In-vehicle power control system, control device, and summary control device

Abstract

The present invention suppresses the influence of a power supply voltage drop caused by a reduction in the diameter of an electric wire of a wire harness, and appropriately ensures the operation guarantee voltage of members (501-503) connected to the wire harness. An in-vehicle power control system (1) is provided with a low-voltage battery (50), a first control device (100), and components (501-503). The first control device (100) acquires the wiring resistance values of the power supply lines of the third power supply line (60), the fourth power supply line (80), and the fifth power supply line (90), acquires the current values supplied to the components (501-503), and calculates the amount of voltage drop in the power supply lines on the basis of the acquired wiring resistance values and current values. Then, on the basis of the calculated voltage drop amount, a correction value for correcting the output voltage of the DCDC converter (30) is determined, and a correction request indicating the determined correction value is transmitted to the second control device (200).

Description

Technical Field

[0001] The present disclosure relates to an on-vehicle power control system, and a control device and a centralized control device mounted in the on-vehicle power control system. Background Art

[0002] In the past, in order to prevent overheating caused by overcurrent, electrical and electronic devices used fuses that melted using the Joule heat of the current. Fuses that cut off the current by melting due to such heat require time to replace the fuse after melting. In addition, it is necessary to consider the deviation of the fuse's fusing characteristics and pre-select a thick wire harness (conductor). Therefore, the use of fuses has become the main reason for the increase in the weight and cost of the wire harness.

[0003] Therefore, in recent years, the following method has been used to implement the overheat protection function of the conventional wiring harness using a semiconductor switch using power semiconductors and a temperature estimation technology for the wiring harness. This method detects the current value flowing through the wiring harness, estimates the temperature rise of the wiring harness by calculation using the current value, and cuts off the semiconductor switch to protect the wiring harness.

[0004] In overheat protection using this semiconductor switch, if the overcurrent is eliminated, the semiconductor switch can be turned on to restore the power supply, so there is no need to replace components such as fuses. In addition, since there is no need to consider the deviation of the fusing characteristics as with conventional fuses, thinner wire harnesses can be used than before, which can reduce weight and cost.

[0005] Patent Document 1 describes an overheat protection technology using semiconductor switches and temperature estimation of wiring harnesses. Patent Document 1 states that "the current is detected at predetermined intervals, the current wire temperature is estimated using the current, and the current wire temperature is compared with the allowable upper limit temperature of the wire. Even when the wire temperature rises due to repeated on / off short-circuit current, detection can be performed reliably, and the current is cut off before the wire reaches the smoking temperature, thereby preventing the wire from smoking." Prior art literature Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-130944 Summary of the invention Problem that the invention aims to solve

[0007] However, if the diameter of the electric wires in the wire harness is reduced using the technique described in Patent Document 1, the wiring resistance value of the wire harness increases, and the voltage drop amount of the wire harness increases.

[0008] For example, in a wiring harness connecting a power supply device and a load such as a control device, the voltage drop in the wiring harness increases due to the reduction in the diameter of the wires in the wiring harness, thereby reducing the power supply voltage supplied to the load. As a result, the power supply voltage supplied to the load may be lower than the operation guarantee voltage required to ensure the performance of the load.

[0009] That is, if the technology described in the above-mentioned Patent Document 1 is used to reduce the diameter of the wires in the wire harness, the weight of the wires can be reduced, but there is a problem that the performance of the load such as the control device cannot be guaranteed, resulting in the redesign of the load, which has a great impact on the vehicle system.

[0010] The present disclosure has been made to solve such a technical problem, and an object thereof is to suppress the influence of a power supply voltage drop caused by a reduction in the diameter of electric wires in a wiring harness and to appropriately ensure an operation guarantee voltage for a load connected to the wiring harness. Technical means of solving problems

[0011] The vehicle-mounted power control system disclosed in the present invention comprises: a power supply device, a control device connected to the power supply device via a first power line, and one or more loads connected to the control device via a second power line, wherein the control device comprises: a wiring resistance acquisition unit, which acquires wiring resistance values ​​of the first power line and the second power line; a current acquisition unit, which acquires a first current value supplied to the control device via the first power line and a second current value supplied to the load via the second power line; a voltage drop amount calculation unit, which calculates the voltage drop amount in the first power line and the second power line based on the wiring resistance value acquired by the wiring resistance acquisition unit, the first current value acquired by the current acquisition unit, and the second current value acquired by the current acquisition unit; a correction value determination unit, which determines a correction value for correcting the output voltage of the power supply device based on the voltage drop amount calculated by the voltage drop amount calculation unit; and a correction request output unit, which outputs a correction request representing the correction value determined by the correction value determination unit.

[0012] In addition, the control device disclosed in the present invention is a control device of a vehicle-mounted power control system that is connected to a power supply device via a first power line and to one or more loads via a second power line, and comprises: a wiring resistance acquisition unit that acquires wiring resistance values ​​of the first power line and the second power line; a current acquisition unit that acquires a first current supplied to the control device via the first power line and a second current supplied to the load via the second power line; a voltage drop calculation unit that calculates the voltage drop in the first power line and the second power line based on the wiring resistance value acquired by the wiring resistance acquisition unit, the first current acquired by the current acquisition unit, and the second current acquired by the current acquisition unit; a correction value determination unit that determines a correction value for correcting the output voltage of the power supply device based on the voltage drop calculated by the voltage drop calculation unit; and a correction request output unit that outputs a correction request representing the correction value determined by the correction value determination unit.

[0013] In addition, the summary control device of the present disclosure is a summary control device that is communicatively connected to the above-mentioned multiple control devices, and outputs a correction request selected from multiple correction requests to a power supply voltage control device that controls the output voltage of the power supply device, and multiple correction requests are output from each correction request output unit of the multiple control devices. Effects of the Invention

[0014] According to the present disclosure, the influence of a drop in power supply voltage due to reduction in diameter of electric wires in a wiring harness can be suppressed, and an operation guarantee voltage of a device connected to the wiring harness can be appropriately ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A This is a basic configuration diagram of the vehicle-mounted power control system 1 according to the first embodiment. Figure 1B It is a diagram showing the internal structure of the first control device 100 according to the first embodiment. Figure 1C This is a control flowchart of the first control device 100 according to the first embodiment. Figure 2A This is a basic configuration diagram of a vehicle-mounted power control system 2 according to the second embodiment. Figure 2B It is a diagram showing the internal structure of the third control device 300 according to the second embodiment. Figure 2C This is a diagram showing correction requests collected by the third control device 300 according to the second embodiment. Figure 2D It is a diagram showing storage data of a calibration request received by the third control device 300 according to the second embodiment. Figure 2E This is a control flowchart of the third control device in the second embodiment. Figure 3A This is a basic configuration diagram of the vehicle-mounted power control system 3 according to the third embodiment. Figure 3B It is a diagram showing the internal structure of the first control device 100A according to the third embodiment. Figure 4A This is a basic configuration diagram of a vehicle-mounted power control system 4 according to a fourth embodiment. Figure 4B It is a diagram showing the internal structure of a semiconductor switch 170 according to the fourth embodiment. Figure 4C It is a diagram showing the vehicle-mounted power control system 4 when the power line is disconnected according to the fourth embodiment. Figure 5A This is a diagram showing correction requests collected by the third control device 300 according to the fifth embodiment. Figure 5B This is a control flowchart of the third control device 300 in the fifth embodiment. Fig. 6A 1 is a timing chart showing the change in the output voltage of the DCDC converter 30 according to the sixth embodiment. Figure 6B This is a control flowchart of the third control device 300 in the sixth embodiment. Fig. 7A This is a diagram showing correction requests collected by the third control device 300 according to the seventh embodiment. Figure 7B This is a control flow chart of the third control device 300 in the seventh embodiment. Figure 7C It is a diagram showing storage data of a correction request received by the third control device 300 according to the seventh embodiment. DETAILED DESCRIPTION

