Patent application number | Description | Published |
20100131151 | STROKE SENSOR ABNORMALITY DETERMINING DEVICE AND DETERMINING METHOD, AND BRAKE CONTROL DEVICE AND METHOD - In a stroke sensor abnormality determining device, a stroke sensor detects the stroke of a brake pedal by detecting a voltage that varies in accordance with the stroke of the brake pedal. An abnormality determining section determines whether an abnormality has occurred in the stroke sensor on the basis of the voltage detected by the stroke sensor. A pedal position determining section determines whether the brake pedal is positioned near a stroke start end. If it is determined that the brake pedal is positioned near the stroke start end, the abnormality determining section does not determine that an abnormality has occurred in the stroke sensor. | 05-27-2010 |
20100198476 | BRAKE CONTROL SYSTEM AND BRAKE CONTROL METHOD - A brake control system includes a first wheel cylinder that applies braking force to a first wheel according to hydraulic pressure; a second wheel cylinder that applies braking force to a second wheel according to hydraulic pressure; a brake actuator that receives current and individually controls the hydraulic pressure of the first wheel cylinder and the hydraulic pressure of the second wheel cylinder; a power supply that supplies the current to the brake actuator; and a control portion which sets a braking force distribution between the first wheel and the second wheel based on the state-of-charge of the power supply, and controls the brake actuator according to the braking force distribution. | 08-05-2010 |
20100301667 | BRAKE CONTROL SYSTEM - In a brake control system ( | 12-02-2010 |
20110210604 | BRAKING CONTROL APPARATUS - In a braking control apparatus, a plurality of pumps are driven by a common first motor. A brake supplies operating fluid to pipelines by operating the first motor, and controls opening/closing of a fluid pressure regulating valve so as to make the wheel cylinder pressure in the right front wheel approach the right front wheel target pressure, and controls opening closing of a fluid pressure regulating valve so as to make the wheel cylinder pressure in the left rear wheel approach the left rear wheel target pressure. In the case where the right front wheel target pressure is zero when the fluid pressure regulating valve is to be opened so as to make the wheel cylinder pressure in the left rear wheel approach the left rear wheel target pressure, the brake turns off the first motor. | 09-01-2011 |
20110241417 | BRAKING APPARATUS - A braking apparatus according to an embodiment includes: a fluid pressure circuit that is provided between a master cylinder and a wheel cylinder, and that includes both a first system flow channel connecting a reservoir and at least one of the plurality of wheel cylinders, and a second system flow channel connecting at least one of the plurality of wheel cylinders and the master cylinder, and that forms a flow channel for supplying operating fluid to each of the wheel cylinders; and a pump provided in the first system flow channel and driven by the motor to increase the fluid pressure of the operating fluid to be supplied from the reservoir to the wheel cylinders. A control unit controls the driving state of the pump in order to drive, when a predetermined fail standard for braking control has been satisfied, the motor in accordance with the information detected by an operating state detection means, and executes fail-safe control for providing braking force by supplying the operating fluid discharged from the pump to the fluid pressure chamber in the master cylinder. | 10-06-2011 |
20110316326 | BRAKE SYSTEM - A brake system including: (i) hydraulic brakes provided for respective wheels of a vehicle, and configured to be activated by hydraulic pressures of respective brake cylinders so as to restrain rotations of the respective wheels; (ii) a power hydraulic pressure source including a drive source that is activatable by supply of electric energy, and configured to generate hydraulic pressure by activation of the drive source; and (iii) a common passage to which the power hydraulic pressure source and the brake cylinders of the hydraulic brakes are connected. The brake cylinders include a first brake cylinder connected to the common passage via a first individual passage that is provided with a normally-close electromagnetic valve as a first individual control valve. The brake cylinders include a second brake cylinder connected to the common passage via a second individual passage that is provided with a normally-open electromagnetic valve as a second individual control valve. | 12-29-2011 |
20120068529 | HYDRAULIC BRAKE SYSTEM FOR VEHICLE - A system including: a liquid-pressure source device that can supply working fluid to a brake device; and an ABS valve device. The system executes a first control in which a supply pressure of the working fluid becomes a target supply pressure and a second control for making the supply pressure fall within the target range. In this system, when the valve device is not being operated, the first control is executed. When the valve device is being operated, the second control is normally operated, and when the supply pressure is higher than a threshold value, the first control is executed. Where completion of the operation of the valve device is estimated, the system performs at least one of reducing the threshold value, reducing an upper limit value of the target range, increasing an electric power supplied to a pressure-reduce linear valve during the first control when the valve device is being operated, and reducing the target supply pressure. | 03-22-2012 |
