JP2003220908A - Electric power supply system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power supply system for a vehicle capable of thinning a main electric line. <P>SOLUTION: This electric power supply system for the vehicle is featured to comprise of; an excess current determining information memory means D1 to store excess current determining information to determine an excess current state of the main electric line 1; a cutoff order information memory means D2 to store cutoff order information to show an order to cut off supply of power to loads 3a-3c; an electric current information generation means P1 to generate electric current information to show an electric current value of an electric current flowing on the main electric line 1; cutoff means 40a-40c provided on each of branch electric lines 2a-2c and to cut off supply of power from the branch electric lines 2a-2c to the loads 3a-3c; an excess current determining means P2 to determining an excess current state in accordance with the electric current information and the excess current judgement information generated by the electric current information generation means P1; and a control means P3 to control cutoff of the cutoff means 40a-40c provided on the branch electric lines 2a-2c in accordance with the cutoff order information of the cutoff order information memory means D2 when the excess current determining means P2 determined to be in the excess electric current state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power supply device, and more specifically, to a plurality of loads mounted on a vehicle, a full load simultaneous supply via a branch electric wire connected to each of the loads. The present invention relates to a vehicle power supply device that distributes and supplies electric power from a trunk wire that is in an overcurrent state when a current having a value lower than the current value flows.

[0002]

2. Description of the Related Art A vehicle is equipped with various loads such as an indoor equipment system such as a power window and a control system such as an engine control. These loads distribute electric power from a power source such as a battery. I am trying to supply it.

As shown in FIG. 7, a power supply unit 20 is connected to one end of the trunk electric wire 1 and branch electric wires 2a to 2 from the other end.
f is branched. The loads 3a to 3f are connected to the branch electric wires 2a to 2f, and the electric power from the main electric wire 1 is distributed via the branch electric wires 2a to 2f and supplied to the loads 3a to 3f. .

Each of the trunk electric wire 1 and the branch electric wires 2a to 2f is provided with fuses F and Fa to Ff for protecting the electric wires from overheating, overcurrent, overvoltage and the like. When using fuses and relays, it is necessary to replace the blown fuses and reset the relays.Because the fuse box is installed in a relatively limited place to facilitate maintenance of the relays and fuses, However, the intelligent power switch (IPS) has been used in recent years because it has some problems such as restricting the degree of freedom of the layout of the wire harness and complicating the wiring.

Here, a conventional method for setting the wire size of the trunk wire 1 will be described. For example, the loads 3a, 3
f is an intermittent load that consumes power intermittently such as a power window, loads 3b to 3e are continuous loads that continuously consume power such as tail lamps and stop lamps, and load 3a is 1
7 [A], load 3b is 12 [A], load 3c is 4
[A], load 3d requires 4 [A], load 3e requires 5 [A], and load 3f requires current of 13 [A],
30 [A] that is the total current value of the intermittent load is added to 25 [A] that is the total current value of the continuous load, and the fuse F of 60 [A] is set based on the addition result. The electric wire size is, for example, 8 [sq. mm. ]] Is set.

[0006]

As described above, since the wire size of the trunk wire 1 is conventionally set by assuming the total current value of the loads 3a to 3f, the wire size of the trunk wire 1 has a safety factor. The size was taken into consideration, and it was not possible to make the trunk wire 1 thinner. In addition, as the load to be supplied with electric power increases, the electric wire size of the main electric wire 1 must be set larger, and the increase in the electric wire size increases the cost and weight of the system installed in the vehicle. Was the cause of. In particular, in recent years, the number of loads mounted on vehicles has been increasing, and there has been a demand for a thinner main wire 1.

Therefore, the present invention has been made in view of the above problems.
An object of the present invention is to provide a vehicle power supply device that can reduce the thickness of a main wire.

[0008]

A vehicle power supply device according to a first aspect of the present invention, which has been made in order to solve the above-mentioned problems, has a plurality of units mounted on a vehicle as shown in the basic configuration diagram of FIG. With respect to the loads 3a to 3c, all the loads 3a to 3 via the branch electric wires 2a to 2c connected for each of the loads 3a to 3c.
c A power supply device for a vehicle, which distributes and supplies electric power from the trunk electric wire 1 which is in an overcurrent state when a current having a value lower than a current value at the time of simultaneous supply is supplied. Overcurrent determination information storage means D1 for storing the overcurrent determination information for determining the state, and the loads 3a to 3c.
Disconnection sequence information storage means D2 for storing disconnection sequence information indicating the sequence of interrupting the supply, current information generation means P1 for generating current information indicating the current value of the current flowing through the trunk electric wire 1, and the branch. Breaking means 40a to 40c that are provided for each of the electric wires 2a to 2c and that cut off the supply of electric power from the branch electric wires 2a to 2c to the loads 3a to 3c, and the current information generated by the current information generating means P1 and the transient information. Overcurrent determination means P for determining the overcurrent state based on the overcurrent determination information stored in the current determination information storage means D1
2, and when the overcurrent determination means P2 determines that the overcurrent state is present, the interruption means 40a-4a based on the interruption sequence information stored in the interruption sequence information storage means D2.
Control means P3 for controlling interruption of 0c.

