JP4379108B2 - Ignition device for internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine ignition device that controls the ignition position of an internal combustion engine using a microcomputer.

  An ignition device for an internal combustion engine includes an ignition control circuit that controls a primary current of the ignition coil so as to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given; A signal generator attached to the engine for obtaining a signal including rotation information (crank angle information and rotation speed information), and a rotation speed calculation means for calculating the rotation speed of the engine based on the signal obtained from the signal generator; The engine ignition position (ignition operation is performed with respect to the rotation speed calculated by the rotation speed calculation means (when the control conditions necessary for controlling the ignition position are outside, the rotation speed and other control conditions). Ignition position calculation means for calculating (crank angle position) and an ignition signal for performing processing for detecting the calculated ignition position and for providing an ignition signal to the ignition control circuit when the calculated ignition position is detected And a supply means, and ignition position calculating means constitutes an ignition timing control means by an ignition signal supply means. These means are configured by causing a microcomputer to execute a predetermined program.

  The signal generator detects, for example, the edge of a reluctator provided on a rotor that rotates synchronously with the engine, and is sufficiently higher than the top dead center position (crank angle position when the piston reaches top dead center). A first crank angle detection signal is generated at a reference crank angle position set at an advanced position, and at a certain crank angle position near the top dead center position suitable as an ignition position at the time of engine start and extremely low speed. A second crank angle detection signal is configured to be generated.

  The rotation speed calculation means obtains the time required for the engine to make one rotation, for example, from the interval at which the signal generator generates the pulse signal, and calculates the rotation speed from this time.

  The ignition position calculation means calculates an ignition position with respect to control conditions such as a rotational speed using a map for calculating the ignition position and / or a predetermined calculation formula. This ignition position is calculated, for example, in the form of an angle from the top dead center of the engine to the ignition position.

  The ignition signal supply means is a reference crank for generating a first crank angle detection signal from the rotation speed calculated by the rotation speed calculation means and the ignition position data calculated by the ignition position calculation means. The time required for the engine to rotate from the angular position to the calculated ignition position is calculated as ignition timer timing data, and when the first crank angle detection signal is generated, the ignition timer starts measuring the timing data. When the measurement is completed (when the calculated ignition position is detected), an ignition signal is given to the ignition control circuit.

  The ignition control circuit includes an ignition capacitor that is provided on the primary side of the ignition coil and is charged by an ignition power source, and an ignition switch that discharges the charge of the ignition capacitor through the ignition coil when an ignition signal is given. In addition, a capacitor discharge type circuit that induces a high voltage for ignition in the secondary coil of the ignition coil by discharging the ignition capacitor, or a current that has been passed through the primary coil of the ignition coil is interrupted to cut off the secondary current of the ignition coil. It is constituted by a known circuit such as a current interrupting circuit for inducing a high voltage for ignition in the next coil. The ignition high voltage that is induced in the secondary coil of the ignition coil when the ignition signal is given is applied to the spark plug attached to the cylinder of the engine, so that spark discharge occurs in the spark plug and the engine is ignited. Is done.

  As described above, in the ignition device that controls the ignition position using the microcomputer, the calculated ignition position is converted into the ignition timer timing data using the rotational speed of the engine, and the timing data is measured. The ignition position is detected by this, but at the time of starting the engine and at a very low speed rotation, the rotational speed fluctuation accompanying the engine stroke change is severe, so the rotational speed calculated by the rotational speed calculation means is used. The ignition position cannot be accurately detected by the method of measuring the obtained ignition timer timing data. Therefore, in this type of ignition device, as shown in Patent Document 1, the signal generator generates a second crank angle detection signal near the top dead center position of the piston when the engine is started and at an extremely low speed. Sometimes, an ignition signal is often given to the ignition control circuit through an initial ignition signal supply circuit comprising a hardware circuit.

  As described above, in the ignition device for an internal combustion engine in which the ignition position is controlled using the microcomputer, the engine operating characteristics are changed by changing various data such as map data used for calculating the ignition position. In order to facilitate this, an external memory composed of a rewritable nonvolatile memory such as an EEPROM is provided, and data such as map data necessary for calculating the ignition position is stored in the external memory. It has been broken. Such an ignition device is disclosed in Patent Document 2, for example.

