# US 2019/0315328 A1 · Method for determining a control signal for an electronically controllable pressure medium control valve of an electronically slip-controllable power braking system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0315328 A1 - Document ID: US20190315328A1 - Status: Published application - Kind: A1 - Application number: 16/380,377 - Filed: 2019-04-10 - Published: 2019-10-17 - Earliest claimed: 2018-04-12 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Andrej Gardt; Christoph Eisele; Valentin Schubitschew; Volker Edelmann - Web page: https://patentgrep.com/patent/US20190315328A1 ## CPC - B60T 7/042: {by electrical means, e.g. using travel or force sensors} - B60T 13/68: by electrically-controlled valves {(B60T13/662 and B60T13/665 take precedence)} - B60T 13/146: {Part of the system directly actuated by booster pressure} - B60T 13/662: {characterised by specified functions of the control system components} - B60T 13/686: {in hydraulic systems or parts thereof} - B60T 13/745: {acting on a hydraulic system, e.g. a master cylinder} - B60T 15/36: Other control devices or valves characterised by definite functions {(electrically controlled valves in fluid-pressure brake systems B60T15/027, B60T15/028)} - F16D 65/28: arranged apart from the brake - B60T 2201/12: Pre-actuation of braking systems without significant braking effect; Optimizing brake performance by reduction of play between brake pads and brake disc - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A method is described for determining a control signal for a controllable pressure medium control valve of an electronically slip-controllable power braking system. The underlying power braking system is equipped with an actuating unit including a displaceable actuating element, the displacement of the actuating element determining a throughput of pressure medium through the pressure medium control valve. In the opened state, the pressure medium flowing through the pressure medium control valve causes flow forces on a valve closing element. Under certain circumstances, these flow forces have a closing effect on the valve closing element, thus throttling the possible pressure medium throughput, and cause undesirably high pressure differences in the interior of the pressure medium control valve. To avoid these effects, it is provided that the pressure medium control valve be controlled using a control signal dependent on the speed of an actuation of the actuating element. ## Claims ### Claim 1 A method for determining a control signal for an electronically controllable pressure medium control valve of an electronically slip-controllable power braking system, comprising: actuating the power braking system being with the aid of a displaceable actuating element; detecting, by a sensor unit, an actuating travel of the actuating element over time, wherein the sensor unit forwards the actuating travel to an electronic control unit for brake pressure control of the power braking system; ascertaining, by the electronic control unit, a speed at which the actuating element is displaced; and controlling the pressure medium control valve by the electronic control unit using a first control signal that is dependent on the ascertained speed of the actuating element. ### Claim 2 (depends on 1) The method as recited in claim 1, wherein: the actuating travel extends between a starting position and a variably settable actuation position of the actuating element, a second control signal that is independent of the speed of the actuating element is output to the pressure medium control valve in response to the actuating element moving from the starting position in a direction of the actuation position, and the first control signal dependent on the speed is output to the pressure medium control valve in response to the actuating element moving from the actuation position back in the direction of the starting position. ### Claim 3 (depends on 1) The method as recited in claim 1, further comprising: outputting, by the electronic control unit, a third control signal adapted to the speed of the actuating element to the pressure medium control valve in response to the ascertained speed of the actuating element exceeding a threshold value stored in the electronic control unit. ### Claim 4 (depends on 1) The method as recited in claim 1, wherein an increase in the third control signal is output to the pressure medium control valve by the electronic control unit with increasing speed of the actuating element. ### Claim 5 (depends on 1) The method as recited in claim 1, wherein a current strength by which the pressure medium control valve is controlled by the electronic control unit is used as the first control signal. ### Claim 6 (depends on 1) The method as recited in claim 1, further comprising: controlling a pressure medium connection of an actuatable master brake cylinder to a pedal travel simulator of the power braking system using the pressure medium control valve. ### Claim 7 (depends on 1) The method as recited in claim 1, further comprising: actuating a valve closing element of the pressure medium control valve, the pressure medium control valve having a bidirectional flow-through, wherein: the valve closing element is switchable from a basic position in which the pressure medium control valve is impenetrable by a pressure medium into another switch position in which the pressure medium control valve is penetrable by the pressure medium.