Method for controlling brakes
Disclosed is a method for automatically controlling brakes in a trailer vehicle having antilock control, wherein wheel rotational speeds are continuously monitored and evaluated at wheels having antilock control. According to the method, lateral acceleration and longitudinal acceleration of the trailer vehicle are determined. If a predefined, critical lateral acceleration is exceeded, an automatic braking process occurs. A control unit and trailer vehicle are also disclosed in connection with the inventive method.
1. A method for the automatic actuation of brakes in a trailer vehicle with antilock control, wherein wheel revolution rates on wheels with antilock control are continuously monitored and analyzed by the trailer vehicle, said method comprising:
a) determining a lateral acceleration a Q and a longitudinal acceleration a L of the trailer vehicle,
b) on exceeding a predefined, critical lateral acceleration a Qkrit , carrying out an automatic braking process comprising:
b1) increasing a brake pressure on a side of the trailer vehicle on an inside of a turn incrementally over a plurality of pressure steps,
b2) checking in each of the plurality of pressure steps whether a longitudinal acceleration limit a Lkipp is reached, and
b3) checking in each of the plurality of pressure steps whether wheels on the inside of the turn lock or the antilock control engages for wheels on the inside of the turn, wherein
b31)—if wheels on the inside of the turn lock or the antilock control engages for wheels on the inside of the turn before a Lkipp is reached, the method further comprises starting deceleration braking at least on a side of the trailer vehicle on an outside of the turn, and
b32)—if a Lkipp is reached without wheels on the inside of the turn locking or the antilock control engaging for wheels on the inside of the turn, the method further comprises terminating the braking process.
2. The method as claimed in claim 1 , wherein deceleration braking according to step b31 is terminated once the lateral acceleration a Q is less than a critical lateral acceleration a QKRIT .
3. The method as claimed in claim 1 , wherein after terminating the braking process according to step b32, the automatic braking process is only initiated again according to b,
if the lateral acceleration a Q has continued to increase and exceeds the critical lateral acceleration a QKRIT by a defined magnitude, or
if the trailer vehicle has travelled a defined distance since the last braking process according to b and the lateral acceleration a Q is still greater than the critical lateral acceleration a QKRIT .
4. The method as claimed in claim 1 , wherein increasing the brake pressure on the side of the trailer vehicle on the inside of the turn is carried out in small steps.
5. The method as claimed in claim 4 , wherein the small steps are from 0.1 to 0.2 bar.
6. A trailer vehicle with a brake system for carrying out the method as claimed in claim 1 .
7. A control unit for carrying out the method as claimed in claim 1 .
8. A trailer vehicle comprising the control unit of claim 7 .