Switchover method for a solenoid valve operated in analogized form, electrohydraulic brake system, and use of the electrohydraulic brake system

A technology of brake system, conversion method, applied in the direction of brake, valve operation/release device, valve detail, etc., which can solve the problem of inaccuracy, etc.

Inactive Publication Date: 2015-04-29
CONTINENTAL TEVES AG & CO OHG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the methods known from the prior art for sensorless pressure regulation in vehicle brake systems have the disadvantage that these methods have inherent limitations due to the hysteresis effect of the ferromagnetic valve yoke of conventional analog solenoid valves. imprecision
However, if according to the prior art this detrimental effect of the hysteresis effect is avoided by means of anti-hysteresis pulses, the sudden current changes brought about by the anti-hysteresis pulses usually result in unwanted noise or braking forces which are perceived by the driver. Varying forms of vehicle braking system response

Method used

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  • Switchover method for a solenoid valve operated in analogized form, electrohydraulic brake system, and use of the electrohydraulic brake system
  • Switchover method for a solenoid valve operated in analogized form, electrohydraulic brake system, and use of the electrohydraulic brake system
  • Switchover method for a solenoid valve operated in analogized form, electrohydraulic brake system, and use of the electrohydraulic brake system

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Embodiment Construction

[0027] figure 1The current- and pressure-dependent hysteresis characteristic curve 11 of a solenoid valve is shown by way of example in . The x-axis represents the current applied to the solenoid valve, and the y-axis represents the pressure acting on the solenoid valve at which the solenoid valve is opened by applying a correspondingly set current. As the current loading increases from point 12 , the magnetic force on the solenoid valve, which according to the example keeps the solenoid valve closed, even if the valve stem remains in the closed position, changes to a higher pressure along line 13 . At point 14 the maximum magnetic force is reached. This corresponds to the maximum pressure the solenoid valve can withstand without opening. Now, starting from point 14 , if the current application is reduced again, the magnetic force, and thus the pressure, changes along line 15 with the solenoid valve open. As can be seen, hysteresis effects produce the phenomenon that two di...

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Abstract

The invention relates to a switchover method for a solenoid valve (52, 42), operated in analogized form, in an electrohydraulic brake system (30), in which method the solenoid valve (52, 42) can assume a closed position, an open position and a multiplicity of intermediate positions in accordance with electrical actuation or regulation, and wherein the actuation or regulation is performed as a function of a known current-pressure characteristic curve of the solenoid valve (52, 42). The switchover method according to the invention is characterized in that, upon a switchover of the solenoid valve (52, 42), a pressure-dependent and / or current-dependent magnetic hysteresis characteristic of the solenoid valve (52, 42) is compensated directly without prior modification of the present hysteresis characteristic. The invention also relates to an electrohydraulic brake system (30) and the use of the brake system (30).

Description

technical field [0001] The invention relates to a switching method of a solenoid valve for analog operation according to the preamble of claim 1 , an electrohydraulic brake system according to the preamble of claim 10 and their use. Background technique [0002] In modern vehicle brake systems with electro-hydraulic pressure regulation, the most precise control of analogue digital valves is the function of various comfort functions such as distance and speed, which are becoming more and more popular. Conditions of increasing importance for regulating systems. Although the use of pressure sensors in each brake wheel cylinder in the known manner enables precise pressure measurement and consequently precise regulation of the required brake pressure at any time, this leads to additional pressure sensors The excessively high cost input of the brake system and the associated higher overall cost of the brake system, which in turn negatively affects the commercial competitiveness o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/36F16K31/06
CPCB60T8/36B60T8/3655B60T8/4872F16K31/0675F16K31/061B60T13/686B60T13/142
Inventor A·纽R·格罗诺H·科尔曼J·博恩泽瑟尔T·弗兰克
Owner CONTINENTAL TEVES AG & CO OHG
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