According to the electric power supply system for a vehicle of the present invention described in claim 1, all the loads 3a to 3 in the trunk wire 1 are provided.
When the current value lower than the current value at the time of simultaneous supply of c flows, the overcurrent determination information for determining the overcurrent state is stored in the overcurrent determination information storage unit D1. Then, for example, cutoff order information indicating the order of cutting off the supply of electric power to the loads 3a to 3c, which does not affect the safety of the vehicle and is used less frequently, is stored in the cutoff order information storage unit D2. To be done. Then, when the current information generating means P1 generates current information corresponding to the trunk wire 1, the trunk wire 1 is generated based on this current information and the overcurrent determination information stored in the overcurrent determination information storage means D1. Whether or not it is in the overcurrent state is determined by the overcurrent determination means P2. And
When it is determined that the branch current is in the overcurrent state, the branch electric wire 2 is determined based on the breaking order information stored in the breaking order information storage unit D2.
The control means P3 controls the interruption of the interruption means 40a-40c provided in a-2c.

Therefore, the overcurrent determination information for determining the overcurrent state is provided when a current having a value lower than the current value at the time of simultaneously supplying all the loads 3a to 3c to the main wire 1 is provided. When the overcurrent state is determined based on the current information, the power supply to the loads 3a to 3c is cut off based on the order indicated by the cutoff order information. Therefore, the smoke generation characteristic of the wire used as the trunk wire 1, the wire size, etc. are considered. By setting the overcurrent determination information in advance, it becomes possible to use as the trunk wire 1 an electric wire of an electric wire size in which only a current of a value lower than the current value when the loads 3a to 3c are simultaneously supplied can be used. Moreover, it is not necessary to set the wire size of the trunk wire 1 in consideration of the safety factor and the like. Further, by predetermining the order of the loads 3a to 3c to be cut off according to the detection of the overcurrent state, it is possible to surely cut off the power to the loads that do not affect the safety of the vehicle, and thus the safety of the vehicle. Does not lower the Therefore, it is possible to reduce the thickness of the main electric wire 1, which can contribute to cost reduction and weight reduction of the electric wire mounted in the vehicle.

In order to solve the above-mentioned problems, the invention according to claim 2 is, as shown in the basic configuration diagram of FIG. 1, in the vehicular power supply apparatus according to claim 1, the smoke of the trunk wire 1 is generated. A temperature information detection unit P4 for detecting temperature information indicating a temperature that influences the characteristic is further provided, and the overcurrent determination information storage unit D1 uses the overcurrent determination information to influence the smoke generation characteristic of the trunk wire 1. The overcurrent determination means P2 performs the determination based on the overcurrent determination information corresponding to the temperature information detected by the temperature information detection means P4.

According to the electric power supply system for a vehicle of the present invention described in claim 2, the overcurrent determination information storage means D1 stores the overcurrent determination information corresponding to the temperature which affects the smoke generation characteristic of the trunk wire 1. Is memorized. Then, the temperature information detecting means P4 detects the temperature information indicating the temperature that affects the smoke generation characteristic of the trunk wire 1, and it is determined whether or not the current is the overcurrent state based on the overcurrent determination information corresponding to the temperature information. It is determined by the current determination means P2. Therefore, the trunk wire 1
The temperature information detection means P4 is provided to detect the temperature that affects the smoke emission characteristics of the above, and the overcurrent determination information is stored in association with the temperature that affects the smoke emission characteristics corresponding to the temperature and corresponds to the detected temperature. Since the overcurrent state of the main wire 1 is determined based on the overcurrent determination information, the overcurrent state of the main wire 1 can be reliably detected even if a temperature change due to the environment, a temperature change in the vehicle, or the like occurs. It is possible to reliably prevent smoke generation due to temperature change. Therefore, it is possible to further reduce the thickness of the trunk electric wire 1 while considering the smoke generation characteristics due to the temperature change.

In order to solve the above problems, the invention according to claim 3 is, as shown in the basic configuration diagram of FIG. 1, in the vehicle power supply device according to claim 1 or 2, the current information generation is performed. The means P1 includes each of the branch electric wires 2a to 2c.
The current information is generated based on the sum of the current values of the currents flowing through the control means P3, and the control means P3 further performs the control based on the current information generated by the current information generation means P1. To do.

According to the electric power supply system for a vehicle of the present invention described in claim 3, the current information generating means P1 generates current information based on the sum of the current values of the currents flowing through the branch electric wires 2a to 2c. Based on this current information and the interruption order information stored in the interruption order information storage means D2, the interruption means 40a-40 provided on the branch electric wires 2a-2c.
The interruption to c is controlled by the control means P3. Therefore, since interruption | blocking with respect to the interruption | blocking means 40a-40c is controlled based on the electric current value of the electric current which flows through each branch electric wire 2a-2c, and interruption | blocking order information, of the electric current which actually flows through each branch electric wire 2a-2c. It is possible to quickly shut off the shutoff means 40a to 40c to be shut down based on the current value. Therefore, it is not necessary to provide a device for detecting the current value with respect to the trunk wire 1, so that the cost of the device can be reduced.

In order to solve the above-mentioned problems, the invention according to claim 4 is, in the vehicle power supply apparatus according to any one of claims 1 to 3, as shown in the basic configuration diagram of FIG. In response to the overcurrent determination means P2 determining that the overcurrent state is the overcurrent state, the overcurrent state causes the loads 3a to 3c.
Warning information generating means P5 for generating warning information for warning to cut off the electric power to the device, and outputting the warning information for causing the warning based on the warning information generated by the warning information generating means P5. Alarm information output means P6
And are further provided.

