| Patent application number | Description | Published |
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| 20090055084 | FUEL INJECTION CONTROL DEVICE - A fuel injection control device (ECU) for controlling injection supply of fuel to a target engine includes a program for sequentially sensing fuel pressure fluctuating with injection of a predetermined injector of each cylinder of a multi-cylinder engine based on an output of a fuel pressure sensor, a program for detecting a diagram as a profile of a transition of a fuel quantity injected from the injector per unit time (i.e., an injection rate) at a present time based on the sequentially sensed fuel pressure transition, and a program for varying an injection command to the injector based on the diagram that is the profile of the injection rate transition and that is detected by the latter program and a predetermined basic diagram such that the diagram as the actual profile of the injection rate transition belongs to the basic diagram. | 02-26-2009 |
| 20090056676 | FUEL INJECTION DEVICE AND FUEL INJECTION SYSTEM - A fuel injection device includes a fuel injection valve for injecting fuel, which is distributed from a pressure-accumulation vessel. A pressure sensor is located in a fuel passage, which extends from the pressure-accumulation vessel to a nozzle hole, and configured to detect pressure of the fuel. The pressure sensor is located closer to the nozzle hole than the pressure-accumulation vessel. A storage unit stores individual difference information, which indicates an injection characteristic of the fuel injection valve, the injection characteristic being obtained by an examination. The individual difference information is related to a fluctuation pattern of a portion of the fluctuation in detected pressure waveform of the pressure sensor. The fluctuation is attributed to one fuel injection through the nozzle hole. The portion of the fluctuation is subsequent to an end of the fuel injection. | 03-05-2009 |
| 20090056677 | FUEL INJECTION DEVICE, FUEL INJECTION SYSTEM, AND METHOD FOR DETERMINING MALFUNCTION OF THE SAME - A fuel injection device includes a fuel injection valve for injecting fuel, which is distributed from a pressure-accumulation vessel. A pressure sensor is located in a fuel passage, which extends from the pressure-accumulation vessel to a nozzle hole of the fuel injection valve. The pressure sensor is located closer to the nozzle hole than the pressure-accumulation vessel and configured to detect pressure of fuel. The fuel injection device further includes a storage unit for storing individual difference information, which indicates an injection characteristic of the fuel injection valve. The injection characteristic is obtained by an examination. The individual difference information indicates a relationship between an injection state when the fuel injection valve performs fuel injection and a fluctuation in detected pressure of the pressure sensor. The fluctuation is attributed to the fuel injection. | 03-05-2009 |
| 20090063010 | FUEL INJECTION CONTROL DEVICE - A fuel injection control device (ECU) for controlling injection supply of fuel to a target engine has a program for sequentially sensing fuel pressure fluctuating with injection of a predetermined injector a program for detecting an injection centroid of a diagram as a profile of a transition of an injection rate of the injector at a present time based on a transition of the sequentially sensed fuel pressure, and a program for varying an injection command (injection timing) of the injector based on the detected injection centroid and an injection centroid of a predetermined basic diagram such that a relative positional relationship between the injection centroids of the diagram as the actual profile of the injection rate transition and the basic diagram becomes a relationship, in which timings of the injection centroids are close to each other. | 03-05-2009 |
| 20090063011 | FUEL INJECTION DEVICE AND METHOD FOR EXAMINING THE SAME - A fuel injection device includes a fuel injection valve for injecting fuel. A pressure sensor is configured to output detection signal correspondingly to pressure of the fuel. The fuel injection device further includes a storage unit for storing individual difference information, which indicates an output characteristic of the detection signal. The output characteristic is obtained by an examination. The individual difference information indicates a relationship between change in test pressure and change in detection signal. The test pressure is actually applied to the pressure sensor in the examination. The change in detection signal is attributed to the change in test pressure. | 03-05-2009 |
| 20090063012 | FUEL INJECTION CONTROLLER FOR INTERNAL COMBUSTION ENGINE - A common rail type fuel injection system of an engine includes: a common rail for accumulating and holding high-pressure fuel; a fuel pump for pressure-feeding fuel to the common rail; and an injector for injecting the high-pressure fuel accumulated and held in the common rail. A pressure sensor is disposed in a fuel suction pod of the injector. An ECU sequentially detects a fuel pressure varied when the injector injects the fuel and sequentially detects a fuel pressure varied when the fuel pump pressure-feeds the fuel. When the injector injects the fuel the ECU computes injection pressure by the detection values of these pressures and computes injection characteristics by the injector on the basis of the injection pressure. | 03-05-2009 |
