Normalization processing method for multi-mode crank angle signal of diesel engine

Abstract

The invention provides a normalization processing method for a multi-mode crank angle signal of a diesel engine, which comprises the following steps of: receiving an original crank angle signal of the diesel engine, and identifying a signal mode type of the original crank angle signal; according to the identified signal mode type, selecting a corresponding characteristic tooth judgment logic: for a tooth increasing mode, when it is detected that the current tooth gap time is less than or equal to 5 / 8 + / -dynamic correction value of the previous tooth gap time, judging that the next tooth is a characteristic tooth; for the tooth missing mode, when it is detected that the current tooth gap time is larger than or equal to 3 / 2 + / -dynamic correction value of the previous tooth gap time, the next tooth is judged to be the characteristic tooth; generating a TRIG pulse signal based on the characteristic teeth, and complementing the CDMA pulse signal through camshaft phase information at the tooth missing / tooth increasing position; and performing pulse reconstruction on the non-characteristic teeth according to a preset angular domain resolution, and outputting a standardized TRIG pulse signal and a standardized CDMA pulse signal. According to the technical scheme, unified processing and high-precision output of different tooth type signals are achieved through dynamic threshold value judgment, camshaft phase compensation and pulse reconstruction technologies.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engine control, and in particular relates to a normalization processing method for a multi-mode crankshaft angle signal of a diesel engine. Background Art

[0002] Diesel engines are currently one of the main power units and are widely used in various industries of the national economy and the field of national defense. With the rapid development of the economy, more stringent requirements have been put forward for the environmental protection, economy, condition monitoring and fault diagnosis, and intelligence of diesel engines. Combustion process condition monitoring provides an effective monitoring window for performance adjustment, fault diagnosis, and combustion closed-loop control. Users can improve combustion performance by adjusting factors such as intake and exhaust strategies, injection timing, and injection mode; evaluate cylinder air tightness, single-cylinder misfire, and consistency of each cylinder through relevant combustion parameters; participate in combustion closed-loop control to achieve balanced adjustment of each cylinder, etc.

[0003] Diesel engine combustion calculation and analysis require high angular domain accuracy. However, the minimum and maximum speeds of different diesel engines vary significantly. This necessitates high memory usage at low speeds and high real-time response at high speeds for angular domain data acquisition and processing. This requires research into angular domain acquisition and processing algorithms and strategies that combine chip resources and capabilities to ensure that the system's angular domain processing covers the entire high-speed range. The crankshaft angle signal patterns of different diesel engines vary, with common patterns including missing teeth, even teeth, multiple teeth, single teeth, and single teeth combined with even teeth. Designing an angular domain mapping algorithm for each pattern would make the algorithm and subsequent combustion calculations extremely large, resulting in a waste of hardware resources. Therefore, normalizing the various crankshaft angle signal patterns before applying the angular domain mapping algorithm would significantly reduce the complexity of the subsequent angular domain mapping and combustion analysis algorithms.

[0004] Therefore, how to provide a normalized processing method for the multi-mode crankshaft angle signal of a diesel engine that can solve the problems of single mode, poor adaptability, high misjudgment rate, and weak signal completion capability of traditional diesel engine crankshaft angle signal processing has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] An embodiment of the present invention provides a normalized processing method for a multi-mode crankshaft angle signal of a diesel engine, which can solve the problems of single mode, poor adaptability, high misjudgment rate, and weak signal completion capability in traditional diesel engine crankshaft angle signal processing. Through dynamic threshold judgment, camshaft phase compensation, and pulse reconstruction technology, unified processing and high-precision output of different tooth profile signals are achieved.

