CN104179585A - Control method of multi-cylinder engine and multi-cylinder engine device - Google Patents
Control method of multi-cylinder engine and multi-cylinder engine device Download PDFInfo
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- CN104179585A CN104179585A CN201310203287.3A CN201310203287A CN104179585A CN 104179585 A CN104179585 A CN 104179585A CN 201310203287 A CN201310203287 A CN 201310203287A CN 104179585 A CN104179585 A CN 104179585A
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Abstract
The invention provides a control method of a multi-cylinder engine. The method comprises the following steps of acquiring the cylinder pressure signal of each cylinder and the corresponding engine crank shaft corner signal within a work cycle; according to the cylinder pressure signal and the crank shaft corner signal, calculating the combustion state information of each cylinder within the work cycle; within the next work cycle, based on the combustion state information of each cylinder, and aiming at the different combustion modes of the engine, adjusting the corresponding engine control parameter to balance the combustion state of each cylinder. The invention also provides a multi-cylinder engine device used for executing the method.
Description
Technical field
The present invention relates to engine control technology, and more specifically, relate to for the controlling method of multicylinder engine and the multicylinder engine device of carrying out the method.
Background technique
The Modern Vehicle Engine multicylinder engines that adopt such as four cylinders, six cylinders, eight cylinder engine more.The cylinder number of motor is more, and bent axle rotates more even, and vibration is also just less, but manufacture cost increases.The inblock cylinder of multicylinder engine is shown the forms such as array, V-arrangement and flat opposed, and this depends on the factors such as installation, manufacture cost and the type of cooling.
For the change of state of using the multicylinder engine of gasoline due to air-fuel mixture in cylinder, in difference circulation, can produce different burning results, even if difference cylinder also can show lack of uniformity under identical control parameter simultaneously.This phenomenon is all comparatively common in spark-ignition engine and compression ignition engine.The lack of uniformity of multicylinder engine can bring challenges to the control of motor, can cause the catching fire of engine section circulation, combustion efficiency reduces or the phenomenon of pinking, utilizes traditional control device to be often difficult to detect and eliminate the lack of uniformity of each cylinder.
Summary of the invention
At least one in order to address the above problem, the present invention proposes the combustion information calculating according to cylinder pressure sensor and control the method for each cylinder parameter of multicylinder engine, according to each cylinder combustion information and state, adjust in real time relevant parameter, make each cylinder working at stable and efficient state.
In one aspect of the invention, provide a kind of controlling method of multicylinder engine, described method comprises: the cylinder that gathers each cylinder in a work cycle is pressed signal and corresponding engine crankshaft corner signal; According to described cylinder, press signal and described corner signal to calculate the combustion regime information of each cylinder in described work cycle; And the described combustion regime information pointer based on each cylinder makes the combustion regime balance of each cylinder by adjusting corresponding control parameters of engine to the different combustion modes of motor in next work cycle.
According to some embodiments of the present invention, described combustion regime information comprises 50% rate of heat release angle of each cylinder, and in ignition mode in the situation that, the 50% rate of heat release angle based on each cylinder makes the combustion regime balance of each cylinder by adjusting the ignition advance angle of each cylinder at motor.
According to some embodiments of the present invention, adjust ignition advance angle and comprise the intermediate value in the 50% rate of heat release angle of determining each cylinder; And the cylinder that is greater than described intermediate value for 50% rate of heat release angle, increases its ignition advance angle; The cylinder that is less than described intermediate value for 50% rate of heat release angle, reduces its ignition advance angle.
According to some embodiments of the present invention, described combustion regime information also comprises the rate of pressure rise of each cylinder, and in ignition mode in the situation that, also the described rate of pressure rise based on each cylinder makes the combustion regime balance of each cylinder by adjusting the ignition advance angle of each cylinder at motor.
According to some embodiments of the present invention, by the rate of pressure rise of each cylinder and predetermined threshold comparison; And for the rate of pressure rise, be greater than the cylinder of predetermined threshold, reduce its ignition advance angle.
According to some embodiments of the present invention, described combustion regime information comprises the mean effective pressure of each cylinder, and at motor in homogeneous compression-ignition pattern or thin ignition mode in the situation that, described mean effective pressure based on each cylinder makes the combustion regime balance of each cylinder by adjusting the fuel injection quantity of each cylinder, the fuel injection quantity of wherein adjusting respectively each cylinder makes the mean effective pressure of each cylinder approach target mean effective pressure.
According to some embodiments of the present invention, described combustion regime information also comprises 50% rate of heat release angle of each cylinder, and at motor in homogeneous compression-ignition pattern in the situation that, also based on described 50% rate of heat release angle by adjusting the intake temperature of each cylinder or the combustion regime balance that fuel injection quantity makes each cylinder.
