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. When idling or driving at a constant speed, this system regulates the generated voltage in order to place the current integrated value close to the target value.
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:
Low battery capacity
Low or high battery temperature
Wipers operating, blower motor operating (over high load), or taillight relay ON
Battery current sensor or battery temperature sensor malfunction
Communication failure (LIN between generator assembly and ECM)
Generator assembly malfunction
Engine started
Battery charged for approximately 3 hour
Accumulated driving time become approximately 20 hour
Voltage sensing failure