Patents by Inventor Tokuji Kuronita
Tokuji Kuronita 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: 8175789Abstract: As a compression-ignition direct-injection engine combustion controller, a program for detecting ignition timing of a main injection Mn (main ignition timing), a program for correcting a command value of main injection execution timing in a direction to the side where a detection value is converged within a predetermined range, a program for determining whether or not the corrected command value is within a predetermined range, and a program for, when it is determined that the command value is not within the range, correcting a command value related to an injection amount of a pilot injection Pt based on whether or not the command value is on a delay side or an advance side of the range.Type: GrantFiled: April 2, 2008Date of Patent: May 8, 2012Assignee: Denso CorporationInventors: Akikazu Kojima, Hiroshi Haraguchi, Youhei Morimoto, Tokuji Kuronita, Satoru Sasaki
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Patent number: 8074630Abstract: An internal combustion engine control device and an internal combustion engine control system are disclosed as applied to an internal combustion engine having external EGR regulating device for regulating an external EGR amount in which a part of exhaust gases is recirculated from an exhaust gas passage to an air-intake passage, an internal EGR regulating device for regulating an internal EGR amount in which a part of combusted gases remains in a cylinder. External and internal EGR ratio control means controls operations of the external EGR regulating device and the internal EGR regulating device to variably control a ratio between the external EGR amount and the internal EGR amount depending on a surrounding atmospheric pressure.Type: GrantFiled: April 23, 2009Date of Patent: December 13, 2011Assignee: Denso CorporationInventors: Satoru Sasaki, Tokuji Kuronita
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Patent number: 7987696Abstract: A fuel distillation property determining apparatus for use in a multi-injection system for diesel engines. The apparatus acquires a physical quantity indicating a state of burning of fuel in the diesel engine, determines a physical quantity variation sensitivity defined by a ratio of a quantity variation that is a difference between a first value of the physical quantity, as acquired upon execution of a first one of a sequence of sub-injections, and a second value of the physical quantity, as acquired upon execution of a following one of the sub-injections, to a difference between a first quantity of fuel sprayed in the first sub-injection and a second quantity of fuel sprayed in the following sub-injection, and determine a cetane value of the fuel based on a predefined relation between the physical quantity variation sensitivity and the cetane value. This ensures the accuracy in determining the cetane value at low costs.Type: GrantFiled: December 11, 2008Date of Patent: August 2, 2011Assignee: Denso CorporationInventors: Tokuji Kuronita, Satoru Sasaki
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Patent number: 7870845Abstract: A fuel injection control device controls an operation of an injector such that fuel to be injected into a combustion chamber per combustion cycle is divided and injected at least through a first injection and a second injection, which is performed with a larger fuel quantity than the first injection after the first injection. The fuel injection control device includes an acquiring section and a first combustion state estimating section. The acquiring section acquires a sensing value of cylinder pressure in the combustion chamber sensed with a cylinder pressure sensor. The first combustion state estimating section estimates an actual combustion state of the fuel injected by the first injection based upon a second combustion timing cylinder pressure sensing value attributable to combustion of the fuel injected by the second injection out of the cylinder pressure sensing values.Type: GrantFiled: August 15, 2008Date of Patent: January 18, 2011Assignee: Denso CorporationInventors: Satoru Sasaki, Tokuji Kuronita, Youhei Morimoto
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Patent number: 7831370Abstract: An apparatus is provided to control injection of fuel into an engine with a combustion engine. The fuel is injected into the combustion chamber as a preliminary sub injection and a main injection following the preliminary sub injection. The preliminary sub injection repeats one or more times and is less in an amount of the fuel than the main injection. The apparatus comprises acquisition means and a control unit. The acquisition means acquires a parameter showing at least one of a state of an exhaust gas exhausted from the cylinder after the combustion of the fuel and a constituent of the exhaust gas. The control unit includes variably setting means for variably setting a mode of the preliminary sub injection depending on the parameter acquired by the acquisition means.Type: GrantFiled: January 16, 2008Date of Patent: November 9, 2010Assignee: Denso CorporationInventors: Tokuji Kuronita, Satoru Sasaki