According to some embodiments of the present invention, determine the intermediate value in 50% rate of heat release angle of each cylinder; And for 50% rate of heat release angle, be greater than the cylinder of described intermediate value, improve its intake temperature or increase its fuel injection quantity; For 50% rate of heat release angle, be less than the cylinder of described intermediate value, reduce its intake temperature or reduce its fuel injection quantity.
According to some embodiments of the present invention, described combustion regime information also comprises the rate of pressure rise of each cylinder, and in compression-ignition mode in the situation that, also the described rate of pressure rise based on each cylinder is by adjusting the intake temperature of each cylinder or the combustion regime balance that fuel injection quantity makes each cylinder at motor.
According to some embodiments of the present invention, adjust intake temperature or fuel injection quantity and comprise: by the rate of pressure rise of each cylinder and predetermined threshold comparison; And for the rate of pressure rise, be greater than the cylinder of predetermined threshold, reduce its intake temperature or reduce its fuel injection quantity.
According to some embodiments of the present invention, described combustion regime information also comprises 50% rate of heat release angle of each cylinder, and in thin ignition mode in the situation that, also the 50% rate of heat release angle based on each cylinder is by adjust the ignition advance angle of each cylinder and the combustion regime balance that fuel injection quantity makes each cylinder simultaneously at motor.
According to some embodiments of the present invention, for the deviation of mean effective pressure and described target mean effective pressure, be greater than the cylinder of predetermined threshold, make this cylinder enter corresponding fault diagnosis and dealing state.
In another aspect of this invention, a kind of multicylinder engine device is also provided, described device comprises crankshaft sensor, cylinder pressure sensor and the engine controller corresponding with each cylinder, wherein said engine controller comprises: data acquisition unit, for gather the cylinder of engine crankshaft corner signal and each cylinder in a work cycle, press signal; State computation unit, for pressing signal and described corner signal to calculate the combustion regime information of each cylinder in described work cycle according to described cylinder; And state balance unit, for the described combustion regime information pointer based on each cylinder in next work cycle, the different combustion modes of motor are made to the combustion regime balance of each cylinder by adjusting corresponding control parameters of engine.
The present invention realizes accurate measurement and the control to in-cylinder combustion process by increasing cylinder pressure sensor.Engine controller can gather the signal of cylinder pressure sensor, it is carried out to analysis and calculation, thereby obtain the combustion regime information of each cylinder work at present circulation of motor, and according to combustion regime, adjust the control parameter of next each cylinder that circulates, with this, eliminate the lack of uniformity of each cylinder working, improve combustion efficiency and the run stability of motor.
Accompanying drawing explanation
Foregoing and other target of the present invention, feature and advantage will be according to being apparent to the more specific description of embodiments of the invention below, and these embodiments are illustrated in the accompanying drawings.
Fig. 1 shows the structure of multicylinder engine device according to an embodiment of the invention.
Fig. 2 is the flow chart of the controlling method of multicylinder engine according to an embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further describe the present invention.It should be noted that, each structure in accompanying drawing just schematically illustrates, and with so that those of ordinary skills understand principle of the present invention best, it is not necessarily drawn in proportion.
Fig. 1 shows the structure of multicylinder engine device 100 according to an embodiment of the invention.As shown in Figure 1, except necessity structure of general multicylinder engine, multicylinder engine device 100 can comprise crankshaft sensor, cylinder pressure sensor and the engine controller corresponding with each cylinder substantially.For example, for four cylinder engine, can there be four cylinder pressure sensor 1-4, corresponding with each cylinder respectively.What one skilled in the art should appreciate that is, except the part shown in Fig. 1, multicylinder engine device provided by the present invention at least possesses the basic structure of conventional multicylinder engine and at least can realize the desired fundamental function of conventional multicylinder engine, for simplicity, this does not repeat in this article.
Continuation is with reference to figure 1, engine controller in multicylinder engine device 100 can comprise according to an embodiment of the invention: data acquisition unit, state computation unit and state regulation unit, wherein the effect of unit will be described in conjunction with Fig. 2 hereinafter.
Fig. 2 is the flow chart of the controlling method of multicylinder engine according to an embodiment of the invention.In order to realize the work balance between a plurality of cylinders of motor, first in step S10, engine controller can be gathered the cylinder pressure signal of each cylinder and gather corresponding engine crankshaft corner signal from crankshaft sensor from each cylinder pressure sensor by data acquisition unit in a work cycle.In practice, can according to engine crankshaft corner signal storage, be that array is so that subsequent treatment cylinder pressure signal.In each work cycle, for single cylinder, can gather as required one or more groups cylinder and press signal and corresponding corner signal.For the many groups signal in a work cycle, can adopt the statistical means such as to be averaging and to process.
