CN104185730A - Control apparatus for internal combustion engine - Google Patents
Control apparatus for internal combustion engine Download PDFInfo
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- CN104185730A CN104185730A CN201380014941.4A CN201380014941A CN104185730A CN 104185730 A CN104185730 A CN 104185730A CN 201380014941 A CN201380014941 A CN 201380014941A CN 104185730 A CN104185730 A CN 104185730A
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- combustion engine
- fuel
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 44
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000008859 change Effects 0.000 claims abstract description 21
- 239000002826 coolant Substances 0.000 claims abstract description 18
- 239000000446 fuel Substances 0.000 claims description 85
- 230000006835 compression Effects 0.000 claims description 24
- 238000007906 compression Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 19
- 230000000452 restraining effect Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 description 13
- 238000013507 mapping Methods 0.000 description 8
- 101800004706 Somatostatin-22 Proteins 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000002269 spontaneous effect Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000005474 detonation Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000001915 proofreading effect Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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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
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
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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
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
-
- 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
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0611—Fuel type, fuel composition or fuel quality
- F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
Abstract
An ECU (20), after the cranking is started, performs a control such that the first combustion cycle is executed on a CPS-equipped cylinder (step 100). After that, self-ignition occurs in the first combustion cycle, and the in-cylinder pressure changes. The ECU (20) detects change of the in-cylinder pressure by using a cylinder pressure sensor (22), and acquires the maximum value thereof as a value Pmax (step 102). Next, the acquired value Pmax is corrected on the basis of the engine coolant temperature or the amount of in-cylinder air (step 104). The ECU (20) pre-stores the relationship between the value Pmax and the octane number (RON) as a map. The ECU (20) determines the octane number (RON) that corresponds to the value Pmax, from the map (step 106).
Description
Technical field
The present invention relates to the control apparatus of internal-combustion engine, more particularly, relate to the control apparatus of the spark ignition type internal-combustion engine with cylinder pressure sensors.
Background technique
Japanese Patent Application Publication No.2009-74515 (JP 2009-74515 A) discloses a kind of control apparatus of internal-combustion engine, and in the time piloting engine, it can determine the characteristic of fuel.In the time starting this motor, this control apparatus forms motor and will not start a small amount of air-fuel mixture of spontaneous running, and then, the ignition timing after compression top center, makes this mixture ignition, to burn by spark.About this burning, control apparatus calculates the heat of the fuel generation of per unit mass, and on the basis of calculated heat generation amount, determines the characteristic of fuel.
But, the good accuracy during in order to ensure definite fuel characteristic, the heat that the fuel that requires control apparatus to calculate exactly per unit mass produces.But, above-mentioned control apparatus be designed to calculate when motor by do not start spontaneous running a small amount of fuel combustion time the heat that produces.Therefore, can suppose that control apparatus can not calculate the heat being produced by the burning of fuel exactly in the time that the temperature/pressure that caused by compression rises impact relatively large, therefore, the precision while determining the characteristic of fuel may decline.
Summary of the invention
The invention provides the control apparatus of spark ignition type internal-combustion engine, it can determine the characteristic of the fuel being used by internal-combustion engine at present exactly.
A first aspect of the present invention is a kind of control apparatus for spark ignition type internal-combustion engine, and this control apparatus comprises: inner pressure of air cylinder detection device, for detection of the inner pressure of air cylinder of one or more cylinders of internal-combustion engine; And fuel characteristic determining device, during being used for carrying out for the first time the first burn cycle of spark ignition after internal-combustion engine starts to start, by using inner pressure of air cylinder detection device, detect at the inner pressure of air cylinder that starts to be caused by self ignition after compression stroke and before execution spark ignition and change, and for changing based on inner pressure of air cylinder, determine the fuel characteristic of the fuel being used by internal-combustion engine.
According to a first aspect of the invention, carry out for the first time the first burn cycle of spark ignition after the startup that starts motor during, control apparatus detects from starting compression stroke and changes to carrying out the inner pressure of air cylinder being caused by self ignition during the time period of spark ignition.The inner pressure of air cylinder variation being caused by self ignition has associated with fuel characteristic.Therefore,, according to the present invention, become and can, before cranking internal combustion engine, on the basis changing at detected inner pressure of air cylinder, determine fuel characteristic.
