CN112177782B - Super-knocking abnormal combustion processing control method for supercharged gasoline engine - Google Patents
Super-knocking abnormal combustion processing control method for supercharged gasoline engine Download PDFInfo
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
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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
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0261—Controlling the valve overlap
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02D41/30—Controlling fuel injection
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides a control processing method for super knocking abnormal combustion of a supercharged gasoline engine, which relates to the technical field of supercharged gasoline engines and comprises the steps of firstly collecting a knocking signal through a knocking sensor and processing the knocking signal through a sensor signal processing module; and then, an engine controller ECU (electronic control Unit) detects the processed knock signal in real time on line, analyzes and judges the continuous occurrence frequency of super knock abnormal combustion and the cylinder, and effectively controls the frequent occurrence phenomenon of super knock abnormal combustion of the supercharged gasoline engine by adopting a processing method of sequentially and gradually enriching mixed gas, reducing a valve overlap angle, reducing the engine load and finally cutting off oil according to the continuous occurrence frequency of super knock abnormal combustion, and simultaneously considers the smoothness of the whole vehicle driving, thereby effectively protecting the engine from being damaged and simultaneously improving the driving experience of a whole vehicle user.
Description
Technical Field
The invention relates to the technical field of supercharged gasoline engines, in particular to a control processing method for super-knocking abnormal combustion of a supercharged gasoline engine.
Background
The gasoline engine supercharging technology is one of the advanced gasoline engine technologies widely applied in the automobile industry at home and abroad, and is the mainstream technology for realizing the miniaturization and low speed of the gasoline engine, greatly improving the power performance of the gasoline engine and reducing the oil consumption. However, after the technology is applied, while the gasoline engine can output higher torque and power, the peak value of the explosion pressure and the peak value of the combustion temperature in the cylinder are also obviously increased, and the self-ignition of the fuel/air mixture, namely the pre-ignition (also called super detonation in the industry) is very easy to occur before the ignition of the spark plug.
Super detonation combustion of a supercharged gasoline engine is an abnormal combustion phenomenon, has strong randomness, is mostly generated under the working conditions of low speed and high load of the gasoline engine, and is accompanied by the peak pressure in a cylinder exceeding 20MPa and extremely high pressure oscillation frequency, so that serious mechanical faults of the gasoline engine such as piston collapse are easily caused, and the work of the gasoline engine is disabled. The reason is that the occurrence of super detonation abnormal combustion has strong randomness, and the initiation reason is mainly the thermal environment in the cylinder (the specific factors are not finally fixed in academic circles at present), so that the complete elimination of super detonation abnormal combustion of the supercharged gasoline engine becomes an industry-recognized technical problem, and the occurrence frequency of the super detonation abnormal combustion can only be controlled so as to avoid the damage of the engine under the overhigh super detonation combustion frequency.
For example, CN201510041093.7 discloses a method for controlling super knocking of a direct injection supercharged gasoline engine, which suppresses super knocking by delaying the last oil injection to the compression stroke, and the method is simple and rough, and may have a problem that the super knocking cannot be effectively controlled to continuously occur; as another example, patent application No. CN201610105389.5 discloses a super knock control system and method for a supercharged direct injection engine, which is to adopt three steps of changing the mixture concentration, reducing the torque and cutting off the fuel oil to suppress the occurrence of the super knock after detecting the super knock of the engine, but does not give a threshold value (the number of super knocks) suggestion for taking control measures and the time for implementing each step.
The engine oil-cut method is mainly used for controlling the generation frequency of super knocking, namely in the running process of the whole vehicle, when an engine electric control system detects the super knocking, oil supply is stopped for a cylinder generating the super knocking, and the oil supply is resumed after the engine electric control system continues for a certain time. The engine fuel cut-off method can effectively prevent the engine from continuously generating fuel again after the super detonation occurs, but after a certain cylinder of the engine cuts off fuel and stops working, the running rotating speed and the output torque of the engine are greatly fluctuated, the whole vehicle runs unsmoothly, the driving performance is seriously influenced, and the engine needs to be optimized and perfected.
Therefore, it is necessary to develop a method for controlling super-knock abnormal combustion of a supercharged gasoline engine.
