| 摘要 |
<p>The operating system uses a pulse generator (16) providing a pulse signal synchronous with the rotation of the engine, with the pulse width being dependent on the fuel/air ratio to be supplied. The magnet coil (10) for the valve is connected to a DC source (+V) via a switch (20) controlled by the pulses from the pulse generator (16). A current control device (22) allows the current supplied to the magnet coil (10) to be increased at the beginning of the coil energisation. Pref. the switch (20) comprises an NPN transistor with its base coupled to the output of the pulse generator (16), while the current control device (22) comprises a capacitor coupled to the opposite side of the magnet coil (10) to the transistor. The pulse generator (16) has two inputs respectively coupled to an engine rev counter (14) and to a detector (12) for the fuel/air ratio.</p> |
