CN111734539B - Method for measuring and judging cylinder-stopping state and fuel-saving amount of gasoline engine for vehicle - Google Patents
Method for measuring and judging cylinder-stopping state and fuel-saving amount of gasoline engine for vehicle Download PDFInfo
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- CN111734539B CN111734539B CN202010462582.0A CN202010462582A CN111734539B CN 111734539 B CN111734539 B CN 111734539B CN 202010462582 A CN202010462582 A CN 202010462582A CN 111734539 B CN111734539 B CN 111734539B
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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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
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides a method for measuring and judging the cylinder-stopping state and the fuel-saving amount of a gasoline engine for a vehicle, which comprises the following steps: the method comprises the following steps: s1, measuring an ignition signal of a designated cylinder deactivation cylinder; s2, measuring ignition signals of cylinders without cylinder deactivation; s3, comparing the difference between the two, judging whether the engine is in a cylinder-stopping state, if so, judging that the engine is in a non-cylinder-stopping state, and if not, judging that the engine is in the cylinder-stopping state. The method for measuring and judging the cylinder-stopping state and the fuel-saving amount of the vehicle gasoline engine can accurately judge the cylinder-stopping state of the vehicle gasoline engine and calculate the fuel-saving amount in the running process.
Description
Technical Field
The invention belongs to the technical field of fuel saving of internal combustion engines and automobiles, and particularly relates to a method for measuring and judging the cylinder-stopping state and the fuel saving amount of an automobile gasoline engine.
Background
The cylinder deactivation technology is an oil saving technology of the traditional internal combustion engine automobile, and can achieve oil saving benefits when being applied to 3-cylinder engines, 4-cylinder engines, 6-cylinder engines and more-cylinder engines of the automobile. In addition to a dynamic skip fire deactivation technique, abbreviated as DSF, and a turnover type deactivation technique, named "Rolling Cylinder Deactivation", the mainstream "specified cylinder deactivation" cylinder deactivation technique is currently employed.
The fuel-saving effect depends on the real-time cylinder deactivation of a specified cylinder: the more the cylinder deactivation time is, the stronger the oil saving effect is. Whether cylinder deactivation is performed or not mainly depends on the requirement on the vehicle speed (namely, a circulation working condition curve when the vehicle chassis dynamometer is on an actual road, and operations applied to an accelerator, a brake and the like by a driver after comprehensive judgment) conditions: vehicle ECU usually selects cruise travel and deceleration timing at medium and low speeds to implement cylinder deactivation.
Disclosure of Invention
In view of the above, the present invention is to overcome the defects in the prior art, and provides a method for measuring and judging the cylinder-stopping state and fuel-saving amount of a gasoline engine for a vehicle.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method for measuring and judging cylinder deactivation state of a gasoline engine for a vehicle comprises the following steps:
s1, an ignition electromagnetic pulse sensor A measures an ignition signal of a specified cylinder deactivation cylinder;
s2, an ignition electromagnetic pulse sensor B measures an ignition signal of a cylinder without cylinder deactivation;
s3, comparing the difference between the two, judging whether the engine is in a cylinder-stopping state, if so, judging that the engine is in a non-cylinder-stopping state, and if not, judging that the engine is in the cylinder-stopping state.
Further, the specific steps of measuring the ignition signal in the steps S1 and S2 are as follows:
A1. clamping an ignition electromagnetic pulse sensor on a low-voltage primary side wire or a high-voltage secondary side wire of an ignition coil of a cylinder to be tested for measurement;
A2. the data acquisition system acquires an ignition pulse signal;
A3. the pulse signal is converted into an analog voltage signal, namely the ignition signal. The voltage value is then k times the "number of ignitions per second", k being a known and fixed value.
Further, in the step S3, the voltage values of the two analog voltage signals are zero and are in a fuel cut-off (each cylinder stops injecting fuel); in the step S3, when the voltage values of the two analog voltage signals are non-zero, the difference between the voltage values is greater than 25%, and the two analog voltage signals are in a cylinder-stopping state.
A fuel saving amount calculating method based on the method for measuring and judging the cylinder deactivation state of the gasoline engine for the vehicle according to claim 1, wherein the formula is as follows:
q in the formula reservation Fuel saving amount t for one-time driving CDA For the accumulated value of cylinder deactivation operation time, alpha is a typical value of cylinder deactivation oil saving rate at medium and low speeds,
the average value of the injection volume per unit time in the cylinder deactivation period is obtained.
