CN113309622B - Engine emission deterioration suppressing apparatus and engine emission deterioration suppressing method - Google Patents
Engine emission deterioration suppressing apparatus and engine emission deterioration suppressing method Download PDFInfo
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- CN113309622B CN113309622B CN202010119320.4A CN202010119320A CN113309622B CN 113309622 B CN113309622 B CN 113309622B CN 202010119320 A CN202010119320 A CN 202010119320A CN 113309622 B CN113309622 B CN 113309622B
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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
- 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1459—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a hydrocarbon content or concentration
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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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)
Abstract
The present invention relates to an engine emission deterioration suppressing apparatus and an engine emission deterioration suppressing method. The engine emission deterioration suppression device includes: a deterioration criterion setting unit that sets a deterioration criterion value of the engine based on the ignition advance angle, the exhaust gas temperature, and the rotation speed recorded at a normal wear period of the engine; a deterioration determination means for comparing the currently acquired ignition advance angle, exhaust gas temperature, and rotation speed with the deterioration determination standard value set by the deterioration standard setting means, and determining that the engine is deteriorated when a predetermined determination condition is satisfied; and an air intake amount correction unit that calculates a correction amount of the air intake amount when the degradation determination unit determines that the engine is degraded, and corrects the air intake amount by the correction amount.
Description
Technical Field
The present invention relates to an engine emission deterioration suppressing technology, and more particularly, to an engine emission deterioration suppressing apparatus and an engine emission deterioration suppressing method.
Background
After the new vehicle is delivered and used, the engine inevitably suffers from abrasion, dirt blockage and the like due to long-time work after the driving distance reaches a certain mileage. This may cause an error in the air intake amount of the engine.
When the engine is in an open loop control stage and does not enter a closed loop feedback control after the engine is completely exploded, the rotation speed continuously drops due to the fact that the air inflow does not reach the requirement, and the target rotation speed cannot be reached. In the conventional control logic, the engine increases the ignition advance angle to increase the engine speed with the amount of air intake unchanged.
Disclosure of Invention
Technical problem to be solved by the invention
However, the following problems occur when using existing control logic: increasing the ignition advance angle can lead to a decrease in exhaust temperature, lead to a slow temperature rise of the catalyst at the three-way catalyst, fail to reach the optimal operating temperature quickly, lead to poor emission, increase hydrocarbons, and fail to meet the requirements of emission regulations.
The present invention has been made to solve the above-described problems, and an object thereof is to provide an engine emission deterioration suppressing apparatus and an engine emission deterioration suppressing method for suppressing deterioration of engine emission.
Technical proposal for solving the technical problems
The present invention relates to an engine emission deterioration suppressing apparatus, comprising: a deterioration criterion setting unit that sets a deterioration criterion value of an engine based on an ignition advance angle, an exhaust gas temperature, and a rotation speed recorded at a normal wear period of the engine; a deterioration determination unit that compares a currently acquired ignition advance angle, exhaust gas temperature, and rotation speed with the deterioration determination criterion value set by the deterioration criterion setting unit, and determines that the engine is deteriorated when a predetermined determination condition is satisfied; and an air intake amount correction unit that calculates a correction amount of the air intake amount when the degradation determination unit determines that the engine is degraded, and corrects the air intake amount using the correction amount.
Preferably, in the engine emission deterioration suppressing apparatus, the deterioration determining unit determines whether the engine is deteriorated after a vehicle mileage exceeds a prescribed value.
Preferably, in the engine emission deterioration suppressing apparatus, the deterioration criterion setting means records an ignition advance angle, an exhaust gas temperature, and a rotation speed for a predetermined time after the engine is started.
Preferably, in the engine emission deterioration suppressing apparatus, the deterioration criterion setting unit repeatedly records the ignition advance angle, the exhaust gas temperature, and the rotation speed a prescribed number of times during a normal wear period of the engine, and calculates an average value as the deterioration criterion value.