In above-mentioned structure, fuel characteristic determining device can comprise the peaked device changing for obtaining inner pressure of air cylinder, and can determine based on maximum value the fuel characteristic of the fuel being used by internal-combustion engine.
According to above-mentioned structure, during the first burn cycle after the startup that starts motor, detect by inner pressure of air cylinder detection device the inner pressure of air cylinder being caused by self ignition and change, then, obtain the maximum value (maximum inner pressure of air cylinder) that inner pressure of air cylinder changes.Maximum inner pressure of air cylinder has associated with fuel characteristic.Therefore, become and can, before cranking internal combustion engine, on the basis of obtained maximum inner pressure of air cylinder, determine fuel characteristic.
In addition, in above-mentioned structure, fuel characteristic determining device can comprise the device of the rate of change for obtaining inner pressure of air cylinder variation, and can determine based on rate of change the fuel characteristic of the fuel being used by internal-combustion engine.The rate of change that inner pressure of air cylinder changes can be the inner pressure of air cylinder variable quantity (Δ P/ Δ CA °) of per unit crank angle.
In addition, according to above-mentioned structure, start start after carry out for the first time the first burn cycle of spark ignition during, detect by inner pressure of air cylinder detection device the inner pressure of air cylinder being caused by self ignition and change, then, obtain rate of change (inner pressure of air cylinder rate of change).Inner pressure of air cylinder rate of change and fuel characteristic are relevant.Therefore, become and can, before cranking internal combustion engine, on the basis of obtained inner pressure of air cylinder rate of change, determine fuel characteristic.
In addition, in above-mentioned structure, inner pressure of air cylinder detection device can be the cylinder pressure sensors of installing for the specific cylinder of a cylinder as in one or more cylinders, and control apparatus may further include cylinder selection device, for carry out the first burn cycle on specific cylinder.
In addition, according to above-mentioned structure, specific cylinder is equipped with cylinder pressure sensors, and carries out cylinder and select, and makes to carry out the first burn cycle on specific cylinder.Therefore, the inner pressure of air cylinder that can detect in the first burn cycle changes, and does not need to arrange multiple cylinder pressure sensors.
In addition, in above-mentioned structure, control apparatus may further include control gear, for carrying out the control for increasing the compression ratio of the first burn cycle.Can be the control that increases the aperture of closure for carrying out for increasing the control of the compression ratio of the first burn cycle, or postpone to be closed by Variable Valve Time gear the timing retard control of closing timing of intake valve.
According to above-mentioned structure, carry out the control for increasing the compression ratio in the first burn cycle.Therefore, can realize the condition that self ignition probably occurs in the first burn cycle, make to become the precision that can effectively increase while determining fuel characteristic.
In addition, in above-mentioned structure, control apparatus may further include correcting device, for by using air quantity in the coolant temperature of internal-combustion engine or the cylinder of internal-combustion engine, proofreaies and correct the inner pressure of air cylinder being detected by inner pressure of air cylinder detection device and changes.
According to above-mentioned structure, by using in air quantity in coolant temperature and cylinder, proofread and correct the inner pressure of air cylinder detecting to change.Inner pressure of air cylinder when self ignition depends on air quantity in coolant temperature and cylinder and changes.Therefore, the inner pressure of air cylinder that becomes the aforesaid operations condition that depends on that can obtain by correction changes, and effectively increases the precision while determining fuel characteristic.
In above-mentioned structure, fuel characteristic determining device can be determined the octane value of the fuel being used by internal-combustion engine.
According to above-mentioned structure, on the basis changing at obtained inner pressure of air cylinder, determine the octane value of fuel.Therefore,, before cranking internal combustion engine, can effectively determine the octane value of fuel.
In addition, in above-mentioned structure, control apparatus may further include pinking restraining device, if for the octane value determined by fuel characteristic determining device lower than pre-determined reference value, carry out the control of the generation for suppressing pinking.
According to above-mentioned structure, if determined octane value, lower than predetermined standard value, is carried out the control of the generation for suppressing pinking.Therefore, can effectively suppress the generation of pinking.
In addition,, in above-mentioned structure, pinking restraining device can comprise the device for the output of limit engine.
According to above-mentioned structure, if determined octane value lower than predetermined standard value, the output of limit engine.Therefore, can effectively avoid the generation of pinking.
