Patents by Inventor Masamoto Ando

Masamoto Ando has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6105611
    Abstract: A reservoir tank includes a main portion and a storage chamber disposed in the main portion for storing operating fluid, with the storage chamber being surrounded by a side wall, a ceiling portion and a bottom portion. A float is disposed in the storage chamber and is adapted to move vertically corresponding to the height of the operating fluid level, and a reed switch is operatively associated with the float so as to operate in accordance with the height of the float. A partition member divides the storage chamber into an upper space and a lower space in which the operating fluid and the float are disposed.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: August 22, 2000
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Masamoto Ando, Takashi Nagashima, Mitsuharu Hayashi, Hirohisa Kuwana
  • Patent number: 5951115
    Abstract: The present invention is directed to a brake control system for an electrically operated vehicle which is adapted to add a hydraulic braking operation to a regenerative braking operation, or change the former for the latter, rapidly and smoothly. An electric motor is operatively connected to a wheel for rotating the wheel, and a motor control unit for controlling the electric motor to apply a rotating force and a regenerative braking force to the wheel. In a main passage for connecting a master cylinder with a wheel brake cylinder, a pressure limit changeover device is disposed.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: September 14, 1999
    Assignees: Aisin Seiki Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha
    Inventors: Toshiyuki Sakai, Masamoto Ando, Naoyasu Enomoto, Shingo Urababa, Harumi Ohori
  • Patent number: 5882093
    Abstract: The present invention is directed to a brake control system for controlling a braking force applied to a wheel of an electrically operated vehicle. A changeover device is disposed in a main passage for selectively placing one of a first operating position where a static hydraulic pressure supplied from a master cylinder to a wheel brake cylinder is controlled to be lower than a master cylinder pressure generated from the master cylinder when an electric motor applies the regenerative braking force to the wheel, and a second operating position where the static hydraulic pressure is controlled to be substantially equal to the master cylinder pressure when the electric motor does not apply the regenerative braking force to the wheel.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: March 16, 1999
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Naoyasu Enomoto, Masamoto Ando, Toshiyuki Sakai
  • Patent number: 5568962
    Abstract: A braking system for an electromobile includes a relief valve VR2 for restricting a braking pressure to front wheel cylinders WC3, WC4, a bypass valve V5 connected in parallel to the relief valve VR2, a solenoid valve V1 interposed between the relief valve VR2 and booster HB and a solenoid valve V4 interposed between a pressure line 13 from the booster HB to the front wheel cylinders WC3, WC4 and a pressure line 12 from the booster HB to rear wheel cylinders WC1, WC2. During a regenerative braking by the use of an electric motor for driving front wheels WFL, WFR, a braking pressure is applied through the solenoid valve V1 and the relief valve VR2 to the wheel cylinders WC3, WC4. When the regenerative braking is interrupted, the solenoid valve V1 is closed and the bypass valve V5 and the solenoid valve V4 are opened.
    Type: Grant
    Filed: June 13, 1995
    Date of Patent: October 29, 1996
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Naoyasu Enomoto, Masamoto Ando
  • Patent number: 5511866
    Abstract: The invention is directed to an anti-skid control system for an electrically operated vehicle having an electric motor and a regenerative braking system. The system sets a desired decreasing wheel speed, when a skid detector detects a skidding condition of the wheel in response to the output signal of a wheel speed detector. A controller controls a regenerative braking torque of the electric motor in accordance with a control mode selected from a torque control mode, in which the regenerative braking torque is provided in proportion to operation of a brake operating member, and a rotation control mode, in which the regenerative braking torque is controlled to rotate the electric motor at a predetermined speed corresponding to the desired decreasing wheel speed. The controller changes the torque control mode to the rotation control mode when the skid detector detects the skidding condition.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: April 30, 1996
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Michitaka Terada, Masamoto Ando, Toshiyuki Sakai
  • Patent number: 4936637
    Abstract: An anti-skid apparatus for installation in a vehicle braking system having a master cylinder, a wheel brake cylinder and a primary fluid passage connecting these cylinders includes a changeover valve disposed in the primary fluid passage to selectively communicate the wheel brake cylinder with the master cylinder or with a reservoir, and a fluid pump for pumping a brake fluid from the reservoir and returning it to a portion of the primary fluid passage between the master cylinder and the changeover valve. The anti-skid apparatus further includes a control valve disposed in that portion of the primary fluid passage. The control valve comprises a piston slidably disposed in a housing, and a valve member slidably disposed in the piston and seatable on a valve seat with a cutout formed thereon. The control valve allows a flow of the brake fluid from the master cylinder and/or the fluid pump to the wheel brake cylinder through the changeover valve without restriction in normal braking operation.
