Control System for Electric Vehicle, and Electric Vehicle Equipped Therewith

• US 20140236409A1
• Filed: 04/23/2014
• Published: 08/21/2014
• Est. Priority Date: 11/18/2009
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: SAWADA, Itsuro, NASU, Shingo, YOKOYAMA, Atsushi, OSAKA, Tadashi
• Application Number:
  US14/259,609
• Publication Number:
  US 20140236409A1
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/02 to electric heating circuits
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2240/34 Cabin temperature
• CPC Class Codes: B60L 2240/425 Temperature
• CPC Class Codes: B60L 2260/56 Temperature prediction, e.g. for pre-cooling
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A control system for an electric vehicle includes: an electricity storage device that performs charging and discharging of electrical power; a plurality of load devices that receive supply of electrical power from the electricity storage device and perform operations; and a control device that controls the electricity storage device and the plurality of load devices. And when electrical power is supplied from the electricity storage device to the plurality of load devices, the control device calculates a charge/discharge efficiency of the electricity storage device and a working efficiency of each of the load devices, and regulates an amount of electrical power supplied from the electricity storage device to each of the load devices, so as to enhance an overall efficiency of the electricity storage device and the plurality of load devices.

Claims

1. A control system for an electric vehicle, comprising:

an electricity storage device that performs charging and discharging of electrical power;

a plurality of load devices that receive supply of electrical power from the electricity storage device and perform operations of the electric vehicle; and

a control device that controls the electricity storage device and the plurality of load devices, wherein;

when electrical power is supplied from the electricity storage device to the plurality of load devices, the control device calculates a charge/discharge efficiency of the electricity storage device and a working efficiency of each of the load devices, and regulates an amount of electrical power supplied from the electricity storage device to each of the load devices, so as to enhance an overall efficiency of the electricity storage device and the plurality of load devices;

an electric machine for propelling the electric vehicle and a temperature regulation device that performs air conditioning of an interior of a passenger compartment or cooling of an onboard device are included in the plurality of load devices;

when the electrical power for driving the electric machine varies, the control device regulates the electrical power supplied from the electricity storage device to the load devices other than the electric machine, so as to enhance the overall efficiency with the electrical power for the electric machine having varied; and

the control device reduces the electrical power for driving the temperature regulation device when the electrical power for driving the electric machine has been increased, so that the overall efficiency after increase of the electrical power supplied to the electric machine is enhanced, and increase of the electrical power supplied to the electric machine is enhanced, and increases the electrical power for driving the temperature regulation device when the electrical power for driving the electric machine has been decreased, so that the overall efficiency after decrease of the electrical power supplied to the electric machine is enhanced.

2. A control system for an electric vehicle according to claim 1, wherein:

an electrical power conversion device that converts the electrical power of the electricity storage device and supplies electrical power to another electricity storage device is included in the load devices other than the electric machine; and

the control device reduces the electrical power supplied to the power conversion device when the electrical power for driving the electric machine has been increased, so that the overall efficiency after increase of the electrical power supplied to the electric machine is enhanced, and increases the electrical power supplied to the power conversion device when the electrical power for driving the electric machine has been decreased, so that the overall efficiency after decrease of the electrical power supplied to the electric machine is enhanced.

3. A control system for an electric vehicle according to claim 1, wherein:

when electrical power is supplied from the electricity storage device to the plurality of load devices, the control device regulates the electrical power supplied from the electricity storage device to each of the plurality of load devices, so as to reduce fluctuations of the electrical power discharged from the electricity storage device.

4. A control system for an electric vehicle according to claim 1, wherein:

the control device calculates electrical power requested to each of the load devices based upon an amount of actuation by a driver and a running state of the electric vehicle that are detected by a plurality of detectors.

5. A control system for an electric vehicle according to claim 4, wherein:

each of the load devices measures electric power used for actually performing the operations of the electric vehicle by using a plurality of detectors, and also calculates a working efficiency based upon the measured electrical power and the electrical powers that are supplied to each of the load devices.

6. A control system for an electric vehicle according to claim 5, wherein:

the control device determines the electrical power to be supplied to each of the load devices by correcting the requested electrical power for each of the load devices by the working efficiency of each of the load devices.

7. A control system for an electric vehicle according to of claim 1, wherein:

the control device forecasts a future running state of the electric vehicle based upon a current running state of the electric vehicle detected by a plurality of detectors and based upon road map information and position measurement information, also, based upon the future running state resulting from forecasting, forecasts electric power that will be supplied from the electricity storage device to each of the load devices and the charge/discharge efficiency of the electricity storage device and the working efficiency of each of the load devices that will accompany the forecasted electrical power, and regulates the electrical power supplied from the electricity storage device to each of the load devices in advance so as to enhance the overall efficiency in that future running state.

8. A control system for an electric vehicle according to claim 7, wherein:

the control device forecasts variation of the electric power that will be supplied for driving the electric machine based upon the future running state resulting from forecasting, and, for a load device other than the electric machine for which the electrical power to be supplied is regulated along with the variation of the electrical power supplied to the electric machine, temporarily increases in advance the electrical power supplied to the load device before the electrical power supplied to the electric machine increases, and temporarily reduces in advance the electrical power supplied to the load device before the electrical power supplied to the electric machine decreases.

9. A control system for an electric vehicle according to claim 1, wherein:

the plurality of load devices includes a thermal storage device that accumulates heat or cold generated by the electricity storage device and the plurality of load devices, as well as the temperature regulation device that performs air conditioning of the interior of the passenger compartment or cooling of the onboard device; and

the temperature regulation device performs heating or air conditioning of the interior of the passenger compartment and cooling of the onboard device using the heat or cold accumulated in the thermal storage device, thus reducing the electrical power supplied from the electricity storage device to the temperature regulation device.

11. An electric vehicle, comprising:

a control system according to claim 1.

10. A control system for an electric vehicle, comprising:

an electricity storage device that performs charging and discharging of electrical power;

a plurality of load devices that receive supply of electrical power from the electricity storage device and perform various operations of the electric vehicle; and

a control device that controls the electricity storage device and the plurality of load devices, wherein;

when electrical power is supplied from the electricity storage device to the plurality of load devices, the control device regulates an amount of electrical power supplied from the electricity storage device to each of the load devices, so as to reduce fluctuations of the electrical power discharged from the electricity storage device;

an electric machine for propelling the electric vehicle is included in the plurality of load devices;

the control device regulates the electrical power supplied from the electricity storage device to a load device other than the electric machine, so as to reduce fluctuations of the electrical power discharged from the electricity storage device when the electrical power for driving the electric machine varies; and

the control device forecasts a future running state of the electric vehicle based upon a current running state of the electric vehicle detected by a plurality of detectors and based upon road map information and position measurement information, also, based upon, the future running state resulting from forecasting, forecasts variation of the electric power that will be supplied for driving the electric machine, and, for a load device other than the electric machine for which the supply of electrical power is regulated along with the variation of the electrical power supplied to the electric machine, temporarily increases in advance the electrical power supplied to the load device before the electrical power supplied to the electric machine increases, and temporarily reduces in advance the electrical power supplied to the load device before the electrical power supplied to the electric machine decreases.