Patents by Inventor Mitsuhiko Harara

Mitsuhiko Harara 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: 4730843
    Abstract: Wheel suspension units each having fluid spring chambers are arranged in a vehicle suspension apparatus. A roll control quantity determined in accordance with the relationship between a vehicle velocity and a steering angular velocity, i.e., inlet solenoid valves and exhaust solenoid valves, are controlled in accordance with a solenoid ON/OFF time, thereby controlling the roll of a vehicle.
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: March 15, 1988
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Shinichi Takeuchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe
  • Patent number: 4697237
    Abstract: A microcomputer performs roll control and communication control. In roll control, when the steering state detecting means and vehicle velocity detecting means detect a factor which causes a roll state of the vehicle body, a second control signal is produced to open desired supply and exhaust control valve so as to supply a preset amount of fluid to the fluid spring chambers of contracted suspension units and to exhaust a preset amount of fluid from the fluid spring chambers of stretched suspension units. In communication control, a first control signal is supplied to the communicating means to open the communication control valve when the steering state sensor detects that the steering angle falls within a preset steering angle and to close the communication control valve otherwise.
    Type: Grant
    Filed: November 14, 1985
    Date of Patent: September 29, 1987
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai
  • Patent number: 4695074
    Abstract: In a vehicle suspension apparatus having air spring chambers between the vehicle body and the respective wheels to perform height and position control modes by controlling supply control valve means for supplying air to the air spring chambers and exhaust control valve means for exhausting air from the air spring chambers, the vehicle suspension apparatus has a high-pressure reserve tank connected to the respective chambers through the supply control valves, a first compressor for supplying compressed air to the high-pressure reserve tank, a low-pressure reserve tank connected to the respective chambers through the corresponding exhaust control valves and the suction port of the first compressor, and a second compressor for supplying atmospheric air to the high-pressure reserve tank through a check valve and a drier arranged between the check valve and the second compressor.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: September 22, 1987
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Kazuyoshi Kobayashi, Shozo Takizawa, Tadao Tanaka, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai
  • Patent number: 4673193
    Abstract: In a vehicle suspension apparatus, front and rear wheel suspension units respectively have air spring chambers. Air is supplied to predetermined air spring chambers from an air source through a supply control valve, and at the same time air is exhausted from remaining air spring chambers through an exhaust control valve. Three-directional valves are inserted between the respective air spring chambers and the exhaust control valve. One end of a front wheel communication path is connected to the front left wheel three-directional valve and the other end of the path is connected to the front right wheel three-directional valve. Similarly, one end of a rear wheel communication path is connected to the rear left wheel three-directional valve and the other end of the path is connected to the rear right wheel three-directional valve.
    Type: Grant
    Filed: May 17, 1985
    Date of Patent: June 16, 1987
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Kazuyoshi Kobayashi, Shozo Takizawa, Tadao Tanaka, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Naotake Kumagai, Minoru Tatemoto
  • Patent number: 4669749
    Abstract: In a vehicle suspension apparatus comprising communication control means for producing a disabling control signal for disabling the communicating solenoid valves when conditions are satisfied that the velocity detected by the velocity sensor exceeds a preset velocity and the steering angle detected by the steering sensor exceeds a preset steering angle and for producing an enabling control signal when the conditions are not satisfied, and roll control means for producing a control command signal for opening desired ones of the supply and exhaust control valves for a preset control time in order to supply a preset amount of fluid to contracted fluid spring chambers along a roll direction and for exhausting a preset amount of fluid from stretched fluid spring chambers when the conditions are satisfied, the preset velocity as one of the conditions determined by the communication control means is set to have a first value when the communicating solenoid valves are enabled and to have a second value larger than th
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: June 2, 1987
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai
  • Patent number: 4669750
    Abstract: A vehicle suspension apparatus has air spring chamber provided at a suspension unit for supporting a rear wheel, air supply means for supplying air to the air spring chamber of the suspension unit for supporting the rear wheel through supply opening and closing valve, air exhaust means for exhausting air from the air spring means of the suspension unit for supporting the rear wheel, a parking brake sensor for detecting the operated state of a parking brake, and a shift position detecting sensor for detecting the shift position of an automatic transmission having a fluid drive unit for transmitting drive power to wheels. The parking brake sensor detects whether or not the parking brake is engaged.