Disclosure of Invention
In view of the above, the present invention provides a control processing method for super knocking abnormal combustion of a supercharged gasoline engine, which effectively controls the frequent occurrence of super knocking abnormal combustion of the supercharged gasoline engine by means of progressive enrichment, reduction of valve overlap angle, reduction of engine load and final fuel cut-off, and can also improve the smoothness of the entire vehicle driving.
The invention provides a control processing method for super knocking abnormal combustion of a supercharged gasoline engine, which comprises the following steps:
step 1, collecting a knock signal through a knock sensor, and processing the knock signal by a sensor signal processing module;
step 2, analyzing and judging the continuous occurrence frequency of super-knock abnormal combustion and the cylinder by the engine controller ECU through real-time online detection of the processed knock signal;
step 3, if the super-knock abnormal combustion is not detected, the engine controller ECU operates according to the original working condition and parameter setting, and if the super-knock abnormal combustion frequency in the cylinder is detected to be a first preset frequency, the step 4 is entered;
step 4, implementing a mixed gas enrichment control measure, namely increasing the oil injection quantity of an oil injector by increasing the oil injection time of the oil injector by an engine controller ECU, enriching the mixed gas of the next working cycle in the cylinder on the premise of keeping the air inflow unchanged so as to reduce the temperature in the cylinder, keeping the temperature for a period of time, and continuously detecting the occurrence condition of super-knock abnormal combustion and the weighted acceleration of the whole vehicle in the duration time of the enriched mixed gas;
step 5, in the duration of the enriched mixed gas, if the super detonation abnormal combustion is detected not to continue to occur in the preset time or the weighted acceleration of the whole vehicle exceeds a threshold value, the engine controller ECU controls the fuel injection quantity of the fuel injector to recover the fuel supply quantity value before the super detonation abnormal combustion and interrupts the measure of the enriched mixed gas,
if the number of times of continuously generating super knocking is detected to be the second preset number of times within the preset time and the weighted acceleration of the whole vehicle is within the threshold value range within the duration time of the enriched mixed gas, entering step 6;
step 6, controlling a variable valve timing mechanism by an engine controller ECU, reducing the valve phase overlap angle of an intake valve and an exhaust valve, keeping for a period of time to reduce the high-temperature residual waste gas amount in a cylinder, and continuously detecting the occurrence condition of super-knock abnormal combustion and the smoothness of the whole vehicle in the keeping time of adjusting the intake and exhaust VVT;
step 7, in the keeping time of adjusting the intake and exhaust VVT, if the super knock abnormal combustion is detected not to continue to occur in the preset time or the smoothness of the whole vehicle exceeds a threshold value, the engine controller ECU controls the fuel injection quantity and the valve overlap angle to recover to the values before the super knock abnormal combustion occurs, and quits the interruption of the mixed gas enrichment control measure and the valve overlap angle reduction control,
in the adjustment of the keeping time of the intake and exhaust VVT, if the times of continuously generating super-knock abnormal combustion are detected to be the third preset times in the preset time and the weighted acceleration of the whole vehicle is still in the threshold range, the step 8 is executed;
step 8, the engine controller ECU reduces the working load of the engine, the combustion temperature and pressure in the cylinder by means of retarding the ignition time of the spark plug, reducing the supercharging pressure of the supercharger and reducing the air inflow of the engine, keeps for a period of time, and continuously detects the abnormal combustion occurrence and normal smoothness of the super knock within the keeping time of reducing the working load;
step 9, in the holding time of reducing the working load, the engine controller ECU checks the abnormal combustion condition of the super detonation, and simultaneously checks the weighted acceleration of the whole vehicle, if the abnormal combustion of the super detonation is not continuously generated in the preset time or the weighted acceleration of the whole vehicle exceeds a threshold value, the engine controller ECU controls the fuel injection quantity, the valve overlap angle and the working load to be recovered to the values before the abnormal combustion of the super detonation, and the control of interrupting the enrichment of the mixed gas, reducing the valve overlap angle and reducing the working load is quitted,
and in the retention time of reducing the working load, if the number of times of continuously generating super-knock abnormal combustion is detected to be the fourth preset number of times in the preset time and the weighted acceleration of the whole vehicle is still in the threshold range, controlling the fuel injector to stop supplying fuel by the engine controller ECU, continuously detecting the super-knock abnormal combustion frequency by the engine controller ECU, recovering the fuel supply when confirming that no super-knock abnormal combustion exists or the weighted acceleration of the whole vehicle exceeds the threshold, and simultaneously recovering the fuel injection quantity, the valve overlap angle and the working load to the values before the super-knock abnormal combustion occurs.