| 20090063013 | FUEL INJECTION CHARACTERISTIC SENSING DEVICE AND FUEL INJECTION COMMAND CORRECTING DEVICE - A fuel injection characteristic sensing device obtains an injection characteristic of a target injector (an injector of each cylinder of a multi-cylinder engine) at each time. The device has a program for sequentially sensing fuel pressure at a sensing point corresponding to a fuel pressure sensor, which is provided at a fuel inlet of each injector, based on an output of the fuel pressure sensor. The device has a program for detecting predetermined timings (injection timings such as an injection start timing and an injection end timing) in a series of operations concerning fuel injection of the injector of each cylinder based on the sequentially sensed fuel pressure. Thus, the injection characteristic at each time including a temporal characteristic change can be obtained. | 03-05-2009 |
| 20090063016 | INJECTION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE - A fuel injection control device (ECU) for controlling injection supply of fuel to an engine is applied to an injector that has a valve body formed with a fuel injection hole, a needle accommodated in the valve body for opening and closing the injection hole, and a piezoelectric element for driving the needle such that the needle reciprocates and that can continuously adjust an injection rate in accordance with an injection command signal to the piezoelectric element. The fuel injection control device senses a fuel pressure waveform indicating a transition of fuel pressure fluctuation accompanying a predetermined injection of the injector based on an output of a fuel pressure sensor and calculates an injection command signal for approximating a predetermined injection parameter concerning the predetermined injection to a reference value of the parameter based on the sensed fuel pressure waveform. | 03-05-2009 |
| 20090082940 | INTERNAL COMBUSTION ENGINE CONTROL DEVICE - A control device of an internal combustion engine calculates a rotation increase amount caused in connection with a small injection based on a sensing value of a crank angle sensor and calculates an actual torque increase amount based on the calculated rotation increase amount. The control device senses fuel pressure fluctuation caused in connection with the small injection with a pressure sensor and calculates an actual injection quantity based on the sensed fuel pressure fluctuation. Then, the control device calculates a combustion rate by comparing the actual torque increase amount and the actual injection quantity and changes data (an injection pattern) of an injection control map in accordance with the combustion rate to achieve desired output torque and emission state. | 03-26-2009 |
| 20090082941 | CONTROLLER FOR FUEL INJECTION SYSTEM - A fuel pressure sensor is provided to each fuel injector respectively and is disposed in a fuel passage between the accumulator and a fuel injection port of the fuel injector in such a manner as to be close to a fuel injection port relative to the accumulator. Output values of a plurality of fuel pressure sensors are acquired, and an average of the output values is computed. The output values are corrected in such a manner as to agree with the average. | 03-26-2009 |
| 20090084356 | CONTROLLER FOR ACCUMULATOR FUEL INJECTION SYSTEM - A common-rail fuel injection system is equipped with a common-rail, a fuel pump | 04-02-2009 |
| 20090084357 | FUEL-SUPPLY QUANTITY ESTIMATING APPARATUS AND FUEL INJECTION SYSTEM - A variation waveform of fuel pressure is obtained by use of a fuel pressure sensor which detects pressure of fuel supplied to an injector. A quantity of fuel supplied to the injector is estimated based on a waveform of the detected pressure that is greater than a reference value due to a fuel pumping, in the obtained variation waveform. Especially, in a case that the fuel pressure sensor is provided to each of a plurality of injectors, it is desirable to obtain the variation waveform based on the output of the fuel pressure sensor provided to a cylinder in which no fuel injection is currently performed. | 04-02-2009 |
| 20090088951 | DEFECTIVE INJECTION DETECTION DEVICE AND FUEL INJECTION SYSTEM HAVING THE SAME - A pressure sensor is located in a fuel passage, which extends from a pressure-accumulation vessel to a nozzle hole of a fuel injection valve. The pressure sensor is located closer to a nozzle hole than the pressure-accumulation vessel for detecting pressure fluctuated by injection of fuel through the nozzle hole. An instruction signal output unit outputs an injection instruction signal so as to instruct an injection mode of fuel to the fuel injection valve. A defective injection determination unit determines whether a detected pressure of the fuel pressure sensor is fluctuated in a fluctuation mode in a range assumed from the injection instruction signal. The defective injection determination unit determines that a defective injection occurs when determining that the detected pressure is out of the fluctuation mode in the assumed range. | 04-02-2009 |
