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(1) Field of the Invention The present invention relates to a solenoid control apparatus in which in order to stably control a desired solenoid to be operated, the timings of rise and fall of an input signal and the timings of a digital signal to be processed in a control section are set to the same time. (2) Description of the Related Art A solenoid valve is used for a cylinder head stopper apparatus, an exhaust pipe clamp apparatus or the like. In a conventional solenoid valve control apparatus, since an analog signal is input to a control section for a solenoid, a signal line is used to input an analog signal from a sensor to the control section and to carry out signal conversion. Since a control circuit in the control section is an analog circuit, problems arise in that signal delay occurs at the time of signal transmission. In particular, in a signal line which is required to have high precision, the resistance of the signal line is high, the control circuit is large-scaled, and the cost of the control circuit is high. In order to solve the above-mentioned problems, an attempt has been made to provide an apparatus in which a digital signal is input to the control section and converted into an analog signal in the control section and then the analog signal is converted into a digital signal to be output to a solenoid. FIG. 12 is a block diagram showing a conventional solenoid valve control apparatus in which a digital signal is input to the control section and a digital signal is converted into an analog signal. As shown in the figure, a sensor (not shown) detects the state of the intake air, the exhaust gas or the like, and an analog signal is input to a control section 1. The control section 1 converts the analog signal input from the sensor into a digital signal and then outputs the digital signal to a solenoid 2 through a digital-to-analog converter (D/A) 3. The solenoid 2 is controlled by the digital signal from the control section 1, which means that the digital signal from the control section 1 is a control signal. Since the control section 1 is a digital circuit, problems arise in that signal delay occurs in a wiring section between the sensor and the control section and the control section is large-scaled and therefore the cost of the control section is high.Many prior art barrier systems have sought to provide some form of predetermined delineation of the area in which

 

 


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Polderbits Sound Recorder And Editor 9.0 Keygen.rar elletrud

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