Adaptive cruise control braking system design - 2017+ Chrysler Pacifica Minivan Forums
 
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post #1 of 2 (permalink) Old 05-18-2019, 02:53 PM Thread Starter
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Adaptive cruise control braking system design

I’m looking for some info about the Adaptive Cruise Control (ACC) braking system on my 2017 Pacifica.
Does anyone know whether the brake pedal on my car is mechanically connected to the brake master hydraulic cylinder in the normal way or if it is a “fly-by-wire” or perhaps more accurately a “brake-by-wire” (BBW) control connected to one of the computers on board which in turn applies the brakes as required when the ACC is activated?
In a BBW system, there would have to be a pump and/or reserve pressure container to provide the required hydraulic pressure to operate the brakes or a mechanical means at each wheel to activate the brakes. Although the later would eliminate the need for a hydraulic brake system, it doesn’t seem feasible.
If my car does not have a BBW system, I assume the pedal operates the brake master hydraulic cylinder as in a normal car. With the addition of an ACC system, a way to both generate and modulate the pressure in the brake hydraulic lines would also be required in the system.
A BBW system should make it easy to add an auxiliary braking control compared with a traditional system with the brake pedal connected to a master cylinder. A schematic diagram of the complete ACC braking system would be most helpful. Anyone know of one out there someplace?
I am going to contact my local Chrysler service manager to see what information they can provide. Many thanks.
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post #2 of 2 (permalink) Old 05-19-2019, 01:46 AM
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Originally Posted by ralphedel View Post
I’m looking for some info about the Adaptive Cruise Control (ACC) braking system on my 2017 Pacifica.

Does anyone know whether the brake pedal on my car is mechanically connected to the brake master hydraulic cylinder in the normal way or if it is a “fly-by-wire” or perhaps more accurately a “brake-by-wire” (BBW) control connected to one of the computers on board which in turn applies the brakes as required when the ACC is activated?

In a BBW system, there would have to be a pump and/or reserve pressure container to provide the required hydraulic pressure to operate the brakes or a mechanical means at each wheel to activate the brakes. Although the later would eliminate the need for a hydraulic brake system, it doesn’t seem feasible.

If my car does not have a BBW system, I assume the pedal operates the brake master hydraulic cylinder as in a normal car. With the addition of an ACC system, a way to both generate and modulate the pressure in the brake hydraulic lines would also be required in the system.

A BBW system should make it easy to add an auxiliary braking control compared with a traditional system with the brake pedal connected to a master cylinder. A schematic diagram of the complete ACC braking system would be most helpful. Anyone know of one out there someplace?

I am going to contact my local Chrysler service manager to see what information they can provide. Many thanks.
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