| 摘要 |
A method and apparatus for determining the spring force of a closing spring upon the opening of a valve, the valve is connected by means of a connection to a pressurized-gas line in which a pressure measuring device and, upstream of the latter, a variable pressure-regulating valve, a shut-off valve and a pressurized gas source are arranged. The end of the valve opposite from the pressure line connection is connected to a flow meter. After the shut-off valve has been actuated into its open position, the control pressure regulated at its outlet by the pressure-regulating valve is changed in such a way that it rises. Once the control pressure has risen to a value at which the valve closing element rises from the valve seat, i.e., the valve opens, the flow meter transmits a measurement signal which characterizes the flow of pressurized gas and which is input into a control and evaluation unit in addition to the value for the control pressure determined by the pressure measuring device. From the control pressure determined, the control and evaluation unit calculates the spring force of the closing spring upon the opening of the valve. The method is suitable, for measuring the spring force of a closing spring of a fuel injection valve for internal combustion engines without having to remove any part of the fuel injection valve.
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