CN113309622A - Engine emission deterioration suppression device and engine emission deterioration suppression method - Google Patents

Engine emission deterioration suppression device and engine emission deterioration suppression method Download PDF

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CN113309622A
CN113309622A CN202010119320.4A CN202010119320A CN113309622A CN 113309622 A CN113309622 A CN 113309622A CN 202010119320 A CN202010119320 A CN 202010119320A CN 113309622 A CN113309622 A CN 113309622A
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engine
deterioration
rotation speed
engine emission
value
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CN113309622B (en
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姚远
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Hitachi Anstamo Automotive Systems Suzhou Co ltd
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Hitachi Anstamo Automotive Systems Suzhou Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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 invention relates to an engine emission deterioration suppressing device and an engine emission deterioration suppressing method. The engine emission deterioration suppressing device includes: a deterioration criterion setting unit that sets a deterioration determination criterion value of the engine based on an ignition timing, an exhaust temperature, and a rotation speed recorded at a normal wear period of the engine; a deterioration determination unit that compares the currently acquired ignition timing, exhaust temperature, and rotation speed with a 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 means for calculating a correction amount of the air intake amount when the deterioration determination means determines that the engine is deteriorated, and correcting the air intake amount by using the correction amount.

Description

Engine emission deterioration suppression device and engine emission deterioration suppression method
Technical Field
The present invention relates to an engine emission deterioration suppression technique, and more particularly to an engine emission deterioration suppression device and an engine emission deterioration suppression method.
Background
After a new vehicle is put into service and the running distance reaches a certain mileage, the phenomena of abrasion, dirt blockage and the like inevitably occur due to long-time operation of the engine. This may cause an error in the air intake amount of the engine.
After the engine is exploded, the engine is in an open-loop control stage and does not enter closed-loop feedback control, and the rotating speed is continuously reduced because the air inflow amount does not meet the requirement, so that the target rotating speed cannot be reached. In the existing control logic, under the condition that the air intake quantity is not changed, the engine increases the ignition advance angle to increase the engine speed.
Disclosure of Invention
Technical problem to be solved by the invention
However, the following problems arise when using existing control logic: increasing the spark advance angle results in a decrease in exhaust temperature, resulting in a slow temperature rise of the catalyst at the three-way catalyst, failing to reach the optimum operating temperature quickly, resulting in poor emissions, increased hydrocarbons, and failing to meet the requirements of the emissions 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 device and an engine emission deterioration suppressing method for suppressing deterioration of engine emission.
Technical scheme for solving technical problem
The present invention relates to an engine emission deterioration suppressing device, including: a deterioration criterion setting unit that sets a deterioration determination criterion value of the engine based on an ignition timing, an exhaust temperature, and a rotation speed recorded during a normal wear period of the engine; a deterioration determination unit that compares the currently acquired ignition timing, exhaust 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 means for calculating a correction amount of the air intake amount when the degradation determination means determines that the engine is degraded, and correcting the air intake amount by using the correction amount.
Preferably, in the engine emission deterioration suppression device, the deterioration determination unit determines whether the engine is deteriorated after a vehicle mileage exceeds a prescribed value.
Preferably, in the engine emission deterioration suppressing device, the deterioration criterion setting unit records an ignition timing, an exhaust gas temperature, and a rotation speed within a predetermined time after the engine is started.
Preferably, in the engine emission deterioration suppression device, the deterioration criterion setting means repeatedly records an ignition timing, an exhaust temperature, and a rotation speed a predetermined number of times during a normal wear period of the engine, and calculates an average value as the deterioration determination criterion value.
Preferably, in the engine emission deterioration suppression device, the deterioration criterion setting means deletes the current record value and exits the current recording operation when a change in the required intake air amount is equal to or greater than a predetermined value or when there is no feedback or an error signal is fed back from a sensor for acquiring the record values of the ignition timing, the exhaust temperature, and the rotation speed.
Preferably, in the engine emission deterioration suppression device, the deterioration determination unit determines that the engine is deteriorated when it is determined that the predetermined determination condition is satisfied a predetermined number of consecutive times.
