Charging System: Description and Operation
CHARGING SYSTEMSystem Description
The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to generator terminal 3 through
- 10 A fuse (No. 30, located in the fuse and fusible link box).
Terminal 1 supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is controlled by the IC regulator at terminal 3 detecting the input voltage. A pulse width modulated (PWM) signal is sent from terminal 37 of the IPDM E/R to terminal 4 of the generator. The ECM determines the duty cycle of the power generation variable voltage control system. The charging circuit is protected by the 140 A fusible link [letter a, located in the fusible link box (battery)].
The generator is grounded through the engine.
With the ignition switch in the ON or START position, power is supplied
- through 10 A fuse [No. 14, located in the fuse block (J/B)]
- to combination meter terminal 24 for the charge warning lamp.
Ground is supplied to terminal 13 of the combination meter through terminal 2 of the generator. With power and ground supplied, the charge warning lamp will illuminate. When the generator is providing sufficient voltage with the engine running, the ground is opened and the charge warning lamp will go off. If the charge warning lamp illuminates with the engine running, a fault is indicated. The IC regulator warning function activates to illuminate "CHARGE" warning lamp, if any of the following symptoms occur while generator is operating:
- Excessive voltage is produced.
- No voltage is produced.
POWER GENERATION VARIABLE VOLTAGE CONTROL SYSTEM
NOTE: Power generation variable voltage control system has been adopted. By varying the voltage to the generator, engine load due to power generation of the generator is reduced and fuel consumption is decreased.
Operation
- The battery current sensor detects the charging/discharging current of the battery. ECM judges the battery condition based on this signal.
- ECM judges whether to control voltage according to the battery condition.
- ECM calculates the target power generation voltage according to the battery condition and sends the calculated value, through CAN lines, as the power generation command value to IPDM E/R.
- IPDM E/R converts the received power generation command value into the power generation command signal (PWM signal) and sends it to the IC regulator.
- The IC regulator performs final control over the power generation voltage.
- When there is no power generation command signal, the generator performs the normal power generation according to the characteristic of the IC regulator.
NOTE: When any malfunction is detected in the power generation variable voltage control system, power generation is performed according to the characteristic of the IC regulator in the generator.
Component
BATTERY CURRENT SENSOR
- Battery current sensor is installed to the negative battery cable and it detects the charging/discharging current of the battery and sends the voltage signal to ECM according to the current value.