In addition,, in above-mentioned structure, pinking restraining device can comprise the warning device for user being produced to warning.
According to above-mentioned structure, if determined octane value, lower than predetermined standard value, produces the warning to user.Therefore, low-octane problem of fuel etc. can be informed to user effectively, therefore, can avoid the generation of pinking.
A second aspect of the present invention is a kind of controlling method for spark ignition type internal-combustion engine, the method comprising the steps of: carry out for the first time the first burn cycle of spark ignition after internal-combustion engine starts to start during, based on changing at the inner pressure of air cylinder that starts to be caused by self ignition, determine the fuel characteristic of the fuel being used by internal-combustion engine after compression stroke and before execution spark ignition.
According to second aspect, carry out for the first time the first burn cycle of spark ignition after the startup that starts motor during, from starting compression stroke to carrying out the basis of the inner pressure of air cylinder variation being caused by self ignition during the time period of spark ignition, determine the fuel characteristic of fuel.The inner pressure of air cylinder variation being caused by self ignition has associated with fuel characteristic.Therefore, become and can before cranking internal combustion engine, determine fuel characteristic.
Brief description of the drawings
Hereinafter, with reference to accompanying drawing, feature, advantage and technology and the industrial significance of exemplary embodiment of the present invention described, wherein, the element that identical numeral is identical, and wherein:
Fig. 1 is the figure of the System Construction for describing the first embodiment of the present invention;
Fig. 2 is while being illustrated in engine start, is equipped with the inner pressure of air cylinder of cylinder and the sequential chart of engine speed of cylinder pressure sensors;
Fig. 3 is illustrated under scheduled operation condition, the figure of the relation between maximum value Pmax and octane value (RON) that inner pressure of air cylinder changes;
Fig. 4 A illustrates the figure of maximum value Pmax with respect to the variation tendency of air quantity in cylinder;
Fig. 4 B illustrates the figure of maximum value Pmax with respect to the variation tendency of engine coolant;
Fig. 5 is the flow chart of the routine carried out in the first embodiment of the present invention; And
Fig. 6 is the flow chart of the routine carried out in the second embodiment of the present invention.
Embodiment
Hereinafter, with reference to accompanying drawing, embodiments of the invention are described.In figure, identical or comparing element is represented by identical reference symbol, hereinafter, will no longer repeatedly describe.Also note that following specification will not limit the present invention.
The first embodiment
[the first embodiment's structure]
Fig. 1 is the figure of the System Construction for describing the first embodiment of the present invention.As shown in Figure 1, system according to the present invention comprises internal-combustion engine (motor) 10.Motor 10 is the spark ignition type internal-combustion engines that are equipped with pressurized machine.The structure of pressurized machine is disclosed in many documents, therefore, not shown in the drawings.Exhaust passage 16 is communicated with the exhaust side of motor 10.In exhaust passage 16, be provided for removing from waste gas the toxic emission control catalyzer 18 of pollutant.Toxic emission control catalyzer 18 can be the known catalysts such as three-way catalyst etc.
This embodiment's system also comprises for storing from the fuel tank 12 of the Fuel Petroleum of outside supply.One end of fuel channel 14 is connected to fuel tank 12.The other end of fuel channel 14 is connected to the fuel system of motor 10.In addition, one in the cylinder of motor 10 is equipped with cylinder pressure sensors (hereinafter, also referred to as " CPS ") 22, for detection of the inner pressure of air cylinder of this cylinder.Be equipped with the cylinder of CPS 22 to be called in " cylinder that is equipped with CPS ".
The system of the present embodiment comprises ECU (electronic control unit) 20 as shown in Figure 1.The input part of ECU20 is not only connected to above-mentioned CPS 22, and be connected to for detection of the CKP of the rotational position of bent axle, for detection of the cooling-water temperature transmitter of the temperature of engine coolant, and detect the detonation sensor of the generation of the pinking of motor 10.The carry-out part of ECU 20 is connected to the various actuators of closure, spark plug and Fuelinjection nozzle.ECU 20 on the basis of various information that is input to ECU 20, the serviceability of control engine 10.