    Type: Grant
    Filed: March 24, 1989
    Date of Patent: June 26, 1990
    Assignees: Aisin Seiki Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha
    Inventors: Yoshiharu Adachi, Masamoto Ando, Hirochika Shibata, Toshiya Shibata, Hiroaki Takeuchi, Masashi Sawada, Hiroshi Toda, Nobuyasu Nakanishi, Noboru Noguchi
  • Patent number: 4895416
    Abstract: The hydraulic brake system for a motor vehicle provides a brake fluid level detector which provides a signal to a control apparatus whereby the motor driven pump for providing braking pressure will be deactivated when the brake fluid level falls below a predetermined value. The system is also provided with pressure detector which detects the output fluid pressure and provides a signal to a control apparatus for stopping the anti-locking control apparatus of the brake system if the pressure falls below a predetermined value.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: January 23, 1990
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Kenji Tozu, Masamoto Ando, Tsuyoshi Yoshida, Kazutaka Kuwana, Michiharu Nishii, Genji Mizuno
  • Patent number: 4874207
    Abstract: A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder, a regulator and a plurality of wheel brake cylinders for braking respective road wheels, which are divided into a first group of wheel brake cylinders communicated with the master cylinder and a second group of wheel brake cylinders communicated with the regulator. The regulator has a housing defining therein a regulator chamber for introducing the hydraulic power pressure thereinto from the power source and regulating the hydraulic power pressure into a regulated hydraulic pressure in response to the hydraulic braking pressure generated in the master cylinder, and which is positioned in substantially coaxial relationship with the master cylinder and responsive mechanically to depression of a brake pedal.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: October 17, 1989
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Michiharu Nishii, Masamoto Ando, Yoshihiko Tada
  • Patent number: 4838621
    Abstract: An anti-skid apparatus for installation in a vehicle braking system having a regulator valve for producing a hydraulic power pressure in accordance with a hydraulic braking pressure from a master cylinder. A control cylinder is disposed in a hydraulic circuit connecting the master cylinder to a wheel brake cylinder, and comprises a cylinder body having a cylinder bore defined therein and a piston axially slidably disposed within the cylinder bore. This piston forms at its one end a pressure chamber communicating with the wheel brake cylinder, and is applied at its the other end with the hydraulic power pressure from the regulator. Disposed in the control cylinder is a normally open cut-off valve which normally permits the flow of the hydraulic braking pressure from the master cylinder into the pressure chamber and blocks the flow of the hydraulic braking pressure when the piston moves to an extent more than a predetermined distance from its initial position for decreasing the volume of the pressure chamber.
    Type: Grant
    Filed: February 25, 1988
    Date of Patent: June 13, 1989
    Assignees: Aisin Seiki Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha
    Inventors: Youichi Furuta, Masamoto Ando, Hiroaki Takeuchi, Noboru Noguchi, Nobuyasu Nakanishi
  • Patent number: 4730879
    Abstract: An anti-skid apparatus in a vehicle braking system including a bypass circuit connected in parallel with a braking circuit between a master cylinder and a wheel brake cylinder, wherein a fluid pump is disposed within the bypass circuit and connected to a fluid reservoir to produce a hydraulic power pressure, a first switchover valve is disposed within both the circuits to permit the flow of fluid passing through the braking circuit in its deactivated condition and to interrupt the braking circuit and connect the brake cylinder to the reservoir through the bypass circuit in its activated condition, a second switchover valve is disposed between the master cylinder and the first switchover valve to permit the flow of fluid passing through the braking circuit while the first switchover valve is maintained in its deactivated conidition and to interrupt the braking circuit and connect the pump to the brake cylinder in response to a decrease of the brake cylinder pressure caused by activation of the first switchover
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: March 15, 1988
    Assignees: Aisin Seiki Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha
    Inventors: Yoshiharu Adachi, Masamoto Ando, Hiroaki Takeuchi, Noboru Noguchi, Nobuyasu Nakanishi
  • Patent number: 4660899