According to the electric power supply system for a vehicle of the present invention described in claim 4, when the overcurrent judging means P2 judges that the overcurrent condition exists, the load 3 is detected by the overcurrent condition.
Warning information for warning that power to a to 3c is cut off is generated by the warning information generating means P5. Then, in order to give an alarm based on the alarm information, the alarm information is output to the display device, the alarm device, etc. by the alarm information output means P6. Therefore, when an overcurrent state in the trunk electric wire 1 is detected, warning information for warning the driver or the like of this overcurrent state is output, so that the loads 3a to 3
The driver or the like can be informed that the power to c is cut off. Furthermore, if the configuration is such that it has information instructing a coping method for avoiding an overcurrent state, it is possible to cause the driver or the like to stop using the loads 3a to 3c. Therefore, when the trunk wire 1 is in the overcurrent state, the load 3a ...
It is possible to prompt the driver or the like to promptly recognize that the power to 3c has been stopped.

In order to solve the above-mentioned problems, the invention according to claim 5 is, in the vehicle power supply device according to any one of claims 1 to 4, as shown in the basic configuration diagram of FIG. When the overcurrent determination means P2 determines that the overcurrent state is present, the above-mentioned current is generated based on the current information generated by the current information generation means P1 and the overcurrent determination information stored in the overcurrent determination information storage means D1. Change detection means P7 for detecting a change from an overcurrent state to a normal state, and when the change detection means P7 detects the change, when the supply of power to the interrupted loads 3a to 3c is restored. The loads 3a to 3 that calculate the current value in the trunk electric wire 1 and cut off the power supply based on the calculation result.
and a recovery determination unit P8 that determines the loads 3a to 3c that can be recovered from the control unit P3.
Is characterized in that the shutoff means 40a to 40c corresponding to the determination result of the return determination means P8 are controlled to restart the supply.

According to the electric power supply system for a vehicle of the present invention described in claim 5, when the overcurrent judging means P2 judges that it is in the overcurrent state, the current information generated by the current information generating means P1 is detected. The change detecting means P7 detects a change from the overcurrent state to the normal state based on the overcurrent determination information in the overcurrent determination information storage means D1. Then, when the change is detected, the current value in the trunk electric wire 1 when the power supply to the interrupted loads 3a to 3c is restored is calculated, and the power supply is cut off based on the calculation result. Load 3a that can be restored from among the loaded loads 3a to 3c
3c are determined by the return determination means P8, and the cutoff means 40a-40c corresponding to this determination result are controlled by the control means P3 so as to restart the supply. Therefore, after detecting the overcurrent state in the main electric wire 1, the change in the normal state from the overcurrent state is monitored, and when the change is detected,
Since only the supply of power to the recoverable loads 3a to 3c is restarted, it is possible to prevent the trunk wire 1 from returning to the overcurrent state due to the restart of the power supply. Therefore, when the trunk wire 1 returns to the normal state, the recoverable loads 3a to 3c quickly recover, so that the trunk wire 1
Can be further thinned.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vehicle power supply device according to the present invention will be described below with reference to the drawings of FIGS. It should be noted that the same or corresponding parts as those described in the background art will be designated by the same reference numerals and detailed description thereof will be omitted.

Here, FIG. 2 is a configuration diagram showing a schematic configuration of the vehicle power supply device according to the present invention, FIG. 3 is a configuration diagram showing an example of a schematic configuration of the IPS, and FIG. It is a figure which shows an example of the memory map of the EEPROM shown in FIG. 5, FIG. 5 is a graph which shows the smoke emission characteristic of a trunk wire, and FIG.
5 is a flowchart showing an example of an outline of processing according to the present invention performed by the CPU of FIG.

As shown in FIG. 2, one end side of the trunk electric wire 1 is connected to a power source section 20 such as a battery, and branch electric wires 2a to 2n are branched from the other end side. Branch wires 2a, 2b, ..., 2n are connected to the door module 30a, the entertainment module 30b ,.

The door module 30a is a module for controlling a power window switch, a motor, a lock / unlock solenoid, etc., and the entertainment module 30b is a module for controlling AV equipment mounted on a vehicle, and a center cluster module. Reference numeral 30n is a module for controlling various measuring instruments, a display device and the like which constitute the combination meter.

Each of the branch electric wires 2a to 2n has an electric wire size in which a safety factor is taken into consideration in a current value to be applied to a connected load. Then, in order to protect each electric wire from overheating, overcurrent, overvoltage, etc., an intelligent power switch (hereinafter referred to as IPS) 40, which is a well-known technique, is provided on the trunk electric wire 1 and an IPS 40 is provided on each of the branch electric wires 2a to 2n.
a to 40n are provided.

For example, the IPS is, as shown in FIG. 3, a switching element (eg FET) H for switching a current to a load, a gate drive circuit I for turning on / off the switching element H, an overvoltage protection circuit for protecting an overvoltage. L, an overheat detection circuit K for detecting the junction temperature of the switching element H, an overcurrent detection circuit J for detecting the current flowing through the switching element H, a logic circuit G for operating the gate of the switching element H, and the like. It is configured.

