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Oil pump diagnosis method in gearbox and hybrid electric vehicle using the method

A diagnostic method and gearbox technology, which is applied to hybrid vehicles, motor vehicles, transmission control, etc., and can solve problems such as inability to protect the hardware in the gearbox

Active Publication Date: 2017-09-15
SAIC MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has obvious flaws, because the oil pump diagnosis is performed after the abnormal operation of the transmission, and it is impossible to substantially protect the hardware in the transmission

Method used

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  • Oil pump diagnosis method in gearbox and hybrid electric vehicle using the method
  • Oil pump diagnosis method in gearbox and hybrid electric vehicle using the method
  • Oil pump diagnosis method in gearbox and hybrid electric vehicle using the method

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Embodiment Construction

[0020] The following introduces some of the possible embodiments of the present invention, which are intended to provide a basic understanding of the present invention, but are not intended to identify key or decisive elements of the present invention or limit the scope of protection. It is easy to understand that, according to the technical solution of the present invention, those skilled in the art may propose other alternative implementation manners without changing the essence and spirit of the present invention. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0021] According to one aspect of the present invention, a method for diagnosing an oil pump in a gearbox is provided, including: monitoring the oil temperature and oil p...

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Abstract

The invention discloses a transmission oil pump diagnostic method. The method includes: monitoring oil temperature and oil pressure for an oil pump in real time; according to curves of the oil temperature, the oil pressure and nominal pumping features of the oil pump, acquiring an upper limit and a lower limit of the oil pressure; if the oil pressure falls in a range of the upper limit and the lower limit, determining that the oil pump is normal; if not, determining that the oil pump is abnormal. The invention further discloses a hybrid electric vehicle employing the transmission oil pump diagnostic method.

Description

technical field [0001] The invention relates to the field of hybrid vehicles, in particular to the field of electric drive transmission system control of hybrid vehicles. Background technique [0002] The oil pump is an important part of the electric drive gearbox and the heart of the entire hydraulic control system. Once the oil pump fails, it will have a great impact on the work of the entire electric drive transmission hydraulic system, and even cause the car to fail to start. The existing techniques for fault diagnosis of oil pumps are generally as follows: when there are abnormal phenomena such as automatic transmission slipping, shift shock, and weak start of forward gears, the specific faults of the oil pump are judged by doing the main oil pressure test. This technology has obvious defects, because the oil pump diagnosis is done after the abnormal operation of the transmission, and the hardware in the transmission cannot be substantially protected. Therefore, a met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W10/30B60W10/103B60W20/00B60W20/50
CPCB60W10/103B60W20/00F16H61/4192
Inventor 马成杰姜丰伟郜可峰张吉军
Owner SAIC MOTOR