Abstract: A control apparatus for an engine includes a crank angle sensor and a processor. The processor acquires a first crank angular velocity difference which is a change in a crank angular velocity in a first region. The first region includes a rotational change correlated with an engine torque output. The processor acquires a second crank angular velocity difference which is a change in the crank angular velocity in a second region. The second region includes a rotational change correlated with a combustion rate attributable to an air-fuel ratio. In a case where the first crank angular velocity difference is less than or equal to a first threshold and the second crank angular velocity difference is less than or equal to a second threshold, the processor performs an increase correction on a fuel amount to be supplied to the engine.

Abstract: Methods and systems to determine a presence or absence of engine misfire or spark plug fouling are presented. In one example, rates of change in engine speed are arranged in engine data blocks and root mean square values for the rates of change in engine speed are determined. The presence or absence of engine misfire or spark plug fouling may be based at least in part on the root mean square values.

Abstract: A method for protecting a dual mass flywheel DMF, by detecting, when the engine in running, that the DMF is entering into resonance, the DMF being arranged between an internal combustion engine and a gearbox of a vehicle, comprising the following steps: • Determining the average rotational speed (Vvilmoy) of the crankshaft, over time, over a predetermined given period, as a first parameter constituting a risk of the DMF entering into resonance, • Measuring the maximum instantaneous rotational speed and the minimum instantaneous rotational speed of the crankshaft, the difference defining the maximum amplitude (AmpVvil) of the rotational oscillations of the crankshaft, over the period, as a second parameter constituting a risk of the DMF entering into resonance, • Detecting when the DMF is entering into resonance from a determined combination of values of the first and second parameters, over the period, • limiting or cutting off the fuel injection in the cylinders after said detection.

Abstract: A method and device for short circuit monitoring of a three-phase load connected to a three-phase grid, to improve short circuit monitoring of a three-phase load, the device having at least one current sensor arranged in the current path of one phase of the three-phase grid, and a processing unit for evaluating the measurement values of the at least one current sensor, having a respective port for each current sensor, to which the respective current sensor is connected via a connecting line. The processing unit is configured to detect a short circuit on the three-phase load through evaluation of the measurement values determined by the current sensor. The evaluation includes a plausibility check of the determined measurement values in order to distinguish between a short circuit and an influence on the determined measurement values by electrical and/or electromagnetic interference.

Abstract: An object is to provide a misfire detection device and a vehicle with an enhanced detection reliability. A misfire detection device includes: a rotation speed acquisition unit configured to acquire a rotation speed of a rotator rotated by a four-stroke engine; a misfire determination unit configured to determine the presence or absence of a misfire in the four-stroke engine based on the rotation speed of the rotator acquired by the rotation speed acquisition unit; and a periodic fluctuation detection unit configured to detect a periodic fluctuation contained in a rotation fluctuation of the four-stroke engine based on a rotation speed acquired by the rotation speed acquisition unit, the periodic fluctuation being repeated on a circulation cycle of at least one element of a wrapping transmission element or a plurality of transmission wheels, the periodic fluctuation having a plurality of extreme values within the circulation cycle of the one element.

Abstract: Using machine learning for misfire detection in a Dynamic firing level modulation controlled internal combustion engine is described. A neural network is used to calculate expected crank acceleration from various inputs, including the dynamically defined cylinder skip fire sequence. The output of the neural network is then compared to a signal indicative of the measured crank acceleration. Based the comparison, a prediction is made if a misfire has occurred or not. In alternative embodiment, the neural network is expanded to include the measured crank acceleration as an additional input. With the latter embodiment, the neural network is arranged to directly predict misfire events.

Abstract: An electronic device includes a first sensor, a second sensor, and a controller configured to determine whether the electronic device is in a predetermined state based on a detection result of the first sensor. The controller is configured to, if it is determined that the electronic device is in the predetermined state, refrain from changing a correction value used to correct a detection error in the second sensor.

Abstract: A misfire determination device of an internal combustion engine, includes an angular velocity obtaining section which obtains two crank angular velocities corresponding to two crank angular positions, respectively, which are set between a range which is around a first compression top dead center and a range which is around a second compression top dead center, in which the first compression top dead center is a compression top dead center of a determination target cylinder, and the second compression top dead center is the compression top dead center of a next ignition cylinder in which ignition is performed next to the ignition performed in the determination target cylinder; and a misfire determination section which determines whether or not misfire has occurred in the determination target cylinder based on a result of comparing a deviation between the two crank angular velocities to a predetermined misfire determination threshold.

Abstract: A misfire detecting apparatus for an internal combustion engine is provided. The engine has an output shaft connected via a torsion element to an input shaft of a transmission mechanism. A transmission rotational speed parameter indicative of a rotational speed of the input shaft is detected. A modified engine rotational speed parameter is calculated by modifying the detected engine rotational speed parameter based on the transmission rotational speed parameter, an engine rotation moment on the input side of the torsion element, and a transmission rotation moment on the output side of the torsion element. An average change amount of the modified rotational speed parameter, and an inertia speed changing component, are calculated. Further, a corrected rotational speed parameter is calculated by correcting the modified rotational speed parameter according to the average change amount and the inertia speed changing component.