[0016] The embodiments are described in detail using the accompanying drawings. However, the present invention is not limited to the description of the embodiments shown below. Those skilled in the art can easily understand that the specific configuration can be changed within the scope of the idea or purpose of the present invention. In the configuration of the invention described below, the same parts or parts having the same functions are denoted by the same reference numerals in different drawings, and duplicate descriptions are omitted. When there are a plurality of elements having the same or similar functions, different subscripts may be added to the same reference numerals for description. However, when there is no need to distinguish between the plurality of elements, the subscripts may be omitted for description. The expressions "first", "second", "third" and the like in this specification are added to identify the components and do not necessarily limit the number, order or content. In addition, the numbers used to identify the components are used according to the context, and the numbers used in one context do not necessarily represent the same components in other contexts. In addition, it does not prevent the components identified by a certain number from having the functions of the components identified by other numbers. In order to facilitate understanding of the invention, the position, size, shape, range, etc. of each component shown in the drawings and the like may not represent the actual position, size, shape, range, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings and the like. Publications, patents and patent applications cited in this specification directly constitute a part of this specification. In the present specification, components expressed in the singular shall include the plural form unless otherwise clearly indicated in the context.

[0017] Hereinafter, embodiments of a vehicle-mounted power control system according to the present invention will be described with reference to the drawings.

[0018] (First embodiment) Figure 1A 1 is a basic configuration diagram of a vehicle-mounted power control system 1 according to the first embodiment. The vehicle-mounted power control system 1 is an example of a vehicle control system mounted on a vehicle.

[0019] The vehicle-mounted power control system 1 is a system that supplies power supply voltage from a power supply device (a high voltage battery 10 or a low voltage battery 50) to various components 501 to 503 (loads). The components 501 to 503 are, for example, ECUs (Electronic Control Units), sensors, car navigation systems, lights, air conditioners, etc. The vehicle-mounted power control system 1 includes: a high voltage battery 10 (HV battery in the figure), a DCDC converter 30, a low voltage battery 50 (LV battery in the figure), a power distributor 70, a first control device 100, a second control device 200, components 501 to 503, and first power lines 20 to fifth power lines 90 connecting them.

[0020] The first power line 20 connects the high voltage battery 10 and the DCDC converter 30, the second power line 40 connects the DCDC converter 30 and the low voltage battery 50, the third power line 60 connects the low voltage battery 50 and the power distributor 70, the fourth power line 80 connects the power distributor 70 and the first control device 100, and the fifth power line 90 connects the first control device 100 and the components 501 to 503. At least one of the first power line 20 to the fifth power line 90 is a power line of a harness having a power line and a signal line.

[0021] The high voltage battery 10 is a main power source for the vehicle and is a large-capacity battery mainly used for driving the vehicle.

[0022] The low voltage battery 50 (power supply device) is mainly used as a power supply source for the above-mentioned components 501 to 503 mounted on the vehicle.

[0023] The DCDC converter 30 has a function of converting (stepping down) the DC voltage supplied from the high voltage battery 10 to the low voltage battery 50, and supplying electric power from the high voltage battery 10 to the low voltage battery 50. Furthermore, the DCDC converter 30 has a function of changing the output voltage output to the low voltage battery 50. The output voltage of the low voltage battery 50 depends on the output voltage of the DCDC converter 30.

[0024] The power distributor 70 is disposed between the low voltage battery 50 and the first control device 100, and is connected to the third power line 60 and the fourth power line 80. Figure 1A In the embodiment, the power distributor 70 supplies power to the first control device 100 , but the power distributor 70 may distribute the power to loads other than the first control device 100 .

[0025] The first control device 100 supplies the power supply voltage supplied from the power distributor 70 to one or more components 501 to 503 located downstream. The first control device 100 is connected to the low voltage battery 50 via the third power line 60 and the fourth power line 80. In addition, the plurality of components 501 to 503 are connected to the first control device 100 via the fifth power line 90. The first control device 100 will be described in detail later.

[0026] The second control device 200 (power supply voltage control device) monitors the output voltage of the low voltage battery 50 via the signal line 51, or collects vehicle information related to power generation from each component 501 to 503 on the vehicle (for example, the operation guarantee voltage of each component 501 to 503). The correction request receiving unit 210 of the second control device 200 receives the correction request sent from the first control device 100 via the signal line 101. In addition, the correction value indicating unit 211 of the second control device 200 issues an output voltage change instruction to the DCDC converter 30 via the signal line 201. The second control device 200 issues an output voltage change instruction to the DCDC converter 30 based on the correction value indicated by the received correction request. The communication connecting the first control device 100, the second control device 200, and the DCDC converter 30 is communicatively connected through a communication protocol adopted in the vehicle such as CAN (Controller Area Network), LIN (Local Interconnect Network), and Ethernet.

[0027] Below, refer to Figure 1BThe first control device 100 will be described in detail. Figure 1B It is a diagram showing the internal structure of the first control device 100 according to the first embodiment.

[0028] The first control device 100 includes a semiconductor switch 170 that supplies or cuts off a power supply voltage to the components 501 to 503 , and a microcomputer 180 that controls the semiconductor switch 170 .

[0029] The semiconductor switch 170 is composed of, for example, an IPD (Intelligent Power Device) or a semiconductor discrete component. The semiconductor switch 170 is connected to the fourth power line 80 connected to the power distributor 70 and the fifth power line 90 connected to the components 501 to 503, and supplies and cuts off the power supply voltage. In addition, the semiconductor switch 170 measures the current and voltage input to the semiconductor switch 170, and measures the current and voltage output from the semiconductor switch 170. In addition, the semiconductor switch 170 has functions such as fault diagnosis and self-diagnosis.

[0030] The semiconductor switch 170 includes a switch SW1 connected to the fourth power line 80, a switch SW2 connected to the power line 90-1 of the fifth power line 90, a switch SW3 connected to the power line 90-2, and a switch SW4 connected to the power line 90-3. These switches SW1 to SW4 are semiconductor switches such as MOSFETs. The semiconductor switch 170 measures the current and voltage supplied to the fourth power line 80. In addition, the semiconductor switch 170 measures the current and voltage supplied to each of the power lines 90-1 to 90-3 of the fifth power line 90. The measured current value and voltage value are sent to the microcomputer 180.

