Ignition coil control module with monitoring and fault feedback functions

Abstract

The utility model relates to an ignition coil control module with monitoring and fault feedback functions, which comprises a power supply circuit, a logic circuit, a feedback circuit, a data processing circuit and a sampling circuit, the power supply circuit respectively supplies power to the logic circuit, the data processing circuit and a primary loop of an ignition coil, an ignition signal pin EST is electrically connected with the logic circuit, and the sampling circuit is electrically connected with the data processing circuit. The output end of the logic circuit controls on-off of a primary loop of an ignition coil through an IGBT Q1, the sampling circuit is connected in series in the primary loop of the ignition coil, the two ends of the sampling circuit are electrically connected with the input end of the data processing module respectively, the output end of the data processing circuit is electrically connected with the feedback circuit, and the feedback circuit is electrically connected with an ignition signal pin EST. The utility model has the advantages that when the current is abnormal, the current of the EST is jumped through the feedback circuit, so that the ECU can analyze the state of the primary loop of the coil and further determine whether a fault exists or not.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile ignition coil electronic control, in particular to an ignition coil control module with monitoring and fault feedback functions. Background Art

[0002] At present, ignition coils with control functions have emerged according to the differences in ECU function models and vehicle requirements. These control modules control the on and off of the IGBT based on the high and low levels of the control signals input by the ECU, so that an induced electromotive force with a sudden current change is generated on the primary coil at the load end, and then a high voltage is induced in the secondary coil through mutual inductance to break down the spark plug. However, the existing control modules do not have the function of real-time monitoring of the primary coil status of the ignition coil and feedback of fault information. Summary of the invention

[0003] The utility model mainly solves the above problems and provides an ignition coil control module with monitoring and fault feedback functions.

[0004] The utility model adopts a technical solution to solve its technical problems. An ignition coil control module with monitoring and fault feedback functions is arranged between the ignition signal pin EST of the ECU and the primary circuit of the ignition coil. The ECU detects the current change of the ignition signal pin EST in real time. The module comprises a power supply circuit, a logic circuit, a feedback circuit, a data processing circuit and a sampling circuit. The power supply circuit supplies power to the logic circuit, the data processing circuit and the primary circuit of the ignition coil respectively. The ignition signal pin EST is electrically connected to the logic circuit. The output end of the logic circuit controls the on-off of the primary circuit of the ignition coil through IGBT Q1. The sampling circuit is connected in series in the primary circuit of the ignition coil. The two ends of the sampling circuit are electrically connected to the input end of the data processing module respectively. The output end of the data processing circuit is electrically connected to the feedback circuit. The feedback circuit is electrically connected to the ignition signal pin EST.

[0005] As a preferred embodiment of the above scheme, the logic circuit includes comparators U1A, U1B and capacitor C5, the ignition signal pin EST is connected to the positive input terminal of comparator U1A, the output terminal of comparator U1A is connected to the positive input terminal of comparator U1B through capacitor C5, the output terminal of comparator U1B is connected to the gate of IGBT Q1, the IGBT Q1 controls the on and off of the primary circuit of the ignition coil, and the power supply circuit is respectively connected to the inverting input terminals of comparator U1A and comparator U1B.

[0006] As a preferred embodiment of the above scheme, the data processing circuit includes an operational amplifier U3 and a comparator U2, the non-phase input terminal and the inverting input terminal of the operational amplifier U3 are respectively connected to the two ends of the sampling circuit, the output terminal of the operational amplifier U3 is connected to the inverting input terminal of the comparator U2, the non-phase input terminal of the comparator U2 is connected to the power supply circuit, and the output terminal of the comparator U2 is connected to the feedback circuit.

[0007] As a preferred embodiment of the above scheme, the feedback circuit includes a MOS tube Q2, a resistor R12 and a resistor R32. The parallel circuit composed of the resistor R12 and the resistor R32 is connected in series between the ignition signal pin EST and the drain of the MOS tube. The gate of the MOS tube Q2 is connected to the output end of the data processing circuit, and the source of the MOS tube Q2 is grounded.

