Nissin Kogyo Co., Ltd.

Hioki Denki Kabushiki Kaisha

Hioki E.e. Corporation

Masashi Kobayashi

Tomoaki Sekiya

Tomonori Hirose

Motoyasu Nakamura

Tsutomu Amano

Kazuhiro Ohta

Shuichi Shimizu

Manabu Hiroya

Ryouji Yamazaki

Tetsuhiro Narita

Takahiro Ogawara

The probe apparatus has a probe (first metal plate) as a signal terminal and a probe (second metal plate) as a ground terminal. A probe holder has a holder main body formed of a conductor, clamps that are formed of a dielectric and capable of clamping the probes, and a fixing member and a male screw (or 'fixture') capable of fixing both clamps, which have clamped the probes, to the holder main body. The probes are clamped by the two clamps in a state where the probes have been aligned along the plate surface direction, parts at front-end portion sides of the probes protrude from the two clamps, and the parts at front-end portion sides are capable of elastic deformation along the plate thickness direction.

Probe apparatus

A probe unit includes a probe pin and a support unit supporting the probe pin. The support unit includes first and second arms disposed at a distance along a direction in which the probe pin probes a probed object; a holding unit holding base ends of the arms; and a linking unit attached to the probe pin and linking front ends of the arms. The support unit constructs a four-bar linkage that permits linear or approximately linear movement of the probe pin in an opposite direction to the probing direction. The first and second arms have through-holes at positions slightly closer to the front ends than the base ends and positions slightly closer to the base ends than the front ends, center parts between the through-holes function as bars in the four-bar linkage, and formation positions of the through-holes function as joints in the four-bar linkage.

Prober having linkage portion, method for manufacturing the prober and method of testing circuit boards using the prober

A vehicle brake hydraulic pressure control apparatus includes a hydraulic pressure adjusting unit, a split road determining section, a differential pressure control section, and a hydraulic pressure adjusting and driving section. The hydraulic pressure adjusting unit individually adjusts brake fluid pressures acting on wheel brakes for wheels. The split road determining section determines whether road surfaces which the wheels are in contact with constitute a split road. In a state where the split road determining section determines during execution of antilock braking control that the road surfaces constitute the split road, the differential pressure control section determines command pressures for the wheel brakes so that differential pressures between the brake fluid pressures of the right and left wheel brakes are equal to or less than a permissible differential pressure. The hydraulic pressure adjusting and driving section controls the hydraulic pressure adjusting unit based on the determined command pressures.

Vehicle brake hydraulic pressure control apparatus

A vehicle brake fluid pressure control apparatus includes: a controller configured to control fluid pressures in wheel brakes to increase or reduce by controlling normally open electromagnetic valves and normally closed electromagnetic valves, wherein the controller perform: a pressure reducing in a pressure reducing cycle in which a basic pressure reducing control and a gradual pressure control are performed continuously in a case that the controller determines to execute a pressure reducing control with wheel speeds decreasing; a pressure reducing control in a basic pressure reducing amount in the basic pressure reducing control; and a temporary holding control for holding the fluid pressure and a fine pressure reducing control for executing a pressure reducing in an amount smaller than the basic pressure reducing amount in a case that the wheel speeds tend to decrease after the temporary holding control in the gradual pressure reducing control.

Vehicle brake fluid pressure control apparatus

A control unitincludes an initial current value calculation unitfor calculating an initial current value when a caliper pressure shifts to a pressure increasing state, a target current value setting unitwhich, when no pressure increasing cycle was performed last time, estimates a road surface friction coefficient, determines a target differential pressure based on the road surface friction coefficient so estimated, and sets a current value corresponding to this target differential pressure as a target current value, and a valve opening amount adjusting unitwhich reduces an energization amount from the initial current value towards the target current value with a predetermined gradient.

A wheel speed calculation method wherein, when both rising and falling edges occur, the wheel speed is calculated using both the edges, when either of the edges does not occur, the wheel speed is calculated using both the edges in such a manner that for the edge not occurring, the preceding calculation value or the calculation value provided by assuming that one occurred within the temporary time, whichever is the lower, is selected. Further, neither of the rising and falling edges occurs, the minimum value of the two calculation values provided by assuming that only one edge occurred within the temporary time and the calculation value provided by assuming that only one rising edge and only one falling edge occurred within the temporary time or the calculation value of the preceding wheel speed, whichever is the lower, is selected as the wheel speed.

Wheel speed calculation method

The control unit keeps the energization duty factor to the electric motor at 100% until a predetermined time elapses and thereafter executes control of the energization duty factor in accordance with the voltage of the battery.

Brake hydraulic pressure controller for a vehicle

A rotational speed of an electric motor is memorized at a memory unit as a set rotational speed for allowing a minimum required volume of brake fluid to be discharged from the pumps in a state where the output hydraulic pressure of the master cylinder is highest, and an energizing duty ratio for the electric motor which is designed so as to rotate the electric motor at the set rotational speed is determined at a duty ratio determining unit in response to an applied voltage detected at a voltage detecting unit A motor control unit controls the energizing of the electric motor from a battery in accordance with the energizing duty ratio determined at the duty ratio determining unit

Vehicle anti-lock brake control system

A brake hydraulic control device for use in a vehicle, includes: a master cylinder with a first reservoir attached thereto; a second reservoir different from the first reservoir; a drive wheel control valve unit switching communication and cut-off between a drive wheel brake and the master cylinder as well as communication and cut-off between the drive wheel brake and the second reservoir; a driven wheel control valve unit switching communication and cut-off between a driven wheel brake and the master cylinder as well as communication and cut-off between the driven wheel brake and the second reservoir; and a pump having a discharge port connected between the drive wheel control valve unit and the drive wheel brake, and a suction port connected to the master cylinder through an open/close switch valve and to the said second reservoir.

Brake hydraulic control device for use in vehicle

In a brake hydraulic controller for controlling a hydraulic pressure from a master cylinder operative to a wheel brake, the controller includes a base, a normally open electromagnetic valve for connecting the master cylinder and the wheel brake, a reservoir, a normally closed electromagnetic valve for connecting the wheel brake and the reservoir, a return pump for returning hydraulic fluid received from the reservoir to the master cylinder, a damper, and a cover for covering the normally open and closed electromagnetic valves, the reservoir, and the damper with a surface of the cover. The cover includes a seal groove and a sealing member fitted to the seal groove for elastically contacting the surface. The brake hydraulic controller can minimize the number of parts required for waterproofing and reduce the number of manhours required for assembling.

Growing community of inventors

Nagano, Japan

Masashi Kobayashi