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Patent number: 7798430Abstract: A fuel injection nozzle is formed with a nozzle hole group including at least two individual nozzle holes, which are disposed close to each other. Fuel is injected through the nozzle hole group. In at least one combination of two adjacent individual nozzle holes included in the same nozzle hole group, at least one of the two adjacent individual nozzle holes is configured such that each of the at least one of the two adjacent individual nozzle holes has a diameter, the diameter increasing only toward a corresponding adjacent one of the two adjacent individual nozzle holes along a direction from an inside to an outside of the each of the at least one of the two adjacent individual nozzle holes, and the diameter being maximized at an outer opening of the each of the at least one of the two adjacent individual nozzle holes.Type: GrantFiled: September 4, 2007Date of Patent: September 21, 2010Assignee: Denso CorporationInventors: Tokuji Kuronita, Satoru Sasaki
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Publication number: 20090266345Abstract: An internal combustion engine control device and an internal combustion engine control system are disclosed as applied to an internal combustion engine having external EGR regulating device for regulating an external EGR amount in which a part of exhaust gases is recirculated from an exhaust gas passage to an air-intake passage, an internal EGR regulating device for regulating an internal EGR amount in which a part of combusted gases remains in a cylinder. External and internal EGR ratio control means controls operations of the external EGR regulating device and the internal EGR regulating device to variably control a ratio between the external EGR amount and the internal EGR amount depending on a surrounding atmospheric pressure.Type: ApplicationFiled: April 23, 2009Publication date: October 29, 2009Applicant: DENSO CORPORATIONInventors: Satoru Sasaki, Tokuji Kuronita
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Publication number: 20090145199Abstract: A fuel distillation property determining apparatus for use in a multi-injection system for diesel engines. The apparatus acquires a physical quantity indicating a state of burning of fuel in the diesel engine, determines a physical quantity variation sensitivity defined by a ratio of a quantity variation that is a difference between a first value of the physical quantity, as acquired upon execution of a first one of a sequence of sub-injections, and a second value of the physical quantity, as acquired upon execution of a following one of the sub-injections, to a difference between a first quantity of fuel sprayed in the first sub-injection and a second quantity of fuel sprayed in the following sub-injection, and determine a cetane value of the fuel based on a predefined relation between the physical quantity variation sensitivity and the cetane value. This ensures the accuracy in determining the cetane value at low costs.Type: ApplicationFiled: December 11, 2008Publication date: June 11, 2009Applicant: DENSO CORPORATIONInventors: Tokuji KURONITA, Satoru SASAKI
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Patent number: 7532971Abstract: An engine control apparatus comprised of an engine control ECU has a program preloaded therein for determining a combustion rate (actual combustion rate) corresponding to the ratio of an ideal heat generation quantity (target heat generation quantity) estimated to be generated from a fuel supply quantity, and an actual heat generation quantity actually generated by the fuel supply quantity. The engine control apparatus controls pilot injection timing with a controlled variable corresponding to the thus determined combustion rate so as to increase the combustion rate.Type: GrantFiled: January 2, 2008Date of Patent: May 12, 2009Assignee: Denso CorporationInventors: Satoru Sasaki, Tokuji Kuronita
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Patent number: 7510129Abstract: In a fuel injection nozzle including multiple nozzle hole groups each having multiple solitary nozzle holes, a group distance C between two of the nozzle hole groups is 0.8 or more times larger than an in-group hole distance ? in a nozzle hole group. The group distance C is the minimum interval of inter-group intervals that are formed between (i) peripheral boundaries of solitary nozzle holes belonging to a first nozzle hole group and (ii) peripheral boundaries of solitary nozzle holes belonging to a second nozzle hole group adjacent to the first nozzle hole group. The in-group hole distance ? is the minimum of intervals between peripheral boundaries belonging to each nozzle hole group.Type: GrantFiled: November 4, 2005Date of Patent: March 31, 2009Assignee: DENSO CorporationInventors: Tokuji Kuronita, Satoru Sasaki, Kanehito Nakamura, Masumi Kinugawa