In this IPS, the INPUT side is connected to the upstream side of the trunk electric wire 1 or the branch electric wire 2, the OUTPUT side is connected to the downstream side of the trunk electric wire 1 or the branch electric wire 2, and a CPU to be described later is also connected. Then, in this IPS, the gate of the switching element is normally turned on by the gate drive circuit I, and the current from the power supply unit 20 input from the INPUT is OU via the switching element H.
By outputting from TPUT, electric power is selectively supplied to the downstream side according to control from the CPU.

When a short circuit or the like occurs on the downstream side of the IPS and an overcurrent flows, temperature information and current information detected by the overheat detection circuit K and the overcurrent detection circuit J (both are signals such as voltage level). Replaced by the logic circuit G
Is input to the logic circuit G with a specified value recorded in the logic circuit I, and if an abnormality is recognized as a result, the gate drive circuit I turns off the gate of the switching element H, and At the same time, a data signal indicating the IPS state, current value, etc. is output.

Further, in the present embodiment, when the control signal indicating the output request from the CPU is input to the logic circuit G, the temperature information and the current information detected by the overheat detection circuit K and the overcurrent detection circuit J are displayed. Output as a data signal and C
When a control signal indicating a cutoff request from the PU is input to the input circuit G, the gate drive circuit I turns off the gate of the switching element to cut off the current flowing through the switching element H, thereby configuring the IPS. There is.
Therefore, as is clear from the above explanation, IPS
Functions as the blocking means described in the claims.

The vehicle power supply device 10 according to the present invention is
As is well known, a central processing unit (CPU) 11 that performs various kinds of processing and control according to a predetermined program,
ROM 12, which is a read-only memory that stores programs and the like for the CPU 11, RAM 13, which is a readable and writable memory that stores various data and has an area necessary for the processing work of the CPU 11, CP
An input / output interface (hereinafter referred to as I / F) 14 for connecting the U11 and the cable C, the above-mentioned IPS 40, 4
0a to 40n, and the like.

The CPU 11 has the above-mentioned IPS 40, 40.
a to 40n are connected to each other, the CPU 11 outputs the control signal to each of the IPSs 40 and 40a to 40n, and each of the IPSs 40 and 40a to 40n outputs the CPU 1 to the CPU 1.
The data signal is output for 1.

The vehicle power supply device 10 is further provided with an electrically erasable / rewritable read-only memory (EEPRO) capable of retaining stored contents even when the main body of the device is off.
M) 15 is connected to the CPU 11. This EEPRO
As shown in FIG. 4, the M15 stores various information such as trunk wire identification information, disconnection order information, and IPS status information.

The trunk electric wire identification information is information for identifying the trunk electric wire 1 and has data such as product number. The cutoff order information is information indicating the order in which the power supply to the load is cut off, and the cutoff order for the load to be managed is predetermined. Note that, as an example of a method of setting the shutoff order, the load is roughly classified into a running load related to the running performance of the vehicle and a non-running load not related to the usage frequency, demand degree for each non-running load, The shutoff order is set based on power consumption and the like.

The IPS status information is the trunk electric wire 1 and the branch electric wire 2.
The switching elements H of the IPSs 40 and 40a to 40n provided in each of a to 2n indicate whether the power supply state is the energized state / the cutoff state in which the power supply is cut off. Updated every time ~ 40n is controlled.

As described above, in the present embodiment, since the breaking sequence information is stored in the EEPROM 15, the EEPROM 15 functions as the breaking sequence information storage means described in the claims.

The vehicle power supply device 10 further has a temperature sensor 16 corresponding to a temperature information detecting means, and is formed by using a thermocouple, a temperature measuring resistance pair and the like. The temperature sensor 16 is provided, for example, in the vehicle interior, in the vicinity of the engine room, in the vicinity of the trunk wire 1, or the like where the temperature that affects the smoke generation characteristics of the trunk wire 1 arranged in the vehicle can be measured.
The temperature information indicating the detected temperature is output to the connected CPU 11.

Further, the ROM 12 stores a plurality of pieces of overcurrent judgment information for judging the overcurrent state in the trunk electric wire 1 corresponding to each kind of the electric wire. The overcurrent determination information includes, for example, data such as an overcurrent threshold for determining overcurrent and determination conditions. In addition,
In the present embodiment, the overcurrent determination information is stored in association with the temperature that affects the smoke generation characteristics of the trunk wire 1, but the overcurrent determination information may be stored in the EEPROM 15.

Here, an example of the overcurrent determination information for the trunk cable 1 of "CAVS 1.25 sq" will be described. FIG. 5 is a graph showing the smoke generation characteristics of the trunk wire 1, where the vertical axis represents the smoke generation time [sec] and the horizontal axis represents the conduction current [A]. The curve shown by the solid line in the graph is the smoke generation characteristic G1 when the ambient temperature is 40 degrees, and the curve shown by the broken line is the ambient temperature of 6
The smoke emission characteristics G2 at 0 degrees are shown.

When the ambient temperature is 40 degrees, the smoke generation characteristic G1
Considering the above, the overcurrent threshold can be set to 27 [A]. Also, when the ambient temperature is 60 degrees, the smoke generation characteristic G
Considering 2, it is possible to set the overcurrent threshold to 22 [A].

Therefore, in this embodiment, the product number is "CA".
As the overcurrent determination information corresponding to the trunk electric wire 1 of VS 1.25 sq ″, the overcurrent determination information in which the overcurrent threshold corresponding to the ambient temperature of less than 40 degrees is set to 27 [A] and the ambient temperature is 40 2 for the overcurrent threshold corresponding to more than 60 degrees and less than 60 degrees
The ROM 12 stores the overcurrent determination information in which 2 [A] is set.
I remember. As is clear from the above description, in the present embodiment, the ROM 12 functions as the overcurrent determination information storage means described in the claims.