[0031] The microcomputer 180 is an information processing device having a CPU (Central Processing Unit) or a memory, etc., and has functions such as a wiring resistance acquisition unit 110 (wiring resistance acquisition unit), a current acquisition unit 120 (current acquisition unit), a voltage drop amount calculation unit 130 (voltage drop amount calculation unit), a component information unit 135, a correction value determination unit 140 (correction value determination unit), and a correction request transmission unit 150 (correction request output unit). In addition, the microcomputer 180 has functions such as performing various fault diagnoses and self-diagnoses. The description of each part is described later.

[0032] For example Figure 1BAs shown, the wiring resistance acquisition unit 110 has information such as the wiring resistance value (reference wiring resistance value) from the low voltage battery 50 to the components 501 to 503 and the switch resistance value of the semiconductor switch 170. Specifically, the wiring resistance acquisition unit 110 has: the wiring resistance value (upstream) from the low voltage battery 50 to the first control device 100, and the wiring resistance value (downstream) from the first control device 100 to the components 501 to 503. For example, the wiring resistance value (upstream) is the combined resistance value of the third power line 60 and the fourth power line 80, and the wiring resistance value (downstream) is the resistance value of each power line 90-1 to 90-3 of the fifth power line 90, but the wiring resistance value is not limited to this, for example, it can include the switch resistance value, the contact resistance value of the connector, etc. In addition, the information possessed by the wiring resistance acquisition unit 110 is the information written into the microcomputer 180 when the first control device 100 is manufactured in advance, or the information written into the microcomputer 180 after the first control device 100 is mounted on the vehicle. Furthermore, the information held by the wiring resistance acquisition unit 110 may be updated as appropriate.

[0033] Furthermore, the wiring resistance acquisition unit 110 also has a function of calculating the temperature estimation value of the wiring harness (the fourth power line 80, the fifth power line 90 (power lines 90-1 to 90-3)) based on the current value and the power-on time measured by the semiconductor switch 170, and considering the change of the wiring resistance value based on the calculated temperature estimation value in the above wiring resistance value. By considering the change of the wiring resistance value caused by the temperature change, the voltage drop from the low voltage battery 50 to the components 501 to 503 can be calculated with high accuracy. In addition, in the present embodiment, the function of considering the change of the wiring resistance value caused by the temperature change is configured on the microcomputer 180, but it can also be configured outside the microcomputer 180.

[0034] The current acquisition unit 120 acquires each current value measured by the semiconductor switch 170. Specifically, the current acquisition unit 120 acquires each current value supplied from the low voltage battery 50 to the first control device 100 (upstream) and each current value supplied from the first control device 100 to the components 501 to 503 (downstream).

[0035] The voltage drop calculation unit 130 calculates the voltage drop from the low voltage battery 50 to the components 501 to 503 based on the wiring resistance value (upstream, downstream) acquired from the wiring resistance acquisition unit 110 and the current value (upstream, downstream) acquired from the current acquisition unit 120 .

[0036] The component information unit 135 stores information on the operation guaranteed voltages of the components 501 to 503 connected to the first control device 100. The information stored in the component information unit 135 is information written into the microcomputer 180 when the first control device 100 is manufactured in advance, or information written into the microcomputer 180 after the first control device 100 is mounted on the vehicle. The information stored in the component information unit 135 can be updated as appropriate.

[0037] The correction value determination unit 140 calculates the correction value of the power supply voltage based on the voltage drop amount from the low voltage battery 50 to the components 501 to 503 calculated by the voltage drop amount calculation unit 130 and the operation guarantee voltage stored in the component information unit 135. Specifically, the correction value determination unit 140 compares the power supply voltage value supplied by the semiconductor switch 170 with the voltage drop amount from the low voltage battery 50 to the components 501 to 503 calculated by the voltage drop amount calculation unit 130 and the operation guarantee voltage stored in the component information unit 135, calculates the minimum power supply voltage required for the components 501 to 503, and calculates the correction value of the power supply voltage.

[0038] The correction request transmission unit 150 transmits a correction request indicating the correction value of the power supply voltage calculated by the correction value determination unit 140 to the second control device 200 .

[0039] Below, refer to Figure 1C , describing the method for correcting the power supply voltage of this embodiment. Figure 1C This is a control flowchart of the first control device 100 according to the first embodiment. Figure 1C Each step of the flowchart is performed by the processor of the microcomputer 180 executing the program expanded in the memory. Figure 1C The flowchart shown is executed at regular or variable time intervals after the startup process and initialization process of the first control device 100 are completed.

[0040] First, in step S110 , the microcomputer 180 acquires reference wiring resistance values ​​(upstream, downstream) that do not take temperature changes from the low voltage battery 50 to the components 501 to 503 into consideration.

[0041] Next, in step S120 , the microcomputer 180 acquires the current value (upstream, downstream) and the energization time measured by the semiconductor switch 170 .

[0042] In step S130, the microcomputer 180 estimates the temperature rise value in the wiring harness (third power line 60, fourth power line 80 and fifth power line 90) based on the reference wiring resistance value (upstream, downstream), current value (upstream, downstream) and energization time.

[0043] In step S140, the microcomputer 180 obtains the wiring resistance values (upstream and downstream) accompanying the temperature change based on the above-mentioned reference wiring resistance values (upstream and downstream) and the temperature rise value.

[0044] In step S150, the microcomputer 180 calculates the voltage drop amounts (upstream and downstream) from the low-voltage battery 50 to the components 501 to 503 based on the above-mentioned current values (upstream and downstream) and the wiring resistance values (upstream and downstream) accompanying the temperature change. Hereinafter, an example of the arithmetic expressions is shown in Expressions (1) and (2). Here, with the semiconductor switch 170 as the reference, the microcomputer 180 calculates the voltage drop amount (upstream) from the low-voltage battery 50 to the semiconductor switch 170 using Expression (1), and calculates the respective voltage drop amounts (downstream) from the semiconductor switch 170 to the components 501 to 503 using Expression (2). Additionally, in the Figure 1A example, since three components 501 to 503 are connected to the semiconductor switch 170, Expression (2) is used to calculate three voltage drop amounts (downstream), and the maximum voltage drop amount is taken as the voltage drop amount (downstream).

[0045] Voltage drop amount (upstream) Vf_ba = Current value (upstream) × Wiring resistance value (upstream) … Expression (1) Voltage drop amount (downstream) Vf_ac = Current value (downstream) × Wiring resistance value (downstream) … Expression (2)

[0046] In step S160, the microcomputer 180 obtains the power supply voltage that serves as the reference for calculating the correction request.

[0047] In step S170, the microcomputer 180 calculates the correction value of the power supply voltage based on the power supply voltage serving as the above-mentioned reference, the voltage drop amount (upstream), the voltage drop amount (downstream), and the operation guarantee voltage obtained from the component information unit 135. The following Expressions (4) and (5) are executed when Vc_Pre < Vc_lowlimit to calculate the correction value of the power supply voltage.