Preferably, in the engine emission deterioration suppressing apparatus, the deterioration criterion setting means deletes the current recording value and exits the current recording operation when the change in the demanded intake air amount is equal to or greater than a predetermined value or when the sensor for acquiring the recording values of the ignition advance angle, the exhaust temperature, and the rotation speed has no feedback or feedback error signal.
Preferably, in the engine emission deterioration suppressing apparatus, the deterioration determining means determines that the engine is deteriorated when it is determined that the predetermined determination condition is satisfied a predetermined number of times in succession.
Preferably, in the engine emission deterioration suppressing apparatus, the deterioration determining means sets a sensitivity for performing ignition timing comparison, a sensitivity for performing exhaust gas temperature comparison, and a sensitivity for performing rotation speed comparison in the predetermined determination condition.
Preferably, in the engine emission deterioration suppressing apparatus, the sensitivity for performing the ignition advance angle comparison is in a range of 0 to 12.
Preferably, in the engine emission deterioration suppressing apparatus, the sensitivity for performing the exhaust gas temperature comparison is in a range of 0 to 1.
Preferably, in the engine emission deterioration suppressing apparatus, the sensitivity for performing the rotation speed comparison has a value ranging from 0.6 to 1.
Preferably, in the engine emission deterioration suppression device, the air intake amount correction unit calculates the correction amount based on a rotational speed dispersion at the time of starting the engine.
The invention also relates to a method for suppressing deterioration of engine emission, comprising the steps of: a deterioration criterion setting step of setting a deterioration criterion value of an engine based on an ignition advance angle, an exhaust gas temperature, and a rotation speed recorded at a normal wear period of the engine; a degradation determination step of comparing the currently acquired ignition advance angle, exhaust gas temperature, and rotation speed with the degradation determination criterion value set in the degradation criterion setting step, and determining that the engine is degraded when a predetermined determination condition is satisfied; and an air intake amount correction step of calculating a correction amount of the air intake amount when the degradation determination step determines that the engine is degraded, and correcting the air intake amount by using the correction amount.
The present invention also relates to a storage medium storing a program for causing a computer to execute the above-described engine emission deterioration suppression method.
Effects of the invention
According to the engine emission deterioration suppressing apparatus and the engine emission deterioration suppressing method of the present invention, by setting the engine deterioration determination criterion and performing the air intake amount correction when it is determined that the engine is deteriorated, the deterioration of the engine emission is suppressed by avoiding the decrease in the engine rotation speed and the decrease in the exhaust temperature.
Drawings
Fig. 1 is a block diagram showing the configuration of an engine emission deterioration suppression device according to the present invention.
Fig. 2 is a characteristic diagram showing various parameters of the engine in the normal wear period of the engine.
Fig. 3 is a flowchart showing the overall operation of the engine emission deterioration suppression device according to the present invention.
Fig. 4 is a flowchart showing operations of data recording and processing in the degradation criterion setting step.
Fig. 5 is a flowchart showing an operation in the degradation determination step.
Fig. 6 is a flowchart showing the operation of adding air.
Fig. 7 is a hardware configuration diagram showing an engine control device to which the engine emission degradation suppression device according to the present invention is applied.
Detailed Description
In the following, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
First, a specific configuration of the engine emission deterioration suppression device according to the present embodiment will be described with reference to fig. 1.
The engine emission deterioration suppressing apparatus 1 is configured to include a deterioration criterion setting unit 11, a deterioration determining unit 12, and an air intake amount correcting unit 13.
The degradation criterion setting unit 11 sets a degradation criterion value of the engine based on the ignition advance angle, the exhaust gas temperature, and the rotation speed recorded at the normal wear period of the engine.
After the engine is assembled, the engine is mainly divided into three stages of a running-in abrasion stage, a normal abrasion stage and a collapse abrasion stage. In the running-in abrasion stage, the surface of the new machine body machine part has certain roughness, and the abrasion of the matching surface is faster. In the normal wear stage, after the running-in period, the wear speed is reduced, the wear amount is stable, and the wear amount is kept to be uniformly increased in a long period. In the breakdown wear phase, the wear limit point is reached, the oil film is broken and the machine parts are to be broken.