[the first embodiment's operation]
(about engine start time self ignition phenomenon)
Then,, with reference to Fig. 2 to Fig. 4 B, embodiment's operation is described.In spark ignition type internal-combustion engine 10, between 10 the starting period of piloting engine, in the first burn cycle, there is sometimes self ignition, the wherein air/fuel mixture spontaneous ignition in cylinder.To be described more specifically this self ignition phenomenon.For example, because the startup being driven by starter motor is the low speed rotation (, 260rpm) of motor, the mixture in cylinder during the first burn cycle will be compressed very slowly.Then, in cylinder, oxidation reaction is carried out during the compression stroke of long-time section, and near mixture fuel in spontaneous ignition and cylinder compression top center (TDC) is burnt immediately.
Fig. 2 is the sequential chart of the variation of the engine speed while being equipped with the inner pressure of air cylinder of cylinder of cylinder pressure sensors and engine start.Example example shown in this Fig is between the starting period of motor 10, and in the first burn cycle, how self ignition occurs.As mentioned above, in self ignition, the fuel in cylinder burns immediately, different from the normal combustion of following flame propagation to occur.Therefore, as shown in Figure 2, in the time that self ignition occurs, demonstrate the waveform that inner pressure of air cylinder sharply rises.Increase after engine speed in the first burning, the endurance of compression stroke shortens, and therefore, burning normally occurs, and there is no self ignition.
As mentioned above, by the increase degree of inner pressure of air cylinder, the burning starting by the burning being started by self ignition with by igniting is distinguished from each other, can also be otherwise, and for example, crank angle while burning generation by use is distinguished., conventionally the ignition timing in the first burn cycle is set in to ATDC timing (atdc timing), and self ignition occurs near TDC.Therefore, the crank angle while burning generation by detection, can be easy to carry out this differentiation.
(about the relation between self ignition and octane value)
As mentioned above, if use low ron fuel, in the first burn cycle of motor 10, occur because the inner pressure of air cylinder of self ignition changes.Relation between the octane value (RON) of the inventor of present patent application to the inner pressure of air cylinder due to self ignition and fuel has been carried out strong research and investigation.As a result, inventor has been found that between the octane value (RON) of the maximum value Pmax that changes due to the inner pressure of air cylinder of self ignition and used fuel and exists some associated.Fig. 3 is illustrated under preset engine operational condition, the figure of the relation between maximum value Pmax and octane value (RON) that inner pressure of air cylinder changes.As shown in the figure, octane value is lower, and Pmax is higher for value.
Therefore,, in the system of the present embodiment, utilize the relation shown in Fig. 3 to determine the octane value of used fuel (RON).Particularly, the relation being worth between Pmax and octane value (RON) is stored as to mapping in advance in ECU 20, and determines the octane value (RON) corresponding to obtained value Pmax by this mapping.It should be noted that, octane value (RON) is not only depended in the variation of value Pmax, and depends on other engine operating conditions, such as air quantity in cylinder (compression ratio), engine coolant temperature etc.Fig. 4 A shows the trend of maximum value Pmax with respect to the variation of air in cylinder.Fig. 4 B shows the trend of maximum value Pmax with respect to the variation of coolant temperature.As shown in Fig. 4 A and 4B, maximum value Pmax demonstrate when air quantity in cylinder larger, or in the time that coolant temperature is higher larger trend.Therefore, embodiment's system is carried out the correction to obtained maximum value Pmax, and it has reflected the impact of the interior air quantity of cylinder and coolant temperature.Then, determine the octane value (RON) corresponding to value Pmax after proofreading and correct by this mapping.Hereinafter, with reference to flow chart, describe the detailed process of the octane value of definite used fuel in detail.
[detailed process in the first embodiment]
Fig. 5 is the flow chart that ECU 20 carries out the routine of the process of the octane value (RON) of determining the fuel using.As shown at this flow chart, starting after startup, first ECU 20 carries out the control (step 100) of carrying out the first burn cycle in the cylinder that is equipped with CPS.About the method for this control, for example, after the cylinder by starting is determined, spray enough by being equipped with the cylinder of CPS to start fuel.Then,, during the first burn cycle, follow inner pressure of air cylinder to change self ignition occurs.ECU 20 changes by using cylinder pressure sensors 22 to detect inner pressure of air cylinder, and its maximum value is obtained as value Pmax (step 102).Then,, on the basis of ECU 20 air quantity in coolant temperature and cylinder, proofread and correct the value Pmax (step 104) obtaining.ECU 20 is with the relation between the form value of being pre-stored in Pmax and the octane value (RON) of mapping.ECU 20 determines the octane value (RON) (step 106) corresponding to obtained value Pmax clearly from this mapping.
