Method for solving ECU signal interference problem of high-voltage package and sensor integrated structure

Abstract

The application provides an ECU signal interference problem solving method of a high-pressure package and a sensor integrated structure, which is used for solving signal interference of an integrated high-pressure package of a magneto-rotational speed sensor on an engine ECU of a gasoline engine, and is characterized in that: the solving method adds a signal filtering circuit for limiting transient voltage of an operation process of the integrated high-pressure package to the ECU, and improves an ECU signal processing algorithm, dynamically adjusts filtering parameters according to signal characteristics of the integrated high-pressure package collected by the ECU, and improves accuracy of ECU signal processing; and the application can effectively solve the problem of ECU signal interference of the integrated high-pressure package and the magneto-rotational speed sensor in an actual application scene.

Description

Technical Field

[0001] The present invention relates to the technical field of gasoline engine electronic injection, in particular to a solution to the problem of ECU signal interference with a high-voltage package and a sensor integrated structure. Background Art

[0002] In modern gasoline engine control systems, the integrated design of an inductive high-voltage transformer and a magnetoelectric sensor has become a popular trend. This design not only simplifies the engine structure and improves system integration, but also helps enhance engine performance and efficiency. However, this integrated design also brings some challenges, the most prominent of which is signal interference with the engine control unit (ECU).

[0003] The vast majority of conventional carburetor-based (non-EFI) engines utilize an integrated high-voltage package and sensor (the package and sensor are combined into one, hereinafter referred to as an integrated package). This integrated package allows for a more compact structure, facilitating installation within the entire engine. This is particularly true for twin-cylinder engines, which, due to structural limitations, cannot accommodate a separate package and sensor for each cylinder (they are separated, hereinafter referred to as a split package). Therefore, twin-cylinder engines must utilize an integrated package.

[0004] Using an integrated high-voltage package on a general-purpose machine with an electronic fuel injection system will cause the prominent problem of signal interference.

[0005] The patent of this invention aims to effectively solve the problem of interference to ECU signals in actual application scenarios after the high-voltage transformer and magnetoelectric sensor are integrated into one. Summary of the Invention

[0006] The present invention proposes a solution to the ECU signal interference problem of a high-voltage package and a sensor integrated structure, which can effectively solve the problem of ECU signal interference caused by the high-voltage package and the magnetoelectric sensor being integrated into one in actual application scenarios.

[0007] The present invention adopts the following technical solutions.

[0008] A solution to the ECU signal interference problem of an integrated high-voltage package and sensor structure is used to resolve the signal interference caused by the integrated high-voltage package of a gasoline engine using an integrated magnetoelectric speed sensor on the engine ECU. The solution adds a signal filtering circuit to the ECU to limit the transient voltage of the integrated high-voltage package during its operation, and through an improved ECU signal processing algorithm, dynamically adjusts the filtering parameters according to the signal characteristics generated by the integrated high-voltage package collected by the ECU, thereby improving the accuracy of ECU signal processing.

[0009] In the integrated high-voltage package, the magnetoelectric speed sensor is arranged at the lower end of the high-voltage package; the magnetoelectric speed sensor is adjacent to the upper end of the engine magnetic cylinder; when the ECU collects signals from the integrated high-voltage package, the ECU signal processing algorithm is used for filtering. The method is as follows: after the engine starter motor is powered on, the engine magnetic cylinder is driven to rotate, so that the sensor in the integrated high-voltage package collects signals. The outer contour of the magnetic cylinder is divided into 24 equal parts and 23 teeth (narrow teeth) are evenly distributed. The sensor uses the missing 1 tooth signal in the signal collection data as the starting point of the magnetic cylinder rotation, that is, the wide tooth signal is not counted. Under normal circumstances, the sensor collects data for one rotation of the magnetic cylinder. During the sensor acquisition process, the ECU signal processing algorithm is used to calculate the time corresponding to each tooth in the acquired data, that is, the duration from the current rising edge to the next rising edge of the signal waveform. If the signal duration of a certain tooth is less than the preset duration threshold during the data acquisition process, the signal is determined to be a transient voltage crosstalk signal generated by the ignition of the high-voltage package and the signal data will be discarded to improve the accuracy of the ECU signal processing and enable the ECU to normally identify the engine status; the preset duration threshold is set according to the interference pulse time actually collected during the engine operation process and the speed frequency range during the engine operation process.

[0010] A high-voltage line with a high-voltage cap is led out from the side end of the high-voltage package; a shell capable of shielding electromagnetic waves is provided at the high-voltage cap to prevent electromagnetic clutter during operation of the high-voltage line from interfering with the ECU or the magnetoelectric speed sensor.

