Double-end ignition coil cylinder judgment detection feedback circuit

Abstract

The invention discloses a double-end ignition coil cylinder judgment detection feedback circuit. A power supply module is used for processing an input power supply and providing working voltage and reference voltage for the circuit; the EST signal processing module is used for integrating and processing the two paths of EST ignition control signals and then generating a first trigger control signal and a second trigger control signal; the ignition induction signal processing module latches the first logic signal under the control of the first trigger control signal to obtain a first state signal, and generates a second state signal according to the EST ignition control signal; and the signal feedback module is used for performing combined processing on the first state signal and the second state signal under the control of the second trigger control signal and outputting a feedback signal to the ECU for cylinder judgment detection and / or ignition state detection. According to the invention, cylinder judgment detection and / or ignition state detection are / is realized, the detection reliability is improved, the engine operation is optimized, and the failure risk and maintenance cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of cylinder detection feedback technology for automotive ignition modules, and more particularly to a dual-head ignition coil cylinder detection feedback circuit. Background Technology

[0002] In the electronic ignition control system of an automotive engine, the ECU (Electronic Control Unit) controls the on / off of the ignition IGBT. That is, the ECU's EST ignition control signal drives the ignition IGBT to turn on and off via the ignition module, thereby controlling the ignition coil to ignite.

[0003] Dual-ended ignition coils are used in even-numbered cylinder engines. Each end of the secondary winding is connected to two spark plugs from each cylinder, often employing a "dual-cylinder simultaneous ignition" design. This design eliminates the energy loss associated with the distributor and high-voltage wires, avoids electromagnetic interference, and results in a more reliable and stable structure. Taking a four-cylinder engine as an example, of the two cylinders synchronized to top dead center, one is in the compression stroke (effective ignition) with a high spark plug breakdown voltage; the other is in the exhaust stroke (ineffective ignition) with a low spark plug breakdown voltage. Therefore, the ECU needs feedback signals after ignition to identify the compression ignition cylinder and detect ignition anomalies. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-head ignition coil cylinder detection feedback circuit to realize cylinder detection and / or ignition status detection, improve detection reliability, optimize engine operation, and reduce failure risk and maintenance costs.

[0005] To achieve the above objectives, the following technical solution is adopted: A dual-headed ignition coil cylinder detection feedback circuit includes a power supply module, an EST signal processing module, an ignition sensing signal processing module, and a signal feedback module. The power supply module processes the input power and provides the circuit with operating voltage and a reference voltage. The EST signal processing module integrates and processes two EST ignition control signals to generate a first trigger control signal and a second trigger control signal. The ignition sensing signal processing module receives and processes the secondary sensing signal from the ignition coil to obtain a first logic signal, and latches the first logic signal under the control of the first trigger control signal to obtain a first state signal, while simultaneously generating a second state signal based on the EST ignition control signal. The signal feedback module, under the control of the second trigger control signal, combines the first and second state signals and outputs a feedback signal to the ECU for cylinder detection and / or ignition status detection.

[0006] Preferably, the EST signal processing module includes a first anti-reverse diode and a second anti-reverse diode; the first anti-reverse diode and the second anti-reverse diode are each used to receive one EST ignition control signal, and the two EST ignition control signals are merged and output to the comparison processing node.

[0007] Preferably, the EST signal processing module further includes a first comparator, a second comparator, and a third comparator; the non-inverting input of the first comparator is used to receive the combined EST ignition control signal, and the inverting input of the first comparator is used to receive the reference voltage provided by the power supply module; the first trigger control signal is generated by the second comparator, which takes the output of the first comparator as input and compares it with the reference voltage provided by the power supply module before outputting the signal; the second trigger control signal is generated by the third comparator, which takes the output of the first comparator as input and compares it with the reference voltage provided by the power supply module before outputting the signal.

[0008] Preferably, the first comparator is provided with a first positive feedback loop to form a hysteresis comparison, and outputs the comparison result through a first pull-up resistor.

[0009] Preferably, the ignition sensing signal processing module is provided with a secondary sensing signal input terminal of the ignition coil; the ignition sensing signal processing module includes a fourth comparator and a first flip-flop; the inverting input terminal of the fourth comparator is used to receive the secondary sensing signal of the ignition coil, the non-inverting input terminal of the fourth comparator is used to receive the reference voltage provided by the power supply module, and the output terminal of the fourth comparator is connected to the data signal input terminal of the first flip-flop; the trigger control terminal of the first flip-flop is used to receive a first trigger control signal, and the output terminal of the first flip-flop is used to output a first status signal.

