# US 9,434,365 B2 · Vehicle brake hydraulic pressure controller > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,365 B2 - Document ID: US9434365B2 - Status: Granted - Kind: B2 - Application number: 14/300,672 - Filed: 2014-06-10 - Published: 2014-12-18 - Granted: 2016-09-06 - Earliest claimed: 2013-06-12 - Assignees: Autoliv Nissin Brake Systems Japan Co., Ltd. - Applicants: Nissin Kogyo Co., Ltd. - Inventors: Takashi Kinoshita - Web page: https://patentgrep.com/patent/US9434365B2 ## CPC - B60T 8/245: {Longitudinal vehicle inclination} - B60T 7/042: {by electrical means, e.g. using travel or force sensors} - B60T 7/122: {for locking of reverse movement} - B60T 8/4081: {Systems with stroke simulating devices for driver input (B60T8/4077 takes 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 13/745: {acting on a hydraulic system, e.g. a master cylinder} - B60W 30/18118: {Hill holding} - B60T 8/00: Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force (by changing number of effective brake cylinders in power brake systems B60T17/10) - B60T 13/588: {both fluid and mechanical assistance or drive} - B60T 13/66: Electrical control in fluid-pressure brake systems - B60T 13/686: {in hydraulic systems or parts thereof} - B60T 2201/06: Hill holder; Start aid systems on inclined road - 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 - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT ## Abstract There is provided a hydraulic pressure controller to be mounted on a vehicle which is configured so that a driving torque transmitted to wheels during a stop of the vehicle reduces. The hydraulic pressure controller includes a vehicle holding controller configured to carry out a vehicle holding control to hold a brake hydraulic pressure applied to the wheels during the stop of vehicle stop. In the case that an actual-pressure-equivalent hydraulic pressure corresponding to a brake hydraulic pressure actually applied to the wheels is not more than a predetermined hydraulic pressure at a start time of the vehicle holding control, the vehicle holding controller sets a pressurization target pressure using a specific driving torque applied at the start time of the vehicle holding control and carries out a pressurization control to raise the brake hydraulic pressure to the pressurization target pressure. ## Claims ### Claim 1 A vehicle brake hydraulic pressure controller to be mounted on a vehicle which is configured so that a driving torque transmitted to wheels during a stop of the vehicle reduces, the vehicle brake hydraulic pressure controller comprising: a vehicle holding controller configured to carry out a vehicle holding control to hold a brake hydraulic pressure applied to the wheels during the stop of vehicle, wherein, in the case that an actual-pressure-equivalent hydraulic pressure corresponding to a brake hydraulic pressure actually applied to the wheels is not more than a predetermined hydraulic pressure at a start time of the vehicle holding control, the vehicle holding controller sets a pressurization target pressure using a specific driving torque applied at the start time of the vehicle holding control and carries out a pressurization control to raise the brake hydraulic pressure to the pressurization target pressure. ### Claim 2 (depends on 1) The vehicle brake hydraulic pressure controller of claim 1, further comprising: a road surface gradient estimator configured to estimate a road surface gradient, wherein the vehicle holding controller corrects the pressurization target pressure on the basis of the road surface gradient estimated by the road surface gradient estimator. ### Claim 3 (depends on 2) The vehicle brake hydraulic pressure controller of claim 2, wherein the road surface gradient estimator estimates the road surface gradient on the basis of a longitudinal acceleration, and the vehicle holding controller corrects the pressurization target pressure under the condition that the longitudinal acceleration has been stabilized. ### Claim 4 (depends on 3) The vehicle brake hydraulic pressure controller of claim 3, wherein the vehicle holding controller calculates a vehicle stop optimum holding pressure at which the vehicle stops in a state of zero driving torque on the basis of the road surface gradient estimated by the road surface gradient estimator while the pressurization control is carried out and sets the pressurization target pressure to the actual-pressure-equivalent hydraulic pressure in the case that the actual-pressure-equivalent hydraulic pressure is larger than the vehicle stop optimum holding pressure. ### Claim 5 (depends on 1) The vehicle brake hydraulic pressure controller of claim 1, further comprising: a setting storage configured to store a minimum pressurization target pressure, wherein the vehicle holding controller sets the pressurization target pressure to the minimum pressurization target pressure in the case that the pressurization target pressure is smaller than the minimum pressurization target pressure. ### Claim 6 (depends on 1) The vehicle brake hydraulic pressure controller of claim 1, wherein the vehicle holding controller raises the brake hydraulic pressure at a preset constant incremental gradient in