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Method for detecting loss of fluid or blockage in a hydraulic circuit using exponentially weighted moving average (EWMA) filter

A hydraulic circuit, hydraulic fluid technology, applied in the direction of components with teeth, gear lubrication/cooling, transmission control, etc., can solve problems such as increasing costs

Active Publication Date: 2013-12-04
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such sensors and measurement devices can add cost and limit packaging constraints within hydraulic control systems

Method used

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  • Method for detecting loss of fluid or blockage in a hydraulic circuit using exponentially weighted moving average (EWMA) filter
  • Method for detecting loss of fluid or blockage in a hydraulic circuit using exponentially weighted moving average (EWMA) filter
  • Method for detecting loss of fluid or blockage in a hydraulic circuit using exponentially weighted moving average (EWMA) filter

Examples

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Embodiment Construction

[0068] Referring now to the drawings, in which are shown for the purpose of illustrating certain exemplary embodiments only and not for the purpose of limiting these embodiments, figure 1 An exemplary hydraulic control system 10 for a transmission is schematically shown. In one exemplary embodiment, the transmission is a direct range transmission for a battery electric vehicle. Accordingly, direct gear transmissions do not include a gear selection system that utilizes hydraulically activated and deactivated torque-transmitting devices. The hydraulic control system 10 is used to lubricate the transmission and provide temperature management of the transmission by communicating hydraulic fluid 12 from a sump 14 to at least one of a plurality of subsystems of the hydraulic circuit 11 . The various subsystems of the hydraulic circuit 11 may include a cooler subsystem 42 and a lubrication and temperature management subsystem 48 . However, in some embodiments, hydraulic circuit 11 ...

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PUM

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Abstract

The invention relates to a method for detecting loss of fluid or blockage in a hydraulic circuit using an exponentially weighted moving average (EWMA) filter. The invention relates to a method for detecting a fault condition in a vehicular hydraulic circuit during a drive cycle using an electric pump includes monitoring an actual pump torque and monitoring a desired pump torque. A current confidence factor is determined based on the actual pump torque and the desired pump torque. An average confidence factor is iteratively calculated based on the current confidence factor and previously determined confidence factors. The average confidence factor is compared with a fault condition threshold. An absence of the fault condition in the hydraulic circuit is detected when the average confidence factor is at least the fault condition threshold, and a presence of the fault condition in the hydraulic circuit is detected when the average confidence factor is less than the fault condition threshold.

Description

technical field [0001] The present disclosure relates to hydraulic control systems for direct range transmissions. Background technique [0002] The statements in this section merely provide background information related to the present disclosure. Accordingly, such statements are not intended to constitute an admission of prior art. [0003] A hydraulic system for a transmission in a vehicle may lubricate and cool the transmission by communicating hydraulic fluid from a sump to at least one of a number of subsystems of the hydraulic circuit. In battery electric vehicles, the transmission may include a direct range transmission. Direct drive transmissions do not include a gear selection system utilizing hydraulically activated and deactivated torque transmitting devices. Thus, fault conditions including fluid leakage leading to low fluid levels within the hydraulic circuit and blockage of hydraulic fluid will not have any impact on the transmission's ability to provide ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/4192
CPCF16H57/0442F16H61/12F16H57/04F16H2061/1208F16H61/0031F16H61/4192F16H57/01
Inventor A.K.纳维A.M.策特尔V.劳尔斯N.科科托维奇
Owner GM GLOBAL TECH OPERATIONS LLC
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