摘要:
An ignition system for an internal combustion engine is provided with an ignition timing retarding circuit to prevent overrunning of the engine. The ignition timing retarding circuit includes a switching circuit connected to the gate of an ignition control thyristor and a predetermined duration signal generator for generating a signal having a predetermined duration from a predetermined reference time. During the time period in which the predetermined duration signal is applied to the switching circuit, the switching circuit is maintained conductive to thereby bypass an ignition signal generated in synchronism with the crankshaft rotation and applied to the gate of the ignition control thyristor. As the engine speed increases, since the period of generation of the ignition signal is shortened, by selecting the duration of the predetermined duration signal with respect to the period of the ignition signal corresponding to a high engine speed to be prevented so that the leading end portion of the ignition signal overlaps the terminating end of the predetermined duration signal by a desired period of time or a desired degrees, the ignition timing retarded by the desired period of time or desired degrees.
摘要:
Ignition timing control device for internal combustion engines, which comprises a base mounted on the engine crankcase and rotatably carrying a control disc which is co-axial with a driving shaft adapted to be driven by the engine crankshaft. The control disc carries one or more ignition signal generating units and the base carries an intake pressure responsive device which determines the position of the control disc in accordance with the engine intake pressure.
摘要:
Electronic signal processing circuitry particularly useful in the ignition system of an internal combustion engine is disclosed. A pulse generator includes a crank-shaft position sensor supplying periodic position pulses to a bi-stable flip-flop circuit controlling a dual slope integration circuit. The integration circuit establishes a dual ramp time varying voltage signal at one input to a comparator for comparison with a reference voltage source which is established at the second input. At equality, an output pulse is initiated at the output of the comparator and this pulse is also used to change the logic state of the flip-flop. A hysteresis circuit responds to the initiation of the output pulse by modifying by a predetermined amount, the reference voltage level at the comparator. The duration of the output pulse is thereby made selectable and independent of variations in the period of the sensor pulses.
摘要:
An ignition system for an internal combustion engine, which includes circuitry for producing pulses at a frequency directly related to rotational speed of the engine and a capacitor discharge circuit. A first monostable circuit responsive to the pulses is arranged for triggering the capacitor discharge circuit by passing from its stable state to its unstable state. A second monostable circuit responsive to the pulses is arranged for triggering the capacitor discharge circuit when passing from its unstable state to its stable state. The time constant of the first monostable circuit is substantially equal to the frequency of the ignition system discharge corresponding to the maximum admissible speed of the engine. The time constant of the second monostable circuit being equal to a predetermined value equal to a value of retarded ignition allowing operation of the engine at a reduced power.
摘要:
In an internal combustion engine ignition system having a knock sensor to back-off the ignition advance at the onset of pre-ignition knocking in the engine, the sensor is activated only during a fraction of the power stroke of each piston and the activation is achieved by processing of the ignition triggering signal rather than by incorporation of position sensors on the drive shaft of the engine/gearbox combination. The signal-processing device includes first stage means to generate a signal which is shifted by a constant time relative to the signal which it receives, and second stage means which generates a signal which is shifted relative to the incoming signal by a time corresponding to a constant angle of rotation of the engine (to take into account engine rotation speed) and these stages define the beginning and the end of the periodic signal required for control of the vibration sensor.
摘要:
A self-adaptive system for optimizing ignition timing in an internal combustion engine wherein a signal representing engine manifold absolute pressure is multiplied by a signal representing engine speed to provide a product signal. The product signal is differentiated and applied as the numerator in a divider. The quotient output of the divider is fed back to the divider input as the denominator. The quotient output of the divider is further integrated and the integrated quotient is used as a command signal for setting the spark timing.
摘要:
An ignition system comprises first and second series supply circuits including an ignition coil having a primary winding and a set of breaker contacts serially connected to said primary winding of said ignition coil, said first and second sets of breaker contacts having different opening times. A thyristor is connected in at least one of the two circuits. A firing signal is applied to the thyristor in accordance with the mode of operation of an associated engine, to enable the conduction of said thyristor in a first ignition mode being effected by said first and second sets of breaker contacts and in a second ignition mode being effected by either one of said first and second sets of breaker contacts.
摘要:
An ignition retarding device which cuts off the usual vacuum ignition advance to retard the ignition when the engine speed drops below a predetermined value. The speed is measured by an electronic tachometer whose input is connected across the distributor points and whose output is fed through a voltage comparator and an amplifier to control the energization of an electrically operated valve. The vacuum ignition advance may also be cut off when the brakes are actuated and there may be a further device responsive to engine temperature to restore the vacuum ignition advance if the engine temperature rises above a predetermined value. The override brake and temperature signals may be obtained by connections to the usual brake switch and temperature switch. Provision is made for use of the equipment with automotive vehicles either in which the brake switch is between the brake light and ground or between the battery and the brake light.
摘要:
A combustion engine with an exhaust gas cleaning arrangement operable at predetermined temperature and placed in the exhaust gas conduit of the engine, such predetermined temperature is attained by the exhaust gas cleaning arrangement through the heat of the exhaust gases, a device for adjusting the ignition timing and the fuel supply to the engine during a cold start thereof or during an idle running phase of operation thereof for delivering exhaust gases having an increased temperature for quickly heating up the cleaning arrangement including a pair of switching contacts serially connected with respect to each other in a circuit, a pair of magnetically operated solenoid valves connected parallel with respect to each and series with respect to the switching contacts, a suction pipe supplying fuel-air mixture to the engine with a butterfly valve for controlling the quantity of the fuel and air mixture, a conduit branch bypassing the butterfly valve, one of the magnetic valves is coupled into the branch conduit for effecting opening or closing thereof, a low pressure conduit connected to the suction pipe, a device for adjusting the ignition timing connected to the low pressure conduit, the other of the magnetic valves is coupled to the low pressure conduit for effecting the opening or closing thereof, a thermostat for sensing the temperature of the exhaust gas cleaning arrangement and connected for operating one of the switching contacts for effecting energization of the magnetic valves, a cam fixedly coupled with the butterfly valve for effecting the actuation of the other of the switching contacts, the magnetic valves receiving energizing current when both of the switching contacts are actuated, whereby an enriched fuel-air mixture is supplied to the engine through the pipe-conduit when it is opened by one of the magnetic valves, and the ignition timing device is set ''''delayed'''' by the adjusting device in response to a pressure condition in the low pressure conduit when the other of the magnetic valves opens the conduit during the idle running operation of the engine.
摘要:
A contactless distributor in which the ignition timing is energized in response to signals produced by a plurality of magnetic elements moving in a circular path past a magnetodiode pickup element. The magnetic elements are mounted on a plate or disc attached to the distributor shaft and the pickup element is mounted for movement along the path to vary the ignition timing.