[0006] In an embodiment of the present invention, a method for normalizing a multi-mode crankshaft angle signal of a diesel engine is provided, comprising:

[0007] S101, receiving an original crankshaft angle signal of a diesel engine, and identifying a type of signal mode thereof, wherein the signal mode types include missing tooth mode, even tooth mode, multi-tooth mode, single tooth mode, and single tooth mode + even tooth mode;

[0008] S102. Select the corresponding characteristic tooth determination logic according to the identified signal pattern type:

[0009] In the tooth-increasing mode, when it is detected that the current tooth gap time is ≤ 5 / 8 of the previous tooth gap time ± the dynamic correction value, the next tooth is determined to be the characteristic tooth;

[0010] For the missing tooth mode, when it is detected that the current tooth gap time is ≥ 3 / 2 of the previous tooth gap time ± the dynamic correction value, the next tooth is determined to be the characteristic tooth;

[0011] S103, generating a TRIG pulse signal based on the characteristic tooth, and complementing the CDMA pulse signal at the tooth missing / added position using the camshaft phase information;

[0012] S104 , reconstructing pulses of non-characteristic teeth according to a preset angular domain resolution, and outputting two standardized signals: a TRIG pulse signal and a CDMA pulse signal.

[0013] Furthermore, the processing of the tooth increasing mode includes:

[0014] When the tooth-increasing signal pattern is identified, a TRIG pulse is generated according to the characteristic tooth, and CDMA pulses are generated for the remaining teeth;

[0015] The missing tooth mode processing includes:

[0016] When a missing tooth signal pattern is identified, a TRIG pulse is generated according to the characteristic tooth, and a CDMA pulse is completed at the missing tooth position;

[0017] The dynamic correction value is based on analyzing historical tooth gap time data and dynamically adjusting the threshold ratio in combination with TPU waveform diagnosis results including at least Gap detection and buffer zone diagnosis, with an adjustment range of ±10%.

[0018] Furthermore, the processing of the even-tooth mode includes:

[0019] The number of main teeth is set according to the synchronization relationship between the diesel engine crankshaft and camshaft;

[0020] Insert virtual CDMA pulses at the even teeth to make the total number of pulses match the number of main teeth;

[0021] The pulse completion logic is verified by three pilot enable / disable bit calculations.

[0022] Furthermore, in the tooth-missing mode processing, when three consecutive tooth clearance time anomalies are detected, the camshaft signal takeover mechanism is triggered, the CDMA pulse is reconstructed through the camshaft phase information, and the FBC cylinder oil balance correction is started.

[0023] Furthermore, a TRIG pulse signal is generated based on the characteristic tooth, and a CDMA pulse signal is supplemented by camshaft phase information at the tooth missing / added position, including:

[0024] The generation timing of the TRIG pulse signal is aligned with the engine compression top dead center (TDC), and the phase deviation is calibrated through the injection parameter calculation module.

[0025] Furthermore, during the CDMA pulse reconstruction process, the pulse interval is dynamically adjusted using the TPU interrupt frequency control mode. When the rotation speed changes by more than ±200 rpm, the mode is switched to the virtual sensor drive mode to maintain pulse uniformity.

[0026] Furthermore, the method further includes:

[0027] The structured data file uses JSON format and contains the following fields: project identification code, segment number, part type identification, processing parameter array, three-dimensional coordinate reference system, and version timestamp.

[0028] Furthermore, the method further includes: an exception handling process;

[0029] When the TPU buffer diagnosis shows that the crankshaft signal synchronization fails, it is forced to switch to single sensor mode;

[0030] In single sensor mode, virtual CDMA pulses are generated based on the camshaft signal and the MAP speed-load model.

[0031] Furthermore, after the standardized signal is output, it is synchronized to the injection timing control module, the rail pressure control module and the combustion analysis module;

[0032] The injection timing control module is used to calculate the three pilot injection enable / disable positions;

[0033] The rail pressure control module is used for speed-load coupling parameter calibration;

[0034] The combustion analysis module is used for cylinder pressure curve angularization and combustion closed-loop control.

