PWM Solenoid frequency
PWM Solenoid frequency
(OP)
Hello
I am engaged in repairing automotive automatic transmission, I have noticed that PWM solenoids are driven at many different Htz, although their external appearance is much the same. to date I cant find a reasonable answer for the difference & why, Closest I come to an answer is that there may be a difference in the spring/valve harmonics ???? BUT I am not certain, so here I am asking the experts <G>
Thanks in anticipation
Bob Ryan
I am engaged in repairing automotive automatic transmission, I have noticed that PWM solenoids are driven at many different Htz, although their external appearance is much the same. to date I cant find a reasonable answer for the difference & why, Closest I come to an answer is that there may be a difference in the spring/valve harmonics ???? BUT I am not certain, so here I am asking the experts <G>
Thanks in anticipation
Bob Ryan





RE: PWM Solenoid frequency
Mike Halloran
Pembroke Pines, FL, USA
RE: PWM Solenoid frequency
These Solenoids have a set frequency plus a variable pulse width to control valve position & hence the flow of oil. My query is, Why are these driven at different frequencies? The duty cycle varies in the normal way at 0 to 100%
Thanks in anticipation
Bob Ryan
RE: PWM Solenoid frequency
Is the PWM control in the electric level to control average driving voltage or the solenoid/valve plunger is moving/vibrating in an on-off fashion to control average pressure and fluid flow?
RE: PWM Solenoid frequency