Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8109254 | Method of controlling the spark lead of an internal combustion engine A method of controlling the spark lead of an internal combustion engine having at least one cylinder fitted with a spark plug; the method including the steps of: determining a standard spark lead value; determining an engine knock index in the cylinder; calculating ... | 02/07/2012 |
| 8109253 | Method for ascertaining the noise emission of an internal combustion engine Methods for ascertaining the combustion noises of an internal combustion engine need only a structure-borne noise sensor and may be carried out using little computing power. ... | 02/07/2012 |
| 7441543 | Device and method for controlling ignition timing of internal combustion engine An engine ECU executes a program including a step of calculating a correlation coefficient K representing a degree of agreement between a vibration waveform and a knock waveform model, a step of calculating a knock magnitude N by dividing a peak value P of magnitude... | 10/28/2008 |
| 7424820 | Knocking state determination device An engine ECU executes a program including a step of calculating intensity values LOG(V) based on signals transmitted from a knock sensor; a step of deciding a maximum value V(MAX) in frequency distribution of intensity values LOG(V) for N cycles (N is a natural num... | 09/16/2008 |
| 7392788 | Device and method for controlling ignition timing of internal combustion engine An engine ECU executes a program including a step of, when an absolute value of a difference between median value V(50) of magnitude values LOG(V), which is obtained by logarithmically converting a magnitude V detected based on a signal sent from a knock sens... | 07/01/2008 |
| 7363142 | Device and method for controlling ignition timing of internal combustion engine An engine ECU executes a program including the steps of: calculating a magnitude value LOG(V) from a magnitude V detected using a knock sensor; calculating a median value V(50) and a standard deviation a of calculated magnitude values LOG(V); calculating a knock det... | 04/22/2008 |
| 7356404 | Knock determination apparatus and method for engines In determining a knock of an engine, a vibration intensity is calculated by logarithm-transforming a peak value or an integral value of an output signal of a knock sensor. Further, a central value VMED of a vibration intensity distribution is calculated, and also a ... | 04/08/2008 |
| 7347081 | Knock detecting apparatus and method for internal combustion engine The signal levels of vibration waveform signals outputted by knock sensors are extracted at a filter processing section for each of a plurality of frequency bands. The mean value of the signal levels in the frequency bands at a point in time when variation of the si... | 03/25/2008 |
| 7334568 | Knock control apparatus for an internal combustion engine and control method thereof In addition to a knock detection filter, a plurality of optimal knock frequency detection filters (digital filters: BPFs) are provided which filter the signals output from a knock sensor and has mutually different filtering frequency bands. A presently optimal frequ... | 02/26/2008 |
| 7310575 | Apparatus for processing sensor signal from knock sensor of internal combustion engine A knock sensor signal processing apparatus for an engine, which performs a series of A/D conversions of a knock sensor signal during each of successive knock judgement intervals to obtain A/D converted values for use in judging if engine knocking is occurring in a c... | 12/18/2007 |
| 7295916 | Method and device for detecting knocking A method and a device for detecting knocking, in which a measurement signal of a knock sensor is evaluated during combustion in a cylinder of a combustion engine to determine whether the combustion occurred with knocking. The measurement signal is subdivided into a ... | 11/13/2007 |
| 7281516 | Ignition timing control device of internal combustion engine An engine ECU executes a program including the steps of: comparing a vibration waveform of an engine and a knock waveform model stored in advance to calculate a correlation coefficient K; prohibiting correction when a correction prohibiting condition of a determinat... | 10/16/2007 |
| 7245101 | System and method for monitoring and control The invention provides for the monitoring and control of a system, such as a linear electro-mechanical transducer, e.g. a linear electric motor, particularly when driven in a reciprocating manner. A dynamic model of the linear motor and its load is used to calculate... | 07/17/2007 |
| 7243529 | Knock detecting apparatus for internal combustion engine A waveform knock signal detected by a knock sensor is filtered through a band-pass filter. The detected wave form signal is compared with an ideal reference knock waveform to determine an engine knock. The ideal reference knock waveform is derived on the basis of a ... | 07/17/2007 |
| 7222607 | DSP-based engine knock detection including knock sensor and circuit diagnostics A knock detection system for a spark-ignition engine includes a knock sensor that is responsive to vibration of the engine and that generates a knock signal. A first module calculates a knock energy based on the knock signal and a second module calculates a knock in... | 05/29/2007 |
| 7212912 | Internal cylinder pressure detection An in-cylinder pressure sensor outputs a signal corresponding to a change rate of an internal cylinder pressure of an engine. The output signal of the in-cylinder pressure sensor is filtered so that frequency components lower than frequencies that substantially comp... | 05/01/2007 |
| 7181338 | Knock determining apparatus for internal combustion engine For each predetermined crank angular interval, an output of a knock sensor is separated into a plurality of frequency components through a plurality of band-pass filters, and peak values of each frequency component are extracted. Then, a mean and a variance of the p... | 02/20/2007 |
| 7174251 | Knocking detection apparatus and detecting method A knocking detection apparatus including: spark plugs disposed in cylinders of an internal combustion engine; an ion current detector for detecting ion currents flowing in the spark plugs; a time-frequency transformer for setting time intervals allowing one or more ... | 02/06/2007 |
| 7114088 | Circuit and method for the input of a start signal for a controller A circuit and method for the input of a start signal, a controller being transferred from a first state into a second state as a function of the start signal, the energy consumption of the controller in the second state being greater than in the first state, the cir... | 09/26/2006 |
| 7043353 | Knock determining apparatus and method for internal combustion engine A plurality of variables representing the characteristics of a knock is obtained from an output signal of a sensor. The variables include a peak value of the knock frequency component in the output signal of the sensor and a waveform correlation coefficient represen... | 05/09/2006 |
