CN112112736A - Control method for reducing super detonation frequency - Google Patents
Control method for reducing super detonation frequency Download PDFInfo
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- CN112112736A CN112112736A CN202010902198.8A CN202010902198A CN112112736A CN 112112736 A CN112112736 A CN 112112736A CN 202010902198 A CN202010902198 A CN 202010902198A CN 112112736 A CN112112736 A CN 112112736A
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- engine
- super
- frequency
- control method
- reducing
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
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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
- F02D41/0002—Controlling intake air
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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
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
Abstract
The invention discloses a control method for reducing super detonation frequency, which comprises the following steps: 1) judging whether the working condition of the engine is in a super detonation high-frequency area, if so, turning to the step 2); 2) the throttle is controlled to decrease at a set rate until engine operating conditions are in a safe region. The method of the invention can effectively reduce the occurrence of super knock by detecting the working condition of the engine to avoid the super knock high-frequency area, does not generate additional part cost, and can be realized by software.
Description
Technical Field
The invention relates to an automobile control technology, in particular to a control method for reducing super detonation frequency.
Background
With the gradual tightening of oil consumption emission regulations, a small-displacement supercharged direct injection engine is developed and applied by various large automobile companies by the characteristics of low oil consumption and strong power, but the supercharged direct injection engine is easy to generate abnormal combustion phenomenon, namely super detonation, which greatly harms the engine at low speed and high load, when the super detonation occurs, the maximum explosion pressure of the engine is far higher than the normal combustion pressure, and large-amplitude pressure oscillation occurs, so that the engine is easy to damage.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method for reducing the frequency of super knocking aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a control method for reducing super knock frequency comprises the following steps:
1) judging whether the working condition of the engine is in a super detonation high-frequency area, if so, turning to the step 2);
2) the throttle is controlled to decrease at a set rate until engine operating conditions are in a safe region.
According to the scheme, the super-knock high-frequency region in the step 1) is determined according to the super-knock high-frequency region which contains most super-knock working points and has the smallest range.
According to the scheme, whether the working condition of the engine is in the super knocking high-frequency region or not is judged in the step 1), and the method specifically comprises the following steps:
1.1) judging whether the engine rotating speed is in a set interval, wherein the set interval is a rotating speed range corresponding to a super-knock high-frequency region boundary;
1.2) judging whether the engine load exceeds a set load threshold value;
and if the conditions are met, judging that the working condition of the engine is in a super knocking high-frequency region.
According to the scheme, the load threshold in the step 1.2) is a characteristic curve taking the engine speed as input, and different engine speeds correspond to different thresholds.
According to the scheme, the engine load in the step 1.2) is determined according to the engine air charging coefficient when the engine runs.
According to the scheme, the set interval of the engine speed in the step 1.1) is 1500-3000 revolutions.
According to the scheme, the load threshold value in the step 1.2) is larger than 1.3.
According to the scheme, whether the working condition of the engine is in a safe region or not is judged in the step 2) according to the load of the engine.
According to the scheme, the engine load threshold for judging whether the working condition of the engine is in the safe region in the step 2) is obtained by taking the safe margin of the threshold in the step 1.2).
According to the scheme, the engine load threshold for judging whether the working condition of the engine is in the safe area in the step 2) is 0.9 times of the threshold in the step 1.2).
The invention has the following beneficial effects:
the invention can effectively reduce the occurrence of super knock by detecting the working condition of the engine to avoid a super knock high-frequency area, does not generate additional part cost, and can be realized by software.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a super-detonation high frequency region of an embodiment of the invention;
fig. 3 is a schematic diagram of values of super knock thresholds according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The super detonation has obvious characteristics, and is easier to occur in a low-rotating-speed high-load area, namely a super detonation high-frequency area. According to the invention, the operating condition of the engine does not enter a super-knock high-frequency region by controlling the opening of the throttle valve, so that the aim of reducing the super-knock frequency is fulfilled.
As shown in fig. 1, a control method for reducing the frequency of super knock comprises the following steps:
1) judging whether the working condition of the engine is in a super detonation high-frequency area, if so, turning to the step 2);
the super-knock high-frequency region is determined according to the super-knock high-frequency region which contains most super-knock working condition points and has the minimum range;
judging whether the working condition of the engine is close to a super knocking high-frequency region or not, specifically as follows:
1.1) judging whether the engine rotating speed is in a set interval, wherein the set interval is a rotating speed range corresponding to a super-knock high-frequency region boundary;
1.2) judging whether the engine load exceeds a set load threshold value;
if the conditions are met, judging whether the working condition of the engine is close to a super-knock high-frequency region;
when the engine normally operates, judging whether the rotating speed of the engine is greater than a threshold value A and less than a threshold value B, namely judging whether the rotating speed of the engine is in a specific interval; and meanwhile, judging whether the load of the engine exceeds a threshold value C or not, and judging whether the working condition of the engine is close to a super-knock high-frequency region or not through the step. The load threshold C is a characteristic curve taking the engine speed as input, and different engine speeds correspond to different thresholds.
For the determination of the boundary of the high frequency region, namely the acquisition of the A, B, C threshold, a statistical method can be adopted to sweep the full operating points of the engine, the engine speed is counted from 800 to the highest speed such as 6000, the load is counted from the lowest to the highest such as 1.8, and the occurrence frequency of super knock is counted under all operating points of the engine. According to the experimental statistics, a super knock high frequency region can be obtained, the rotating speed range is usually 1500-3000 revolutions, and the load is usually more than 1.3 according to different rotating speeds. The value of the threshold A/B/C is determined according to the boundary of the high-frequency region, and the boundary of the high-frequency region is the boundary which contains most super-knock operating points and has the smallest range. The threshold C is a curve of the corresponding relationship between the rotation speed and the load, which is established according to the boundary load characteristic point, as shown in fig. 3.
