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WO/1995/010032A1 |
In an engine knock detection process, the knock threshold is weighted or limited. For that purpose, a normal range (NB) of the reference level is defined and when deviations from said normal range (NB) occur the knock threshold (KS) is m...
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WO/1995/008760A1 |
The description relates to a device for fault recognition in connection with a knock-detecting device in an internal combustion engine in which the sensor output signal is compared with a standard reference level depending on the rotatio...
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WO/1995/007451A1 |
An apparatus for detecting faults in the working of a motor driven components of a heating, cooling or dehumidifying unit, including a housing in which are located a) a current sensor (110) which is connectable to the power leads of the ...
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WO/1995/007449A2 |
The invention pertains to a method for determining the combustion air ratio of a reciprocating-piston internal combusion engine, in particular a spark-ignition engine, wherein the gradient of the combustion chamber pressure is measured a...
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WO/1995/007450A1 |
A method, and a corresponding system, for determining misfire in a reciprocating engine measures engine crankshaft angular velocity and provides an angular velocity signal as measured from the engine crankshaft (403). A filtered accelera...
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WO/1995/006295A1 |
A system, and a corresponding method, for measuring a chemical concentration of a gas exhausted from exhaust ports (409, 413) of a multi-cylinder internal combustion engine (401) includes a gas sensing device. This device (419) is prefer...
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WO/1995/004879A1 |
A fuel system for an engine (10) includes a fuel pump (13), a controller (14) which controls the operation of the fuel pump so that fuel is delivered to the engine at the required time and in the desired quantity, and a transducer (15) f...
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WO/1995/004957A1 |
A continuous emission monitoring system for manufacturing plant (10) includes a control system (16) which has associated therewith a virtual sensor network (18). The network (18) is a predictive network that receives as inputs both contr...
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WO/1995/004878A1 |
An internal combustion engine (360) is provided with a plurality of sensors to monitor the operation thereof with respect to various temperature measurements, pressure measurements, etc. A predictive model processor (322) is provided tha...
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WO/1995/002174A1 |
An improved misfire detection in automobile engines may include, in a first embodiment, an automobile engine (12) which has a pressure transducer (16) in its exhaust system (14), and misfires are identified by the pressure drop accompany...
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WO/1995/000833A1 |
The operation of internal combustion engines depends considerably upon quantities which cannot be set accurately enough from outside, e.g. the stoichiometry of the fuel-air mixture before ignition, the proportion of exhaust gas in this g...
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WO/1994/027132A1 |
A process for detecting misfiring in an internal combustion engine in which: uneven running values are detected giving a measure of changes in the crankshaft speed of the engine caused by misfiring; the distance between bands of uneven r...
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WO/1994/019670A1 |
Method and system for detecting misfire in a reciprocating internal combustion engine having an engine cycle frequency in the frequency domain from crankshaft angular velocity. Crankshaft angular position is sensed to develop an electric...
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WO/1994/017297A1 |
An arrangement for determining the parameters of an internal combustion engine, in particular an Otto engine operating with gaseous fuels, has at least one optical sensor for observing the emission of light caused by the combustion in a ...
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WO/1994/016209A1 |
According to the invention, the gas torque (Cg) for each combustion stroke in each cylinder is determined, the engine speed (N) and air inlet manifold pressure (Pca) during the corresponding previous inlet stroke is measured, the referen...
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WO/1994/002824A1 |
A sampling probe is provided for sampling the exhaust gases of internal combustion engines, particularly commercial vehicles. The probe includes a sampling tube (11) having an inlet (12) at one end for receiving the gaseous products. The...
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WO/1994/001748A1 |
A process for the total state observation of an installation having two working machines interconnected by a torsion element allows improved measurement value processing by means of coordinate transformation and by using self-equilibrati...
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WO/1994/000745A1 |
An adaptive method of detecting a misfiring cylinder in a spark-ignited internal combustion engine during substantially all engine operating conditions, including most no-load operation. The method includes the step of normalising an eng...
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WO/1993/025810A1 |
A method of detecting misfire by utilizing the variation of rotation of a crankshaft, capable of detecting the occurrence of misfire accurately with the influence of a detection error eliminated which is ascribed to a structural error of...
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WO/1993/025811A1 |
A misfire detecting method capable of detecting the occurrence of misfire accurately without involving a misfire detection error ascribable to the vibratory increase and decrease, which occurs after misfire has happened, of the variation...
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WO/1993/025809A1 |
A misfire detecting method wherein, when a judgement that an internal combustion engine is operated in a special condition in which a load on the internal combustion engine suddenly varies is made, the detection of misfire is prohibited,...
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WO/1993/024751A2 |
Misfiring of individual cylinders in an internal combustion engine (10) is detected based on sensing exhaust pressure during each operating cycle of the engine. A pressure signal is generated by a pressure transducer means (20) which is ...
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WO/1993/024747A1 |
An on-board oxygen sensor (14) monitoring system includes measuring a first limit cycle of air/fuel controller operation, changing operating parameters of the air/fuel controller (15) and measuring a second limit cycle with the new calib...
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WO/1993/022648A1 |
The invention described enables an engine-monitoring device to be built which determines, essentially from the measurement only of the changes in rotational speed at the gear drive of the engine (optionally from changes in several rotati...
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WO/1993/021508A1 |
The invention concerns a process and a device for detecting combustion irregularities in an internal combustion engine. The process consists in measuring the time intervals between the angular positions of the crankshaft, in grouping the...
