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Method for diagnosing a hydraulic system of a motor vehicle

A technology for hydraulic systems and motor vehicles, which is applied in the field of hydraulic systems and can solve problems such as difficult diagnosis of hydraulic systems

Active Publication Date: 2019-09-03
MAGNA PT B V & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage in this case is that components of the hydraulic system, e.g. passively actuated components such as the valve of the flow restrictor, have no direct influence on the actuator, so that the diagnostic variables of the hydraulic system can only be determined with the aid of the signal from the actuator. extremely difficult

Method used

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Examples

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Embodiment Construction

[0011] Cooling flow is provided by a fluid, preferably oil.

[0012] Oil offers the advantage that it can also be used to lubricate the components to be cooled.

[0013] For example, this can be a bearing or a journal in the case of a double clutch or an electric motor.

[0014] In order to perform the diagnosis, the method is carried out by providing a cooling flow with a first cooling flow and a second cooling flow, wherein the first cooling flow is in the range of 5% to 30% of the total cooling flow in the hydraulic system, preferably 10% to 20% range.

[0015] The first cooling flow should preferably be in a range which is still just sufficient to ensure functionality. However, this quantity should be so low that faults can be detected by means of corresponding measuring methods.

[0016] In the hydraulic system the second cooling flow is in the range of 70% to 100% of the total cooling flow, preferably in the range of 80% to 95%.

[0017] The second cooling flow is th...

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PUM

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Abstract

The invention relates to a method for diagnosing a hydraulic system of a motor vehicle, wherein the hydraulic system forms a cooling loop. The cooling loop is provided with at least one to-be-cooled component, particularly a clutch, double clutches, a transmission or a motor. In a first step, the cooling loop is configured for injecting a first cooling flow to the to-be-cooled component and afterwards determining reaction of the to-be-cooled component. In the second step, the cooling loop is configured to injecting a second cooling flow to the to-be-cooled component, wherein the second coolingflow is higher than the first cooling flow; and afterwards determining the reaction of the to-be-cooled component, wherein the relation between the two reactions is determined for confirming the state of the cooling loop and furthermore confirming the state of the hydraulic system.

Description

technical field [0001] The invention relates to a method for diagnosing a hydraulic system of a motor vehicle, wherein the hydraulic system forms a cooling circuit, wherein at least one of the cooling circuits is provided with at least one component to be cooled, in particular a clutch, a transmission or an electric motor (motor ,electric motor). Background technique [0002] It is known in the prior art to monitor the state of a hydraulic system in a motor vehicle, for example by means of electrical signals from actuators which are designed to actuate the components to be cooled and which, when measured values ​​differ Sends status information about the hydraulic system when expected to change. [0003] The disadvantage in this case is that components of the hydraulic system, e.g. passively actuated components such as the valve of the flow restrictor, have no direct influence on the actuator, so that the diagnostic variables of the hydraulic system can only be determined w...

Claims

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Application Information

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IPC IPC(8): F16H61/12
CPCF16H61/12F16D48/062F16D2500/1066F16D2500/30404F16D2500/30405F16D2500/3051F16D2500/3064F16D2500/30803F16D2500/5108F16D2500/511F16D2500/70448
Inventor 雅克·普罗斯特莫里茨·文特因戈·凯克托尔斯滕·斯特帕尔马蒂亚斯·菲尔普马丁·沙勒
Owner MAGNA PT B V & CO KG
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