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Publication number: 20090055083Abstract: A fuel injection control device controls an operation of an injector such that fuel to be injected into a combustion chamber per combustion cycle is divided and injected at least through a first injection and a second injection, which is performed with a larger fuel quantity than the first injection after the first injection. The fuel injection control device includes an acquiring section and a first combustion state estimating section. The acquiring section acquires a sensing value of cylinder pressure in the combustion chamber sensed with a cylinder pressure sensor. The first combustion state estimating section estimates an actual combustion state of the fuel injected by the first injection based upon a second combustion timing cylinder pressure sensing value attributable to combustion of the fuel injected by the second injection out of the cylinder pressure sensing values.Type: ApplicationFiled: August 15, 2008Publication date: February 26, 2009Applicant: DENSO CORPORATIONInventors: Satoru Sasaki, Tokuji Kuronita, Youhei Morimoto
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Publication number: 20080243358Abstract: As a compression-ignition direct-injection engine combustion controller, a program for detecting ignition timing of a main injection Mn (main ignition timing), a program for correcting a command value of main injection execution timing in a direction to the side where a detection value is converged within a predetermined range, a program for determining whether or not the corrected command value is within a predetermined range, and a program for, when it is determined that the command value is not within the range, correcting a command value related to an injection amount of a pilot injection Pt based on whether or not the command value is on a delay side or an advance side of the range.Type: ApplicationFiled: April 2, 2008Publication date: October 2, 2008Applicant: DENSO CORPORATIONInventors: Akikazu Kojima, Hiroshi Haraguchi, Youhei Morimoto, Tokuji Kuronita, Satoru Sasaki
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Publication number: 20080172169Abstract: An apparatus is provided to control injection of fuel into an engine with a combustion engine The fuel is injected into the combustion chamber as a preliminary sub injection and a main injection following the preliminary sub injection. The preliminary sub injection repeats one or more times and is less in an amount of the fuel than the main injection The apparatus comprises acquisition means and a control unit. The acquisition means acquires a parameter showing at least one of a state of an exhaust gas exhausted from the cylinder after the combustion of the fuel and a constituent of the exhaust gas. The control unit includes variably setting means for variably setting a mode of the preliminary sub injection depending on the parameter acquired by the acquisition means.Type: ApplicationFiled: January 16, 2008Publication date: July 17, 2008Applicant: DENSO CORPORATIONInventors: Tokuji KURONITA, Satoru Sasaki
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Publication number: 20080167786Abstract: An engine control apparatus comprised of an engine control ECU has a program preloaded therein for determining a combustion rate (actual combustion rate) corresponding to the ratio of an ideal heat generation quantity (target heat generation quantity) estimated to be generated from a fuel supply quantity, and an actual heat generation quantity actually generated by the fuel supply quantity. The engine control apparatus controls pilot injection timing with a controlled variable corresponding to the thus determined combustion rate so as to increase the combustion rate.Type: ApplicationFiled: January 2, 2008Publication date: July 10, 2008Applicant: DENSO CORPORATIONInventors: Satoru SASAKI, Tokuji Kuronita
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Publication number: 20080073452Abstract: A fuel injection nozzle is formed with a nozzle hole group including at least two individual nozzle holes, which are disposed close to each other. Fuel is injected through the nozzle hole group. In at least one combination of two adjacent individual nozzle holes included in the same nozzle hole group, at least one of the two adjacent individual nozzle holes is configured such that each of the at least one of the two adjacent individual nozzle holes has a diameter, the diameter increasing only toward a corresponding adjacent one of the two adjacent individual nozzle holes along a direction from an inside to an outside of the each of the at least one of the two adjacent individual nozzle holes, and the diameter being maximized at an outer opening of the each of the at least one of the two adjacent individual nozzle holes.Type: ApplicationFiled: September 4, 2007Publication date: March 27, 2008Applicant: DENSO CORPORATIONInventors: Tokuji Kuronita, Satoru Sasaki
