Abstract: An internal combustion engine, particularly suitable for a motor vehicle, is provided with a plurality of combustion cylinders, at least a first exhaust manifold and a second exhaust manifold and at least one intake manifold. Each exhaust manifold is coupled with a plurality of the combustion cylinders. Each intake manifold is coupled with a plurality of the combustion cylinders. A first turbocharger includes a first turbine having at least one inlet and an outlet, and a first compressor having an inlet and an outlet. The at least one first turbine inlet is fluidly coupled with the first exhaust manifold. A second turbocharger includes a second turbine having an inlet and an outlet, and a second compressor having an inlet and an outlet. The second turbine inlet is fluidly coupled with the second exhaust manifold and includes a controllable, variable intake nozzle. The first compressor outlet is fluidly coupled with the second compressor inlet.

Abstract: An ignition device for internal combustion engines includes an ignition coil with separate primary and secondary windings. A sensor is connected in a spark plug current circuit. A peak value of an ignition current for each ignition is stored in a peak value rectifier and is subsequently processed into a value of a closing duration of the primary circuit, which is maintained at a constant by a control value regulation, to compensate for deviations and soiling or age condition changes in the ignition circuit. The closing duration is ascertained cylinder-selectively below an engine rpm limit value, is ascertained above this limit value only for a predetermined cylinder and is used for all of the remaining cylinders.

Abstract: A constant energy ignition system is disclosed. A first programmable one shot multivibrator controls the dwell of an energy storage device and the firing time to produce an ignition pulse from the stored energy. A second programmable one shot multivibrator, having a duty cycle inversely proportional to the power supply voltage provides the time base for the dwell. A control signal, proportional to the difference of the integrals of the outputs of the first and second one shot multivibrators controls the duty cycle of the first programmable one shot multivibrator.

Abstract: A control circuit which includes a circuit for regulating the time taken to desaturate the switching transistor. This regulating circuit is arranged to control the time for which the transistor is conductive, so that the desaturation time of the transistor is substantially nil when the rate of rotation of the engine is greater than a predetermined value.

Abstract: The present invention utilizes, selectively, a first signal formed in a first section of an ignition period composed of the first section and a second section with a predetermined ratio or a second signal formed in the second section according to a ratio of a time in which a current is supplied to an ignition coil to the ignition time period to obtain a start time of current supply to the coil means.

Abstract: An ignition system for a distributorless internal combustion engine ignition system. Parameters related to the energization of a given ignition coil are stored and later utilized to control the dwell time for this same ignition coil. Another coil is energized and deenergized between the storing of parameters and the subsequent use of the parameters that relate to the given coil. The system causes a spark plug to be fired when a calculated spark timing signal is developed or at a time delayed from the occurrence of the calculated spark timing signal. Delayed spark plug firing occurs when certain conditions are not met prior to the time the calculated spark timing signal occurs. One of these conditions is that primary winding current has not attained a current limit value prior to the time that the calculated spark timing signal occurs.

Abstract: An electronic ignition system is disclosed for controlling as a function of a selected engine parameter the ignition instants of an internal combustion engine having at least one cylinder, a piston, a spark plug for effecting combustion in the cylinder and a rotatable crankshaft coupled to the piston to be rotatably driven as combustions within said cylinder occur at said ignition instants. The crankshaft has a reference position defining a positional relationship of the crankshaft to the cylinder. The ignition system includes an optical encoder directly coupled to the crankshaft for generating ignition signals upon the termination of a variable crankshaft arc beginning at a point fixed with respect to the reference position. The length of the crankshaft arc is set as a function of one or more selected engine parameters.

Abstract: An electronic ignition system for a reciprocal piston, spark ignition internal combustion engine includes sensors which generate output signals representative of the rotational position and speed of the engine output shaft. A computer responsive to the sensor inputs generates an output signal which electrically connects a source of electrical energy to the primary coil of an ignition transformer for a predetermined period of time prior to the desired energization of the spark plug regardless of the rotational speed of the engine output shaft, but dependent on the voltage of the source of electrical energy. Initiation of the predetermined period is dependent on a manually set spark advance.

Abstract: A circuit arrangement for controlling the duration of a current generated in the primary winding of an ignition transformer comprises a ramp generator responsive to the ignition timing or an internal combustion engine for generating a ramp voltage having a constant peak value and a variable rate of increase in voltage as a function of the speed of the engine. A pulse generating means is provided for successively generating a pulse of which the pulse height is substantially equal to the peak value of the ramp voltage and of which the pulse duration is variable inversely as a function of the speed of the engine. To the pulse generating means is coupled an integrator for integrating the pulses supplied thereto to generate an integrated output. The output of the integrator is supplied to a comparator for making a comparison with the instantaneous value of the ramp voltage to generate an ignition current pulse having a duration corresponding to the difference between the compared input variables.

Abstract: An ignition system for the internal combustion engine is provided wherein a retard start timing and a conduction start timing are provided on the basis of an electrical signal produced from a pick-up coil. An ignition timing is provided at a time point following a retard time determined from the retard start timing in accordance with the engine operating conditions while advancing the retard start timing in accordance with the engine r.p.m. Before the lapse of a cut-off period of the ignition coil current required for producing a required ignition pulse, the cut-off state of the ignition coil current is maintained and the conduction start timing is prevented from advancing before the time point immediately following the lapse of the cut-off period.