[0010] Preferably, the fourth comparator is provided with a second positive feedback loop to form a hysteresis comparison, and outputs the comparison result through a second pull-up resistor.

[0011] Preferably, the ignition sensing signal processing module further includes a first switching device and a fifth comparator; the generation path of the second status signal includes: driving the first switching device after voltage division of the EST ignition control signal, so that the EST ignition control signal and the output of the fourth comparator form an isolation / clamp coupling, and the fifth comparator compares the coupling node with the reference voltage provided by the power supply module and outputs the second status signal.

[0012] Preferably, the ignition sensing signal processing module is provided with a first port protection resistor and a first Zener diode at the secondary sensing signal input terminal of the ignition coil to limit the amplitude of the secondary sensing signal, and a first filter capacitor is provided to suppress high-frequency interference.

[0013] Preferably, the signal feedback module includes a sixth comparator, a seventh comparator, a second flip-flop, and a second switching device; the sixth comparator is used to compare the first state signal with the reference voltage provided by the power supply module and output an intermediate signal; the second state signal is gated / combined with the intermediate signal by the second switching device; the second flip-flop latches the intermediate signal under the control of the second trigger control signal and outputs it to the non-inverting input of the seventh comparator; the inverting input of the seventh comparator is used to receive the reference voltage provided by the power supply module, and the output of the seventh comparator is output to the ECU.

[0014] Preferably, the power supply module includes a first TVS diode, a first input filter capacitor, a first output filter capacitor, and a first voltage divider resistor network; the first TVS diode is used for surge / transient protection, and the first voltage divider resistor network is used to generate a reference voltage.

[0015] By adopting the above solution, the beneficial effects of the present invention are: This invention provides a dual-head ignition coil cylinder detection feedback circuit that integrates a power supply module, an EST signal processing module, an ignition sensing signal processing module, and a signal feedback module to process, latch, and combine two EST ignition control signals and the secondary sensing signal of the ignition coil, and outputs a feedback signal after ignition to the ECU. This enables cylinder detection and / or ignition status detection, improves detection reliability, optimizes engine operation, and reduces failure risk and maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the principle of the present invention. Figure 2 This is a circuit diagram of the power supply module of the present invention; Figure 3 This is a circuit diagram of the EST signal processing module of the present invention; Figure 4 This is a circuit diagram of the ignition sensing signal processing module of the present invention; Figure 5 This is a circuit diagram of the signal feedback module of the present invention; Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0017] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0018] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0019] Reference Figures 1 to 5 As shown, this invention provides a dual-head ignition coil cylinder detection feedback circuit, including a power supply module, an EST signal processing module, an ignition sensing signal processing module, and a signal feedback module; wherein: the power supply module is used to process the input power supply and provide the circuit with a working voltage and a reference voltage REF1; the EST signal processing module is used to integrate and process two EST ignition control signals, and then generate a first trigger control signal CP1 and a second trigger control signal CP2; the ignition sensing signal processing module is used to receive the secondary sensing signal of the ignition coil and process it to obtain a first logic signal, and latch the first logic signal under the control of the first trigger control signal CP1 to obtain a first state signal S1, and at the same time generate a second state signal S2 according to the EST ignition control signal; the signal feedback module is used to combine and process the first state signal S1 and the second state signal S2 under the control of the second trigger control signal CP2 and output a feedback signal to the ECU for cylinder detection and / or ignition state detection.

[0020] This invention provides a dual-head ignition coil cylinder detection feedback circuit, which integrates and calculates the EST ignition control signal given by the ECU and the secondary induction signal of the ignition coil, and outputs a feedback signal after ignition to the ECU. The ECU can then determine which cylinder is in compression ignition and which cylinder has an abnormal ignition state, thereby optimizing engine performance, ensuring normal engine operation, and reducing failure risk and maintenance costs.

[0021] Please continue to refer to Figure 1The power supply module, EST signal processing module, ignition sensing signal processing module, and signal feedback module work together. The power supply module supplies power to all modules; the EST signal processing module integrates and processes two EST ignition control signals and outputs them to the ignition sensing signal processing module and the signal feedback module; the ignition sensing signal processing module processes the signal output from the EST signal processing module and the secondary sensing signal from the ignition coil and outputs it to the signal feedback module; the signal feedback module integrates and processes the signals from each module and outputs the feedback signal after ignition for the ECU to detect and determine the cylinder.

