# US 2014/0156161 A1 · Brake control device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0156161 A1 - Document ID: US20140156161A1 - Status: Published application - Kind: A1 - Application number: 14/233,668 - Filed: 2011-07-19 - Published: 2014-06-05 - Earliest claimed: 2011-07-19 - Assignees: Toyota Jidosha Kabushiki Kaisha - Inventors: Yusuke Kamiya; Takahiro Okano - Web page: https://patentgrep.com/patent/US20140156161A1 ## CPC - B60T 13/686: {in hydraulic systems or parts thereof} - B60T 7/04: foot actuated - B60T 8/4081: {Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence)} - B60T 13/662: {characterised by specified functions of the control system components} - B60T 2270/402: Back-up - B60T 2270/604: Merging friction therewith; Adjusting their repartition - 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 ## Abstract When a brake ECU is started up rapidly by a brake pedal operation, the brake ECU executes a depression force fluid pressure mode. When the control pressure detected by a control pressure sensor becomes smaller than a switching determination threshold value, the brake ECU determines that an operation of returning a brake pedal is being performed, and switches the braking mode from the depression force fluid pressure mode to a normal control mode. Accordingly, even when the operation of a stroke simulator has been started, no uncomfortable feeling is given to a driver. Further, even when the operation of returning the brake pedal is not being performed, the braking mode is switched from the depression force fluid pressure mode to a simulator non-operation control fluid pressure mode when a vehicle starts to travel. Consequently, desired braking force can be rapidly generated. ## Claims ### Claim 1 A brake control device, comprising: a plurality of wheel cylinders in which each wheel cylinder is provided to each of a plurality of wheels respectively and receives a fluid pressure of fluid and provides a braking force to each wheel, a depression force fluid pressure circuit which transmits the fluid pressure of fluid pressurized by pedal force input into a brake pedal to a plurality of wheel cylinders, a power fluid pressure generator to pressurize fluid regardless of the operation of the brake pedal, a fluid pressure control circuit which regulates fluid pressure of fluid pressurized by the power fluid pressure generator and transmits fluid pressure to a plurality of wheel cylinders, a stroke simulator which generates an anti-power depending on an operation quantity of the brake pedal operation and permits the brake pedal operation, an electronic control device which executes a normal control mode for generating a braking force depending on the brake pedal operation quantity using the fluid pressure control circuit while operating the stroke simulator and a depression force fluid pressure mode for generating a braking force using the depression force fluid pressure circuit while stopping the stroke simulator selectively, a rapid startup means for starting the electronic control device by the brake pedal operation, further comprising a rapid startup mode switching control means for switching a braking mode from the depression force fluid pressure mode to the normal control mode in the middle of the returning operation of the brake pedal when the electronic control device starts by the rapid startup means. ### Claim 2 (depends on 1) A brake control device according to claim 1, wherein the rapid startup mode switching control means switches a braking mode from the depression force fluid pressure mode to the normal control mode when the electronic control device started by the rapid startup means, and the operation quantity of the brake pedal decreases than a predetermined switching determination threshold value. ### Claim 3 (depends on 1) A brake control device according to claim 1, further comprising: a simulator non-operation control fluid pressure mode executing means to execute a simulator non-operation control fluid pressure mode for generating a braking force using the fluid pressure control circuit in the state of stopping the function of the stroke simulator when a predetermined control fluid pressure requirement condition is satisfied even if the returning operation of the brake pedal is not carried out after starting the electronic control device by the rapid startup means. ### Claim 4 (depends on 3) A brake control device according to claim 3, wherein the control fluid pressure requirement condition is a condition in which vehicle speed is beyond a predetermined setting speed. ### Claim 5 (depends on 1) A brake control device according to claim 1, further comprising: a target breaking force calculation means which calculates a correction quantity for correcting of relations with a brake pedal operation quantity and a target breaking force after the switch to the normal control mode based on a real braking force generated by the depression force fluid pressure circuit in the case of switching the braking mode from the depression force fluid pressure mode to the normal control mode, and calculates the target breaking force based on the correction quantity. ### Claim 6 (depends on 5) A brake control device according to claim 5, wherein the target breaking force calculation means corrects the brake pedal operation quantity using the correction quantity, the brake control device further comprises a correction quantity update means for updating the correction quantity so that the corrected brake pedal operation quantity is not smaller than a predetermined lower limit value. ### Claim 7 (depends on 1) A brake control device according to claim 1, wherein the stroke simulator is connected to a simulator flow path branched from a point of the power fluid pressure generator side of the fluid pressure control circuit than a depression force cutoff valve for opening and closing the fluid pressure control circuit and introduces fluid of the quantity depending on the brake pedal operation quantity and generates the anti-power on condition that a simulator opening and closing valve provided in the simulator flow path is at an opened state, the brake control device further comprises a valve operation timing setting means for opening the simulator opening and closing valve on condition that a valve provided in a point of the wheel cylinder side of the fluid pressure control circuit than the branch point of the simulator flow path is at a closed state in the case of switching the braking mode from the depression force fluid pressure mode to the normal control mode.