Quote:
Originally Posted by ac7ss
What I want to do is make the computer think the brakes are applied without actually touching the brakes. Allowing auto stop to occur when it is supposed to and full regen braking up to that point. Yes, it is practically the same thing as lightly touching the brakes, but easier not to engage the hydraulic system.
The trouble is finding a dpdt on-(on) switch. Or making a relay circuit to allow a single switch to do all of the work. I want to do as little to the car as possible.
So, to re-iterate the question, Does the brake switch have to be closed before opening the auto-stop switch?
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Sorry, I looked at your question in two different ways....I wasn't sure if you wanted to:
1) Just to tap into the brake pedal switch and do Auto Stop as normal without using any friction braking until you press down on the brake further.
2) Go into AutoStop at anytime just by using a switch tapped into the brake pedal switch.
I tried to say that number 1 (first paragraph of reply) is basically the same as lightly touching the brake pedal.
I further went on to say that it would still only work at speeds below 5MPH and perhaps went way too deep in the following paragraphs thinking that you wanted to modify in order to do number 2.
Now that I know what you really want, I will try to make my answer more on topic
Maybe it is just a difference in switch adjustments from car to car but when I first slow down to go into AutoStop, I lightly touch the brakes to get max regen then as the car slows down to about 4MPH the start clutch disengages and I feel the car at that time needs more brake pedal pressure to stop the car even at that slow speed. This tells me that the hydraulic brakes either are not even applied at that point or not enough to make the car stop. To even make that point even bigger, in a normal auto braking system, it does not take much hydraulic pressure to stop a very light car going only 4MPH compared to what it takes going 50MPH.
If you feel that you are using too much hydraulic brakes, I don't know how you can prove it but it may just be the "sensation" of the combination of regen and the CVT still engaged that gives you the feeling that your hydraulic brakes are activated too much that makes you want to do this mod. If you keep the brake pedal pressure the same during the AutoStop and after you get to 4MPH, does your car roll even further from 4MPH to 0MPH? Mine does by alot so that means there is not enough hydraulic pressure to stop until I press down further on the pedal.
Here is one thing that you can try before tapping into wires and mounting a remote switch.....Those two switches on the brake pedal (yes MT owners - the CVT has two switches) can be height adjusted. So why don't you adjust each switch one by one (remember how many turns so you can go back to default position if you had to) and go out for a test drive. Once you get it so that the slightest pressure works for you, I think that you will like that instead of having to keep a switch pushed in while stopping.
To try and answer your other question, are both brake pedal switches involved to achieve an AutoStop? I don't know for sure but I think so. Here is why....I have another CVT mod that relaxes the CVT ratio a bit unless under heavy engine load or about 20 seconds after touching the brake pedal. One of the wires in the mod hooks up to the brake lights so it uses the brake pedal switch that controls the brake lights. On the circuit, I have a diode inline to the brake switch but it went defective. When that occurred, I could not get into AutoStop until I fixed that circuit. For that reason, I think both switches are used.
An easy way to tell for sure is to disconnect the brake light connector from the switch but leave the other switch in tact. Go down a road in your neighborhood (with no other cars around - because you don't have brake lights) and try an AutoStop with all of the conditions that a normal AutoStop would occur. That should answer your question for sure.
Hope that helps,
JoeCVT = Just your average CVT owner