    Type: Grant
    Filed: August 13, 1985
    Date of Patent: June 2, 1987
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Mitsuhiko Harara, Tasutaka Taniguchi, Masanaga Suzumura, Shozo Takizawa, Naotake Kumagai, Minoru Tatemoto
  • Patent number: 4648622
    Abstract: A suspension device for automobile performs changing-over of the damping force of a shock absorber and the spring constant of a suspension spring by an output from an acceleration sensor or an output from a road clearance sensor mounted on the vehicle body. The changing operation is not performed by magnitude of an output but is performed only when an output greater that a predetermined level continues for a predetermined time period to avoid unnecessary change-over operations of the suspension characteristic during cruising a rough road.
    Type: Grant
    Filed: June 10, 1986
    Date of Patent: March 10, 1987
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Shunichi Wada, Setsuhiro Shimomura, Naotake Kumagai, Shozo Takizawa, Mitsunori Maruyama, Minoru Tatemoto, Hiroyuki Takada, Mitsuhiko Harara
  • Patent number: 4640526
    Abstract: A vehicle suspension apparatus including suspension units each provided for each wheel and having an air spring chamber is disclosed, in which rolling control and vehicle height control are done through control of air to and from the air spring chambers. The driving of a reservoir tank for storing compressed air to be supplied to the air spring chambers, is inhibited until the engine operation has been stabilized after the start of the engine preset level. In this way, the problems in the engine lubrication and idling are solved, and the defficiencies of the starting property of the engine are overcome.
    Type: Grant
    Filed: April 25, 1985
    Date of Patent: February 3, 1987
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe, Shozo Takizawa
  • Patent number: 4639014
    Abstract: The characteristic of the suspension is held to be a soft one when the vehicle is running along a flat surface, while it is automatically switched by the switch unit to a hard one when the cycle period T of vertical vibration of the vehicle height becomes near the cycle of the natural vibration of sprung mass of the suspension at the time of running along a road having an irregular surface or jumping a projection, thereby suppressing the resonance of the vehicle body due to external force applied from the road to improve the comfortability.
    Type: Grant
    Filed: April 25, 1985
    Date of Patent: January 27, 1987
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe, Shozo Takizawa
  • Patent number: 4625992
    Abstract: A suspension apparatus has suspension units which have individual fluid spring chambers and are arranged on the wheels. When a detected negative acceleration (deceleration) exceeds a reference negative deceleration, front wheel fluid supply valves are opened for a control time T to supply a predetermined amount of fluid to the front wheel spring chambers and rear wheel fluid extent valves are opened for the control time T to exhaust a predetermined amount of fluid from the rear wheel fluid spring chambers, thereby decreasing nose dive at the time of deceleration.
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: December 2, 1986
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Shinichi Takeuchi, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe
  • Patent number: 4625994
    Abstract: A suspension apparatus has suspension units mounted on wheels and each unit has a fluid spring chamber. Fluid is supplied to contracted fluid spring chambers and is exhausted from elongated fluid spring chambers to control the change in position of the vehicle. In the position control mode, a large-diameter path is selected to supply or exhaust a large amount of compressed fluid. In the height control mode, a small-diameter path is selected to supply or exhaust a small amount of compressed fluid. The required amounts of compressed fluid can be supplied to the fluid spring chambers in both the position and height control modes.
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: December 2, 1986
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Shinichi Takeuchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe
  • Patent number: 4624476
    Abstract: Wheel suspension units each having fluid spring chambers are arranged in a vehicle suspension apparatus. A roll control quantity, determined in accordance with the relationship between a vehicle velocity and a steering angle, i.e., inlet solenoid valves and exhaust solenoid valves are controlled in accordance with solenoid ON/OFF time, thereby controlling rolling of the vehicle.
