CN110953079B - Method for eliminating knocking misjudgment after vehicle gear shifting - Google Patents

Method for eliminating knocking misjudgment after vehicle gear shifting Download PDF

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CN110953079B
CN110953079B CN201911229209.4A CN201911229209A CN110953079B CN 110953079 B CN110953079 B CN 110953079B CN 201911229209 A CN201911229209 A CN 201911229209A CN 110953079 B CN110953079 B CN 110953079B
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CN110953079A (en
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秦龙
徐凤
陈中天
王恺
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Dongfeng Motor Corp
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines

Abstract

The invention relates to a method for eliminating knocking misjudgment after vehicle gear shifting, which is used for judging whether the following conditions 1-5 are all met, if the conditions 1-5 are all met, engine knocking monitoring is carried out, otherwise, the engine knocking monitoring is not carried out; condition 1: the engine speed n is within a preset speed range; condition 2: the engine load is in a preset load range; condition 3: the water temperature of the engine is greater than a water temperature calibration value; condition 4: the combustion times of the engine are greater than a combustion time calibration value; condition 5: the engine flywheel end torque meets the condition A; the invention can accurately eliminate the misjudgment of the knocking after the vehicle is shifted and improve the accuracy of the knocking monitoring.

Description

Method for eliminating knocking misjudgment after vehicle gear shifting
Technical Field
The invention relates to the technical field of engine control, in particular to a method for eliminating knocking misjudgment after vehicle gear shifting.
Background
Knocking is a phenomenon in which abnormal noise is generated during operation of an engine, and is particularly emphasized in a spark ignition engine. The occurrence of knocking adversely affects the comfort of the user and the reliability of the engine. Therefore, suppression of knocking becomes an important issue in such a technical field. The engine control system promptly and appropriately retards the ignition advance angle after occurrence of knocking or in a case where knocking is likely to occur.
The knock control function is used to eliminate knock that may occur during combustion in the engine and optimize engine dynamics and fuel economy. However, in the process of knock detection, some misjudgment situations need to be eliminated, for example, in the process of acceleration after gear shifting, the gear meshing tooth surface of a transmission gear may change, or abnormal sound may occur due to the change from the non-meshing state of a throttle valve to the meshing state in the process of acceleration, so that knocking is mistakenly considered to occur, and therefore, the working condition causing the misjudgment of knocking needs to be eliminated, so that the situation that knocking is mistakenly considered to occur, an ignition angle is delayed, fuel economy and power performance are reduced, and the accuracy of knock monitoring is improved. At present, no method for effectively eliminating the misjudgment exists.
Disclosure of Invention
The invention aims to provide a method for eliminating knocking misjudgment after vehicle gear shifting, which can accurately eliminate the knocking misjudgment after the vehicle gear shifting and improve the accuracy of knocking monitoring.
In order to solve the technical problem, the invention discloses a method for eliminating knocking misjudgment after gear shifting of a vehicle, which is characterized by comprising the following steps of: the method comprises the steps of judging whether the following conditions 1, 2, 3, 4 and 5 are all met, if the conditions 1, 2, 3, 4 and 5 are all met, carrying out engine knock monitoring, and if not, not carrying out engine knock monitoring;
condition 1: the engine speed n is within a preset speed range;
condition 2: the engine load Rho is within a preset load range;
condition 3: water temperature Temp of engineCoolantIs greater than the water temperature calibration value;
condition 4: number of combustion times N of engineCombustionGreater than the combustion times calibration value;
condition 5: the flywheel end torque of the engine meets the condition A, and the condition A is determined by the following control flow:
step 1: judging the engine flywheel end request torque TReqChanging conditions within a sampling period; if the engine flywheel end requests torque TReqVariation < certain negative value T in sampling periodReqDelLimitIf the condition A is not satisfied; if the engine flywheel end requests torque TReqThe variation is more than or equal to a certain negative value T in the sampling periodReqDelLimitEntering the step 2 and the step 4;