[0008] As a preferred embodiment of the above scheme, the power supply circuit includes a voltage regulator tube D1, a current limiting resistor, a plurality of filter capacitors and a power supply VBAT. The power supply VBAT is connected to the cathode of the voltage regulator tube D1 through the current limiting resistor. The anode of the voltage regulator tube D1 is grounded. The cathode of the voltage regulator tube D1 supplies power to the primary circuit of the logic circuit, the data processing circuit and the ignition coil.

[0009] The utility model has the advantages that: a sampling circuit is provided to detect the current of the primary circuit in the ignition coil in real time, and when the current is abnormal, the current of the ignition signal pin EST is changed through the feedback circuit so that the ECU can analyze the state of the primary circuit of the coil and further determine whether there is a fault; without adding connector pins, the ignition signal pin EST that can only receive control signals in one direction is changed into a two-way information transmission pin that can both receive and process ECU control signals and can provide real-time feedback on the working state of the ignition coil through current changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the circuit schematic of the ignition coil control module. DETAILED DESCRIPTION

[0011] The technical solution of the utility model is further described below through embodiments and in conjunction with the accompanying drawings.

[0012] Example:

[0013] This embodiment provides an ignition coil control module with monitoring and fault feedback functions, which is arranged between the ignition signal pin EST of the ECU and the primary circuit of the ignition coil. Figure 1As shown, it includes a power supply circuit, a logic circuit, a feedback circuit, a data processing circuit and a sampling circuit. The power supply circuit takes power from the positive and negative wiring harnesses of the ECU and regulates the voltage to supply power to the logic circuit, the data processing circuit and the primary circuit of the ignition coil respectively. The ignition signal pin EST is electrically connected to the logic circuit. The output end of the logic circuit controls the on-off of the primary circuit of the ignition coil through the IGBT Q1. The sampling circuit is connected in series in the primary circuit of the ignition coil. Both ends of the sampling circuit are electrically connected to the input end of the data processing module respectively. The output end of the data processing circuit is electrically connected to the feedback circuit, and the feedback circuit is electrically connected to the ignition signal pin EST.

[0014] The power supply circuit includes a voltage regulator tube D1, a current limiting resistor, a plurality of filter capacitors and a power supply VBAT. The power supply VBAT is connected to the cathode of the voltage regulator tube D1 through the current limiting resistor. The anode of the voltage regulator tube D1 is grounded. The cathode of the voltage regulator tube D1 supplies power to the primary circuit of the logic circuit, the data processing circuit and the ignition coil.

[0015] The logic circuit includes comparators U1A, U1B and capacitor C5, the ignition signal pin EST is connected to the positive input terminal of comparator U1A, the output terminal of comparator U1A is connected to the positive input terminal of comparator U1B through capacitor C5, the output terminal of comparator U1B is connected to the gate of IGBT Q1, IGBT Q1 controls the on and off of the primary circuit of the ignition coil, and the power supply circuit is respectively connected to the inverting input terminals of comparator U1A and comparator U1B. In this embodiment, the logic circuit adopts ON Semiconductor's NCV2903DR2G dual-channel comparator chip, providing a primary comparator U1A and a secondary comparator U1B, and the output of the primary comparator U1A is hysteresis-constructed by a capacitor to construct a time protection circuit, so that when the ignition signal pin EST outputs a high signal for a long time, the secondary comparator U1B can output a low pad signal to turn off the IGBT Q1, so as to prevent the IGBT Q1 from being turned on for a long time and burning the ignition coil. In addition, a number of resistors and capacitors are set in the logic circuit for filtering.

[0016] The data processing circuit includes an operational amplifier U3 and a comparator U2, wherein the non-inverting input terminal and the inverting input terminal of the operational amplifier U3 are respectively connected to the two ends of the sampling circuit, the output terminal of the operational amplifier U3 is connected to the inverting input terminal of the comparator U2, the non-inverting input terminal of the comparator U2 is connected to the power supply circuit, and the output terminal of the comparator U2 is connected to the feedback circuit. In this embodiment, the data processing circuit uses an operational amplifier NCV20071SN2T1G and a comparator NCV391SN2T1G of ON Semiconductor, and uses a Kelvin routing method to amplify the sampling voltage of the sampling circuit through the operational amplifier and then compare it. After reaching the threshold set by the comparator, the comparator output is reversed.