[0048] Vc_pre = Va - Vf_ac … Expression (3) Vreq = Vc_lowlimit - Vc_pre … Expression (4) Vreq_total = Vf_ba + Vreq + Va … Expression (5) Here, the meanings of the respective symbols in Expressions (3) to (5) are as described below. Va: The power supply voltage value recognized by the first control device 100 Vc_pre: The power supply voltage value of the downstream components calculated by the first control device 100 Vc_lowlimit: The lower limit value of the operation guarantee voltage of the components 501 to 503 Vreq: relative value of power supply voltage correction required by components 501 to 503 Vreq_total: correction value of the correction request sent from the first control device 100 to the second control device 200

[0049] In step S180 , the microcomputer 180 transmits a correction request indicating the correction value of the power supply voltage calculated in step S170 to the correction request receiving unit 210 of the second control device 200 .

[0050] When receiving the correction request for the power supply voltage from the microcomputer 180 , the second control device 200 transmits a change instruction for changing the output voltage of the DCDC converter 30 to the DCDC converter 30 in accordance with the correction request.

[0051] (Effects of the First Embodiment) According to the vehicle-mounted power control system 1 of the present embodiment, the voltage drop amount in the third power line 60, the fourth power line 80, and the fifth power line 90 can be calculated based on the wiring resistance value (upstream, downstream) and the current value (upstream, downstream) from the low voltage battery 50 to the downstream components 501 to 503. In addition, the power supply voltage of the low voltage battery 50, the power supply voltage supplied to the components 501 to 503 calculated based on the calculated voltage drop amount, and the operation guarantee voltage value of the downstream components 501 to 503 can be compared in a timely manner. Therefore, when the power supply voltage supplied to the components 501 to 503 is lower than the operation guarantee voltage value, a correction value considering the voltage drop amount from the low voltage battery 50 to the components 501 to 503 can be calculated, and a correction request indicating the correction value can be sent to the DCDC converter 30. As a result, the operation guarantee voltage required by the components 501 to 503 can be ensured in a timely manner.

[0052] (Second embodiment) Below, refer to Figure 2A to Figure 2D The second embodiment will be described. Figure 2A This is a basic configuration diagram of a vehicle-mounted power control system 2 according to a second embodiment. The vehicle-mounted power control system 2 is an example of a vehicle control system to which the present invention is applied. The description of the contents overlapping with those of the first embodiment will be omitted.

[0053] In a configuration where a plurality of first control devices 100A to 100C are connected in parallel to one power distributor 70, the vehicle-mounted power control system 2 of this embodiment suppresses the complexity of power supply voltage correction caused by the increase or decrease of the first control devices 100A to 100C. The difference from the first embodiment described above is that the power supply voltage correction is considered based on the correction request sent from the plurality of first control devices 100A to 100C.

[0054] The plurality of first control devices 100A to 100C are regional ECUs, respectively, and are provided for each region of the vehicle. The plurality of first control devices 100A to 100C are arranged in front of the vehicle, in the rear of the vehicle, and in the vehicle compartment, and have the function of supplying power supply voltage to components 501 to 503 arranged near each control device. Figure 2A In the embodiment, three first control devices 100A to 100C are connected, but the number of first control devices mounted may increase or decrease depending on the vehicle.

[0055] The third control device 300 (collective control device) receives the correction requests sent from the plurality of first control devices 100A to 100C, collects them, and sends them to the second control device 200. Since the third control device 300 collects the correction requests, the communication control of the second control device 200 with relatively low functions is not changed, and even if there are a plurality of first control devices 100A to 100C or the number of connected components 501 to 503 increases, the power supply voltage can be appropriately corrected.

[0056] The third control device 300 is an ECU for performing comprehensive control such as automatic driving of the vehicle, and is connected to the first control devices 100A to 100C via CAN or Ethernet communication, and communicates with the third control device 300 in a predetermined communication format. The third control device 300 has a communication circuit so that the number of connections to the first control devices 100A to 100C can be prepared in advance.

[0057] like Figure 2A As shown, a plurality of first control devices 100A to 100C are connected to the power distributor 70 via a fourth power line 80 .

[0058] Each of the first control devices 100A to 100C is connected to one or more components 501 to 503 via the fifth power line 90. Each of the first control devices 100A to 100C calculates a correction value of the power supply voltage and transmits a correction request to the third control device 300 via the signal line 102.

[0059] The third control device 300 transmits a correction request selected from a plurality of correction requests received from the plurality of first control devices 100A to 100C to the second control device 200 via the signal line 301. When receiving the selected correction request, the second control device 200 controls the output voltage of the DCDC converter 30 according to the correction request.

[0060] Figure 2B 1 is an internal configuration diagram of the third control device 300 according to the second embodiment. The third control device 300 includes a microcomputer 181. The microcomputer 181 includes a correction request receiving unit 305, a correction request collecting unit 310, and a correction request transmitting unit 150.

[0061] Figure 2C : is a diagram showing the correction requests collected by the third control device 300 of the second embodiment. Figure 2D FIG. 4 is a diagram showing stored data of a calibration request received by the third control device 300 of the second embodiment. Figure 2D As shown, third control device 300 receives and stores a correction request indicating 14.5V from first control device 100A, receives and stores a correction request indicating 14.7V from first control device 100B, and receives and stores a correction request indicating 14.6V from first control device 100C.

[0062] Then, if Figure 2C As shown in FIG. 1 , the third control device 300 selects a correction request having the highest voltage value from among the stored plurality of correction requests. Figure 2C In the example of , the third control device 300 selects the correction request (correction value: 14.7 V) received from the first control device 100B. Then, the third control device 300 transmits the selected correction request (correction value: 14.7 V) to the second control device 200 via the signal line 301 .

[0063] In addition, if Figure 2C As shown, the third control device 300 (warning unit) issues a warning as a precursor of a failure when the correction values ​​indicated by the received multiple correction requests are outside the prescribed range. As a warning method, a warning is displayed on a display device connected to the third control device 300 in a communicable manner, or a warning sound is emitted from a sound output device. The upper limit value of the prescribed range is the minimum value of the absolute maximum rating of one or more components 501 to 503, and the lower limit value of the prescribed range is the maximum value of the minimum guaranteed operating voltage of one or more components 501 to 503.

[0064] Below, refer to Figure 2E The voltage correction control process according to the present embodiment will be described. Figure 2E This is a control flowchart of the third control device 300 according to the second embodiment. Figure 2E The flowchart shown is executed at fixed or variable intervals after the startup process and initialization process of the third control device 300 are completed. The power supply voltage correction method executed by the first control devices 100A to 100C is the same as that of the first embodiment, so the description thereof is omitted.

[0065] First, in step S200 , the microcomputer 181 (correction request receiving unit 305 ) of the third control device 300 receives correction requests from the plurality of first control devices 100A to 100C.

[0066] In step S210 , the microcomputer 181 stores the received plurality of calibration requests in the memory of the microcomputer.

[0067] In step S220, the microcomputer 181 selects a correction request having a maximum correction value from among the plurality of correction requests stored in the memory.

