Advics Co., Ltd.

Taro Segawa

Masahiko Kamiya

Hiroyuki Shinkai

Hidenobu Kajita

Shinichi Tsujimura

Takaaki Matsuhashi

Takayuki Shibata

Masuhiro Kondo

A stopper formed of a magnetic material and forming a portion of a magnetic circuit has a deformable portion that deforms in accordance with the pressure in a space within a sleeve. The deformable portion is provided with a pressure sensor that measures the amount of deformation of the deformable portion. The deformable portion, corresponding to a diaphragm, is formed in the stopper, which is a conventional electromagnetic valve component part. Therefore, it is no longer necessary to provide a diaphragm or a seal member.

Electromagnetic valve and fluid control apparatus

A vehicle brake device A is provided with a master cylinderfor generating a fluid pressure depending on the stepping state of a brake pedaland a differential pressure control valveconstituted by a solenoid valve of the type that has two portsand is capable of controlling the differential pressure between the both portsand. The differential pressure control valveis connected at its portto an outlet portof the master cylinder. An ECUcontrols the differential pressure control valveto generate a controlled differential pressure corresponding to the pedal operation state of the brake pedalbetween the both portsand. Thus, according to the vehicle brake device A, it can be realized to obtain a pedal feeling which is smooth without suffering any delay in response, to easily alter a reaction force property of the brake pedal for any of various vehicle models, and to decrease in cost as well as dimension.

Vehicle brake device

A vehicle brake device A is provided with a master cylinder, a reservoir tank, solenoid valvesandfor adjustably draining brake oil from outlet portsof the master cylinderto the reservoir tank, a collision detection sensorfor detecting a collision of the vehicle, a fluid pressure meterfor detecting the master cylinder pressure, and an ECU. The ECUdetects the pushing-up of the brake pedalbased on the occurrence of a collision and the master cylinder pressure, and upon detection of the pushing-up, controls the solenoid valvesandto adjust the draining of the brake oil so that the brake pedalis withdrawn. Thus, a time point when the brake pedalbegins to be pushed up by the cause of the vehicle collision can be detected accurately and reliably, and the brake pedalcan be withdrawn accurately in dependence on the pushing-up. This reliably secures an anchorage upon which the driver keeps his body balance and reliably prevents an excess load from being exerted on the driver.

A hydraulic pressure controller is provided which includes a hydraulic unit for controlling hydraulic pressure and an electronic control unit. The hydraulic unit includes a block in which are mounted electric actuators. The electronic control unit controls the electric actuators by applying electric signals thereto to control hydraulic pressure produced in the hydraulic unit to external elements in a controlled manner, thereby controlling the behavior of the vehicle. The electronic control unit includes a housing in which are mounted a circuit board and other electronic and electric parts, and a fitting portion provided on the housing so as to face one side of the block. At least one end portion of the block is received in the fitting portion and is engaged by a seal. The controller further includes a fastener for joining the block to the fitting portion.

Hydraulic pressure controller

A brake hydraulic pressure control unit is proposed. It includes housing, a pump mounted in the housing, a reservoir for hydraulic fluid, and hydraulic pressure control valves. The pump is adapted to draw hydraulic fluid in the reservoir and return the thus drawn fluid into a hydraulic circuit. The hydraulic pressure valves are adapted to selectively discharge fluid in the hydraulic circuit into the reservoir, thereby controlling brake hydraulic pressure. The control unit may further include a pulsation damper for muffling noise produced from the pump. The reservoir and the pulsation damper are both separate members from the housing and are mounted to the housing. Thus, the volume of the housing and the capacities of the reservoir and the pulsation damper can be determined independently of each other.

Brake hydraulic pressure control unit

If a pressure sensor is increased in size and therefore the inside diameter of a yoke is increased, a stopper is provided with a large-diameter portion. The large-diameter portion makes it possible to reduce the air gap between the stopper and the yoke and therefore suppress an increase in magnetic resistance. Besides, a magnetic circuit member is provided at an outer peripheral side of a sleeve. The magnetic circuit member makes it possible to reduce the air gap between the yoke and an armature and therefore suppress an increase in magnetic resistance.

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Kariya, Japan

Taro Segawa