Abstract: The present invention relates to a control device and a control method for an internal combustion engine equipped with a variable compression ratio mechanism. The control device sets an air charging efficiency as an engine load equivalent value and performs setting of a determination value used for misfire diagnosis, setting of an ignition timing, an estimation of a catalyst temperature, or the like. In the control device, when a compression ratio is higher than the basic compression ratio, and the theoretical thermal efficiency is high, the air charging efficiency is corrected to be increased, to perform the control on the basis of the corrected air charging efficiency. Furthermore, in a torque control that sets a target air charging efficiency on the basis of a torque command value, when the compression ratio is higher than the basic compression ratio, the target air charging efficiency is reduced.

Abstract: At every ignition cycle, when a duration change amount ?T30[i] is equal to or less than a reference value ?T30ref2, a misfire counter Cmf is kept unchanged. When the duration change amount ?T30[i] is greater than the reference value ?T30ref2, on the other hand, the misfire counter Cmf is incremented by value 1. A misfire ratio Rmf is set to provide a smaller value when an amount increasing determination flag F[i] is equal to value 1 than a value when the amount increasing determination flag F[i] is equal to value 0. In the case where an ignition counter Ci reaches or exceeds a reference value Ciref, it is determined whether a conversion catalyst is overheated by comparison between the misfire counter Cmf and an accumulated misfire ratio Rmfsum that is an accumulated value of the misfire ratio Rmf.

Abstract: A first target wheel has an opening and rotates about an axis of rotation to move the opening along a generally circular path. A second target wheel adjacent the first target wheel has a second projection projecting into the opening of the first target wheel with the second projection being movable along the generally circular path. A single sensor is positioned adjacent the generally circular path and senses movement of the opening and the second projection past the sensor. An electronic controller may be used to process signals from the sensor to determine the relative angular difference between the first target wheel and the second target wheel.

Abstract: In a method for determining, whether a crankshaft of a combustion engine rotating forward after a reverse rotation is oscillating or continues the forward movement, when noticing a reverse rotation of the crankshaft, the covered rotational angle during a reverse rotation is detected, an actual threshold is computed by adding the covered rotational angle and a predetermined safety distance. The rotational angle of the crankshaft rotating immediately forward after a reverse rotation is compared to the actual threshold.

Abstract: At a procedure for determining at least one misfiring cylinder (1, 2, 3, 4) of a combustion engine (12) with an even number n of at least four cylinders (1, 2, 3, 4), whereby at least each cylinder (1, 2, 3, 4) is assigned to its own angle segment of a work cycle of the combustion engine (12) and whereby uneven running values (luts) are determined for each cylinder (1, 2, 3, 4), the uneven running values (luts) are evaluated with regard to the fulfillment of a condition (1., 2., 3., 4.), which is set depending on the length of the angle segment or a part or a multiple of it and which corresponds with a default misfiring pattern of the combustion engine (12).

Abstract: Structured with a rotational fluctuation measuring section 51 measuring a rotational fluctuation amount DTdi, a misfire judging section 55 judging a misfire by comparing the rotational fluctuation amount with a judging threshold value, a low load judging section 56 judging an internal combustion engine operating under a low load condition, and an ignition angle judging section 57 judging an ignition angle exceeding an ignition delay angle, wherein the misfire judging section 55 has a map M1 with judging threshold values th1 with respect to rotational speeds ne of the engine and a map M2 with judging threshold values th2 with rotational fluctuation amounts larger than the map M1, and judges the misfire based on the maps M1 and M2 when the engine is operating under the low load condition with the ignition angle exceeding the ignition delay angle and, in other cases, based only on the map M1.

Abstract: An engine misfire diagnostic apparatus measures an amount of time required for a crankshaft to pass through a prescribed crank angle range corresponding to a combustion stroke to obtain time measurement values on a per cylinder basis. A first misfire parameter is obtained based on stored time measurement values from a designated cylinder, an opposing cylinder corresponding to one crankshaft rotation prior and the opposing cylinder corresponding to one crankshaft rotation later. A second misfire parameter is obtained based on stored time measurement values from the designated cylinder, a first reference cylinder whose ignition occurs one ignition prior to the designated cylinder's ignition and a second reference cylinder whose ignition occurs later than the designated cylinder's ignition, the differences weighted according to a prescribed ratio. A determination of whether the designated cylinder has misfired is based on the second misfire parameter and a derivative value of the first misfire parameter.

Abstract: A device and its method of use for in situ detection of bent and/or broken teeth on a vehicle engine pulse generator plate. The device includes a pair of detection sensors adapted to detect pulse generator plate teeth during rotation of a pulse generator plate, and a controller in communication with the sensors. The sensors are arranged such that one sensor leads the other with respect to the detection of teeth on a rotating pulse generator plate. Rotation of a pulse generator plate in the presence of the sensors will cause the sensors to produce an output signal each time a tooth passes by. The signals from the sensors form associated pulse trains that are evaluated by a microprocessor device and associated program of the controller to determine if the pulse generator plate has any bent and/or broken teeth.