Fig. 2 is a characteristic diagram showing various parameters of the engine in the normal wear period of the engine. The deterioration criterion setting unit 11 records corresponding data in a prescribed time after the engine is started for the ignition advance angle, the exhaust gas temperature, and the rotation speed of the engine in the normal wear period, and sets an engine deterioration criterion value.
Specifically, after the engine is started (10 ℃ C. To 40 ℃ C.), the engine is divided into three sections of 10 ℃ C. To 20 ℃ C., 30 ℃ C. To 40 ℃ C., according to the difference of the water temperature at the time of starting, corresponding data of the rotation speed, the exhaust temperature and the ignition advance angle in 0 to 10 seconds, 11 to 20 seconds and 21 to n seconds (n seconds is n.ltoreq.50 before the start of closed loop feedback control) are recorded, and the data are filled in the following table 1.
TABLE 1
Map1 to map9 in table 1 are in the form of the following table (the data in the table are all exemplified).
In addition, in order to ensure accuracy while avoiding errors, it is preferable to repeatedly record data N times (e.g., n.gtoreq.5).
When there is a large change in the demanded intake air amount in the middle of the vehicle (the change in the demanded intake air amount is equal to or greater than a predetermined value, for example, 10 liters or more), or when there is no feedback or feedback error signal from a sensor for acquiring the recorded values of the ignition advance angle, the exhaust temperature, and the rotational speed, the recorded value of this time is deleted, and the recording operation of this time is exited. Cases where the demanded intake air amount varies greatly include shifting, switching air conditioning, running, and the like, and cases where the sensor has no feedback or feedback error signal include misfire, knocking, sensor failure, and the like.
In the case of repeatedly recording data N times, an average value is obtained as the degradation determination standard value. Specifically, after the completion of N times of data recording, the following averaging process is performed.
1. In the water temperature range, the averaging process is completed with an intermediate value (for example, 15 ℃ is taken from the range of 10 ℃ to 20 ℃).
2. The map data in the table obtained N times is averaged (i.e., the values of the rotational speed, the exhaust gas temperature, and the ignition advance angle obtained at the same time and in the same temperature interval are accumulated and divided by the number of times of recording to obtain an average value).
Table 2 below was obtained by the above-described averaging treatment.
TABLE 2
Map1 to map9 in Table 2 are each in the form of a thumbnail of the following chart.
Ai, bi, ci (i=1 to n) in the above table are set as a degradation criterion value of the rotation speed, a degradation criterion value of the exhaust temperature, and a degradation criterion value of the ignition timing, respectively.
Next, the degradation determination means 12 compares the currently acquired ignition advance angle, exhaust gas temperature, and rotation speed with the degradation determination standard value set by the degradation standard setting means 11, and determines that the engine is degraded when a predetermined determination condition is satisfied.
The degradation determination unit 12 preferably performs degradation determination after the vehicle mileage exceeds a predetermined value (for example, 3500 KM to 4000 KM). Further, this determination may be made every time the engine is started cold. Specifically, the ignition advance angle, the exhaust gas temperature, and the rotation speed in n seconds after the start of the engine cold (n seconds is n.ltoreq.50 before the start of the closed-loop feedback control) are recorded, and the currently acquired ignition advance angle, exhaust gas temperature, and rotation speed are compared with the degradation criterion value set by the degradation criterion setting unit 11.
The degradation determination unit 12 calls the degradation determination standard value corresponding to table 2 according to the different water temperature range in which the initial water temperature of the vehicle is at the time of starting. For example, when the initial water temperature is 10 to 20 ℃, the corresponding degradation criterion value (degradation criterion value of each of the rotation speed, the exhaust temperature, and the ignition advance angle) of the water temperature set in the degradation setting unit 11 is 15 ℃ is called, when the initial water temperature is 20 to 30 ℃, the corresponding degradation criterion value of the water temperature set in the degradation setting unit 11 is 25 ℃, and when the initial water temperature is 30 to 40 ℃, the corresponding degradation criterion value of the water temperature set in the degradation setting unit 11 is 35 ℃ is called.
