Abstract: A method and a device for controlling knocking in an internal combustion engine. A knock signal of a cylinder of the internal combustion engine is measured by a knock sensor and from that, a knock feature is generated. The knock feature is compared to a reference level in order to classify a combustion as a knocking or non-knocking combustion. The reference level is formed in consideration of a plurality of corrected knock features, the corrected knock features being formed from the knock features by determining map values from a program map as a function of operating parameters of the internal combustion engine and linking them additively, or by carrying out a low-pass filtering, or by determining map values from a program map as a function of operating parameters of the internal combustion engine and linking them additively and carrying out a low-pass filtering.

Abstract: An ECU outputs an ignition signal Si to an ignition apparatus through an ignition communication line. The ignition apparatus performs the closing operation of an ignition switching element, in a period during which the ignition signal Si is input. The ECU outputs a discharge waveform control signal Sc to a waveform control communication line, at a timing that is delayed by a predetermined delay time relative to an output timing of the ignition signal Si. In an input period of the discharge waveform control signal Sc after the stop of the input of the ignition signal Si, the ignition apparatus controls the electric current to flow through a primary coil, to a discharge current command value that is decided depending on the above delay time, by the opening-closing operation of a control switching element.

Abstract: A knocking control system for a gas engine of the present invention, being configured to calculate a knocking occurrence ratio (SEV) which is a ratio of a cycle number of cycles in which a predetermined knocking occurs for a period of the cycles of the predetermined cycle number, to the predetermined cycle number, decide a target value of an ignition timing of the ignition device based on a deviation (?SEV) between an occurrence ratio delay calculation value (SEVAVE) obtained by performing delay calculation of the knocking occurrence ratio and a predetermined occurrence ratio target value (SEVSET), and drive the ignition device so that the ignition timing reaches a command value (IGN) decided according to the target value.

Abstract: A control system for a vehicle is provided. The control system includes a signal processing module that receives a sensor signal and extracts a plurality of sample points from the sensor signal. A computation module computes a summation of the sample points, computes a summation of squares of the sample points, and computes a standard deviation based on the summation of the sample points and the summation of the squares of the sample points. A control module generates a control signal based on the sensor signal and the standard deviation.

Abstract: Methods and systems are provided for addressing cylinder-to-cylinder imbalances in the incidence of pre-ignition and/or knock. Engine cylinders are fueled based on each cylinder's pre-ignition count to balance the incidence of pre-ignition in each cylinder. The fueling is adjusted to maintain engine exhaust at stoichiometry.

Abstract: Methods and systems are provided for addressing cylinder-to-cylinder imbalances in the incidence of pre-ignition and/or knock. Engine cylinders are fueled based on each cylinder's pre-ignition count to balance the incidence of pre-ignition in each cylinder. The fueling is adjusted to maintain engine exhaust at stoichiometry.

Abstract: In a knock sensor signal processing apparatus, a first apparatus which receives an engine knock sensor signal performs A/D conversions of the signal with a predetermined period and transmits successive pluralities of A/D values in parallel, by serial data communication, to a second apparatus in response to respective commands received from the second apparatus. The number of communication lines provided for transmitting the A/D values is made greater than those for transmitting commands from the second apparatus to the first apparatus, so that a high A/D conversion frequency together with low data rate of transmitting the A/D values can be achieved, thereby reducing communication-generated noise.

Abstract: An engine ECU executes a program including a step of calculating intensity values LOG(V), a step of detecting vibration waveforms, a step of calculating a correlation coefficient K based on vibration waveforms, a step of preparing frequency distribution of intensity values LOG(V) smaller than a threshold V(1) and intensity values LOG(V) in an ignition cycle where correlation coefficient K is larger than a threshold K(1), a step of calculating a knock determination level V(KD) based on a median V(50) and a standard deviation ? of intensity values LOG(V), and a step of counting the number of intensity values LOG(V) larger than knock determination level V(KD) as the number of times that knocking has occurred.

Abstract: The present invention creates a method and an apparatus for blanking out interfering noise in connection with detecting knocking in an internal combustion engine. The following functions are performed: Forming a sensor signal integral value (KI) during a measurement time slot (MF) of the sensor signal of a knocking sensor; forming a correction value (DKI) for the sensor signal integral value (KI) corresponding to an interfering noise during the measurement time slot (MF); and subtracting the correction value (DKI) from the sensor signal integral value (KI) for forming a corrected sensor signal integral value (KI?) with the interfering noise blanked out.

Abstract: Under engine operating conditions in which a default setting for a knock determination period overlaps with a fuel injection period during which fuel is injected by a fuel injector, the fuel injection timing and the knock determination period are set in correlation with each other such that the knock determination period is shorter than its default setting so the fuel injection period and the knock determination period no longer overlap. Accordingly, it is possible to avoid a case in which noise produced by operation of the fuel injector rides on an output signal from a knock sensor during the knock determination period, and thus inhibit a decrease in accuracy of the knock determination due to that noise.