Abstract: Disclosed is an induction or supercharger system (16) for a piston engine (10) having a Roots type blower (14) for supercharging an air-fuel mixture from a carburetor (12) having primary and secondary throttle valves (64) and (66). The induction system defines a naturally aspirated flow path, a recirculation flow path, and a supercharger flow path. The flow paths are controlled by valves (18) and (20). Valves (18, 64 and 66) are moved between their respective opened and closed positions by a linkage mechanism (44) including a lever (72) and linkage assemblies (74) and (76). The linkage assemblies include resilient means (88) and (102) which respectively move the throttle valves open and the valve (18) closed. Valve (20) is opened in response to a differential pressure across the naturally aspirated flow path and the supercharger flow path.

Abstract: Disclosed is an induction or supercharger system (16) for a piston engine (10) having a Roots type blower (14) for supercharging an air-fuel mixture from a carburetor (12) having primary and secondary throttle valves (64) and (66). The induction system defines a naturally aspirated flow path, a recirculation flow path, and a supercharger flow path. The flow paths are controlled by valves (18) and (20). Valves (18, 64 and 66) are moved between their respective opened and closed positions by a linkage mechanism (44) including a lever (72) and linkage assemblies (74) and (76). The linkage assemblies include resilient means (88) and (102) which respectively move the throttle valves open and the valve (18) closed. Valve (20) is opened in response to a differential pressure across the naturally aspirated flow path and the supercharger flow path.

Abstract: A switching transistor (7, 9) is serially connected with the primary (5) of an ignition coil; current flow therethrough is controlled from an a-c signal generator (16) with respect to an ON threshold level (Ue) to store electromagnetic energy, and an OFF threshold level (Ua) to generate a spark; a variable conductivity circuit (26) controlled from a sensing resistor (8) modifies the response level of the threshold switch (13) with respect to the null or cross-over level of the applied signal. To prevent excessive current flow under idle-speed conditions, in accordance with the invention, the ON threshold level, at least, of the switch is shifted by introducing an auxiliary bias voltage derived from an auxiliary capacitor (36) and connected (37, 38) by the signal source through a diode (38) which prevents application of an auxiliary bias voltage to the threshold switch (13) under extremely low, e.g.

Abstract: A system for controlling the primary current of an ignition coil using a constant current signal having a calculation device to produce a signal for controlling the ON period of the primary current of the ignition coil, wherein a correction calculation device is provided to calculate the corrected value of the constant current period of the ignition coil.

Abstract: In an electronically controlled ignition device for a combustion engine, firstly an ignition timing and an energized angle of an ignition coil are calculated with response to running condition of the engine, secondly a non-energized angle of the ignition coil is calculated based on the result of the above calculation, thirdly the number of pulses generated with response to the angle of revolution of the engine is counted from the preceding ignition timing, so as to start the energizing of the ignition coil when the result of the above count coincides with the result of the above calculation of non-energized angle, and fourthly the number of pulses generated with response to the angle of revolution of the engine is counted from a reference position of revolution at which a reference pulse is generated by the revolution of the engine, so as to cut off the energizing of the ignition coil when the result of the above count of pulses coincides with the present ignition timing.

Abstract: To permit use of shaft position transducers which provide needle pulses at predetermined angular positions of the crankshaft of an engine, such as Wiegand-type, and still enable generation of a counted dwell time even under transient conditions, or under low-speed conditions, the output from the Wiegand transducer is connected to a logic circuit which, under normal operating conditions, by use of a counter counts a predetermined time interval after opening of a switch in series with the ignition coil to determine the dwell period or initiation of current flow for a subsequent ignition event by resetting the counter with a reverse polarity subsequent pulse, thereby passing, upon reset, a predetermined count state which, similar to the normal counting of the count state, initiates closing of the switch.

Abstract: A contactless ignition system of current interruption type for an internal combustion engine comprising at least one pulser device sensing a predetermined maximum advance position and a predetermined minimum advance position of the ignition timing to generate an output signal indicative of such advance positions. On the basis of the output signal of the pulser, a first ramp signal having a first gradient and a second ramp signal having a second gradient are produced, and a signal representing the sum of a reference signal of a constant level and the second ramp signal is compared in a comparator with the first ramp signal. When level coincidence is reached between these two signals, the comparator generates a control signal controlling the turn-on position of a semiconductor switch which controls the ignition timing, so that the duration of current supply for ignition can be maintained substantially constant throughout the rotation speed ranges of the engine.

Abstract: The ignition coil of the system has its primary serially connected with a transistor which controls current flow therethrough. Ignition pulses are provided by an ignition pulse source, for example an inductive transducer. The recurrence rate of the ignition pulses is analyzed and a corresponding control signal is obtained which controls the timing interval of a timing circuit, the timing circuit determining the ON, or connected time, of the transistor or similar controlled switch in series with the primary of the ignition coil. Analysis of the recurrence rate is, simply, done in a pair of integrators, alternately effective and storing the time interval between alternate, succeeding ignition pulses, which permits control of current flow through the ignition coil for a period of time just sufficient for current flow to reach saturation without, however, causing current flow while the circuit is saturated, thus preventing unnecessary heating of the ignition coil and associated components.