Then in step S20, engine controller can press signal and corner signal to calculate the combustion regime information of each cylinder in corresponding work cycle according to gathered cylinder by state computation unit.For instance, the combustion regime information of each cylinder can comprise 50% rate of heat release angle (CA50), the rate of pressure rise of each cylinder, the maximum in-cylinder pressure of each cylinder, the mean effective pressure of each cylinder of each cylinder etc.
Finally, in step S30, engine controller can make the combustion regime balance of each cylinder by state balance unit combustion regime information pointer based on each cylinder in next work cycle by adjusting corresponding control parameters of engine to the different combustion modes of motor.
For instance, under the ignition mode of motor, mixture combustion is mainly controlled by time of ignition, can realize according to 50% rate of heat release angle state of each cylinder the multi-cylinder balance work of motor.Therefore, state computation unit can calculate 50% rate of heat release angle (CA50) of each cylinder, i.e. each cylinder corresponding crank angle when rate of heat release reaches 50%.State regulation unit can make based on this parameter the combustion regime balance of each cylinder by adjusting the ignition advance angle of each cylinder.
According to one embodiment of present invention, first state regulation unit can determine the intermediate value of 50% rate of heat release angle of each cylinder gathering.The cylinder that is greater than this intermediate value for 50% rate of heat release angle, engine controller can increase the ignition advance angle of this cylinder, reduces thus the circular wave of motor.On the contrary, be less than the cylinder of intermediate value for 50% rate of heat release angle,, when 50% rate of heat release angle is too postponed, engine controller can reduce the ignition advance angle of this cylinder, makes 50% rate of heat release angular advance, reduces engine consumption.When 50% rate of heat release angle (CA50) is too postponed, engine controller will further increase ignition advance angle, make 50% rate of heat release angular advance, reduce engine consumption, and reduce the circular wave of motor.
Under the ignition mode of motor, the rate of pressure rise is also the important references index of engine control, if the rate of pressure rise is excessive, motor has the risk of pinking and detonation.Therefore the rate of pressure rise that, state computation unit can also calculate each cylinder is as the reference frame that regulates multi-cylinder balance.In this case, state regulation unit can also the rate of pressure rise based on each cylinder make the combustion regime balance of each cylinder by adjusting the ignition advance angle of each cylinder.For instance, state regulation unit can be by the rate of pressure rise of each cylinder and predetermined threshold comparison.For the rate of pressure rise, be greater than the cylinder of predetermined threshold, engine controller can reduce its ignition advance angle, thus the rate of pressure rise of each cylinder is all remained in certain limit value.
Under the average compression-ignition mode of motor, the burning of mixed gas during mainly by near the temperature of firing chamber determine, and the load of motor and output torque are mainly determined by fuel injection quantity.Under this pattern, can realize the multi-cylinder balance work of motor according at least one in 50% rate of heat release angle of each cylinder and mean effective pressure.Preferably, under average compression-ignition mode, can according to 50% rate of heat release angle and two parameters of mean effective pressure, to each cylinder, carry out balance control simultaneously.
On the one hand, state computation unit can calculate 50% rate of heat release angle of each cylinder, and state regulation unit can be based on 50% rate of heat release angle by adjusting the intake temperature of each cylinder or the combustion regime balance that fuel injection quantity makes each cylinder.
According to one embodiment of present invention, state regulation unit can be determined the intermediate value in 50% rate of heat release angle of each cylinder.For 50% rate of heat release angle, be greater than the cylinder of this intermediate value, engine controller can improve its intake temperature or increase its fuel injection quantity, reduces the fluctuation of each cylinder in circulation.On the contrary, be less than the cylinder of this intermediate value for 50% rate of heat release angle, when namely CA50 too postpones, engine controller can reduce its intake temperature or reduce its fuel injection quantity, reduces the fluctuation of each cylinder in circulation.
On the other hand, state computation unit can calculate the mean effective pressure of each cylinder, and state regulation unit can make based on this mean effective pressure the combustion regime balance of each cylinder by adjusting the fuel injection quantity of each cylinder.
According to one embodiment of present invention, in order to realize each cylinder balance output torque, engine controller can be according to each cylinder mean effective pressure target setting value of the motor of target, adopt and regulate the mode of fuel injection quantity to regulate each cylinder mean effective pressure calculating, the mean effective pressure of each cylinder in each circulation remained near target mean effective pressure.If certain cylinder has occurred to catch fire continuously or actual average effective pressure value and desired value sustained deviation larger, make this cylinder enter corresponding fault diagnosis and dealing state.
