Abstract:
A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle includes commanding a sliding camshaft actuator to perform a valve step shift, and monitoring an actuator's pin position during the valve step shift command. At least one crank angle is measured when the actuator pin position reaches or exceeds at least one predetermined pin position threshold and at least one remedial action is performed when the actuator pin position does not correlate to the at least one measured crank angle.
Abstract:
An architecture of an ignition and/or injection managing system for an internal combustion engine, of the type structured to cooperate with an electronic engine control unit. Also included is an electronic device architecture for determining the operating phase of an internal combustion motor, of the type structured for cooperating with an electronic motor control unit and inputting a signal issued from a sensor of a phonic wheel associated with the motor camshaft. This device has the task of computing the operating phase by analyzing the signal from the sensor of the driving shaft phonic wheel, so as to release the electronic motor control unit from monitoring the phonic wheel signal, in order to lighten its computational load, and to enable the processing of the signal issuing from a variety of the phonic wheels more commonly used in the automotive industry. The device has the task of calculating the angular position of the driving shaft by analyzing the signal transmitted by the tone wheel of the driving shaft, thereby releasing the engine electronic control unit from the monitoring of the driving shaft angular position to reduce its computational load and allow to process the signal transmitted by a plurality of tone wheels highly widespread in the automotive field. A module is provided that is capable of emitting an interrupt signal toward said control unit on the basis of signals received by said second module.
Abstract:
A cylinder-discriminating device for an internal combustion engine is provided. A reference timing signal is generated whenever the engine rotates through a predetermined rotational angle. A discharge period is detected based on a sparking voltage produced in a particular cylinder or a particular cylinder group in response to an ignition timing signal generated in synchronism with generation of the reference timing signal. Cylinder discrimination is carried out to discriminate between cylinders or between cylinder groups, based on the detected discharge period. In another form, discharge periods are detected based on sparking voltages produced in respective cylinders or respective cylinder groups in response to an ignition timing signal generated in synchronism with generation of the reference timing signal. Cylinder discrimination is carried out to discriminate between the cylinders or between the cylinder groups, based on the detected discharge periods.
Abstract:
In an engine, associated control system, and method the engine including at least one camshaft having an angular position at a given point in time, and a crankshaft having an angular position at a given point in time. The method comprising the steps of measuring a first window of time using at least one crankshaft angular position pulse as a reference point in time and measuring a second window of time using at least one camshaft angular position pulse as a reference point in time. The method also ascertains an angular position difference between at least one camshaft and crankshaft equal to the second window of time divided by the first window of time and determines whether a misalignment between the at least one camshaft and the crankshaft exists by comparing the angular position difference between the at least one camshaft and crankshaft to a predetermined value.
Abstract:
A small, light and low cost ignition distributor having improved rotary detection accuracy can be realized. A pole piece having a pickup coil wound on it and bypass pole pieces having no pickup coil are arranged on the ignition distributor. The distance between the pole piece having a pickup coil and the bypass pole pieces is about 1.5 times as long as the distance between protrusions formed on the peripheral portion of a rotary body. When the distance between the pole piece having a pickup coil and a reluctor is minimum, the distance between the bypass pole pieces and the reluctor is maximum, and the linkage of magnetic flux of the pickup coil is maximum. When the distance between the pole piece having a pickup coil and the reluctor is maximum, the distance between the bypass pole pieces and the reluctor is minimum, and the magnetic flux bypasses the pole piece having a pickup coil and passes through the bypass pole pieces. Accordingly, the change of the magnetic flux passing through the pickup coil can be made to be large, and the change of the generated voltage can be made to be larger so that the rotary detection accuracy is improved.
Abstract:
An apparatus for controlling operation of an internal combustion engine including a multiplicity of cylinders. The apparatus comprises a control means for detecting speedily reference positions for control of the individual cylinders with high reliability. In the control means, a reference position signal generating means for generating a reference position signal containing six equiinterval rectangular pulses each having a duty cycle of 1/2 during a single rotation of a crank shaft is provided in combination with a cylinder identification signal generating means for generating a plurality of different-interval rectangular pulses during a rotation of a shaft interlocked to the cam shaft so that a series of four successive signal levels of the different-interval rectangular pulses sampled at one edges of the equi-interval rectangular pulses differ from one to another succeeding series. The series of the signal levels thus fetched are stored in a signal level data storage means. A reference position determination unit is provided for generating a decision signal by determining the reference positions for the individual cylinders, respectively, on the basis of the four successive signal levels as stored.
Abstract:
An engine control apparatus for discriminating each cylinder of an engine comprises a crank angle rotor (M1) having a configuration representing a crank angle of an engine; a crank angle sensor (M2) operatively associated with the crank angle rotor (M1) to generate a crank angle signal in accordance with the configuration of the crank angle rotor (M1). The configuration of the crank angle rotor (M1) includes first and second silent sections. The first silent section is cooperative with the crank angle sensor (M1) to constitute a part (M3) for generating a first level non-pulsation component of the crank angle signal. The second silent section being cooperative with said crank angle sensor to constitute a part (M4) for generating a second level non-pulsation component of the crank angle signal. There is further provided a cam angle rotor (M5) having a configuration representing a cam angle, which is operatively associated with a cam angle sensor (M6) for generating a cam angle signal to provide a plurality of different kinds of signal level sequences with respect to the first and second silent sections of the crank angle rotor. A cylinder discriminating device (M7) discriminates each cylinder of the engine on the basis of the level of the non-pulsation component of the crank angle signal and the signal level sequences of the cam angle signal.
Abstract:
A control system for an internal combustion engine which includes a crankshaft sensor for sensing a crankshaft transmitter disk and a camshaft sensor for sensing a camshaft transmitter disk. Both sensors supply signals to a control device which calculates ignition and injection signals based upon operating parameters, such as engine load and rotational speed, with the rotational speed being based on the signals for the crankshaft sensor or camshaft sensor. In case of crankshaft sensor failure, an emergency function in the control device simulates the crankshaft signals based on the signals from the camshaft sensor. Preferably, the number of segments on the camshaft transmitter disk are equal to the number of cylinders of the engine.
Abstract:
This invention relates to an event timing apparatus for an internal combustion engine, and more particularly to an improved control arrangement for a fuel injection and ignition arrangement. In accordance with this invention, a timing detecting arrangement is disclosed having a timing correcting circuit for correcting deviations between the actual timing measurements made and the true, desired timing signal required for accurate operation of the fuel injection system. Thus, a fuel injection system and ignition system is provided that is able to provide accurate crank angle timing measurements with reference to which crank chamber pressure and other measurements may be made, in spite of possible manufacturing and/or assembling variations in the timing measuring means. The way in which the manufacturing or assembling of variations are measured is also disclosed.
Abstract:
A cylinder identification apparatus for a multi-cylinder internal combustion engine. The apparatus includes the following units. A reference signal generator that senses the rotation of an engine crankshaft and generates a reference signal indicating each time the crankshaft is at a prescribed rotational angle. An identification signal generator senses the rotation of the engine camshaft or other member coupled to and rotating at 1/2 the speed of the crankshaft and generates a cylinder identification signal having a different form for different cylinders of the engine. A control unit identifies each cylinder of the engine based on the form of the cylinder identification signal.