[0022] When the ignition coil is working, the secondary induced signal of the ignition coil will jump up and down regularly based on the reference voltage. The feedback circuit provided by this invention will collect the jumping signal of the secondary induced signal of the ignition coil, and perform a series of logical operations through the feedback circuit, and finally output the feedback signal after ignition for the ECU to detect and determine the cylinder.

[0023] Power supply module: Please continue to refer to Figure 2 B+ is connected to the positive terminal of the vehicle power supply, GND is grounded, VCC is the LDO voltage output, and REF1 is the reference voltage REF1.

[0024] The power supply module includes a first TVS diode D1, a first input filter capacitor, a first output filter capacitor, and a first voltage divider resistor network. Further, the first TVS diode D1 is used for surge / transient protection to protect downstream devices; the first input filter capacitor includes capacitors C2 and C10 for power input filtering; the first output filter capacitor includes capacitors C1 and C7 for output filtering; and the first voltage divider resistor network includes resistors R12 and R16 for generating a reference voltage REF1.

[0025] EST signal processing module: Please continue to refer to Figure 3 The EST signal processing module includes a first anti-reverse diode D2 and a second anti-reverse diode D3; the first anti-reverse diode D2 and the second anti-reverse diode D3 are each used to receive one EST ignition control signal, and the two EST ignition control signals are merged and output to the comparison processing node.

[0026] The EST signal processing module further includes a first comparator U6D, a second comparator U6B, and a third comparator U6A. The non-inverting input of the first comparator U6D is used to receive the combined EST ignition control signal, and the inverting input of the first comparator U6D is used to receive the reference voltage REF1 provided by the power supply module. The first trigger control signal CP1 is generated by the second comparator U6B, which takes the output of the first comparator U6D as its input and compares it with the reference voltage REF1 provided by the power supply module before outputting it. The second trigger control signal CP2 is generated by the third comparator U6A, which takes the output of the first comparator U6D as its input and compares it with the reference voltage REF1 provided by the power supply module before outputting it.

[0027] The first anti-reverse diode D2 and the second anti-reverse diode D3 combine the two EST ignition control signals, then ground them through resistor R17 and input them to the non-inverting input of the first comparator U6D through resistor R14. The inverting input of the first comparator U6D is connected to the reference voltage REF1. Capacitors C19, C11, and C4 are filter capacitors. The output of the first comparator U6D is divided into two paths: one path is input to the inverting input of the second comparator U6B through resistor R55. The non-inverting input of the second comparator U6B is connected to the reference voltage REF1. Resistor R52 serves as a pull-up resistor for the output of the second comparator U6B. The output of the second comparator U6B is input to the trigger control terminal CP of the first flip-flop U5 in the ignition sensing signal processing module through resistor R54. The other path is input to the inverting input of the third comparator U6A through resistor R15. The non-inverting input of the third comparator U6A is connected to the reference voltage REF1. Resistor R10 serves as a pull-up resistor for the output of the third comparator U6A. The output of the third comparator U6A is input to the trigger control terminal CP of the second flip-flop U7 in the signal feedback module through resistor R11.

[0028] The first comparator U6D is provided with a first positive feedback loop to form a hysteresis comparison, and outputs the comparison result through a first pull-up resistor. The first positive feedback loop includes a resistor R13, which is a positive feedback resistor to form a hysteresis comparison; at the same time, the first pull-up resistor is a resistor R53, which serves as the pull-up resistor at the output terminal of the first comparator U6D to output the comparison result.

[0029] Ignition sensor signal processing module: Please continue to refer to Figure 4 The ignition sensing signal processing module is provided with a secondary sensing signal input terminal of the ignition coil; INTF is the secondary sensing signal input terminal connected from the high voltage coil, that is, the secondary sensing signal input terminal INTF of the ignition coil.

[0030] The ignition sensing signal processing module includes a fourth comparator U1B and a first flip-flop U5. The inverting input of the fourth comparator U1B receives the secondary induced signal from the ignition coil, and the non-inverting input receives the reference voltage REF1 provided by the power supply module. The output of the fourth comparator U1B is connected to the data signal input of the first flip-flop U5. The trigger control terminal CP of the first flip-flop U5 receives the first trigger control signal CP1, and the output of the first flip-flop U5 outputs a first status signal S1. The output of the fourth comparator U1B is connected to the D terminal of the first flip-flop U5, i.e., connected to the data signal input of the first flip-flop U5. The trigger control terminal CP of the first flip-flop U5 is connected to the first trigger control signal CP1 and outputs the first status signal S1. The secondary induced signal from the ignition coil is input to the inverting input of the fourth comparator U1B through resistor R6, and the non-inverting input of the fourth comparator U1B is connected to the reference voltage REF1.

