System and method for pre-charging a hybrid vehicle for improving reverse driving performance

a hybrid vehicle and reverse driving technology, applied in the direction of battery/fuel cell control arrangement, navigation instruments, instruments, etc., can solve the problems of insufficient power and insufficient stored electrical energy for propelling the movement of the hybrid vehicl

Active Publication Date: 2016-06-02
TOYOTA JIDOSHA KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In certain conditions, however, the stored electrical energy may not be sufficient for propelling movement of the hybrid ve...

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  • System and method for pre-charging a hybrid vehicle for improving reverse driving performance
  • System and method for pre-charging a hybrid vehicle for improving reverse driving performance
  • System and method for pre-charging a hybrid vehicle for improving reverse driving performance

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Embodiment Construction

[0016]The invention relates to a method and a system of managing pre-charging of a battery of a hybrid vehicle to improve reverse direction hill climb performance. The system / method determines whether pre-charging is needed based on the vehicle state and environmental conditions. This determination can be based on a grade value (or an angle) of a surface or hill upon which the vehicle is positioned, as detected by a grade sensor. The determination can also be based on a state of charge (SOC) value of the battery. The higher the grade value of the hill, and the lower the SOC value, the more likely that pre-charging would be required. The system and method may also base this decision on the expected distance that the vehicle will travel in reverse uphill. The system sets a charging rate and a target charge value based on the detected grade value, SOC data, and / or other sensed data. The engine produces the required charging energy to be stored in the battery. A message may be displ...

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Abstract

A method/system is provided for improving reverse hill climb performance of a hybrid vehicle. An electronic control unit (ECU) determines whether pre-charging is needed based on vehicle state and environmental conditions. This determination can be based on a grade value of a hill upon which the vehicle is positioned, a state of charge (SOC) of the battery, and/or the expected distance that the vehicle will travel uphill. The ECU sets a charging rate and a target charge value based on the foregoing data. The battery may be charged to have an SOC that exceeds an actual needed target charge value by a hysteresis margin. A message may be displayed requesting the driver to wait until pre-charging is complete. The engine charges the battery at the charging rate until the SOC reaches the target charge value. The driver is prompted that he or she can start reverse driving.

Description

BACKGROUND[0001]1. Field[0002]The present invention relates to methods and systems for managing a charging operation of a hybrid vehicle.[0003]2. Description of the Related Art[0004]With, growing environmental awareness and concerns for energy efficiency, demand for various forms of hybrid vehicles that utilize non-fuel energy has significantly increased. Movement of a hybrid vehicle and / or operation of its units may be powered, wholly or in part, by electrical power stored in one or more batteries. The batteries are used to power the hybrid vehicle when the engine is turned off. As one might expect, a hybrid vehicle travelling up a steep hill will generally require more electrical power from the batteries than when travelling on a flat smooth road. In certain conditions, however, the stored electrical energy may not be sufficient for propelling movement of the hybrid vehicle. This insufficient power may occur when the hybrid vehicle is operated in a reverse gear and needs to travel...

Claims

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Application Information

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IPC IPC(8): B60L11/18B60K35/00G01C21/26
CPCB60L11/1809B60L11/1861B60W20/00B60K35/00B60K2350/1076G01C21/26B60K6/365B60K6/48B60K2006/541B60W30/18036B60W50/14B60W2510/244B60W2540/16B60W2710/244B60W2710/248B60W20/13B60L50/15B60L58/12B60K2370/16B60K2370/169B60W2552/15G01C21/3697Y02T10/62Y02T10/70Y02T10/7072Y02T90/16
Inventor GAITHER, GEOFFREY D.
Owner TOYOTA JIDOSHA KK
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