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US 9,776,611 B2Granted
Method for controlling a pneumatic brake system and a pneumatic brake system for a vehicle
AssigneeWABCO GmbH
InventorsThomas Lenz, Gerd Roters
Life of this patent
Estimating the term…
Abstract
The application discloses a method for controlling a pneumatic brake system of a vehicle. The method includes the step of modulating a pilot-control brake pressure by means of an electropneumatic pilot-control valve in venting phases and bleeding phases. The method also includes the step of feeding in the pilot-control pressure via a pilot-control line for outputting a brake pressure to wheel brakes of the vehicle.
Claims20
A method for controlling a pneumatic brake system of a vehicle, the method including the steps of:
- modulating a pilot-control brake pressure by means of an electropneumatic pilot-control valve in venting phases and bleeding phases;
- and
- feeding in the pilot-control pressure via a pilot-control line for outputting a brake pressure to wheel brakes of the vehicle;
- wherein the pilot-control valve is modulated from a bled state in alternating venting phases and bleeding phases in order to automatically modulate a median pilot-control pressure level, in such a way that the pilot-control pressure is increased in the venting phases, and decreased in the bleeding phases;
- wherein, when an automatic braking process is initiated from a braking-free state, the median pilot-control pressure level is set by means of a plurality of switching periods, each with a venting phase by increasing the pilot-control pressure present in the pilot-control line, and a subsequent bleeding phase by reducing the pilot-control pressure;
- wherein the median pilot-control pressure level is set in a setting time which is longer than the switching period.
3 more elements
A pneumatic brake system for a vehicle, wherein the brake system comprises:
- an electronic brake control device for receiving a driver's braking request signal and for carrying out an automatic brake control method by outputting brake signals and pilot-control brake signals,
- a pilot-control line, brake lines and pneumatic wheel brakes which are connected to the brake lines,
- at least one check valve which is connected directly or indirectly to the pilot-control line, receives a fed-through pilot-control pressure and sets a brake pressure in the connected brake line,
- a pilot-control valve for outputting a pilot-control pressure to the pilot-control line as a function of the pilot-control brake signals,
- wherein, in order to automatically modulate a median pilot-control pressure level in the pilot-control line, the electronic brake control device alternately outputs pilot-control brake signals to the pilot-control valve in a switching period in such a way that the pilot-control pressure level modulates the pilot-control valve from a bled state in alternating venting phases and bleeding phases, and in the process increases the pilot-control pressure in the venting phases and decreases it in the bleeding phases, wherein the electronic brake control device is configured to automatically modulate a median pilot-control pressure level in a setting time which is longer than the switching period.
2 more elements
Dependencies are inferred from the claim text.