Abstract: An improved method and system for the control of an engine system such as the spark timing. The control senses the speed variations either during a portion of a complete cycle and a complete cycle and/or from cycle to cycle in order to determine the load on the engine from preprogrammed maps based upon the engine characteristics. From this load and the speed reading, it is possible to obtain the desired engine control. This not only reduces the costs of the system by reducing the number of sensors, but also permits adjustments to be made more rapidly.

Abstract: The method serves for input signal correction of a misfire detection function and for cylinder equalization in an internal combustion engine, especially of a motor vehicle. Here, it is provided that a control for the input signal correction (10) and a control of the cylinder equalization (11) are activated alternatively by an alternative circuit unit (12).

Abstract: A number of embodiments of improved engine system control method and apparatus based on operator demand and rate of change in demand that reduce not only the number of components but also decrease the complexity of the electronic system without requiring a throttle position sensor.

Abstract: A method and apparatus that permit anti-knock control without the use of separate knock detectors as well as controlling the basic ignition timing from the output of a single engine speed sensor.

Abstract: Method for the damping of mechanical vibrations in the drive train of an internal combustion engine Method for the damping of mechanical vibrations in the drive train of an internal combustion engine, having the following steps:

Abstract: An improved method and system for the control of an engine system such as the spark timing. The control senses the speed variations either during a portion of a complete cycle and a complete cycle and/or from cycle to cycle in order to determine the load on the engine from preprogrammed maps based upon the engine characteristics. From this load and the speed reading, it is possible to obtain the desired engine control. In addition the timing is set in this method only under certain specified conditions and only in response to certain specific parameters. This not only reduces the costs of the system by reducing the number of sensors, but also permits adjustments to be made more rapidly.

Abstract: A torque calculator and method for providing real time data that measures net torque output of a running engine in a motor vehicle. Gross torque production is calculated using engine speed and fueling data. Torque losses due to accessories, pumping, and friction are calculated and subtracted from gross torque production, and inertial torque is also accounted for to yield engine net running torque. The engine net running torque data and engine speed data are processed according to a filter algorithm that compensates the engine net running torque data for engine speed. Transmission shifting is controlled by the speed-compensated engine net running torque.

Abstract: An apparatus and process for diagnosis or control of the ignition or load state of a two or four cycle internal combustion engine. A generator rotating synchronously with the engine generates alternating voltages which are scanned by a control and the alternating voltage amplitudes correspond to the rotational speed of the engine. The control detects at least one of the voltage amplitudes each revolution and, based upon the detected amplitude, calculates a control or diagnosis value, sets one or more flags and/or triggers a control event at an ignition control and/or data output.

Abstract: The invention relates to a method for synchronized ignition in an internal combustion engine with a crankshaft sensor and a device for detecting smooth running. The aim of the invention is to provide a method for synchronized ignition which does not require a camshaft sensor. After the engine has started, ignition takes place in all of the upper dead centers in at least one cylinder, the time of ignition being offset by a certain value each time that the crankshaft passes through 720°. The effect of offsetting the time of ignition is determined by the device for detecting the smoothness of running. Ignition is assumed to have occurred in the area of the upper dead center in which the ignition time is offset when the smoothness of running is modified above a predetermined limit value or is assumed to have occurred in the area of the upper dead center in which the ignition time is not offset when the smoothness of running is not modified above a predetermined limit value.

Abstract: In a method for controlling an internal combustion engine by means of interventions in at least one manipulated variable of the internal combustion engine, a setpoint torque or work which is to be performed is determined at the crankshaft of the internal combustion engine, wherein, with respect to a first variable as work which is to be performed or a setpoint torque to be provided, a corresponding setpoint quantity of heat is determined taking into account the instantaneous actual efficiency, with respect to which at least one associated manipulated variable is set in accordance with the value of the set-point quantity of heat, and, for precise setting of the torque, the actual quantity of heat also being sensed, a setpoint efficiency being determined from the actual quantity of heat taking into account work which is to be performed or a setpoint torque which is to be provided, this can correspond to the first variable or to another variable which is formed as a setpoint torque or work which is to be perform

Abstract: Two embodiments of engine speed control that avoid undesirable vehicle conditions such as wheel slippage or unintentionally performing a wheelie. This is done by sensing actual conditions, which are likely to result in the undesirable vehicle conditions and only changing the engine output when these exact conditions are found. The conditions sensed are the determination of excessive acceleration in engine speed or in the speed of a shaft associated with the engine or the degree of rotational variation or rotational acceleration.

