Oil circulation system for electric motor in a hybrid electric vehicle

A hybrid electric and circulation system technology, applied in the field of oil circulation system, can solve problems such as insufficient lubricity, inability to cool oil circulation, etc., and achieve the effect of high-efficiency rotation

Active Publication Date: 2013-12-18
SUZUKI MOTOR CORP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] However, the motor oil circulation system disclosed in JP-A2006-254616 has the following problems: its cooling function will only work if the electric oil pump is successfully started, because the cooling oil cannot be circulated until the electric oil pump is successfully started.
If the oil circulation system for motors disclosed in JP-A2006-254616 is applied to the circulation of lubricating oil for motors, lubricity may become insufficient due to insufficient supply of lubricating oil to sliding parts of the motor

Method used

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  • Oil circulation system for electric motor in a hybrid electric vehicle
  • Oil circulation system for electric motor in a hybrid electric vehicle
  • Oil circulation system for electric motor in a hybrid electric vehicle

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Embodiment Construction

[0023] One embodiment of the present invention will be described with reference to the drawings. Figures 1 to 4 An exemplary hybrid electric vehicle having an embodiment of an oil circulation system for an electric motor according to the present invention will be described.

[0024] refer to figure 1 , the hybrid electric vehicle, now designated by reference numeral 100 , includes an internal combustion engine 111 , a first electric motor or first motor-generator (first MG) 121 , and a second electric motor or second motor-generator (second MG) 131 as a power source. Hybrid electric vehicle 100 is driven by activating engine 111 , first MG 121 and second MG 131 to appropriately transmit power to drive shafts 101 each coupled to one of the sets of drive wheels 102 via transmission 103 . The engine 111 is configured to generate driving force due to combustion of gasoline for the purpose of transmitting driving torque to rotate a drive shaft, and can generate any desired level...

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Abstract

An oil circulation system for electric motors in a hybrid electric vehicle having, as a power source, an internal combustion engine is disclosed. Provision is made to start oil circulation under high reliability even though an electric pump cannot circulate lubricant oil through the electric motors due to increased viscosity at low temperatures. The oil circulation system includes the electric pump in fluid communication with an oil flow path for the electric motors;a mechanical pump, in fluid communication with the oil flow path, operable on driving power of the engine;and a controller for control of operation of the electric pump and that of the mechanical pump. The controller utilizes operation of the mechanical pump upon detection of abnormality in operation of the electric pump derived from viscosity of the lubricant oil in order to recover the electric pump.

Description

technical field [0001] The present invention relates to an oil circulation system for an electric motor in a hybrid electric vehicle, and more particularly, to an oil circulation system for ensuring a sufficient supply of oil required for the operation of the electric motor. Background technique [0002] It is common practice for electric motors to use lubricating oil to provide a smooth rotational drive. By circulating lubricating oil through a lubricating oil pipe extending around the motor to use the lubricating oil as cooling oil, the motor can efficiently operate using heat generated during cooling of rotational driving. A heat exchanger can be placed midway in the lube oil line, or a different cooling oil can be circulated. For example, JP-A 2006-254616 discloses a cooling system that circulates cooling oil. The following pump start-up procedure is realized in this electric motor oil circulation system: in the case that the electric oil pump cannot start the cooling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R17/02B60K11/02
CPCF04B17/03F04B17/05F04B23/04F04B49/065
Inventor 田爪国利
Owner SUZUKI MOTOR CORP
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