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Patent number: 7201334Abstract: A fuel injection nozzle includes: an injection outlet having a plurality of injection holes. Each injection hole has an injection hole diameter defined as D, an outlet port and a center axis. The center axes of the injection holes cross at a cross point with a cross angle. A cross point distance between each outlet port of the injection holes and the cross point is defined as X. The cross angle of the center axes of the injection holes is defined as ?. The cross point distance X is in a range between 10 D and 100 D, and the cross angle ? is in a range between 1° and 10°.Type: GrantFiled: August 16, 2006Date of Patent: April 10, 2007Assignee: Denso CorporationInventors: Satoru Sasaki, Tokuji Kuronita, Kanehito Nakamura
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Publication number: 20070039587Abstract: A fuel injection nozzle includes: an injection outlet having a plurality of injection holes. Each injection hole has an injection hole diameter defined as D, an outlet port and a center axis. The center axes of the injection holes cross at a cross point with a cross angle. A cross point distance between each outlet port of the injection holes and the cross point is defined as X. The cross angle of the center axes of the injection holes is defined as ?. The cross point distance X is in a range between 10D and 100D, and the cross angle ? is in a range between 1° and 10°.Type: ApplicationFiled: August 16, 2006Publication date: February 22, 2007Applicant: DENSO CORPORATIONInventors: Satoru Sasaki, Tokuji Kuronita, Kanehito Nakamura
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Patent number: 7069907Abstract: A compression ignition engine injects fuel through injection holes of an injector at a substantially constant injection rate to atomize the fuel so that the fuel can be easily vaporized and to make the fuel penetrate an atmosphere inside a cylinder. A spatial distribution of the injected fuel in which mixing of the fuel and air is promoted as the fuel recedes from the injection hole and the fuel reaches a premixing space where the fuel is premixed with the air is provided. The engine controls oxygen concentration inside the cylinder and an ignition delay so that a ratio of a quantity of the fuel injected before a start of ignition to a total fuel injection quantity falls within a range from 25% to 50% and so that the premixed gas formed in the premixing space is combusted serially.Type: GrantFiled: November 3, 2004Date of Patent: July 4, 2006Assignee: Denso CorporationInventors: Satoru Sasaki, Tsukasa Kuboshima, Kanehito Nakamura, Masumi Kinugawa, Yasuhiro Kariya, Tokuji Kuronita
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Publication number: 20060097077Abstract: In a fuel injection nozzle including multiple nozzle hole groups each having multiple solitary nozzle holes, a group distance C between two of the nozzle hole groups is 0.8 or more times larger than an in-group hole distance ? in a nozzle hole group. The group distance C is the minimum interval of inter-group intervals that are formed between (i) peripheral boundaries of solitary nozzle holes belonging to a first nozzle hole group and (ii) peripheral boundaries of solitary nozzle holes belonging to a second nozzle hole group adjacent to the first nozzle hole group. The in-group hole distance ? is the minimum of intervals between peripheral boundaries belonging to each nozzle hole group.Type: ApplicationFiled: November 4, 2005Publication date: May 11, 2006Applicant: Denso CorporationInventors: Tokuji Kuronita, Satoru Sasaki, Kanehito Nakamura, Masumi Kinugawa
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Publication number: 20050092286Abstract: A compression ignition engine injects fuel through injection holes of an injector at a substantially constant injection rate to atomize the fuel so that the fuel can be easily vaporized and to make the fuel penetrate an atmosphere inside a cylinder. A spatial distribution of the injected fuel in which mixing of the fuel and air is promoted as the fuel recedes from the injection hole and the fuel reaches a premixing space where the fuel is premixed with the air is provided. The engine controls oxygen concentration inside the cylinder and an ignition delay so that a ratio of a quantity of the fuel injected before a start of ignition to a total fuel injection quantity falls within a range from 25% to 50% and so that the premixed gas formed in the premixing space is combusted serially.Type: ApplicationFiled: November 3, 2004Publication date: May 5, 2005Applicant: DENSO CORPORATIONInventors: Satoru Sasaki, Tsukasa Kuboshima, Kanehito Nakamura, Masumi Kinugawa, Yasuhiro Kariya, Tokuji Kuronita