Patent application number | Description | Published |
20080238186 | HYDRAULIC BRAKE SYSTEM - A hydraulic brake system for a vehicle includes a brake having a wheel cylinder that applies a braking force to a wheel, and a pressurizing device. The pressurizing device pressurizes the brake liquid and includes a suction portion for sucking a brake liquid, and additionally includes an output portion connected to the wheel cylinder. A linear solenoid valve includes at least one housing, and is connected to the wheel cylinder and to the suction portion of the pressurizing device. The solenoid valve includes a valve portion having a reciprocating valve member and a valve seat opposed to the valve member. A biasing member biases the valve member in one direction and a solenoid applies a drive force to the valve member in an opposite direction. In addition, a hydraulic-pressure-decrease restraining device restrains a decrease of pressure of the brake liquid in the housing. | 10-02-2008 |
20100295363 | BRAKE CONTROL SYSTEM AND BRAKE CONTROL METHOD - A brake control system includes a wheel cylinder, a brake pedal, a master cylinder in which communication between it and an external master cylinder reservoir is cut off when the operating amount of the brake pedal is equal to or greater than a predetermined value, an internal reservoir, and a pump which selectively discharges hydraulic fluid in two directions, one being a direction that increases the hydraulic pressure in the wheel cylinder by drawing up hydraulic fluid from the internal reservoir, and the other being a direction that stores hydraulic fluid in the internal reservoir. The pump is driven to discharge hydraulic fluid in the direction that stores hydraulic fluid when communication is open between the master cylinder and the master cylinder reservoir, and driven to discharge hydraulic fluid in the direction that increases the hydraulic pressure when communication is cut off between the master cylinder and the master cylinder reservoir. A further invention is directed to a brake control method. | 11-25-2010 |
20120136547 | BRAKE CONTROL SYSTEM, AND BRAKE CONTROL METHOD - A brake control system includes: a friction brake unit for generating a friction braking force; a regenerative brake unit for generating a regenerative braking force; and a control unit for controlling the regenerative and friction brake units based on a regenerative target value and a friction target value defined based on a target deceleration, and for controlling a braking force by selecting one of a plurality of control modes including both a regeneration permission mode in which a total braking force is generated by the regenerative and friction braking forces, and a regeneration prohibition mode in which the target deceleration is generated by the friction braking force. In the permission mode, the control unit generates the total force by providing a delay, while in the prohibition mode, the control unit provides a delay smaller than the above delay to the friction braking force or does not provide a delay. | 05-31-2012 |
20120158266 | BRAKE CONTROL DEVICE - A brake control system includes: a friction brake unit configured to generate a friction braking force; a regenerative brake unit configured to generate a regenerative braking force; and a brake control unit configured to control the regenerative brake unit and the friction brake unit based on a regenerative target value and a friction target value based on a target braking force, which is a target of the braking force to be provided to a wheel. The brake control unit controls the regenerative brake unit based on a second regenerative target value larger than a first regenerative target value that has been defined based on the target braking force. | 06-21-2012 |
20120235469 | HYDRAULIC BRAKE SYSTEM - A hydraulic brake system including: (a) a first hydraulic-pressure generating device including a manual hydraulic pressure source; (b) a second hydraulic-pressure generating device including a power hydraulic pressure source; (c) a manual-operation-associated brake line including a communicating device that is to be brought into communication with the manual hydraulic pressure source and brake cylinder or cylinders of the plurality of hydraulic brakes; (d) an output hydraulic-pressure control device and a flow restraining device disposed in parallel with each other between the manual-operation-associated brake line and the second hydraulic-pressure generating device; and (e) a power hydraulic pressure source control device for activating the power hydraulic pressure source such that the hydraulic pressure is supplied to the manual-operation-associated brake line via the flow restraining device, when the output hydraulic-pressure control device cannot control the hydraulic pressure outputted by the second hydraulic-pressure generating device. | 09-20-2012 |