Further, the accumulated value t of the cylinder deactivation time CDA The specific calculation process of (2) is as follows:
B1. making a graph of the ignition signal changing with time according to the voltage value and time of the two analog voltage signals;
B2. the cylinder deactivation time t is shown in the graph Diff I.e. the time of the deactivated state;
B3. accumulated value t of cylinder deactivation time CDA Namely each t in the graph Diff Is added to the accumulated value of (a).
Further, the said
Each t is acquired by adopting a tail gas analyzer Diff Average value of fuel consumption per second calculated by transient real-time tail gas value conversion.
Compared with the prior art, the invention has the following advantages:
vehicles with cylinder deactivation functionality are typically not equipped with corresponding manually operated switch buttons that cannot be manually disabled by a typical operator such as a driver. This makes it impossible to take the "function on.vs. function Off" measure of the fuel saving effect test evaluation (the latter, for example, idle start-stop fuel saving effect evaluation), so that a new test evaluation method is required. The test and evaluation of the fuel saving capability has various application values: (1) the method is used as a basis for identifying the fuel-saving technology, (2) one of the components of the fuel-saving standard system in the 5 th stage of China, (3) providing objective data of fuel-saving benefits of the cylinder-stopping technology for domestic masses, improving the acceptance willingness of the public to the cylinder-stopping technology, promoting the market introduction of new technology, saving fuel and reducing emission of China, and the like.
The method can achieve the measurement of key parameters of a cylinder deactivation technology oil saving calculation formula of the designated cylinder deactivation, and can calculate the oil saving amount of the cylinder deactivation technology in the driving process by being assisted with two parameters, namely a typical value of cylinder deactivation oil saving rate at medium and low speeds and an average value of oil injection volume per unit time in the cylinder deactivation operation period. The value alpha can be from the consensus value discussed in the automotive industry
The average of the fuel consumption per second may be derived from transient real-time exhaust gas values of the exhaust gas analyzer device during each cylinder deactivation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a graph of signals measured by a sensor A, B on an in-line 4-cylinder engine equipped with cylinder deactivation technology in accordance with an inventive embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an ignition signal testing procedure according to an embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the on-off of the 1 st cylinder and the ignition signal in 780 rpm according to the inventive example;
FIG. 4 is a graph showing the relationship between the on-off of the 1 st cylinder and the voltage pulse and the voltage signal in 780 rpm according to the inventive example;
FIG. 5 is a schematic diagram of engine speed versus voltage according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of engine speed and voltage according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of ECU ignition signal versus voltage at about 4000 rpm according to an inventive embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1-7, the cylinder deactivation technology is an oil saving technology of a traditional internal combustion engine automobile, and has been applied to 3-cylinder engines, 4-cylinder engines, 6-cylinder engines and more cylinder engines for automobiles, so that oil saving benefits can be achieved. In addition to a dynamic skip fire deactivation technique, abbreviated as DSF, and a turnover type deactivation technique, named "Rolling Cylinder Deactivation", the mainstream "specified cylinder deactivation" cylinder deactivation technique is currently employed.
The fuel-saving effect depends on the real-time cylinder deactivation of a specified cylinder: the more the cylinder deactivation time is, the stronger the oil saving effect is. Whether cylinder deactivation is performed or not mainly depends on the requirement on the vehicle speed (namely, a circulation working condition curve when the vehicle chassis dynamometer is on an actual road, and operations applied to an accelerator, a brake and the like by a driver after comprehensive judgment) conditions: vehicle ECU usually selects cruise travel and deceleration timing at medium and low speeds to implement cylinder deactivation.
In the case of the cylinder deactivation technique of "specified cylinder deactivation", the fuel saving amount Q for one run may be based on the "cylinder deactivation operation time accumulated value t CDA Typical values of fuel-saving rate of cylinder deactivation at medium and low speeds (for example, about 20% of the value proposed by Jili automobile company, etc.) "," average fuel injection volume per unit time in cylinder deactivation period
"these 3 parameters are calculated, see formula. The use of the fuel saving Q value is, for example (but not limited to) 'method for evaluating energy saving effect of technology/apparatus outside the passenger car circulation'.