Thus, in the internal combustion engine ignition device in which the data used for the calculation of the ignition position is stored in the external memory, when a certain time has elapsed after the power supply of the microcomputer is established at the start of the engine As shown in FIG. 4, first, initial setting (step 1) such as function setting of each boat of the microcomputer is performed, and then data necessary for calculation of the ignition position is read from the external memory (step 2). After completing the reading of data from the external memory, various calculations such as calculation of engine speed and calculation of ignition position are performed. Step 2 in FIG. 4 constitutes external memory data reading means for reading data stored in the external memory when the internal combustion engine is started. The ignition position calculation means calculates the ignition position of the internal combustion engine using data read from the external memory.
JP-A-8-292916 JP 11-351111 A

  In the internal combustion engine ignition device having an external memory storing data necessary for the calculation of the ignition position as described above, and starting the calculation of the ignition position after reading the data from the external memory when the engine is started When an initial ignition signal supply circuit that provides an ignition control circuit when a signal generator generates a crank angle detection signal at the time of engine start and extremely low speed is provided, depending on the timing at which the start operation is performed, When the external memory data reading means is reading data from the external memory, an ignition signal may be given from the initial ignition signal supply circuit to the ignition control circuit, and an ignition operation may be performed. As described above, if the ignition operation is performed while data is being read from the external memory, the data being read may change due to ignition noise. There is a possibility that the position calculation is not performed accurately.

  When an external sensor for detecting a control condition used for ignition position control or the like is provided, the external sensor output is read through the A / D converter after reading the data in the external memory when the engine is started. In this case, when the ignition signal is given from the initial ignition signal supply circuit to the ignition control circuit during the reading of the output of the external sensor and the ignition operation is performed, the A / O of the output of the external sensor is also caused by ignition noise. There is a possibility that the D conversion value is incorrect and the calculation of the ignition position cannot be performed accurately.

  An object of the present invention is to provide an ignition device for an internal combustion engine in which the value of data read into a microcomputer at the start of the engine is prevented from being distorted by ignition noise and the ignition position can be accurately controlled. There is.

  The present invention relates to an ignition control circuit that controls a primary current of an ignition coil so as to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given, and an internal A signal generator that generates a crank angle detection signal at a predetermined crank angle position as an ignition position at low speed, and an initial ignition signal that gives an ignition signal to the ignition control circuit when the signal generator generates a crank angle detection signal Using a supply circuit, an external memory storing data used to calculate the ignition position of the internal combustion engine, an external memory data reading means for reading data stored in the external memory when the internal combustion engine is started, and data read from the external memory And an ignition position control means for providing an ignition signal to the ignition control circuit at the calculated ignition position. Target ignition device provided with and.

  In the present invention, in order to achieve the above object, the ignition control circuit is ignited from the initial ignition signal supply circuit until the external memory reading means completes the reading of the data stored in the external memory when the internal combustion engine is started. An initial ignition signal blocking means for blocking the signal is provided.

  As described above, the initial ignition signal blocking means for blocking the ignition signal from being supplied from the initial ignition signal supply circuit to the ignition control circuit until the reading of the data stored in the external memory is completed when the internal combustion engine is started. Since it is possible to eliminate the possibility of ignition noise during data reading, it is possible to prevent the read data from being changed due to the influence of ignition noise and the ignition position from being accurately controlled. .

  The present invention also provides an ignition control circuit that controls a primary current of the ignition coil so as to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given; A signal generator for generating a crank angle detection signal at a predetermined crank angle position as an ignition position at extremely low speed, and an initial stage for giving an ignition signal to the ignition control circuit when the signal generator generates a crank angle detection signal An ignition signal supply circuit, an external sensor for detecting a control condition used for calculating an ignition position of the internal combustion engine, a control condition reading means for reading a control condition detected by the external sensor, and a control read by the control condition reading means A microcomputer that constitutes an ignition position control means that calculates an ignition position of the internal combustion engine using conditions and provides an ignition signal to the ignition control circuit at the calculated ignition position. It is applied to an internal combustion engine ignition system and a Yuta.

  In this case, the initial ignition signal is prevented so as to prevent the ignition signal from being supplied from the initial ignition signal supply circuit to the ignition control circuit until the control condition reading means completes the reading of the control condition before starting the internal combustion engine. Configure blocking means.

