My driver should mitigate an ecu output which is gonna bad but the machinery should still work until the ecu is not switched to a new one. To get the new ecu we have to wait several weeks, so we have no option, just to solve the problem in some way.
Then I come to the ide, ok, I could make a dimmer with a mosfet and pot. But after I go back to the machine and checked again the valve, I realized it is a proportional valve 12 VDC. And when I checked back here I saw also a writing about this type of valve, and links to the valve too.
I realized quickly does I have nothing to do with my dimmer stuff here.
And you suggested also to go to pwm controller.
I didn't design lot of electronics but I have some clue about and finished many project successfully, but I like to be careful, and like to hear others opinions as well before I burn down something.
I will solve my task with a pwm driver which I constructed many years ago, and I know it is good design cos I tested it many times in real situations, and also made measurements during the usage.
Thank you folks for such of nice infos, I really appreciate your time spent on my question.
My best regards.