General > General Technical Chat

Throttle Controllers

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amyk:
Electric vehicles don't have to worry about emissions, and motors can provide full torque at 0 RPM. I haven't touched a Tesla but have tried a trolleybus before, they have a surprisingly large amount of torque for such a huge vehicle and can accelerate ridiculously fast.

tom66:
I drive a hybrid that has a 'sport' mode (GTE) and a normal hybrid mode.

The normal hybrid mode has deliberate lag applied to it - ie you put your foot down and it waits a bit before it selects the lower gear and accelerates up.  I think this is designed to improve fuel economy with twitchier drivers, but it's damn annoying if you actually know how to drive. 

I end up just switching it to 'sport' when I want the extra responsivity, then take it out of this mode when I don't.

Interestingly the adaptive cruise control is also more aggressive in 'sport' mode.  But, the output power is the same (204 PS/150kW) in all modes, so 'sport' is an illusion, provided you don't mind the slightly slower throttle map. 

Circlotron:
One nice thing about drive by wire - adding a cruise control function is simply a bit of extra code in the ECU. Everything else is already there.

james_s:
I don't know that it really makes much difference for that, even on older cars cruise control is not exactly complicated. Mine consists of a control box that gets a signal from the speedometer, switches on the brake and clutch pedals, a vacuum servo connected to the throttle spool and a little vacuum pump/solenoid valve. Drive by wire adds complexity over a throttle cable, being able to add cruise control at that point isn't really gaining anything.

tom66:
Adaptive cruise control is quite clever though.  I've always wondered how my car knows exactly how much to brake and accelerate by, in stop-start traffic for instance it gets the braking to a stop and acceleration almost perfect.  It can get a bit rough if someone cuts in, then it brakes harder than usual but that's probably a safety system given the radar doesn't see the other car until they get past about 25% of my vehicle so it would end up braking later than an attentive driver.  And sometimes it rolls back very slightly on a hill before setting off, but only intermittently, like it's not quite sure how much acceleration to use.

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