  The present invention also provides an ignition control circuit that controls a primary current of the ignition coil so as to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given; A signal generator that generates a crank angle detection signal at a predetermined crank angle position as an ignition position at extremely low speed, and initial ignition that gives an ignition signal to the ignition control circuit when the signal generator generates a crank angle detection signal A signal supply circuit, an external memory storing data used for calculating the ignition position of the internal combustion engine, an external sensor for detecting a control condition used for calculating the ignition position of the internal combustion engine, and stored in the external memory when starting the internal combustion engine External memory data reading means for reading the read data, control condition reading means for reading the control conditions detected by the external sensor, and data read from the external memory And a microcomputer constituting ignition position control means for calculating an ignition position of the internal combustion engine using the control condition read by the control condition reading means and giving an ignition signal to the ignition control circuit at the calculated ignition position. It is applied to an ignition device for an internal combustion engine.

  In this case, the initial ignition signal is supplied until the external memory reading means completes the reading of the data stored in the external memory before the internal combustion engine is started and the control condition reading means completes the reading of the control conditions. The initial ignition signal blocking means is configured to block the ignition signal from being supplied from the circuit to the ignition control circuit.

  As described above, according to the present invention, until the reading of data stored in the external memory at the start of the internal combustion engine is completed and / or until the reading of the output of the external sensor for detecting the control condition is completed. In the meantime, since the initial ignition signal blocking means for blocking the ignition signal from being supplied from the initial ignition signal supply circuit to the ignition control circuit is provided, it is possible to eliminate the possibility of ignition noise during data reading, and to read data It is possible to prevent the ignition position from being accurately controlled due to the influence of the ignition noise.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of the configuration of hardware used in an embodiment of the present invention. In FIG. 1, 1 is a magnet type AC generator driven by an internal combustion engine (not shown), and 2 is a predetermined crank angle of the internal combustion engine. A signal generator that generates a crank angle detection signal at a position.

  The magnet type AC generator 1 includes a magnet rotor 1A formed by attaching a permanent magnet to the inner periphery of a peripheral wall portion of a cup-shaped flywheel, and an armature 1B formed by winding an exciter coil Le around an armature core. The exciter coil Le synchronizes with the rotation of the engine an alternating voltage composed of a positive half-wave voltage in the direction of the solid arrow and a negative half-wave voltage in the direction of the dashed arrow. Output.

  The signal generator 2 is magnetically coupled to an iron core having a magnetic pole at the tip thereof facing the reluctator 1r provided on the outer periphery of the flywheel of the magnet rotor 1A, a signal coil Ls wound around the iron core, and the iron core. A permanent magnet, and detects a first edge 1r1 in the rotational direction of the reluctator 1r at a reference crank angle position set at a position sufficiently advanced from the top dead center position of the engine. A crank angle detection signal Vs1 is generated, and the second edge 1r2 in the rotational direction of the reluctator 1r is detected at the starting position of the engine set at the top dead center position and at an extremely low ignition position. A crank angle detection signal Vs2 is generated. The first crank angle detection signal Vs1 and the second crank angle detection signal Vs2 are pulse waveform signals having different polarities.

  The positive half-wave output voltage and the negative half-wave output voltage generated by the exciter coil Le are input to the booster circuit 3 and the power supply circuit 4, respectively. The booster circuit 3 is formed of a chopper circuit that intermittently outputs the output current of the exciter coil Le, boosts the positive half-wave output voltage of the exciter coil, and supplies it to an ignition capacitor described later. In this example, the exciter coil Le and the booster circuit 3 constitute an ignition power supply unit.

  The power supply circuit 4 is a circuit that outputs a constant DC voltage using the exciter coil Le as a power source. In the illustrated example, the power supply circuit is suitable for driving a microcomputer with the negative half-wave output voltage of the exciter coil. It is configured to convert to a constant DC voltage Vcc (in this example, 5 [V]).

