| 摘要 |
PURPOSE:To keep a constant speed for a car when it runs on an ascending or descending road by using a speed correcting circuit which delivers a signal that is superposed on the output signal of a D/A converting circuit for signals. CONSTITUTION:A speed sensor 3 is revolved with traveling of a car, and the output of the sensor 3 is led to a speed integration circuit 7 to actuate a differentiating circuit 7a, a monostable-multivibrator 7b and an integration circuit 7c respectively. Then the output corresponding to the speed of a car is delivered to an output point (a). When the car running on an ascending road, the output signal of a transistor TR9 is integrated by a speed compensating circuit 10c. Then a signal of a high level is applied to an input terminal of positive pole of a comparator 10a. While the car speed voltage is applied to an input terminal of negative pole of a comparator 10a from the point (a). The voltage of the positive pole side input terminal of the comparator 10a is larger than that of the negative pole side input terminal. As a result, the comparator 10a is actuated to deliver a signal of a high level. This signal is added to the output voltage of a D/A converting circuit 6 to reduce the speed of the car. |
