SOLENOID VALVE DRIVE MECHANISM
PROBLEM TO BE SOLVED: To provide a solenoid valve drive mechanism surely detecting load short circuit of a solenoid composing a solenoid valve. SOLUTION: Count is started at detection timing of rising edge of energizing signal Pi or peak drive signal Pj2 (turn on of transistors Ti, Tj2) and is stopp...
Saved in:
Main Authors | , , |
---|---|
Format | Patent |
Language | English |
Published |
15.06.2006
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | PROBLEM TO BE SOLVED: To provide a solenoid valve drive mechanism surely detecting load short circuit of a solenoid composing a solenoid valve. SOLUTION: Count is started at detection timing of rising edge of energizing signal Pi or peak drive signal Pj2 (turn on of transistors Ti, Tj2) and is stopped at detection timing of a drop edge of peak drive signal Pj2 (turn off of the transistor Tj2). Consequently, a count value corresponding to rise time t1 from start of energizing the solenoid Li to achievement of peak value Ia in energizing current Id is obtained. Since as inductance of energizing route including the solenoid Li gets lower, rise and drop of wave form of energizing current Id flowing in the solenoid Li get earlier, load short circuit (drop of inductance) can be detected from change of the count value (rise time t1). COPYRIGHT: (C)2006,JPO&NCIPI |
---|---|
Bibliography: | Application Number: JP20040348808 |