Patent application number | Description | Published |
20080203812 | Brake Control Apparatus for Vehicle - A brake control apparatus for a vehicle includes a first calculating portion for calculating a master cylinder pressure, a first determining portion for determining whether or not the brake operation is performed, a second calculating portion for calculating a target wheel cylinder pressure, a third calculating portion for calculating a controlled pressure, a controlling portion for controlling a pressure difference control valve, a second determining portion for determining whether or not the vehicle is stopped, and a driving portion for specifying a drive pattern of a motor to a first motor drive pattern in a case where the vehicle is not stopped, the motor driving a pump for discharging a brake fluid, the driving means specifying the drive pattern to a second motor drive pattern in a case where the vehicle is stopped, the driving means driving the motor based on the motor driving pattern specified. | 08-28-2008 |
20090024289 | Braking Control Device - Braking discomfort applied to the driver is minimized. Provided are a brake operation amount section ( | 01-22-2009 |
20090024291 | BRAKING CONTROL DEVICE - It is an object of the present invention to minimize any sensation of inadequate firmness and large changes in deceleration rate with respect to a change in a brake operation force when the force exceeds a boost limit point. A first correlation S1 when a brake operation force increases and a second correlation S2 after hysteresis is applied at the time of a decrease in the brake operation force are taken as relationships between a brake operation force F and a wheel cylinder pressure PWC in a state wherein an assist hydraulic pressure PA is not applied. An assist hydraulic pressure control section controls the assist hydraulic pressure PA so that when a brake operation force that exceeds a boost limit point T1 is applied, the assist hydraulic pressure PA is added, hysteresis is applied when the brake operation force decreases, the assist hydraulic pressure PA decreases, and the relationship between the wheel cylinder pressure PWC and the brake operation force F when the assist hydraulic pressure PA decreases to zero becomes the second correlation S2. | 01-22-2009 |
20090243382 | BRAKING CONTROL APPARATUS - A braking control apparatus includes a brake operating member, a hydraulic circuit supplying a wheel cylinder hydraulic pressure to a wheel cylinder, a pump generating a hydraulic pressure so that the wheel cylinder hydraulic pressure reaches a value in response to an operation of the brake operating member, a circulation conduit provided at a portion of the hydraulic circuit, the circulation conduit through which a partial amount of brake fluid discharged from the pump is circulated back to the pump, a pressure regulating valve adjust a pressure difference between an upstream side of the pressure regulating valve connected to the wheel cylinder and a downstream side, and a controlling device calculating, on the basis of a circulation flow rate of the brake fluid passing through the pressure regulating valve, an applied current to the pressure regulating valve for obtaining a target of the pressure difference and controlling the applied current. | 10-01-2009 |
20110062906 | DEVICE AND METHOD FOR CONTROLLING MOTOR - A motor controlling device is provided that controls a brushless motor having a plurality of phases based on magnetic pole signals output by a plurality of magnetic pole signal output sections each corresponding to one of the phases. The motor controlling device includes an abnormality determining section, a signal generating section, and a motor controlling section. The abnormality determining section determines whether a magnetic pole signal output by each magnetic pole signal output section is an abnormal magnetic pole signal. When the abnormality determining section determines that at least one of the magnetic pole signals is an abnormal magnetic pole signal, the signal generating section generates a simulated signal corresponding to the abnormal magnetic pole signal based on the normal magnetic pole signals other than the abnormal magnetic pole signal and the rotational state of the brushless motor. The motor controlling section controls the brushless motor based on the simulated signal and the normal magnetic pole signals when the signal generating section generates the simulated signal. | 03-17-2011 |
20110077832 | BRAKE CONTROL APPARATUS AND MOTOR ROTATIONAL SPEED COMPUTATION METHOD USED IN SAID BRAKE CONTROL APPARATUS - There is provided a low-cost, power-saving brake control apparatus that is capable of performing control with good pressure regulation precision. The brake control apparatus has adjusting motor rotational speed computation means for causing pressurization control means to set a pressure regulation valve in a closed state and carry out an action of driving a pump at a predetermined motor rotational speed a plurality of times at different motor rotational speeds, and for computing in advance a adjusting motor rotational speed on the basis of the ratio between each of the motor rotational speeds and each of the pressure gradients for when the pressurization force of a pump driven at each of the motor rotational speeds has reached a predetermined pressure; and requested motor rotational speed correction means for correcting the requested motor rotational speed on the basis of the adjusting motor rotational speed in a case where the pressurization control means increases the pressure of the wheel cylinders and generates braking force in the wheels. | 03-31-2011 |