As previously mentioned, the rate of pressure rise is also the important references index of engine control, if the rate of pressure rise is excessive, motor has the risk of pinking and detonation.Therefore,, under compression-ignition mode, state computation unit preferably can also calculate the rate of pressure rise of each cylinder as the reference frame that regulates multi-cylinder balance.Correspondingly, the rate of pressure rise that state regulation unit can also be based on each cylinder is by adjusting the intake temperature of each cylinder or the combustion regime balance that fuel injection quantity makes each cylinder.For instance, state regulation unit can be by the rate of pressure rise of each cylinder and predetermined threshold comparison.For the rate of pressure rise, be greater than the cylinder of predetermined threshold, engine controller can reduce its intake temperature or reduce its fuel injection quantity, thus the rate of pressure rise of each cylinder is all remained in certain limit value.
Under the thin ignition mode of motor, as the transient working condition of homogeneous compression-ignition and ignition mode, the combustion regime of motor gradually changes because of the variation of air temperature.Under this pattern, can realize the multi-cylinder balance work of motor according at least one in 50% rate of heat release angle of each cylinder and mean effective pressure equally, correspondingly can regulate time of ignition and fuel injection quantity to realize the balance of each cylinder.
On the one hand, according to one embodiment of present invention, state computation unit can calculate mean effective pressure, and state regulation unit can make based on this mean effective pressure the combustion regime balance of each cylinder by adjusting the fuel injection quantity of each cylinder.In practice, the target mean effective pressure of cylinder need to decide according to the demand torque of motor.If when the actual average effective pressure of front air cylinder and desired value deviation within the specific limits, can be mainly by adjusting fuel injection quantity, make the actual average effective pressure of each cylinder approaching or reach desired value.If deviation surpasses limit value or motor in the state of catching fire, make relevant cylinder enter corresponding fault diagnosis and dealing state.
On the other hand, according to some embodiments of the present invention, state computation unit can calculate 50% rate of heat release angle, and state regulation unit can the 50% rate of heat release angle based on each cylinder regulate time of ignition by adjust ignition advance angle and the fuel injection quantity of each cylinder simultaneously, thereby makes the combustion regime balance of each cylinder.The adjusting of time of ignition can make each cylinder under thin ignition mode, also keep flameholding.
The present invention realizes accurate measurement and the control to in-cylinder combustion process by increasing cylinder pressure sensor.Engine controller can gather the signal of cylinder pressure sensor, it is carried out to analysis and calculation, thereby obtain the combustion regime information of each cylinder work at present circulation of motor, and according to combustion regime, adjust the control parameter of next each cylinder that circulates, with this, eliminate the lack of uniformity of each cylinder working, improve combustion efficiency and the run stability of motor.
More than enumerate some specific embodiments and illustrated in detail the present invention, these a few examples are only for explanation principle of the present invention and mode of execution thereof, but not limitation of the present invention, without departing from the spirit and scope of the present invention, those of ordinary skill in the art can also make various distortion and improvement.Therefore all technological schemes that are equal to all should belong to category of the present invention and be limited by every claim of the present invention.
Claims (13)
1. a controlling method for multicylinder engine, is characterized in that, described method comprises:
The cylinder that gathers each cylinder in a work cycle is pressed signal and corresponding engine crankshaft corner signal;
According to described cylinder, press signal and described corner signal to calculate the combustion regime information of each cylinder in described work cycle; And
Described combustion regime information pointer based on each cylinder in next work cycle makes the combustion regime balance of each cylinder by adjusting corresponding control parameters of engine to the different combustion modes of motor.
2. the method for claim 1, is characterized in that, described combustion regime information comprises 50% rate of heat release angle of each cylinder, and
At motor, in ignition mode in the situation that, the 50% rate of heat release angle based on each cylinder makes the combustion regime balance of each cylinder by adjusting the ignition advance angle of each cylinder.
3. method as claimed in claim 2, is characterized in that, adjusts ignition advance angle and comprises:
Determine the intermediate value in 50% rate of heat release angle of each cylinder; And
The cylinder that is greater than described intermediate value for 50% rate of heat release angle, increases its ignition advance angle; The cylinder that is less than described intermediate value for 50% rate of heat release angle, reduces its ignition advance angle.
4. method as claimed in claim 2, is characterized in that, described combustion regime information also comprises the rate of pressure rise of each cylinder, and
At motor, in ignition mode in the situation that, also the described rate of pressure rise based on each cylinder makes the combustion regime balance of each cylinder by adjusting the ignition advance angle of each cylinder.