Further, the first preset number is that the number of times of detecting the super-knock abnormal combustion in the cylinder is one, the second preset number is that the number of times of detecting the super-knock abnormal combustion in the cylinder is two, the third preset number is that the number of times of detecting the super-knock abnormal combustion in the cylinder is three, and the fourth preset number is that the number of times of detecting the super-knock abnormal combustion in the cylinder is four.
Further, the measure of performing the mixture enrichment control in step 4 is to enrich the original equivalent mixture 1ambda to 1.0 to 1ambda to 0.75, which is more beneficial to reducing the super-knock abnormal combustion tendency.
Further, according to an experimental optimization result, the workload in the step 8 is specifically reduced to 80% of the original workload.
Further, the threshold value is used for acquiring acceleration signals above a seat cushion, a seat backrest and a foot supporting surface through a whole vehicle acceleration sensor, calculating to obtain an effective value of the weighted acceleration of the whole vehicle, and judging the smoothness of the whole vehicle.
Further, when the weighted acceleration of the whole vehicle is less than 0.35m/s2The smoothness of the whole vehicle is in a satisfactory state;
when the weighted acceleration of the whole vehicle is at 0.35m/s2To 0.5m/s2Between ranges, the ride comfort of the entire vehicle is in a slightly uncomfortable, but acceptable, state;
when the weighted acceleration of the whole vehicle is at 0.5m/s2To 1m/s2In the range, the smoothness of the whole vehicle is in an uncomfortable state.
The invention brings the following beneficial effects:
according to the control processing method for super knocking abnormal combustion of the supercharged gasoline engine, the phenomenon that super knocking abnormal combustion of the supercharged gasoline engine frequently occurs is effectively controlled by adopting the processing methods of sequentially and gradually enriching mixed gas, reducing the valve overlap angle, reducing the engine load and finally cutting off oil, the smoothness of the whole vehicle driving is considered, the engine is effectively protected from being damaged, and the driving experience of a whole vehicle user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a control processing method for super-knock abnormal combustion of a supercharged gasoline engine provided by the invention.
Detailed Description
As shown in fig. 1, a control processing method for super knocking abnormal combustion of a supercharged gasoline engine is to protect the engine on the premise of simultaneously ensuring the working stability of the engine after the super knocking abnormal combustion of the supercharged gasoline engine occurs so as to avoid the unsmooth driving of the whole vehicle, and comprises the following specific steps:
step 1, firstly, a knock sensor collects a knock signal (collects a vibration signal), and a sensor signal processing module carries out integral processing on the knock signal.
And 2, analyzing and judging the continuous occurrence frequency of super-knock abnormal combustion and the position of the cylinder by the engine controller ECU through detecting the knock signal subjected to integral processing on line in real time.
And 3, if the super detonation abnormal combustion is not detected, the engine controller ECU operates according to the set working condition and parameter, and if the super detonation abnormal combustion is detected in a certain cylinder, the step 4 is carried out.
Step 4, implementing a measure of controlling enrichment of the mixed gas, which is generally the mixed gas enriched from the original equivalent mixed gas 1ambda to 1.0 to 1ambda to 0.75, and is more beneficial to reducing the tendency of super knock abnormal combustion. The specific operation means that the ECU of the engine controller increases the oil injection time of the oil injector to increase the oil injection quantity of the oil injector, enriches the fuel/air mixed gas of the next working cycle in the cylinder on the premise of keeping the air inflow unchanged to reduce the temperature in the cylinder, and keeps a period of time, wherein the period of time is optimized and set through tests according to the specific conditions of the engine and the whole vehicle, the duration time is generally set to be 5 seconds, the period of time can also be adjusted according to the optimization results of subsequent different experimental conditions, and meanwhile, the occurrence condition of the super-knock abnormal combustion and the weighted acceleration of the whole vehicle are continuously detected within 5 seconds of the duration time of the enriched mixed gas.