Abstract: The present invention is directed to provide a controller for an internal combustion engine, capable of suppressing deterioration in drivability of an engine. A controller for an internal combustion engine has lean control means for calculating a torque margin from a reference engine speed and an actual engine speed and setting a combustion air-fuel ratio of an internal combustion engine to the lean side on the basis of the torque margin. In addition to correction of a fuel injection amount by the lean control means, the fuel injection amount is further corrected on the basis of a final correction value for reducing deterioration in drivability. The final correction value is set by selecting either a correction value which is set on the basis of an engine speed fluctuation amount or a final correction value of last time, which suppresses deterioration in drivability more. Thus, the operation of setting the air-fuel ratio to the lean side while considering deterioration in drivability can be performed.

Abstract: An inertia-related engine speed fluctuation is computed when the engine is rotated without ignition. A load-related engine speed fluctuation is computed when the engine is rotated with ignition and combustion. The inertia-related engine speed fluctuation is indicative of an inertia moment that is variable in accordance with equipments connected with the engine. The load-related engine speed fluctuation is indicative of an engine load. When estimating the engine load, the inertia-related engine speed fluctuation is considered for removing an influence of the inertia moment on the engine load. The estimated engine load is used for controlling the engine. It is possible to consider the inertia moment into an engine control.

Abstract: The invention relates to a method for combustion misfire detection and cylinder equalization in a multi-cylinder internal combustion engine having knock control. In the method, rough-running values are individually determined for each cylinder by measuring segment times with each crankshaft rotation. The segment times include the times corresponding to the piston movement of each cylinder to be measured in which the crankshaft passes through a corresponding circular-segment angular region. Thereafter, the determined rough-running values are compared to a threshold value in a desired value comparison and, on the basis of the deviation between the determined rough-running values and the desired value, cylinder-individual equalization factors (that is, correction factors) are computed in an evaluation unit for the change of injection times or ignition time points of the individual cylinders.

Abstract: The invention relates to a method for combustion misfire detection in multi-cylinder internal combustion engines. In the method, rough-running values for each cylinder of the engine are determined individually for each crankshaft rotation by measuring the segment times. The segment times include the times corresponding to the piston movement of each cylinder to be measured during which times the crankshaft passes through a corresponding circular segment angular region and, on the basis of filtered rough-running values, equalization or corrective factors are computed for each cylinder in an evaluation unit for influencing injection times or injection time points of each individual cylinder. The determined rough-running values (LUT) or the filtered rough-running values (FLUT) are compared in a desired value comparison to a threshold value (SW2) which is pregiven in value significantly less than the threshold value (SW1) for misfire detection.

Abstract: An ignition control device for controlling a coil device for an internal combustion engine, having a speed measuring device for measuring the speed of the internal combustion engine at a measuring time point within the ignition segment of a specific cylinder; an evaluating device for determining a preestablished ignition angle corresponding to the measured speed, a preestablished charging time corresponding to the measured speed, and a corresponding initial charging angle; an ignition-control-value output device for outputting to the coil device the initial charging angle and the charging time in a charging-time output mode, and the initial charging angle and the ignition angle in an ignition-angle output mode; an error estimating device for estimating an error of the ignition angle in the charging-time output mode and/or an error of the charging time in the ignition-angle output mode, on the basis of a possible speed change after the measuring time point; and an ignition control mode determining device for d

Abstract: A controller for an internal combustion engine is disclosed that improves drivability by always stabilizing combustion. A combustion state is detected based on an engine speed fluctuation every cylinder, and whether combustion is stable is determined. When combustion is stable, whether the condition of executing fuel stability deteriorating operation is satisfied is determined. When combustion is unstable or the condition of executing the fuel stability deteriorating operation is satisfied, a control item adapted to current operating state is selected from control items of ignition timing, ignition method, in-cylinder flow velocity, EGR rate, and air-fuel ratio, and a control is performed so that the combustion velocity and the combustion pressure are stabilized. In the ignition control method, a spark is made a plurality of times by a spark plug. In the control of the in-cylinder flow velocity, a gas flow velocity in a cylinder is increased by strengthening a swirl flow.

