| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely detect a current in both on and off command periods. <P>SOLUTION: In an on command period of a PWM driving signal, a control device 13 applies a current detected by a current detection circuit 14 and a supply voltage detected by a supply voltage detection circuit 15 to a voltage equation to calculate a resistance value and an inductance value of an on period current path. Resistance values and inductance values of paths other than a return path 12 are subtracted from those values to determine a resistance value and an inductance value of an off period current path. In an off command period, a resistance value R and an inductance value L of the off period current path, a forward voltage Vf of a diode 7, and the preceding current value determined in the preceding calculation are applied to the voltage equation to calculate a load current flowing through a linear solenoid 2 in succession. <P>COPYRIGHT: (C)2013,JPO&INPIT |