And 5, in the duration of the enriched mixed gas, if detecting that the super-detonation abnormal combustion does not continuously occur within the preset time or the weighted acceleration of the whole vehicle exceeds a threshold value, controlling the fuel injection quantity of the fuel injector to recover to the fuel supply quantity value before the super-detonation abnormal combustion by the engine controller ECU, and interrupting the measure of controlling the enrichment of the mixed gas, and in the duration of the enriched mixed gas, if detecting that the super-detonation abnormal combustion continuously occurs twice within the preset time and the weighted acceleration of the whole vehicle is within the range of the threshold value, entering the step 6.
It should be noted that the threshold value is obtained by acquiring acceleration signals above the seat cushion, the seat back and the foot supporting surface through the vehicle acceleration sensor, and calculating to obtain an effective value of the weighted acceleration of the whole vehicle, so as to judge the smoothness of the whole vehicle. As shown in Table 1, when the weighted acceleration of the whole vehicle is less than 0.35m/s2The smoothness of the whole vehicle is in a satisfactory state; when the weighted acceleration of the whole vehicle is at 0.35m/s2To 0.5m/s2Between ranges, the ride comfort of the entire vehicle is in a slightly uncomfortable, but acceptable, state; when the weighted acceleration of the whole vehicle is at 0.5m/s2To 1m/s2Between ranges, ride comfort of the entire vehicle is offComfortable state. The specific criteria are shown in the following table.
| Weighted acceleration a of whole vehiclev(m/s2) | Human body comfort level (subjective feeling) |
| ＜0.35 | Without discomfort |
| 0.35-0.5 | Slight discomfort, acceptance |
| 0.5-1 | Is relatively uncomfortable |
TABLE 1 evaluation Standard for comfort of the entire vehicle
Step 6, the engine controller ECU reduces the valve phase overlap angle of the intake and exhaust valves by controlling the variable valve timing mechanism (VVT) for a period of time to reduce the amount of high-temperature residual exhaust gas in the cylinder. The length of the holding time period of the intake and exhaust VVT is also set optimally by tests according to the specific conditions of the engine and the entire vehicle, and is generally set initially at 10 seconds (or adjusted according to the optimization results under different subsequent test conditions), and the occurrence of super-knock abnormal combustion and the weighted acceleration of the entire vehicle are continuously detected within 5 seconds of the preset time.
7, if the super-detonation abnormal combustion is not continuously generated within 5 seconds of the preset time, or the weighted acceleration value of the whole vehicle exceeds 0.5m/s2The ECU controls the fuel injection quantity and the valve overlap angle to recover to the values before the abnormal combustion of the super detonation occursAnd quitting the measures of interrupting the enrichment control of the mixed gas and the reduction control of the valve overlap angle, if three times of super detonation abnormal combustion are detected within 5 seconds of the preset time and the weighted acceleration of the whole vehicle is still within the threshold range, namely the weighted acceleration value of the whole vehicle is less than 0.5m/s2Then step 8 is entered.
And 8, reducing the working load of the engine, the combustion temperature and the combustion pressure in the cylinder by the aid of measures of delaying the ignition time of the spark plug, reducing the supercharging pressure of the supercharger and reducing the air inflow of the engine by the aid of the engine controller ECU, keeping the working load for a period of time, optimally setting the length of the keeping time period of the working load reduction according to specific conditions of the engine and the whole vehicle through tests, setting the working load reduction to be 80% of the original working load at the initial setting of 10-30 seconds generally, adjusting the set value according to the optimization results under different subsequent test conditions, and continuously detecting the occurrence condition of super-knock abnormal combustion and the smoothness of the whole vehicle within 5 seconds of the time period.