5. method as claimed in claim 4, is characterized in that, adjusts ignition advance angle and comprises:
By the rate of pressure rise of each cylinder and predetermined threshold comparison; And
For the rate of pressure rise, be greater than the cylinder of predetermined threshold, reduce its ignition advance angle.
6. the method for claim 1, is characterized in that, described combustion regime information comprises the mean effective pressure of each cylinder, and
At motor, in homogeneous compression-ignition pattern or thin ignition mode in the situation that, the described mean effective pressure based on each cylinder makes the combustion regime balance of each cylinder by adjusting the fuel injection quantity of each cylinder,
The fuel injection quantity of wherein adjusting respectively each cylinder makes the mean effective pressure of each cylinder approach target mean effective pressure.
7. method as claimed in claim 6, is characterized in that, described combustion regime information also comprises 50% rate of heat release angle of each cylinder, and
At motor in homogeneous compression-ignition pattern in the situation that, also based on described 50% rate of heat release angle by adjusting the intake temperature of each cylinder or the combustion regime balance that fuel injection quantity makes each cylinder.
8. method as claimed in claim 7, is characterized in that, adjusts intake temperature and comprises:
Determine the intermediate value in 50% rate of heat release angle of each cylinder; And
For 50% rate of heat release angle, be greater than the cylinder of described intermediate value, improve its intake temperature or increase its fuel injection quantity; For 50% rate of heat release angle, be less than the cylinder of described intermediate value, reduce its intake temperature or reduce its fuel injection quantity.
9. method as claimed in claim 6, is characterized in that, described combustion regime information also comprises the rate of pressure rise of each cylinder, and
At motor, in compression-ignition mode in the situation that, also the described rate of pressure rise based on each cylinder is by adjusting the intake temperature of each cylinder or the combustion regime balance that fuel injection quantity makes each cylinder.
10. method as claimed in claim 9, is characterized in that, adjusts intake temperature or fuel injection quantity and comprises:
By the rate of pressure rise of each cylinder and predetermined threshold comparison; And
For the rate of pressure rise, be greater than the cylinder of predetermined threshold, reduce its intake temperature or reduce its fuel injection quantity.
11. methods as claimed in claim 6, is characterized in that, described combustion regime information also comprises 50% rate of heat release angle of each cylinder, and
At motor, in thin ignition mode in the situation that, also the 50% rate of heat release angle based on each cylinder is by adjust the ignition advance angle of each cylinder and the combustion regime balance that fuel injection quantity makes each cylinder simultaneously.
12. methods as claimed in claim 6, is characterized in that, are greater than the cylinder of predetermined threshold for the deviation of mean effective pressure and described target mean effective pressure, make this cylinder enter corresponding fault diagnosis and dealing state.
13. 1 kinds of multicylinder engine devices, is characterized in that, described device comprises crankshaft sensor, cylinder pressure sensor and the engine controller corresponding with each cylinder, wherein
Described engine controller comprises:
Data acquisition unit, for gathering the cylinder pressure signal of each cylinder and gather corresponding engine crankshaft corner signal from described crankshaft sensor from described cylinder pressure sensor in a work cycle;
State computation unit, for pressing signal and described corner signal to calculate the combustion regime information of each cylinder in described work cycle according to described cylinder; And
State balance unit, makes the combustion regime balance of each cylinder for the described combustion regime information pointer based on each cylinder in next work cycle by adjusting corresponding control parameters of engine to the different combustion modes of motor.
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| CN108240268A (en) * | 2016-12-27 | 2018-07-03 | 上海汽车集团股份有限公司 | Electronic actuators and its control method in vehicle |
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| CN105697140A (en) * | 2014-12-16 | 2016-06-22 | 通用电气公司 | Multi-fuel engine system |
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| CN108240268B (en) * | 2016-12-27 | 2020-07-14 | 上海汽车集团股份有限公司 | Electronic actuator in vehicle and control method thereof |
| CN110454307A (en) * | 2019-08-28 | 2019-11-15 | 浙江吉利汽车研究院有限公司 | Engine noise reduction method |
| CN110454307B (en) * | 2019-08-28 | 2021-04-23 | 浙江吉利汽车研究院有限公司 | Engine noise reduction method |
| CN114787560A (en) * | 2019-12-03 | 2022-07-22 | 通用电气公司 | Multi-mode combustion control for rotary detonation combustion systems |
| CN114787560B (en) * | 2019-12-03 | 2024-05-07 | 通用电气公司 | Multi-mode combustion control for rotary detonation combustion systems |
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