Next, an example of the outline of the processing according to the present invention executed by the CPU 11 in the above-mentioned configuration will be described with reference to the flowchart of FIG.

When the CPU 11 is activated by being supplied with electric power, the work area such as the RAM 13 is initialized in step S1, and then the process proceeds to step S2. In this initial processing, the overcurrent determination information corresponding to the trunk wire identification information in the EEPROM 15 is transferred from the ROM 12 to the RAM.
Deployed in 13 work areas.

Step S2 (corresponding to current information generating means)
In the RAM 13, the control signal indicating the output request is output to the IPS 40 of the trunk wire 1, and the current information indicating the current value of the current flowing through the trunk wire 1 is stored in the RAM 13 based on the data signal input from the IPS 40 in response to the output. Is generated, and then the process proceeds to step S3.

Although the current information is generated based on the output from the IPS 40 in the present embodiment, the sum of the current values indicated by the data signals input from each of the IPSs 40a to 40n is calculated, The result of this calculation can be used as the value of the current flowing through the trunk wire 1.

In step S3, the temperature information input from the temperature sensor 16 is stored in the RAM 13, then in step S4, the overcurrent determination information corresponding to the temperature indicated by the temperature information is extracted from the work area, and then in step S5. move on. In the present embodiment, the temperature information output by the temperature sensor 16 is stored, but
The present invention is not limited to this, and it is also possible to refer to the temperature information output by the IPS 40, and in that case, the temperature sensor 16 may be deleted from the configuration of the vehicle power supply device 10.

In step S5 (corresponding to the overcurrent judging means), the current value indicated by the current information is compared with the overcurrent threshold value indicated by the extracted overcurrent judgment information, and whether or not the current is an overcurrent is determined based on the comparison result. Is determined. If it is determined that the current is not overcurrent (N in step S5), step S
Proceed to 17. On the other hand, if it is determined that the current is an overcurrent (Y in step S5), the process proceeds to step S6.

In step S6, the IPS of the trunk wire 1
40, a control signal indicating an output request is output to the IPS 40a to 40n of the branch electric wires 2a to 2n, and the current flowing through the main electric wire 1 based on the data signal input from the IPS 40 and IPS 40a to 40n in accordance with this output. Current information indicating the current value and branch current information indicating the current value of the current flowing through each of the branch wires 2a to 2n are generated in the RAM 13, and the IPS 40a in which the current is flowing based on this branch current information.
.About.40n are identified, the IPS state information is updated based on the identification result, and then the process proceeds to step S7.

In step S7 (corresponding to the control means), the shutoff sequence information of the EEPROM 15 and the updated IPS
IPS4 to be cut off based on the state information and each branch current value
0a-40n are specified (for example, a simulation etc.), the control signal which shows an interruption | blocking request | requirement is output with respect to the IPS40a-40n, and it progresses to step S8 after that. When a part of the IPSs in the IPSs 40a to 40n is cut off by the process of step S7, the electric power supplied to the downstream side is reduced, so that the current value flowing through the trunk wire 1 is reduced.

In the present embodiment, the IPS to be blocked is specified and blocked based on the interrupt sequence information, the updated IPS state information and each branch current value, but the present invention is limited to this. However, for example, according to the order of the cut-off order information, the IP is applied until the current value of the trunk wire 1 becomes a normal value.
Various different embodiments such as blocking S can be adopted.

Step S8 (corresponding to alarm information generating means)
At the center cluster module 30n, alarm information for alarming an overcurrent state is generated in the RAM 13, and then at step S9 (corresponding to alarm information output means), an alarm based on the generated alarm information is generated at the center cluster module 30n. The alarm information is output to the I / F 14 for execution in step S10, and then the process proceeds to step S10.
By this processing, when the alarm information is transmitted to the center cluster module 30n, the center cluster module 3n
An alarm based on the alarm information is issued on the display device of 0n or the like.

In step S10, similarly to step S2, a control signal indicating an output request is output to the IPS 40 of the trunk electric wire 1, and the trunk electric wire 1 is opened based on the data signal input from the IPS 40 in response to this output. Current information indicating the current value of the flowing current is generated in the RAM 13, and then in step S11, the temperature information input from the temperature sensor 16 is stored in the RAM 13 as in step S3, and then the process proceeds to step S12.

In step S12 (corresponding to change detecting means), the overcurrent determination information corresponding to the temperature indicated by the temperature information is newly extracted from the work area, and the overcurrent threshold value and the current information indicated by the overcurrent determination information indicate it. By comparing the current value with the current value and determining whether or not the current value has returned to the normal state based on the comparison result, the trunk electric wire 1 monitors the change from the overcurrent state to the normal state. The determination process may be performed based on the overcurrent determination information extracted in step S4.

When it is determined in step S12 that the current value has not returned to the normal state (N in step S12),
Returning to step S10, a series of processes is repeated. On the other hand, when it is determined that the current value has returned to the normal state (Y in step S12), the process proceeds to step S13.