And 9, in the retention time of reducing the working load, the ECU checks the abnormal combustion condition of the super detonation, and simultaneously checks the weighted acceleration of the whole vehicle, if the abnormal combustion of the super detonation is not continuously generated within 5 seconds of the preset time or the weighted acceleration of the whole vehicle exceeds a threshold value, namely the weighted acceleration value of the whole vehicle exceeds 0.5m/s2And the engine controller ECU controls the fuel injection quantity, the valve overlap angle and the working load to be restored to the values before the super-knock abnormal combustion occurs, and quits the control of interrupting the enrichment of the mixed gas, reducing the valve overlap angle and reducing the working load. Within the holding time of reducing the working load, if the abnormal combustion of the super detonation continuously occurs for four times within 5 seconds of the preset time, and the weighted acceleration of the whole vehicle is still within the threshold range, namely the weighted acceleration value of the whole vehicle is less than 0.5m/s2The engine controller ECU controls the fuel injector to stop supplying fuel, measures the fuel cut in real time, and the fuel cut duration is generally initially set to 10 seconds to 30 seconds (10 seconds are taken as an example in the drawing). After the real-time fuel cut-off measure, the engine controller ECU continuously detects the abnormal combustion frequency of the super detonation until no super detonation is detectedUntil abnormal combustion occurs, confirming no abnormal combustion phenomenon of super detonation, or the weighted acceleration value of the whole vehicle exceeds 0.5m/s2And when the engine is started, the fuel cut-off control is withdrawn, the fuel supply is recovered, and the fuel injection quantity, the valve overlap angle and the working load are recovered to the values before the super-detonation abnormal combustion occurs.
Claims (6)
1. A super knocking abnormal combustion control processing method of a supercharged gasoline engine is characterized by comprising the following steps:
step 1, collecting a knock signal through a knock sensor, and processing the knock signal by a sensor signal processing module;
step 2, analyzing and judging the continuous occurrence frequency of super-knock abnormal combustion and the cylinder by the engine controller ECU through real-time online detection of the processed knock signal;
step 3, if the super-knock abnormal combustion is not detected, the engine controller ECU operates according to the original working condition and parameter setting, and if the super-knock abnormal combustion frequency in the cylinder is detected to be a first preset frequency, the step 4 is entered;
step 4, implementing a mixed gas enrichment control measure, namely increasing the oil injection quantity of an oil injector by increasing the oil injection time of the oil injector by an engine controller ECU, enriching the mixed gas of the next working cycle in the cylinder on the premise of keeping the air inflow unchanged so as to reduce the temperature in the cylinder, keeping the temperature for a period of time, and continuously detecting the occurrence condition of super-knock abnormal combustion and the weighted acceleration of the whole vehicle in the duration time of the enriched mixed gas;
step 5, in the duration of the enriched mixed gas, if the super detonation abnormal combustion is detected not to continue to occur in the preset time or the weighted acceleration of the whole vehicle exceeds a threshold value, the engine controller ECU controls the fuel injection quantity of the fuel injector to recover the fuel supply quantity value before the super detonation abnormal combustion and interrupts the measure of the enriched mixed gas,
if the number of times of continuously generating super knocking is detected to be the second preset number of times within the preset time and the weighted acceleration of the whole vehicle is within the threshold value range within the duration time of the enriched mixed gas, entering step 6;
step 6, controlling a variable valve timing mechanism by an engine controller ECU, reducing the valve phase overlap angle of an intake valve and an exhaust valve, keeping for a period of time to reduce the high-temperature residual waste gas amount in a cylinder, and continuously detecting the occurrence condition of super-knock abnormal combustion and the smoothness of the whole vehicle in the keeping time of adjusting the intake and exhaust VVT;
step 7, in the keeping time of adjusting the intake and exhaust VVT, if the super knock abnormal combustion is detected not to continue to occur in the preset time or the smoothness of the whole vehicle exceeds a threshold value, the engine controller ECU controls the fuel injection quantity and the valve overlap angle to recover to the values before the super knock abnormal combustion occurs, and quits the interruption of the mixed gas enrichment control measure and the valve overlap angle reduction control,
in the adjustment of the keeping time of the intake and exhaust VVT, if the times of continuously generating super-knock abnormal combustion are detected to be the third preset times in the preset time and the weighted acceleration of the whole vehicle is still in the threshold range, the step 8 is executed;