As mentioned above, according to the system of the present embodiment, by utilizing the inner pressure of air cylinder being caused by self ignition during the first burn cycle when the engine start to change, can determine the octane value (RON) of the fuel using.Therefore, become and can, by using existing system structure, determine the octane value (RON) of the fuel using, and not need to install individually sensor for detection of fuel characteristic etc.In addition, due to before exploding completely, detect the octane value (RON) of the fuel using, become and can, after piloting engine, carry out and the corresponding various control of octane value (RON) immediately.
Although in above-mentioned the first embodiment, while not specifically being limited in engine start, for the operational condition of the first burn cycle, by establishing the operational condition that self ignition may occur, can increase the precision of the characteristic of determining fuel.More particularly, compression ratio is higher, and the self ignition in the first fuel cycle more may occur.Therefore,, by increasing air quantity in the cylinder in the first burn cycle, can effectively increase compression and recently realize the condition that is conducive to self ignition.By the way, the example of may expecting for increasing the method for air quantity in cylinder comprises the method for the aperture that increases closure, and being equipped with in the system of electronic variable valve timing mechanism (electronics VVT), the method for closing timing of retarded admission door (IVC).In addition, variable compression ratio (VCR) motor can be increased to compression ratio as motor 10.
In addition, the operational condition of the first burn cycle during about engine start, engine coolant temperature is higher, and the self ignition of the first burn cycle more may occur.Therefore, if the coolant temperature being detected by cooling-water temperature transmitter lower than pre-determined reference value, can limit determining about fuel characteristic.This will make in the situation that there is not self ignition, and limit erroneous is determined effectively.
In addition, although in above-mentioned the first embodiment, by air quantity in cylinder and coolant temperature, proofread and correct the maximum value Pmax being detected by CPS (cylinder pressure sensors) 22, make fuel characteristic determine in reflect these operational conditions, the method is not restrictive.; by for each of operational condition (Factors); such as air quantity, coolant temperature etc. in cylinder; respectively prestor octane value (RON) corresponding to the mapping of maximum value Pmax; then select to shine upon accordingly with current operation condition, can carry out the determining of fuel characteristic of mirror operation condition.In addition, be not limited to air quantity and coolant temperature in cylinder with proofreading and correct the relevant operational condition factor, but can, by other operational condition factors, be further used as and proofread and correct the relevant operational condition factor such as fuel injection amount, barometric pressure etc.
In addition, although in the present embodiment, one in cylinder is equipped with CPS 22, and two or more cylinders can be equipped with CPS 22.In this case, the first burn cycle is occurred in in the cylinder that is equipped with CPS just enough.
In addition, although in the first embodiment, utilize maximum value (Pmax) that inner pressure of air cylinder that the self ignition in the first burn cycle causes changes to determine the octane value (RON) of used fuel, can be used for the index that definite inner pressure of air cylinder changes and be not limited to the maximum value that inner pressure of air cylinder changes.That is, because self ignition is the phenomenon of synchronizeing with crank angle, Pmax is larger for value, and the inner pressure of air cylinder rate of change that reaches maximum value Pmax must become larger.Therefore, the rate of change changing as inner pressure of air cylinder, for example, obtain the inner pressure of air cylinder variable quantity (Δ P/ Δ CA °) of per unit crank angle, and can determine with inner pressure of air cylinder variable quantity the octane value (RON) of used fuel.
By the way,, in the first embodiment, CPS 22 is corresponding to inner pressure of air cylinder detection device, and ECU 20 is by the process of execution step 102 and 106, realizes fuel characteristic determining device.
In addition, in the first embodiment, ECU 20 passes through the process implementation cylinder selection device of execution step 100, and by the process implementation correcting device of execution step 104.
The second embodiment
[the second embodiment's feature]
Then,, with reference to Fig. 6, the second embodiment of the present invention is described.Realize the second embodiment by the routine shown in execution graph 6 in the system shown in Fig. 1.