[0017] The feedback circuit includes a MOS tube Q2, a resistor R12 and a resistor R32. The parallel circuit composed of the resistor R12 and the resistor R32 is connected in series between the ignition signal pin EST and the drain of the MOS tube. The gate of the MOS tube Q2 is connected to the output end of the data processing circuit, and the source of the MOS tube Q2 is grounded. The MOS tube Q2 adopts Infineon's BSS806NE H6327. The MOS tube Q2 controls the on-off of a pull-down resistor loop at the end of the ignition signal pin EST. By controlling the on-off of the pull-down loop, the input impedance of the ignition signal pin EST changes, thereby causing the current of the ignition signal pin EST to jump, so that the ECU that detects the current change of the ignition signal pin EST in real time can parse the fault information according to the current jump time of the ignition signal pin EST.

[0018] In this embodiment, when the ignition coil fails, the sampling voltage of the sampling circuit will change, and the output will flip after the reference voltage comparison of the comparator after the operational amplifier gain, so that the MOS tube Q2 changes from on to off, and the pull-down impedance of the ignition signal pin EST changes, so that the pin current jumps. The ECU can analyze whether the primary circuit of the coil is in a short circuit or open circuit state according to the duration of the pin current jump. In addition, the sampling resistor value or the gain multiple of the operational amplifier can be modified to adapt to the matching of ignition coils with different primary currents on the market.

[0019] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An ignition coil control module with monitoring and fault feedback functions, arranged between the ignition signal pin EST of the ECU and the primary circuit of the ignition coil, the ECU detects the current change of the ignition signal pin EST in real time, and is characterized by: It includes a power supply circuit, a logic circuit, a feedback circuit, a data processing circuit and a sampling circuit. The power supply circuit supplies power to the logic circuit, the data processing circuit and the primary circuit of the ignition coil respectively. The ignition signal pin EST is electrically connected to the logic circuit. The output end of the logic circuit controls the on-off of the primary circuit of the ignition coil through IGBT Q1. The sampling circuit is connected in series in the primary circuit of the ignition coil. Both ends of the sampling circuit are electrically connected to the input end of the data processing module respectively. The output end of the data processing circuit is electrically connected to the feedback circuit. The feedback circuit is electrically connected to the ignition signal pin EST.

2. The ignition coil control module with monitoring and fault feedback functions according to claim 1, characterized in that: The logic circuit includes comparators U1A, U1B and capacitor C5. The ignition signal pin EST is connected to the positive input terminal of comparator U1A. The output terminal of comparator U1A is connected to the positive input terminal of comparator U1B through capacitor C5. The output terminal of comparator U1B is connected to the gate of IGBT Q1. IGBT Q1 controls the on-off of the primary circuit of the ignition coil. The power supply circuit is respectively connected to the inverting input terminals of comparator U1A and comparator U1B.

3. The ignition coil control module with monitoring and fault feedback functions according to claim 1, characterized in that: The data processing circuit includes an operational amplifier U3 and a comparator U2, wherein the non-inverting input terminal and the inverting input terminal of the operational amplifier U3 are respectively connected to two ends of the sampling circuit, the output terminal of the operational amplifier U3 is connected to the inverting input terminal of the comparator U2, the non-inverting input terminal of the comparator U2 is connected to the power supply circuit, and the output terminal of the comparator U2 is connected to the feedback circuit.

4. The ignition coil control module with monitoring and fault feedback functions according to claim 1, characterized in that: The feedback circuit includes a MOS tube Q2, a resistor R12 and a resistor R32. The parallel circuit composed of the resistor R12 and the resistor R32 is connected in series between the ignition signal pin EST and the drain of the MOS tube. The gate of the MOS tube Q2 is connected to the output end of the data processing circuit, and the source of the MOS tube Q2 is grounded.

5. The ignition coil control module with monitoring and fault feedback functions according to claim 1, characterized in that: The power supply circuit includes a voltage regulator tube D1, a current limiting resistor, a plurality of filter capacitors and a power supply VBAT. The power supply VBAT is connected to the cathode of the voltage regulator tube D1 through the current limiting resistor. The anode of the voltage regulator tube D1 is grounded. The cathode of the voltage regulator tube D1 supplies power to the primary circuit of the logic circuit, the data processing circuit and the ignition coil.

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