CN106499532B - Quick starting method of engine - Google Patents
Quick starting method of engine Download PDFInfo
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- CN106499532B CN106499532B CN201610906072.1A CN201610906072A CN106499532B CN 106499532 B CN106499532 B CN 106499532B CN 201610906072 A CN201610906072 A CN 201610906072A CN 106499532 B CN106499532 B CN 106499532B
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- engine
- signal
- crankshaft
- reverse rotation
- phase
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
- F02D2041/0092—Synchronisation of the cylinders at engine start
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention relates to a quick starting method of an engine, and a device for realizing the method comprises an engine control unit, a crankshaft code disc, a crankshaft sensor, a cam code disc and a camshaft sensor, wherein the crankshaft and camshaft sensor are Hall sensors; the method is characterized in that: the method is based on a Hall sensor and is used for quickly starting an engine, and compared with a magnetoelectric sensor, the Hall sensor has the advantages of high response frequency and strong anti-interference capability, and the lowest identification rotating speed can reach 0 rpm; the engine can quickly identify and synchronize within 360 degrees of the crankshaft, and the fuel injection pilot injection is controlled to enable fuel to enter the cylinder at the first time, so that the starting performance of the engine can be improved, and the service lives of a starter and a storage battery are prolonged.
Description
Technical Field
The invention relates to a quick starting method of an engine, and belongs to the field of engine control.
Background
The synchronous identification of the crankshaft and camshaft signals of an engine is a core function of engine control software, and is a key factor for determining the starting performance of the engine. Synchronous identification, that is, an electronic control system determines the phase of an engine according to a crankshaft signal and a cam signal, and timing control such as oil injection, ignition and the like can be sequentially performed according to a defined cylinder sequence after synchronization. The timing of synchronous identification is determined by the form of the crankshaft signal and the camshaft signal and the quality of the algorithm, and most of the prior art determine the phase of the engine and need to rotate the crankshaft for two circles, namely 720 degrees.
In the conventional control, fuel is firstly injected into an air passage of an engine system in an air passage injection mode, and then the fuel and air form a mixture and then enter a cylinder together. Because of the delay in fuel entering the cylinders from the air passage, when the electronic control system controls the ignition of the first cylinder, no fuel is in the cylinder, and the starting time of the engine is not ideal. In particular, the rotation speed of the starter is lower in cold region conditions, and the starting time is relatively longer.
In summary, the engine starting performance can be improved only by rapidly identifying the engine phase and controlling the timing of injection or the like as early as possible.
The fast synchronization scheme in the existing patent introduces a shutdown phase detection scheme: the method for performing phase detection during shutdown by using a magnetoelectric signal is available, but the magnetoelectric sensor has low response speed, and the lowest rotation speed is recognized in dozens of revolutions, so that the real conditions of a crankshaft signal and a cam signal during shutdown are difficult to reflect; there are also patents that call for controlling injection during shutdown to stop the engine at a certain cylinder position, but this method is difficult to achieve and hardly effective.
Disclosure of Invention
In view of the above circumstances, the present invention aims to provide a method for quickly starting an engine, which is based on a hall sensor, wherein the hall sensor has the advantages of high response frequency, strong anti-interference capability, and lowest identification rotation speed of 0 rpm, compared with a magnetoelectric sensor; the engine can quickly identify and synchronize within 360 degrees of the crankshaft, and the fuel injection pilot injection is controlled to enable fuel to enter the cylinder at the first time, so that the starting performance of the engine can be improved, and the service lives of a starter and a storage battery are prolonged.
The technical scheme of the invention is realized as follows: a quick starting method of an engine comprises an engine control unit, a crankshaft code disc, a crankshaft sensor, a cam code disc and a cam shaft sensor, wherein the crankshaft and cam shaft sensor is a Hall sensor; the method is characterized in that: the method comprises the following steps of performing quick synchronous identification according to a shutdown phase, a crankshaft signal and a cam signal, and controlling oil injection pre-injection after quick synchronization, wherein the method comprises the following specific steps:
1. the detection scheme of the engine stop position specifically comprises the following steps:
1) the function of engine stop position detection is activated. When the engine is in a synchronous state, a stop instruction is detected, and the rotating speed is lower than a set value, the stop detection function is enabled.
