Patents by Inventor Takanori Fujimoto
Takanori Fujimoto 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: 4945485Abstract: An engine control method for a vehicle is disclosed in which operation of an engine is optimally controlled in an entire operating range thereof without causing any undesirable delay in control operation. To this end, operating conditions of the engine are sensed through the use of various sensors and control signals are calculated based on the sensed engine operating conditions in a plurality of steps through the use of a microcomputer so that the operation of the engine is optimized by the use of the control signals thus calculated. In one embodiment, a first step and a second step of the plurality of steps are alternately calculated and omitted every other time the control signals are calculated while an operating parameter of the engine operates in a specified operating range in which variations in the sensed operating conditions of the engine are limited.Type: GrantFiled: September 28, 1988Date of Patent: July 31, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Fujimoto, Toshiro Hara
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Patent number: 4932382Abstract: A fuel control system for an internal combustion engine for controlling fuel supply rate on the basis of the output signal of a vortex flowmeter having variable-frequency filter means, capable of accurately measuring intake air flow to control the fuel supply rate accurately avoiding the erroneous measurement of noises generated during the rapid deceleration of the engine in which the throttle valve is shut. The fuel supply system has operating mode detecting means for detecting the operating mode of the engine, and passband fixing means for fixing the passband of the variable-frequency filter means at a predetermined passband when the operating mode detecting means detects that the engine is in a predetermined deceleration mode.Type: GrantFiled: January 23, 1989Date of Patent: June 12, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Fujimoto, Toshiro Hara
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Patent number: 4930481Abstract: An engine control apparatus comprises a cylinder discrimination sensor for generating cylinder discrimination signal, a crank angle sensor for generating crank angle signal, a fuel injection valve provided in each cylinder of the engine, an ignition coil provided in correspondence to each and every cylinder, a flip-flop circuit for detecting a state of misfire in each cylinder on the basis of a state of signal of said ignition coil, and a micro-computer for receiving the cylinder discrimination signal, the crank angle signal and the output signal of the flip-flop circuit to detect that a state of misfiring has occured continuously at the same cylinder and for closing the fuel injection valve corresponding to the cylinder where the misfiring has occured.Type: GrantFiled: June 14, 1989Date of Patent: June 5, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Fujimoto, Toshirou Hara
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Patent number: 4928228Abstract: An engine control apparatus which is constructed with a cylinder discrimination sensor for generating cylinder discrimination signal, a crank angle sensor for generating crank angle signal, a fuel injection valve provided in each cylinder of the engine, an ignition coil provided in correspondence to each and every cylinder, a flip-flop which functions to reverse in synchronism with ignition timing, misfire detector for detecting the state of misfire in each cylinder, and an engine control section for controlling the fuel injection valve and the ignition coil in correspondence to each cylinder upon receipt of the cylinder discrimination signal and the crank angle signal and for closing the fuel injection valve of the misfired cylinder upon receipt of the misfire detection signal.Type: GrantFiled: May 20, 1988Date of Patent: May 22, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Fujimoto, Toshiro Hara
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Patent number: 4926807Abstract: An ignition signal distributing circuit for a multicyclinder engine in accordance with the present invention comprises a delay circuit which delays an output signal of a crank angle sensor or a cranking switch signal for the duration until the first output signal of the crank angle sensor is completed in the early stage of the time immediately after a starting of power supplying, and thereby an output of an error ignition signal can be prevented which is caused by that the crank angle sensor outputs a detection signal when power supplying is started.Type: GrantFiled: May 24, 1989Date of Patent: May 22, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Fujimoto, Toshirou Hara
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Patent number: 4911128Abstract: A fuel controller for an internal combustion engine has a Karman vortex air flow sensor for sensing the air flow rate into the air intake pipe of the engine and producing an electrical output signal having a frequency which is proportional to the air flow rate. A load sensor determines the air flow rate into an air intake pipe based on the output of the air flow sensor. A determining mechanism determines whether the output of the air flow sensor is reliable. A calculator calculates the actual air intake rate into the engine according to a first formula which employs the most recent output of the load sensor when the determining mechanism determines that the output of the air flow sensor is reliable, and it calculates the actual air intake rate according to a second formula which ignores the most recent output of the air flow sensor when the determining mechanism determines that the output of the air flow sensor is not reliable.Type: GrantFiled: February 1, 1989Date of Patent: March 27, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshiro Hara, Takanori Fujimoto