[0068] In step S230, the microcomputer 181 sends a correction request to the second control device 200 in which the selected correction value is the maximum value. Figure 2C and Figure 2D In the example of , since the correction value of the correction request received from the first control device 100B is the maximum value, the microcomputer 181 transmits the correction request received from the first control device 100B to the second control device 200 .

[0069] (Effects of the Second Embodiment) According to the vehicle-mounted power control system 2 of the present embodiment, even in a system in which a plurality of first control devices 100A to 100C are connected, it is possible to obtain the same operational effects as those of the first embodiment described above.

[0070] Furthermore, by aggregating the correction requests sent from the plurality of first control devices 100A to 100C through the third control device 300, even when the number of first control devices 100A to 100C installed increases or decreases, there is no need to change the communication protocol between the second control device 200 and the third control device 300, and the second control device 200 shown in the first embodiment can be used as is.

[0071] Furthermore, the third control device 300 can supply a power supply voltage greater than the correction value of the correction request received from the first control devices 100A to 100C to the first control devices 100A to 100C by selecting the correction request with the maximum correction value. That is, the third control device 300 can shorten the time to determine the power supply voltage to be supplied and the time until the power supply is supplied by aggregating the correction requests.

[0072] (Third embodiment) Below, refer to Figure 3A and Figure 3B A third embodiment will be described. Figure 3A 1 is a basic configuration diagram of a vehicle-mounted power control system 3 according to a third embodiment. The vehicle-mounted power control system 3 is an example of a vehicle control system to which the present invention is applied. Explanations of contents overlapping with those of the above-mentioned embodiment will be omitted.

[0073] The vehicle-mounted power control system 3 of this embodiment is different from the second embodiment described above in that the first control device 100A collects the correction requests sent by the plurality of first control devices 100A to 100C. Therefore, the third control device 300 of the second embodiment is not required in this embodiment.

[0074] Specifically, the correction value is calculated in each of the plurality of first control devices 100A to 100C. The first control device 100A among the plurality of first control devices 100A to 100C receives a correction request from the other first control devices 100B and 100C via the signal line 102. In addition, the first control device 100A selects one of its own correction request and the received correction request, and transmits it to the second control device 200 via the signal line 301.

[0075] Figure 3B 1 is an internal configuration diagram of the first control device 100A of the third embodiment. Figure 1B Compared with the first control device 100 described in , the difference lies in having a correction request receiving unit 160 and a correction request collecting unit 165 .

[0076] The correction request sent by the first control device 100B and 100C and the correction request in the own device (the first control device 100A) are received by the correction request receiving unit 160 and sent to the correction request aggregating unit 165. The correction request aggregating unit 165 selects the correction request with the largest correction value from the plurality of correction requests and sends the selected correction request to the correction request sending unit 150. The correction request sending unit 150 sends the selected correction request to the second control device 200.

[0077] (Effects of the third embodiment) According to the vehicle-mounted power control system 3 of this embodiment, the same effects as those of the second embodiment can be obtained even in a system that does not have the third control device 300. In the third embodiment, compared with the second embodiment, the device configuration is simplified corresponding to not having the third control device 300, and cost reduction can be achieved.

[0078] (Fourth embodiment) Below, refer to FIG. 4A to FIG. 4B A fourth embodiment will be described. Figure 4A 4 is a basic configuration diagram of a vehicle-mounted power control system 4 according to a fourth embodiment. The vehicle-mounted power control system 4 is an example of a vehicle control system to which the present invention is applied. Explanations of contents overlapping with those of the above-mentioned embodiment will be omitted.

[0079] In the vehicle-mounted power control system 4 of the present embodiment, the power lines of the plurality of first control devices 100A to 100C are connected by a ring topology. Specifically, the power distributor 70 and the two first control devices 100A and 100C are connected by a fourth power line 80, the adjacent first control devices 100A and 100B are connected by a sixth power line 81, and the adjacent first control devices 100B and 100C are connected by a seventh power line 82. The other configurations are the same as those of the second embodiment.

[0080] The fourth power line 80 is divided into two systems from the power distributor 70 to form a redundant structure, so that even if a failure occurs in any one of the fourth power line 80, the sixth power line 81, and the seventh power line 82, the power supply voltage can be supplied from the power distributor 70 to each of the first control devices 100A to 100C via the other power line. As a result, the reliability of the vehicle-mounted power control system 4 can be improved.

[0081] Figure 4B 1 is an internal structure diagram of the semiconductor switch 170 of the fourth embodiment. The semiconductor switches 170 of the first control devices 100B and 100C are also configured in the same manner as the semiconductor switch 170 of the first control device 100A, so their description is omitted. The semiconductor switch 170 includes a semiconductor switch 171 connected to the fourth power line 80, a semiconductor switch 172 connected to the sixth power line 81, and a semiconductor switch group 173 connected to each of the components 501 to 503.

[0082] The semiconductor switch 171, the semiconductor switch 172, and the semiconductor switch group 173 are connected to each other via an internal power supply line 174. The semiconductor switch 171, the semiconductor switch 172, and the semiconductor switch group 173 are turned on and off by a control signal from a microcomputer.

[0083] The semiconductor switch group 173 is connected to the plurality of components 501 to 503 via the fifth power supply line 90. The power supply voltage supplied to the semiconductor switch 170 is supplied to the plurality of components 501 to 503 via the semiconductor switch group 173.

[0084] Next, use Figure 4C The effects of this embodiment will be described. Figure 4C It is a diagram showing the vehicle-mounted power control system 4 when the power line is disconnected according to the fourth embodiment.

[0085] When the fourth power line 80-1 is disconnected, the power supply voltage cannot be directly supplied to the first control device 100A from the power distributor 70. In this case, the power supply voltage cannot be supplied to the components 501 to 503 connected to the first control device 100A.

[0086] In this embodiment, since multiple first control devices 100A~100C are connected through a ring topology, the power supply voltage can be supplied to the first control device 100A from the power distributor 70 via the first power supply voltage supply path (the fourth power line 80-2, the first control device 100C, the seventh power line 82, the first control device 100B, and the sixth power line 81).

[0087] On the other hand, when the fourth power line 80 - 1 is not disconnected, the power supply voltage is supplied from the power distributor 70 to the first control device 100A via the second power supply voltage supply path (fourth power line 80 - 1 ).

[0088] Since the path of the power supply voltage when the fourth power line 80-1 is not disconnected is different from the path of the power supply voltage when the fourth power line 80-1 is disconnected, the voltage drop amount in the path also changes in normal and abnormal times. Therefore, when the fourth power line 80-1 is not disconnected, the first control device 100A calculates the correction value in consideration of the voltage drop amount in the third power line 60, the fourth power line 80-1, and the fifth power line 90, and sends a correction request. On the other hand, when the fourth power line 80-1 is disconnected, the first control device 100A calculates the correction value in consideration of the voltage drop amount in the third power line 60, the fourth power line 80-2, the seventh power line 82, the sixth power line 81, and the fifth power line 90, and sends a correction request.

[0089] In addition, even when the fourth power line 80-2, the sixth power line 81, or the seventh power line 82 is disconnected, the calculation method of the correction value is the same as that described above, and therefore the description thereof is omitted.

