| 摘要 |
PURPOSE:To make possible highly accurate differential measurement even for changing physical quantities by controlling circuit time constants by pulse train signals. CONSTITUTION:The 1st sample holding circuit 2 is controlled by the pulse trains corresponding to the revolutions of a crank shaft outputted by a crank pulse generating circuit 3, and the values of engine pressure etc. detected by a pressure detector 1 are successively sampled and held. These held values are successively held in the 2nd sample holding circuit 4 controlled by the pulse trains by way of a delay circuit 5. The differential values of the held values of the circuit 2, 4 are generated by a differential amplifier 6, and are made into differentiated outputs of the detected pressure etc. By the constitution with which these circuit time constants are controlled by the pulse trains corresponding to the number of revolutions etc., the highly accurate differential measurement is performed for changing physical quantities as well. |
