So I have this aftermarket cruise control in my car that uses the speed signal from the car to set the speed. It does not use magnets on the driveshaft. The cruise control only starts working above 35 mph. Every cruise control I have ever used, factory or aftermarket, only worked from about 35mph and above. But I do a lot of driving below 35 mph and want to use the cruise control for it. So I'm hoping that if I measure the signal from the car with an oscilloscope it wil show either a chain of pulses or a voltage that changes with the speed. I looked online and found a couple frequency doubling circuits that look like they would work. I'm sure that the extra pulses the circuit would make must be evenly spaced between the pulses from the car for my scheme to work. And at least one of the circuits I found appears to do just that. If it is a rising voltage that I need to modify I'm not sure how I would do that. What if the rise with speed isn't linear? Anyway,any thoughts or advice? Any circuits that would work? Maybe a chip to do all the work? Thanks, Eric
- posted
10 years ago