Preferably, in the engine emission deterioration suppression device, the deterioration determination means sets a sensitivity for performing an ignition timing comparison, a sensitivity for performing an exhaust temperature comparison, and a sensitivity for performing a rotation speed comparison in the predetermined determination condition.
Preferably, in the engine emission deterioration suppressing device, the sensitivity for performing the spark advance angle comparison has a value range of 0 to 12.
Preferably, in the engine emission deterioration suppressing device, the sensitivity for performing exhaust temperature comparison has a value in a range of 0 to 1.
Preferably, in the engine emission deterioration suppressing device, the sensitivity for performing the rotation speed comparison has a value range of 0.6 to 1.
Preferably, in the engine emission deterioration suppressing device, the air intake amount correction means calculates the correction amount based on a rotational speed dispersion at the time of starting the engine.
The present invention also relates to an engine emission deterioration suppressing method, which includes the steps of: a deterioration criterion setting step of setting a deterioration determination criterion value of the engine based on an ignition timing, an exhaust temperature, and a rotation speed recorded at a normal wear period of the engine; a degradation determination step of comparing the currently acquired ignition timing, exhaust 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 it is determined that the engine is deteriorated in the deterioration determination step, and correcting the air intake amount 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 suppressing method.
Effects of the invention
According to the engine emission deterioration suppression device and the engine emission deterioration suppression method of the present invention, the engine deterioration determination criterion is set, and the air intake amount is corrected when it is determined that the engine is deteriorated, thereby preventing a decrease in the engine speed and a decrease in the exhaust temperature, and suppressing deterioration of the engine emission.
Drawings
Fig. 1 is a block diagram showing a configuration of an engine emission deterioration suppressing device according to the present invention.
Fig. 2 is a characteristic diagram showing various parameters of the engine during a period when the engine is normally worn.
Fig. 3 is a flowchart showing the overall operation of the engine emission deterioration suppressing device according to the present invention.
Fig. 4 is a flowchart showing the operation 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 the additional air amount.
Fig. 7 is a hardware configuration diagram showing an engine control device to which the engine emission deterioration suppressing device according to the present invention is applied.
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described in more detail 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 suppression device 1 includes a deterioration criterion setting means 11, a deterioration determination means 12, and an air intake amount correction means 13.
The deterioration criterion setting means 11 sets a deterioration determination criterion value for the engine based on the ignition timing, the exhaust temperature, and the rotation speed recorded at the time of normal wear of the engine.
After the engine is assembled, the engine is mainly divided into three stages, namely a running-in abrasion stage, a normal abrasion stage and a collapse abrasion stage. In the running-in abrasion stage, the surface of a new machine body part has certain roughness, and the mating surface is abraded quickly. In the normal abrasion stage, after the break-in period, the abrasion speed is reduced, the abrasion loss is stable, and the uniform increase is kept for a long time. In the collapse wear stage, the wear limit point is reached, the oil film is broken and the machine member is about to be broken.
Fig. 2 is a characteristic diagram showing various parameters of the engine during a period when the engine is normally worn. The deterioration criterion setting means 11 records data corresponding to the ignition timing, the exhaust temperature, and the rotation speed of the engine at the time of normal wear of the engine within a predetermined time after the engine is started, and sets an engine deterioration determination criterion value.
Specifically, after the engine cooler (10 ℃ to 40 ℃) is started, the engine cooler is divided into three sections of 10 ℃ to 20 ℃, 20 ℃ to 30 ℃ and 30 ℃ to 40 ℃ according to the difference of the water temperature during the starting, corresponding data of the rotating speed, the exhaust temperature and the ignition advance angle within 0 to 10 seconds, 11 to 20 seconds and 21 to n seconds (n second is before the closed loop feedback control is started, and n is less than or equal to 50) are recorded and filled into the following table 1.
TABLE 1
Figure BDA0002392480940000041
Map 1-map 9 in Table 1 are in the form of an abbreviated form of the following chart (the data in the chart are all illustrative).
Figure BDA0002392480940000051
Further, in order to avoid errors while ensuring accuracy, it is preferable to repeatedly record data N times (e.g., N ≧ 5).
