System Description: Description

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

General

The Hybrid Vehicle Control system optimally effects cooperative control of a QR25DE engine and a high-speed, high-output MG2 through a hybrid transaxle that provides excellent transmission performance.

Furthermore, it uses a variable-voltage system consisting of a high-output HV battery with a nominal voltage of DC 244.8 V, and a boost converter that boosts the operating voltage of the system to a maximum voltage of DC 650 V.

NOTE:

Inverter water pump is also called water pump with motor and bracket assembly in this service information.
Generator is also called MG1 or motor generator No. 1 in this service information.
Traction motor is also called MG2 or motor generator No. 2 in this service information.
Inverter assembly is also called inverter with converter assembly in this service information.
Hybrid vehicle converter (DC/DC converter) is also just called DC/DC converter in this service information.

Driving Performance

This system uses a variable-voltage system that consists of a boost converter to boost the operating voltage to a maximum voltage of DC 650 V. It is able to drive the MG1 (Motor Generator No. 1) and MG2 (Motor Generator No. 2) at a high voltage, and minimizes the electrical loss associated with the supply of electric power at a smaller current. Thus, it is able to operate the MG1 and MG2 at high speeds and high outputs.

A high driving force is achieved through the synergy effect of the high-speed, high-output MG2 and the high-efficiency QR25DE engine.

Fuel Economy Performance

By optimizing the internal construction of MG2, this system realizes a high level of regenerative capability, thus realizing a high level of fuel economy performance.
This system stops the engine while the vehicle is idling, and stops the engine as much as possible under conditions in which the operating efficiency of the engine is poor, allowing the vehicle to operate using only MG2. Under the conditions in which the operating efficiency of the engine is favorable, the engine operates to drive the vehicle using MG1 while generating electricity. Thus, this system effects the input-output control of driving energy in a highly efficient manner to realize a high level of fuel economy.