Abstract: The method for knock detection includes establishing that knock is occurring in the internal combustion engine when the amplified knock signal exceeds a predetermined reference level in a predetermined manner. The reference level is determined on the basis of individual cylinders and the increase in the reference level is limited when a new reference level leaves a predetermined reference level range or the gradient of the sound increase exceeds a predetermined threshold value. For determination of the reference level range and/or the threshold for the gradient average values of the signals originating from the sound of other cylinders are considered.

Abstract: A method of operating a knock detection system of a multi-cylinder piston engine in which the knock detection system comprises a sensor arranged in connection with each cylinder and a measurement circuit connected to the sensor includes running the engine at a load being less than full load and setting the output signal of each separate sensor between certain preset limits by adjusting one or more adjustment variables of the measurement circuit. The values of the adjustment variables for each separate cylinder are stored in the detection system. During normal use, the engine is run and the previously stored values of the adjustment values for each cylinder are used in the knock detection system.

Abstract: Method for processing a sensor signal of a knocking sensor for an internal combustion engine, having the following steps: a time window is defined for the evaluation of the sensor signal as a function of the operating state and/or the operating behavior of the internal combustion engine, a plurality of sampled values of the sensor signal are sampled within the predefined time window with a predefined sampling frequency, and an output signal which represents the knocking behavior of the internal combustion engine is determined from the sampled values, the Fourier transform of the sampled values being calculated in order to determine the output signal.

Abstract: A knocking detecting device executes A/D conversion of a knock sensor signal every constant time ts and executes filter processing of the converted digital signal. The knocking detecting device determines whether the knocking arises or not according to the filter processed data. The device measures a TDC signal falling period T every 120° CA. The period indicating of 5° CA is divided by a constant period ts to obtain a value which is rounded off to derive an integer N. At a timing in which the crankshaft rotates to 10° CA from the TDC signal falling, the filter processed data which are derived every A/D timing ts are integrated every N pieces of data. When the number of integrated value reaches 12, knocking determining process is executed based on the 12 integrated values.

Abstract: A method for processing knock-related data reduces the memory locations required for the method and also simplify the processing steps needed to determine a sum, average, and threshold value relating to magnitudes of knock ratios. Inputs from either pressure sensor or accelerometers are filtered and then used to form a ratio between a knock portion of a curve and a reference portion. Sequential magnitudes of the knock ratio are received and analyzed in a manner that reduces required memory locations and improves processing speed.

Abstract: The decision period in which an output of a knock sensor is extracted is set by a setting unit in response to an output of a crank angle sensor. The set decision period is stored in a storing unit and is changed by a changing unit 14 to contain the output of the knocking in response to an output of a processing circuit. In addition, the processing circuit corrects the decision period stored in the storing unit to reduce a difference between the changed decision period and the decision period stored in the storing unit. According to this, since the decision period can be corrected to contain the sensed output of the knocking in response to the variation of the knocking occurring timing, the knocking sensing precision can be improved.

Abstract: The detection output of a knock sensor, which detects knock of an internal combustion engine, is filtered by a filter in which the filtering frequency band is variable. The output of the filter is discriminated by a level discriminating unit with respect to a given determination level. A counter counts number c of times at which the detection output of the knock sensor is equal to or higher than the determination level. A determining unit determines whether knock occurs or not on the basis of the number c. In response to the output of the determining unit, when determination of occurrence of knock is impossible, a correcting unit conducts correction of shifting the filtering frequency band of the filter. Therefore, determination of occurrence of knock is enabled, and the accuracy of knock detection is improved.

Abstract: The decision period in which an output of a knock sensor is extracted is set by a setting unit in response to an output of a crank angle sensor. The set decision period is stored in a storing unit and is changed by a changing unit 14 to contain the output of the knocking in response to an output of a processing circuit. In addition, the processing circuit corrects the decision period stored in the storing unit to reduce a difference between the changed decision period and the decision period stored in the storing unit. According to this, since the decision period can be corrected to contain the sensed output of the knocking in response to the variation of the knocking occurring timing, the knocking sensing precision can be improved.

Abstract: To obtain a knock detection apparatus which may obtain a good knock pulse S/N even if an ionic current generation amount is changed by the change of a kind of fuel or plugs, a knock detection apparatus for detecting a knock generated, in an internal combustion engine, in which a vibratory component superimposed on an ionic current generated by combustion of fuel is extracted, the component that is equal to or more than a knock detection threshold value is shaped in waveform into a pulse waveform, a knock strength is calculated through counting and calculation process of the number of pulses of the pulse waveform by an engine controlling unit, an ignition timing is controlled on the basis of the knock strength, comprises a knock detection threshold value adjusting unit for changing the knock detection threshold value on the basis of information of an ionic current.

Abstract: A device for controlling knocking of an internal combustion engine featuring improved reliability by preventing signals of the knocking level from being erroneously detected as those of the noise level. The device detects an ionic current flowing through a spark plug, counts a signal of the knocking level from the ionic current, establishes an average knocking level from the signals of the knocking level and determines a background level from the average knocking level. A comparator judges the knocking state by comparing the signal of the knocking level with the background level. The device calculates the control quantity of the engine based on the operation conditions and the result of judgement of knocking. The device further judges a transient state and decreases the average knocking level depending upon a transience judgment signal in order to maintain a background level in a transient state at an optimum value.