On-vehicle electric power control system, control device, and aggregated control device
The influence of a power supply voltage drop due to a wire diameter reduction of a wire harness is suppressed, and the operation guarantee voltages of components 501 to 503 connected to the wire harness are appropriately secured. An on-vehicle electric power control system 1 includes a low-voltage battery 50 , a first control device 100 , and components 501 to 503 . The first control device 100 acquires wiring resistance values of power supply lines of a third power supply line 60 , a fourth power supply line 80 , and a fifth power supply line 90 , acquires a current value supplied to the components 501 to 503 , and calculates a voltage drop amount in the power supply line based on the acquired wiring resistance value and current value. Then, a correction value for correcting the output voltage of the DC-DC converter 30 is determined based on the calculated voltage drop amount, and a correction request indicating the determined correction value is transmitted to a second control device 200.
1 . An on-vehicle electric power control system comprising:
a power supply device;
a control device connected to the power supply device via a first power supply line; and
one or a plurality of loads connected to the control device via a second power supply line, wherein
the control device includes:
wiring resistance acquiring means for acquiring wiring resistance values of the first power supply line and the second power supply line;
current acquiring means for acquiring a first current value supplied to the control device via the first power supply line and a second current value supplied to the load via the second power supply line;
voltage drop amount calculating means for calculating voltage drop amounts in the first power supply line and the second power supply line based on the wiring resistance value acquired by the wiring resistance acquiring means, the first current value acquired by the current acquiring means, and the second current value acquired by the current acquiring means;
correction value determining means for determining 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 calculating means; and
correction request output means for outputting a correction request indicating the correction value determined by the correction value determining means.
2 . The on-vehicle electric power control system according to claim 1 , further comprising:
a power supply voltage control device that controls an output voltage of the power supply device, wherein
the correction request output means outputs the correction request to the power supply voltage control device, and
the power supply voltage control device controls an output voltage of the power supply device according to the correction request.
3 . The on-vehicle electric power control system according to claim 1 , wherein
the voltage drop amount calculating means calculates the voltage drop amount based on a temperature estimation value of the first power supply line or the second power supply line.
4 . The on-vehicle electric power control system according to claim 2 , wherein
a plurality of the control devices are provided for each zone of a vehicle, and
each correction request output means of the plurality of control devices outputs the correction request for correcting an output voltage of the power supply device.
5 . The on-vehicle electric power control system according to claim 4 , further comprising:
an aggregated control device that receives a plurality of the correction requests output from the correction request output means of the plurality of control devices, wherein
the aggregated control device outputs the correction request selected from among a plurality of the correction requests to the power supply voltage control device, and
the power supply voltage control device controls an output voltage of the power supply device according to the selected correction request.
6 . The on-vehicle electric power control system according to claim 5 , wherein
the aggregated control device selects the correction request indicating a highest voltage value from among a plurality of the correction requests.
7 . The on-vehicle electric power control system according to claim 4 , wherein
one of the plurality of control devices receives one or a plurality of the correction requests output from the correction request output means of other one or a plurality of control devices, and
the one control device outputs, to the power-supply voltage control device, the correction request selected from among the correction request output from the correction request output means of the one control device and the other one or plurality of correction requests output from the correction request output means of the other one or plurality of control devices, and
the power supply voltage control device controls an output voltage of the power supply device according to the selected correction request.
8 . The on-vehicle electric power control system according to claim 7 , wherein
the one control device selects the correction request indicating a highest voltage value from among the plurality of correction requests.
9 . The on-vehicle electric power control system according to claim 4 , wherein
the plurality of control devices are connected by a ring topology.
10 . The on-vehicle electric power control system according to claim 9 , wherein
the plurality of control devices connected by a ring topology output a first correction request indicating a correction value determined based on a voltage drop amount in a first power supply voltage supply path and a second correction request indicating a correction value determined based on a voltage drop amount in a second power supply voltage supply path different from the first power supply voltage supply path.
11 . The on-vehicle electric power control system according to claim 1 , further comprising:
warning means for giving a warning as a precursor of a failure in a case where a value indicated by the correction request is out of a predetermined range.
12 . The on-vehicle electric power control system according to claim 11 , wherein
an upper limit value of the predetermined range is a minimum value of absolute maximum ratings of the one or plurality of loads, and a lower limit value of the predetermined range is a maximum value of minimum operation guarantee voltages of the one or plurality of loads.
13 . The on-vehicle electric power control system according to claim 2 , wherein
the power supply voltage control device masks a new correction request after receiving the correction request until an output voltage of the power supply device according to the correction request is stabilized.
14 . The on-vehicle electric power control system according to claim 1 , wherein
the load includes a priority load related to basic performance of a vehicle, and
the correction value determining means determines the correction value based on the voltage drop amount and an operation guarantee voltage of the priority load.
15 . A control device of an on-vehicle electric power control system connected to a power supply device via a first power supply line and connected to one or a plurality of loads via a second power supply line, the control device comprising:
wiring resistance acquiring means for acquiring wiring resistance values of the first power supply line and the second power supply line;
current acquiring means for acquiring a first current supplied to the control device via the first power supply line and a second current supplied to the load via the second power supply line;
voltage drop amount calculating means for calculating voltage drop amounts in the first power supply line and the second power supply line based on the wiring resistance value acquired by the wiring resistance acquiring means, the first current acquired by the current acquiring means, and the second current acquired by the current acquiring means;
correction value determining means for determining 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 calculating means; and
correction request output means for outputting a correction request indicating the correction value determined by the correction value determining means.
16 . An aggregated control device communicably connected to a plurality of control devices according to claim 15 , wherein
the correction request selected from among the plurality of correction requests output from the correction request output means of the plurality of control devices is output to a power supply voltage control device that controls an output voltage of the power supply device.