# US 7,607,411 B2 · Vehicular power supply apparatus

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- Number: US 7,607,411 B2
- Document ID: US7607411B2
- Status: Granted
- Kind: B2
- Application number: 12/169,045
- Filed: 2008-07-08
- Published: 2009-01-15
- Granted: 2009-10-27
- Earliest claimed: 2007-07-09
- Assignees: Fuji Jukogyo Kabushiki Kaisha
- Inventors: Seiichi Ishizeki
- Web page: https://patentgrep.com/patent/US7607411B2

## CPC

- F02N 11/0814: {comprising means for controlling automatic idle-start-stop}
- F02N 11/0866: {comprising several power sources, e.g. battery and capacitor or two batteries}
- F02N 11/10: Safety devices (F02N11/08 takes precedence)
- F02N 11/087: {Details of the switching means in starting circuits, e.g. relays or electronic switches}
- F02N 2011/0885: {Capacitors, e.g. for additional power supply}
- F02N 2200/022: Engine speed
- F02N 2200/044: Starter current
- F02N 2200/0814: Bonnet switches
- Y02T 10/40: Engine management systems
- F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A vehicular power supply apparatus includes a capacitor, an idling stop means for stopping an engine at a halt of the vehicle and restarting the engine at driver's preset driving operation by supplying current to an engine starter with the capacitor, a current detecting means for detecting the current, a cumulative value calculating means for calculating cumulative value of the current on the basis of the detected current after starting of the engine starter until a set time elapses, and an abnormality determining means for determining, when engine revolution speed at the time the set time has elapsed is outside a preset range and the cumulative value is equal to or less than a preset value, that the capacitor is abnormal.

## Claims

### Claim 1

A vehicular power supply apparatus comprising:
capacitor;
idling stop means for stopping an engine at a halt of the vehicle and restarting the engine at a driver's preset driving operation by supplying a current to an engine starter with the capacitor;
current detecting means for detecting the current;
cumulative value calculating means for calculating a cumulative value of the current on the basis of the detected current after starting of the engine starter until a set time elapses; and
abnormality determining means for determining, when an engine revolution speed at the time the set time has elapsed is outside a preset range and the cumulative value is equal to or less than a preset value, that the capacitor is abnormal.

### Claim 2 (depends on 1)

The vehicular power supply apparatus according to claim 1, wherein, in a case where the engine is in a state before being warmed-up when the engine starter is started, the abnormality determining means does not determine whether or not the capacitor is abnormal.

### Claim 3 (depends on 1)

The vehicular power supply apparatus according to claim 1, further comprising a battery, wherein the idling stop means supplies the current to the engine starter with both the capacitor and the battery when the engine is restarted.