Apparatus for supplying power for a vehicle

• US 7,602,140 B2
• Filed: 10/14/2004
• Issued: 10/13/2009
• Est. Priority Date: 11/11/2003
• Status: Expired due to Fees

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Horii, Hiroaki, Asaumi, Hisao
• Primary Examiner(s): Assouad; Patrick J
• Assistant Examiner(s): Muralidar; Richard V
• Application Number:
  US10/979,657
• Publication Number:
  US 20050099160A1
• Time in Patent Office: 1,825 Days
• Field of Search: 320103-104, 307/10.7
• US Class Current: 320/104
• CPC Class Codes: H02J 7/0019 using switched or multiplexed charge circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034

Abstract

An apparatus for supplying power for a vehicle includes a first battery, a second battery, a switching device, a monitoring device and a control device. The first battery is electrically connected to load devices which are mounted on the vehicle. The second battery serves as a backup power source. The switching device switches the first and second batteries. The monitoring device monitors remaining capacity for each of the first and second batteries. When the control device determines that the remaining capacity of the second battery is less than the remaining capacity of the first battery based on information monitored by the monitoring device, the control device controls the switching device so as to conduct switching of the first and second batteries.

Claims

1. An apparatus for supplying power for a vehicle, comprising:

a first battery electrically connected to load devices which are mounted on the vehicle;

a second battery, wherein when the second battery is a backup power source,

the second battery is electrically isolated from the load devices, and

the second battery is electrically connected to a power generator for charging the second battery;

said first and second batteries being interchangeable;

wherein the first battery, the second battery, and the load devices form a parallel circuit;

switching means for switching the first and second batteries so that when the first and second batteries are switched,

said first battery serves as the backup power source and is electrically isolated from the load devices,

the first battery is electrically connected to the second battery,

the first battery is electrically connected to the power generator mounted on the vehicle for charging the first battery, and

said second battery is electrically connected to the load devices;

a monitoring device for monitoring remaining capacity for each of the first and second batteries;

a control device, wherein when the control device determines that the remaining capacity of the second battery is less than the remaining capacity of the first battery based on information monitored by the monitoring device, the control device controls the switching means so as to conduct switching of the first and second batteries; and

a charge controller that controls charging of the first and second batteries,

wherein a charge voltage applied to the second battery is greater than a charge voltage applied to the first battery.

2. An apparatus according to claim 1, wherein when the vehicle is in operation, the charge controller controls such that one of the power generator and the first battery continuously supplies a predetermined amount of power to the second battery.

3. An apparatus according to claim 1, wherein the charge controller has charge protection against charging of the first battery conducted by the second battery.

4. An apparatus for supplying power for a vehicle, comprising:

a first battery;

a second battery;

a load device;

a power generator;

wherein the first battery, the second battery, and the load devices form a parallel circuit;

switching means for switching between a first state and a second state,

wherein in the first state, the power generator is electrically connected to the first battery and the second battery, and the first battery serves as a main battery and the second battery serves as a sub-battery,

wherein in the second state, the power generator is electrically connected to the first battery and the second battery, and the first battery serves as the sub-battery and the second battery serves as the main battery, and

wherein both in the first state and in the second state, the sub-battery is electrically isolated from the load device;

a monitoring device for monitoring a main remaining capacity of the main battery and a backup remaining capacity of the sub-battery;

a control device that is in communication with the monitoring device,

wherein the control device makes a comparison, wherein the main remaining capacity is compared to the backup remaining capacity,

wherein the control device controls the switching means to switch between the first state to the second state based on the comparison,

a charge controller that controls charging of the main battery and the sub-battery; and

a booster circuit that increases a charge voltage applied to the sub-battery,

wherein the charge voltage applied to the sub-battery is higher than a charge voltage applied to the main battery, and

wherein the booster circuit includes a reverse current protection that prevents current flow to the main battery from the sub-battery.

5. An apparatus according to claim 4, further comprising an emergency switching device which executes switching from the first battery to the second battery when the remaining capacity of the second battery is greater than the remaining capacity of the first battery.

6. An apparatus according to claim 4, wherein the load device comprise a by-wire system for controlling electromechanical components of the vehicle by electric signals.

7. An apparatus according to claim 6, wherein the by-wire system comprises a steer-by-wire system.

8. An apparatus according to claim 6, wherein the by-wire system comprises a brake-by-wire system.

9. The apparatus for supplying power for a vehicle according to claim 4,

wherein the sub-battery is charged by receiving a predetermined power, and

wherein the predetermined power is from the power generator or from the main battery.