| 6980903 | Exhaust gas control using a spark plug ionization signal This feature of the present invention comprises a method and apparatus to reduce NOx emissions in an internal combustion engine. This feature of the present invention uses a closed loop control of the exhaust gas re-circulation to provide the engine with the either ... | 12/27/2005 |
| 6955157 | System for engine retard limit control The present invention provides a system and method for controlling the retard limit of an engine having one or more cylinders in which combustion occurs. A sensor is employed to detect the ionization of the combustion process in the cylinders. The ionization is rela... | 10/18/2005 |
| 6947829 | Apparatus for detecting knocking of internal combustion An apparatus is provided for detecting an occurrence of knocking of an engine from a signal sensed by a knocking sensor for the engine. The apparatus comprises plural filters extracting, from the signal, plural signal components whose frequency bands mutually differ... | 09/20/2005 |
| 6932056 | Method for reacting to knock event in an internal combustion engine A control method for controlling an internal combustion engine selects a knock threshold magnitude and compares it to individual knock event magnitudes. The difference between these two values is calculated and limited to be within a predetermined range of values. T... | 08/23/2005 |
| 6923046 | Arrangement and method to measure cylinder pressure in a combustion engine The pressure in a cylinder of a combustion engine is determined on the basis of vibrations in the engine which are generated during movement of the piston. A vibration signal (S) from a vibration sensor situated on a cylinder is filtered in the region about the pist... | 08/02/2005 |
| 6912460 | Method for detecting knock in an internal combustion engine 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 indivi... | 06/28/2005 |
| 6748922 | Knock control apparatus for internal combustion engine A knock control apparatus normalizes a knock frequency magnitude and a background noise level to substantially the same levels in all the engine operating conditions in consideration of a variation in an ionic current level due to an environment, the number of revol... | 06/15/2004 |
| 6736109 | Knock control system A knock control system is configured to precisely determine situations in which the knock signal cannot be detected and to suppress the occurrence of reductions in fuel efficiency, exhaust performance, and output performance. The knock control system has a knock sen... | 05/18/2004 |
| 6546328 | Knock and misfire detection system The invention relates to a system for detection of combustion anomalies in an internal combustion engine, and includes a crank angle indicator, a vibration sensor, and a signal processor, wherein the signal processor receives signals from the indicator an... | 04/08/2003 |
| 6520149 | Knock control apparatus and method for engines A knock control apparatus has a knock sensor and a signal processor. The signal processor integrates a knock sensor signal and differentiates the integrated signal. The signal processor detects a period in which the differentiated signal exceeds a thresho... | 02/18/2003 |
| 6411886 | Method of detecting and controlling detonation of an internal combustion engine A method of detecting and controlling detonation, including the steps of: generating (10) a vibration signal (D) proportional to the intensity of vibration on the crankcase; wide-band-filtering (11) the vibration signal (D) to generate a first intermediat... | 06/25/2002 |
| 6330874 | Method for the cylinder-selective knock control of an internal combustion engine The total ignition angle ZW(z) of each cylinder z is composed of cylinder-selective values basic ignition angle GZ(z) {determined by engine speed n and load L}, knock adjustment angle KNK(z), in addition to a first adaptation value AD1(z) and a second ada... | 12/18/2001 |
| 6311671 | Method for regulating knocking in ignition systems of internal combustion engines A method for controlling knocking in internal combustion engines. According to this method, a map ignition angle is determined on the basis of detected operating parameters, to which a correction value is additively applied when knock events occur. The co... | 11/06/2001 |
| 6246952 | Engine control signal processing system with frequency analysis by fourier transform algorithm Only predetermined frequency components included in an ion current flowing between an ignition plug and the ground are extracted from the ion current by means of a low pass filter and a high pass filter as a knock detection signal, that is, a signal used ... | 06/12/2001 |
| 6213092 | Method for determining the running smoothness of an otto spark ignition engine The present invention relates to a method for determining the running smoothness of an Otto spark ignition engine by measuring the ionic current (I) in at least one combustion chamber of the Otto spark ignition engine. Once the spark plug has fired, a mea... | 04/10/2001 |
| 6012426 | Automated psychoacoustic based method for detecting borderline spark knock An automated method for detecting borderline spark knock in a spark ignition engine imitates borderline knock procedures in which human operators listen to engine sounds as a function of spark timing. The automated method employs a psychoacoustic model an... | 01/11/2000 |
| 6012425 | Device for detecting knocking and regulation of an internal combustion engine A device for detecting knocking and regulating an internal combustion engine has at least one knocking sensor adapted to be assigned to a cylinder of the internal combustion engine and delivers an electrical output signal which is a function of a combusti... | 01/11/2000 |
| 5992386 | Method for knock control in combustion engines A method for sorting out false indications of a knocking condition in combustion engines, and in a close loop manner influencing the control measures initiated in order to cease the knocking condition, which method includes obtaining an ionization signal ... | 11/30/1999 |
| 5608633 | System and method for detecting knocking for internal combustion engine A system and method for detecting and determining an engine knocking for an internal combustion engine are disclosed in which a whole frequency band of an engine vibration detection signal derived from piezoelectric element type knocking sensor is divided... | 03/04/1997 |
| 5598822 | Knocking detection method for internal combustion engines and ignition timing control method therefor The object of the invention is to provide an engine knocking detection method for detecting a knocking from a plurality of characteristic frequency components indicative of a knocking condition, in which false information indicating a false knock occurren... | 02/04/1997 |