In step S13 (corresponding to return determination means), the current value in the trunk electric wire 1 when the supply of power to the IPS 40a-40n that has been interrupted based on the generated current information, branch current information, etc. is restored. And the IPS 40a that cuts off the power supply based on the calculation result.
Of the IPS 40a to 40n from which recovery is possible, a recovery simulation is performed to determine which of the IPSs 40a to 40n are recoverable.
Return determination result information indicating n or the like is generated and stored in the RAM 13, and then the process proceeds to step S14.

In step S14, it is determined based on the return determination result information in the RAM 13 whether or not the return is possible. When it is determined that the return is not possible (N in step S14), the process returns to step S10 and the series of processes is repeated. On the other hand, when it is determined that the return is possible (Y in step S14), the process proceeds to step S15.

In step S15, the control information requesting the ON of the switching element H is output to the recoverable IPSs 40a to 40n indicated by the recovery determination result information, and the control information is output to the IPSs 40a to 40n.
The IPS state information corresponding to n is updated from the cutoff state to the energized state, and then the process proceeds to step S16. By this processing, the IPS 40a-
40n resumes power supply.

In step S16, it is determined based on the IPS status information whether all the IPSs 40a-40n have returned to the energized state. All IPS40
If it is determined that a to 40n have not been restored (N in step S16), the process returns to step S10 and all IPs are returned.
A series of processing is repeated until S40a to 40n are restored. On the other hand, when it is determined that all the IPSs 40a to 40n have been restored (Y in step S16), the process proceeds to step S17.

In step S17, it is determined whether or not a termination request is received in response to turning off the ignition switch of the vehicle. When it is determined that the end request has not been received (N in step S17), the process returns to step S2 and the series of processes is repeated. On the other hand, when it is determined that the termination request is received, the termination processing is executed, and when the processing is terminated, the processing is terminated.

As described above, in the present embodiment, the CPU 11 of the vehicle power supply device 10 causes the current information generating means, the overcurrent determining means, the control means, the alarm information generating means, and the alarm described in the claims. It functions as information output means, change detection means, and return determination means.

Next, the vehicle power supply device 1 according to the present invention.
An example of the operation (action) in the present embodiment of No. 0 will be described below.

When the vehicle power supply device 10 is activated in response to turning on of the vehicle ignition switch, the IPS4
Current information indicating the current value of the current flowing through the trunk wire 1 is generated based on the data signal from 0, and the temperature indicating the temperature that affects the smoke generation characteristic of the trunk wire 1 is detected by the temperature sensor. Then, based on the overcurrent determination information and the current information corresponding to this temperature information, it is determined whether or not the trunk wire 1 is in the overcurrent state. When the trunk wire 1 is in a normal state, this series of processing is repeated.

When it is determined that the trunk wire 1 is in the overcurrent state, the current value of the current flowing through each of the trunk wire 1 and the branch wires 2a to 2n based on the data signal from each of the IPS 40 and IPS 40a to 40n. Is monitored. And EE
Based on the interruption order information of the PROM 15 and the current values of the branch electric wires 2a to 2n, the IPSs 40a to 40n to be interrupted and the interruption order thereof are specified, and the specified IPSs 40a to 40n.
n is cut off.

As a result, the supply of electric power to the load that does not affect the safety of the vehicle is cut off, so that the trunk wire 1 returns from the overcurrent state to the normal state. Further, the alarm information generated in response to the detection of the overcurrent state is transmitted to the center cluster module 30n, and an alarm is issued based on the alarm information on the display unit or the like of the center cluster module 30n. It is possible to know that the supply to the load has been interrupted due to the overcurrent state of the electric wire 1.

After the trunk wire 1 is judged to be in the overcurrent state, the recovery from the overcurrent status to the normal status is monitored based on at least the current value of the current flowing through the trunk wire 1 and the temperature around it. To be done. Then, when the return to the normal state is detected, the current value in the trunk electric wire 1 when the power supply to the interrupted IPS 40a to 40n is restored is calculated, and the power supply is performed based on the calculation result. Shutting off I
IPS 40a that can be restored from PS 40a-40n
The recovery simulation is performed to perform determination of ~ 40n, and the supply of power to the IPSs 40a to 40n determined to be recoverable by the simulation is restarted.

As described above, the trunk wire 1 is connected to the door module 30a, the entertainment module 30b,
.... Provided with overcurrent determination information for determining an overcurrent state when a current having a value lower than the current value when the center cluster module 30n simultaneously supplies all the loads is provided. If the overcurrent state is determined based on the above, the power supply to the load is shut off based on the sequence indicated by the shutoff sequence information. By setting the above, it is possible to use as the trunk wire 1 a wire of a wire size that only flows a current value lower than the current value at the time of simultaneous load supply. It is not necessary to set the wire size of the wire 1.
Further, by predetermining the order of the loads to be cut off according to the detection of the overcurrent state, it is possible to surely cut off the power to the load that does not affect the safety of the vehicle, thus reducing the safety of the vehicle. Nothing. Therefore, it is possible to reduce the thickness of the main electric wire 1, which can contribute to cost reduction and weight reduction of the electric wire mounted in the vehicle.

In addition, a temperature sensor (temperature information detecting means) for detecting the temperature that affects the smoke generation characteristic of the trunk wire 1.
16 is provided, and the overcurrent determination information is stored in association with the temperature that affects the smoke generation characteristics G1, G2, etc. corresponding to the temperature,
Since the overcurrent state of the trunk wire 1 is judged based on the overcurrent judgment information corresponding to the detected temperature, even if the temperature change due to the environment, the temperature change in the vehicle, etc. occur, the trunk wire 1 is surely overheated. It is possible to detect the current state, and it is possible to reliably prevent smoking due to temperature changes.