This embodiment's system comprises knock control system (being called hereinafter, " KCS ").KCS is if the appearance of pinking or its sign detected by detonation sensor, avoids the system of pinking by retarded spark timing.But the operating range of KCS is limited.That is, if by fueling, provide the fuel of octane value lower than the octane value (RON) of the operation supposition of this KCS, may can not tackle fully this situation by this KCS, and can not avoid in some cases pinking.
As mentioned above, on the basis of the maximum value Pmax that this embodiment's system can change at the inner pressure of air cylinder being caused by the self ignition in the first burn cycle, determine the octane value (RON) of the fuel using.Therefore, in the second embodiment's system, if determined octane value (RON) lower than the operating limit of KCS, the output of limit engine 10 is to avoid pinking, and produces warning to driver.The example expected of motor export-restriction comprises limp-home (limp-home) pattern or the error protection pattern carried out.The example expected of warning comprises that MIL (fault indicating lamp) lights, produces warning etc.These layouts make, by fueling, to provide in the situation of the low quality fuel that its octane value is quite low, can effectively avoid pinking.
[detailed process of carrying out in the second embodiment]
Fig. 6 is the flow chart that ECU 20 carries out the routine of the process of avoiding pinking.As shown at this flow chart, starting after startup, first ECU 20 carries out the control (step 200) of carrying out the first burn cycle in the cylinder that is equipped with CPS.After this, along with the variation of inner pressure of air cylinder, the self ignition in the first burn cycle occurs.ECU 20, by using cylinder pressure sensors 22, detects inner pressure of air cylinder and changes, and its maximum value is obtained as value Pmax (step 202).Then,, on the basis of ECU 20 air quantity in coolant temperature and cylinder, proofread and correct the value Pmax (step 204) obtaining.ECU 20 is with the relation between form pre-stored value Pmax and the octane value (RON) of mapping.ECU 20 determines the octane value (RON) (step 206) corresponding to obtained value Pmax particularly by this mapping.Carry out with step 100 to 106 identical processes to 206, ECU 20 in step 200.
Then, ECU 20 determines that whether the octane value definite in step 206 (RON) be lower than pre-determined reference value (step 208).Pre-determined reference value is the lower limit of the operating range of KCS, and is pre-stored in ECU 20, and reads from ECU 20 as required.If in step 208, octane value (RON) < reference value is false, and determines so the generation that can be avoided by KCS pinking, and this routine finishes immediately.On the other hand, if octane value (RON) < reference value is set up, determine so the generation that can not be avoided by KCS pinking, this routine proceeds to next step, wherein, the output of limit engine 10, and carry out the warning (step 210) to driver.
As mentioned above, according to the second embodiment's system, if the octane value of the fuel using (RON) lower than the operating limit of KCS, the suitably output of limit engine 10, makes effectively to avoid the generation of pinking.
In a second embodiment, CPS 22 is corresponding to " inner pressure of air cylinder detection device ", and ECU20 is by the process implementation " fuel characteristic determining device " of execution step 202 and 206.
In addition, in a second embodiment, ECU 20 passes through the process implementation " cylinder selection device " of execution step 200, and by the process implementation " correcting device " of execution step 204.
In addition, in a second embodiment, ECU 20 is by the process implementation " pinking restraining device " of execution step 208 and 210.
Claims (14)
1. for a control apparatus for spark ignition type internal-combustion engine, it is characterized in that comprising:
Inner pressure of air cylinder detection device, for detection of the inner pressure of air cylinder of one or more cylinders of described internal-combustion engine; And
Fuel characteristic determining device, during being used for carrying out for the first time the first burn cycle of spark ignition after described internal-combustion engine starts to start, by using described inner pressure of air cylinder detection device, detect at the inner pressure of air cylinder that starts to be caused by self ignition after compression stroke and before execution spark ignition and change, and for changing based on described inner pressure of air cylinder, determine the fuel characteristic of the fuel being used by described internal-combustion engine.
2. control apparatus according to claim 1, wherein,
Described fuel characteristic determining device comprises the peaked device changing for obtaining described inner pressure of air cylinder, and determines the fuel characteristic of the fuel being used by described internal-combustion engine based on maximum value.
