Method for controlling a motor vehicle service brake device and service brake valve device for said type of service brake device

Patent metadata

Field	Value
Publication number	US-10399550-B2
Application number	US-201715439184-A
Country	US
Kind code	B2
Filing date	Feb 22, 2017
Priority date	Aug 22, 2014
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A method for controlling a pneumatic or electro-pneumatic service brake device of a vehicle is provided. In the method a driver brake request occurs by actuating a service brake actuating element of a service brake valve device of the braking device. In response to actuating the service brake actuating element, at least one control piston of the service brake valve device is loaded with a first actuating force in order to generate a pneumatic brake pressure or brake control pressure in at least one pneumatic service brake circuit of the service brake device. The control piston directly or indirectly controls at least one double-seat valve of the service brake valve device. The at least one double-seat valve includes an inlet seat and an outlet seat. The at least one control piston of the service brake valve device in addition is loaded by a second actuation force additionally or instead of the first actuation force. The second actuation force, which is generated independently of a driver braking request, is applied to the at least one control piston in parallel to the first actuation force, either in the same direction or in the counter direction.

First claim

What is claimed is:

1. A method for controlling a pneumatic or electropneumatic service brake device of a vehicle including a service brake valve device having a service brake actuation element, the service brake valve device including at least one control piston arranged to directly or indirectly control at least one double-seat valve having an inlet seat and an outlet seat and being arranged to control a pneumatic brake pressure or brake control pressure in at least one pneumatic service brake circuit of the service brake device, the method comprising the acts of:
subjecting the at least one control piston to a first actuation force generated by the service brake actuating element in response to a driver braking demand, wherein a range of the driver braking demand includes no braking demand;
subjecting the at least one control piston to a second actuation force applied to the at least one control piston parallel to an actuation direction of the first actuating force, the second actuation force being generated by an electronic control device independently of the driver braking demand; and
generating a pneumatic brake pressure or brake control pressure in the at least one pneumatic service brake circuit of the service brake device in response to actuation of the at least one control piston by the first actuation force and the second actuation force,
wherein
the second actuation force is applied in the same direction as the first actuation force or in the opposite direction from the first actuation force,
the second actuation force is generated directly or indirectly pneumatically by at least one electropneumatic solenoid valve device outputting a control pressure in response to a signal of the electronic control device controlled by the electronic control device, and
the control pressure is regulated by the electronic control device.

2. The method as claimed in claim 1 , wherein the second actuation force is generated in response to a signal from the electronic control device based on driving operation conditions.

3. The method as claimed in claim 1 , wherein the second actuation force is generated in response to a signal from the electronic control device based on a control signal output by a driver assistance system.

4. A method for controlling a pneumatic or electropneumatic service brake device of a vehicle including a service brake valve device having a service brake actuation element, the service brake valve device including at least one control piston arranged to directly or indirectly control at least one double-seat valve having an inlet seat and an outlet seat and being arranged to control a pneumatic brake pressure or brake control pressure in at least one pneumatic service brake circuit of the service brake device, the method comprising the acts of:
subjecting the at least one control piston to a first actuation force generated by the service brake actuating element in response to a driver braking demand, wherein a range of the driver braking demand includes no braking demand;
subjecting the at least one control piston to a second actuation force applied to the at least one control piston parallel to an actuation direction of the first actuating force, the second actuation force being generated by an electronic control device independently of the driver braking demand; and
generating a pneumatic brake pressure or brake control pressure in the at least one pneumatic service brake circuit of the service brake device in response to actuation of the at least one control piston by the first actuation force and the second actuation force,
measuring as an actual variable at least of the second actuation force acting on the at least one control piston, an actuation travel of the at least one control piston resulting from the second actuation force, and a variable on which the generation of the second actuation force is based;
comparing with the electronic control unit the actual variable to a setpoint variable;
adjusting the signal from the electronic control unit to regulate the second actuation force to align the actual variable with the setpoint variable,
wherein the second actuation force is applied in the same direction as the first actuation force or in the opposite direction from the first actuation force.

5. A method for controlling a pneumatic or electropneumatic service brake device of a vehicle including a service brake valve device having a service brake actuation element, the service brake valve device including at least one control piston arranged to directly or indirectly control at least one double-seat valve having an inlet seat and an outlet seat and being arranged to control a pneumatic brake pressure or brake control pressure in at least one pneumatic service brake circuit of the service brake device, the method comprising the acts of:
subjecting the at least one control piston to a first actuation force generated by the service brake actuating element in response to a driver braking demand, wherein a range of the driver braking demand includes no braking demand;
subjecting the at least one control piston to a second actuation force applied to the at least one control piston parallel to an actuation direction of the first actuating force, the second actuation force being generated by an electronic control device independently of the driver braking demand; and
generating a pneumatic brake pressure or brake control pressure in the at least one pneumatic service brake circuit of the service brake device in response to actuation of the at least one control piston by the first actuation force and the second actuation force,
wherein
the second actuation force is applied in the same direction as the first actuation force or in the opposite direction from the first actuation force, and
the second actuation force is generated in a manner dependent on at least one of a degree of actuation of the service brake actuation element and on a braking amount of at least one of a permanent brake and a generator brake of the vehicle.

6. The method as claimed in claim 5 , wherein the second actuation force increases as the degree of actuation of the service brake actuation element or the braking amount of the permanent brake increases.

7. The method as claimed in claim 1 , wherein
the service brake valve device generates a brake pressure or a brake control pressure for each service brake circuit based at least in part on the second actuation force, and
the brake pressure or brake control pressure for each service brake circuit is controlled on a wheel brake-specific basis by ABS valves arranged in respective brake pressure lines between the service brake valve device and the respective wheel brake connected to each service brake circuit.

8. A service brake valve device for a pneumatic or electropneumatic service brake device of a vehicle, comprising:
a service brake actuation element configured receive a driver braking demand;
at least one control piston actuable by the service brake actuation element in response to the driver braking demand;
at least one double-seat valve configured to be directly or indirectly controlled by the at least one control piston, the at least one double-seat valve including an inlet seat in communication with a compressed air supply port of the service brake device and an outlet seat in communication with a pressure sink;
second actuation force control means configured to receive via an interface at least one signal indicative of driving operating conditions and to control generation of a second actuation force based on the received at least one signal independent of the driver braking demand, the second actuation force being aligned to act on the at least one control piston in parallel to a direction of t

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Hecker Falk
• Roether Friedbert
• Schmauider Thilo

Classifications

• B60T8/342

  Pneumatic systems · CPC title

• B60T13/261 Primary

  systems with both indirect application and application by springs or weights and released by compressed air · CPC title

• B60T15/043 Primary

  controlling service pressure brakes (B60T15/048 takes precedence) · CPC title

• B60T15/041

  controlling auxiliary pressure brakes, e.g. parking or emergency brakes (B60T15/048 takes precedence) · CPC title