When the required intake air amount of the vehicle is greatly changed (the change of the required intake air amount is equal to or more than a predetermined value, for example, 10 liters) or when the sensors for acquiring the recorded values of the ignition timing, the exhaust temperature and the rotation speed have no feedback or feedback error signals, the recorded value at this time is deleted and the recording operation at this time is exited. Examples of the case where the required intake air amount greatly changes include shifting, switching on and off of an air conditioner, traveling, and the like, and examples of the case where the sensor does not feed back or feeds back an error signal include misfire, knocking, sensor failure, and the like.
In the case where the recording data is repeated N times, an average value is obtained as the degradation determination criterion value. Specifically, after the N-time data recording is completed, the following averaging process is performed.
1. The averaging process is performed at an intermediate value in the water temperature range (for example, 15 ℃ in the range of 10 ℃ to 20 ℃).
2. The map data in the table obtained N times is averaged (i.e., the values of the rotation speed, the exhaust temperature, and the ignition timing obtained in the same time and temperature interval are added and then divided by the number of times of recording to obtain an average value).
The following table 2 was obtained by the averaging process.
TABLE 2
Figure BDA0002392480940000061
Map1 to map9 in table 2 are all in the form of abbreviations of the following charts.
Figure BDA0002392480940000062
The ai, bi, and ci (i is 1 to n) in the above table are set as a rotation speed degradation determination criterion value, an exhaust gas temperature degradation determination criterion value, and an ignition timing degradation determination criterion value, respectively.
Next, the deterioration determination means 12 compares the currently acquired ignition timing, exhaust temperature, and rotation speed with the deterioration determination criterion value set by the deterioration criterion setting means 11, and determines that the engine is deteriorated if a predetermined determination condition is satisfied.
The deterioration determination means 12 preferably performs deterioration determination after the vehicle mileage exceeds a predetermined value (e.g., 3500 to 4000 KM). Further, the determination may be made every time the engine is cold started. Specifically, the ignition timing, the exhaust temperature, and the rotation speed within n seconds after the engine cold start (n seconds is before the closed-loop feedback control starts, n is equal to or less than 50) are recorded, and the currently acquired ignition timing, exhaust temperature, and rotation speed are compared with the degradation determination criterion value set by the degradation criterion setting unit 11.
The deterioration determination unit 12 calls the corresponding deterioration determination criterion values in table 2 according to the different water temperature sections in which the initial water temperature of the vehicle at the time of starting is located. For example, the deterioration determination criterion value (the respective deterioration determination criterion values of the rotation speed, the exhaust gas temperature, and the ignition timing advance) corresponding to the water temperature of 15 ℃ set in the deterioration setting means 11 is called when the initial water temperature is 10 to 20 ℃, the deterioration determination criterion value corresponding to the water temperature of 25 ℃ set in the deterioration setting means 11 is called when the initial water temperature is 20 to 30 ℃, and the deterioration determination criterion value corresponding to the water temperature of 35 ℃ set in the deterioration setting means 11 is called when the initial water temperature is 30 to 40 ℃.
After the corresponding degradation determination standard value in table 2 is called, the degradation determination unit 12 performs the following comparison operation.
1) Angular advance of ignition comparison
The ignition timing comparison is performed by the following formula (1).
Figure BDA0002392480940000071
Wherein, n: specified recording time(s)
θ i (i is 1 to n): the ith second ignition advance angle (deg) recorded this time
ci (i ═ 1 to n): deterioration judgment criterion value (deg) of ignition advance angle
X: sensitivity for comparing ignition advance angle (deg/s)
The value of the parameter X may be predetermined. The smaller the value of X is, the more sensitive the judgment is. The advance angle of ignition does not exceed 12 degrees, so the value range of X is preferably 0-12. Based on that the engine can carry out pre-ignition, the value range of X is further preferably 0-8.
2) Exhaust temperature comparison
The exhaust gas temperature comparison is performed by the following formula (2).
Figure BDA0002392480940000081
Wherein, n: specified recording time(s)
Ti (i ═ 1 to n): exhaust temperature (. degree. C.) at i second recorded this time
bi (i ═ 1 to n): exhaust gas temperature deterioration criterion value (. degree. C.)