  Reference numeral 5 denotes an ignition coil having a primary coil W1 and a secondary coil W2 that are grounded at one end. Reference numeral 6 denotes a capacitor discharge type ignition control circuit that controls a primary current of the ignition coil 5. The ignition coil 5 and the ignition control circuit 6 An ignition circuit is configured. A non-grounded side terminal of the secondary coil W2 of the ignition coil is connected to a non-grounded side terminal of a spark plug P attached to the cylinder of the internal combustion engine.

  The ignition control circuit 6 is provided on the primary side of the ignition coil and is charged by the output of the ignition power source. The ignition control circuit 6 discharges the electric charge of the ignition capacitor Ci to the primary coil W1 of the ignition coil when it is conducted. In the example shown in the figure, one end of the ignition capacitor Ci is connected to the primary coil W1 of the ignition coil through a diode D1 with the cathode facing the capacitor Ci side. Connected to the non-ground terminal. The other end of the ignition capacitor Ci is connected to a non-grounded output terminal of the booster circuit 3 (an output terminal of the ignition power supply unit) through a diode D2 having a cathode directed toward the capacitor Ci. One end of the ignition capacitor Ci is also grounded through a diode D3 with the cathode facing the ground side, and the ignition capacitor Ci is charged with the polarity shown in the figure by the output voltage of the booster circuit 3.

  An ignition switch 6A is connected between the other end of the ignition capacitor Ci and the ground. When the ignition switch 6A is turned on, the charge of the ignition capacitor Ci passes through the ignition switch 6A, the primary coil W1 of the ignition coil, and the diode D1. It is designed to discharge. A thyristor can be used as the ignition switch 6A.

  The ignition switch 6A is turned on when an ignition signal is given to its control terminal 6a. When the ignition switch 6A is turned on, the electric charge accumulated in the ignition capacitor Ci is discharged through the ignition switch 6A, the primary coil W1 and the diode D1 of the ignition coil, and a large current flows through the primary coil W1, A large magnetic flux change occurs in the iron core of the ignition coil, and a high voltage for ignition is induced in the secondary coil W2 of the ignition coil. Since this high voltage is applied to the spark plug P connected to the secondary coil W2 of the ignition coil, a spark discharge is generated in the spark plug and the engine is ignited.

  A microcomputer 7 includes a CPU 7a, a timer 7b, an internal memory 7c, an A / D converter 7d, and the like. The microcomputer 7 has an external memory 8 formed of a rewritable nonvolatile memory (EEPROM in the illustrated example). It is connected. The external memory 8 calculates ignition positions such as a map used for calculating the ignition position and a correction coefficient for multiplying the calculated ignition position in order to correct the calculated ignition position according to various control conditions. Necessary data is stored.

  The first crank angle detection signal Vs1 and the second crank angle detection signal Vs2 output from the signal generator 2 are converted into waveforms that can be recognized by the microcomputer by the waveform shaping circuit 9, and the port A1 of the microcomputer 7 and Input to A2. External sensors 10 and 11 for detecting control conditions such as the throttle valve opening and the engine temperature (cooling water temperature) are provided, and the outputs of these sensors are input to the A / D converter 7d. The A / D converter 7d converts the analog signal output from the external sensors 10 and 11 into a digital signal and gives it to the CPU.

  A port A3 of the microcomputer is used as an output port for outputting an ignition command signal, and an ignition command signal output from the port A3 is given to the ignition signal output circuit 12. The ignition signal output circuit 12 outputs an ignition signal Vi1 by the output of the power supply circuit 4 when an ignition command signal is given from the microcomputer. The ignition signal Vi1 is input to the control terminal of the ignition switch 6A through a diode D4 whose cathode is connected to the control terminal 6a of the ignition switch 6A. In this example, the signal obtained by shaping the waveform of the second crank angle detection signal Vs2 output from the signal generator 2 by the waveform shaping circuit 9 is used to determine the ignition position at the start of the engine and at an extremely low speed. Vio is given to the control terminal of the ignition switch 6A through a diode D5 with the anode facing the waveform shaping circuit. In the illustrated example, the waveform shaping circuit 9 and the diode D5 constitute an initial ignition signal supply circuit.

