Vehicle power supply

• US 20040207205A1
• Filed: 04/08/2004
• Published: 10/21/2004
• Est. Priority Date: 04/15/2003
• Status: Abandoned Application

• Current Assignee: Isuzu Motors Limited
• Original Assignee: Isuzu Motors Limited
• Inventors: Kikuchi, Takeshi, Uematsu, Yutaka
• Application Number:
  US10/819,908
• Publication Number:
  US 20040207205A1
• Time in Patent Office: Days
• US Class Current: 290/40C
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A vehicle power supply for a hybrid-powered electric automobile is adapted to feed power to a motor-generator or regenerate power therefrom, and the motor-generator is caused to serve to produce vehicle-driving power. The vehicle power supply of the invention includes two power supplies having an electric storage device respectively. Discharge or regeneration is controlled so that one electric storage device is always maintained in a highly charged condition and the other electric storage device is always maintained nearly in an empty condition. Thus, a margin of regeneration is always kept, so that full use can be made of the regenerative brake whenever the use of the brake is required.

Claims

1. :

A vehicle power supply which feeds power to a motor-generator and an auxiliary equipment or regenerates power from the motor-generator, comprising;

a first power supply having a first electric storage device and a first inverter;

a second power supply having a second electric storage device and a second inverter;

state-of-charge detecting means for detecting the state-of-charge of each of the first and second electric storage devices; and

controlling means for performing feeding control or regeneration control on the first and second power supplies in accordance with signals from the state-of-charge detecting means and signals on an operating status of a vehicle, wherein the regeneration control is performed such that the first power supply regenerates power for preference when the state-of-charge of the first electric storage device is less than a predetermined high state-of-charge threshold, and the second power supply regenerates power for preference when the state-of-charge of the first electric storage device is not less than the predetermined high state-of-charge threshold, and the feeding control is performed such that, the second power supply feeds power for preference when the state-of-charge of the second electric storage device is not less than a predetermined low state-of-charge threshold, and the first power supply feeds power for preference when the state-of-charge of the second electric storage device is less than the predetermined low state-of-charge threshold.

4. :

A vehicle power supply according to claim 1, wherein at least one of the electric storage devices contained in the power supplies comprises an electric double layer capacitor.

2. :

A vehicle power supply which feeds power to a motor-generator and an auxiliary equipment or regenerates power from the motor-generator, comprising;

a first power supply having a first electric storage device and a first inverter;

a second power supply having a second electric storage device and a second inverter;

state-of-charge detecting means for detecting the state-of-charge of each of the first and second electric storage devices; and

controlling means for performing feeding control or regeneration control on the first and second power supplies in accordance with signals from the state-of-charge detecting means and signals on an operating status of a vehicle, wherein the regeneration control is performed such that, the first power supply alone regenerates power when the state-of-charge of the first electric storage device is less than a predetermined high state-of-charge threshold, and the second power supply alone or the first and second power supplies regenerate power when the state-of-charge of the first electric storage device is not less than the predetermined high state-of-charge threshold, and the feeding control is performed such that, the second power supply alone feeds power when the state-of-charge of the second electric storage device is not less than a predetermined low state-of-charge threshold, and the first power supply alone or the first and second power supplies feed power when the state-of-charge of the second electric storage device is less than the predetermined low state-of-charge threshold.

3. :

A vehicle power supply according to claim 2, wherein at least one of the electric storage devices contained in the power supplies comprises an electric double layer capacitor.