Y: sensitivity for exhaust 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 will generally not exceed 850 c due to emissions regulations and exhaust pipe material considerations. Beyond this temperature, the engine may actively enrich the mixture to lower the exhaust temperature. The exhaust temperature is generally between 700 ℃ and 850 ℃ by comprehensively considering the temperature rise requirement of the catalyst. Therefore, the value range of Y is preferably 0-1.
3) Speed comparison
The rotational speed comparison is performed by the following formula (3).
Figure BDA0002392480940000082
Wherein, n: specified recording time(s)
ki (i: 21 to n): the rotation speed (rpm) of the ith second recorded this time
ai (i ═ 21 to n): deterioration determination standard 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 is, the more sensitive the judgment is. The idling speed of the vehicle is generally about 600-800 rpm, and the more the number of cylinders is, the smaller the idling speed can be. And, the lowest engine speed is generally not lower than 500rpm, and when lower than 500rpm, there is a risk of shutdown. Therefore, the preferable value range of Z is 0.6-1. Considering that when the engine speed is too low, the engine can actively increase the ignition advance angle to increase the speed, so the value range of Z is further preferably 0.8-1.
Through the above ignition timing comparison, exhaust temperature comparison, and rotation speed comparison, the deterioration determination means 12 determines that the engine is deteriorated when the three determination conditions are satisfied simultaneously.
The deterioration determination means 12 may be configured to determine that the engine is deteriorated when the above deterioration determination is established continuously a predetermined number of times (for example, 5 times).
Specifically, the engine degradation flag # ENG is set, and when the above degradation determination is continuously established a predetermined number of times (for example, 5 times), the # ENG is set to 1, and the subsequent correction of the air intake amount is performed. If the determination is not satisfied for the predetermined number of consecutive times, # ENG is set to 0, and the corrected air intake amount is called as it is.
In the case where the required intake air amount of the vehicle has changed greatly (the required intake air amount has changed by a predetermined value or more, for example, 10 liters or more) or in the case where there is no feedback or an error signal is fed back from the sensor for acquiring the recorded values of the ignition timing, the exhaust temperature, and the rotation speed, the recorded value at this time is deleted and the determination at this time is exited.
Next, when the deterioration determination means 12 determines that the engine is deteriorated, the air intake amount correction means 13 calculates a correction amount of the air intake amount, and corrects the air intake amount using the correction amount.
Specifically, when the deterioration determination is established, the correction amount (initial value 0) of the air intake amount is calculated by the following equation (4).
Correction amount ═ (1- (average of recorded rotation speeds + learning value)/target rotation speed)
Basic air intake (4)
Wherein the average of the recorded rotational speeds: average value of rotation speed after completion of explosion of engine (N times data, rotation speed within 21-N seconds) in deterioration judgment process
Figure BDA0002392480940000091
The learning value a is a degree of dispersion of the deterioration determination criterion value of the recorded rotation speed with respect to the rotation speed, and a mathematical concept of variance is applied. That is, the degree of the current decrease in the rotation speed due to the deterioration of the engine is determined by the degree of dispersion of the currently recorded rotation speed against the deterioration determination criterion value of the rotation speed. In addition, in the air intake amount correction, the specific air intake amount value is corrected for the degree of the rotation speed reduction due to the deterioration.
Thus, according to the engine emission deterioration suppression device of the present invention, the engine deterioration determination criterion is set, and the air intake amount is corrected when it is determined that the engine is deteriorated, thereby preventing a decrease in the engine speed and a decrease in the exhaust temperature, and suppressing deterioration of the engine emission.
Hereinafter, the operation of the engine emission deterioration suppressing device of the present invention will be described with reference to fig. 3 to 6.
In fig. 3, after the engine emission deterioration suppressing device starts operating, the routine proceeds to step S1 to set a deterioration criterion. In step S1, the data recording and processing act is as shown in fig. 4. In fig. 4, after the engine is cold started, the standard values of table 2 are obtained by recording the data corresponding to the rotation speed, the exhaust temperature, and the ignition lead angle in 0 to 10 seconds, 11 to 20 seconds, and 21 to N seconds (N seconds is equal to or less than 50 before the start of the closed loop feedback control) based on the three ranges of 10 to 20 ℃, 20 to 30 ℃, and 30 to 40 ℃ of the water temperature at the time of starting, repeatedly recording the data N times, and performing averaging processing to obtain maps 1 to 9.
