Traction control with a cable throttle?

[andythelandy]

Picked up my girlfriends new car the other day (Mazda 3 2.0) and noticed that it has a cable throttle like a lot of Japenease stuff still tends too.

Then I realised that it also has traction control and wonder how it can back off the throttle when you still have your foot mashed to the floor I thought the main reason for most cars having fly by wire now was so that systems like traction control can be used?

 

[haaammit]

Some older systems use the brakes for traction control, I know my car does.

 

[Rainagul]

The ECU more than likely cuts power (torque) to the engine and operates the brakes slightly to stop wheel spin.

 

[sovietspybob]

perhaps it just cuts the ignition? Some of the Japanese TC units are fairly brutal in their approach of sense any slip at all = totally cut all power. The TC on our Clio 197 is about 10 thousand times better than that of the same year MX5.

 

[Dale V]

It'll have a secondary butterfly on the throttle body thats controlled electronically

 

[andythelandy]

It'll have a secondary butterfly on the throttle body thats controlled electronically

This is what I think is most likely its not an ignition cut I don't think its actually a much better system than the one on my seat Leon.

 

[Lashout_UK]

Picked up my girlfriends new car the other day (Mazda 3 2.0) and noticed that it has a cable throttle like a lot of japenease stuff still tends too.

Then I realised that it also has traction control and wonder how it can back of the throttle when you still have your foot mashed to the floor I thought the main reason for most cars having fly by wire now was so that systems like traction control can be used?

It's done be controlling the spark and fuel instead - just cut the spark and fuel, or change the timing, voila, no power. Electronic throttles are primarily for improved engine management, I believe, rather than just solely for stability control purposes - although obviously they make that much easier.

You can get traction control systems that physically change the position of the throttle though, even in cable applications. The Corvette C4 with the LT1 engine had such a system; I loved it because it would actually move the throttle pedal away and consequently give you physical feedback. It too cut spark and fuel though, to protect the engine and for various other reasons.

 

[DaveyD]

It'll likely cut the spark or injection of fuel

 

[andythelandy]

It's done be controlling the spark and fuel instead - just cut the spark and fuel, or change the timing, voila, no power. Electronic throttles are primarily for improved engine management, I believe, rather than just solely for stability control purposes - although obviously they make that much easier.

You can get traction control systems that physically change the position of the throttle though, even in cable applications. The Corvette C4 with the LT1 engine had such a system; I loved it because it would actually move the throttle pedal away and consequently give you physical feedback. It too cut spark and fuel though, to protect the engine and for various other reasons.

So the pedal would actually move under your foot? I remember my brothers Mondeo did this with cruise control I found it very disconcerting when the pedal would dissapear from under my foot!

 

[snapdragon69]

Most have two way intervention, they will cut power first by way of a quotient and if wheel slip still occurs, then individual wheels will be braked appropriately. How successful this partly depends on the ABS actuation rate.

I doubt they will cut inanition as this would cause damage to the catalytic converter, as might reducing fuelling while the throttle is open. It all sounds a little primitive as Japanese cars tend to be trailing edge technology which has been made reliable.