respective branch paths 81A, 81B, 81C, 81D. Each of the relays 10A, 10B, 10C, 10D is switched between an allowed state in which energization of the respective branch paths 81A, 81B, 81C, 81D is allowed and a cutoff state in which the energization of the respective branch paths 81A, 81B, 81C, 81D is cut off. The control section 13, in a case where a predetermined abnormal state is detected, switches the relay 10A, 10B, 10C, 10D provided at a specific branch path, which is a branch path among the plurality of branch paths 81A, 81B, 81C, 81D in which a rising speed of a current value is the largest, to the cutoff state, on the basis of a detection result of the current detection section 11A, 11B, 11C, 11D.

[0054] According to this structure, in a case where an abnormal state is detected, it is possible to cut off the energization of the specific branch path in which the rising speed of the current value is the largest. Therefore, it is possible to immediately separate the specific branch path in which the possibility of a rapid rise in current is high (the branch path 81A in the example shown in FIG. 1) from the other branch paths. Figure 2

[0055] Further, the in-vehicle control device 1 has a voltage detection section 12 that detects a voltage of the power path 80 or the branch paths 81A, 81B, 81C, 81D. The control section 13, in a case where the voltage detected by the voltage detection section 12 is reduced to be lower than a threshold voltage, switches the relay 10A, 10B, 10C, 10D provided at the specific branch path to the cutoff state.

[0056] According to this structure, in a case where a ground fault occurs on one of the branch paths, it is possible to immediately separate the branch path in which the possibility of the occurrence of the ground fault is high from the other branch paths.

[0057] Further, the voltage detection section 12 detects the voltage of the power path 80.

[0058] According to this structure, even in a case where an open circuit occurs on one of the branch paths, it is possible to detect the voltage of the branch path in which the open circuit does not occur. ​

[0059] Further, the control section 13 takes the branch passage in which the value obtained by time-differentiating the current value is the largest as the specific branch passage, and switches the relays 10A, 10B, 10C, 10D provided in the specific branch passage to the off state.

[0060] According to this structure, the specific branch passage in which the rising speed of the current value is the fastest can be determined by comparing the values obtained by time-differentiating the current value, and the relays provided in the specific branch passage can be switched to the off state.

[0061] Further, the control section 13 has a determination circuit 21, a plurality of differential circuits 22A, 22B, 22C, 22D, a selection circuit 23, and an off circuit 24. The determination circuit 21 outputs an abnormality signal in the case where an abnormal state occurs. The differential circuits 22A, 22B, 22C, 22D time-differentiate the respective current values detected by the current detection sections 11A, 11B, 11C, 11D of the respective branch passages 81A, 81B, 81C, 81D. The selection circuit 23 outputs a selection signal based on the calculation results of the respective differential circuits 22A, 22B, 22C, 22D, the selection signal indicating the branch passage 81A, 81B, 81C, 81D in which the largest differential value among the respective differential values obtained by time-differentiating the respective current values is generated. The off circuit 24 switches the relays provided in the branch passage indicated by the selection signal to the off state in the case where the abnormality signal is input.

[0062] According to this structure, the process of determining the specific branch passage and switching the relays to the off state is simplified, and thus the relays provided in the specific branch passage can be switched to the off state more quickly in the case where an abnormal state occurs.

[0063] Further, the control section 13 decides the threshold value for determining an abnormal state based on the power supply condition from the power supply section 90.

[0064] According to this structure, the threshold value for determining an abnormal state is decided based on the power supply condition from the power supply section 90, and thus the false determination of an abnormal state can be suppressed.

[0065] <Other Embodiments>

[0066] The present disclosure is not limited to the embodiments described above and illustrated in the drawings. For example, the features of the above-described or hereinafter-described embodiments can be combined in all possible combinations as long as they are not contradictory. In addition, a certain feature of the above-described or hereinafter-described embodiments can be omitted as long as it is not explicitly stated as a necessary structure. Further, the above-described embodiments can be changed as described below.

[0067] In the above-described first embodiment, the voltage detection section detects the voltage of the power passage, but the voltage detection section can detect the voltage of the branch passage.