2) The detection of the reverse rotation position before the shutdown comprises the following specific detection processes:
a) predicting crankshaft signal reversal before shutdown;
b) detecting a reverse rotation position according to the crankshaft signal, and recording phase information during reverse rotation;
c) the reversal detection is verified based on the crankshaft signal and the cam signal.
3) And (6) stopping detecting. And when the crankshaft signal is detected to be overtime after the reverse rotation is detected, the engine is confirmed to be stopped.
4) The detected shutdown phase state is saved upon power down.
2. According to the quick synchronous identification of the stop phase, the crankshaft signal and the cam signal, the pre-injection control of oil injection is carried out, and the specific implementation steps are as follows:
1) the last engine shutdown phase is read.
2) And detecting a crankshaft signal and a cam signal, and entering a quick identification strategy according to the state conditions of the crankshaft signal and the cam signal.
3) A fast synchronization strategy. And quickly identifying the synchronization of the engine according to the stop phase state, the crankshaft signal state and the cam signal state. If the quick identification is successful, triggering quick synchronous interruption; otherwise, waiting for the normal synchronization strategy. In the rapid synchronous interruption, the cylinder of the intake stroke is subjected to the fuel injection pilot injection control according to the current engine phase.
4) A normal synchronization policy. Synchronization is identified based on the determination of both the crankshaft signal phase and the cam signal phase. After the synchronization is confirmed, checking the phase of the rapid synchronization, and continuing working according to the current phase if the check is consistent; otherwise, the phase of the engine is corrected, the data of the triggered fuel injection pilot injection is forbidden, and the relevant control of the timing is continued according to the corrected phase.
The invention has the advantages that the engine can quickly identify and synchronize within the range of 360 degrees of the crankshaft, and the fuel injection and the pilot injection are controlled to ensure that the fuel enters the cylinder at the first time, so that the starting performance of the engine can be improved, and the service lives of the starter and the storage battery are prolonged.
Drawings
FIG. 1 is a diagram of an apparatus for carrying out the method of the present invention.
FIG. 2 is an exemplary graph of crankshaft signal variation during shutdown.
Fig. 3 is a flowchart of the engine stop position detection of the present invention.
FIG. 4 is a state diagram of the engine rapid start scenario of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples: as shown in fig. 1, a method for quickly starting an engine, characterized by:
1) performing rapid synchronous identification according to information such as a stop position, a crankshaft signal, a cam signal and the like;
2) and performing oil injection pilot injection control according to the quick synchronous phase.
3) The phase of the fast synchronization is checked in the normal synchronization strategy.
The detection of the stop position uses the existing Hall sensor to detect the following process:
1) predicting whether the engine will reverse at the TDC position according to a period of the crankshaft signal;
2) activating a reverse rotation detection program after reverse rotation is predicted according to the crankshaft signal;
3) and after the reverse rotation is detected, detecting a crankshaft signal and a cam signal and verifying the reverse rotation condition.
The method for fast synchronous identification comprises the following steps:
1) the stop phase is available, and the information of the crankshaft signal and the cam signal is used for quickly judging the phase.
2) If the stop phase is not available, the synchronization is quickly judged by using the characteristic information of the crankshaft signal and the cam signal.
The fuel injection pilot injection control is to control the fuel injection timing of the intake cylinder.
The normal synchronization strategy is the judgment of the engine phase on the basis of the determination of both the crankshaft signal phase and the cam signal phase.
The reverse rotation prediction is that the prediction range of the crankshaft signal is between two TDC and is set according to the actual engine.
The reverse rotation detection program sets a crankshaft signal threshold for reverse rotation detection, which is set based on the rate of change of the signal during actual engine stop reverse rotation.
The reverse rotation verification is to verify the reverse rotation condition according to the theoretical positions of the crankshaft and the cam.
As shown in fig. 2, the actual measured change of the signal during the engine stop process is analyzed. The sensor type is Hall sensor, the crankshaft code disc is 60-2, the cam code disc is 6+1 type: the normal tooth spacing is 120 °, i.e. 20 crankshaft teeth. According to the variation characteristic of the engine speed, the engine speed at the TDC is relatively low under the normal condition, the crankshaft signal is changed from narrow-wide-narrow near the TDC, and the variation condition of the crankshaft signal at the TDC position is obtained after the third rising edge of the cam signal as shown in the figure.
