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Method for operating on-off valves

A technology of switching valves and closing control, which is applied to the direction of valves, valve devices, and functional valve types used for ventilation, and can solve the problems of introducing additional costs for current sensors

Active Publication Date: 2019-03-19
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The method described is only possible when the activated carbon filter is full,
[0008] 2. The method is only implemented during relatively long periods of stationary operation of the engine,
However, in this case additional cost is introduced for the current sensor

Method used

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  • Method for operating on-off valves
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  • Method for operating on-off valves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] figure 1 A fuel tank ventilation system of a motor vehicle is schematically shown. The motor vehicle has an engine 7 , the combustion air of which is supplied via an intake duct 6 . Other components of the engine (injection system, etc.) are not illustrated here. The vehicle further has a fuel tank 1 from which fuel vapors are supplied via a line 2 to an activated carbon filter 3 and are adsorbed by said activated carbon filter 3 . These hydrocarbons adsorbed in the filter are introduced via line 5 into the intake duct 6 of the engine 7 by opening the tank vent valve 4 to be flushed at certain intervals, to be supplied with the combustion air to the combustion process of the engine. A pressure sensor 8 is arranged in the region of the intake manifold 6 , wherein the pressure prevailing in the intake manifold can be measured by means of the pressure sensor 8 .

[0034] The system further has a control device 9 which can be part of the engine controller. The control d...

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PUM

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Abstract

The invention relates to a method for operating a switching valve (4) which opens and closes a fluid line (5). The switching valve (4) is actuated by means of a pulse width modulated (PWM) signal. The switching valve (4) is actuated outside the effective operating time of the switching valve by using a PWM signal with an increasing or decreasing duty cycle. The duty cycle at which the on-off valve (4) is open is determined, and the on-off valve (4) is then actuated using the duty cycle corresponding to the opening time to open and close the on-off valve during the effective operating time of the on-off valve. In this way, the switching valve ( 4 ) can be actuated in a particularly precise manner.

Description

technical field [0001] The invention relates to a method for operating a switching valve that opens and closes a fluid line and is actuated by means of a pulse width modulated (PWM) signal to open and close a control device. [0002] Switching valves of this type are distinguished by a particularly simple design, since they are only moved by controlling between two switching states, in particular fully open or fully closed. Therefore, the switching valve does not assume any intermediate positions. Background technique [0003] The switching valve is actuated by means of a pulse width modulated (PWM) signal. This signal is defined by the control device based on various set point values ​​for the corresponding operating parameters. However, there is a risk in the event that the corresponding actual value deviates from the setpoint value, for example due to component tolerances, operating tolerances, etc., leading to an incorrect determination of the switching valve Open tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02D41/24
CPCF02M25/0836F02M25/089F02D41/004F02D2041/2017F02D2041/2055F02D41/2464F02D2200/0406B60K15/03519B60K2015/0321B60K2015/03236B60K2015/03256B60K2015/03542B60K2015/03585F16K24/04G05B15/02G05D7/0635
Inventor R.豪弗勒
Owner VTESCO TECH GMBH
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