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Stuck-open fault detection method and device for hydraulic torque converter

A hydraulic torque converter and fault detection technology, which is applied in the direction of measuring devices, machine/structural component testing, instruments, etc., can solve the problem of hydraulic torque converter normally open fault, hydraulic torque converter damage, and vehicle abnormality Operation and other problems, to achieve the effect of simple detection process, saving detection time and accurate detection results

Inactive Publication Date: 2015-03-25
SHENGRUI TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the actual operation process, the torque converter may have a normally open fault. If the torque converter is in the normally open fault for a long time, it will cause damage to the torque converter and even cause the vehicle to fail to operate normally.

Method used

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  • Stuck-open fault detection method and device for hydraulic torque converter
  • Stuck-open fault detection method and device for hydraulic torque converter
  • Stuck-open fault detection method and device for hydraulic torque converter

Examples

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Embodiment 1

[0051] figure 1 It is a flow chart of a normally open fault detection method for a hydraulic torque converter provided by the present invention. The method includes the following steps:

[0052] S10: judging whether the gearbox enters a limp home mode;

[0053] The limp home mode means that when a serious fault occurs in the gearbox, the electronic control unit in the control unit will immediately cut off the power supply of the solenoid valve, so that the gearbox enters the hydraulically controlled limp home mode, and the car will turn to the car in the limp home gear. Drive the car home or go to a nearby garage for repairs. If the car enters the limp home mode, the power supply of the solenoid valve is cut off, and the collected current value of the solenoid valve of the torque converter is inaccurate, and it is impossible to judge the normally open fault of the torque converter. , when judging whether there is a normally open fault, first judge whether the current gearbo...

Embodiment 2

[0087] Figure 5 A structural diagram of a normally open fault detection device for a hydraulic torque converter provided by the present invention. The normally open fault detection device of the hydraulic torque converter includes: a limp home mode judging unit 50 , a normally open fault judging unit 51 and a control unit 52 .

[0088] The limp home mode judging unit 50 is configured to judge whether the gearbox enters the limp home mode.

[0089] The limp home mode judging unit 50 is connected to the gearbox for judging whether the gearbox enters the limp home mode.

[0090] The normally open fault judging unit 51 is used for judging whether the torque converter is in a locked state and whether the slip value of the torque converter is greater than a slip threshold when the gearbox does not enter the limp home mode.

[0091] The normally open fault judging unit 51 is connected with the limp home mode judging unit 50, and when the limp home mode judging unit 50 judges that ...

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PUM

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Abstract

The invention discloses a stuck-open fault detection method for a hydraulic torque converter. The method includes the steps of judging whether a gearbox enters a limp home mode or not, judging whether the hydraulic torque converter is in the locked state or not and whether the slip value of the hydraulic torque converter is larger than the slip threshold value or not when the gearbox does not enter the limp home mode, and determining that the stuck-open fault exists in the hydraulic torque converter and sending a hydraulic torque converter starting command to the hydraulic torque converter when the judgment result shows that the hydraulic torque converter is in the locked state and the slip value of the hydraulic torque converter is larger than the slip threshold value. According to the method, whether the gearbox enters the limp home mode or not is judged first, whether the stuck-open fault exists in the hydraulic torque converter or not is determined through the locking state of the hydraulic torque converter and the slip value of the hydraulic torque converter under the condition that the hydraulic torque converter does not enter the limp home state, the detection process is simple, and the detection result is accurate. In addition, the invention further discloses a corresponding stuck-open fault detection device for the hydraulic torque converter.

Description

technical field [0001] The invention relates to the field of fault diagnosis, in particular to a method for detecting a normally open fault of a hydraulic torque converter and a device for detecting a normally open fault of a hydraulic torque converter. Background technique [0002] The hydraulic torque converter is the connecting part between the engine and the gearbox of an automatic transmission car. It uses hydraulic oil as the working medium to make the connection between the engine and the gearbox non-rigid, so as to facilitate the gearbox to shift gears. The function of the torque converter is to transmit torque, change torque, change speed and clutch. Therefore, the torque converter plays a vital role in the entire transmission shifting process. [0003] A torque converter usually includes a casing, a guide wheel, a turbine and a pump wheel, etc. The hydraulic torque converter has two states in the actual working process, one is the locked state and the other is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
Inventor 辛彩云鲁曦李强秦春磊
Owner SHENGRUI TRANSMISSION