Abstract: A method for detecting misfire in an internal combustion engine comprising the steps of measuring instantaneous angular velocity of the engine crankshaft during combustion in the combustion chamber of a piston and cylinder assembly, determining if combustion has occurred using crankshaft acceleration data, measuring engine block combustion energy vibrations by means of an accelerometer, determining whether combustion has occurred using the accelerometer data, identifying the cylinder where the acceleration data originates, comparing the results of the crankshaft acceleration information with the accelerometer information to detect whether each set of data detects misfire, decreasing the threshold for detecting a misfire using accelerometer data if a misfire is detected only by the crankshaft acceleration data whereby a reliable misfire signal can be obtained during those instances when the crankshaft acceleration data is unreliable and increasing the threshold for the accelerometer when the crankshaft acceler

Abstract: An improved method and system for the control of an engine system such as the spark timing. The control senses the speed variations either during a portion of a complete cycle and a complete cycle and/or from cycle to cycle in order to determine the load on the engine from preprogrammed maps based upon the engine characteristics. From this load and the speed reading, it is possible to obtain the desired engine control. This not only reduces the costs of the system by reducing the number of sensors, but also permits adjustments to be made more rapidly.

Abstract: An improved method and system for the control of an engine fuel injection system. The control senses the speed variations either during a portion of a complete cycle and a complete cycle and/or from cycle to cycle in order to determine the load on the engine from preprogrammed maps based upon the engine characteristics. From this load and the speed reading, it is possible to obtain the desired engine fuel injection control. This not only reduces the costs of the system by reducing the number of sensors, but also permits adjustments to be made more rapidly.

Abstract: A torque based cam timing system and method for an engine having dual independent camshafts is disclosed that includes a first set of ROM based calibration tables containing values for intake valve closing and valve overlap that provide best fuel economy and emissions over the operating range of engine speed and engine indicated torque and a second set of ROM based calibration tables containing values for intake valve closing and valve overlap for optimal power over the operating range of engine speed. A power index value that indicates the change in driver desire from fuel economy to power, is used to interpolate over the range of values in the first set of tables to the values in the second set of tables to calculate values of intake valve closing and valve overlap that are optimal for all altitudes.

Abstract: A misfire detection apparatus for an internal combustion engine determines misfire based on first and second variation amounts calculated based on variations of rotational speed of the internal combustion engine. A second variation amount is calculated, and it is determined whether or not a value obtained by multiplying the second variation amount by −1 is greater than a misfire determination level C1, and if the value is less than the level, process proceeds calculates a final variation amount. If the value is greater than a predetermined value, the process determines the final variation amount from the first variation amount. When the processing has been completed, the process determines whether or not the final variation amount is equal to or greater than the misfire determination level.

Abstract: The invention relates to a method for combustion misfire detection in multi-cylinder internal combustion engines. In the method, rough-running values for each cylinder of the engine are determined individually for each crankshaft rotation by measuring the segment times. The segment times include the times corresponding to the piston movement of each cylinder to be measured during which times the crankshaft passes through a corresponding circular segment angular region and, on the basis of filtered rough-running values, equalization or corrective factors are computed for each cylinder in an evaluation unit for influencing injection times or injection time points of each individual cylinder. The determined rough-running values (LUT) or the filtered rough-running values (FLUT) are compared in a desired value comparison to a threshold value (SW2) which is pregiven in value significantly less than the threshold value (SW1) for misfire detection.