[0011] The solution adds a signal filtering circuit to the ECU, including a resistor added to the ECU circuit board for voltage division or current limiting of the transient voltage during the ignition process of the high-voltage package.

[0012] In the ECU, the output end of the signal filtering circuit is connected to the MCU via a shaping comparison circuit and a secondary RC low-pass filtering circuit.

[0013] The signal filtering circuit processes the differential signal transmitted by the differential signal line, and performs filtering in the signal transmission direction by sequentially arranged first module, second module, third module, and fourth module;

[0014] The first module includes differential signal line grounding capacitors C_VRS+_IN and C_VRS-_IN provided at the differential signal line, for filtering out common mode interference signals of the differential signal;

[0015] The second module includes a capacitor CF_1 connected between the differential signal lines, for filtering out differential mode interference signals on the differential signal;

[0016] The third module includes an RC filter circuit connected between the differential signal lines, the RC filter circuit includes a parallel circuit consisting of RF_1 and RF_2 and CF_2 connected in series with the parallel circuit, for filtering out high-frequency interference signals;

[0017] The fourth module includes a first-level RC low-pass filter circuit consisting of R_VRS+, C_VRS+_out, R_VRS-, and C_VRS-_out.

[0018] The secondary RC low-pass filter circuit is designed according to the frequency range of the high-voltage package interference signal and the frequency range of the normal engine signal, and performs filtering again.

[0019] The present invention can effectively solve the problem of interference to ECU signals in actual application scenarios after the high-voltage transformer and the magnetoelectric sensor are integrated into one. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Attachment Figure 1 Schematic diagram of signal filtering processing of the ECU of the present invention;

[0022] Attachment Figure 2 This is a schematic diagram of an integrated electromagnetic shielding structure at an integrated high-voltage package according to the present invention;

[0023] Attachment Figure 3 It is a comparison diagram of the normal signal and the interference (error) signal received by the ECU;

[0024] Attachment Figure 4 It is a schematic diagram of the signal filtering circuit;

[0025] Attachment Figure 5 This is a schematic diagram of the connection principle between the signal filtering circuit in the ECU and the external circuit;

[0026] Attachment Figure 6 This is a flow chart of the ECU signal processing algorithm when performing filtering; DETAILED DESCRIPTION

[0027] As shown in the figure, a solution to the ECU signal interference problem of the integrated structure of the high-voltage package and sensor is used to solve the signal interference generated by the integrated high-voltage package of the gasoline engine using the integrated magnetoelectric speed sensor on the engine ECU. The solution adds a signal filtering circuit to the ECU to limit the transient voltage of the integrated high-voltage package during the working process. Through the improved ECU signal processing algorithm, the filtering parameters are dynamically adjusted according to the signal characteristics generated by the integrated high-voltage package collected by the ECU, thereby improving the accuracy of ECU signal processing.

[0028] In the integrated high-voltage package, the magnetoelectric speed sensor is arranged at the lower end of the high-voltage package; the magnetoelectric speed sensor is adjacent to the upper end of the engine magnetic cylinder; when the ECU collects signals from the integrated high-voltage package, the ECU signal processing algorithm is used for filtering. The method is as follows: after the engine starter motor is powered on, the engine magnetic cylinder is driven to rotate, so that the sensor in the integrated high-voltage package collects signals. The outer contour of the magnetic cylinder is divided into 24 equal parts and 23 teeth (narrow teeth) are evenly distributed. The sensor uses the missing 1 tooth signal in the signal collection data as the starting point of the magnetic cylinder rotation, that is, the wide tooth signal is not counted. Under normal circumstances, the sensor collects data for one rotation of the magnetic cylinder. During the sensor acquisition process, the ECU signal processing algorithm is used to calculate the time corresponding to each tooth in the acquired data, that is, the duration from the current rising edge to the next rising edge of the signal waveform. If the signal duration of a certain tooth is less than the preset duration threshold during the data acquisition process, the signal is determined to be a transient voltage crosstalk signal generated by the ignition of the high-voltage package and the signal data will be discarded to improve the accuracy of the ECU signal processing and enable the ECU to normally identify the engine status; the preset duration threshold is set according to the interference pulse time actually collected during the engine operation process and the speed frequency range during the engine operation process.

[0029] A high-voltage line with a high-voltage cap is led out from the side end of the high-voltage package; a shell capable of shielding electromagnetic waves is provided at the high-voltage cap to prevent electromagnetic clutter during operation of the high-voltage line from interfering with the ECU or the magnetoelectric speed sensor.

[0030] The solution adds a signal filtering circuit to the ECU, including a resistor added to the ECU circuit board for voltage division or current limiting of the transient voltage during the ignition process of the high-voltage package.

[0031] In the ECU, the output end of the signal filtering circuit is connected to the MCU via a shaping comparison circuit and a secondary RC low-pass filtering circuit.