20120247100 | VEHICLE BRAKE SYSTEM - A vehicle brake system comprises a master brake cylinder having an input piston and master piston and connected to a wheel brake device, a reaction force generating device for generating a reaction force pressure corresponding to a displacement amount of the input piston, a change over valve provided in an open passage branched from a hydraulic conduit connecting the reaction force generating device to the reaction force chamber defined by the input piston and the change over valve connected to a reservoir, a brake force boosting device for applying an assisting pressure to a master piston, an assisting pressure limit judging portion for judging whether the assisting pressure has reached to an assisting limit pressure, and a change over controlling portion for changing over the change over valve to an open state when the assisting pressure limit judging portion judges that the assisting pressure has reached the assisting limit pressure. | 10-04-2012 |
20130127238 | Vehicle Brake Device - A vehicle brake device includes a master cylinder having a master piston moved by servo pressure in a servo chamber and master pressure of a master chamber is changed by movement of the master piston. A mechanical servo pressure generating unit is connected to a high pressure source and the servo chamber, and generates a servo pressure within the servo chamber according to pilot pressure within a pilot chamber based on brake fluid pressure of the high pressure source. An electrical pilot pressure generating unit is connected to the pilot chamber and generates desired pilot pressure within the pilot chamber, and a master chamber-to-pilot chamber brake fluid line connects the master chamber with the pilot chamber so pilot pressure is generated by the pilot pressure generating unit during normal operation of a power supply system, and the master pressure is used as pilot pressure when the power supply system fails. | 05-23-2013 |
20130221736 | VEHICLE BRAKE DEVICE - Vehicle brake device comprises a master cylinder including a master chamber connected to a wheel cylinder, a drive pressure chamber in which a drive pressure is generated for driving a master piston and a fluid pressure chamber in which a fluid pressure is generated in response to a stroke position of the master piston and an operating characteristics setting device for setting operating characteristics of an electromagnetic valve. The operating characteristics include a relationship of the pressure differential in the fluid conduit between the master cylinder side and the wheel cylinder side with respect to the electromagnetic valve based on the supply amount of the electric power detected by the supplied electric power detecting device. | 08-29-2013 |
20130318963 | BRAKING CONTROL DEVICE FOR VEHICLE - The braking control device for a vehicle is adapted to be used for a vehicle brake device and it is an object of the present invention to prevent an operator of the vehicle from feeling of any an unpleasant feeling by reducing an ineffective operating amount by which no braking force increases in response to the increase of the brake operating amount. The braking control device includes a controlling portion for changing a servo performance to an ineffective operating amount reducing servo performance which is closer to the increase ratio of the hydraulic pressure braking force relative to the increase of the brake operating amount after the input piston has been in contact with the output piston when the brake operating amount reaches to the servo performance change operating amount which is smaller than the assisting limit operating amount. | 12-05-2013 |
20140265546 | VEHICLE BRAKE DEVICE - A vehicle brake device is provided with a regulator for generating a servo pressure acting on a master piston in a master cylinder, based on a pilot pressure. The regulator is provided with a brake fluid absorbing section communicating with a first pilot chamber for absorbing the brake fluid as the pilot pressure in the first pilot chamber in the quantity depending on the fluid pressure in the first pilot chamber. The brake fluid absorbing section comprises a piston receiving portion formed in a second piston and opening to the first pilot chamber, a pressure receiving piston slidably received in the piston receiving portion and making the first pilot chamber variable in capacity, and an urging member urging the pressure receiving piston toward the first pilot chamber side. | 09-18-2014 |