step 2: accumulating engine flywheel end requested torque TReqThe variation is more than or equal to a certain negative value T in the sampling periodReqDelLimitTime t ofTorqueDeltaIf at the accumulated time tTorqueDeltaActual torque T at flywheel end of internal appearing engineActLess than a certain positive value TActLimitAnd adding up time tTorqueDeltaLess than a certain calibration time tDeltaDelayAt this time, knock monitoring is delayed, i.e., delayed accumulation time T1TorqueDelta＝tTorqueAdd+tTorqueDelta，tTorqueAddRepresenting delay time, and entering step 3;
and step 3: judging the accumulated time T1 after the delayTorqueDeltaWhether a certain time t is exceededlimitIf so, A1The condition is satisfied, and the accumulated time T1 after time delay is setTorqueDelta＝tlimitAnd a delay time tTorqueAdd0; if not, the condition A is not met, and the step 6 is entered;
and 4, step 4: adding up actual torque T at flywheel end of engineActNot less than a certain positive value TActLimitTime t ofTorqueNeg(ii) a If the actual torque T of the flywheel end of the engineAct< a certain positive value TActLimitIf the condition A is not met, entering the step 5;
and 5: judging the accumulation time tTorqueNegWhether or not it exceeds a certain value tNeglimitIf so, A2The condition is satisfied, and the accumulation time t is setTorqueNeg＝tNeglimit(ii) a If not, the condition A is not satisfied, and the step 6 is carried out;
step 6: judgment A1And A2Whether or not the conditions are simultaneously satisfied, if A1And A2If the conditions are simultaneously met, the condition A is met; otherwise, condition a is not satisfied.
The principle of the invention is as follows: after the occurrence of knocking, post-knocking treatment is performed, and as a result, both the power economy and the emission effect of the engine are reduced. The elimination of misjudged knocking can avoid abnormal knocking post-treatment of the engine, thereby ensuring the power economy and the emission effect of the engine to a certain extent.
The engine knock information monitored by the knock sensor is inaccurate under partial working conditions (such as knocking sound of a whole vehicle transmission system), and information which is mistaken for knocking under the working conditions needs to be extracted and eliminated. After the wrong knock signals are provided, accurate knock signals can be obtained, processing after knocking is carried out according to the accurate knock occurrence condition, operations such as ignition angle delaying, oil cut-off and the like are delayed, and damage to the engine caused by continuous knocking of the engine is avoided.
The invention can accurately eliminate the misjudgment of the knocking after the vehicle is shifted and improve the accuracy of the knocking monitoring.
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FIG. 1 is a logic flow diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
according to the method for eliminating the knocking misjudgment after the vehicle is shifted, as shown in fig. 1, whether the following conditions 1, 2, 3, 4 and 5 are all met or not is judged in an engine controller, if the conditions 1, 2, 3, 4 and 5 are all met, the engine knocking monitoring is carried out, otherwise (one of the 5 conditions is not met), the engine knocking misjudgment can be eliminated without carrying out the engine knocking monitoring;
condition 1: the engine speed n is within a preset speed range;
condition 2: the engine load Rho is within a preset load range;
condition 3: water temperature Temp of engineCoolantIs greater than the water temperature calibration value which is obtained by checking the starting water temperature Temp of the engineCoolantAtStartObtaining a table;
condition 4: number of combustion times N of engineCombustionIs greater than the combustion frequency calibration value which is obtained by checking the starting water temperature Temp of the engineCoolantAtStartObtaining a table;
condition 5: the flywheel end torque of the engine meets the condition A, and the condition A is determined by the following control flow:
step 1: firstly initializing all timer values, and then judging the engine flywheel end request torque TReqChange situation within a sampling period (10 ms); if the engine flywheel end requests torque TReqVariation < certain negative value T in sampling periodReqDelLimitAnd (-10Nm), the torque at the flywheel end is reduced greatly, the condition A is not met, the knock monitoring is not allowed, the torque of the engine is reduced greatly within 10Nm, the engine is decelerated and does not do work, and the working condition that the engine knocks appears under the working conditions of acceleration and work. In this time, the knocking cannot be monitored, and the processing of knocking misjudgment and elimination is avoided; if the engine flywheel end requests torque TReqThe variation is more than or equal to a certain negative value T in the sampling periodReqDelLimitThen, thenEntering the step 2 and the step 4;
step 2: accumulating engine flywheel end requested torque TReqThe variation is more than or equal to a certain negative value T in the sampling periodReqDelLimitTime t ofTorqueDeltaIf at the accumulated time tTorqueDeltaActual torque T at flywheel end of internal appearing engineActLess than a certain positive value TActLimit(10Nm) and accumulating the time tTorqueDeltaLess than a certain calibration time tDeltaDelay(0.3s) indicating that the torque direction may change, and the knock detection is delayed, i.e. the knock occurred in the accumulation time is wrong, and needs to be eliminated, and the knock detection is started after the accumulation time delay is over, i.e. the delayed accumulation time T1TorqueDelta＝tTorqueAdd+tTorqueDelta，tTorqueAddRepresenting delay time, and entering step 3;
