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Method and device for determining the clutch engagement point in a motor vehicle

A technology for motor vehicles and clutches, applied in the direction of braking action starting devices, clutches, automatic starting devices, etc., can solve the problems of increasing structural complexity, delayed release, and increasing the cost of HLA systems, so as to increase structural complexity and increase Effect of hardware cost

Inactive Publication Date: 2010-08-04
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such an analog sensor for determining the clutch engagement position increases the structural complexity and thus the cost of the HLA system
[0005] Furthermore, methods of solving the above problems using software sensing of the clutch engagement point have also proven inadequate because of late or undesired releases using these methods, where the sensing of the clutch engagement point are based on the determination of engine speed drops, or inertial effects are exploited in these methods

Method used

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  • Method and device for determining the clutch engagement point in a motor vehicle
  • Method and device for determining the clutch engagement point in a motor vehicle
  • Method and device for determining the clutch engagement point in a motor vehicle

Examples

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Embodiment Construction

[0029] figure 1 Shown is a flow chart illustrating a typical timeline in the process of determining the clutch engagement point of the invention. Clutch engagement state is sensed by sensors based on engine speed, engine torque, accelerator pedal position and based on changes in these signals over time. The release reference uses these input signals in various ways during different phases of clutch engagement. figure 1 Exemplary timelines are shown, along with which reference is valid to initiate brake release.

[0030] Here, the clutch engaged position itself is unknown since no continuous clutch engaged position signal is available. Clutch engagement may occur at a specific period (hatched area) after the clutch pedal is released. During this period, due to the activation of the accelerator pedal, the engine torque has reached a certain torque level, and the torque level must be large enough to allow the vehicle to start without stalling the engine. Hill start assist sho...

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Abstract

The present disclosure relates to methods and devices for determining a clutch engagement point in a motor vehicle. The inventive method includes the following steps: determining a plurality of input signals characteristic of an operating state of the engine; and evaluating the plurality of input signals in a plurality of criteria which are independent of one another in order to determine the clutch engagement point. At least one of the plurality of criteria is deactivated at least temporarily as a function of the state of the engine.

Description

technical field [0001] The invention relates to a method and a device for determining a clutch engagement point in a motor vehicle. Background technique [0002] In vehicles equipped with Hill-Launch Assist (also called HLA (Hill-Launch-Assist) system for short), the driver can take his foot off the brake pedal and then step on the accelerator pedal without the vehicle Fall backwards. The HLA system maintains hydraulic brake pressure and thus holds the motor vehicle at a standstill until the clutch engagement point is established before releasing the brake pressure. [0003] Determining the clutch engagement point by using the control software is of particular importance for the proper operation of the HLA system since the engine torque is sent to the wheels and the vehicle can only be launched when the clutch is engaged. If the clutch engagement point is not carefully and precisely determined, the vehicle could roll backwards due to engine torque not being delivered to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D48/06F16D48/08B60T7/12
CPCF16D2500/3068F16D2500/50269F16D2500/50251F16D2500/50825F16D2500/3067F16D2500/3061B60T7/122F16D48/06F16D2500/31446B60T2201/06F16D2500/3065
Inventor 托马斯·莱因霍尔德·维克卢西恩·利波克
Owner FORD GLOBAL TECH LLC
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