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WO/1993/020427A1 |
Methods are presented to remove from misfire/roughness measures both acceleration effects and those errors which are of a cyclical nature over the engine firing cycle. These methods permit the correction in each cylinder measure of such ...
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WO/1993/017233A1 |
A device for performing the feedback control of the air-fuel ratio based on the detection signal of an air-fuel ratio sensor in a specified state of operation and the feedforward control of the air-fuel ratio in other state of operation,...
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WO/1993/014900A1 |
The method consists in measuring, at a given power condition of an engine, the thickness of the oil layer between the lateral surfaces of the piston and of the cylinder, the cylinder and the piston ring, discretely at the cross sections ...
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WO/1993/012332A1 |
In a method for diagnosing an engine (102) using computer based models, a first set of parameters of the engine (102) is sensed and used to determine a modeled value of a first operating characteristic. A second set of parameters of the ...
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WO/1993/008395A1 |
The dynamic behaviour of the engine (1) is monitored and the existence of misfires is deduced from the detection of irregularities in this behaviour induced by these misses. According to the invention, forces transmitted between the engi...
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WO/1993/007497A1 |
The description relates to a process with the aid of which the inaccuracies in the individual segments occurring during the manufacture of a pick-up wheel can be electronically corrected. To this end, in the recognised decelaration runni...
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WO/1993/006448A1 |
A method and apparatus for testing the starting torque of electric motors (30) includes attaching a flywheel (35) of known diameter and weight to the motor's shaft along with an incremental encoder (60) and measuring the amount of shaft ...
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WO/1993/004353A1 |
A dynamic realtime management system (50) for a powered vehicle having a microprocessor (52) adapted to sense realtime inputs related to the condition of the powered vehicle. A plurality of input sensors (54 and 56) are connected to comp...
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WO/1993/002341A1 |
A knock sensor for direct or indirect attachment to an internal combustion engine has a housing (10) with a pressure sleeve (11), on the outside of which are fitted a piezoceramic plate, a seismic mass (16) acting thereon, the contact pl...
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WO/1992/021870A1 |
Machine assemblies often include driving and driven members such an engine associated with a driven load. These members typically include rotatable shafts (16, 18) interconnected by a flexible coupling element (20). System torsionals in ...
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WO/1992/016897A1 |
A dynamical system analyser (10) incorporates a computer (22) to perform a singular value decomposition of a time series of signals from a nonlinear (possibly chaotic) dynamical system (14). Relatively low-noise singular vectors from the...
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WO/1992/015852A1 |
An RPM variation test for use in an engine analyzer system is used to test internal combustion engines. The engine analyzer (10) individually disables cylinders and monitors instantaneous engine RPM, to generate an engine map. The engine...
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WO/1992/014807A1 |
Lubricant efficiency in an internal combustion engine is improved by determining the frictional coefficient of the lubricant and adding appropriate additives to adjust viscosity and surface tension to optimum ranges. This results in impr...
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WO/1992/011522A1 |
In a diagnostic device for detecting defective combustion in an internal combustion engine there is a characteristic mapping in which characteristics depending on the load and revolution speed are stored. Depending on the characteristic ...
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WO/1992/010733A2 |
A method and apparatus for comparing torsional stress/strain states of a power transmitting member of an internal combustion engine to detect an abnormal combustion condition, including misfire, knock or roughness. Statistical processing...
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WO/1992/009875A1 |
The speed of rotation is determined for each cylinder at two positions (z1, z2) of the crankshaft. The positions (z1, z2) of the crankshaft are optimized for the occurrence of abnormal combustion, which is recognized when, according to a...
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WO/1992/009874A1 |
The rates of rotation at two cam-shaft positions (z1, z2) for each cylinder are measured and irregular combustion considered to be detected if the gradient of the rate-of-rotation curve drops below a given threshold value (GW).
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WO/1992/006292A1 |
An ignition adapter for DIS four stroke engines provides conventional voltage waveforms for a diagnostic oscilloscope. Spark plug leads from a DIS four stroke engine are grouped together depending on their respective firing polarity. A f...
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WO/1991/019260A1 |
Dynamic engine diagnostic devices are useful for detecting engine faults such as a misfiring cylinder during normal engine operation. Identification of the particular cylinder having the fault enables repairs to be made more efficiently....
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WO/1991/013246A1 |
Proposed is a diagnostic process for checking regulation elements used in the control of internal-combustion engines, in particular a process for the diagnosis of the operation and the effect of variations in induction-tube or induction-...
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WO/1991/013365A1 |
The process monitors the functioning of an electrical consumer controlled by a control circuit, and records faults in the consumer by composing a signal which serves to control the consumer with a return signal sent to the control circui...
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WO/1991/013333A1 |
To measure the variation in a variable internal pressure in the cylinder of a piston-type internal combustion engine using measurement sensors in interaction with the outside of the cylinders, an acceleration, velocity or displacement si...
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WO/1991/012422A1 |
A process for associating combustion defects with a cylinder in an internal combustion engine which has at least one exhaust pipe between an exhaust gas manifold collecting site and a lambda sensor is characterized in that (a) the volume...
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WO/1991/011599A1 |
A process for identifying a misfiring cylinder in an internal combustion engine with Z cylinders comprises the following steps. For each cylinder z (z of 1 - Z), a time-interval T(z) in which the crankshaft rotates through a given crank ...
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WO/1991/010828A1 |
A means and method for measuring and controlling smoke emissions from an internal combustion engine (11) using a luminosity probe (18 and 19) which measures the luminosity of soot in a combustion chamber (16) of the engine (11). The lumi...
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