Abstract: A combustion state detection apparatus includes an ion detection device that detects ions generated in a combustion chamber, an end detection device that detects ion signal end timing after spark timing obtained from the ion detection device, and a combustion diagnosis device that sets comparative timing to be compared with the end timing to determine abnormal combustion when the end timing is advanced from the comparative timing. The diagnosis device sets a smoothed value smoothed using various ion signal end timing values to set a ratio of the smoothed value and the spark timing and sets the comparative timing by making the ratio variable at predetermined timing with respect to the smoothed value. Hence, abnormal combustion in the internal combustion engine can be detected without causing a change in detection accuracy even with a change in calibration or environment and matching man hours for abnormal combustion detection can be reduced.

Abstract: In a method for detecting combustion misses in cylinders of a combustion engine in part-engine operation in which only some of the cylinders are operated by the injection of fuel, a positional angle of the crankshaft is assigned to an angle segment; each angle segment is assigned to the particular cylinder which predominantly provides the torque for moving the crankshaft through the angle segment; an irregular running datum is determined as a function of a difference of segment pass-through times of immediately successive angle segments; and a combustion miss is detected if the irregular running datum exceeds or undershoots a limit value. In part-engine operation, the irregular running datum is determined only for two successive angle segments that are assigned to a combusting cylinder and to a non-combusting cylinder.

Abstract: The engine misfire detection process of the invention sets a first threshold value and second threshold values to be referred to for detection of an engine misfire and detects an engine misfire based on the settings of the first threshold value and the second threshold values and 360-degree differences. The engine misfire detection process of the invention detects the occurrence of an engine misfire at each gear position of the transmission by taking into account the varying effects of the operating conditions of a motor the transmission, and a planetary gear mechanism on the crankshaft of the engine.

Abstract: A misfire detection system monitors engine speed fluctuations in the engine rotation frequency domain and identifies misfire when a phase angle locks onto a stable value rather than fluctuating randomly. After misfire detection, the system also performs cylinder or cylinder pair identification using predefined phase angle regions, where the identification process incorporate knowledge of what phase angle region a locked phase angle falls within.

Abstract: An engine misfire diagnostic apparatus measures an amount of time required for a crankshaft (2) to pass through a prescribed crank angle range corresponding to a combustion stroke to obtain time measurement values on a per cylinder basis. A first misfire parameter (MISB) is obtained based on stored time measurement values from a designated cylinder, an opposing cylinder corresponding to one crankshaft rotation prior and the opposing cylinder corresponding to one crankshaft rotation later. A second misfire parameter (MISA) is obtained based on stored time measurement values from the designated cylinder, a first reference cylinder whose ignition occurs one ignition prior to the designated cylinder's ignition and a second reference cylinder whose ignition occurs later than the designated cylinder's ignition, the differences weighted according to a prescribed ratio.

Abstract: A method for the determination of combustion misfires in an internal combustion engine having a plurality of cylinders, there being provision, for determining at least two successive compression times and expansion times for at least one cylinder of the internal combustion engine, for the determination of combustion misfires a comparison of the change in the compression times with the change in the expansion times being carried out, and the result of the comparison being a measure of a combustion misfire.

Abstract: In the case of non-execution of catalyst warm-up acceleration control, the engine misfire detection procedure compares a 30-degree rotation time computed as a time required for a 30-degree rotation of an engine crankshaft with preset reference values Tref1 and Tref2 and distinctly detects the occurrence of intermittent engine misfires and the occurrence of either a single engine misfire or consecutive engine misfires (steps S120 to S150). In the case of execution of the catalyst warm-up acceleration control, the engine misfire detection procedure compares the 30-degree rotation time computed as the time required for a 30-degree rotation of the engine crankshaft with preset reference values Tref3 and Tref4 and distinctly detects the occurrence of the consecutive engine misfires and the occurrence of either the single engine misfire or the intermittent engine misfires (steps S160 to S190).

Abstract: The engine misfire detection apparatus of the invention successively determines whether a rotational fluctuation difference Nxd360 as a difference between a rotational fluctuation Nxd at a certain crank angle CA of an engine and a rotational fluctuation Nxd at a 360 degree-prior crank angle CA exceeds a predetermined reference value A1 (step S150) and whether a rotational fluctuation difference Nxd720 as a difference between the rotational fluctuation Nxd at the certain crank angle CA and a rotational fluctuation Nxd at a 720 degree-prior crank angle CA exceeds a predetermined reference value B1 (step S160).

Abstract: At the setting of a gearshift position to a D position or a P position (step S130) where damping control is performed with motors MG1 and MG2 to reduce the vibration of an engine 22, the procedure adopts threshold values A1, B1, and C1 for detection of an engine misfire (step S180). At the setting of the gearshift position to an N position where the damping control is not performed, the procedure adopts threshold values A2, B2, and C2, which are greater than the threshold values A1, B1, and C1, for detection of an engine misfire (step S210). The threshold values used for engine misfire detection are thus changed over according to the execution or non-execution of the damping control. This arrangement enables engine misfire detection by a simple series of processing.