| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a battery temperature estimation device capable of accurately estimating battery temperature in various vehicle operating conditions. <P>SOLUTION: In operating a vehicle, a battery ambient temperature estimate value is set (S6) from a battery ambient temperature estimate value map according to an engine output, an intake air temperature, a vehicle speed, and ON/OFF state of an air conditioner, a temperature change coefficient is set (S7) from a temperature change coefficient map according to the ON/OFF state of the vehicle speed and a motor fan, and a battery temperature estimate value is periodically calculated and renewed (S8) by the following calculation formula. (Δbattery temperature) = (Δbattery ambient temperature estimate value - previous battery temperature estimate value)×(temperature change coefficient)×(Δt), and (a battery temperature estimate value) = (Δbattery temperature) + (previous battery temperature estimate value), whereΔbattery temperature is the battery temperature change value per unit time, andΔt is a calculation period. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