2) The throttle is controlled to decrease at a set rate until engine operating conditions are in a safe region.
After the working condition of the engine is judged to be close to a super knock high-frequency region (namely, the working condition of the engine is in or enters the boundary of the super knock high-frequency region), the engine enters a specific mode, and the system controls the throttle to be reduced according to a set rate.
When the engine runs, the engine charge coefficient is expressed as the ratio of the mass of fresh gas entering a cylinder to the mass of fresh gas filling the cylinder under the standard atmospheric pressure state, and represents the current working load of the engine.
And (3) along with the reduction of the opening of the throttle valve, reducing the air entering the engine cylinder, reducing the load of the engine, judging whether the load of the engine is smaller than a threshold value D by the system, and judging whether the working condition of the engine is far away from a super knocking high-frequency region. The load threshold value D is a characteristic curve taking the engine speed as input, and different engine speeds correspond to different threshold values. The threshold D is obtained by reserving a certain safety margin on the basis of the threshold C, for example, by multiplying the threshold C by 0.9. As shown in fig. 2.
The method can effectively reduce the occurrence of the super detonation by avoiding the super detonation high-frequency area, does not generate additional part cost, and can be realized through software. The super-detonation engine can reduce the power torque of the engine under the characteristic working condition while reducing the super-detonation frequency, and loses certain engine power, but compared with the damage of super-detonation, the super-detonation frequency is reduced by losing part of the power torque, and the super-detonation frequency reducing method is also a solution.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A control method for reducing super knock frequency is characterized by comprising the following steps:
1) judging whether the working condition of the engine is in a super detonation high-frequency area, if so, turning to the step 2);
2) the throttle is controlled to decrease at a set rate until engine operating conditions are in a safe region.
2. The control method for reducing the super knock frequency according to claim 1, wherein the super knock high frequency region in step 1) is determined according to a super knock high frequency region which contains most of super knock operating points and has the smallest range.
3. The control method for reducing the super knock frequency according to claim 1 or 2, wherein in the step 1), whether the engine working condition is in a super knock high frequency region is judged, and the following specific steps are performed:
1.1) judging whether the engine rotating speed is in a set interval, wherein the set interval is a rotating speed range corresponding to a super-knock high-frequency region boundary;
1.2) judging whether the engine load exceeds a set load threshold value;
and if the conditions are met, judging that the working condition of the engine is in a super knocking high-frequency region.
4. The control method for reducing the frequency of super knocking according to claim 3, wherein the load threshold in step 1.2) is a characteristic curve with engine speed as input, and different engine speeds correspond to different thresholds.
5. The control method for reducing the frequency of super knocking according to claim 3, wherein the engine load in step 1.2) is determined according to the engine charge coefficient when the engine is running.
6. The control method for reducing the frequency of super knocking according to claim 3, wherein the engine speed in step 1.1) is set to an interval of 1500 to 3000 revolutions.
7. The control method for reducing the frequency of super knocking according to claim 3, wherein the load threshold in step 1.2) is greater than 1.3.
8. The control method for reducing the super knock frequency according to claim 1, wherein in the step 2), whether the engine working condition is in a safe region is judged according to the engine load.
9. The control method for reducing the frequency of super knocking according to claim 3, wherein the engine load threshold for determining whether the engine operating condition is in a safe region in step 2) is obtained by taking a safe margin for the threshold in step 1.2).
10. The control method for reducing the frequency of super knocking according to claim 3, wherein the engine load threshold for determining whether the engine operating condition is in the safe region in step 2) is 0.9 times the threshold in step 1.2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010902198.8A CN112112736A (en) | 2020-09-01 | 2020-09-01 | Control method for reducing super detonation frequency |
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| CN202010902198.8A CN112112736A (en) | 2020-09-01 | 2020-09-01 | Control method for reducing super detonation frequency |
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| CN202010902198.8A Pending CN112112736A (en) | 2020-09-01 | 2020-09-01 | Control method for reducing super detonation frequency |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334846A (en) * | 2013-07-23 | 2013-10-02 | 清华大学 | Method for judging and controlling super detonation |
| 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 |
| CN105386882A (en) * | 2015-10-26 | 2016-03-09 | 重庆长安汽车股份有限公司 | Preignition control method for supercharge non-direct-injection gasoline engine |
| US20200263651A1 (en) * | 2019-02-20 | 2020-08-20 | King Abdullah University Of Science And Technology | Internal combustion engines having super knock mitigation controls and methods for their operation |
-
2020
- 2020-09-01 CN CN202010902198.8A patent/CN112112736A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334846A (en) * | 2013-07-23 | 2013-10-02 | 清华大学 | Method for judging and controlling super detonation |
| 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 |
| CN105386882A (en) * | 2015-10-26 | 2016-03-09 | 重庆长安汽车股份有限公司 | Preignition control method for supercharge non-direct-injection gasoline engine |
| US20200263651A1 (en) * | 2019-02-20 | 2020-08-20 | King Abdullah University Of Science And Technology | Internal combustion engines having super knock mitigation controls and methods for their operation |
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Application publication date: 20201222 |
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