the pressurization control. ### Claim 7 (depends on 1) The vehicle brake hydraulic pressure controller of claim 1, wherein the vehicle holding controller sets a pressurization target pressure using the specific driving torque only at the start time of the vehicle holding control and carries out a pressurization control to raise the brake hydraulic pressure to the pressurization target pressure. ### Claim 8 (depends on 7) The vehicle brake hydraulic pressure controller of claim 7, wherein after the start time of the vehicle holding control, the vehicle holding controller sets the pressurization target pressure without using the driving torque T. ### Claim 9 (depends on 1) The vehicle brake hydraulic pressure controller of claim 1, wherein the vehicle holding controller judges whether the actual-pressure-equivalent hydraulic pressure is not more than the predetermined hydraulic pressure, and the vehicle holding controller carries out pressurization control by driving an electric motor forward in the case that the actual-pressure-equivalent hydraulic pressure is not more than the predetermined hydraulic pressure and maintains a rotation stop state of the electric motor in the case that the actual-pressure-equivalent hydraulic pressure is more than the predetermined hydraulic pressure. ### Claim 10 (depends on 1) The vehicle brake hydraulic pressure controller of claim 1, wherein the actual-pressure-equivalent hydraulic pressure is a target value of the brake hydraulic pressure of one subsequent control cycle and the brake hydraulic pressure applied to the wheels during the vehicle holding control is nearly equal to the actual-pressure-equivalent hydraulic pressure. ### Claim 11 (depends on 10) The vehicle brake hydraulic pressure controller of claim 10, wherein at the start time of the vehicle holding control, the actual-pressure-equivalent hydraulic pressure is set to a same value as a start time value of the brake hydraulic pressure. ### Claim 12 (depends on 11) The vehicle brake hydraulic pressure controller of claim 11, wherein in a case that the vehicle holding control is carried out thereafter, a same value is maintained without being changed. ### Claim 13 (depends on 12) The vehicle brake hydraulic pressure controller of claim 12, wherein in the case that the pressurization control is carried out at the start time of the vehicle holding control, the actual-pressure-equivalent hydraulic pressure is set as a latest target value to which the brake hydraulic pressure is raised from a present brake hydraulic pressure to the pressurization target pressure at a constant upward gradient. ### Claim 14 (depends on 13) The vehicle brake hydraulic pressure controller of claim 13, wherein, the actual-pressure-equivalent hydraulic pressure is set to a total value of the present brake hydraulic pressure and a hydraulic pressure incremental amount per unit time corresponding to an upward gradient. ### Claim 15 (depends on 11) The vehicle brake hydraulic pressure controller of claim 11, wherein the vehicle holding controller is configured so as to correct the pressurization target pressure on a basis of road surface gradient. ### Claim 16 (depends on 15) The vehicle brake hydraulic pressure controller of claim 15, wherein the vehicle holding controller calculates an optimum holding pressure on the basis of the road surface gradient calculated in a state in which the pressurization control is carried out. ### Claim 17 (depends on 16) The vehicle brake hydraulic pressure controller of claim 16, wherein the vehicle holding controller judges whether the control request hydraulic pressure is larger than a vehicle stop optimum holding pressure, in a case that the control request hydraulic pressure is larger, the vehicle holding controller sets the pressurization target pressure to the actual-pressure-equivalent hydraulic pressure, and in the case that the actual-pressure-equivalent hydraulic pressure is larger than the vehicle stop optimum holding pressure, the vehicle holding controller sets the pressurization target pressure to the actual-pressure-equivalent hydraulic pressure, whereby the pressurization control is ended promptly. ### Claim 18 (depends on 16) The vehicle brake hydraulic pressure controller of claim 16, wherein in a case that the pressurization target pressure is smaller than the minimum pressurization target pressure, the vehicle holding controller sets the pressurization target pressure to a minimum pressurization target pressure. ### Claim 19 (depends on 11) The vehicle brake hydraulic pressure controller of claim 11, wherein the vehicle holding controller is configured so as to correct the pressurization target pressure under a condition that a longitudinal acceleration output from a longitudinal acceleration sensor has been stabilized. ### Claim 20 (depends on 19) The vehicle brake hydraulic pressure controller of claim 19, wherein the judgment as to whether the longitudinal acceleration has been stabilized is made by judging whether a condition that a change amount of the longitudinal acceleration per unit time output from the longitudinal acceleration sensor has been not more than a predetermined value is satisfied continuously for a predetermined time.