[0032] The signal filtering circuit processes the differential signal transmitted by the differential signal line, and performs filtering in the signal transmission direction by sequentially arranged first module, second module, third module, and fourth module;

[0033] The first module includes differential signal line grounding capacitors C_VRS+_IN and C_VRS-_IN provided at the differential signal line, for filtering out common mode interference signals of the differential signal;

[0034] The second module includes a capacitor CF_1 connected between the differential signal lines, for filtering out differential mode interference signals on the differential signal;

[0035] The third module includes an RC filter circuit connected between the differential signal lines, the RC filter circuit includes a parallel circuit consisting of RF_1 and RF_2 and CF_2 connected in series with the parallel circuit, for filtering out high-frequency interference signals;

[0036] The fourth module includes a first-level RC low-pass filter circuit consisting of R_VRS+, C_VRS+_out, R_VRS-, and C_VRS-_out.

[0037] The secondary RC low-pass filter circuit is designed according to the frequency range of the high-voltage package interference signal and the frequency range of the normal engine signal, and performs filtering again.

Claims

1. Solution to ECU signal interference problem with high-voltage package and sensor integrated structure. The high-voltage package and sensor integrated structure is an integrated high-voltage package with an integrated magnetoelectric speed sensor, which is used to solve the signal interference caused by the engine ECU. It is characterized by: The solution adds a signal filtering circuit to the ECU to limit the transient voltage of the integrated high-voltage package during operation. The improved ECU signal processing algorithm dynamically adjusts the filtering parameters based on the signal characteristics generated by the integrated high-voltage package collected by the ECU, thereby improving the accuracy of ECU signal processing. In the integrated high-voltage transformer, a magnetoelectric speed sensor is disposed at the lower end of the high-voltage transformer; the magnetoelectric speed sensor is adjacent to the upper end of the engine magnetic cylinder; when the ECU collects signals from the integrated high-voltage transformer, the ECU uses an ECU signal processing algorithm for filtering, the method being as follows: after the engine starter motor is powered on, the engine magnetic cylinder is driven to rotate, causing the sensor in the integrated high-voltage transformer to collect signals; the outer contour of the magnetic cylinder is evenly distributed with 23 teeth divided into 24 equal parts; the sensor uses the missing signal of one tooth in the signal collection data as the starting point for the magnetic cylinder rotation, and causes the magnetic cylinder to rotate one circle; under normal circumstances, the sensor collects data for the signal collected from 23 teeth; during the sensor collection process, the ECU signal processing algorithm is used to calculate the time corresponding to each tooth in the collected data, that is, the time length from the current rising edge to the next rising edge of the signal waveform; if the signal length of a tooth during the data collection process is less than a preset time length threshold, the signal is determined to be a transient voltage crosstalk signal generated by the high-voltage transformer ignition and the signal data is discarded to improve the accuracy of the ECU signal processing and enable the ECU to normally identify the engine status; the preset time length threshold is set based on the interference pulse time actually collected during the engine operation process and the speed frequency range during the engine operation process; The solution adds a signal filtering circuit to the ECU, including a resistor added to the ECU circuit board for voltage division or current limiting of the transient voltage during the ignition process of the high-voltage package; In the ECU, the output end of the signal filtering circuit is connected to the MCU via a shaping comparison circuit and a secondary RC low-pass filtering circuit; The signal filtering circuit processes the differential signal transmitted by the differential signal line, and performs filtering in the signal transmission direction by sequentially arranged first module, second module, third module, and fourth module; The first module includes differential signal line grounding capacitors C_VRS+_IN and C_VRS-_IN provided at the differential signal line, for filtering out common mode interference signals of the differential signal; The second module includes a capacitor CF_1 connected between the differential signal lines, for filtering out differential mode interference signals on the differential signal; The third module includes an RC filter circuit connected between the differential signal lines, the RC filter circuit includes a parallel circuit consisting of RF_1 and RF_2 and CF_2 connected in series with the parallel circuit, for filtering out high-frequency interference signals; The fourth module includes a first-level RC low-pass filter circuit consisting of R_VRS+, C_VRS+_out, R_VRS-, and C_VRS-_out; The secondary RC low-pass filter circuit is designed according to the frequency range of the high-voltage package interference signal and the frequency range of the normal engine signal, and performs filtering again.

2. The solution to the ECU signal interference problem of the high-voltage transformer and sensor integrated structure according to claim 1 is characterized by: A high-voltage line with a high-voltage cap is led out from the side end of the high-voltage package; a shell capable of shielding electromagnetic waves is provided at the high-voltage cap to prevent electromagnetic clutter during operation of the high-voltage line from interfering with the ECU or the magnetoelectric speed sensor.

Images