[0031] The fourth comparator U1B is provided with a second positive feedback loop to form a hysteresis comparison, and outputs the comparison result through a second pull-up resistor. The second positive feedback loop includes a resistor R4, which is a positive feedback resistor to form the hysteresis comparison; simultaneously, the second pull-up resistor is a resistor R1, which serves as the pull-up resistor for the output terminal of the first comparator U6D, outputting the comparison result.

[0032] The ignition sensing signal processing module also includes a first switching device Q3A and a fifth comparator U1A; the generation path of the second status signal S2 includes: dividing the EST ignition control signal to drive the first switching device Q3A, so that the EST ignition control signal and the output of the fourth comparator U1B form an isolation / clamp coupling, and the fifth comparator U1A compares the coupling node with the reference voltage REF1 provided by the power supply module and outputs the second status signal S2. The EST ignition control signal is divided by resistors R51 and R49, and output to the base of the first switching device Q3A through resistor R47. The emitter of the first switching device Q3A is grounded. The collector of the first switching device Q3A is connected to the output of the fourth comparator U1B through the third anti-reverse diode D7, and is simultaneously input to the non-inverting input of the fifth comparator U1A through resistor R48. The inverting input of the fifth comparator U1A is connected to the reference voltage REF1. Resistor R50 is the positive feedback resistor, and resistor R2 is the pull-up resistor for the output of the fifth comparator U1A. The fifth comparator U1A outputs the second status signal S2.

[0033] The ignition sensing signal processing module has a first port protection resistor and a first Zener diode at the secondary sensing signal input terminal of the ignition coil to limit the secondary sensing signal, and a first filter capacitor to suppress high-frequency interference. Specifically, resistor R44 serves as the first port protection resistor, providing current-limiting protection against input surges / impacts; diode D5 serves as the first Zener diode, clamping / limiting the input voltage; capacitor C3 serves as the first filter capacitor, bypassing and filtering input high-frequency spikes to suppress high-frequency interference; and resistors R3 and R7 are connected in series to form a voltage reference platform.

[0034] Signal feedback module: Please continue to refer to Figure 5 The signal feedback module includes a sixth comparator U1D, a seventh comparator U1C, a second flip-flop U7, and a second switching device Q3B. The sixth comparator U1D compares the first state signal S1 with the reference voltage REF1 provided by the power supply module and outputs an intermediate signal. The second state signal S2 is gated / combined with the intermediate signal by the second switching device Q3B. The second flip-flop U7 latches the intermediate signal under the control of the second trigger control signal CP2 and outputs it to the non-inverting input of the seventh comparator U1C. The inverting input of the seventh comparator U1C is used to receive the reference voltage REF1 provided by the power supply module, and the output of the seventh comparator U1C is output to the ECU.

[0035] The non-inverting input of the sixth comparator U1D is connected to the reference voltage REF1, and the inverting input is connected to the first state signal S1. Resistor R9 is the pull-up resistor for the output of the sixth comparator U1D. The second state signal S2 is output to the base of the second switching device Q3B through resistor R46. The collector of the second switching device Q3B is grounded, and the emitter of the second switching device Q3B is connected to the output of the sixth comparator U1D. The output of the sixth comparator U1D is input to the D terminal of the second flip-flop U7 through resistor R45, which is connected to the data signal input terminal of the second flip-flop U7. The trigger control terminal CP of the second flip-flop U7 is connected to the second trigger control signal CP2. The output of the second flip-flop U7 is the non-inverting input signal of the seventh comparator U1C. The inverting input of the seventh comparator U1C is connected to the reference voltage REF1, and resistor R43 is the pull-up resistor for the output of the seventh comparator U1C. Zener diode D4 regulates and limits the feedback output signal, and resistor R8 is the protection resistor for the output of the seventh comparator U1C.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. Obviously, the above embodiments of the present invention are merely examples to clearly illustrate the present invention and are not intended to limit the implementation of the present invention. For those skilled in the art, various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A dual-head ignition coil cylinder detection feedback circuit, characterized in that, The circuit comprises a power supply module, an EST signal processing module, an ignition induction signal processing module and a signal feedback module. The power supply module is configured to process an input power supply and provide working voltage and reference voltage for the circuit. The EST signal processing module is configured to integrate and process two EST ignition control signals, and then generate a first trigger control signal and a second trigger control signal. The ignition induction signal processing module is configured to receive and process a secondary induction signal of an ignition coil to obtain a first logic signal, and latch the first logic signal under the control of the first trigger control signal to obtain a first state signal, and generate a second state signal according to the EST ignition control signal. The signal feedback module is configured to combine and process the first state signal and the second state signal under the control of the second trigger control signal, and output a feedback signal to an ECU for cylinder detection and / or ignition state detection.