After the degradation determination standard values corresponding to table 2 are called, the degradation determination unit 12 performs the following comparison operation.
1) Ignition advance angle contrast
The ignition advance angle comparison is performed by the following formula (1).
Wherein n: predetermined recording time(s)
θi (i=1 to n): the ignition advance angle (deg) of the ith second of the current record
ci (i=1 to n): deterioration judgment standard value (deg) of ignition advance angle
X: sensitivity (deg/s) for ignition advance angle contrast
The value of parameter X may be preset. The smaller the value of X, the more sensitive the determination. Since the ignition advance angle does not exceed 12 °, the value of X is preferably in the range of 0 to 12. The value range of X is more preferably 0 to 8 based on the engine being pre-ignited.
2) Exhaust gas temperature comparison
The exhaust gas temperature comparison is performed by the following formula (2).
Wherein n: predetermined recording time(s)
Ti (i=1 to n): the exhaust temperature (. Degree. C.) of the ith second recorded this time
bi (i=1 to n): deterioration determination criterion value (DEG C) of exhaust gas temperature
Y: sensitivity for exhaust gas temperature comparison
The value of the parameter Y may be preset. The smaller the value of Y, the more sensitive the determination. The exhaust temperature of an engine typically does not exceed 850 ℃ based on emissions regulations and exhaust pipe materials. Above this temperature, the engine may actively thicken the mixture to reduce the exhaust temperature. Comprehensively considering the temperature rising requirement of the catalyst, the exhaust temperature is generally 700-850 ℃. Thus, the value of Y is preferably in the range of 0 to 1.
3) Comparison of rotational speeds
The rotation speed comparison is performed by the following formula (3).
Wherein n: predetermined recording time(s)
ki (i=21 to n): the rotation speed (rpm) of the ith second of the current record
ai (i=21 to n): deterioration determination criterion value (rpm) of rotation speed
Z: sensitivity for speed comparison
The value of the parameter Z may be preset. The larger the value of Z, the more sensitive the determination. The idle rotation speed of the vehicle is generally about 600 to 800rpm, and the larger the number of cylinders, the smaller the idle rotation speed can be. Also, the minimum engine speed is generally not lower than 500rpm, and when lower than 500rpm, there is a risk of shutdown. Accordingly, the value of Z is preferably in the range of 0.6 to 1. In view of the fact that the engine speed is too low, the engine may actively increase the ignition advance angle to increase the speed, and therefore the value of Z is more preferably in the range of 0.8 to 1.
By the above ignition advance angle comparison, exhaust gas temperature comparison, and rotation speed comparison, the deterioration determination unit 12 determines that the engine is deteriorated when three determination conditions are simultaneously satisfied.
The degradation determination unit 12 may be configured to determine that the engine is degraded when the above degradation determination is established a predetermined number of times (for example, 5 times).
Specifically, the engine degradation flag #eng is set, and if the above degradation determination is established a predetermined number of times (for example, 5 times), #eng=1 is set, and the subsequent correction of the air intake amount is performed. If the determination is not made a predetermined number of times, #eng=0 is directly called to correct the air intake amount.
In addition, when there is a large change in the demanded intake air amount in the middle of the vehicle (the change in the demanded intake air amount is equal to or greater than a predetermined value, for example, 10 liters or more), or when there is no feedback or feedback error signal from a sensor for acquiring the recorded values of the ignition advance angle, the exhaust temperature, and the rotational speed, the recorded value of this time is deleted, and the present determination behavior is exited.
Next, when the degradation determination unit 12 determines that the engine is degraded, the air intake amount correction unit 13 calculates a correction amount of the air intake amount, and corrects the air intake amount by the correction amount.
Specifically, when the degradation determination is established, the correction amount (initial value of 0) of the air intake amount is calculated by the following equation (4).