20120256477 | BRAKE SYSTEM - A brake system including: (a) a manual hydraulic pressure source; (b) a power hydraulic pressure source; (c) a high pressure generator for generating high pressure, by utilizing pressure of the power hydraulic pressure source; (d) a common passage to which first and second brake cylinders and the high pressure generator are connected; (e) a high-pressure-generator cut-off valve disposed between the common passage and the high pressure generator; (f) a first manual-pressure-source passage connecting a first individual passage and the manual hydraulic pressure source; (g) a first manual-pressure-source cut-off valve provided in the first manual-pressure-source passage; (h) a first valve provided between the second brake cylinder and a connected portion of the first individual passage which is connected to the first manual-pressure-source passage; and (i) a pressure-supply control device for controlling supply of pressure to the brake cylinders, by controlling the high-pressure-generator cut-off valve, first valve and first manual-pressure-source cut-off valve. | 10-11-2012 |
20120319462 | BRAKE CONTROL SYSTEM - In a brake control system, a power supply portion supplies a voltage to a plurality of actuators. When a first actuator is supplied with a voltage equal to or higher than a first minimum operating voltage from the power supply portion, the first actuator operates to perform a first function. When a second actuator is supplied with a voltage equal to or higher than a second minimum operating voltage from the power supply portion, the second actuator performs a second function. The first minimum operating voltage and the second minimum operating voltage are set to be different from each other by a predetermined value so that the first actuator and the second actuator stop operating in a predetermined sequence with a decrease in the supplied voltage. | 12-20-2012 |
20130125638 | STROKE SENSOR ABNORMALITY DETERMINING APPARATUS - A stroke sensor abnormality determining apparatus includes a stroke sensor for detecting a stroke of a brake pedal by detecting an electric signal that varies in response to the stroke of the brake pedal, a deceleration calculating unit for calculating a total target value, which is correlated with a target deceleration of a vehicle, based on at least the stroke, and an abnormality determining unit for determining whether or not an abnormality of the stroke sensor occurs, based on the electric signal detected by the stroke sensor, the abnormality determining unit being configured so that a signal indicating the abnormality of the stroke sensor can be outputted when the abnormality is determined to have occurred in the stroke sensor. | 05-23-2013 |
20130207451 | HYDRAULIC BRAKE SYSTEM - A hydraulic brake system includes: a hydraulic pressure source provided for a vehicle, and including a hydraulic-pressure generating device and a reservoir; a plurality of hydraulic brakes provided for respective wheels of the vehicle, and configured to restrain rotations of the respective wheels; and a control valve device including at least one hydraulic-pressure control valve group disposed between the hydraulic-pressure generating device and at least one of brake cylinders of the hydraulic brakes and/or between the reservoir and the at least one of the brake cylinders. Each of the at least one hydraulic-pressure control valve group includes (a) at least one ON/OFF control valve and (b) at least one linear control valve that are disposed in parallel with each other. | 08-15-2013 |
20130241275 | HYDRAULIC BRAKE SYSTEM - A mechanical pressurization device is connected to a common passage, and brake cylinders provided respectively for front left and right and rear left and right wheels are connected to the common passage respectively via pressure holding valves. Each of the pressure holding valves in the front is a normally open valve, and each of the pressure holding valves in the rear is a normally closed valve. In the event of an abnormality in which a hydraulic pressure in the common passage cannot be controlled using a hydraulic pressure produced by a power hydraulic pressure source, a hydraulic pressure in the mechanical pressurization device is supplied to the front brake cylinders provided respectively for the front left and right wheels. | 09-19-2013 |
20130249274 | HYDRAULIC BRAKE SYSTEM - Two pressure chambers of the master cylinder and brake cylinders provided respectively for front left and right wheels are respectively connected directly to each other by master passages. Provided respectively in the master passages are master cut-off valves each as a normally-closed electromagnetic open/close valve. As a result, when the brake pedal is not operated and when no current is supplied to solenoids of the respective master cut-off valves, the pressure chambers and the brake cylinders are respectively disconnected to each other, preventing an outflow of the working fluid from the pressure chambers, i.e., fluid chambers of a master reservoir to the brake cylinders. | 09-26-2013 |
20140131150 | BRAKE SYSTEM AND ACTUATOR CONTROL DEVICE - A brake system includes: (a) a first brake device including a first actuator and a first brake that utilizes an output of the first actuator; (b) a second brake device including a second actuator and a second brake that utilizes an output of the second actuator; (c) a regenerative-electric-energy obtaining device configured to obtain a regenerative electric energy that is returned to a power source device; and (d) an actuator control device configured to reduce a total consumed electric energy, by controlling the first actuator and/or the second actuator in a manner that maintains a state in which a required braking force is satisfied by a braking force of the first brake and/or a braking force of the second brake, such that the total consumed electric energy is made smaller when a regenerative electric energy is small, than when the regenerative electric energy is large. | 05-15-2014 |
