POWER SOURCE SYSTEM FOR ELECTRIC POWERED VEHICLE AND CONTROL METHOD THEREOF
First Claim
1. A power source system for an electric powered vehicle equipped with a motor generating vehicle driving power, comprising:
- a main power storage device for storing electric power input to and output from said motor;
a sub power storage device having an output voltage lower than an output voltage of said main power storage device;
a voltage converter configured to convert the output voltage of said main power storage device to a level of the output voltage of said sub power storage device, and output the converted output voltage to said sub power storage device; and
a first controller operated using electric power from said sub power storage device, for monitoring states of charge of said main power storage device and said sub power storage device and controlling operation and stop of said voltage converter,said first controller being configured such that, in a vehicle running state, said first controller is always operated, and always operates said voltage converter to maintain the output voltage of said sub power storage device at a target voltage, and when said electric powered vehicle is in a key-off state, said first controller is intermittently operated, and if the output voltage of said sub power storage device becomes lower than a prescribed voltage during operation, said first controller performs charging processing for said sub power storage device using the electric power of said main power storage device, by operating said voltage converter.
1 Assignment
0 Petitions
Accused Products
Abstract
An electric powered vehicle is equipped with a main battery for storing electric power input to and output from a motor, and an auxiliary battery as a power source for an auxiliary system including a control system. A DC/DC converter converts an output voltage of the main battery to a level of an output voltage of the auxiliary battery. During operation, a BAT-ECU monitors states of charge of the main battery and the auxiliary battery and controls operation/stop of the DC/DC converter. When the electric powered vehicle is in a key-off state (running stop state), the BAT-ECU is intermittently operated, while an external charging system and a vehicle running system are stopped.
50 Citations
17 Claims
-
1. A power source system for an electric powered vehicle equipped with a motor generating vehicle driving power, comprising:
-
a main power storage device for storing electric power input to and output from said motor; a sub power storage device having an output voltage lower than an output voltage of said main power storage device; a voltage converter configured to convert the output voltage of said main power storage device to a level of the output voltage of said sub power storage device, and output the converted output voltage to said sub power storage device; and a first controller operated using electric power from said sub power storage device, for monitoring states of charge of said main power storage device and said sub power storage device and controlling operation and stop of said voltage converter, said first controller being configured such that, in a vehicle running state, said first controller is always operated, and always operates said voltage converter to maintain the output voltage of said sub power storage device at a target voltage, and when said electric powered vehicle is in a key-off state, said first controller is intermittently operated, and if the output voltage of said sub power storage device becomes lower than a prescribed voltage during operation, said first controller performs charging processing for said sub power storage device using the electric power of said main power storage device, by operating said voltage converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A control method for a power source system for an electric powered vehicle equipped with a motor generating vehicle driving power,
said power source system including: -
a main power storage device for storing electric power input to and output from said motor; a sub power storage device having an output voltage lower than an output voltage of said main power storage device; a voltage converter configured to convert the output voltage of said main power storage device to a level of the output voltage of said sub power storage device and output the converted output voltage to said sub power storage device; and a first controller operated using electric power from said sub power storage device, for monitoring states of charge of said main power storage device and said sub power storage device and controlling operation and stop of said voltage converter, said control method comprising the steps of; intermittently operating said first controller when said electric powered vehicle is in a key-off state; obtaining the output voltage of said sub power storage device during intermittent operation of said first controller; and performing, if obtained said output voltage becomes lower than a prescribed voltage, charging processing for said sub power storage device using the electric power of said main power storage device, by operating said voltage converter. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
Specification