The simplest form of start-up assistance on the mountain you can see in the video below. We see a couple that has learned pragmatically to deal with its weaknesses. If they also succeed like this in the rest of life, you might still learn much from them.

Because in real life, such prudent passengers are rare, the engineers have devised electronic aids the, as so often, replace human weaknesses. They emanate from the difference between ESP and ABS. For the first time at ESP namely takes place a braking by the system. When necessary, ABS reduces only the braking pressure.

And this feature of ESP can be used in our case to protect against rolling back. The engineers had to add up only software until now. Now, however, additional sensors are necessary. Because releasing the brake at the right time is not so simple. For example, the ABS sensors are still too imprecise and in the classical construction method, they provide no signal when almost stationary.

Thus, the problem is to release the brake in a way that the car then rides really forward. Now, you might say, then we will release it as late as possible. But thereby, the brakes would unnecessarily burdened and the brake discs maybe also. By the way, VW for example, even makes dependent the accomplishment of the action from a 'round running' engine. The will thus additionally tested.

You guessed already what is needed here. Right, it's the CAN bus, by the way, at some models even a 'private' only between two to three control devices. So ABS sensors are suitable, the do not operate according to the inductive principle, but the Hall principle. They have a supply voltage and report wheel movements of a few degrees.

Special encoders on the clutch cylinder or its clutch pedal then here are still possible. No, of course not the previous ones. The new often have up to three reporting points and also work according to the Hall principle. The middle seems to be the one who informs best about the pressure point. And then there are the sensors shown here, which operate according to the Coriolis principle.

These sensors are of such a high resolution that they already respond to accelerations of ± 0.1 g. If multiple sensors are present on a PCB, is this called a 'cluster'. This second combination of sensors can record more signals than just would be needed for the hill start assistance, e.g., the necessary for ESP and active steering. Also, it may communicate directly with the CAN-bus, but needs very little current (200 mA).

The brake which is actuated by the ESP control unit is referred to as 'hydraulic'. However, many vehicles have meanwhile already an electric parking brake. Which will operated via a switch and creates space on the center console due to lack of handbrake lever. It can act on the rear disc brakes or else on an in this integrated drum brake. Since it is completely independent of the brake hydraulics, it is called 'electric'.

Below depending on the manufacturer different speed limits, the electric parking brake is used. The hill start assistant releases the brake, for example, at the manual gearbox during engaging and at the automatic, if the brake is released. If you give the system a little time, it will save you excessive wear. Some manufacturers also interrogate brake pedal and clutch pedal. Here really worth taking a look at the manual. 05/14