20150102658 | HYDRAULIC BRAKE SYSTEM - A hydraulic brake system includes: a hydraulic pressure source provided for a vehicle, and including a hydraulic-pressure generating device and a reservoir; a plurality of hydraulic brakes provided for respective wheels of the vehicle, and configured to restrain rotations of the respective wheels; and a control valve device including at least one hydraulic-pressure control valve group disposed between the hydraulic-pressure generating device and at least one of brake cylinders of the hydraulic brakes and/or between the reservoir and the at least one of the brake cylinders. Each of the at least one hydraulic-pressure control valve group includes (a) at least one ON/OFF control valve and (b) at least one linear control valve that are disposed in parallel with each other. | 04-16-2015 |
20150108829 | BRAKING DEVICE FOR VEHICLE - A master cylinder generates a master cylinder pressure in response to a stepping operation by a driver on a brake pedal. A power hydraulic pressure generation device includes a pressurizing pump and an accumulator, and a hydraulic pressure of a working fluid pressurized by the pressurizing pump is accumulated by the accumulator as an accumulator pressure. A pressure increasing mechanism communicates to the master cylinder and the accumulator, mechanically moves in response to the master cylinder pressure supplied from the master cylinder, and uses the accumulator pressure supplied from the accumulator to generate a servo pressure. A pressure increasing mechanism cut valve serving as a shut-off valve is a normally-closed electromagnetic on-off valve, and is provided on a high pressure supply passage for communication between the accumulator and the pressure increasing mechanism. The pressure increasing mechanism cut valve is controlled by a brake ECU to be in a closed state for shutting off the communication between the accumulator and the pressure increasing mechanism. | 04-23-2015 |
20150158476 | VEHICLE BRAKE APPARATUS - A brake device for a vehicle comprises a master cylinder; a power hydraulic pressure source; a valve mechanism comprising a plurality of electromagnetic valves; a wheel cylinder for applying a braking force to a wheel; control means for controlling an operation of the valve mechanism; and upstream side hydraulic pressure adjustment means comprising an electromagnetic valve to be controlled by an electric signal in order to decrease a hydraulic pressure on an upstream side. The control means is configured to control the plurality of electromagnetic valves during an abnormal state in which there is a possibility of a leak of a working fluid in a brake system and to maintain the upstream side hydraulic pressure adjustment means in an operation preparation state so as to suppress a change in hydraulic pressure on the upstream side. | 06-11-2015 |
20150203083 | VEHICLE BRAKE APPARATUS - A holding valve ( | 07-23-2015 |
20150203086 | BRAKE DEVICE FOR VEHICLE - A master cylinder generates master cylinder pressures in response to a brake operation by a driver on a brake pedal. A power hydraulic pressure generation device includes a pressure pump and an accumulator, and the accumulator accumulates an accumulator pressure increased by the pressure pump. A hydraulic pressure control valve device includes holding valves, pressure decreasing valves, and master cut valves for carrying out transmission of the master cylinder pressures from the master cylinder or the accumulator pressure from the accumulator. A stroke simulator is connected to a master pressure pipe via a simulator cut valve. The normally-open master cut valves and the normally-closed simulator cut valve for carrying out transmission of the master cylinder pressures mechanically generated by the master cylinder are backed up with backup electric power so that the operations continue even in the event of a change in state of electric power supply. | 07-23-2015 |
20150274143 | VEHICLE BRAKE CONTROL DEVICE - A brake control device includes a front-wheel left-right communication passage that allows communication between wheel cylinders for a front-left wheel and a front-right wheel via a front-wheel communication on-off valve; a rear-wheel left-right communication passage that allows communication between wheel cylinders for a rear-left wheel and a rear-right wheel via a rear-wheel communication on-off valve; and a front-rear communication passage that allows communication between a wheel cylinder of either one of the front-left and front-right wheels and a wheel cylinder of either one of the rear-left and rear-right wheels via a front-rear communication on-off valve, wherein the brake control device keeps the front-wheel communication on-off valve, the rear-wheel communication on-off valve, and the front-rear communication on-off valve opened to set a mode to a four-wheel communication mode during a normal brake control. With this, some of linear control valves are deactivated, whereby an operating noise can be reduced. | 10-01-2015 |