[0035] The beneficial effects brought about by the present invention are as follows:

[0036] As can be seen from the above scheme, the embodiment of the present invention provides a normalization processing method for a multi-mode crankshaft angle signal of a diesel engine. The method receives the original crankshaft angle signal of the diesel engine and identifies the type of its signal mode. Based on the identified signal mode type, the corresponding characteristic tooth determination logic is selected: for the tooth increase mode, when the current tooth clearance time is detected to be ≤ 5 / 8 of the previous tooth clearance time ± the dynamic correction value, the next tooth is determined to be a characteristic tooth; for the tooth loss mode, when the current tooth clearance time is detected to be ≥ 3 / 2 of the previous tooth clearance time ± the dynamic correction value, the next tooth is determined to be a characteristic tooth. TRIG pulse signals are generated based on the characteristic teeth, and CDMA pulse signals are supplemented with camshaft phase information at the tooth loss / increase positions. Pulses of non-characteristic teeth are reconstructed according to a preset angular domain resolution, and two standardized signals are output: TRIG pulse signals and CDMA pulse signals. The technical solution of the present invention can solve the problems of traditional diesel engine crankshaft angle signal processing with a single mode, poor adaptability, high misjudgment rate, and weak signal completion capability. Through dynamic threshold determination, camshaft phase compensation, and pulse reconstruction technology, unified processing and high-precision output of different tooth profile signals are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of a method for normalizing a multi-mode crank angle signal of a diesel engine according to an embodiment of the present invention;

[0038] Figure 2 A flowchart of tooth-added and tooth-missing signal normalization of a method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to an embodiment of the present invention;

[0039] Figure 3 A single tooth signal mode normalization flow chart of a method for normalizing a multi-mode crank angle signal of a diesel engine according to an embodiment of the present invention;

[0040] Figure 4 A flowchart of processing a uniform tooth signal mode and a single tooth + uniform tooth signal mode of a normalization processing method for a multi-mode crankshaft angle signal of a diesel engine according to an embodiment of the present invention;

[0041] Figure 5 Schematic diagram of TRIG pulses and 0.1°C DMA pulses in a normalization processing method for a multi-mode crank angle signal of a diesel engine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] like Figure 1 As shown, Figure 1 This is a flow chart of a method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to an embodiment of the present invention.

[0044] Figure 1 A method for normalizing a multi-mode crankshaft angle signal of a diesel engine, comprising:

[0045] S101, receiving an original crankshaft angle signal of a diesel engine, and identifying a type of signal mode thereof, wherein the signal mode types include missing tooth mode, even tooth mode, multi-tooth mode, single tooth mode, and single tooth mode + even tooth mode;

[0046] S102. Select the corresponding characteristic tooth determination logic according to the identified signal pattern type:

[0047] In the tooth-increasing mode, when it is detected that the current tooth gap time is ≤ 5 / 8 of the previous tooth gap time ± the dynamic correction value, the next tooth is determined to be the characteristic tooth;

[0048] For the missing tooth mode, when it is detected that the current tooth gap time is ≥ 3 / 2 of the previous tooth gap time ± the dynamic correction value, the next tooth is determined to be the characteristic tooth;

[0049] S103, generating a TRIG pulse signal based on the characteristic tooth, and complementing the CDMA pulse signal at the tooth missing / added position using the camshaft phase information;

[0050] S104 , reconstructing pulses of non-characteristic teeth according to a preset angular domain resolution, and outputting two standardized signals: a TRIG pulse signal and a CDMA pulse signal.

[0051] In this embodiment of the present invention, dynamic threshold determination, camshaft phase compensation, and pulse reconstruction techniques enable unified processing and high-precision output of signals from different tooth profiles. Characteristic teeth are identified based on the dynamic correction value of tooth clearance time, enabling multi-mode signal recognition and dynamic determination. Camshaft phase information is used to complement CDMA pulses at missing / added tooth locations, achieving signal completion and reconstruction. Two standardized signals, TRIG and CDMA, are generated using a preset angular resolution, adapted to the diesel engine control module for standardized signal output.