3. control apparatus according to claim 1, wherein,
Described fuel characteristic determining device comprises the device of the rate of change for obtaining described inner pressure of air cylinder variation, and determines the fuel characteristic of the fuel being used by described internal-combustion engine based on described rate of change.
4. control apparatus according to claim 3, wherein,
The rate of change that described inner pressure of air cylinder changes is the inner pressure of air cylinder variable quantity of per unit crank angle.
5. according to the control apparatus described in any one in claim 1 to 4, wherein,
Described inner pressure of air cylinder detection device is the cylinder pressure sensors (22) of installing for specific cylinder, and described specific cylinder is a cylinder in described one or more cylinder, and described control apparatus further comprises:
Cylinder selection device, for carrying out described the first burn cycle on described specific cylinder.
6. according to the control apparatus described in any one in claim 1 to 5, further comprise:
Control gear, for carrying out the control for increasing the compression ratio of described the first burn cycle.
7. control apparatus according to claim 6, wherein,
The described control gear that is used for the control of carrying out the compression ratio that increases described the first burn cycle increases the aperture of closure, to increase the compression ratio in described the first burn cycle.
8. control apparatus according to claim 6, wherein,
For carrying out the described control gear late release timing of control of the compression ratio that increases described the first burn cycle, to increase the compression ratio in described the first burn cycle, close timing and close intake valve by Variable Valve Time gear described.
9. according to the control apparatus described in any one in claim 1 to 8, further comprise:
Correcting device, for by using air quantity in the coolant temperature of described internal-combustion engine or the cylinder of described internal-combustion engine, proofreaies and correct the inner pressure of air cylinder being detected by described inner pressure of air cylinder detection device and changes.
10. according to the control apparatus described in any one in claim 1 to 9, wherein:
Described fuel characteristic determining device is determined the octane value of the fuel being used by described internal-combustion engine.
11. control apparatuss according to claim 10, further comprise:
Pinking restraining device, if for by the definite octane value of described fuel characteristic determining device lower than pre-determined reference value, carry out the control of the generation for suppressing pinking.
12. control apparatuss according to claim 11, wherein,
Described pinking restraining device comprises the device of the output for limiting described internal-combustion engine.
13. according to the control apparatus described in claim 11 or 12, wherein,
Described pinking restraining device comprises the warning device for user being produced to warning.
14. 1 kinds of controlling methods for spark ignition type internal-combustion engine, is characterized in that comprising the following steps:
Carry out for the first time the first burn cycle of spark ignition after described internal-combustion engine starts to start during, based on changing at the inner pressure of air cylinder that starts to be caused by self ignition, determine the fuel characteristic of the fuel being used by described internal-combustion engine after compression stroke and before execution spark ignition.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-087645 | 2012-04-06 | ||
| JP2012087645A JP5949075B2 (en) | 2012-04-06 | 2012-04-06 | Control device for internal combustion engine |
| PCT/IB2013/000718 WO2013150373A1 (en) | 2012-04-06 | 2013-04-03 | Control apparatus for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104185730A true CN104185730A (en) | 2014-12-03 |
Family
ID=48190545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380014941.4A Pending CN104185730A (en) | 2012-04-06 | 2013-04-03 | Control apparatus for internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5949075B2 (en) |
| CN (1) | CN104185730A (en) |
| IN (1) | IN2014DN08331A (en) |
| RU (1) | RU2583325C1 (en) |
| WO (1) | WO2013150373A1 (en) |
Cited By (2)
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| CN104763542A (en) * | 2015-01-27 | 2015-07-08 | 长城汽车股份有限公司 | Hybrid fuel engine control method, control system, and vehicle |
| CN110872984A (en) * | 2018-09-03 | 2020-03-10 | 马自达汽车株式会社 | Fault diagnosis device for cylinder pressure sensor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7347171B2 (en) * | 2019-12-02 | 2023-09-20 | マツダ株式会社 | engine control device |
| JP7259725B2 (en) * | 2019-12-11 | 2023-04-18 | マツダ株式会社 | engine controller |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2013150373A8 (en) | 2014-11-20 |
| JP2013217263A (en) | 2013-10-24 |
| RU2583325C1 (en) | 2016-05-10 |
| JP5949075B2 (en) | 2016-07-06 |
| IN2014DN08331A (en) | 2015-05-15 |
| WO2013150373A1 (en) | 2013-10-10 |
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