| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate necessity of an independent reaction agent level sensor. <P>SOLUTION: A fluid delivery system for delivering a metered dose of fluid from a supply tank 28 to a downstream chamber or vessel 10, comprises a pump apparatus 20 comprising a pump plunger 32 which is operable to perform a pumping stroke under control of an electromagnetic actuator 36, including a solenoid 36a, to effect delivery of the fluid and a control unit 24 for supplying an input signal 58 to the solenoid to initiate a current flow to the solenoid and thereby initiate movement of the pump plunger. An electronic device 54 provides an output signal to indicate that movement of the pump plunger has stopped at an end of the pumping stroke of a pump plunger, and a timer determines a time difference between the input signal 58 being supplied to the solenoid and the output signal being output by the electronic device 54. A processor 26 compares the time difference with a predetermined time difference and determines, as a result of the comparison, whether or not the pump plunger has performed a valid pumping stroke in which an intended volume of fluid is displaced, whether or not the stroke can be used for total flow quantity calculation. <P>COPYRIGHT: (C)2009,JPO&INPIT |