[0052] The technical solution of the present invention supports automatic recognition and processing of five signal modes (missing teeth, even teeth, multiple teeth, single tooth, single tooth + even teeth), improving compatibility by 80%; the dynamic correction value introduces a ±10% adjustment range (based on historical data and TPU waveform diagnosis) to reduce the characteristic tooth misjudgment rate caused by speed fluctuations (the traditional static threshold misjudgment rate is reduced by 60%); through the standardized output of TRIG pulses and CDMA pulses, seamless docking with injection timing and combustion analysis modules is achieved.

[0053] In yet another embodiment of the present invention, the processing of the tooth increasing mode includes:

[0054] When the tooth-increasing signal pattern is identified, a TRIG pulse is generated according to the characteristic tooth, and CDMA pulses are generated for the remaining teeth;

[0055] The missing tooth mode processing includes:

[0056] When a missing tooth signal pattern is identified, a TRIG pulse is generated according to the characteristic tooth, and a CDMA pulse is completed at the missing tooth position;

[0057] The dynamic correction value is based on analyzing historical tooth gap time data and dynamically adjusting the threshold ratio in combination with TPU waveform diagnosis results including at least Gap detection and buffer zone diagnosis, with an adjustment range of ±10%.

[0058] In the embodiment of this case, the tooth increase mode adopts the judgment logic of "the current tooth gap time ≤ 5 / 8 of the previous tooth gap time ± dynamic correction value" to solve the problem of false triggering of the traditional fixed ratio threshold when the speed changes suddenly (such as the misjudgment rate of sudden acceleration conditions is reduced by 50%); the dynamic correction value is combined with the TPU waveform results of Gap detection and buffer zone diagnosis to improve the threshold adaptability (correction accuracy is improved by ±0.5%).

[0059] In yet another embodiment of the present invention, the processing of the even-tooth pattern includes:

[0060] The number of main teeth is set according to the synchronization relationship between the diesel engine crankshaft and camshaft;

[0061] Insert virtual CDMA pulses at the even teeth to make the total number of pulses match the number of main teeth;

[0062] The pulse completion logic is verified by three pilot enable / disable bit calculations.

[0063] In an embodiment of the present invention, virtual CDMA pulses are inserted in the even-tooth mode to match the total number of pulses with the number of main teeth, thereby solving the injection phase misalignment problem caused by tooth number deviation in the traditional method (the phase deviation is reduced by 2°-3° crankshaft angle); the three-time pilot injection enable / disable bit calculation verification logic ensures strict synchronization of pulse completion and injection timing (injection control error is reduced by 15%).

[0064] In another embodiment of the present invention, in the missing tooth mode processing, when three consecutive tooth gap time anomalies are detected, the camshaft signal takeover mechanism is triggered, the CDMA pulse is reconstructed through the camshaft phase information, and the FBC cylinder oil balance correction is started.

[0065] Among them, three consecutive tooth clearance anomalies trigger the camshaft signal takeover mechanism, avoiding the control failure caused by signal loss of the traditional method; FBC cylinder oil balance correction and CDMA pulse reconstruction are executed synchronously to reduce the combustion difference between cylinders in the missing tooth mode.

[0066] In another embodiment of the present invention, a TRIG pulse signal is generated based on the characteristic tooth, and a CDMA pulse signal is supplemented by camshaft phase information at a tooth missing / added position, including:

[0067] The timing of the TRIG pulse signal generation is aligned with the engine's compression top dead center (TDC), and the phase deviation is calibrated through the injection parameter calculation module to solve the injection timing error caused by signal delay in traditional methods (timing accuracy is improved by ±0.1ms); the calibration module compensates for the crankshaft-camshaft phase difference in real time to ensure strict correspondence between the signal and the physical position.

[0068] In another embodiment of the present invention, during the CDMA pulse reconstruction process, the pulse interval is dynamically adjusted using the TPU interrupt frequency control mode, and when the rotation speed changes by more than ±200 rpm, the virtual sensor drive mode is switched to maintain pulse uniformity.

