Patent application number | Description | Published |
20090001807 | BRAKE FLUID PRESSURE CONTROL APPARATUS FOR VEHICLE - Brake fluid pressure control apparatus includes: fluid pressure passage from a fluid pressure source to a wheel brake; pressure regulating valve arranged on the passage; pump for feeding pressurized brake fluid to the passage between the valve and the wheel brake; motor for driving the pump; and controller which controls an electric current applied to the valve in accordance with target fluid pressure for the wheel brake to control fluid pressure supplied to the wheel brake. The controller includes: means for converting the target fluid pressure into fluid volume and calculating required flow rate from this fluid volume; means for calculating required rotation speed of the motor from the required flow rate and on the basis of efficiency of the pump; and means for increasing the electric current applied to the valve for a predetermined value when the required rotation speed exceeds actual rotation speed of the motor. | 01-01-2009 |
20110121641 | VEHICLE BRAKE FLUID PRESSURE CONTROL APPARATUS - A vehicle brake fluid pressure control apparatus includes: a normally open electromagnetic valve which adjusts a differential pressure between an upstream side and a downstream side; and a control unit including a memory part which stores a valve closing map which shows a relationship between the differential pressure between the upstream side and the downstream side of the pressure regulator valve and an output current value for closing the pressure regulator valve and a valve opening map which shows a relationship between the differential pressure and an output current value for opening the pressure regulator valve, wherein when attempting to reduce a fluid pressures, the control unit executes a current value switching control which controls a current flowing to the pressure regulator valve by selecting alternately an output current value of the valve opening map and an output current value of the valve closing map. | 05-26-2011 |
20110125379 | VEHICLE BRAKE FLUID PRESSURE CONTROL APPARATUS - A vehicle brake fluid pressure control apparatus includes: a control unit including a memory part for storing a valve closing map which shows a relationship between a differential pressure between an upstream side and a downstream side of a pressure regulator valve and an output current value for closing the pressure regulator valve and a valve opening map which shows a relationship between the differential pressure and an output current value for opening the pressure regulator valve, wherein the control unit executes a current value switching control in which the output current value of the valve closing map is changed to that of the valve opening map and thereafter, the output current of the valve opening map is changed to an output current value which lies somewhere between the output current values of the valve closing map and the valve opening map. | 05-26-2011 |
20140060038 | MOTOR CONTROL DEVICE AND VEHICLE BRAKE HYDRAULIC PRESSURE CONTROL APPARATUS - A motor control device (a motor driver) for controlling, by a duty control, a current supplied to a motor includes a driving controller, an off controller, and a voltage acquiring section (an A/D conversion processor, a sampling section). The driving controller performs on/off control of the current supplied to the motor with a first period. The off controller performs off control for the motor with a second period separately from the on/off control performed by the driving controller. The second period is longer than the first period. The voltage acquiring section acquires a voltage between terminals of the motor during a time period in which the off control is performed by the off controller. | 03-06-2014 |
20140100752 | VEHICLE BRAKE HYDRAULIC PRESSURE CONTROL APPARATUS - A vehicle brake hydraulic pressure control apparatus includes an acquiring section, first and second control quantity calculators, and a holding section. The acquiring section acquires engine restarting information. The first control quantity calculator calculates a first control quantity. The second control quantity calculator calculates a second control quantity larger than the first control quantity. The holding section holds a brake hydraulic pressure. If the brake hydraulic pressure lowers from a point in time when the vehicle is stopped to a point in time when the acquiring section acquires the engine restarting information, the holding section holds the brake hydraulic pressure with the first control quantity. If the acquiring section acquires the engine restarting information, the holding section holds the brake hydraulic pressure with the second control quantity. If the restarting of the engine is completed, the holding section holds the brake hydraulic pressure with the first control quantity). | 04-10-2014 |
20150183428 | VEHICLE BEHAVIOR CONTROL SYSTEM - According to one embodiment, there is provided a vehicle behavior control system. The vehicle behavior control system includes a steering angle obtaining module, a steering angular velocity obtaining module, a vehicle speed obtaining module, a standard yaw rate calculation module, a limit yaw rate setting module and a behavior stabilization control module. The behavior stabilization control module executes a behavior stabilization control so as to stabilize a behavior of the vehicle by giving a braking force to a turning outer wheel of the vehicle based on a target braking force. The behavior stabilization control module sets a control intervention threshold based on the limit yaw rate and the steering angular velocity, and determines that the behavior stabilization control is to be started in case the standard yaw rate exceeds the control intervention threshold. | 07-02-2015 |