Tohma
Tohma Yamaguchi, Minami-Alps-Shi JP
Patent application number | Description | Published |
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20120102940 | BRAKE APPARATUS - A brake apparatus capable of preventing generation of an unintended brake force. The brake apparatus includes an input member configured to be moved forward and backward by an operation of a brake pedal, a stroke detector for detecting an operation stroke of the input member, and a controller for controlling an actuator based on a detection result of the stroke detector. When the controller is set into the controllable state, the controller sets a stored initial base position as a control base position of the stroke detector to control the actuator based on the detection value of the stroke detector, and each time the input member is moved backward beyond the control base position, the controller updates the control base position of the stroke detector to a position of the input member at that time. | 05-03-2012 |
20120102941 | ELECTRIC BOOSTER - An electric motor is controlled based on an operation of a brake pedal to move a primary piston forward through a ball screw mechanism, thereby generating a hydraulic pressure in a master cylinder. At this time, a reaction force from the hydraulic pressure in the master cylinder is fed back to the brake pedal through an input piston. Automatic brake control, which generates the hydraulic pressure by driving the electric motor regardless of whether there is the operation of the brake pedal, is carried out. During the automatic brake control, an actual relative position is compared with a determination threshold value set based on the relative position between the primary piston and the input piston which is generated by a movement of the primary piston, and it is determined that the brake pedal is operated in a case where the relative position is smaller than the determination threshold value. | 05-03-2012 |
Tohma Yamaguchi, Hitachinaka JP
Patent application number | Description | Published |
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20140239861 | Inverter Apparatus - An objective of the present invention is to improve current detection accuracy and to reduce noise of carrier frequency. A motor apparatus and a motor drive apparatus calculate motor currents Iu, Iv, and Iw using a DC bus current detected value Idc of an inverter and control a magnitude and a phase of an applied voltage of a motor to drive the motor. A carrier adjuster decreases a carrier frequency Fc of the inverter if a motor output is relatively larger and that increases the carrier frequency Fc of the inverter if the motor output is relatively smaller. A pulse shift adjuster shifts an interphase waveform of a PWM pulse according to the carrier frequency Fc. | 08-28-2014 |
20150303844 | INVERTER DEVICE - An inverter device includes a source current calculator and an inverter circuit, wherein: the source current calculator calculates an average value of the DC bus current Ical during a PWM cycle through arithmetic operation executed based upon instantaneous values of the DC bus current Idc of the inverter circuit; and the source current calculator provides an estimated value by designating the average current value Ical during the PWM cycle as an input source current Isrc during the PWM cycle. | 10-22-2015 |
20160028342 | ELECTRIC MOTOR DRIVE DEVICE - An electric motor drive device which drives an electric motor includes switching elements which are respectively connected to output lines and correspond to upper and lower arms of respective phases, a control unit which controls the operations of the switching elements, a smoothing capacitor connected in parallel with series circuits of the upper and lower arms of the phases, and an abnormality detection unit. The abnormality detection unit detects a voltage value of a virtual neutral point as a value related to the state of insulation of each of the output lines and detects a ground fault of the output line, based on a tilt of a temporary change in the detected value. | 01-28-2016 |
Tohma Yamaguchi, Kawasaki-Shi, Kanagawa JP
Patent application number | Description | Published |
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20160046274 | BRAKE APPARATUS AND METHOD FOR DETECTING AIRIN PIPELINES OF THE BRAKE APPRATUS | 02-18-2016 |