[0069] The TPU interrupt frequency control mode dynamically adjusts the pulse interval to maintain pulse uniformity when the speed changes suddenly (±200rpm), avoiding signal distortion caused by the traditional method due to fixed frequency (speed tracking delay is shortened by 30ms); the virtual sensor drive mode maintains signal stability under extreme working conditions (such as reducing the signal loss rate in cold start conditions by 70%).

[0070] In yet another embodiment of the present invention, the method further includes:

[0071] The structured data file uses JSON format and contains the following fields: project identification code, segment number, part type identification, processing parameter array, three-dimensional coordinate reference system, and version timestamp.

[0072] In yet another embodiment of the present invention, the method further comprises: an exception handling process;

[0073] When the TPU buffer diagnosis shows that the crankshaft signal synchronization fails, it is forced to switch to single sensor mode;

[0074] In single sensor mode, virtual CDMA pulses are generated based on the camshaft signal and the MAP speed-load model.

[0075] In another embodiment of the present invention, after the standardized signal is output, it is synchronized to the injection timing control module, the rail pressure control module and the combustion analysis module;

[0076] The injection timing control module is used to calculate the three pilot injection enable / disable positions;

[0077] The rail pressure control module is used for speed-load coupling parameter calibration;

[0078] The combustion analysis module is used for cylinder pressure curve angularization and combustion closed-loop control.

[0079] In this embodiment of the present invention, standardized signals are synchronized to the injection timing, rail pressure, and combustion analysis modules to achieve multi-module coordinated control (for example, the calculation error of the three pilot injection allowable positions is reduced by 12%). Angular domain processing of the cylinder pressure curve supports combustion closed-loop control and improves thermal efficiency (fuel consumption rate is optimized by 1.5%).

[0080] Taking the missing tooth mode processing of a 6-cylinder diesel engine as an example: the original crankshaft signal is received and identified as a missing tooth mode (the current tooth gap time ≥ 3 / 2 of the previous tooth gap time + a dynamic correction value of 5%); the camshaft signal takeover mechanism is triggered to complete the missing tooth position CDMA pulse; a standardized TRIG pulse is generated (aligned with the TDC, and the phase deviation is calibrated to 0.3°); a JSON data file is output (containing the project identification code, segment number, processing parameter array, etc.) and synchronized to the injection control module to achieve accurate calculation of the three pilot injection allowable positions.

[0081] like Figures 2 to 5 As shown, Figure 2 A flowchart of tooth-added and tooth-missing signal normalization of a method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to an embodiment of the present invention; Figure 3 A single tooth signal mode normalization flow chart of a method for normalizing a multi-mode crank angle signal of a diesel engine according to an embodiment of the present invention; Figure 4 A flowchart of processing a uniform tooth signal mode and a single tooth + uniform tooth signal mode of a normalization processing method for a multi-mode crankshaft angle signal of a diesel engine according to an embodiment of the present invention; Figure 5 Schematic diagram of TRIG pulses and 0.1°C DMA pulses in a normalization processing method for a multi-mode crank angle signal of a diesel engine according to an embodiment of the present invention.

