CN109100148B - Method and device for calculating fuel economy of diesel-natural gas dual-fuel commercial vehicle - Google Patents
Method and device for calculating fuel economy of diesel-natural gas dual-fuel commercial vehicle Download PDFInfo
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Abstract
The invention discloses a method and a device for calculating fuel economy of a diesel-natural gas dual-fuel commercial vehicle, which are based on engine bench test data, are combined with a proposed natural gas consumption reduction method, utilize whole vehicle performance simulation software to apply dynamic working conditions for analysis and comparison, are suitable for economic effect evaluation in the early forward development process of the diesel-natural gas dual-fuel commercial vehicle, and provide technical support for product design. And can quickly provide suggestions on fuel economy to a user during actual use of the vehicle. According to the invention, the diesel oil consumption and the natural gas consumption of the diesel oil-natural gas dual-fuel engine under each working condition are measured through an engine bench test and converted into the total diesel oil consumption; carrying out economic simulation on different circulation working conditions of the diesel commercial vehicle and the diesel-natural gas dual-fuel commercial vehicle through whole vehicle performance simulation software; and finally calculating to obtain the fuel economy of the diesel-natural gas dual-fuel commercial vehicle.
Description
Technical Field
The invention relates to a method and a device for calculating fuel economy of a diesel-natural gas dual-fuel commercial vehicle, which are a method for calculating the fuel economy of the diesel-natural gas dual-fuel commercial vehicle by using a natural gas consumption conversion formula and mature whole vehicle performance simulation software on the basis of engine bench test data, and belong to the field of commercial vehicles.
Background
The natural gas as the vehicle alternative fuel has the outstanding advantages of low emission, high energy storage density, rich resources and the like, and is an ideal alternative energy. Commercial vehicles with diesel-natural gas dual-fuel systems have been popularized and used, and the economical efficiency of the commercial vehicles becomes the focus of attention of users and enterprises. In the early forward development process of products, due to the fact that a dual-fuel system is influenced by multiple parameters such as oil gas price and substitution rate, the defects that accurate quantification is difficult to achieve and dynamic working condition analysis is lacked exist in the process of calculating the economic effect, and at present, evaluation is simplified mainly according to steady-state working conditions and average substitution rate. The invention aims to provide a new method for calculating the fuel economy of the diesel-natural gas dual-fuel commercial vehicle in the forward development process.
Disclosure of Invention
The invention is based on the engine bench test data, combines the proposed natural gas consumption reduction method, utilizes the whole vehicle performance simulation software to apply dynamic working conditions for analysis and comparison, and is suitable for the economic effect evaluation in the early forward development process of the diesel-natural gas dual-fuel commercial vehicle. The invention relates to a new idea for calculating fuel economy of a diesel-natural gas dual-fuel commercial vehicle by using a natural gas consumption conversion formula and mature whole vehicle performance simulation software on the basis of engine bench test data.
The technical scheme of the invention is as follows: respectively measuring the diesel hour consumption of the diesel engine under each working condition and the diesel hour consumption and the natural gas consumption of the diesel-natural gas dual-fuel engine under each working condition through an engine bench test; converting the natural gas consumption of the diesel-natural gas dual-fuel engine into the diesel hour consumption according to the price of natural gas and diesel, and obtaining the diesel hour consumption of the dual-fuel engine; respectively establishing models of a diesel commercial vehicle and a diesel-natural gas dual-fuel commercial vehicle by using complete vehicle performance simulation software, adding a simulation task and applying C-WTVC to circulate urban areas, roads and high-speed parts, and performing simulation calculation to obtain the hundred kilometer fuel consumption of different parts of the diesel commercial vehicle and the diesel-natural gas dual-fuel commercial vehicle; weighting and calculating to obtain hundred kilometers of comprehensive fuel consumption of different vehicle types; and finally, calculating the money saving rate of the diesel oil-natural gas dual-fuel commercial vehicle.
Further, the C-WTVC cycle is derived from the national standard GB/T27840-2011 method for measuring fuel consumption of heavy commercial vehicles.
The invention provides a method for calculating fuel economy of a diesel-natural gas dual-fuel commercial vehicle, which comprises the following steps:
step 1, carrying out an engine bench test, and converting diesel oil consumption and natural gas consumption of the diesel oil-natural gas dual-fuel engine under each working condition measured by the engine bench test into total diesel oil consumption;
and 3, calculating the fuel economy index of the diesel-natural gas dual-fuel commercial vehicle according to the comprehensive hundred-kilometer fuel consumption data obtained in the step.
Illustratively, in step 1, the engine bench test measures the fuel consumption and the natural gas consumption of the engine according to GB/T18297-2001 automobile engine performance test method.