2. The dual plug ignition coil secondary detection feedback circuit of claim 1, wherein, The EST signal processing module comprises a first anti-reverse diode and a second anti-reverse diode, which are configured to be connected to two EST ignition control signals respectively, and to combine and output the two EST ignition control signals to a comparison processing node.

3. The dual plug ignition coil secondary detection feedback circuit of claim 2, wherein, The EST signal processing module further comprises a first comparator, a second comparator and a third comparator, the non-inverting input end of the first comparator is configured to receive the combined EST ignition control signal, the inverting input end of the first comparator is configured to receive the reference voltage provided by the power supply module, the first trigger control signal is generated by the second comparator, the output of the first comparator is input into the second comparator and compared with the reference voltage provided by the power supply module, and then the output is output, and the second trigger control signal is generated by the third comparator, the output of the first comparator is input into the third comparator and compared with the reference voltage provided by the power supply module, and then the output is output.

4. The dual plug ignition coil secondary detection feedback circuit of claim 3, wherein, The first comparator is provided with a first positive feedback loop to form a hysteresis comparison, and the comparison result is output through a first pull-up resistor.

5. The dual plug ignition coil secondary detection feedback circuit of claim 1, wherein, The ignition induction signal processing module is provided with a secondary induction signal input end of an ignition coil, and comprises a fourth comparator and a first flip-flop, the inverting input end of the fourth comparator is configured to receive the secondary induction signal of the ignition coil, the non-inverting input end of the fourth comparator is configured to receive the reference voltage provided by the power supply module, and the output end of the fourth comparator is connected with the data signal input end of the first flip-flop, the trigger control end of the first flip-flop is configured to receive the first trigger control signal, and the output end of the first flip-flop is configured to output the first state signal.

6. The dual plug ignition coil secondary detection feedback circuit of claim 5, wherein, The fourth comparator is provided with a second positive feedback loop to form a hysteresis comparison, and the comparison result is output through a second pull-up resistor.

7. The dual plug ignition coil secondary detection feedback circuit of claim 5, wherein, The ignition induction signal processing module further comprises a first switching device and a fifth comparator, and the generation path of the second state signal comprises: driving the first switching device after voltage division of the EST ignition control signal, so that the EST ignition control signal and the output of the fourth comparator form an isolation / clamping coupling, and the fifth comparator compares the coupling node with the reference voltage provided by the power supply module and then outputs the second state signal.

8. The dual plug ignition coil secondary detection feedback circuit of claim 5, wherein, The ignition induction signal processing module is provided with a first port protection resistor and a first voltage stabilizing diode at an ignition coil secondary induction signal input end to limit the amplitude of the secondary induction signal, and is provided with a first filter capacitor to suppress high frequency interference.

9. The dual plug ignition coil secondary detection feedback circuit of claim 1, wherein, The signal feedback module comprises a sixth comparator, a seventh comparator, a second flip-flop and a second switching device; the sixth comparator is used for comparing the first state signal with a reference voltage provided by the power supply module to output an intermediate signal; the second state signal is used for gating / combining the intermediate signal through the second switching device; the second flip-flop is used for latching the intermediate signal under the control of a second trigger control signal and outputting to a non-inverting input end of the seventh comparator; an inverting input end of the seventh comparator is used for receiving the reference voltage provided by the power supply module, and an output end of the seventh comparator is output to the ECU.

10. The dual plug ignition coil secondary detection feedback circuit of claim 1, wherein, The power supply module comprises a first TVS diode, a first input end filter capacitor, a first output end filter capacitor and a first voltage dividing resistor network; the first TVS diode is used for surge / transient protection, and the first voltage dividing resistor network is used for generating the reference voltage.

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