Correction amount= (1- (average value of recorded rotation speed+learning value)/target rotation speed)
* Basic air inflow (4)
Wherein the average value of the recorded rotational speeds: average value of engine speed after explosion (data of N times, speed in 21-N seconds) in deterioration judging process
The learning value a is the degree of dispersion of the recording rotational speed with respect to the degradation determination standard value of the rotational speed, and the variance concept in mathematics is applied. That is, the degree of the reduction in the rotational speed due to the deterioration of the engine is determined by the degree of the dispersion of the deterioration determination criterion value of the rotational speed against the rotational speed currently recorded. In the air intake amount correction, the degree of rotation speed reduction due to degradation is corrected by a specific air intake amount value.
Thus, according to the engine emission deterioration suppressing apparatus of the present invention, by setting the engine deterioration determination criterion and performing the air intake amount correction when it is determined that the engine is deteriorated, the decrease in the engine rotation speed and the decrease in the exhaust gas temperature are avoided, and the deterioration of the engine emission is suppressed.
The operation of the engine emission deterioration suppression device according to the present invention will be described below with reference to fig. 3 to 6.
In fig. 3, after the engine emission deterioration suppressing apparatus starts to operate, the flow proceeds to step S1, where deterioration criterion setting is performed. In step S1, the actions of data recording and processing are as shown in fig. 4. In fig. 4, after the engine is started, corresponding data of the rotation speed, the exhaust gas temperature, and the ignition advance angle in 0 to 10 seconds, 11 to 20 seconds, and 21 to N seconds (N is n.ltoreq.50 before the start of the closed loop feedback control) are recorded according to three sections of the water temperature at the time of the start-up, 10 to 20 ℃ and 20 to 30 ℃ and 30 to 40 ℃, the data are repeatedly recorded N times, and the average processing is performed to obtain maps 1 to 9, thereby obtaining the degradation determination standard value of the rotation speed, the degradation determination standard value of the exhaust gas temperature, and the degradation determination standard value of the ignition advance angle in table 2.
Then, the process proceeds to step S2, and it is determined whether the engine is in the open loop control state, and if no (N), the process proceeds to step S4, and the present degradation determination is exited, and the process is terminated. If yes, the process proceeds to step S3, where the mileage determination is performed.
In step S3, it is determined whether or not the vehicle mileage exceeds a predetermined value (for example, 3500 KM to 4000 KM), and if yes (Y) is determined, the process proceeds to step S5, and if no (N) is determined, the process is terminated.
In step S5, the degradation determination flow shown in fig. 5 is entered. The degradation determination criterion values corresponding to table 2 are called, and in steps S51 to S53, ignition advance angle comparison, exhaust gas temperature comparison, and rotation speed comparison are performed by using the above-described formulas (1) to (3), respectively, and when three determination conditions are simultaneously satisfied, it is determined that the engine is degraded. The order of steps S51 to S53 may be arbitrarily changed. In fig. 5, when the above degradation determination is established a predetermined number of times (for example, 5 times) (yes in step S54), it is determined that the engine is degraded (step S55), and the routine proceeds to step S6, otherwise the process is terminated.
Then, the correction amount of the air intake amount is calculated in step S6 using the above formula (4).
Next, the flow advances to step S7, where the additional air amount is executed. Specifically, as shown in fig. 6, in step S71, the additional gas amount processing is started. In step S72, it is determined whether or not the ignition timing is finished, and when it is determined that "yes" (Y), the routine proceeds to step S73, and the air intake amount is corrected by the correction amount calculated in step S6, otherwise the process is ended. After step S7 is completed, the entire process is ended.
Next, a hardware configuration of the engine control device 2 to which the engine emission degradation suppression device 1 is applied will be described with reference to fig. 7.
The engine control device 2 includes a water temperature sensor 21, a rotation speed sensor 22, a vehicle speed sensor 23, a knock sensor 24, an exhaust gas temperature sensor 25, a camshaft position sensor 26, a crankshaft position sensor 27, a throttle sensor 28, a throttle position adjustment motor 29, and an ECU (electronic control unit) 30.