Further, since the interruption to the IPS (interruption means) 40a to 40n is controlled on the basis of the current value of the electric current flowing through each of the branch electric wires 2a to 2n and the interruption order information, each of the branch electric wires 2a to 2n is controlled. It is possible to quickly shut off the IPS 40a to 40c to be shut down based on the current value of the current actually flowing through the IPS.

Further, when an overcurrent state in the main wire 1 is detected, warning information for warning the driver or the like of this overcurrent state is output to the center cluster 30n, so that power to the loads 3a to 3c is supplied. It is possible to inform the driver etc. that the power will be cut off.

Further, after the overcurrent state in the main electric wire 1 is detected, the change from the overcurrent state to the normal state is monitored,
When the change is detected, only the supply of power to the load that can be restored is restarted, so that it is possible to prevent the trunk wire 1 from returning to the overcurrent state due to the restart of the power supply.

In the above-described embodiment, the vehicle power supply device 10 has been described as having the IPS 40 provided on the trunk electric wire 1. However, the present invention is not limited to this, and the IPS 40 can be configured as follows. Delete and IPS40
Main wire 1 based on the sum of the current values detected at a-40n
It is also possible to adopt a configuration in which current information indicating the current value of is generated.

In addition, a battery and an alternator (hereinafter referred to as A
When the vehicle power supply device 10 of the present invention is applied to the trunk electric wire connected to the (LT), the AL measured as the overcurrent determination information stored in the overcurrent determination information storage means.
The T power generation current value is stored, and when the total current value of each load exceeds this ALT power generation current value and the battery is discharged, particularly when the ALT power generation is insufficient during traffic jam, the battery is overdischarged, and to some extent. When it is determined that the battery abnormal mode has been exceeded due to the above time, the vehicle power supply device 10 cuts off the supply of electric power to the load irrelevant to the traveling performance, as in the above-described embodiment. Since it is possible to reduce the current value in the trunk line, the battery can be protected.

[0070]

As described above, according to the power supply device for a vehicle of the present invention as set forth in claim 1, when a current having a value lower than the current value at the time of simultaneous full load supply to the main wire flows, an overcurrent occurs. When the overcurrent determination information for determining the state is provided, and when it is determined as the overcurrent state based on the overcurrent determination information and the current information, the power supply to the load is cut off based on the order indicated by the cutoff order information. By setting the overcurrent determination information in consideration of the smoke generation characteristics of the wires used as the trunk wires, the wire size, etc., the wires with the wire size that only flows a current value lower than the current value at the time of simultaneous load supply are trunked. Since it can be used as an electric wire, it is not necessary to set the electric wire size of the main electric wire in consideration of the safety factor and the like as in the conventional case. Further, by predetermining the order of the loads to be cut off according to the detection of the overcurrent state, it is possible to surely cut off the power to the load that does not affect the safety of the vehicle, thus reducing the safety of the vehicle. Nothing. Therefore, it is possible to reduce the thickness of the main electric wire, and it is possible to contribute to cost reduction and weight reduction of the electric wire mounted in the vehicle.

According to the invention of claim 2, claim 1
In addition to the effects of the invention described in (1), a temperature information detection means is provided to detect the temperature that affects the smoke generation characteristics of the trunk wire,
Since the overcurrent judgment information is stored in correspondence with the temperature that affects the smoke generation characteristics corresponding to the temperature, and the overcurrent state of the trunk line is judged based on the overcurrent judgment information corresponding to the detected temperature, It is possible to reliably detect the overcurrent state of the trunk wire even if a temperature change due to the temperature change or a temperature change occurring in the vehicle occurs, and it is possible to reliably prevent smoking due to the temperature change. Therefore, there is an effect that it is possible to further reduce the thickness of the trunk electric wire while considering the smoke generation characteristic due to the temperature change.

According to the invention of claim 3, claim 1
Alternatively, in addition to the effect of the invention described in 2, the interruption of the interruption means is controlled based on the current value of the electric current flowing through each of the branch electric wires and the interruption sequence information. It is possible to quickly cut off the breaking means to be cut off based on the current value. Therefore, it is not necessary to provide a device for detecting the current value with respect to the trunk wire, so that the cost of the device can be reduced.

According to the invention of claim 4, claim 1
In addition to the effect of the invention described in any one of 1 to 3, when an overcurrent state in the trunk line is detected, warning information for outputting a warning to the driver etc. is output. It is possible to inform the driver etc. that the power will be cut off. Furthermore, if the configuration is such that it has information instructing a coping method for avoiding an overcurrent state, it is possible to cause the driver or the like to stop using the load. Therefore, there is an effect that the driver or the like can promptly recognize that the electric power to the load is stopped when the trunk electric wire is in the overcurrent state.

According to the invention of claim 5, claim 1
In addition to the effect of the invention described in any one of to 4, the change in the normal state from the overcurrent state is monitored after the overcurrent state in the trunk line is detected, and when the change is detected, the load that can be restored is detected. Since only the supply of electric power is restarted, it is possible to prevent the trunk wire from returning to the overcurrent state due to the restart of the supply of electric power. Therefore, when the trunk wire returns to the normal state, the load that can be restored is quickly restored, and thus there is an effect that it is possible to further thin the trunk wire.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of a vehicle power supply device of the invention.