  An initial ignition signal removal circuit 13 is connected between the anode of the diode D5 and the ground, and an initial ignition signal removal command Vt is given from the port A4 of the microcomputer 7 to the initial ignition signal removal circuit 13. The initial ignition signal removal circuit 13 is composed of a switch element such as a transistor, and is turned on when an initial ignition signal removal command is given from the port A4 of the microcomputer, and the initial ignition signal given from the waveform shaping circuit 9 By short-circuiting the signal Vio, the initial ignition signal Vio is prevented from being applied to the ignition switch 6A.

  A constant DC voltage Vcc output from the power supply circuit 4 is applied as a power supply voltage to the power supply terminal of the microcomputer 7. The microcomputer starts the initial setting task shown in FIG. 2 when a certain period of time has elapsed after the power supply voltage is established. In step 1, the microcomputer initializes each part and sets the function of the port. Next, in step 2, an initial ignition signal blocking command is generated from the port A4 to prohibit initial ignition, and in step 3, data stored in the external memory 8 is read and stored in the RAM in the microcomputer. This step 3 constitutes external memory data reading means. In step 4, the digital conversion values of the outputs of the external sensors 10 and 11 whose control conditions are detected are read and stored in the RAM. This step 4 constitutes a control condition reading means. Thereafter, in step 5, the output of the initial ignition signal blocking command from the port A4 is stopped, and the prohibition of the initial ignition is released. Thereafter, a rotation speed calculation means for calculating the rotation speed of the engine based on the generation interval of the signal (crank angle detection signal) generated by the signal generator 2 (for example, the interval at which the first crank angle detection signal Vs1 is generated), Ignition position calculation means for calculating the ignition position of the engine with respect to the rotation speed calculated by the speed calculation means (the rotation speed and other control conditions when the control conditions necessary for controlling the ignition position are outside); Various means such as an ignition signal supply means that performs processing for detecting the ignition position calculated by the ignition position calculation means and gives an ignition signal to the ignition control circuit when the calculated ignition position is detected are configured. To do.

  The ignition position calculation means calculates the ignition position at each rotation speed by searching an ignition position calculation map for the rotation speed, for example.

  The signal generator 2 generates a first crank angle detection signal from the rotation speed calculated by the rotation speed calculation means and the ignition position data calculated by the ignition position calculation means. Ignition timer timing data calculation means for calculating the time required for the engine to rotate from the reference crank angle position to the calculated ignition position as ignition timer timing data, and the signal generator 2 at the reference crank angle position and the first crank angle When the detection signal Vs1 is generated, the ignition timer starts measurement of the time measurement data. When the measurement is completed (when the calculated ignition position is detected), an ignition command is sent from the port A3 to the ignition signal output circuit 12. Ignition command generating means for giving a signal, and an ignition timer timing data calculating means, an ignition command generating means, and an ignition signal output circuit 12 Ignition signal supply means for supplying an ignition signal to the ignition control circuit is constituted when the ignition position has been detected.

  When reading the data stored in the external memory, when the ignition signal Vio is given from the initial ignition signal supply circuit and the ignition operation is performed, it is read into the microcomputer by the ignition noise generated when the ignition spark is generated. Data may change. If the data read from the external memory to the microcomputer changes, the ignition position cannot be calculated accurately, and the ignition position cannot be accurately controlled.

  In particular, an ignition device for a batteryless internal combustion engine in which a power supply voltage is supplied to a microcomputer from a power supply circuit that outputs a constant voltage using a generator driven by the internal combustion engine as a power supply without using a battery. In the process of starting operation (cranking), it is necessary to establish the power supply of the microcomputer and read the data stored in the external memory. After the key switch is turned on, the microcomputer Since it is impossible to start the engine after waiting for the data stored in the external memory to be read, the above-mentioned problems are likely to occur.

  Therefore, in the present invention, the ignition signal is prevented from being supplied from the initial ignition signal supply circuit to the ignition control circuit 6 until the external memory reading means completes reading of the data stored in the external memory when the internal combustion engine is started. An initial ignition signal blocking means is provided. The initial ignition signal blocking means outputs an initial ignition signal blocking command from the port A4 until the reading of data from the external memory is completed and the control condition reading means completes reading of the control conditions (output of the external sensor). The generated initial ignition signal blocking command generating means and the initial ignition signal removing circuit 13 shown in the figure are included. In the case of the algorithm shown in FIG. 2, the initial ignition signal block command generating means is constituted by steps 2 and 4. The initial ignition signal removal circuit 13 keeps the internal switch on while the initial ignition signal removal command is being given, and prevents the ignition control circuit 6 from being given an ignition signal.