The water temperature sensor 21 is used to acquire the water temperature at the time of cold start of the engine. The rotation speed sensor 22 is used to acquire the rotation speed of the engine. The vehicle speed sensor 23 is used to acquire the vehicle speed of the vehicle. The signal output from the knock sensor 24 is used by the ECU30 to determine whether the engine knocks, thereby correcting the ignition advance angle and realizing closed-loop control of the ignition advance angle. The exhaust gas temperature sensor 25 is used to acquire the exhaust gas temperature of the engine. The camshaft position sensor 26 outputs a camshaft position signal for the ECU30 to recognize cylinder compression top dead center, thereby performing ignition timing control and knock control. The crank position sensor 27 outputs a crank position signal for calculation of the ignition advance angle and control of the ignition timing. The throttle sensor 28 is used to detect the position of the throttle valve. The ECU30 outputs a control signal, adjusts the position of the throttle valve by the throttle position adjusting motor 29, and corrects the amount of air intake.
The engine emission deterioration suppression device 1 may be constituted in the ECU 30. Specifically, the functions of the respective elements of the engine emission deterioration suppression device 1 may be realized by dedicated hardware, or may be realized by a processor (CPU (Central Processing Unit: central processing unit), central processing unit, arithmetic unit, microprocessor, microcomputer, DSP (Digital Signal Processor: digital signal processor)) that executes a program stored in a memory. In the case of being implemented by a processor, the functions of the respective elements of the engine emission deterioration suppressing apparatus 1 are implemented by software or the like (software, firmware, or a combination of software and firmware). The software is recorded as a program and stored in the memory. The programs stored in the memories are read and executed by the processors, thereby realizing the functions of the respective parts. Here, the Memory includes all storage media such as a nonvolatile or volatile semiconductor Memory such as a RAM (Random Access Memory: random access Memory), a ROM (Read Only Memory), a flash Memory, an EPROM (Erasable Programmable Read Only Memory: erasable programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory: electrically erasable programmable Read Only Memory), an HDD (Hard Disk Drive), a magnetic Disk, a floppy Disk, an optical Disk, a compact disc, a mini optical Disk, a DVD (Digital Versatile Disk: digital versatile Disk), and a Drive device thereof.
The present invention has been described in detail, but the above embodiments are merely examples of all embodiments, and the present invention is not limited thereto. The present invention can freely combine the embodiments, change any component of the embodiments, or omit any component of the embodiments within the scope of the present invention.
Claims (21)
1. An engine emission deterioration suppression device, characterized by comprising:
a deterioration criterion setting unit that sets a deterioration criterion value of an engine based on an ignition advance angle, an exhaust gas temperature, and a rotation speed recorded at a normal wear period of the engine;
a deterioration determination unit that compares a currently acquired ignition advance angle, exhaust gas temperature, and rotation speed with the deterioration determination criterion value set by the deterioration criterion setting unit, and determines that the engine is deteriorated when a predetermined determination condition is satisfied; a kind of electronic device with high-pressure air-conditioning system
An air intake amount correction unit that calculates a correction amount of the air intake amount when the degradation determination unit determines that the engine is degraded, and corrects the air intake amount by using the correction amount,
the air intake amount correction unit calculates the correction amount based on the degree of dispersion of the currently recorded rotation speed with respect to the degradation determination criterion value of the rotation speed.
2. The engine-out deterioration suppressing apparatus according to claim 1, characterized in that,
the deterioration determination unit determines whether the engine is deteriorated after the vehicle mileage exceeds a predetermined value.
3. The engine-out deterioration suppressing apparatus according to claim 1, characterized in that,
the degradation criterion setting means records an ignition advance angle, an exhaust gas temperature, and a rotational speed within a predetermined time after the engine is started.
4. The engine-out deterioration suppressing apparatus according to claim 3, characterized in that,
the deterioration criterion setting means repeatedly records the ignition advance angle, the exhaust gas temperature, and the rotation speed a prescribed number of times during the normal wear period of the engine, and calculates an average value as the deterioration criterion value.
5. The engine-out deterioration suppressing apparatus according to claim 4, characterized in that,
the degradation criterion setting means deletes the current recording value and exits the current recording operation when the change of the demanded intake air amount is equal to or greater than a predetermined value or when the sensor for acquiring the recording values of the ignition advance angle, the exhaust temperature, and the rotation speed has no feedback or feedback error signal.
