SYSTEM CONTROL
This system lowers the generated voltage when the vehicle is not decelerating, and raises the generated voltage when the vehicle is decelerating. This reduces the load on the engine as a result of electric generation of the generator, thus contributing to improved fuel economy.
This control consists of the battery current sensor assembly, battery temperature sensor, generator assembly, ECM, various sensors and switches.
The ECM detects the driving conditions based on signals from various sensors and switches. The ECM detects the charging condition based on signals from the generator assembly, battery current sensor and battery temperature sensor. The ECM determines the vehicle driving conditions, and based on this information, the ECM sends a voltage request signal to the generator assembly.
The ECM stops charging control and the generator switches to the constant voltage generation mode under the following conditions:
| Item | Conditions | Intention | Vehicle behavior |
|---|---|---|---|
| Battery capacity has decreased | When battery capacity has decreased | When the condition of the battery is bad, charging control is suspended to prevent a decrease in battery charge. If the battery temperature is too low or too high, the battery capacity and lifespan may decrease. | Charging control is prohibited→Generator operates in constant voltage mode |
| Battery temperature guard | When battery temperature is low or high | ||
| Operating with electrical load | When there is a high load such as when the tail light switch is on or the wipers or blower motor operating over high load. | To avoid discomfort caused by voltage fluctuations in the power supply (maintain saleability and provide stable power). | |
| Sensor malfunction |
|
When there is a sensor malfunction, charging control is suspended to prevent a decrease in battery charge. | Charging control is prohibited→Generator operates in constant voltage mode (Autonomous generation mode) |