    Abstract: A hydraulic anti-skid apparatus for automotive vehicles includes a cut-off valve disposed within a braking circuit connecting a master cylinder to a wheel brake cylinder, a bypass valve disposed within a bypass passage of the braking circuit, first and second pistons respectively arranged to control opening and closing operations of the cut-off valve and the bypass valve, the first and second pistons each being arranged to be applied at one end thereof with a hydraulic braking pressure from the master cylinder and at the other end thereof with a hydraulic power pressure from a fluid pump, a solenoid valve arranged to apply the power pressure to the first piston in its deactivated condition and to connect the first piston to a fluid reservoir in its activated condition, a regulator valve arranged to control the power pressure applied to the first and second pistons in accordance with the braking pressure applied thereto, the regulator valve including a booster piston assembly having a small diameter portion ap
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: April 28, 1987
    Assignees: Aisin Seiki Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha
    Inventors: Masamoto Ando, Hiroaki Takeuchi, Toyohisa Yamada, Toshihiko Yamanaka
  • Patent number: 4655509
    Abstract: A hydraulic anti-skid apparatus which includes a cut-off valve disposed within a braking circuit connecting a master cylinder to a wheel brake cylinder, a bypass valve disposed within a bypass passage of the braking circuit, first and second pistons respectively arranged to control opening and closing operations of the cut-off valve and the bypass valve, the first and second pistons each being arranged to be applied at one end thereof with a hydraulic braking pressure from the master cylinder and at the other end thereof with a hydraulic power pressure from a fluid pump, a solenoid valve arranged to apply the power pressure to the first piston in its deactivated condition and to connect the first piston to a fluid reservoir in its activated condition, and a regulator valve arranged to control the power pressure applied to the first and second pistons in accordance with the braking pressure applied thereto.
    Type: Grant
    Filed: June 11, 1986
    Date of Patent: April 7, 1987
    Assignees: Aisin Seiki Kabushiki Kaisha, Yoyota Jidosha Kabushiki Kaisha
    Inventors: Masamoto Ando, Hiroaki Takeuchi, Toyohisa Yamada, Toshihiko Yamanaka, Nobuyasu Nakanishi, Noboru Noguchi
  • Patent number: 4623200
    Abstract: A hydraulic pressure control valve for use with two independent rear braking systems, for transmitting braking hydraulic pressure to wheel cylinders in two rear wheels of a vehicle through two independent pipings. The control valve has a pair of valves, a pair of parallel pistons disposed in a single housing, and an actuating mechanism for displacing the pistons according to vehicle load. The actuating mechanism consists of a lever capable of rocking in a plane, a spring member for applying a force corresponding to the vehicle load to the rocking end of the lever, a support pin having both ends fitted in two grooves that extend parallel to the axes of the pistons and are equidistant from these axes, an equalizer which comes into abutment with one end of each piston at its either end. The equalizer is supported on the pin such that it can rock about its recessed center.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: November 18, 1986
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Masamoto Ando, Kiyonobu Nagamori
  • Patent number: 4605263
    Abstract: An antiskid control apparatus for an automobile has a motor controlled by a computer for actuating a pump to produce a working fluid pressure in an antiskid control mode. In the antiskid control mode, fluid actuators coupled between a brake master cylinder and wheel cylinders of automobile wheels are controlled by the working fluid pressure to increase and reduce the fluid pressure applied to the wheel cylinders in a cyclic manner until the wheels are no longer subject to a skid.
    Type: Grant
    Filed: July 1, 1985
    Date of Patent: August 12, 1986
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Masamoto Ando, Hiroaki Takeuchi, Toyohisa Yamada, Toshihiko Yamanaka
  • Patent number: 4561699
    Abstract: In a brake pressure control device having an inlet port for connection to a master cylinder and an outlet port for connection to a wheel brake cylinder, a differential piston cooperates with a first annular valve seat arranged in a first passage between the inlet and outlet ports, and an inertia-controlled valve element contained within a valve chamber formed in a second passage between the inlet and outlet ports to cooperate with a second annular valve seat fixed to one end portion of the piston. The one end portion of the piston is formed therein with a passage arranged to permit fluid flow passing through the second valve seat between the valve chamber and the outlet port.
