Vehicle battery controller

摘要

The vehicle battery controller shown in Figure 1 includes a contactor (4) for interconnecting an auxiliary battery (2) to a main battery (3) for engine starting or charging. If the auxiliary battery voltage is lower than a first threshold before engine starting its subsequent use is inhibited. If the main battery voltage exceeds the auxiliary battery voltage by more than a predetermined margin, the auxiliary battery (2) is not used for engine starting. When the engine is running and the charging system (10) is operating, the auxiliary battery is disconnected when the common voltage drops below a second threshold.