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Limiting engine on condition while coasting

a technology of condition and engine, applied in the direction of external condition input parameters, transportation and packaging, tractors, etc., can solve the problems of recouping regenerative energy and negatively affecting fuel economy, and achieve the effect of increasing charge power and recouping the energy generated by the initial amoun

Active Publication Date: 2020-10-29
TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]In some embodiments, the ECU increases a charge power limit of a battery powering the at least one electric motor as long as the HEV can continue being operated without the internal combustion engine generating drive power, the increased charge power allowing the battery to recoup energy generated by the initial amount of the regenerative torque.
[0019]In some embodiments, the ECU increases an SOC of the battery as long as the HEV can continue being operated without the internal combustion engine generating drive power, the increased SOC allowing the battery to recoup the energy generated by the initial amount of the regenerative torque.

Problems solved by technology

This can negatively impact fuel economy as well as recouping regenerative energy.

Method used

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  • Limiting engine on condition while coasting
  • Limiting engine on condition while coasting
  • Limiting engine on condition while coasting

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Embodiment Construction

[0035]Various embodiments of the present disclosure are directed to counteracting the engine-on condition in an HEV when the HEV is coasting (e.g., while traveling along a downhill slope). A pinion gear, also referred to as a sun gear, is one component of a planetary gear set. A pinion gear overspeed condition may harm the motor or motor-related hardware. Control systems for HEVs may calculate a pinion gear speed limit in the transaxle above which those failures may occur. Accordingly, such control systems implement a mechanism whereby when the pinion gear speed surpasses a threshold reflecting the pinion gear speed limit, the engine of the HEV is automatically turned on. Use of the engine will cause a reduction in pinion gear speed and / or the relative speed between the pinion gear and other associated components, e.g., the planet gears, the ring gear, the carrier, etc., avoiding hardware failure.

[0036]As alluded to above, control systems for HEVs do not prevent an HEV that is coast...

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Abstract

Systems and methods are provided that prevent or override a hybrid electric vehicle (HEV) from operating in an engine-on mode or condition when the HEV is coasting, such as when the HEV is traveling on a downhill grade. Regenerative torque is generated by one or more electric motors of the HEV so that the pinion gear of a planetary gear set of a power distribution mechanism operates below an overspeed limit at which hardware failure may occur.

Description

TECHNICAL FIELD[0001]The present disclosure relates generally to controlling drive power in a hybrid electric vehicle (HEV). In some embodiments, actions can be performed in order to counteract excessive pinion gear speed (or pinion overspeed) in the planetary gear set of the HEV, which can be reflected by way of or indicated as a maximum engine-on vehicle (EOV) speed.DESCRIPTION OF RELATED ART[0002]HEVs have become increasingly popular among consumers concerned with their environmental impact and with increasing fuel economy. HEVs generally utilize an engine, e.g., an internal combustion engine (ICE), along with one or more electric motors, which can also operate as a generator(s) to provide energy to a battery that powers the electric motor(s). The drivetrain of an HEV can include the engine, the one or more electric motors, and an automatic transmission coupled to the engine and the one or more electric motors for transmitting power from the engine, electric motor(s), or a combin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60W20/11B60K28/10B60W20/40
CPCB60W20/40B60K2028/006B60W20/11B60K28/10B60K6/445B60W10/08B60W10/184B60W20/00B60W30/1846B60W50/0097B60W2510/244B60W2710/083Y02T10/62B60K2023/0858B60W30/18072B60W2552/15
Inventor GAITHER, GEOFFREY D.
Owner TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA
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