6. The engine-out deterioration suppressing apparatus according to claim 1, characterized in that,
the deterioration determination means determines that the engine is deteriorated when it is determined that the predetermined determination condition is satisfied a predetermined number of times in succession.
7. The engine-out deterioration suppressing apparatus according to claim 1, characterized in that,
the deterioration determination means sets a sensitivity for performing spark advance angle comparison, a sensitivity for performing exhaust gas temperature comparison, and a sensitivity for performing rotational speed comparison in the predetermined determination conditions.
8. The engine-out deterioration suppressing apparatus according to claim 7, characterized in that,
the sensitivity for performing the ignition advance angle comparison is in the range of 0 to 12.
9. The engine-out deterioration suppressing apparatus according to claim 7, characterized in that,
the sensitivity for performing the exhaust gas temperature comparison is in the range of 0 to 1.
10. The engine-out deterioration suppressing apparatus according to claim 7, characterized in that,
the value range of the sensitivity for rotating speed comparison is 0.6-1.
11. An engine emission deterioration suppressing method, characterized by comprising the steps of:
a deterioration criterion setting step of setting a deterioration criterion value of an engine based on an ignition advance angle, an exhaust gas temperature, and a rotation speed recorded at a normal wear period of the engine;
a degradation determination step of comparing the currently acquired ignition advance angle, exhaust gas temperature, and rotation speed with the degradation determination criterion value set in the degradation criterion setting step, and determining that the engine is degraded when a predetermined determination condition is satisfied; a kind of electronic device with high-pressure air-conditioning system
An air intake amount correction step of calculating a correction amount of the air intake amount when the degradation determination step determines that the engine is degraded, and correcting the air intake amount by using the correction amount,
in the air intake amount correction step, the correction amount is calculated based on the degree of dispersion of the currently recorded rotation speed with respect to the degradation determination criterion value of the rotation speed.
12. The engine-out deterioration suppressing method according to claim 11, characterized in that,
in the degradation determination step, it is determined whether the engine is degraded after the vehicle mileage exceeds a predetermined value.
13. The engine-out deterioration suppressing method according to claim 11, characterized in that,
in the degradation criterion setting step, an ignition advance angle, an exhaust gas temperature, and a rotational speed are recorded in a predetermined time after the engine is started.
14. The engine-out deterioration suppressing method according to claim 13, characterized in that,
in the degradation criterion setting step, the ignition advance angle, the exhaust gas temperature, and the rotation speed are repeatedly recorded a predetermined number of times during a normal wear period of the engine, and an average value is obtained as the degradation criterion value.
15. The engine-out deterioration suppressing method according to claim 14, characterized in that,
in the degradation criterion setting step, when the change of the demanded intake air amount is equal to or larger than a predetermined value or when the sensor for acquiring the recorded values of the ignition advance angle, the exhaust temperature, and the rotation speed has no feedback or feedback error signal, the recorded value of the present time is deleted, and the present recording operation is exited.
16. The engine-out deterioration suppressing method according to claim 11, characterized in that,
in the degradation determination step, the engine is determined to be degraded when it is determined that the predetermined determination condition is satisfied a predetermined number of times in succession.
17. The engine-out deterioration suppressing method according to claim 11, characterized in that,
in the degradation determination step, a sensitivity for performing ignition timing comparison, a sensitivity for performing exhaust gas temperature comparison, and a sensitivity for performing rotational speed comparison are set in the predetermined determination conditions.
18. The engine-out deterioration suppressing method according to claim 17, characterized in that,
the sensitivity for performing the ignition advance angle comparison is in the range of 0 to 12.
19. The engine-out deterioration suppressing method according to claim 17, characterized in that,
the sensitivity for performing the exhaust gas temperature comparison is in the range of 0 to 1.
20. The engine-out deterioration suppressing method according to claim 17, characterized in that,
the value range of the sensitivity for rotating speed comparison is 0.6-1.
21. A storage medium, characterized in that,
the storage medium stores a program that causes a computer to execute the engine emission deterioration suppression method according to any one of claims 11 to 20.
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