The formula:
the key point of testing and evaluating the fuel saving of the cylinder deactivation technology of the designated cylinder deactivation by using the formula is to obtain t by adopting test equipment outside the vehicle for measurement CDA (values provided by the vehicle ECU cannot be used). In the arithmetic type
The method is based on a carbon balance method and calculated from transient data of an exhaust gas analyzer, and is a mature technology. The typical value α depends on the total number of engine cylinders and the method of cylinder deactivation, for example, the values of "3 cylinders for a 6-cylinder engine and" 2 cylinders for a 5-cylinder engine "may differ slightly from those of" 2 cylinders for a 4-cylinder engine ".
In order to calculate the fuel saving amount of the gasoline engine under the cylinder deactivation technology, test equipment is adopted to measure and judge the cylinder deactivation state of the gasoline engine in real time, so as to obtain the accumulated value t of the cylinder deactivation operation time CDA . For this purpose, measure "specifyComparing the difference between the ignition signal of the cylinder deactivation cylinder and the ignition pulse signal of the cylinder without cylinder deactivation, and judging whether the engine is in a cylinder deactivation state or not: basically, the cylinder is not stopped when the two are identical, and the cylinder is stopped when the two are not identical.
The ignition of a cylinder is measured by means of a sensor sensing the ignition pulse signal. One sensor measures the ignition signal of the designated cylinder which is deactivated, the other sensor measures the ignition signal of the cylinder which is not deactivated, and the difference between the two signals is compared to judge whether the engine is in a cylinder deactivation state or not: the cylinder is not stopped when the two are different, namely the cylinder is stopped (the same refers to the conditions that (1) are both zero and (2) are not zero, and the difference is less than 25%).
As shown in fig. 2, an in-line 4-cylinder gasoline engine having an ignition sequence of 1-2-4-3 and a configuration in which the 2 nd and 3 rd cylinders are deactivated is exemplified: clamping an ignition electromagnetic pulse sensor A on a low-voltage primary side wire or a high-voltage secondary side wire of an ignition coil of a1 st cylinder for measurement; the other ignition electromagnetic pulse sensor B is clamped on a low-voltage primary side wire or a high-voltage secondary side wire of the ignition coil of the 3 rd cylinder. The two pulse signals (or analog voltage signals converted from the pulse signals) are acquired by a data acquisition system, wherein the voltage value is k times of ignition times per second, and k is a known and fixed value. One example of signals from A and B is shown in FIG. 1.
Accumulated value t of cylinder deactivation time CDA Namely each t in the diagram Diff Is added to the accumulated value of (a).
In addition to the accumulated value of cylinder deactivation time, each cylinder deactivation time point in the test cycle can be marked by the method and can support
Is calculated by the computer.
For other specified cylinder deactivation methods, such as "6-cylinder engine deactivated 3 cylinders", "5-cylinder engine deactivated 2 cylinders", the corresponding 2 cylinders are selected for measurement and signal comparison according to the above principles.
Vehicles with cylinder deactivation functionality are typically not equipped with corresponding manually operated switch buttons that cannot be manually disabled by a typical operator such as a driver. This makes it impossible to take the "function on.vs. function Off" measure of the fuel saving effect test evaluation (the latter, for example, idle start-stop fuel saving effect evaluation), so that a new test evaluation method is required. The test and evaluation of the fuel saving capability has various application values: (1) the method is used as a basis for identifying the fuel-saving technology, (2) one of the components of the fuel-saving standard system in the 5 th stage of China, (3) providing objective data of fuel-saving benefits of the cylinder-stopping technology for domestic masses, improving the acceptance willingness of the public to the cylinder-stopping technology, promoting the market introduction of new technology, saving fuel and reducing emission of China, and the like.
The method can achieve the key parameter t of the oil saving calculation formula of the cylinder deactivation technology of the designated cylinder CDA Is aided by the parameters of ' typical value alpha of cylinder deactivation fuel saving rate at medium and low speed ' and ' average value of fuel injection volume per unit time in cylinder deactivation operation period
The two parameters can calculate the oil saving amount of the cylinder deactivation technology in the driving process. The value α can be derived from the consensus value discussed in the automotive industry, the value +.>
May come from an exhaust gas analyzer device at each t Diff Average value of fuel consumption per second calculated by transient real-time tail gas value conversion.