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: December 31, 1985
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Yoshiharu Adachi, Masamoto Ando, Takashi Nagashima
  • Patent number: 4552413
    Abstract: An anti-skid brake control system which includes a method and apparatus for anti-skid brake control of the vehicle utilizing a first and second electromagnetic valves that controls operation of the at least one rear wheel and at least one rear brake of the vehicle which includes the steps of registering a first predetermined rear wheel rotational velocity standard and a predetermined rear wheel receleration rate upon braking of the vehicle, registering an actual rear wheel deceleration rate of the vehicle, establishing a predetermined velocity differential for operation of the first electromagnetic valve, establishing a second predetermined rear wheel rotational velocity standard, calculating a time period for changing from the first velocity standard to the second velocity standard, comparing the predetermined deceleration rate with the actual deceleration rate, comparing the predetermined velocity differential with the difference between the first and second velocity standards when the actual deceleration r
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: November 12, 1985
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Takashi Fujii, Masamoto Ando, Takumi Nishimura
  • Patent number: 4269456
    Abstract: An anti-skid brake pressure control system which includes a first brake pressure supply line communicating a first source of a tandem master cylinder with a first wheel cylinder, a second brake pressure supply line communicating a second source of the tandem master cylinder with a second wheel cylinder, a cut off valve mechanism arranged within the first supply line and normally maintained in a open position, a servo member having a power piston to thereby define first and second chambers, a solenoid valve mechanism actuated in response to a wheel locking condition to thereby create a pressure differential between the first and second chambers and to thereby activate the power piston, a brake pressure reducing member including a pressure reducing piston movable in response to movement of the servo member to reduce an effective volume of a variable bore, and a pressure reducing valve mechanism operated in response to movement of the pressure reducing piston to bring both of the wheel cylinders into communicati
    Type: Grant
    Filed: October 5, 1978
    Date of Patent: May 26, 1981
    Assignee: Aisin Seiki Company, Limited
    Inventors: Toshiyuki Kondo, Masamoto Ando
  • Patent number: 4229052
    Abstract: A hydraulic pressure control system for a split brake system including a tandem master cylinder, first and second wheel brakes, a first braking line between one of the tandem master cylinder and the first wheel brake, a second braking line between the other of the tandem master cylinders and the second wheel brake, an anti-skid actuator positioned within the first braking line to thereby decrease and increase brake fluid pressure transmitted to the first wheel brake in response to rotational conditions of the wheels, and a control valve assembly communicating with the first braking line between the anti-skid actuator and the first wheel brake at a first side thereof, and communicating with the second braking line at a second side thereof, the control valve assembly including a normally open valve member interrupting the second braking line when fluid pressure within the first braking line attains a predetermined value, and balance piston means being balanced by means of fluid pressure transmitted to the first
    Type: Grant
    Filed: January 9, 1979
    Date of Patent: October 21, 1980
    Assignee: Aisin Seiki Company, Limited
    Inventors: Toshiyuki Kondo, Masamoto Ando
  • Patent number: 4229049
    Abstract: A hydraulic pressure control system for a split brake system which includes a tandem master cylinder having first and second hydraulic pressure sources, at least first and second wheel cylinders, a first brake pressure supply line communicating the first source with the first wheel cylinder, a second brake pressure supply line communicating the second source with the second wheel cylinder, a first hydraulic pressure control device positioned within the first supply line for controlling output hydraulic pressure transmitted therefrom with respect to hydraulic pressure transmitted from the first source, and a second hydraulic pressure control device positioned within the second supply line for controlling output hydraulic pressure transmitted therefrom with respect to input hydraulic pressure transmitted from the second source in response to the output hydraulic pressure transmitted from the first control device such that the output pressures of the first and second control device are proportionally controlled.
    Type: Grant
    Filed: October 4, 1978
    Date of Patent: October 21, 1980
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Masamoto Ando
  • Patent number: 4212500
    Abstract: This invention relates to a hydraulic pressure control valve arrangement for automotive vehicle wheel brake systems, the latter system comprising a hydraulic master cylinder to be actuated by operating a foot brake pedal, a hydraulic brake pressure control valve assembly provided with a pneumatic servo piston mechanism, and an electromagnetic change-over valve assembly fluidically connected therewith, a skid sensor operatively connected therewith and also with a vehicle wheel, a wheel cylinder mechanism for applying hydraulic braking effort upon vehicle wheels and includes the provision for an inertia responsive valve for additionally controlling the braking fluid pressure reapplication in the wheel cylinders so as to have that reapplication be rapid at first to the fullest extent in accordance with the road coefficient and then becomes gradual.
    Type: Grant
    Filed: June 1, 1978
    Date of Patent: July 15, 1980
    Assignees: Aisin Seiki Kabushiki Kaisha, Toyota Jidosha Kogyo Kabushiki Kaisha
    Inventors: Masamoto Ando, Yoshihisa Nomura, Takaaki Ohta