Patents by Inventor Takeshi Yoneda
Takeshi Yoneda 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).
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Patent number: 9199650Abstract: A vehicle driving force control device controls engine torque so as to correct driver's request-engine-torque with the torque-down amount by an engine control unit, the torque-down amount being set into the lower one of a first torque-down amount and a second torque-down amount by a control-amount setting unit, the first torque-down amount being calculated on the basis of a relation between a tire force generated on a tire and a maximum tire force which the tire is capable of exercising against a current road-surface by a first traction control unit, the second torque-down amount being calculated on the basis of a slip rate of the tire by a second traction control unit.Type: GrantFiled: March 20, 2008Date of Patent: December 1, 2015Assignee: FUJI JUKOGYO KABUSHIKI KAISHAInventors: Koji Matsuno, Takeshi Yoneda
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Patent number: 8958552Abstract: A certification device 101 encrypts a feature vector for registration by using a random number and a public key which is set to correspond to a secret key in a decryption device 103. The encrypted feature vector for registration is registered in an authentication device 102. In authentication, the certification device encrypts a feature vector for authentication by using the public key and a random number. With the two encrypted feature vectors being kept encrypted, the authentication device generates encrypted similarity degree information from which the decryption device can derive the similarity degree between the two feature vectors by a decryption process using the secret key. The decryption device 103 decrypts the encrypted similarity degree information to derive the similarity degree of the plaintext. The authentication device 102, if the similarity degree is equal to or larger than a threshold, determines that the user is the correct user.Type: GrantFiled: October 29, 2009Date of Patent: February 17, 2015Assignee: Mitsubishi Electric CorporationInventors: Mitsuhiro Hattori, Yoichi Shibata, Takashi Ito, Nori Matsuda, Katsuyuki Takashima, Takeshi Yoneda
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Patent number: 8958967Abstract: A braking-force control device has a brake control function for performing brake control on a front outside wheel when a vehicle is detected to be in an oversteer condition during a turning operation and for performing brake control on a rear inside wheel when the vehicle is detected to be in an understeer condition during a turning operation. For preventing the oversteer condition, a command for reducing the engine torque is output. On the other hand, for preventing the understeer condition, the engine torque is limited in accordance with a permissible engine torque value that is calculated on the basis of a road-surface friction coefficient, and ground loads and lateral tire forces of individual wheels. If it is detected that engine braking is in operation, the engine torque is adjusted to substantially zero.Type: GrantFiled: February 25, 2008Date of Patent: February 17, 2015Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Koji Matsuno, Takeshi Yoneda, Masato Igarashi, Yosuke Morokuma
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Patent number: 8615668Abstract: A confidential search that can flexibly control searchable data depending on a role or authority of a user when the data is shared in a group. When the inner product of an attribute vector and a predicate vector is a predetermined value, the confidential search system conducts pairing computation of decrypted data generated based on the attribute vector and a decryption key generated based on the predicate vector, so as to realize confidential search by utilizing an inner-product predicate encryption process that can decrypt the encrypted data. In particular, the confidential search system enables flexible control of searchable data depending on the role or authority of the user, by devising a method of generating the attribute vector and the predicate vector.Type: GrantFiled: January 15, 2010Date of Patent: December 24, 2013Assignee: Mitsubishi Electric CorporationInventors: Nori Matsuda, Mitsuhiro Hattori, Takashi Ito, Takeshi Yoneda
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Patent number: 8479001Abstract: In a system where a communication device performs secure communication by using a digital certificate, to enable a device of a communication party to verify that a self certificate is certainly generated by a device indicated on the self certificate even if the self certificate is not delivered offline in advance. Based on a master key and a public parameter, a communication device generates an ID-based encryption private key for which a device unique ID is used as a public key. Then, the communication device generates the digital signature of an RSA public key as a ID-based encryption signature by using the ID-based encryption private key. Then, the communication device generates an RSA self signature for the RSA public key, an expiration date, a host name, the device unique ID, and the ID-based encryption signature as the target. Then, the communication device generates a self-signed certificate to include the ID-based encryption signature and the RSA self signature.Type: GrantFiled: December 9, 2009Date of Patent: July 2, 2013Assignee: Mitsubishi Electric CorporationInventors: Takeshi Yoneda, Nobuhiro Kobayashi
