초록 ▼

A trigger system for spark-fired internal combustion engines includes a plurality of magnets mounted in a structure that rotates in a timed relationship with the engine. One magnet is provided for each cylinder in the engine. All of the magnets except one have the same pole face exposed to couple in

A trigger system for spark-fired internal combustion engines includes a plurality of magnets mounted in a structure that rotates in a timed relationship with the engine. One magnet is provided for each cylinder in the engine. All of the magnets except one have the same pole face exposed to couple inductively with a sensing coil, while the remaining magnet has an exposed pole of opposite polarity. The sensing coil is doubly wound and the resulting two coils are connected in opposite senses. The outputs of the two coils are taken to a decoding unit which produces an output of one pulse per magnet. Those pulses are substantially identical, regardless of magnet polarity, and are used to fire the spark plugs at the appropriate times. The decoding unit also produces a unique pulse which identifies the magnet of opposite polarity. That pulse is used to identify a selected cylider in the engine, such as the No. 1 cylinder. In this manner, the firing of all of the spark plugs, and the identification of the cylinders, are controlled using a single magnet for each cylinder.

대표청구항 ▼

An apparatus for generating ignition trigger and synchronizing signals in a spark-ignited internal-combustion engine having a plurality of cylinders and having a ring gear rotating in timed relationship with the crankshaft of the engine, the apparatus comprising: a plurality of magnets equal in numb

An apparatus for generating ignition trigger and synchronizing signals in a spark-ignited internal-combustion engine having a plurality of cylinders and having a ring gear rotating in timed relationship with the crankshaft of the engine, the apparatus comprising: a plurality of magnets equal in number to the number of cylinders, the magnets being disposed equally spaced on a circle coaxial with the ring gear, one of the plurality having an exposed pole of a first polarity and each of the others of the plurality having an exposed pole of a second polarity opposite to the first polarity; a first coil disposed near the ring gear so as to be inductively coupled to the magnets upon rotation of the ring gear and generate a signal of a first polarity in response to motion of the pole of the first polarity past the first coil; a second coil disposed near the ring gear and near the first coil so as to be inductively coupled to the magnets upon rotation of the ring gear and generate a signal of the first polarity in response to motion of each of the poles of the second polarity past the second coil; and a decoder connected to the first and second coils and receiving as inputs the signals of the first polarity from the first and second coils and producing output signals representing the logical sum of the signals of the first polarity, whereby the signal of the first polarity in the first coil produces a synchronizing output signal and also a predetermined cylinder identifying output signal, said output signals also providing ignition trigger signals for each cylinder.