  Thus, the ignition from the initial ignition signal supply circuit is performed until the reading of the data stored in the external memory at the start of the internal combustion engine is completed and until the reading of the output of the external sensor for detecting the control condition is completed. If an initial ignition signal blocking means for blocking the ignition signal from being supplied to the control circuit is provided, ignition noise does not occur during data reading. It is possible to prevent that the control is not performed accurately.

  The present invention particularly relates to a batteryless internal combustion engine ignition device that applies a power supply voltage to a microcomputer from a power supply circuit that outputs a constant voltage using a generator driven by the internal combustion engine as a power supply without using a battery. Useful.

  In the example shown in FIG. 1, the booster circuit 3, the power supply circuit 4, the ignition control circuit 6, the microcomputer 7, the external memory 8, the waveform shaping circuit 9, the initial ignition signal removal circuit 13, and the diode D2 Or D5 is unitized to form an electronic control unit (ECU).

  In the above embodiment, the ignition signal is given to the ignition control circuit through the initial ignition signal supply circuit until the reading of the data stored in the external memory and the reading of the data stored in the external sensor are completed. If there is no external sensor that reads the output when the engine is started, the ignition control circuit passes through the initial ignition signal supply circuit until the data stored in the external memory is completely read. Is prohibited from being given an ignition signal, and when the reading of the data stored in the external memory is completed, the ignition control circuit is allowed to be given an ignition signal through the initial ignition signal supply circuit (the prohibition is canceled). It may be. In this case, the algorithm of the program executed by the microcomputer at the initial setting is as shown in FIG. In this case, the initial ignition signal blocking means includes an initial ignition signal blocking command generating means for generating an initial ignition signal blocking command from the port A4 until reading of data from the external memory 8 is completed, and an initial ignition signal removal shown in the figure. And the circuit 13.

  Even if an external memory is not provided, the present invention can be applied when it is necessary to read the output of an external sensor when the engine is started. In this case, the initial ignition signal is prevented so as to prevent the ignition signal from being supplied from the initial ignition signal supply circuit to the ignition control circuit until the control condition reading means completes the reading of the control condition before starting the internal combustion engine. Configure blocking means. In this case, the initial ignition signal blocking means generates an initial ignition signal blocking command from the port A4 until reading of the data (output of the A / D converter 7d) from the external sensors 10 and 11 is completed. The blocking command generating means and the initial ignition signal removing circuit 13 shown in FIG.

  In the above embodiment, when the initial ignition signal blocking command is generated, the initial ignition signal removal that bypasses the initial ignition signal that is given from the waveform shaping circuit 9 to the ignition control circuit 6 through the diode D5 from the ignition control circuit 6. Although the circuit 13 is provided to prevent the ignition control circuit 6 from being supplied with the initial ignition signal, the circuit configuration for preventing the initial ignition signal from being supplied to the ignition control circuit is limited to the above example. Not. For example, an initial ignition signal is given to the ignition control circuit by inserting a switch between the waveform shaping circuit 9 and the diode D5 and keeping the switch off while the initial ignition signal blocking command is generated. You may make it prevent.

  In the embodiment shown in FIG. 1, the exciter coil Le and the booster circuit 3 constitute an ignition power supply unit that outputs a voltage for charging the ignition capacitor, but the exciter coil Le alone constitutes the ignition power supply unit. In this case, the present invention can be applied. The present invention can also be applied when a current interrupt type ignition control circuit is used.

  INDUSTRIAL APPLICABILITY The present invention is particularly useful for a battery-less ignition device that drives a microcomputer with an output of a power supply circuit that generates a constant DC voltage using a generator driven by an engine as a power source. Even in the ignition device to be supplied, after the microcomputer power supply is established and the microcomputer is activated, the starter motor is driven and the initial ignition operation is performed before the reading of the data stored in the external memory is completed. There is a risk that data may be altered by ignition noise. Therefore, the present invention is also effective when power is supplied from the battery to the microcomputer.

  Although FIG. 1 shows a configuration of an ignition device that ignites one cylinder of the internal combustion engine, it is needless to say that the present invention can be applied to an ignition device that ignites a multi-cylinder internal combustion engine.