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Patent number: 8424054Abstract: Secret key backup is safely implemented even if a role base access structure in which the access structure is specified using roles is used. An all combination generating unit 107 obtains a backup participating user list 201 which is a list of backup participating users and a list of validated roles validated by the users, and a role base access structure 202 which is a combination of specified roles by which a secret key 205 can be restored, and generates an all combination extracted result which is all combinations of restoration enabling users of the secret key by applying users described in the backup participating user list 201 to the specified role. A same user/role deleting unit 108, etc. deletes a combination showing the same user redundantly, etc.Type: GrantFiled: March 5, 2009Date of Patent: April 16, 2013Assignee: Mitsubishi Electric CorporationInventors: Nori Matsuda, Mitsuhiro Hattori, Takeshi Yoneda
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Publication number: 20120324240Abstract: In a secure search system to be used by a plurality of users, the size of a ciphertext is reduced and the need to generate a new ciphertext when a new user is added is eliminated. A public parameter generation device 100 generates a pair of a public parameter and a master secret key. Using the public parameter, an encryption device 400 encrypts a keyword and generates a ciphertext. Using the master secret key, a user secret key generation device 200 generates a user secret key of a query issuing device 300. Using the user secret key, the query issuing device 300 generates a query for searching for the keyword. Based on the ciphertext and the query, a search device 500 determines whether a hit is obtained for searching.Type: ApplicationFiled: January 13, 2010Publication date: December 20, 2012Applicant: Mitsubishi Electric CorporationInventors: Mitsuhiro Hattori, Takumi Mori, Takashi Ito, Nori Matsuda, Katsuyuki Takashima, Takeshi Yoneda
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Publication number: 20120297201Abstract: A confidential search that can flexibly control searchable data depending on a role or authority of a user when the data is shared in a group. When the inner product of an attribute vector and a predicate vector is a predetermined value, the confidential search system conducts pairing computation of decrypted data generated based on the attribute vector and a decryption key generated based on the predicate vector, so as to realize confidential search by utilizing an inner-product predicate encryption process that can decrypt the encrypted data. In particular, the confidential search system enables flexible control of searchable data depending on the role or authority of the user, by devising a method of generating the attribute vector and the predicate vector.Type: ApplicationFiled: January 15, 2010Publication date: November 22, 2012Applicant: Mitsubishi Electric CorporationInventors: Nori Matsuda, Mitsuhiro Hattori, Takashi Ito, Takeshi Yoneda
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Patent number: 8286005Abstract: A tamper resistant apparatus 101 is mounted inside of a PC 900 and stores confidential information A through C. The tamper resistant apparatus 101 receives data from an application 118 which operates on the PC 900, processes the data using the confidential information A through C, and returns processed data to the application 118. To the tamper resistant apparatus 101, plural external sensors 110 provided to the PC 900 are connected. The plural external sensors 110 detect opening/closing of a case of the PC 900 or movement of the body of the PC 900 and send a detection signal to the tamper resistant apparatus 101. On inputting the detection signal from the plural external sensors 110, the tamper resistant apparatus 101 selects and erases confidential information to be erased from the confidential information A through C according to the tamper resistant policy stored previously.Type: GrantFiled: March 27, 2007Date of Patent: October 9, 2012Assignee: Mitsubishi Electric CorporationInventors: Nori Matsuda, Mitsuhiro Hattori, Takeshi Yoneda
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Publication number: 20120207299Abstract: A certification device 101 encrypts a feature vector for registration by using a random number and a public key which is set to correspond to a secret key in a decryption device 103. The encrypted feature vector for registration is registered in an authentication device 102. In authentication, the certification device encrypts a feature vector for authentication by using the public key and a random number. With the two encrypted feature vectors being kept encrypted, the authentication device generates encrypted similarity degree information from which the decryption device can derive the similarity degree between the two feature vectors by a decryption process using the secret key. The decryption device 103 decrypts the encrypted similarity degree information to derive the similarity degree of the plaintext. The authentication device 102, if the similarity degree is equal to or larger than a threshold, determines that the user is the correct user.Type: ApplicationFiled: October 29, 2009Publication date: August 16, 2012Applicant: Mitsubishi Electric CorporationInventors: Mitsuhiro Hattori, Yoichi Shibata, Takashi Ito, Nori Matsuda, Katsuyuki Takashima, Takeshi Yoneda