Next, the routine proceeds to step S2 to determine whether the engine is in the open-loop control state, and if "no (N)", the routine proceeds to step S4 to exit the present deterioration determination and end the process. If yes, the process proceeds to step S3 to perform mileage determination.
In step S3, it is determined whether the vehicle mileage exceeds a predetermined value (e.g., 3500 to 4000KM), and if yes, the process proceeds to step S5 to perform deterioration determination, and if no, the process ends.
In step S5, the flow proceeds to the degradation determination flow shown in fig. 5. In steps S51 to S53, the corresponding deterioration determination criterion values in table 2 are called, and the ignition timing comparison, the exhaust gas temperature comparison, and the rotation speed comparison are performed by using the above equations (1) to (3), respectively, and when the three determination conditions are satisfied simultaneously, the engine deterioration is determined. The order of steps S51 to S53 may be changed arbitrarily. In fig. 5, when the above deterioration determination is established continuously a predetermined number of times (for example, 5 times) (yes in step S54), it is determined that the engine is deteriorated (step S55), and the process proceeds to step S6, otherwise, the process is ended.
Then, in step S6, the correction amount of the air intake amount is calculated using the above equation (4).
Subsequently, the process proceeds to step S7, where the amount of additional air is executed. Specifically, as shown in fig. 6, in step S71, the additional air amount processing is started. In step S72, it is determined whether or not the ignition timing is finished, and if it is determined "yes (Y)", the routine proceeds to step S73, where the air intake amount is corrected by the correction amount calculated in step S6, otherwise the process is finished. After completion of step S7, the entire process ends.
Next, a hardware configuration diagram of the engine control device 2 to which the engine emission deterioration suppressing 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 engine cold start. The rotational speed sensor 22 is used to acquire the rotational speed of the engine. The vehicle speed sensor 23 is used to acquire the vehicle speed of the vehicle. The ECU30 determines whether the engine knocks based on the signal output from the knock sensor 24, and corrects the ignition timing to realize closed-loop control of the ignition timing. 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 for ignition timing control and knock control. The crank position sensor 27 outputs a crank position signal for use in the calculation of the advance angle of ignition and the 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 to adjust the position of the throttle valve by the throttle position adjustment motor 29, thereby correcting the air intake amount.
The engine emission deterioration suppressing device 1 may be constituted in the ECU 30. Specifically, the functions of the elements of the engine emission degradation suppression device 1 may be realized by dedicated hardware, or may be realized by a Processor (CPU (Central Processing Unit)), a Central Processing Unit, a Processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP (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 device 1 are implemented by software or the like (software, firmware, or a combination of software and firmware). The software and the like are described as programs and stored in the memory. A program stored in the memory is read and executed by the processor, thereby realizing the functions of the respective sections. Examples of the Memory include all storage media such as a nonvolatile or volatile semiconductor Memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash Memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory), an HDD (Hard Disk Drive), a magnetic Disk, a flexible Disk, an optical Disk, a compact Disk, a mini Disk, a DVD (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 may freely combine the respective embodiments, may modify any of the components of the respective embodiments, or may omit any of the components of the respective embodiments within the scope of the present invention.

Claims (23)

1. An engine emission deterioration suppressing device characterized by comprising:
a deterioration criterion setting unit that sets a deterioration determination criterion value of the engine based on an ignition timing, an exhaust temperature, and a rotation speed recorded during a normal wear period of the engine;
a deterioration determination unit that compares the currently acquired ignition timing, exhaust 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
and an air intake amount correction means for calculating a correction amount of the air intake amount when the degradation determination means determines that the engine is degraded, and correcting the air intake amount by using the correction amount.
2. The engine emission deterioration suppressing device according to claim 1,
the deterioration determination unit determines whether the engine is deteriorated after the vehicle mileage exceeds a predetermined value.
3. The engine emission deterioration suppressing device according to claim 1,
the deterioration criterion setting unit records an ignition advance angle, an exhaust gas temperature, and a rotation speed within a predetermined time after the engine is started.