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Patent number: 4895127Abstract: An ignition timing control device for an internal combustion engine includes a load detector for detecting a load on the engine, an engine-revolution detector for detecting a number of revolution of the engine, a cylinder discrimination signal generator for generating cylinder discrimination signals, an operating device for operating the optimum ignition timing for the engine based on the outputs from the load detector and the engine-revolution detector, a drive signal generator for generating drive signals corresponding to the ignition timing for each of the ignition coils provided in each cylinder, and a distributor for distributing the drive signal to each of the ignition coils in an appropriate sequence on the basis of the cylinder discrimination signal. The distributor is provided with a distribution sequence maintaining device for maintaining the distribution sequence of the drive signal, even when the cylinder discrimination signal is stopped.Type: GrantFiled: May 11, 1988Date of Patent: January 23, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshiro Hara, Takanori Fujimoto, Masahira Akasu
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Patent number: 4875452Abstract: A fuel control apparatus for an internal combustion engine comprises an crank angle sensor producing a crank angle signal at a predetermined crank angle in the engine, an intake air quantity detector for detecting the quantity of intake air sucked in the engine, an injector for injecting fuel to an engine cylinder, and a control means for actuating the injector at a driving time in response to the quantity of intake air and at a timing determined by the crank angle signal, wherein a period calculating means calculates the next period on the basis of the previous period and the present period in the crank angle signal and an injection-initiating time control means controls a time to actuate the injector in accordance with the next period of the crank angle signal.Type: GrantFiled: June 30, 1988Date of Patent: October 24, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshiro Hara, Takanori Fujimoto, Ikuo Musa
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Patent number: 4856479Abstract: An output of a knocking discriminator is integrated by an integrator and the integrated value is reset by a resetting device in response to the operation in the ignition timing. The resetting operation of the resetting device is caused when both a cylinder pulse signal and an output signal from a micro-computer are inputted, and the resetting operation is cancelled when at least one of the signals disappears.Type: GrantFiled: May 20, 1988Date of Patent: August 15, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Fujimoto, Toshiro Hara, Satoshi Komurasaki
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Patent number: 4528970Abstract: Disclosed is an ignition device which can provide a good ignition timing characteristic over an engine speed range from low to high by using a first angular signal corresponding to a given crank position of an engine and a second angular signal corresponding to a crank position retarded by a given angle behind the generating position of the first angle signal.Type: GrantFiled: December 21, 1982Date of Patent: July 16, 1985Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Takanori Fujimoto
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Patent number: 4441478Abstract: A flywheel magneto generates a first and a second angular signal in synchronism with the rotation of an internal combustion engine so that the second signal is broader in pulse width than and delayed by a predetermined time interval relative to the first signal. An ignition time calculation circuit converts the first signal to a rectangular pulse. The second signal is partly bypassed to ground until the pulse is ended in the high and moderate speed ranges of the engine. At the end of the pulse, the second signal cause a thyristor to conduct so as to determine an ignition time. In the low speed range, the pulse is disabled and the second signal cause the thyristor to conduct upon its reaching the threshold voltage of the thyristor.Type: GrantFiled: January 25, 1983Date of Patent: April 10, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Takanori Fujimoto
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Patent number: 4412522Abstract: Disclosed is an ignition device which can provide a good ignition timing characteristic over an engine speed range from low to high by using a first angular signal corresponding to a given crank position of an engine and a second angular signal corresponding to a crank position retarded by a given angle behind the generating position of the first angle signal.Type: GrantFiled: February 22, 1982Date of Patent: November 1, 1983Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Takanori Fujimoto
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Patent number: 4404952Abstract: A magnet ignition device is provided with an angular position detecting device for producing a first angular signal with one polarity corresponding to an angular position of a given crankshaft of an engine and a second angular signal with the other polarity corresponding to an angular position of the crankshaft retarded by a given angle relative to the angular position where the first angular signal is generated. An ignition timing operation circuit is driven by the first angular signal. A signal representing advance angle information of the result of the operation by the operation circuit and the second angular signal are both applied to a switching element. In the circuit arrangement, only the second angular signal is used as an ignition signal in low rotational frequencies suffering from a great variation of the rotational frequency of the engine and, in high rotational frequencies higher than a given rotational frequency, only the advance angle signal is used as the ignition signal.Type: GrantFiled: December 18, 1981Date of Patent: September 20, 1983Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takanori Fujimoto, Yasuo Tada