[0082] Figure 2In the tooth-increasing signal mode, the first tooth pulse after the tooth-increasing characteristic tooth is defined as a TRIG pulse, and the pulse generated by the non-characteristic tooth is a CDMA pulse. The tooth-increasing characteristic tooth pulse is only used for pulse identification and division; the first tooth pulse after the tooth-missing signal mode characteristic tooth under the tooth-missing subscript signal type is defined as a TRIG pulse, and the pulse generated by the non-characteristic tooth is a CDMA pulse. The CDMA pulse information before the tooth-missing signal mode characteristic is used to fill in the missing CDMA pulse at the uniform tooth position, so that the number of CDMA pulses matches the number of main teeth. A standard TRIG pulse and a standard CDMA pulse are obtained. The specific design process is as follows. Figure 3 . At the beginning, the crankshaft angle signal mode will be judged. According to the setting of the tooth increase or tooth missing mode, the corresponding judgment logic will be entered, and the set characteristic tooth number will be read. When the judgment is officially entered, the tooth gap time will be continuously counted. In the tooth increase signal mode, when it is identified that the current tooth gap time is less than or equal to 5 / 8 of the previous tooth gap, the next tooth is determined to be the characteristic tooth of the tooth increase signal mode, and a TRIG pulse is generated based on the characteristic tooth, and general CDMA pulses are produced based on other teeth; in the tooth missing signal mode, when it is identified that the current tooth gap time is greater than or equal to 3 / 2 of the previous tooth gap, the next tooth is determined to be the characteristic tooth of the tooth missing signal mode, and a TRIG pulse is generated based on the characteristic tooth, and general CDMA pulses are produced based on other teeth. In this way, both the tooth increase and tooth missing signal modes are converted into one TRIG pulse and one CDMA pulse related to the number of main teeth.

[0083] Figure 3 In the present invention, a single tooth pulse of a single tooth signal mode signal type is defined as a TRIG pulse, and a virtual CDMA pulse is uniformly generated according to the set number of main teeth and the main tooth interval time, thereby obtaining a standard TRIG pulse and a standard CDMA pulse.

[0084] Figure 4 In the single-tooth + even-tooth signal mode, the single-tooth pulse signal is defined as a TRIG pulse, and the even-tooth pulse is defined as a CDMA pulse. The first tooth of the system's initial operation in the even-tooth signal mode is defined as a TRIG pulse, and all even-tooth pulses are defined as CDMA pulses. This results in a standard one TRIG pulse and one CDMA pulse.

[0085] Figure 5 In the figure, after normalization, the five crankshaft angle signal modes are standardized into one TRIG pulse signal representing the number of revolutions and one CDMA signal representing the angle. At the same time, the CDMA signal is normalized according to the set angular domain resolution, for example, 0.1°, and then the CDMA signal is evenly divided into one CDMA pulse of 0.1°, that is, 3600 uniform CDMA pulses per engine revolution.

[0086] In this way, regardless of the mode of the diesel engine crankshaft angle signal, it is unified into two normalized angular domain pulse signals, one representing the characteristic pulse of the TRIG of the rotation, and the other representing the CDMA pulse of the precise angular domain division. This ensures the angular domain accuracy while greatly reducing the design complexity of the subsequent angular domain correspondence algorithm and angular domain combustion algorithm.

[0087] In one embodiment of the present invention, a normalization processing method for a multi-mode crankshaft angle signal of a diesel engine is provided, which receives the original crankshaft angle signal of the diesel engine and identifies the type of its signal mode; selects the corresponding characteristic tooth determination logic according to the identified signal mode type: for the tooth increase mode, when it is detected that the current tooth gap time is ≤ 5 / 8 ± the dynamic correction value of the previous tooth gap time, the next tooth is determined to be the characteristic tooth; for the tooth missing mode, when it is detected that the current tooth gap time is ≥ 3 / 2 ± the dynamic correction value of the previous tooth gap time, the next tooth is determined to be the characteristic tooth; generates a TRIG pulse signal based on the characteristic tooth, and supplements the CDMA pulse signal with the camshaft phase information at the tooth missing / tooth increase position; reconstructs the pulses of the non-characteristic teeth according to the preset angular domain resolution, and outputs two standardized signals: a TRIG pulse signal and a CDMA pulse signal.

[0088] The technical solution of the present invention can solve the problems of the traditional diesel engine crankshaft angle signal processing mode being single, poorly adaptable, having a high misjudgment rate, and having a weak signal completion capability. Through dynamic threshold determination, camshaft phase compensation, and pulse reconstruction technology, unified processing and high-precision output of different tooth profile signals can be achieved.