The method uses one sensor for sensing ignition pulse signals to measure the ignition signals of the designated cylinder which is stopped, and the other sensor for sensing ignition pulse signals to measure the ignition signals of the cylinder which is not stopped, and compares the difference between the two signals to judge whether the engine is in a cylinder stopping state, so that the accumulated value t of the cylinder stopping operation time can be accurately and conveniently measured CDA 。
The limitation of this method is that the method can only be used for measuring the cylinder deactivation of the designated cylinder, and is not applicable to the dynamic skip fire cylinder deactivation DSF technology and the turnover cylinder deactivation technology Rolling Cylinder Deactivation.
Another method inferior to the present method is: one sensor A for sensing ignition pulse signals measures ignition signals of a designated cylinder to stop, and the other sensor C for sensing vibration signals of an engine cylinder body measures engine rotating speed signals, and the two signals are compared to judge whether the engine is in a cylinder-stopping state. This approach has the disadvantage that when the vehicle is at a deceleration fuel cut (see t in the figure diff1 Two seconds after the cut-off point), the signal of sensor C is not zero and the signal value of sensor a is zero, both of which are different, but the engine is not in a deactivated state.
The technology of sensing ignition pulse signals and analog voltage signals (voltage values represent ignition times per second) which are further converted based on the sensor is other patents and is not the benefit of the patent claims.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The method for measuring and judging the cylinder-stopping state and the fuel-saving amount of the automobile gasoline engine is characterized by comprising the following steps:
s1, measuring an ignition signal of a designated cylinder deactivation cylinder;
s2, measuring ignition signals of cylinders without cylinder deactivation;
s3, comparing the difference between the two, judging whether the engine is in a cylinder-stopping state, if so, judging that the engine is in a non-cylinder-stopping state, and if not, judging that the engine is in the cylinder-stopping state;
the specific steps of measuring the ignition signal in the steps S1 and S2 are as follows:
A1. clamping an ignition electromagnetic pulse sensor on a low-voltage primary side wire or a high-voltage secondary side wire of an ignition coil of a cylinder to be tested for measurement;
A2. the data acquisition system acquires an ignition pulse signal;
A3. converting the pulse signal into an analog voltage signal, namely the ignition signal;
the specific method for comparing the difference between the two ignition signals in the step S3 is as follows:
the voltage values of the two analog voltage signals are in a fuel cut-off state when the voltage values of the two analog voltage signals are zero, and the cylinder is in a cylinder cut-off state when the voltage value difference of the two analog voltage signals is more than 25%;
the fuel saving amount calculating method comprises the following steps:
q in the formula reservation Fuel saving amount t for one-time driving CDA For the accumulated value of cylinder deactivation operation time, alpha is a typical value of cylinder deactivation oil saving rate at medium and low speeds,
the average value of the injection volume per unit time in the cylinder deactivation period is obtained;
the accumulated value t of the cylinder deactivation time CDA The specific calculation process of (2) is as follows:
B1. making a graph of the ignition signal changing with time according to the voltage value and time of the two analog voltage signals;
B2. the cylinder deactivation time t is shown in the graph Diff I.e. the time of the deactivated state;
B3. accumulated value t of cylinder deactivation time CDA Namely each t in the graph Diff Is a cumulative value of (a);
the said
Each t is acquired by adopting a tail gas analyzer Diff Average value of fuel consumption per second calculated by transient real-time tail gas value conversion. />
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| JP4353475B2 (en) * | 2004-08-18 | 2009-10-28 | 日産ディーゼル工業株式会社 | Fuel consumption evaluation system |
| JP4767312B2 (en) * | 2008-12-24 | 2011-09-07 | 本田技研工業株式会社 | Device for determining cylinder deactivation |
| US11053908B2 (en) * | 2018-05-21 | 2021-07-06 | Ford Motor Company | Device and method for detecting a cylinder deactivation mode using inferred compression |
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Non-Patent Citations (3)
| Title |
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| 断油回流停缸策略对发动机油耗及轴系扭振的影响;魏子清等;《内燃机工程》;20190630;第94-101页 * |
| 陈志恒等.汽车电控技术.《汽车电控技术》.2003,第108页. * |
| 黎苏等.汽车发动机动态过程及其控制.《汽车发动机动态过程及其控制》.2001,第125页. * |
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