[0090] (Effects of the Fourth Embodiment) When the power supply voltage cannot be supplied from the power distributor 70 to the first control device 100A due to the disconnection of the fourth power supply line 80-1, the power supply voltage can be supplied to the first control device 100A and the components 501 to 503 via the detour power supply line connected by the ring topology. At this time, the first control device 100A calculates the correction value and sends the correction request in consideration of the voltage drop amount and switch resistance in the detour power supply line, thereby achieving the same effect as the first embodiment described above even when the power supply line is disconnected.

[0091] (Fifth embodiment) Next, refer to Figure 5A and Figure 5B A fifth embodiment will be described. Figure 5A The correction requests collected by the third control device 300 are shown.

[0092] The vehicle-mounted power control system of this embodiment considers that when the third control device 300 of the second embodiment selects a correction request from a plurality of correction requests, it is determined whether the correction value indicated by the received correction request is within a predetermined range.

[0093] Specifically, the upper limit and lower limit of the correction value of the plurality of correction requests are set. Since the correction request is used to control the output voltage of the DCDC converter 30, the upper limit becomes the maximum output voltage of the DCDC converter 30 or the minimum value of the absolute maximum ratings of the components 501 to 503 connected to the DCDC converter 30. Here, the maximum output voltage of the DCDC converter 30 is set to be lower than the minimum value of the absolute maximum ratings of the components 501 to 503 and not to exceed the absolute maximum ratings of the components 501 to 503.

[0094] Similar to the upper limit value, since the correction request is used to control the output voltage of the DCDC converter 30, the lower limit value becomes the minimum output voltage of the DCDC converter 30 or the maximum value of the operation guarantee voltage of the components 501 to 503 connected to the DCDC converter 30. Here, the minimum output voltage of the DCDC converter 30 is set to be higher than the maximum value of the operation guarantee voltage of all the components 501 to 503 and not lower than the operation guarantee voltage of all the components 501 to 503.

[0095] For example, if the correction request is greater than the upper limit, the power supply voltage output from the DCDC converter 30 and supplied to the low voltage battery 50, the power distributor 70, the first control device 100A to 100C, and the components 501 to 503 is greatly reduced. That is, the third control device 300 can determine that a failure has occurred somewhere in the vehicle-mounted power control system.

[0096] Furthermore, when the correction request is smaller than the lower limit value, third control device 300 determines that the correction value calculated by first control devices 100A to 100C is abnormal, and can determine that a failure has occurred in first control devices 100A to 100C.

[0097] That is, by comparing the correction value indicated by the correction request with the upper limit value and the lower limit value, a fault state in the vehicle-mounted power control system can be detected promptly, thereby improving reliability.

[0098] Figure 5A 300 receives correction requests indicating correction values ​​within a prescribed range from the first control device 100A and the first control device 100B. On the other hand, the third control device 300 receives a correction request outside the prescribed range from the first control device 100C. The correction value indicated by the correction request is a value less than the maximum value of the operation guarantee voltage of all components 501 to 503, and it can be seen that the correction request indicating the correction value calculated by the first control device 100C is abnormal. When the value indicated by the correction request is outside the prescribed range, the third control device 300 regards it as a precursor of a fault and functions as a warning unit for issuing a warning.

[0099] Below, refer to Figure 5B The fault diagnosis process of this embodiment will be described. Figure 5B This is a control flowchart of the third control device 300 in the fifth embodiment.

[0100] Figure 5B The flowchart shown is executed at fixed or variable intervals after the startup process and initialization process of the third control device 300 are completed. The power supply voltage correction method executed by the first control devices 100A to 100C is the same as that of the first embodiment, so the description thereof is omitted.

[0101] First, in step S500, the third control device 300 stores the correction value indicated by the correction request determined in the previous task in the memory. In the case of the first task, a preset setting value is stored.

[0102] Next, in step S510 , the calibration request receiving unit 305 of the third control device 300 receives the calibration requests transmitted from the plurality of first control devices 100A to 100C.

[0103] In step S520, the third control device 300 determines whether the correction value indicated by each correction request received from the first control devices 100A to 100C exceeds the upper limit value. If the correction value indicated by the correction request does not exceed the upper limit value, the process proceeds to step S530, and if the correction value indicated by the correction request exceeds the upper limit value, the process proceeds to step S560.

[0104] In step S530, the third control device 300 determines whether the correction value indicated by each correction request received from the first control devices 100A to 100C is less than the lower limit value. If the correction value indicated by the correction request is not less than the lower limit value, the process proceeds to step S540, and if the correction value indicated by the correction request is less than the lower limit value, the process proceeds to step S560.

[0105] The process of step S540 is executed when the correction value indicated by the correction request is within the predetermined range. Specifically, in step S540, the third control device 300 selects the correction request with the largest correction value from the plurality of correction requests.

[0106] Then, in step S550 , the third control device 300 transmits the calibration request selected in step S540 to the second control device 200 .

[0107] On the other hand, step S560 is executed when the correction value indicated by each correction request is not within the predetermined range. In step S560, the third control device 300 stores the state information of the failure state or the failure precursor state in the memory.

[0108] In step S570 , the correction value (previous value) of the previous task in the normal state is determined as the correction value of the current task.

[0109] (Effects of the Fifth Embodiment) According to the fifth embodiment using the above method, by comparing the correction value indicated by the correction request with the upper and lower limit values, a fault state or a fault precursor state in the vehicle-mounted power control system can be detected promptly, thereby improving reliability.

[0110] (Sixth Implementation Method) Next, refer to Fig. 6A and Figure 6B A sixth embodiment will be described. Fig. 6A 1 is a timing chart showing the change in the output voltage of the DCDC converter 30 according to the sixth embodiment.

[0111] The vehicle-mounted power control system of this embodiment is different from the second embodiment in that a period during which the correction requests transmitted from the first control devices 100A to 100C are received is set when the third control device 300 of the second embodiment collects the correction requests.

[0112] Specifically, the second control device 200 sends an output voltage change instruction to the DCDC converter 30, and the DCDC converter 30 changes the output voltage and adjusts the output voltage to the target power supply voltage. At this time, the period from when the change instruction is sent to the DCDC converter 30 to when the output voltage of the DCDC converter 30 is adjusted is set as a mask period, and the third control device 300 does not accept the calibration request from the first control devices 100A to 100C.

[0113] By setting the above-mentioned masking period, it is possible to stop accepting new calibration requests during the transient response period of the DCDC converter 30 changing the output voltage. This can shorten the output voltage setting time of the DCDC converter 30 and improve the stability of the DCDC converter 30.

[0114] exist Fig. 6A , a period from the receipt of a correction request to the setting of the output voltage of the DCDC converter 30 is shown, and the control of changing the output voltage of the DCDC converter 30 is repeated according to the change instruction.

[0115] The control period A until time T100 indicates a period during which the third control device 300 receives a plurality of calibration requests transmitted from the first control devices 100A to 100C.

