| US 7,554,297 B2 | ||
| Automotive battery state monitor apparatus | ||
| Takeshi Sada, Toyota (Japan); Makoto Taniguchi, Obu (Japan); and Atsushi Ichikawa, Toyoake (Japan) | ||
| Assigned to Denso Corporation, Kariya (Japan) | ||
| Filed on Jul. 17, 2007, as Appl. No. 11/826,627. | ||
| Application 11/826627 is a division of application No. 10/868921, filed on Jun. 17, 2004, granted, now 7,317,300. | ||
| Claims priority of application No. 2003-178131 (JP), filed on Jun. 23, 2003; and application No. 2003-180972 (JP), filed on Jun. 25, 2003. | ||
| Prior Publication US 2007/0257641 A1, Nov. 08, 2007 | ||
| Int. Cl. H02J 7/00 (2006.01) | ||
| U.S. Cl. 320—132 [324/429] | 11 Claims |
| 1. An automotive battery state monitor apparatus comprising:
an automotive generator driven by an engine;
a controlling device that controls the generator;
an automotive battery to store electricity generated by the generator;
means for measuring a period of time, which elapses from a completion of starting of an engine;
means for comparing the period of time measured by the measuring means with a predetermined period of time;
means for stopping the automotive generator temporarily during running of the engine to put polarization of the battery in
a discharge condition, when the means for comparing indicates that the measured period of time reaches the predetermined period
of time;
means for increasing an output of the generator gradually after stopping the generator and after the polarization of the battery
is put in the discharge condition; and
means for picking up a battery voltage value as an open circuit voltage of the battery when a battery charge/discharge current
reaches within a predetermined small range near zero.
|