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Patent number: 8244432Abstract: A road-surface friction-coefficient estimating device compares a rack-thrust-force deviation value with a preliminarily set maximum-value-determination threshold value. If the rack-thrust-force deviation value is above the maximum-value-determination threshold value, the device determines that tires are slipping, and sets a front-wheel friction-circle utilization rate in that state as a road-surface friction coefficient. If the rack-thrust-force deviation value is below the maximum-value-determination threshold value, the device refers to a preliminarily set map to determine a restoring speed at which the road-surface friction coefficient is to be restored to 1.0 based on a vehicle speed and a front-wheel slip angle. While restoring the road-surface friction coefficient at the restoring speed, the device calculates and outputs the road-surface friction coefficient.Type: GrantFiled: April 11, 2008Date of Patent: August 14, 2012Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Masaru Kogure, Koji Matsuno, Takeshi Yoneda
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Patent number: 8135524Abstract: A driving force control device includes an individual-wheel friction-circle limit-value calculating portion that calculates friction-circle limit-values of individual wheels, an individual-wheel requested-resultant-tire-force calculating portion that calculates requested resultant tire forces of the individual wheels, an individual-wheel resultant-tire-force calculating portion that calculates resultant tire forces of the individual wheels, an individual-wheel requested-excessive-tire-force calculating portion that calculates requested excessive tire forces of the individual wheels, an individual-wheel excessive-tire-force calculating portion that calculates excessive tire forces of the individual wheels, an excessive-tire-force calculating portion that calculates an excessive tire force, an over-torque calculating portion that calculates an over-torque, and a control-amount calculating portion that calculates a control amount that is output to an engine control unit.Type: GrantFiled: January 24, 2008Date of Patent: March 13, 2012Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Takeshi Yoneda, Keisuke Hosokawa, Koichi Inoue, Hirowatari Yosuke, Tomohiro Yamada, Koji Matsuno, Masaru Kogure, Satoru Akiyama, Masato Igarashi, Yosuke Morokuma
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Publication number: 20120036364Abstract: In a system where a communication device performs secure communication by using a digital certificate, to enable a device of a communication party to verify that a self certificate is certainly generated by a device indicated on the self certificate even if the self certificate is not delivered offline in advance. Based on a master key and a public parameter, a communication device generates an ID-based encryption private key for which a device unique ID is used as a public key. Then, the communication device generates the digital signature of an RSA public key as a ID-based encryption signature by using the ID-based encryption private key. Then, the communication device generates an RSA self signature for the RSA public key, an expiration date, a host name, the device unique ID, and the ID-based encryption signature as the target. Then, the communication device generates a self-signed certificate to include the ID-based encryption signature and the RSA self signature.Type: ApplicationFiled: December 9, 2009Publication date: February 9, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takeshi Yoneda, Nobuhiro Kobayashi
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Patent number: 8074266Abstract: By enabling to write information which is readable only by an IC card owner on an IC card without inputting a PIN and to authenticate a creator of the written information and prevent falsification, it is guaranteed that data written on the IC card can be read only by the IC card owner, the creator of the written data can be specified, and the written data has not been falsified. A secure memory card 101 includes a card private key storing unit 208 storing a private key, a card certificate storing unit 202 storing a certificate of a public key which forms a pair with the private key, a certificate sending unit 201 sending the certificate to a PC 102, a private storing unit 203 which is readable/writable from the outside only when a correct PIN is input, a public storing unit 210 which is readable/writable from the outside without checking a PIN, a confidential data receiving unit 211 receiving confidential data from the PC 102, and so on.Type: GrantFiled: August 20, 2004Date of Patent: December 6, 2011Assignee: Mitsubishi Electric CorporationInventor: Takeshi Yoneda
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Patent number: 8055420Abstract: A main controller calculates permissible driving forces of individual wheels from a road-surface friction coefficient, ground loads of the individual wheels, and lateral forces of the individual wheels. The main controller then calculates a permissible engine torque on the basis of the calculated permissible driving forces so as to limit engine output. In addition, based on the calculated permissible driving forces, the main controller calculates a transfer-clutch torque for front-rear driving-force distribution control, a rear-wheel torque shift amount for left-right driving-force distribution control, and a steering-angle correction amount for steering-angle control.Type: GrantFiled: February 25, 2008Date of Patent: November 8, 2011Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Koji Matsuno, Takeshi Yoneda, Masato Igarashi, Yosuke Morokuma
