Patent application number | Description | Published |
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 |
20100250102 | FUEL INJECTION DETECTING DEVICE - A fuel injection detecting device computes an actual fuel-injection-end timing based on a rising waveform of 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 is modeled by a modeling formula. A reference pressure Ps(n) is substituted into the modeling formula, whereby a timing “te” is obtained as the fuel-injection-end timing. | 09-30-2010 |
20100319445 | FUEL STATE SENSING DEVICE - A fuel state sensing device is applied to an injector injecting fuel, which is supplied from a fuel pump, though an injection hole. The fuel state sensing device has a fuel pressure sensor (bulk modulus sensing section) for sensing a bulk modulus of the fuel existing in a fuel passage extending from a discharge port of the fuel pump to the injection hole. The fuel state sensing device has a fuel temperature sensor (fuel temperature sensing section) for sensing fuel temperature. The fuel state sensing device has an air mixing state calculating section for calculating a quantity or a ratio of air mixing in the fuel as an air mixing quantity or an air mixing ratio based on the sensed bulk modulus and the sensed fuel temperature. | 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 |
20110308497 | Fuel-Pressure Waveform Detector - A fuel-pressure waveform detector has a detect-waveform obtaining unit for obtaining a multi-stage injection pressure waveform by means of a fuel-pressure sensor while performing a multi-stage fuel injection during one combustion cycle. A model waveform memory stores a reference model pressure waveform of when a single fuel injection is performed. A waveform extracting unit extracts a pressure waveform due to the subject fuel injection by subtracting the reference model pressure waveform from the multi-stage injection pressure waveform. A correction unit corrects the reference model pressure waveform in such a manner that its attenuation degree becomes larger as a fuel injection period of the subject fuel injection is longer. | 12-22-2011 |
20120145805 | FUEL INJECTION CONTROL DEVICE - A waveform detector detects a variation in fuel pressure based on a detection value of a fuel pressure sensor as a fuel pressure waveform. A determining portion determines whether an interval between injections is zero or smaller than a predetermined value based on the detected fuel pressure waveform when multi-step-injection is performed. A correcting portion corrects an injection command signal indicative of an injection start timing and an injection end timing corresponding to a target injection state in a manner that the interval is increased when the interval is determined to be zero or smaller than the predetermined value. | 06-14-2012 |
20120150774 | CONTROL APPARATUS - A control apparatus includes a learning portion which learns a control parameter by correcting a learning vector consisting of a plurality of variables and a control parameter based on a measurement vector. The control apparatus further includes an interpolation portion which computes the control parameter corresponding to current variables which represent a current environmental condition by interpolating the control parameter learned by the learning portion. The interpolation portion includes a selecting portion which selects three learning vectors from a plurality of learning vectors, and which computes the control parameter corresponding to the current variables by interpolating the control parameters on a flat surface including the selected three learning vectors. | 06-14-2012 |
20120253639 | APPARATUS OF ESTIMATING FUEL STATE - An apparatus extracts a main waveform component and a branch waveform component from a pressure waveform detected by a fuel pressure sensor. The main waveform component is caused by pressure change traveling in a main passage. The branch waveform component is caused by pressure change traveling in a branch passage. The apparatus calculates traveling speeds based on the components. Then, the apparatus estimates a main passage temperature based on a detected value of the fuel temperature sensor, the traveling speeds, the fuel pressure waveform and an average pressure. | 10-04-2012 |
20130054120 | FUEL INJECTION CONTROLLER - A fuel injection controller includes an output detecting portion detecting a first output generated by a combustion of a fuel which a sensor-injector injects and a second output generated by a combustion of a fuel which the second fuel injector injects, a first injection quantity computing portion computing, based on a detection value of the fuel pressure sensor, a first injection quantity injected by the sensor-injector injector to generate the first output, and a second injection quantity estimating portion estimating a second injection quantity injected by the second fuel injector to generate the second output, based on the first output, the second output and the first injection quantity. | 02-28-2013 |