4. The engine emission deterioration suppressing device according to claim 3,
the deterioration criterion setting means repeatedly records an ignition timing, an exhaust temperature, and a rotation speed a predetermined number of times during a normal wear period of the engine, and calculates an average value as the deterioration determination criterion value.
5. The engine emission deterioration suppressing device according to claim 4,
the deterioration criterion setting means deletes the current record value and exits the current recording operation when the change in the required intake air amount is equal to or greater than a predetermined value or when there is no feedback or a feedback error signal from a sensor for acquiring the record values of the ignition timing, the exhaust temperature, and the rotation speed.
6. The engine emission deterioration suppressing device according to claim 1,
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 consecutive times.
7. The engine emission deterioration suppressing device according to claim 1,
the deterioration determination means sets a sensitivity for performing an ignition timing comparison, a sensitivity for performing an exhaust temperature comparison, and a sensitivity for performing a rotation speed comparison, in the predetermined determination condition.
8. The engine emission deterioration suppressing device according to claim 7,
the value range of the sensitivity for comparing the ignition advance angle is 0-12.
9. The engine emission deterioration suppressing device according to claim 7,
the value range of the sensitivity for exhaust temperature comparison is 0-1.
10. The engine emission deterioration suppressing device according to claim 7,
the value range of the sensitivity for carrying out rotation speed comparison is 0.6-1.
11. The engine emission deterioration suppressing device according to claim 1,
the air intake amount correction means calculates the correction amount based on a rotational speed dispersion at the time of starting the engine.
12. An engine emission deterioration suppressing method characterized by comprising the steps of:
a deterioration criterion setting step of setting a deterioration determination criterion value of the engine based on an ignition timing, an exhaust temperature, and a rotation speed recorded at a normal wear period of the engine;
a degradation determination step of comparing the currently acquired ignition timing, exhaust 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
and an air intake amount correction step of calculating a correction amount of the air intake amount when it is determined that the engine is deteriorated in the deterioration determination step, and correcting the air intake amount using the correction amount.
13. The engine emission deterioration suppressing method according to claim 12,
in the degradation determination step, it is determined whether or not the engine is degraded after the vehicle mileage exceeds a predetermined value.
14. The engine emission deterioration suppressing method according to claim 12,
in the degradation criterion setting step, an ignition timing, an exhaust gas temperature, and a rotation speed within a predetermined time after the engine is started are recorded.
15. The engine emission deterioration suppressing method according to claim 14,
in the deterioration criterion setting step, an ignition timing, an exhaust temperature, and a 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 deterioration determination criterion value.
16. The engine emission deterioration suppressing method according to claim 15,
in the degradation criterion setting step, when the change in the required intake air amount is equal to or greater than a predetermined value, or when there is no feedback or an error signal is fed back from a sensor for acquiring the recorded values of the ignition timing, the exhaust temperature, and the rotation speed, the recorded value of this time is deleted, and the recording operation of this time is exited.
17. The engine emission deterioration suppressing method according to claim 12,
in the degradation determination step, when it is determined that the predetermined determination condition is satisfied a predetermined number of consecutive times, it is determined that the engine is degraded.
18. The engine emission deterioration suppressing method according to claim 12,
in the deterioration determination step, a sensitivity for performing an ignition timing comparison, a sensitivity for performing an exhaust gas temperature comparison, and a sensitivity for performing a rotation speed comparison are set in the predetermined determination conditions.
19. The engine emission deterioration suppressing method according to claim 18,
the value range of the sensitivity for comparing the ignition advance angle is 0-12.
20. The engine emission deterioration suppressing method according to claim 18,
the value range of the sensitivity for exhaust temperature comparison is 0-1.
21. The engine emission deterioration suppressing method according to claim 18,
the value range of the sensitivity for carrying out rotation speed comparison is 0.6-1.
22. The engine emission deterioration suppressing method according to claim 1,
in the air intake amount correction step, the correction amount is calculated based on a rotational speed dispersion at the time of starting the engine.
23. A storage medium characterized in that,
the storage medium stores a program that causes a computer to execute the engine emission deterioration suppressing method according to any one of claims 12 to 22.
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