and step 3: judging the accumulated time T1 after the delayTorqueDeltaWhether a certain time t is exceededlimit(0.3s), if it exceeds, A1The condition is satisfied, and the accumulated time T1 after time delay is setTorqueDelta＝tlimitAnd a delay time tTorqueAdd0 (one reset and set operation is performed after condition a1 is satisfied); if not, the condition A is not met, the knocking monitoring is not allowed, and the step 6 is entered;
and 4, step 4: adding up actual torque T at flywheel end of engineActNot less than a certain positive value TActLimitTime t at (10Nm)TorqueNeg(ii) a If the actual torque T of the flywheel end of the engineAct< a certain positive value TActLimitIf the condition A is not met, the detonation monitoring is not allowed (the working condition that the engine knocks appears under the working conditions of acceleration and work, the actual flywheel end torque of the engine is increased in the process of acceleration and work, and if the working condition is larger and smaller, the engine does not work), and the step 5 is carried out;
and 5: judging the accumulation time tTorqueNegWhether or not it exceeds a certain value tNeglimitIf so, A2The condition is satisfied, and the accumulation time t is setTorqueNeg＝tNeglimit(a reset and set operation is performed after condition a1 is satisfied); if not, the condition A is not met, the knock monitoring is not allowed, and the step 6 is carried out;
step 6: judgment A1And A2Whether or not the conditions are simultaneously satisfied, if A1And A2If the conditions are simultaneously met, the condition A is met; otherwise, condition a is not satisfied and knock monitoring is not permitted.
In the step 6, in the acceleration process after the gear shifting, the gear engaging tooth surface of the transmission may change, or the gear engaging tooth surface may change from the non-engaging state of the throttle valve to the engaging state in the acceleration process, so that abnormal noise may occur, and knocking may be mistakenly considered to occur, so that the operating condition that the knocking is mistakenly judged needs to be eliminated, and when the operating condition that the knocking is possibly mistakenly judged occurs, the actual torque of the engine needs to go through the process from negative to positive. Condition a1 is a determination of whether the engine torque is negative, and condition a2 is a determination of whether the engine torque goes from negative to positive. However, in the process of this determination, other signals are needed to assist monitoring to ensure the accuracy of monitoring.
If the conditions 1-4 are not met, the working performance of the engine is unstable, and knocking cannot be accurately detected.
In the step 1, the timer refers to a timing function in the controller (which may be an engine controller) using the present invention, and it performs timing management on each signal with time requirement.
In the above condition 3, the engine starting water temperature is the engine water temperature when the engine speed is not 0 for the first time at the time of engine start (the engine speed before start is 0 and after start is not 0 in the description of the start of the engine).
Figure BDA0002303083870000051
When the starting water temperature is lower than minus 30 ℃, the requirement of the engine calibration water temperature meeting the conditions exceeds 45 ℃; when the starting water temperature is higher than 50 ℃, the water temperature of the engine meeting the conditions is required to exceed 58 ℃. And the starting water temperature in the middle of the table is linearly interpolated (i.e. if the starting water temperature is 10 degrees, then the desired calibration water temperature is linearly interpolated between the calibration water temperatures 50 and 53 corresponding to the starting water temperatures 0 and 15 degrees).
In the above condition 4, the number of engine combustion times is the sum of all the ignition times of the respective cylinders, and does not include the ignition timing at the time of misfire.
Temperature of starting water -30 -15 0 15 30 50
Number of combustion 5000 4500 3000 500 300 200
When the temperature of the starting water is lower than minus 30 ℃, the requirement of the combustion frequency calibration value meeting the conditions exceeds 5000 times; when the starting water temperature is higher than 50 ℃, the combustion frequency calibration value meeting the conditions is required to exceed 200 times. And the starting water temperature in the middle of the table is linearly interpolated (the interpolation principle is the same as the above, namely, the required calibration combustion times can be found for any starting water temperature).
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Claims (8)