step 8, the engine controller ECU reduces the working load of the engine, the combustion temperature and pressure in the cylinder by means of retarding the ignition time of the spark plug, reducing the supercharging pressure of the supercharger and reducing the air inflow of the engine, keeps for a period of time, and continuously detects the abnormal combustion occurrence and normal smoothness of the super knock within the keeping time of reducing the working load;
step 9, in the holding time of reducing the working load, the engine controller ECU checks the abnormal combustion condition of the super detonation, and simultaneously checks the weighted acceleration of the whole vehicle, if the abnormal combustion of the super detonation is not continuously generated in the preset time or the weighted acceleration of the whole vehicle exceeds a threshold value, the engine controller ECU controls the fuel injection quantity, the valve overlap angle and the working load to be recovered to the values before the abnormal combustion of the super detonation, and the control of interrupting the enrichment of the mixed gas, reducing the valve overlap angle and reducing the working load is quitted,
and in the retention time of reducing the working load, if the number of times of continuously generating super-knock abnormal combustion is detected to be the fourth preset number of times in the preset time and the weighted acceleration of the whole vehicle is still in the threshold range, controlling the fuel injector to stop supplying fuel by the engine controller ECU, continuously detecting the super-knock abnormal combustion frequency by the engine controller ECU, recovering the fuel supply when confirming that no super-knock abnormal combustion exists or the weighted acceleration of the whole vehicle exceeds the threshold, and simultaneously recovering the fuel injection quantity, the valve overlap angle and the working load to the values before the super-knock abnormal combustion occurs.
2. The super knocking abnormal combustion control processing method for the supercharged gasoline engine as claimed in claim 1, wherein: the first preset number is that the number of times of detecting super-knock abnormal combustion in the cylinder is one, the second preset number is that the number of times of detecting super-knock abnormal combustion in the cylinder is two, the third preset number is that the number of times of detecting super-knock abnormal combustion in the cylinder is three, and the fourth preset number is that the number of times of detecting super-knock abnormal combustion in the cylinder is four.
3. The super knocking abnormal combustion control processing method for the supercharged gasoline engine as claimed in claim 1, wherein: the measure of performing the mixture enrichment control in the step 4 is to enrich the original equivalent mixture from 1ambda =1.0 to 1ambda =0.75, which is more beneficial to reducing the super-knock abnormal combustion tendency.
4. The super knocking abnormal combustion control processing method for the supercharged gasoline engine as claimed in claim 1, wherein: and according to an experimental optimization result, specifically reducing the workload in the step 8 to 80% of the original workload.
5. The super knocking abnormal combustion control processing method for the supercharged gasoline engine as claimed in claim 1, wherein: acceleration signals of the upper part of a seat cushion, a seat backrest and a foot supporting surface are collected through a finished automobile acceleration sensor, an effective value of the weighted acceleration of the finished automobile is obtained through calculation, and the smoothness of the finished automobile is judged according to the effective value.
6. The super knocking abnormal combustion control processing method for the supercharged gasoline engine as claimed in claim 5, wherein:
when the weighted acceleration of the whole vehicle is less than 0.35m/s2The smoothness of the whole vehicle is in a satisfactory state;
when the weighted acceleration of the whole vehicle is at 0.35m/s2To 0.5m/s2Between ranges, the ride comfort of the entire vehicle is in a slightly uncomfortable, but acceptable, state;
when the weighted acceleration of the whole vehicle is at 0.5m/s2To 1m/s2In the range, the smoothness of the whole vehicle is in an uncomfortable state.
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| CN113217203B (en) * | 2021-04-15 | 2023-09-22 | 联合汽车电子有限公司 | Engine super knock suppression method, storage medium, controller and system |
| CN114810395B (en) * | 2021-06-29 | 2023-05-26 | 长城汽车股份有限公司 | Engine control method and device and vehicle |
| CN114033561B (en) * | 2021-11-25 | 2023-12-15 | 奇瑞商用车（安徽）有限公司 | Control method of super knocking power assembly of supercharged gasoline engine |
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| CN103485911A (en) * | 2012-06-07 | 2014-01-01 | 铃木株式会社 | System for controlling combustion state in vehicle engine |
| CN104405510A (en) * | 2014-09-30 | 2015-03-11 | 长城汽车股份有限公司 | Control method and control system of engine, and vehicle |
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