gas pedal "overtravel"?

shadonoz said:

Not thinking about braking, just acceleration. For instance, will the engine respond to full throttle differently [more quickly] if the pedal is rapidly depressed rather than gently but quickly [squeezed?]. Stomped rather than stepped on perhaps.

Maybe I just need to do more seat of the pants experimentation.

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minnesotaart said:

Try this to get an example of how it works. Find a decent uphill stretch of road where you can do about 30-40 mph (no traffic around is best, of course). First time up the hill, just hold the accelerator pedal steady. It won't downshift, it'll feel like it's bogging down. Slowly press the pedal to maintain your speed. You'll get up the hill just fine, but it won't downshift. Now, do it a second time and when it starts to bog, "stab" the pedal quickly about 1/2 way down, let it return to where you had it before and then hold it steady. It'll downshift and hold that lower gear all the way up as long as you hold the speed steady. Now do it a third time and when it bogs, floor it and have fun as you continue to accelerate all the way up! This is a very fun and intuitive transmission.

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shadonoz said:

I live up a hill, and mine does not behave that way. If I hold the throttle steady, it WILL downshift when it thinks it's bogging down, and if I give it a just little throttle, it will downshift. It is, after all, an "automatic" transmission. If I want to stay in 4 and avoid a downshift, I have to run it in manual.

But regardless, I'm just asking about the difference between when you squeeze the throttle vs stabbing it. Since this is a drive-by-wire system, I want to know if the system takes that into account and responds differently. I'm asking about the logic of the system.

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Anchorman said:

Mine would change down too.

I think you’re thinking too hard about what you would like to see. The pedal is dumb hardware with springs and detent to give it the right feel. The business part is the APP (accelerator pedal position) sensor which is really a potentiometer just like a volume dial - the more you turn, the louder it goes. The car employs a canbus system. It’s basically a two wire system where every component is wired together. When a signal goes out from an ecu, all the components get it but only the one it is digitally addressed to responds. The pedal is just on the other side of the bulkhead or firewall as you call it and is the drivers “volume switch”. I’ve trawled the info today and the only pdf along those lines is attached. Interestingly, the pedal input would be suppressed if it stuck wide open by pressing the brake. That would stop that Toyota sticking throttle fiasco. I’m afraid there’s nothing quite as dramatic or romantic as it being sensitive to how it is pressed. I’d love to help but it just isn’t there.

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Anchorman said:

Mine would change down too.

I think you’re thinking too hard about what you would like to see. The pedal is dumb hardware with springs and detent to give it the right feel. The business part is the APP (accelerator pedal position) sensor which is really a potentiometer just like a volume dial - the more you turn, the louder it goes. The car employs a canbus system. It’s basically a two wire system where every component is wired together. When a signal goes out from an ecu, all the components get it but only the one it is digitally addressed to responds. The pedal is just on the other side of the bulkhead or firewall as you call it and is the drivers “volume switch”. I’ve trawled the info today and the only pdf along those lines is attached. Interestingly, the pedal input would be suppressed if it stuck wide open by pressing the brake. That would stop that Toyota sticking throttle fiasco. I’m afraid there’s nothing quite as dramatic or romantic as it being sensitive to how it is pressed. I’d love to help but it just isn’t there.

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craigo said:

Could be what some people see as a pedal response is due to the transmission shift points are somewhat flexible... There is a documented reset procedure for re-learning them (and I've done it) - it's based on the pedal. In theory it seems like it would be possible to have the car respond differently depending on how the pedal is pressed, but this would be documented. The complexity there might also cause drivability issues.

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