FIG. 2 is a configuration diagram showing a schematic configuration of a vehicle power supply device according to the present invention.

FIG. 3 is a configuration diagram showing an example of a schematic configuration of an IPS.

FIG. 4 is a diagram showing an example of a memory map of the EEPROM shown in FIG. 2 according to the present invention.

FIG. 5 is a graph showing smoke generation characteristics of a trunk wire.

FIG. 6 is a flowchart showing an example of an outline of processing according to the present invention performed by the CPU of FIG.

FIG. 7 is a diagram for explaining a conventional method for setting a wire size of a trunk wire.

[Explanation of symbols]

1 trunk line 2a to 2c branch electric wire D1 Overcurrent determination information storage means (ROM) D2 Breaking sequence information storage means (EEPROM) P1 Current information generating means (CPU) P2 Overcurrent determination means (CPU) P3 control means (CPU) P4 Temperature information detection means (temperature sensor) P5 alarm information generation means (CPU) P6 Warning information output means (CPU) P7 Change detection means (CPU) P8 Return determination means (CPU)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02J 1/00 304 H02J 1/00 304H (71) Applicant 000204044 Taiheiyo Seiko Co., Ltd. 450 Hinomachi, Ogaki-shi, Gifu Prefecture Address (72) Kunihiko Takeuchi 1360 Kokubutsu, Daito-cho, Ogasa-gun, Shizuoka Inside the Yazaki Parts Co., Ltd. (72) Inventor Tomohisa Masuda 159-1, Kamenoki Fukuke-cho, Toyota-shi, Aichi Inside Yazaki Parts Co., Ltd. ) Inventor Mitsuru Amma 206-1 Nunobikibara, Hara-cho, Haibara-gun, Shizuoka Prefecture, Yazaki Parts Co., Ltd. 1360 Yabu Parts Co., Ltd., Daito-cho, Ogasa-gun, Shizuoka Prefecture In-company (72) Inventor Ichiro Shibata 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd. (72) Inventor Eiichi I 1-1, Showa-cho, Kariya city, Aichi Prefecture, Denso Co., Ltd. (72) Inventor Chiaki Tanaka 1-1, Showa-cho, Kariya city, Aichi prefecture (72) Inventor, Ota Manabu Hinomachi, Ogaki-shi, Gifu prefecture No. 450 Taiheiyo Seiko Co., Ltd. (72) Inventor Hideki Shibata 450 Hinoki-cho, Ogaki-shi, Gifu F-Term (Reference) within Taisei Seiko Co., Ltd. 5G004 AA04 AB03 BA03 BA04 DC04 DC14 EA01 5G065 AA08 EA02 FA01 GA04 GA09 HA07 JA07 KA05 LA02

Claims (5)

[Claims] 1. An overcurrent state occurs when a current having a value lower than a current value at the time of simultaneous supply of all loads flows to a plurality of loads mounted on a vehicle through branch wires connected to each of the loads. A vehicle power supply device that distributes and supplies electric power from a trunk line, wherein the overcurrent determination information storage unit stores overcurrent determination information for determining the overcurrent state in the trunk line, and the load. Shut-off order information storage means for storing shut-off order information indicating the order of shutting off the supply, current information generating means for generating current information indicating the current value of the current flowing through the trunk wire, and for each branch wire A disconnection means is provided, which interrupts the supply of electric power from the branch electric wire to the load, and the current information generated by the current information generation means and the overcurrent determination information stored in the overcurrent determination information storage means. Based on And an overcurrent determining means for determining the overcurrent state, and when the overcurrent determining means determines the overcurrent state, the interrupting means based on the interrupting order information stored in the interrupting order information storage means. An electric power supply apparatus for a vehicle, comprising: 2. A temperature information detecting means for detecting temperature information indicating a temperature affecting smoke emission characteristics of the trunk wire, wherein the overcurrent judging information storing means stores the overcurrent judging information in the trunk wire. It is configured to store the temperature corresponding to the smoke emission characteristics, the overcurrent determination means performs the determination based on the overcurrent determination information corresponding to the temperature information detected by the temperature information detection means. The vehicle electric power supply device according to claim 1. 3. The current information generating means is configured to generate the current information based on a sum of current values of currents flowing through the respective branch electric wires, and the control means further generates the current information generating means. The electric power supply apparatus for a vehicle according to claim 1 or 2, wherein the control is performed based on the current information. 4. The alarm information generating means for generating alarm information for warning that the power to the load will be cut off due to the overcurrent state in response to the overcurrent determination means determining that the overcurrent state is in the overcurrent state. And an alarm information output unit that outputs the alarm information for causing the alarm to be issued based on the alarm information generated by the alarm information generation unit, further comprising: The electric power supply device for a vehicle according to. 5. When the overcurrent determination means determines that the overcurrent state is present, the current information generated by the current information generation means and the overcurrent determination information stored in the overcurrent determination information storage means are detected. Based on the change detection means for detecting a change from the overcurrent state to the normal state based on the above, when the change detection means detects the change, the trunk when the supply of power to the interrupted load is restored. And a return determination unit that determines the load that can be restored from the loads that have cut off the power supply based on the calculation result of the current value in the electric wire, and the control unit. The vehicle power supply device according to any one of claims 1 to 4, wherein the shutoff unit corresponding to the determination result of the return determination unit restarts the supply.