[0116] The control period B from time T100 to time T110 represents a period during which the third control device 300 interrupts the reception of the correction request sent from the first control devices 100A to 100C. In this control period B, the third control device 300 selects the correction request, or sends the correction request to the second control device 200, or the second control device 200 sends a change instruction to the DCDC converter 30.

[0117] The control period C until time T110 to T120 is a period required for the adjustment of the output voltage of the DCDC converter 30, and indicates a period until the output voltage converges / adjusts to the final correction value. In this control period C, the third control device 300 also interrupts the reception of the correction request sent from the first control devices 100A to 100C. That is, the control period B and the control period C are masking periods.

[0118] Below, refer to Figure 6B The setting process of the mask period according to the present embodiment will be described. Figure 6B This is a control flowchart of the third control device 300 in the sixth embodiment. Figure 6B The flowchart shown is executed at regular or variable intervals after the start-up process and initialization process of the third control device 300 are completed. The power supply voltage correction method executed by the first control devices 100A to 100C is the same as that of the first embodiment, so the description thereof is omitted.

[0119] First, in step S600, the third control device 300 stores control period information in the collective control and moves to step S610. The control period is switched to control period A, control period B, and control period C using, for example, a timer function mounted on the microcomputer and a control period determination process described later.

[0120] In step S610, the third control device 300 checks the control period information, and if it is the control period A, it moves to step S615, and if it is the control period B or the control period C, it moves to step S630.

[0121] Next, in step S615, the third control device 300 performs setting of permission to receive the calibration request, and the process proceeds to step S620.

[0122] In step S620, the third control device 300 executes a selection process of a calibration request, for example, executes the aggregation function operation of the calibration requests in the second embodiment, and then moves to step S625.

[0123] In step S625, the third control device 300 changes the control period information to period B, and ends the task processing.

[0124] On the other hand, in step S630, the third control device 300 performs setting to prohibit reception of the calibration request, and sets the setting not to receive the calibration request transmitted from the first control devices 100A to 100C. After the setting, the process proceeds to step S635.

[0125] In step S635, the third control device 300 determines whether a calibration request has been sent to the second control device 200. If a calibration request has been sent, the third control device 300 proceeds to step S640, and if not, proceeds to step S655.

[0126] Next, in step S640, the third control device 300 acquires information on the output control state of the DCDC converter 30. The information on the DCDC converter 30 may be sent to the third control device 300 via the second control device 200, or may be directly sent from the DCDC converter 30 to the third control device 300. Then, the process moves to step S645.

[0127] In step S645, the third control device 300 checks the output control state of the DCDC converter 30, and checks whether the output control is completed and whether the output voltage stabilization time has passed. If the output control is completed and the output stabilization time has passed, the process moves to step S650. If the output control is not completed or the output stabilization time has not passed, the process does not move to step S650 and the task processing ends.

[0128] In step S650, the third control device 300 changes the control period information to period A, and ends the task processing.

[0129] In step S655, the third control device 300 transmits a calibration request to the second control device 200, and ends the task processing.

[0130] (Effects of the Sixth Embodiment) According to the sixth embodiment using the above method, the reception of a new correction request can be interrupted during the transient response period of the DCDC converter 30 controlling the increase or decrease of the output voltage, thereby shortening the output voltage setting time of the DCDC converter 30 and improving the stability.

[0131] (Seventh Implementation Method) Next, refer to Figure 7A to Figure 7C A seventh embodiment will be described. Fig. 7A This is a diagram showing correction requests collected by the third control device 300 according to the seventh embodiment.

[0132] The vehicle-mounted power control system 2 of this embodiment uses the information of the priority request and the general request of the correction request transmitted from the first control devices 100A to 100C when the third control device 300 of the second embodiment selects a correction request from a plurality of correction requests.

[0133] A plurality of components 501 to 503 are connected to the first control devices 100A to 100C. Each component 501 to 503 is associated with an external recognition function related to driving, braking, steering or automatic driving of the vehicle, and is classified into important components (priority loads) directly related to the basic performance of the vehicle and general components (general loads) related to audio, electric seat functions, etc. The power supply voltage supplied to each component is given priority to the important components.

[0134] Specifically, the correction requests sent from the first control devices 100A to 100C include correction requests with a high priority and correction requests with a low priority. In the function of receiving and aggregating the correction requests of the third control device 300, the third control device 300 first aggregates the correction requests with a high priority from the correction requests with a high priority and the correction requests with a low priority received, selects a correction request from them, and sends it to the second control device 200. Then, the third control device 300 aggregates the correction requests with a low priority, selects a correction request from them, and sends it to the second control device 200.

[0135] By using the above-mentioned collective correction request function, it is possible to obtain the effect of being able to preferentially supply power supply voltage to important components, thereby being able to maintain and suppress a decrease in the basic performance of the vehicle.

[0136] like Fig. 7A As shown, a correction request with a high priority and a correction request with a low priority are sent from the three first control devices 100A to 100C, respectively. STEP0 indicates the current control voltage of the DCDC converter 30, STEP1 indicates a summary of the correction requests with a high priority, from which the correction values ​​indicated by the correction requests with a high priority of the highest correction value are shown, and STEP2 indicates a summary of the correction requests with a low priority, from which the correction requests with a low priority of the highest correction value are shown. When the highest correction value of the correction request with a low priority is lower than the highest correction value of the correction request with a high priority, the correction request of STEP2 is not sent.

[0137] use Figure 7B and Figure 7C The following describes in detail the correction request aggregation operation according to the present embodiment. Figure 7B This is a control flow chart of the third control device 300 in the seventh embodiment. Figure 7B The flowchart shown is executed at regular or variable time intervals after the startup process and initialization process of the third control device 300 are completed. Figure 7C It is a diagram showing storage data of a correction request received by the third control device 300 according to the seventh embodiment.

[0138] In step S700 , the third control device 300 receives a plurality of calibration requests transmitted from the first control devices 100A to 100C, and the process proceeds to step 710 .

[0139] In step S710, the third control device 300 stores the received plurality of calibration requests in the memory and transfers to step S720. Figure 7C As shown, the received plurality of correction requests are stored in the memory.

[0140] In step S720, the third control device 300 obtains the maximum value from the stored correction requests with high priority, and the process proceeds to step S730.

[0141] In step S730, the third control device 300 transmits the high-priority calibration request acquired in step S720 to the second control device 200. Then, the process proceeds to step S740.

[0142] Next, in step S740, the third control device 300 obtains the maximum value from the stored correction requests with low priorities, and the process proceeds to step S750.

[0143] In step S750, the third control device 300 compares the maximum value of the high-priority correction request obtained in step S720 with the maximum value of the low-priority correction request obtained in step S740. When the maximum value of the low-priority correction request is larger, the process proceeds to step S760. When the maximum value of the high-priority correction request is larger, step S760 is not executed and the processing of this task is terminated.

[0144] In step S760, the third control device 300 transmits the low-priority calibration request acquired in step S740 to the second control device 200, and ends the task processing.

[0145] (Effects of the Seventh Embodiment) In the seventh embodiment, the power supply voltage required by important components directly related to the basic performance of the vehicle can be supplied with priority. Thus, a highly safe system can be constructed that prioritizes the basic performance of the vehicle.