When the engine is started, the change of the crank signal from narrow-wide-narrow appears outside the TDC range, and the engine is preliminarily confirmed to rotate reversely if the crank period changes from narrow-wide-narrow after 15 teeth after TDC. And the position of the engine relative to the crankshaft is deviated by the judgment of the fourth cam signal, and the reverse rotation of the engine is further confirmed. Due to the inertia of the engine, the engine will then repeat several reversals within a certain angular range before the top dead center of a cylinder, eventually stopping at a position between the two top dead centers.
Because the rotational inertia and the frictional resistance of various engines are different, the reverse rotation at the stop time is different: some engines rotate reversely for multiple times when stopped, and some rotate reversely for one time. But it was concluded through experimental studies on various engines: the engine stops and begins to reverse before the compression stroke of a cylinder reaches TDC and eventually between TDC for that cylinder and TDC for the previous cylinder.
Fig. 3 shows, according to the above conclusions, the specific flow of the engine stop phase detection in the method of the present invention is as follows:
1) and when the engine runs synchronously, enabling the stop detection function according to the working condition of the running of the engine.
2) A stall reversal prediction window is triggered. The prediction window is within a certain range before the crankshaft signal TDC and the range is calibrated according to different engine types.
3) The period of the continuous crankshaft signal is recorded within the prediction window.
4) Reverse rotation is predicted to occur based on the period of the recorded crankshaft, and reverse rotation detection is triggered if reverse rotation is predicted to occur.
5) The engine reverse rotation is detected. When the periodic change rate of the crankshaft is detected to be larger than a set threshold value, reverse rotation is detected, and information such as the current engine speed, the cylinder number and the like is recorded; otherwise repeat the process 2.
6) And checking the reverse rotation of the engine. And after the reverse rotation is detected, continuously detecting the crankshaft signal and the cam signal and carrying out reverse rotation verification. When the position of the cam signal relative to the crankshaft signal is detected to be inconsistent with the system configuration information, confirming a reverse rotation state; otherwise, the detected shutdown phase is invalid and the process 2 is repeated.
7) When the system is powered down, the detected stop phase information is written into the EEPROM for quick synchronous identification of the next starting of the engine.
FIG. 4 shows a specific process of engine fast synchronization recognition and pre-injection as follows:
1) the electric control system is electrified and enters an initialization processing program: configuration information of a crankshaft signal and a cam signal is read, stop phase information is read from an EEPROM, and then a stop state is entered.
2) In the stop state, a wait synchronization state is entered according to the crank signal and the cam signal, as shown in condition 1.
3) Under the condition of waiting for synchronization, entering a rapid synchronization strategy according to the signal state conditions of the crankshaft and the camshaft, as shown in a condition 3 in the figure; otherwise, the normal synchronization strategy is entered, as shown in fig. condition 4.
4) In the state of the rapid synchronization strategy, if the shutdown phase is effective, synchronization is rapidly identified according to the state of a crankshaft signal on the basis, otherwise, rapid synchronization identification is carried out according to the crankshaft signal and a cam signal, and if the synchronization identification is successful, corresponding timing control such as oil injection pre-injection is triggered, and a normal synchronization strategy is entered, as shown in a condition 5.
5) In the normal synchronization strategy, the self-synchronization of the crankshaft signal and the self-synchronization of the cam signal are firstly confirmed, and then the synchronization is confirmed according to the phase relation of the crankshaft and the cam signal. If the normal synchronization is successfully judged, checking whether the fast synchronization phase is correct, and if the fast synchronization phase is correct, maintaining the current phase and continuing to perform oil injection and other controls; otherwise, the phase is corrected, the triggered oil injection pre-injection data is forbidden, and oil injection is controlled again according to the corrected phase. Then enter the synchronization control state, as shown in fig. condition 6.
6) In the synchronous state, enabling angle management triggers angle interrupt control, calculation of engine phase, cylinder number, etc., and exits synchronization when a crank signal fault is detected, as shown in fig. condition 7.