[0068] In the above-described first embodiment, the "abnormal state (a state in which the voltage value or the current value of the power passage or the branch passage reaches a predetermined level)" is a "state in which the voltage detected by the voltage detection section falls below the threshold voltage", but the "abnormal state" can be another state. For example, the "abnormal state" can be a "state in which the value of the current detected by one of the plurality of current detection sections rises above a threshold current". Alternatively, the "abnormal state" can be a "state in which the rising speed (derivative value) of the current value of one of the plurality of branch passages rises above a threshold speed".

[0069] In the above-described first embodiment, the "rising speed of the current value" is determined by a "value obtained by time-differentiating the current value", but the "rising speed of the current value" can be determined in another method. For example, the "rising speed of the current value" can be determined by a "difference (change amount) in the current value per unit time".

[0070] In the above-described first embodiment, the control section determines the threshold value, but a predetermined fixed value can be used as the threshold value. In this case, the in-vehicle control device can not have a threshold value determination circuit.

[0071] A current detection section that detects the value of the current flowing through the power passage can be provided as needed.

[0072] Furthermore, it should be considered that the embodiments disclosed herein are illustrative in all respects, rather than restrictive. The scope of the present application is not limited to the embodiments disclosed herein, and is intended to encompass all modifications within the scope of the claims or equivalent scope of the claims.

[0073] Explanation of Reference Numerals

[0074] 1: In-vehicle control device

[0075] 10A: Relay

[0076] 10B: Relay

[0077] 10C: Relay

[0078] 10D: Relay

[0079] 11A: Current detection section

[0080] 11B: Current detection section

[0081] 11C: Current detection section

[0082] 11D: Current detection section

[0083] 12: Voltage detection section

[0084] 13: Control section

[0085] 21: Determination circuit

[0086] 22A: Differentiation circuit

[0087] 22B: Differentiation circuit

[0088] 22C: Differentiation circuit

[0089] 22D: Differentiation circuit

[0090] 23: Selection circuit

[0091] 23A: Input terminal

[0092] 23B: Input terminal

[0093] 23C: Input terminal

[0094] 23D: Input terminal

[0095] 24: Shutoff circuit

[0096] 25: Threshold determination circuit

[0097] 80: Power path

[0098] 81A: Branch path

[0099] 81B: Branch path

[0100] 81C: Branch path

[0101] 81D: Branch path

[0102] 90: Power supply section

[0103] 91A: Load

[0104] 91B: Load

[0105] 91C: Load

[0106] 91D: Load

[0107] 100: Vehicle-mounted system

Claims

1. A control device for a vehicle, adapted for a vehicle system having a power supply section, a power path through which electric power is supplied from the power supply section, and a plurality of branch paths branched from the power path, wherein the control device for a vehicle comprises: a plurality of relays; a control section that controls the plurality of relays; and a current detection section that detects a value of each current flowing through each of the branch paths, each of the relays is switched between an allowable state in which electric conduction of each of the branch paths is allowed and a cutoff state in which electric conduction of each of the branch paths is cut off, the control section switches the relay provided in a specific branch path, which is a branch path having a largest rate of increase in the value of the current among the plurality of branch paths, to the cutoff state based on a detection result of the current detection section in a case where a predetermined abnormal state is detected, and the control section switches the relay provided in the specific branch path to the cutoff state, and the control section has: a determination circuit that outputs an abnormality signal in a case where the abnormal state occurs; a differentiation circuit that time-differentiates each of the values of the currents detected by the current detection section with respect to each of the branch paths; a selection circuit that outputs a selection signal indicating the branch path in which a maximum differential value among differential values obtained by time-differentiating each of the values of the currents is generated, based on a calculation result of each of the differentiation circuits; and a cutoff circuit that switches the relay provided in the branch path indicated by the selection signal to the cutoff state in a case where the abnormality signal is input.

2. The control device for a vehicle according to claim 1, wherein the control device for a vehicle comprises a voltage detection section that detects a voltage of the power path or the branch path, and the control section switches the relay provided in the specific branch path to the cutoff state in a case where the voltage detected by the voltage detection section is reduced to a threshold voltage or less.

3. The control device for a vehicle according to claim 2, wherein the voltage detection section detects a voltage of the power path.

4. The control device for a vehicle according to any one of claims 1 to 3, wherein the control section decides a threshold for determining the abnormal state based on a power supply condition from the power supply section. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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