| 20090107225 | CYLINDER CHARACTERISTIC VARIATION SENSING DEVICE - A cylinder characteristic variation sensing device has a small injection controlling section that performs small injections sequentially in respective cylinders, a torque increase amount sensing section that senses an increase amount of output torque caused in connection with the small injection for each cylinder, an injection quantity sensing section that senses an actual injection quantity of the small injection for each cylinder, and a cylinder characteristic variation calculating section that calculates a variation in a cylinder characteristic among the cylinders (i.e., a cylinder characteristic variation) based on a variation in the sensing value of the injection quantity sensing section among the cylinders (i.e., an injection quantity variation) and a variation in the sensing value of the torque increase amount sensing section among the cylinders (i.e. a torque increase amount variation). | 04-30-2009 |
| 20090107227 | EXHAUST GAS RECIRCULATION DISTRIBUTION VARIATION SENSING DEVICE - An exhaust gas recirculation distribution variation sensing device has a torque sensing section that senses instantaneous torque caused with combustion of fuel injected from an injector for each cylinder, an injection quantity sensing section that senses an actual injection quantity of the injected fuel for each cylinder and an exhaust gas recirculation distribution variation calculating section that calculates an exhaust gas recirculation distribution variation as a distribution variation of recirculated exhaust gas to respective cylinders based on a variation in the torque sensing value of the torque sensing section among the cylinders (i.e., a torque variation) and a variation in the injection quantity sensing value of the injection quantity sensing section among the cylinders (i.e., an injection quantity variation). | 04-30-2009 |
| 20090112444 | CONTROL DEVICE AND CONTROL SYSTEM OF INTERNAL COMBUSTION ENGINE - An internal combustion engine control device has a cylinder pressure sensor for sensing pressure in a combustion chamber and a fuel pressure sensor for sensing fuel pressure fluctuating in connection with fuel injection from an injector. The control device calculates a combustion characteristic of a cylinder (for example, an ignition delay or a combustion rate) based on both of a cylinder pressure sensing value and a fuel pressure sensing value. The control device corrects an EGR quantity, supercharging pressure, and injection start timing in accordance with the calculated combustion characteristic. Thus, the control device performs cooperative control of the injection start timing (an injection mode), the supercharging pressure and the EGR quantity (intake air conditions) in accordance with the combustion characteristic of the cylinder. | 04-30-2009 |
| 20090112447 | INTAKE AIR QUANTITY CORRECTING DEVICE - An intake air quantity correcting device calculates an intake air quantity as a sensing target of an airflow meter (an intake air quantity sensor) based on an injection quantity sensing value sensed with a fuel pressure sensor (an injection quantity sensor) and an oxygen concentration sensing value sensed with an A/F sensor (an oxygen concentration sensor). The intake air quantity correcting device regards a difference between the intake air quantity calculation value calculated in this way and an intake air quantity sensing value sensed with the airflow meter as a sensing error of the airflow meter and corrects the intake air quantity sensing value of the airflow meter based on the sensing error. | 04-30-2009 |
| 20090319157 | LEARNING DEVICE AND FUEL INJECTION SYSTEM - A learning device changes each of multiple parameters to an increased side and to a decreased side with respect to a reference value set for each of the multiple parameters. The learning device calculates an approximation degree for each combination of the changes of the multiple parameters. The learning device performs update by using the combination of the changes providing the highest approximation degree among the approximation degrees as the combination of the updated reference values when an update end condition is not satisfied. The update end condition is a condition that the approximation degree at the reference values is higher than any of the approximation degrees after the change. The learning device decides the reference values as learning values of the multiple parameters when the update end condition is satisfied. | 12-24-2009 |