It is the circuit diagram which showed the structural example of the hardware used by embodiment of this invention. 6 is a flowchart showing an algorithm of tasks executed for performing initial setting and reading of necessary data immediately after the power supply of the microcomputer is established in the embodiment of the present invention. 6 is a flowchart showing an algorithm of tasks executed for performing initial setting, reading of necessary data, etc. immediately after the power supply of the microcomputer is established in another embodiment of the present invention. It is the flowchart which showed the algorithm of the task performed in order to perform initial setting, reading of required data, etc. immediately after the power supply of a microcomputer was established in the conventional ignition device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet type AC generator 3 Booster circuit 4 Power supply circuit 5 Ignition coil 6 Ignition control circuit 7 Microcomputer 8 External memory 9 Waveform shaping circuit 10 External sensor 11 External sensor

Claims (4)

An ignition control circuit for controlling a primary current of the ignition coil so as to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given; A signal generator that generates a crank angle detection signal at a predetermined crank angle position as an ignition position, and an initial ignition signal supply that provides an ignition signal to the ignition control circuit when the signal generator generates a crank angle detection signal A circuit, an external memory storing data used to calculate the ignition position of the internal combustion engine, an external memory data reading means for reading data stored in the external memory when the internal combustion engine is started, and a read from the external memory Ignition position control means for calculating an ignition position of the internal combustion engine using data and providing an ignition signal to the ignition control circuit at the calculated ignition position; In an internal combustion engine ignition system that includes a microcomputer which formed,
An initial stage for preventing an ignition signal from being supplied from the initial ignition signal supply circuit to the ignition control circuit until the external memory reading means completes reading of the data stored in the external memory when the internal combustion engine is started. Having ignition signal blocking means;
An ignition device for an internal combustion engine. An ignition control circuit for controlling a primary current of the ignition coil so as to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given; A signal generator that generates a crank angle detection signal at a predetermined crank angle position as an ignition position, and an initial ignition signal supply that provides an ignition signal to the ignition control circuit when the signal generator generates a crank angle detection signal A circuit, an external sensor for detecting a control condition used for calculating the ignition position of the internal combustion engine, a control condition reading means for reading the control condition detected by the external sensor, and a control condition read by the control condition reading means And an ignition position control means for providing an ignition signal to the ignition control circuit at the calculated ignition position using the ignition position of the internal combustion engine. In an internal combustion engine ignition system that includes a black computer,
Initial ignition signal blocking means for blocking an ignition signal from being supplied from the initial ignition signal supply circuit to the ignition control circuit until the control condition reading means completes reading of the control conditions before starting the internal combustion engine; Equipped,
An ignition device for an internal combustion engine. An ignition control circuit for controlling a primary current of the ignition coil so as to induce a high voltage for ignition in a secondary coil of the ignition coil when an ignition signal is given; A signal generator that generates a crank angle detection signal at a predetermined crank angle position as an ignition position, and an initial ignition signal supply that provides an ignition signal to the ignition control circuit when the signal generator generates a crank angle detection signal A circuit, an external memory storing data used for calculating the ignition position of the internal combustion engine, an external sensor for detecting a control condition used for calculating the ignition position of the internal combustion engine, and the external memory when starting the internal combustion engine External memory data reading means for reading stored data, control condition reading means for reading control conditions detected by the external sensor, and the external memo Ignition position control means for giving an ignition signal to the ignition control circuit at an ignition position calculated by calculating the ignition position of the internal combustion engine using the data read from the control condition and the control condition read by the control condition reading means. In an internal combustion engine ignition device comprising a microcomputer to be configured,
The initial ignition signal supply circuit until the external memory reading means completes reading of data stored in the external memory before starting the internal combustion engine and the control condition reading means completes reading of the control conditions. An initial ignition signal blocking means for blocking an ignition signal from being applied to the ignition control circuit;
An ignition device for an internal combustion engine. 4. The microcomputer according to claim 1, wherein the microcomputer is provided with a power supply voltage from a power supply circuit that outputs a constant voltage using a generator driven by the internal combustion engine as a power supply. An ignition device for an internal combustion engine according to 1.

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