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EV System Start-Up Control

WARNING: This page is about a different car, the 2011 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.

VCM judges the operation mode from signals sent by various sensors, switches and ECUs, and control the start/stop of the EV system by activating the relays accordingly. VCM also activates the SSOFF relay so that it can shutoff VCM power when VCM stops (self shutoff).

Power switch ON

Fig 1: EV System Start-Up Control System Diagram (Power Switch On)
G07084044Courtesy of NISSAN MOTOR CO., U.S.A.

When the power ON power supply from the IPDM E/R enters VCM, VCM turns on the M/C relay to supply power to each ECU in the EV system.

READY

Fig 2: EV System Start-Up Control System Diagram (Ready)
G07084045Courtesy of NISSAN MOTOR CO., U.S.A.

When the driver operates the POWER switch while depressing the brake pedal, VCM turns on the M/C relay to supply power to each ECU in the EV system. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

NOTE: VCM inhibits the vehicle is set to READY in following conditions:
  • Charge connector is connected
  • Li-ion battery remaining energy is too low.
  • Li-ion battery temperature is too low. [Approximately -25°C (-13°F)]

In Normal Charging

Fig 3: EV System Start-Up Control System Diagram (In Normal Charging)
G07084046Courtesy of NISSAN MOTOR CO., U.S.A.

If VCM judges that the system is in normal charge mode, VCM turns on the M/C relay to supply power to each ECU in the EV system and to the normal charge relay in the DC/DC junction box. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

NOTE: Normal charging does not start with the power switch ON.

In Quick Charging

Fig 4: EV System Start-Up Control System Diagram (In Quick Charging)
G07084047Courtesy of NISSAN MOTOR CO., U.S.A.

When VCM judges that the system is in quick charge mode, VCM turns on the M/C relay to supply power to each ECU in the EV system. VCM also activates the F/S CHG relay to supply power to the quick charge relay inside DC/DC J/B. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

When Air Conditioner Is Operating (Power OFF)

When VCM receives an air conditioner operation command, VCM turns on the M/C relay to start the EV system. VCM also activates the A/C relay to supply power to the air conditioner system. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

When Automatic 12V Battery Charge Control is Operating

When VCM judges that the 12V battery requires automatic charging, VCM turns on the M/C relay to start the EV system. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

Relay Activation Matrix

POWER ON

RELAY REFERENCE CHART (POWER ON)

Relay Condition
POWER ON READY Charging When 12V battery is charged Timer A/C
Normal charge Quick charge
F/S relay OFF ON ON ON ON ON
M/C relay ON ON ON ON ON ON
A/C relay ON ON ON ON ON ON
F/S CHG relay OFF OFF OFF ON OFF OFF

POWER OFF

RELAY REFERENCE CHART (POWER OFF)

Relay Condition
Charging When 12V battery is charged Timer A/C Remote A/C
Normal charge Quick charge
F/S relay ON ON ON ON ON
M/C relay ON ON ON ON ON
A/C relay OFF OFF OFF ON ON
F/S CHG relay OFF ON OFF OFF ON(1)
(1) Only during quick charging
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