| 20100250095 | FUEL INJECTION DETECTING DEVICE - A fuel injection detecting device computes a maximum-fuel-injection-rate-reach timing and a fuel-injection-rate-decrease-start timing based on a falling waveform of the fuel pressure and a rising waveform of the fuel pressure. The falling waveform represents the fuel pressure detected by a fuel sensor during a period in which the fuel pressure increases due to a fuel injection rate decrease. The rising waveform represents the fuel pressure detected by the fuel sensor during a period in which the fuel pressure decreases due to a fuel injection rate increase. The rising waveform and the falling waveform are respectively modeled by modeling function. In a case of small fuel injection quantity, an intersection timing at which lines expressed by the modeling functions intersect with each other is defined as the maximum-fuel-injection-rate-reach timing and the fuel-injection-rate-decrease-start timing. | 09-30-2010 |
| 20100250096 | FUEL INJECTION DETECTING DEVICE - A fuel injection detecting device computes an actual fuel-injection-start timing based on a falling waveform of the fuel pressure detected by a fuel sensor during a period in which the fuel pressure decreases due to a fuel injection rate increase. The falling waveform is modeled by a modeling formula. A reference pressure is substituted into the modeling formula, whereby a timing is obtained as the fuel-injection-start timing. | 09-30-2010 |
| 20100250097 | FUEL INJECTION DETECTING DEVICE - An actual maximum fuel injection rate is computed based on a falling waveform and a rising waveform of the fuel pressure. The falling waveform represents the fuel pressure detected by a fuel sensor during a period in which the fuel pressure increases due to a fuel injection rate decrease. The rising waveform represents the fuel pressure detected by the fuel sensor during a period in which the fuel pressure decreases due to a fuel injection rate increase. The falling waveform and the rising waveform are modeled by modeling functions. A reference pressure is computed based on pressure during a specified time period before the falling waveform is generated. An intersection pressure is computed, at which the straight lines expressed by the modeling functions intersect to each other. The maximum fuel injection rate is computed based on a fuel pressure drop from the reference pressure to the intersection pressure. | 09-30-2010 |
| 20100307457 | FUEL INJECTION CONTROLLER - A fuel injection controller includes an ECU controlling an operation of a fuel injector based on a characteristic data of the fuel injector, an EEPROM provided to the injector, and an EEPROM provided to the ECU. Identification information by which the fuel injector is individually identified is stored in both of the EEPROMs. It is determined whether the identification information stored in the injector-side EEPROM is identical to the identification information stored in the ECU-side EEPROM. Based on this determination result, it can be determined whether the injector and/or the ECU are exchanged to new one. | 12-09-2010 |
| 20100319443 | FUEL TEMPERATURE SENSING DEVICE - A fuel temperature sensing device has fuel temperature sensors provided to respective cylinders for sensing fuel temperature. Each fuel temperature sensor is arranged in a position closer to an injection hole than to a pressure accumulator in a fuel passage extending from the pressure accumulator to the injection hole. The device has an average value calculating section for calculating an average value of fuel temperature sensing values sensed with the fuel temperature sensors of the respective cylinders. The device has a deviation calculating section for calculating deviations between the average value and the fuel temperature sensing values of the respective fuel temperature sensors. The device has a correcting section for correcting the fuel temperature sensing value of each fuel temperature sensor to approximate the deviation to zero for each fuel temperature sensor. | 12-23-2010 |
| 20100324702 | LEARNING DEVICE - A learning device learns a control parameter (e.g., injection start response delay), which is used for deciding a control content of an injector (controlled object), in relation to a criterion variable (e.g., fuel pressure). The learning device has a storing section for storing a learning vector consisting of the control parameter and the criterion variable. The learning device has a measurement vector obtaining section for obtaining a measurement vector consisting of a measurement value of the control parameter and a measurement value of the criterion variable. The learning device has a correcting section for correcting the learning vector based on the measurement vector and for performing storing and updating of the learning vector in the storing section. | 12-23-2010 |
| 20100324803 | DATA STORAGE DEVICE - Data indicating a sudden change in a bulk modulus of fuel and data indicating a usage state and a usage environment of an injector as of occurrence of an injection abnormality are stored in EEPROM mounted in the injector. Thus, it can be analyzed whether a cause of a defect such as the injection abnormality is use of inferior fuel based on the data related to the bulk modulus. In addition, it can be analyzed whether the cause of the defect such as the injection abnormality is a severe usage state and a severe usage environment based on the data related to the usage state and the usage environment. Thus, the data useful for analyzing the cause of the defect related to the fuel injection can be provided. | 12-23-2010 |