[0146] (Variation Example) The present disclosure is not limited to the above-mentioned embodiments, but includes various variations. For example, the above-mentioned embodiments are detailed descriptions for the purpose of easily understanding the present disclosure, and are not necessarily limited to having all the described structures. In addition, a part of the structure of some embodiments can be replaced with the structure of other embodiments, and the structure of other embodiments can be added to the structure of a certain embodiment. In addition, for a part of the structure of each embodiment, other structures can be added, deleted, or replaced.

[0147] For example, the first control device 100, 100A, 100B, 100C of the above-mentioned embodiment may be a regional ECU provided for each area of ​​the vehicle, or a domain ECU provided for each function of the vehicle, or a central ECU which is communicatively connected to each regional ECU or each domain ECU and uniformly controls each regional ECU. Explanation of symbols

[0148] 1, 2, 3, 4… On-board power control system 10…High voltage battery 20…1st power line 30…DCDC converter 40…2nd power line 50…Low voltage battery 51, 101, 102, 201, 301…Signal lines 60…3rd power line 70…Power distributor 80…4th power line 81…6th power line 82…7th power line 90…5th power line 80-1, 80-2, 90-1, 90-2, 90-3... power cord 100, 100A, 100B, 100C ... first control device 110…Wiring resistance acquisition unit 120…Current acquisition unit 130…Voltage drop calculation unit 135…Parts Information 140 ...Correction value determination unit 150…Calibration request sending unit 160 ...Calibration request receiving unit 165…Correction Request Summary 170…Semiconductor switch 171…Semiconductor switch 172…Semiconductor switch 173…Semiconductor switch group 180…Microcomputer 200…Second control device 210 ...Calibration request receiving unit 211 ... Correction value indicating unit 300…3rd control device 305 ...Calibration request receiving unit 310…Correction Request Summary 501, 502, 503… parts SW1, SW2, SW3, SW4… switches.

Claims

1. A vehicle-mounted power control system, characterized in that: have: Power supply unit; a control device connected to the power supply device via a first power line; and one or more loads connected to the control device via a second power line, The control device has: a wiring resistance acquisition unit that acquires wiring resistance values ​​of the first power line and the second power line; a current acquisition unit that acquires a first current value supplied to the control device via the first power line and a second current value supplied to the load via the second power line; a voltage drop amount calculation unit that calculates the voltage drop amounts in the first power line and the second power line based on the wiring resistance value acquired by the wiring resistance acquisition unit, the first current value acquired by the current acquisition unit, and the second current value acquired by the current acquisition unit; a correction value determination unit that determines a correction value for correcting an output voltage of the power supply device based on the voltage drop amount calculated by the voltage drop amount calculation unit; as well as A correction request output unit outputs a correction request indicating the correction value determined by the correction value determination unit.

2. The vehicle-mounted power control system according to claim 1, characterized in that: A power supply voltage control device is further provided for controlling the output voltage of the power supply device. The correction request output unit outputs the correction request to the power supply voltage control device, The power supply voltage control means controls an output voltage of the power supply means according to the correction request.

3. The vehicle-mounted power control system according to claim 1, characterized in that: The voltage drop amount calculation unit calculates the voltage drop amount based on an estimated temperature value of the first power line or the second power line.

4. The vehicle-mounted power control system according to claim 2, characterized in that: The control device is provided in multiple numbers for each area of ​​the vehicle. Each correction request output unit of the plurality of control devices outputs the correction request for correcting the output voltage of the power supply device.

5. The vehicle-mounted power control system according to claim 4, characterized in that: further comprising a collective control device for receiving a plurality of the correction requests outputted from the correction request output units of the plurality of control devices, the collective control means outputting the correction request selected from the plurality of correction requests to the power supply voltage control means, The power supply voltage control means controls the output voltage of the power supply means according to the selected correction request.

6. The vehicle-mounted power control system according to claim 5, characterized in that: The collective control device selects the correction request indicating the highest voltage value from among the plurality of correction requests.

7. The vehicle-mounted power control system according to claim 4, characterized in that: One of the plurality of control devices receives one or more of the correction requests output from the correction request output unit of one or more other control devices, the one control device outputting the correction request outputted from the correction request output unit of the one control device and the correction request selected from the one or more correction requests outputted from the correction request output units of the other one or more control devices to the power supply voltage control device, The power supply voltage control means controls the output voltage of the power supply means according to the selected correction request.

8. The vehicle-mounted power control system according to claim 7, characterized in that: The one control device selects the correction request indicating the highest voltage value from among the plurality of correction requests.

9. The vehicle-mounted power control system according to claim 4, characterized in that: The plurality of control devices are connected via a ring topology.

10. The vehicle-mounted power control system according to claim 9, characterized in that: The multiple control devices connected via a ring topology output a first correction request representing a correction value determined based on a voltage drop in a first power supply voltage supply path, and a second correction request representing a correction value determined based on a voltage drop in a second power supply voltage supply path different from the first power supply voltage supply path.

11. The vehicle-mounted power control system according to claim 1, characterized in that: The device further includes a warning unit for issuing a warning as a precursor of a failure when the value indicated by the correction request is outside a predetermined range.

12. The vehicle-mounted power control system according to claim 11, characterized in that: The upper limit value of the prescribed range is the minimum value of the absolute maximum rating of the one or more loads, and the lower limit value of the prescribed range is the maximum value of the minimum guaranteed operation voltage of the one or more loads.

13. The vehicle-mounted power control system according to claim 2, characterized in that: The power supply voltage control device masks a new correction request from the time the correction request is received until the output voltage of the power supply device based on the correction request is stabilized.

14. The vehicle-mounted power control system according to claim 1, characterized in that: The loads include priority loads related to the basic performance of the vehicle, The correction value determination unit determines the correction value based on the voltage drop amount and the operation guarantee voltage of the priority load.

15. A control device, which is a control device of a vehicle-mounted power control system, connected to a power supply device via a first power supply line, and connected to one or more loads via a second power supply line, The control device is characterized by comprising: a wiring resistance acquisition unit that acquires wiring resistance values ​​of the first power line and the second power line; a current acquisition unit that acquires a first current supplied to the control device via the first power line and a second current supplied to the load via the second power line; a voltage drop amount calculation unit that calculates the voltage drop amounts in the first power line and the second power line based on the wiring resistance value acquired by the wiring resistance acquisition unit, the first current acquired by the current acquisition unit, and the second current acquired by the current acquisition unit; a correction value determination unit that determines a correction value for correcting an output voltage of the power supply device based on the voltage drop amount calculated by the voltage drop amount calculation unit; as well as A correction request output unit outputs a correction request indicating the correction value determined by the correction value determination unit.

16. A centralized control device, which is a centralized control device connected to the plurality of control devices according to claim 15 so as to be communicable, wherein: The correction request selected from the plurality of correction requests outputted from the correction request output units of the plurality of control devices is outputted to a power supply voltage control device that controls an output voltage of the power supply device.

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