Abstract: A control system and method for obtaining combustion stability in an internal combustion engine including an accelerometer mounted on the engine for detecting engine block vibrations and an engine controller for processing an accelerometer output signal indicating engine block vibration intensity to measure cylinder combustion energy, the energy measurement being correlated to other combustion parameters including indicated mean effective pressure (IMEP), the controller developing a control signal that may be used in a closed loop fashion to adjust engine variables including exhaust gas recirculation, air/fuel ratio, and spark advance, thereby adjusting the engine operating characteristics to achieve optimum combustion energy.

Abstract: A method and apparatus are provided for synchronizing an event of an internal combustion engine at least in part as a function of the load on the engine. Desirably, the ignition timing of the engine may be controlled as a function of the load on the engine. Preferably, the system and apparatus utilize existing engine sensors to provide the information needed to determine the load on the engine. Also preferably, the system and apparatus provide the load determination to other systems such as a fuel injection system to improve the timing of the injection event of the system.

Abstract: A vehicle control unit is disclosed which can be coupled between a tachometer sensor and an electronic ignition system on a vehicle. The unit is also coupled to a speedometer sensor to measure the vehicle's speed. The vehicle control unit limits the vehicle speed by modifying the tachometer signal from the tachometer sensor and providing the modified tachometer signal to the ignition system. The tachometer signal is a pulse train which is used by the electronic ignition system to determine ignition timing. The vehicle control unit limits both ground speed and engine speed by suppressing pulses from the original tachometer signal to prevent the combustion of fuel and thereby reduce engine power when the ground or engine speeds exceed predetermined limits. The vehicle control unit is microcontroller-based and preferably includes a logging function and an acceleration sensor. The microcontroller is coupled to the acceleration sensor to detect the peak accelerations experienced by the vehicle.

Abstract: A controller for an internal combustion engine is disclosed that improves drivability by always stabilizing combustion. A combustion state is detected based on an engine speed fluctuation every cylinder, and whether combustion is stable is determined. When combustion is stable, whether the condition of executing fuel stability deteriorating operation is satisfied is determined. When combustion is unstable or the condition of executing the fuel stability deteriorating operation is satisfied, a control item adapted to current operating state is selected from control items of ignition timing, ignition method, in-cylinder flow velocity, EGR rate, and air-fuel ratio, and a control is performed so that the combustion velocity and the combustion pressure are stabilized. In the ignition control method, a spark is made a plurality of times by a spark plug. In the control of the in-cylinder flow velocity, a gas flow velocity in a cylinder is increased by strengthening a swirl flow.

Abstract: In the engine control device, a reference crank angle and the rotational angle of the crank is detected. Based on the rotational frequency of the crank, which has been determined from the detected rotational angle of the crank, time from the reference crank angle to the target crank angle is estimated. Variations in the crank rotation are detected and stored. Based on the stored rotational variations, the periodicity of the rotational variations is detected. Based on the periodicity of the rotational variations, the estimated time from the reference crank angle to the target crank angle is corrected. Based on the thus obtained corrected time, an engine control signal corresponding to the target crank angle is output.

Abstract: The invention is directed to a method and an arrangement for equalizing torque contributions of different cylinders of an internal combustion engine to the total torque of the engine. The engine can operate in an overrun mode and in a fired mode. First quantities (Ka) are provided of a rough running of the engine in the overrun mode and second quantities (Kvi) are provided in the fired mode. Third quantities (Ksi) for a rough-running component based on torsion vibrations are also provided. Cylinder-individual fourth quantities (Kki) for the rough running are formed from the first, second and third quantities with the fourth quantities being independent of the rough running in the overrun mode and independent of the rough-running component based on the torsion vibrations. The torque contributions are equalized on the basis of the fourth quantity.

Abstract: Method for determining the progress of internal pressure of a cylinder in an internal combustion engine, defining for each combustion cycle of the engine, the phases of defining the effective operating point of the engine according to the value assumed by a number of operational parameters of the engine; recording the progress of immediate angular speed of the engine shaft; calculating a transfer function involving the angular speed and the internal pressure of the cylinder at the effective defined operational point, on the basis of a plurality of reference transfer functions between internal pressure and angular speed relative to reference operating points of the engine; and deriving the progress of internal pressure at the cylinder of the transfer function at the actual operating point and of the progress of angular speed.