Nissan Altima HL32 Hybrid. Manual - part 537

DIAGNOSIS AND REPAIR WORKFLOW

HBB-5

< BASIC INSPECTION >

D

E

F

G

H

I

J

K

L

M

A

B

HBB

N

O

P

WORKSHEET SAMPLE

JMCIA0171GB

HBB-6

< FUNCTION DIAGNOSIS >

HYBRID BATTERY SYSTEM

FUNCTION DIAGNOSIS

HYBRID BATTERY SYSTEM

System Diagram

INFOID:0000000004212231

JMCIA0119GB

HYBRID BATTERY SYSTEM

HBB-7

< FUNCTION DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBB

N

O

P

System Description

INFOID:0000000004212232

GENERAL

• The hybrid vehicle control ECU detects the amount of effort applied to the accelerator pedal in accordance

with the signals provided by the accelerator pedal position sensor. The hybrid vehicle control ECU receives

signals from the speed sensor (resolver) in the MG1 and MG2, and detects the shift position signal from the

shift position sensor. The hybrid vehicle control ECU determines the driving conditions of the vehicle in

accordance with these pieces of information, and optimally controls the motive forces of MG1, MG2, and the

engine. Furthermore, the hybrid vehicle control ECU optimally controls the output and torque of these motive

forces in order to realize lower fuel consumption and cleaner exhaust emissions.

• The hybrid vehicle control ECU calculates the engine motive force based on the calculated target motive

force, and by taking the SOC and the temperature of the HV battery module into consideration. The value

obtained by subtracting the engine motive force from the target motive force is the MG2 motive force.

• The hybrid vehicle control ECU sends the target engine motive force signal and the target engine speed sig-

nal to the ECM through CAN communication line. The ECM optimally controls the electric throttle control

actuator and sends the actual engine speed signal to the hybrid vehicle control ECU. Furthermore, the

hybrid vehicle control ECU appropriately operates MG1 and MG2 in order to realize the required MG2

motive force. 

JMCIA0120GB

HBB-8

< FUNCTION DIAGNOSIS >

HYBRID BATTERY SYSTEM

NOTE:

• Inverter water pump is also called water pump with motor and bracket assembly in this service manual.

• Generator is also called MG1 or motor generator No.1 in this service manual.

• Traction motor is also called MG2 or motor generator No.2 drive motor in this service manual.

• Inverter assembly is also called inverter with converter assembly inverter in this service manual.

• Hybrid vehicle converter (DC/DC converter) is also just called DC/DC converter in this service manual.

SYSTEM MONITORING CONTROL

• The hybrid vehicle control ECU constantly monitors the SOC (state of charge) of the HV battery. When the

SOC is below the lower level, the hybrid vehicle control ECU increases the power output of the engine to

operate MG1, which charges the HV battery. When the engine is stopped, MG1 operates to start the engine,

then the engine operates MG1 to charge the HV battery.

• If the SOC is low, or the temperature of the HV battery module, MG1 or MG2 is higher than the specified

value, the hybrid vehicle control ECU restricts the motive force applied to the drive wheels until it is restored

to the normal value.

SHUT DOWN CONTROL

The MG1 and MG2 are shut down when the shift position is in the N position. This is because MG1 and MG2

must be stopped electrically as a means of shutting down the motive force, since MG2 is mechanically joined

to the front wheels.

BATTERY SMART UNIT CONTROL

• The battery smart unit monitors the HV battery condition signals (voltage, current and temperature), which

are needed to determine the charging or discharging values that are calculated by the hybrid vehicle control

ECU and transmits them to the hybrid vehicle control ECU via serial communication.

• A leakage detection circuit is provided in the battery smart unit in order to detect any leakage from the HV

battery.

JMCIA0084GB