1. A method for eliminating knocking misjudgment after vehicle gear shifting is characterized in that: judging whether the following conditions 1-5 are all met, if the conditions 1-5 are all met, carrying out engine knock monitoring, otherwise, not carrying out engine knock monitoring;
condition 1: the engine speed n is within a preset speed range;
condition 2: the engine load Rho is within a preset load range;
condition 3: water temperature Temp of engineCoolantIs greater than the water temperature calibration value;
condition 4: number of combustion times N of engineCombustionGreater than the combustion times calibration value;
condition 5: the flywheel end torque of the engine meets the condition A, and the condition A is determined by the following control flow:
step 1: judging the engine flywheel end request torque TReqChanging conditions within a sampling period; if the engine flywheel end requests torque TReqVariation < certain negative value T in sampling periodReqDelLimitIf the condition A is not satisfied; if the engine flywheel end requests torque TReqThe variation is more than or equal to a certain negative value T in the sampling periodReqDelLimitEntering the step 2 and the step 4;
step 2: accumulating engine flywheel end requested torque TReqThe variation is more than or equal to a certain negative value T in the sampling periodReqDelLimitTime t ofTorqueDeltaIf at the accumulated time tTorqueDeltaActual torque T at flywheel end of internal appearing engineActLess than a certain positive value TActLimitAnd adding up time tTorqueDeltaLess than a certain calibration time tDeltaDelayAt this time, knock monitoring is delayed, i.e., delayed accumulation time T1TorqueDelta＝tTorqueAdd+tTorqueDelta，tTorqueAddRepresenting delay time, and entering step 3;
and step 3: judging the accumulated time T1 after the delayTorqueDeltaWhether a certain time t is exceededlimitIf so, A1The condition is satisfied, and the accumulated time T1 after time delay is setTorqueDelta＝tlimitAnd a delay time tTorqueAdd0; if not, the condition A is not met, and the step 6 is entered;
and 4, step 4: adding up actual torque T at flywheel end of engineActNot less than a certain positive value TActLimitTime t ofTorqueNeg(ii) a If the actual torque T of the flywheel end of the engineAct< a certain positive value TActLimitIf the condition A is not met, entering the step 5;
and 5: judging the accumulation time tTorqueNegWhether or not it exceeds a certain value tNeglimitIf so, A2The condition is satisfied, and the accumulation time t is setTorqueNeg＝tNeglimit(ii) a If not, the condition A is not satisfied, and the step 6 is carried out;
step 6: judgment A1And A2Whether or not the conditions are simultaneously satisfied, if A1And A2If the conditions are simultaneously met, the condition A is met; otherwise, condition a is not satisfied.
2. The method for eliminating knocking misjudgment after a vehicle shift according to claim 1, characterized in that: the preset rotating speed range in the condition 1 is 650-6000 rpm.
3. The method for eliminating knocking misjudgment after a vehicle shift according to claim 1, characterized in that: the preset load range in the condition 2 is 500-3000 mg/l.
4. The method for eliminating knocking misjudgment after a vehicle shift according to claim 1, characterized in that: in the condition 5, a negative value T is definedReqDelLimitIs-10 Nm; a certain positive value TActLimitIs 10 Nm.
5. The method for eliminating knocking misjudgment after a vehicle shift according to claim 1, characterized in that: in the above condition 5, the predetermined calibration time tDeltaDelay0.3s for a certain time tlimitIt was 0.3 s.
6. The method for eliminating knocking misjudgment after a vehicle shift according to claim 1, characterized in that: the whole judgment process of the conditions 1-5 is carried out in an engine controller.
7. The method for eliminating knocking misjudgment after a vehicle shift according to claim 1, characterized in that: in the above condition 3, the water temperature calibration value is obtained by checking the engine starting water temperature TempCoolantAtStartThe table is obtained.
8. The method for eliminating knocking misjudgment after a vehicle shift according to claim 4, characterized in that: in the above condition 4, the combustion frequency calibration value is obtained by checking the engine starting water temperature TempCoolantAtStartThe table is obtained.
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US9441556B2 (en) * 2013-03-15 2016-09-13 GM Global Technology Operations LLC Noise updating systems and methods
US10077041B1 (en) * 2017-03-20 2018-09-18 Ford Global Technologies, Llc Variable compression ratio engine
KR102463458B1 (en) * 2017-12-20 2022-11-04 현대자동차주식회사 System for Detecting Knock and Pre-Ignition and Method Thereof
US10267256B1 (en) * 2018-02-20 2019-04-23 Ford Global Technologies, Llc Method and system for knock control
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