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Publication number: 20110016510Abstract: Secret key backup is safely implemented even if a role base access structure in which the access structure is specified using roles is used. An all combination generating unit 107 obtains a backup participating user list 201 which is a list of backup participating users and a list of validated roles validated by the users, and a role base access structure 202 which is a combination of specified roles by which a secret key 205 can be restored, and generates an all combination extracted result which is all combinations of restoration enabling users of the secret key by applying users described in the backup participating user list 201 to the specified role. A same user/role deleting unit 108, etc. deletes a combination showing the same user redundantly, etc.Type: ApplicationFiled: March 5, 2009Publication date: January 20, 2011Applicant: Mitsubishi Electric CorporationInventors: Nori Matsuda, Mitsuhiro Hattori, Takeshi Yoneda
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Publication number: 20100290627Abstract: In distribution and sharing of a cipher key to be used when performing encrypted communication among a plurality of terminals, to share a cipher key without the need for each terminal to constantly hold and manage a large number of keys. Also, to shorten the time needed to start terminal-to-terminal encrypted communication. Also, to improve the portability of the terminal. A key management server 1 sends by broadcast communication a cipher key, which is specific to each set of terminals that perform encrypted communication, one-sidedly to the respective terminals. The key management server 1 sends, by broadcast communication, cipher key data obtained by encrypting the cipher key by using a device public key which is the public key of an addressed terminal. Each terminal acquires cipher key data addressed to itself and decrypts the acquired cipher key data, thus obtaining a cipher key.Type: ApplicationFiled: February 9, 2009Publication date: November 18, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hirosato Tsuji, Takeshi Yoneda, Kazumi Saito
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Patent number: 7784577Abstract: In a driving-force distribution control unit, a first transfer-torque calculation unit calculates an input-torque sensitive transfer torque, a second transfer-torque calculation unit calculates a steering-angle/yaw-rate sensitive transfer torque, and a third transfer-torque calculation unit calculates a tack-in preventing transfer torque. In the third transfer-torque calculation unit, tack-in prevention control is performed during turning at a high speed not only when the accelerator opening is substantially reduced and the current accelerator opening becomes small, but also when the torque amount to be reduced by a traction control unit is more than a preset value. Further, when at least one of a side-slip prevention control unit and an ABS is started, tack-in prevention control is prohibited.Type: GrantFiled: September 30, 2008Date of Patent: August 31, 2010Assignee: Fuji Jukogyo Kabushiki KaishaInventor: Takeshi Yoneda
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Patent number: 7717224Abstract: The present invention offers a power steering device for a four-wheel drive, which includes: a first self-aligning torque estimation unit for estimating a self-aligning torque generated in a current vehicle behavior as a first self-aligning torque; a second self-aligning torque estimation unit for estimating a self-aligning torque that is to influence a subsequent vehicle behavior as a second self-aligning torque; a self-aligning torque change amount calculation unit for calculating a difference of the second self-aligning torque from the first self-aligning torque as a self-aligning torque change amount; and an assisting force correction unit for determining and outputting a corrected value of an assisting force to be generated for a steering operation based on the self-aligning torque change amount.Type: GrantFiled: January 10, 2006Date of Patent: May 18, 2010Assignee: Fuji Jukogyo Kabashiki KaishaInventors: Takeshi Yoneda, Yoshinobu Yamazaki, Kazuo Kanazawa, Makoto Shibuya, Hiroyuki Kiryu
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Patent number: 7680576Abstract: To maintain operating safety by driving force distribution control system when an abnormal state arises and to smoothly transition from a normal state to an abnormal state without sudden changes in vehicle behavior. The driving force distribution control part calculates the transfer torque for the transfer clutch for the center differential device and the torque movement for the hydraulic motor for the rear wheel final reduction gear. When the control state detection part detects an abnormal state, there is control of the hydraulic motor in the direction that torque movement is lost on the one hand, and the transfer torque for the transfer clutch is controlled in the direction of front and rear distribution; after a preset time and after this control is carried out, the transfer torque drops.Type: GrantFiled: July 23, 2007Date of Patent: March 16, 2010Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Tatsunori Nagura, Takeshi Yoneda, Yoshinobu Yamazaki