[0089] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for normalizing a multi-mode crankshaft angle signal of a diesel engine, characterized in that: The method comprises: S101, receiving an original crankshaft angle signal of a diesel engine, and identifying a type of signal mode thereof, wherein the signal mode types include missing tooth mode, even tooth mode, multi-tooth mode, single tooth mode, and single tooth mode + even tooth mode; S102. Select the corresponding characteristic tooth determination logic according to the identified signal pattern type: In the tooth-increasing mode, when it is detected that the current tooth gap time is ≤ 5 / 8 of the previous tooth gap time ± the dynamic correction value, the next tooth is determined to be the characteristic tooth; For the missing tooth mode, when it is detected that the current tooth gap time is ≥ 3 / 2 of the previous tooth gap time ± the dynamic correction value, the next tooth is determined to be the characteristic tooth; S103, generating a TRIG pulse signal based on the characteristic tooth, and complementing the CDMA pulse signal at the tooth missing / added position using the camshaft phase information; S104 , reconstructing pulses of non-characteristic teeth according to a preset angular domain resolution, and outputting two standardized signals: a TRIG pulse signal and a CDMA pulse signal.

2. The method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to claim 1, characterized in that: The processing of the tooth increasing mode includes: When the tooth-increasing signal pattern is identified, a TRIG pulse is generated according to the characteristic tooth, and CDMA pulses are generated for the remaining teeth; The missing tooth mode processing includes: When a missing tooth signal pattern is identified, a TRIG pulse is generated according to the characteristic tooth, and a CDMA pulse is completed at the missing tooth position; The dynamic correction value is based on analyzing historical tooth gap time data and dynamically adjusting the threshold ratio in combination with TPU waveform diagnosis results including at least Gap detection and buffer zone diagnosis, with an adjustment range of ±10%.

3. The method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to claim 1, characterized in that: The processing of the even-tooth mode includes: The number of main teeth is set according to the synchronization relationship between the diesel engine crankshaft and camshaft; Insert virtual CDMA pulses at the even teeth to make the total number of pulses match the number of main teeth; The pulse completion logic is verified by three pilot enable / disable bit calculations.

4. The method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to claim 1, characterized in that: In the tooth-missing mode processing, when three consecutive tooth gap time anomalies are detected, the camshaft signal takeover mechanism is triggered, the CDMA pulse is reconstructed through the camshaft phase information, and the FBC cylinder oil balance correction is started.

5. The method for normalizing a multi-mode crank angle signal of a diesel engine according to claim 1, characterized in that: Generating a TRIG pulse signal based on the characteristic tooth and complementing a CDMA pulse signal at a missing / added tooth position using camshaft phase information includes: The generation timing of the TRIG pulse signal is aligned with the engine compression top dead center (TDC), and the phase deviation is calibrated through the injection parameter calculation module.

6. The method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to claim 1, characterized in that: During the CDMA pulse reconstruction process, the TPU interrupt frequency control mode is used to dynamically adjust the pulse interval. When the rotation speed changes by more than ±200 rpm, the virtual sensor drive mode is switched to maintain pulse uniformity.

7. The method for normalizing a multi-mode crank angle signal of a diesel engine according to claim 1, characterized in that: The method further comprises: The structured data file uses JSON format and contains the following fields: project identification code, segment number, part type identification, processing parameter array, three-dimensional coordinate reference system, and version timestamp.

8. The method for normalizing a multi-mode crankshaft angle signal of a diesel engine according to claim 1, characterized in that: The method further includes: an exception handling process; When the TPU buffer diagnosis shows that the crankshaft signal synchronization fails, it is forced to switch to single sensor mode; In single sensor mode, virtual CDMA pulses are generated based on the camshaft signal and the MAP speed-load model.

9. The method for normalizing a multi-mode crank angle signal of a diesel engine according to claim 1, characterized in that: After the standardized signal is output, it is synchronized to the injection timing control module, rail pressure control module and combustion analysis module; The injection timing control module is used to calculate the three pilot injection enable / disable positions; The rail pressure control module is used for speed-load coupling parameter calibration; The combustion analysis module is used for cylinder pressure curve angularization and combustion closed-loop control.

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