General Cruise Controller

[Ralf S.]

My new beast has a Cruise Control doodah which is quite useful. It's not adaptive.. but I can set it at a particular speed, and then just occasionally tweak it using the +/- buttons as I need to.

But I have a question aboot how it works. I guess when I increase the speed, the CC just gives the motor more gas and it accelerates.. but how does the car slow down? If I take off a few mph quickly, I can feel the car slow down as if I applied the brakes. By contrast, turning off the CC just makes the car slow down as if I'd lifted my foot off the gas.. so it slows down, but as you might expect with no gas, rather than more abruptly.

Does the CC brake the car (would the brake lights come on?) or what is it doing? Just curiouse.


Ralf S.

 

[RichardH13]

Not sure on the slowing down side, the ECU controls the lot, I suppose, but I doubt the brakes are applied.

I hardly use cruise, the Tipo had it as well. I find there is too much traffic

On my Sport, I use the speed limiter function, it gives more controllability on our busy roads

 

[s130]

I don't think Cruise Control applies any adaptive braking.

Suggest you find a steep hill where say in 5th/6th gear and foot off throttle the car wants to speed up. Now repeat with Cruise Control engaged. Does the car still speed up?

Get someone to follow you to see if the brake lights come on as they do on trucks with speed limiters.

For the 500X you also have a speed limiter but this is a warning only system which can be over ridden.

Technical Quote:

SPEED LIMITER This device allows the speed of the vehicle to be limited to values which can be set by the driver. The maximum speed can be set both with car stationary and in motion. The minimum speed that can be set is 30 km/h. When the device is active, the car speed depends on the pressure at the accelerator pedal, until the set speed limit is reached. If necessary (in the event of overtaking for example), the programmed speed limit can be exceeded by fully depressing the accelerator pedal. By gradually reducing the pressure on the accelerator pedal, the function will be reactivated as soon as the car speed drops below the set speed. If the electronic Cruise Control has been activated previously, the S.L. button must be pressed twice. The first press deactivates the Cruise Control function, the second press activates the Speed Limiter

 

[chris3234]

I don't think Cruise Control applies any adaptive braking.

Suggest you find a steep hill where say in 5th/6th gear and foot off throttle the car wants to speed up. Now repeat with Cruise Control engaged. Does the car still speed up?

Get someone to follow you to see if the brake lights come on as they do on trucks with speed limiters.

For the 500X you also have a speed limiter but this is a warning only system which can be over ridden.

Technical Quote:

SPEED LIMITER This device allows the speed of the vehicle to be limited to values which can be set by the driver. The maximum speed can be set both with car stationary and in motion. The minimum speed that can be set is 30 km/h. When the device is active, the car speed depends on the pressure at the accelerator pedal, until the set speed limit is reached. If necessary (in the event of overtaking for example), the programmed speed limit can be exceeded by fully depressing the accelerator pedal. By gradually reducing the pressure on the accelerator pedal, the function will be reactivated as soon as the car speed drops below the set speed. If the electronic Cruise Control has been activated previously, the S.L. button must be pressed twice. The first press deactivates the Cruise Control function, the second press activates the Speed Limiter

Regular cruise does not brake the car


However if you have radar cruise with the ability to set a follow distance they will apply the brake to maintain the distance