Method and control device for operating a vehicle brake system equipped with an electrohydraulic brake booster device

A control device or a vehicle brake system equipped with an electrohydraulic brake booster device, comprising:

• control electronics by which, during an actuation of a brake actuating element by a driver of the vehicle and during a corresponding brake pressure increase brought about at least partly by the electrohydraulic brake booster device in at least one wheel brake cylinder of the brake system, at least one closing signal is outputted to at least one separating valve of the brake system, via which separating valve the at least one wheel brake cylinder is hydraulically connected to a master brake cylinder of the brake system, the outputting taking place in such a way that the at least one wheel brake cylinder is decoupled from the master brake cylinder;
• wherein the control electronics is designed to ascertain, before an outputting of the at least one closing signal, whether at least one of:
• i) at least one ascertained or received first quantity relating to an actuation speed of the actuation of the brake actuating element, and ii) at least one ascertained or received second quantity relating to a master brake cylinder pressure increase in the master brake cylinder brought about by the actuation of the brake actuating element, is within at least one specified normal value range, and, if so, to output the at least one closing signal without a delay, and otherwise to delay the output of the at least one closing signal taking into account at least one of the at least one second quantity and at least one ascertained or received third quantity relating to the brake pressure increase brought about at least partly by the electrohydraulic brake booster device.

A brake system for a vehicle, comprising:

• a control device or a vehicle brake system equipped with an electrohydraulic brake booster device, the control device including control electronics by which, during an actuation of a brake actuating element by a driver of the vehicle and during a corresponding brake pressure increase brought about at least partly by the electrohydraulic brake booster device in at least one wheel brake cylinder of the brake system, at least one closing signal is outputted to at least one separating valve of the brake system, via which separating valve the at least one wheel brake cylinder is hydraulically connected to a master brake cylinder of the brake system, the outputting taking place in such a way that the at least one wheel brake cylinder is decoupled from the master brake cylinder, wherein the control electronics is designed to ascertain, before an outputting of the at least one closing signal, whether at least one of:
• i) at least one ascertained or received first quantity relating to an actuation speed of the actuation of the brake actuating element, and ii) at least one ascertained or received second quantity relating to a master brake cylinder pressure increase in the master brake cylinder brought about by the actuation of the brake actuating element, is within at least one specified normal value range, and, if so, to output the at least one closing signal without a delay, and otherwise to delay the output of the at least one closing signal taking into account at least one of the at least one second quantity and at least one ascertained or received third quantity relating to the brake pressure increase brought about at least partly by the electrohydraulic brake booster device;
• the at least one separating valve via which the at least one wheel brake cylinder is hydraulically connected to the master brake cylinder, and which can be controlled into its closed state via the at least one closing signal of the control device, whereby the at least one wheel brake cylinder can be decoupled from the master brake cylinder;
• and
• the electrohydraulic brake booster device, by whose operation the brake pressure increase can be at least partly brought about in the at least one wheel brake cylinder decoupled from the master brake cylinder by the closing of the at least one separating valve.