Claims (4)
1. A method of quickly starting an engine, characterized by:
1) carrying out rapid synchronous identification according to the stop position, the crankshaft signal and the cam signal information;
2) performing oil injection pre-injection control according to the rapid synchronous phase;
3) checking the phase of the fast synchronization in a normal synchronization strategy;
the process in which the detection of the stop position is detected using the existing hall sensor is as follows:
1) predicting whether the engine will reverse at the TDC position according to a period of the crankshaft signal;
2) activating a reverse rotation detection program after reverse rotation is predicted according to the crankshaft signal;
3) after the reverse rotation is detected, detecting a crankshaft signal and a cam signal and verifying the reverse rotation condition;
the method for fast synchronous identification comprises the following steps:
1) if the shutdown phase is available, quickly judging the phase by using the information of the crankshaft signal and the cam signal;
2) if the shutdown phase is not available, quickly judging synchronization by using the characteristic information of the crankshaft signal and the cam signal;
the oil injection pre-injection control is to perform oil injection timing control on an air inlet cylinder;
the normal synchronization strategy is an engine phase determination based on both the crankshaft signal phase and the cam signal phase determination.
2. A method for quickly starting an engine according to claim 1, wherein the reverse rotation prediction is that the predicted range of the crank signal is between two TDC, and is set according to the actual engine.
3. A method for quickly starting an engine according to claim 1, wherein said reverse rotation detection routine sets a threshold value of the crank signal for reverse rotation detection, the threshold value being set in accordance with a rate of change of the signal at the time of reverse rotation at an actual engine stop.
4. A method for starting an engine as defined in claim 1, wherein said reverse rotation verification verifies reverse rotation based on theoretical positions of the crankshaft and the cam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610906072.1A CN106499532B (en) | 2016-10-19 | 2016-10-19 | Quick starting method of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610906072.1A CN106499532B (en) | 2016-10-19 | 2016-10-19 | Quick starting method of engine |
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| Publication Number | Publication Date |
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| CN106499532A CN106499532A (en) | 2017-03-15 |
| CN106499532B true CN106499532B (en) | 2019-12-31 |
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| CN201610906072.1A Active CN106499532B (en) | 2016-10-19 | 2016-10-19 | Quick starting method of engine |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561235B (en) * | 2018-04-04 | 2019-04-02 | 清华大学 | Engine progress control method and device |
| CN110243608B (en) * | 2019-06-30 | 2021-10-29 | 潍柴动力股份有限公司 | Method for detecting misassembly of camshaft and electric control diesel engine |
| CN112983666B (en) * | 2021-03-26 | 2022-09-13 | 中国第一汽车股份有限公司 | Automobile quick starting method, device, equipment and storage medium |
| CN114320621B (en) * | 2021-12-21 | 2023-03-03 | 联合汽车电子有限公司 | Engine control method, engine control device, storage medium and equipment |
| CN115450773B (en) * | 2022-09-30 | 2024-06-14 | 中国第一汽车股份有限公司 | Vehicle and phase synchronization method and device of engine of vehicle |
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| GB2369160A (en) * | 2000-10-11 | 2002-05-22 | Daimler Chrysler Ag | Improving the re-starting of an i.c. engine having a starter/generator |
| EP2143920A2 (en) * | 2008-07-07 | 2010-01-13 | Toyota Jidosha Kabusiki Kaisha | Control apparatus for internal combustion engine |
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| JP2016033366A (en) * | 2014-07-31 | 2016-03-10 | 株式会社デンソー | Engine rotational behavior prediction apparatus and engine starter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10228147B3 (en) * | 2002-06-24 | 2004-01-22 | Siemens Ag | Method for determining the starting angular position of an internal combustion engine |
| US7142973B2 (en) * | 2004-06-11 | 2006-11-28 | Denso Corporation | Engine control apparatus designed to ensure accuracy in determining engine position |
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2016
- 2016-10-19 CN CN201610906072.1A patent/CN106499532B/en active Active
Patent Citations (4)
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| GB2369160A (en) * | 2000-10-11 | 2002-05-22 | Daimler Chrysler Ag | Improving the re-starting of an i.c. engine having a starter/generator |
| EP2143920A2 (en) * | 2008-07-07 | 2010-01-13 | Toyota Jidosha Kabusiki Kaisha | Control apparatus for internal combustion engine |
| CN102767432A (en) * | 2012-07-31 | 2012-11-07 | 长城汽车股份有限公司 | Starting and stopping control method for direct-injection engine inside cylinder |
| JP2016033366A (en) * | 2014-07-31 | 2016-03-10 | 株式会社デンソー | Engine rotational behavior prediction apparatus and engine starter |
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