Zf Cv Systems Europe Bv

Zf Cv Systems Global Gmbh

Zf Friedrichshafen Ag

Zf Cv Systems Hannover Gmbh

Lars Volker

Michael Haverkamp

Mirko Brütt

Ivo Laskawy

Jan Spremberg

Simon Pauka

Mirko BRÜTT

A method is disclosed for controlling the brakes of a vehicle combination that includes a tractor vehicle and at least one trailer vehicle. A brake control valve in the tractor vehicle has magnetic switching valves that controlled by an electronic control unit, including an inlet valve and an outlet valve. To determine a current trailer status, it is determined whether the tractor vehicle is connected to a trailer vehicle and/or the line volume of the brake control line. A target pressure to be produced in the brake control line is specified and is produced by pulse-like opening of the inlet valve and/or the outlet valve. The brake control pressure in the brake control line is measured during the pressure build-up of pressure and a characteristic value for the trailer status and/or for the line volume of the brake control line is determined.

Method for brake control of a vehicle combination

A method of brake control of a vehicle combination () composed of a tractor vehicle () with an electronically controlled braking system () and a trailer vehicle () with a pneumatically controlled pneumatic braking system (), involves introducing the brake control pressure (p) of the trailer vehicle () into a tractor brake control line () extending to a tractor vehicle-side 'brake' coupling head () via an electronically controlled trailer control valve () of the tractor vehicle (). At the beginning of a braking operation, a pressure pulse () exceeding a target brake control pressure (p) is introduced into the tractor brake control line (). The volume of a trailer brake control line () coupled to the “brake” coupling head () is ascertained, and the absolute value (Δp) and/or the duration (Δt) of the pressure pulse () introduced are/is established depending on the ascertained volume.

Method for the brake control of a vehicle combination

A valve arrangement () of a tractor vehicle () for controlling a pneumatic brake system of a trailer vehicle () includes a trailer control valve () with a reservoir pressure input (p) for the introduction of reservoir compressed air and a reservoir pressure output (p) for the controlled discharge of reservoir compressed air. The reservoir pressure output is pneumatically connected to a 'reservoir' coupling head () of the tractor vehicle. A shut-off and ventilation valve () is arranged in a reservoir pressure line () upstream of the “reservoir” coupling head. Before connecting an associated coupling head of the trailer vehicle () to the “reservoir” coupling head of the tractor vehicle, the feed of reservoir compressed air to the “reservoir” coupling head can be shut off to ventilate the “reservoir” coupling head. After reconnecting the associated coupling head, the “reservoir” coupling head can be charged again.

Valve arrangement of a towing vehicle for controlling a pneumatic brake system of a trailer vehicle and a method for controlling it

The invention relates to an electronically controllable secondary brake system (), operated by pressure medium, useable as both as a parking brake system and an auxiliary brake system, with spring brake cylinders () arranged on wheel brakes of at least one vehicle axle (), with a directly or indirectly electronically controllable brake control valve (). The brake force of the spring brake cylinder () can be reduced by a feed of pressure medium and can be increased by a discharge of pressure medium, and with an electronic brake control unit () for controlling the brake control valve () dependent on the current value of a brake value signal (SBW). The brake control valve () is configured as a 3/3-way proportional valve with a pressure medium inlet, a pressure medium outlet, and a working connector, which is connected via a working line () to the spring brake cylinders.

Secondary brake system of a vehicle, and method for controlling it

A power brake system () of a vehicle () has a pressure medium source () and a pressure-medium-operated primary brake system () operable as a service brake and steering brake system. The primary brake system has at least one foot brake valve () and two wheel brake cylinders () arranged on both sides on a drive axle () and operable independently of one another. A pressure-medium-operated secondary brake system (), operable independently of the primary brake system (), has a brake control valve () and at least one brake cylinder (. The secondary brake system () is electronically controllable and has a brake control valve () configured as a solenoid valve. The braking force of the at least one brake cylinder () can be set by feeding or removing pressure medium to or from the latter via the brake control valve ().

Power brake system of a vehicle and method for controlling same

A valve arrangement () of a hydraulically braked tractor vehicle for controlling the brake pressure of a pneumatically braked trailer includes an electronically controlled trailer control valve () with an inlet valve (), an outlet valve (), a pneumatical relay valve (), a breakaway valve () and a brake control pressure sensor (). The valve arrangement also has a hydraulically controlled backup valve () with a hydraulically activated relay valve (), a redundancy valve (') and a hydraulic control pressure sensor (). Output-side brake control lines () are connected via a shuttle valve () to a brake coupling head (). The valves () and the pressure sensors () of the trailer control valve (), the valves (&#x2032;) of the backup valve () and the shuttle valve () may be combined in one trailer control module () with a single housing ().

Growing community of inventors

Seelze, Germany

Lars Volker