Vehicle power supply system

Patent metadata

Field	Value
Publication number	US-11413963-B2
Application number	US-202016742992-A
Country	US
Kind code	B2
Filing date	Jan 15, 2020
Priority date	Jan 30, 2019
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A power supply system for a vehicle includes a high-voltage battery that supplies electric power to an on-vehicle motor, a low-voltage battery that supplies electric power to a plurality of on-vehicle auxiliary machines, a DC/DC converter that changes voltage of an output from the high-voltage battery and supplies the resulting output to the low-voltage battery, and a controller that detects a working state of at least one of the plurality of on-vehicle auxiliary machines and controls operation of the DC/DC converter in accordance with the detected working state.

First claim

The invention claimed is:

1. A power supply system for a vehicle, comprising:
a high-voltage battery that supplies electric power to an on-vehicle motor;
a low-voltage battery that supplies electric power to a plurality of on-vehicle auxiliary machines;
a DC/DC converter that changes voltage of an output of the high-voltage battery and supplies a resulting output to the low-voltage battery; and
a controller that:
detects a working state of at least one on-vehicle auxiliary machine of the plurality of on-vehicle auxiliary machines and controls operation of the DC/DC converter in accordance with the working state that is detected;
performs voltage feedback control with respect to the DC/DC converter in accordance with an output voltage of the DC/DC converter, wherein
the at least one on-vehicle auxiliary machine includes electric power steering and an electrically controlled brake system; and
when at least one of working signals of the electric power steering and the electrically control brake system is detected, raises control gain of the DC/DC converter.

2. The power supply system according to claim 1 , wherein
the controller detects the working state of the electric power steering based on a working signal of the electric power steering.

3. The power supply system according to claim 1 , wherein
the controller detects the working state of the electrically controlled brake system based on a working signal of the electrically controlled brake system.

4. The power supply system according to claim 1 , wherein
the controller detects the working state of the electric power steering based on a working signal of the electric power steering and detects the working state of the electrically controlled brake system based on a working signal of the electrically controlled brake system.

5. The power supply system according to claim 1 , wherein
when at least one of the plurality of on-vehicle auxiliary machines is working, the controller performs current feedback control with respect to the DC/DC converter in accordance with an output current of the DC/DC converter, a target output current of the current feedback control being obtained by adding working currents of the at least one on-vehicle auxiliary machine that is working.

6. The power supply system according to claim 1 , wherein
the controller performs feedback control with respect to the DC/DC converter in accordance with the output voltage and an output current of the DC/DC converter, a target output current of the feedback control being obtained by adding working currents of the at least one on-vehicle auxiliary machine that is working.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nagamoto Makoto

Classifications

• B60R16/03

  for supply of electrical power to vehicle subsystems {or for (circuit arrangements for charging batteries H02J7/00)} · CPC title

• B62D5/0457

  characterised by control features of the drive means as such · CPC title

• B60L1/12 Primary

  Methods and devices for control or regulation · CPC title

• H02M3/157

  with digital control · CPC title

• H02M3/156

  with automatic control of output voltage or current, e.g. switching regulators · CPC title