Power-generation control device and power-generation control method for hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2016009272-A1
Application number	US-201514601323-A
Country	US
Kind code	A1
Filing date	Jan 21, 2015
Priority date	Jul 9, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

Provided is a power-generation control device and a power-generation control method for a hybrid vehicle, which are capable of suppressing a temperature rise of an electric motor while controlling a field-weakening current to flow through the electric motor to protect the electric motor and a battery even when an induced voltage increased by an increase in rpm of the electric motor exceeds an allowable voltage of the battery. Power generation by an electric motor is stopped when a voltage of a battery is equal to or higher than a predetermined first voltage, and an in-vehicle electric load is supplied with power generated by the electric motor and a power-generation amount by the electric motor is controlled so that the voltage of the battery becomes equal to a predetermined second voltage, when the voltage of the battery is lower than the predetermined second voltage.

First claim

What is claimed is:

1 . A power-generation control device for a hybrid vehicle, comprising:
a control section for controlling a power-generation system of the hybrid vehicle, the power-generation system comprising: an internal combustion engine; an electric motor coupled to an output shaft of the internal combustion engine, which is capable of generating power; a battery for accumulating the power generated by the electric motor; and an in-vehicle electric load to be supplied with the power from the battery; and a battery-state detecting section for detecting a voltage of the battery, wherein the control section stops the power generation by the electric motor when the voltage of the battery, which is detected by the battery-state detecting section, is equal to or higher than a predetermined first voltage, and supplies the in-vehicle electric load with the power generated by the electric motor and controls a power-generation amount by the electric motor so that the voltage of the battery becomes equal to a predetermined second voltage, which is lower than the predetermined first voltage, when the voltage of the battery is lower than the predetermined second voltage.

2 . A power-generation control device for a hybrid vehicle according to claim 1 , further comprising:
an electric-motor temperature detecting section for detecting a temperature of the electric motor; and an electric-load detecting section for detecting a load of the in-vehicle electric load, wherein the control section limits power consumed by the in-vehicle electric load in accordance with the load of the in-vehicle electric load, which is detected by the electric-load detecting section, when the temperature of the electric motor, which is detected by the electric-motor temperature detecting section, is equal to or higher than a predetermined first temperature in a state in which the voltage of the battery is lower than the predetermined second voltage.

3 . A power-generation control device for a hybrid vehicle according to claim 1 , further comprising:
an electric-motor temperature detecting section for detecting a temperature of the electric motor; and an internal-combustion-engine rpm detecting section for detecting an rpm of the internal combustion engine, wherein the control section controls the internal combustion engine so that the rpm of the internal combustion engine, which is detected by the internal-combustion-engine rpm detecting section, becomes lower than a predetermined rpm when the temperature of the electric motor, which is detected by the electric-motor temperature detecting section, is equal to or higher than a predetermined first temperature in a state in which the voltage of the battery is lower than the predetermined second voltage.

4 . A power-generation control device for a hybrid vehicle according to claim 1 , further comprising:
an electric-motor temperature detecting section for detecting a temperature of the electric motor; an electric-load detecting section for detecting a load of the in-vehicle electric load; and an internal-combustion-engine rpm detecting section for detecting an rpm of the internal combustion engine, wherein the control section limits power consumed by the in-vehicle electric load in accordance with the load of the in-vehicle electric load, which is detected by the electric-load detecting section, and controls the internal combustion engine so that the rpm of the internal combustion engine, which is detected by the internal-combustion-engine rpm detecting section, becomes lower than a predetermined rpm when the temperature of the electric motor, which is detected by the electric-motor temperature detecting section, is equal to or higher than a predetermined first temperature in a state in which the voltage of the battery is lower than the predetermined second voltage.

5 . A power-generation control device for a hybrid vehicle according to claim 2 , further comprising a water-cooling system for cooling the electric motor,
wherein the control unit cools the electric motor by using the water-cooling system when the temperature of the electric motor is equal to or higher than the predetermined first temperature in a state in which the voltage of the battery is lower than the predetermined second voltage.
than the predetermined second voltage.

6 . A power-generation control device for a hybrid vehicle according to claim 3 , further comprising a water-cooling system for cooling the electric motor,
wherein the control unit cools the electric motor by using the water-cooling system when the temperature of the electric motor is equal to or higher than the predetermined first temperature in a state in which the voltage of the battery is lower than the predetermined second voltage.
than the predetermined second voltage.

7 . A power-generation control device for a hybrid vehicle according to claim 4 , further comprising a water-cooling system for cooling the electric motor,
wherein the control unit cools the electric motor by using the water-cooling system when the temperature of the electric motor is equal to or higher than the predetermined first temperature in a state in which the voltage of the battery is lower than the predetermined second voltage.

8 . A power-generation control device for a hybrid vehicle according to claim 2 , further comprising a memory section for storing a map which defines a relationship between the temperature of the electric motor and each of the predetermined first voltage and the predetermined second voltage,
wherein the predetermined first voltage and the predetermined second voltage are determined in accordance with the temperature of the electric motor by referring to the map.

9 . A power-generation control device for a hybrid vehicle according to claim 3 , further comprising a memory section for storing a map which defines a relationship between the temperature of the electric motor and each of the predetermined first voltage and the predetermined second voltage,
wherein the predetermined first voltage and the predetermined second voltage are determined in accordance with the temperature of the electric motor by referring to the map.

10 . A power-generation control device for a hybrid vehicle according to claim 4 , further comprising a memory section for storing a map which defines a relationship between the temperature of the electric motor and each of the predetermined first voltage and the predetermined second voltage,
wherein the predetermined first voltage and the predetermined second voltage are determined in accordance with the temperature of the electric motor by referring to the map.

11 . A power-generation control device for a hybrid vehicle according to claim 8 , wherein the predetermined first voltage and the predetermined second voltage of the map stored in the memory section have hysteresis.

12 . A power-generation control device for a hybrid vehicle according to claim 9 , wherein the predetermined first voltage and the predetermined second voltage of the map stored in the memory section have hysteresis.

13 . A power-generation control device for a hybrid vehicle according to claim 10 , wherein the predetermined first voltage and the predetermined second voltage of the map stored in the memory section have hysteresis.

14 . A power-generation control device for a hybrid vehicle according to claim 1 , further comprising an electric-motor control unit, which being an inverter for controlling the electric motor,
wherein the control section switches a mode of the electric-motor control unit to one of a short-circuit mode and an ope

Assignees

• Mitsubishi Electric Corp

Inventors

• Tanaka Hideyuki
• Watanabe Masutaka

Classifications

• B60W2510/244

  Charge state · CPC title

• B60W30/1843

  Overheating of driveline components (B60W30/186 takes precedence) · CPC title

• B60K6/48 Primary

  Parallel type · CPC title

• Y10S903/903

  having energy storing means, e.g. battery, capacitor · CPC title

• B60W20/15

  Control strategies specially adapted for achieving a particular effect · CPC title