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: November 25, 1986
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Shinichi Takeuchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe
  • Patent number: 4613154
    Abstract: Air spring chambers are provided in suspension units of respective wheels, and air intake solenoid valves and exhaust solenoid valves are provided corresponding to the air spring chambers. Further, switching means for switching the suspension units between the hard and soft states is provided, and when the vehicle's velocity, detected by the vehicle velocity sensors, is less than the set velocity, the suspension units are set to the soft state, and when the vehicle's velocity is the set velocity or higher, the suspension units are set to the hard state to control the switching means in a vehicle suspension apparatus.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: September 23, 1986
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai
  • Patent number: 4605244
    Abstract: A vehicle suspension apparatus including suspension units each provided for each wheel and having an air spring chamber is disclosed. When steering wheel is quickly returned toward the center position at the time of a slalom running, it is detected from the steering angular velocity and vehicle velocity that the vehicle body has begun to be returned to a neutral state, and communication control valves are opened before the reaching of the center position, i.e., before the steering angle reaches an insensitive range. Rolling control thus can be improved without delay in the restoration of the position of the vehicle body even at the time of a high speed slalom running, at which time the steering wheel is repeatedly operated quickly.
    Type: Grant
    Filed: April 25, 1985
    Date of Patent: August 12, 1986
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe, Shozo Takizawa
  • Patent number: 4602805
    Abstract: The front wheel exhaust valves and the rear wheel supply valves are opened for a predetermined period of time when rapid acceleration of the vehicle is detected by the accelerator pedal sensor and the gear position sensor, the absolute value of change in vehicle position and its velocity can be properly controlled. Therefore, comfort and steering stability can be improved as compared with vehicles mounting of the conventional apparatus. In addition, since an acceleration state is detected by the gear position sensor as well as the accelerator pedal sensor, rapid acceleration of the vehicle can be accurately detected, thereby preventing unnecessary position control.
    Type: Grant
    Filed: April 25, 1985
    Date of Patent: July 29, 1986
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tadao Tanaka, Sunao Chikamori, Mitsuhiko Harara, Yasutaka Taniguchi, Masanaga Suzumura, Minoru Tatemoto, Naotake Kumagai, Hiroki Abe
  • Patent number: 4598929
    Abstract: When an automobile or other vehicle travels over a bump with a suspension in its switchable suspension system kept in a "soft" state, the car body pitches violently. This pitching is reduced by turning the suspension into a "hard" state by increasing the damping capacity of its shock absorber and the spring constant of its air-spring chambers in accordance with a signal supplied from a car-height sensor detecting the compressed or stretched condition of the suspension. The change of the spring constant is executed with the following construction: an auxiliary air-spring chamber resting above a main air-spring chamber surrounding a piston rod, and an air passage within the piston rod for intercommunicating the main and auxiliary air-spring chambers are provided in the system, and the connection and disconnection between the two chambers through the air passage are controlled by the piston rod and a control rod extending in the piston rod.
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: July 8, 1986
    Assignee: Mitsubishi Jidosha Kogyo K.K.
    Inventors: Naotake Kumagai, Minoru Tatemoto, Shozo Takizawa, Hiroyuki Takada, Mitsuhiko Harara
  • Patent number: 4575115
    Abstract: A vehicle height control system capable, even if the height of the front side of the vehicle body is raised during the preceding vehicle height control operation by the agency of starting acceleration and the inertia of the body, and thereby the preceding vehicle height control operation for the front side is completed and the height of the front side is lowered thereafter due to the transition of the running mode of the vehicle from an accelerating mode to a constant-speed running mode, of advancing the timing of initiation of the succeeding vehicle height control operation to adjust the height of the front side to a standard height.
    Type: Grant
    Filed: May 15, 1984
    Date of Patent: March 11, 1986
    Assignees: Mitsubishi Jidosha Kogyo K.K., Mitsubishi Denki K.K.
    Inventors: Minoru Tatemoto, Mitsuhiko Harara