| 摘要 |
PURPOSE:To promote the accuracy of ignition timing in an ignition device using Hall elements by setting to equalize polarities of advance position signals with each other between the first and the second crank angle. CONSTITUTION:Angle sensors 3 and 20 are constructed respectively of Hall elements 1 and 4 to be given changes of fluxes according to the revolution of an engine and transistors 2 and 5 to be given outputs thereof and changed in their states of interruption. Output terminals of angle sensors 3 and 20 are connected respectively to S and R terminals of the first FF21, while the output terminal of the sensor 30 is connected to an S terminal of the second FF23. Besides, the output terminal of the angle sensor 20 is connected to an AND gate 22. When both of outputs from the FF21 and the sensor 23 are H, an H-output is issued from the AND gate 22, and impressed on an R terminals of the FF23. Q-output signals of both FF's 21 and 23 are selected by the on-off operation of a switch 8 in a selection circuit 24, and inputted into a switching element 10 of an ignition coil 11. |
