Nissan Maxima Service and Repair Manual: Power generation voltage variable control system

Nissan Maxima Service and Repair Manual / Power outlet / Charging system / System description / Power generation voltage variable control system

System Diagram

Nissan Maxima. System Diagram

System Description

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.

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 Description

Component part

Description

Battery current sensor The battery current sensor is installed on the battery cable at the negative terminal. The battery current sensor detects the charging/ discharging current of the battery and sends a voltage signal to the ECM according to the current value detected.
ECM The battery current sensor detects the charging/discharging current of the battery. The ECM judges the battery condition based on this signal.

The ECM judges whether to request more output via the power generation voltage variable control according to the battery condition.

When performing the power generation voltage variable control, the ECM calculates the target power generation voltage according to the battery condition and sends the calculated value as the power generation command value to the IPDM E/R.

IPDM E/R The IPDM E/R converts the received power generation command value into a pulse width modulated (PWM) command signal and sends it to the IC regulator
Generator (IC regulator) The IC regulator controls the power generation voltage by the target power generation voltage based on the received PWM command signal.

When there is no PWM command signal, the generator performs the normal power generation according to the characteristic of the IC regulator.

    Charging system

    DTC/circuit diagnosis