For example, in the step 1, the diesel consumption and the natural gas consumption of the diesel-natural gas dual-fuel engine under each working condition are converted into the total diesel consumption according to the following formulas:
in the formula:
FCfolding deviceThe total diesel oil consumption of the diesel oil-natural gas dual-fuel engine after conversion is kg/h;
Dieselconsumption ofDiesel-natural gas bisThe hourly consumption of diesel oil of the fuel engine is kg/h;
NGconsumption ofThe natural gas consumption of the diesel oil-natural gas dual-fuel engine is kg/min;
NGunit price of-market price of natural gas in units of yuan/kg;
Dieselunit price of-market price of diesel in units of dollars per liter;
ρDieseldiesel density, 0.85 kg/L.
Illustratively, the method comprises the following steps:
during modeling, model building is carried out according to different power assemblies and transmission systems, and connection relations among the modules are built;
-inputting the data obtained by engine bench test and the FC calculated by formula in diesel commercial vehicle model and diesel-natural gas dual-fuel commercial vehicle model, respectivelyFolding deviceThe hourly consumption of diesel oil is reduced;
adding calculation tasks of urban areas, roads and high speeds in the C-WTVVC cycle to obtain the hundred kilometer fuel oil consumption of diesel commercial vehicles and diesel-natural gas dual-fuel commercial vehicles in the urban areas, the roads and the high speed cycle.
Exemplarily, in step 2, the overall vehicle economy is calculated according to GB/T27840-:
FCsynthesis of＝FCUrban area×DUrban area+FCRoad×DRoad+FCHigh speed×DHigh speed
In the formula:
FCsynthesis of-integrated fuel consumption in L/100km for a complete C-WTVC cycle;
FCurban areaDepartment of urban areaDividing the average fuel consumption into L/100 km;
FCroad-average fuel consumption of the highway section in L/100 km;
FChigh speed-high speed section average fuel consumption in L/100 km;
Durban area-urban mileage distribution proportion coefficient, unit is%;
Droad-road mileage distribution scale factor in units;
Dhigh speedAnd (4) distributing proportion coefficient of the high-speed mileage in percentage.
For example, in step 3, the economy of a diesel-natural gas dual fuel commercial vehicle is calculated according to the following formula:
in the formula:
the L-diesel oil-natural gas dual-fuel commercial vehicle has a lower cost saving rate in unit than a diesel oil commercial vehicle;
FCintegrated DieselThe hundred kilometer comprehensive fuel consumption of the C-WTVVC cycle of the diesel commercial vehicle is L/100 km;
FCintegrated Diesel-LNGAnd the comprehensive hundred-kilometer fuel consumption of the diesel oil-natural gas dual-fuel commercial vehicle in running C-WTVC circulation is L/100 km.
Illustratively, the diesel density is 0.85kg/L
Another aspect of the present invention provides a device for calculating fuel economy of a diesel-natural gas dual-fuel commercial vehicle, comprising a processor, a memory and a computer program stored in the memory, wherein the computer program realizes the calculation method when being executed by the processor.
Drawings
The invention is further illustrated by the following figures and examples:
FIG. 1 is a block diagram of one embodiment of a computing method and apparatus for implementing the present invention;
FIG. 2 is a graph showing the consumption rate of crude fuel;
FIG. 3 is a graph of the integrated fuel consumption rate of a diesel-natural gas dual-fuel engine after conversion.
Detailed Description
The invention will now be further described with reference to specific embodiments and drawings.
Fig. 1 shows a structural block diagram in an embodiment, wherein a method for calculating fuel economy of a diesel-natural gas dual-fuel commercial vehicle comprises the following specific technical means:
and (3) carrying out an engine bench test, and respectively measuring the hourly diesel oil consumption of the diesel oil engine, the hourly diesel oil consumption of the diesel oil-natural gas dual-fuel engine and the natural gas consumption of the diesel oil engine under different rotating speeds and torques according to the requirements of GB/T18297-2001 automobile engine performance test method.
Converting the measured diesel hour consumption and natural gas consumption of the diesel-natural gas dual-fuel engine into the total diesel hour consumption of the dual-fuel engine by a formula (1):
in the formula:
FCfolding deviceThe total diesel oil consumption of the diesel oil-natural gas dual-fuel engine after conversion is kg/h;
Dieselconsumption ofThe hourly consumption of diesel oil of the diesel oil-natural gas dual-fuel engine is kg/h;
NGconsumption ofThe natural gas consumption of the diesel oil-natural gas dual-fuel engine is kg/min;
NGunit price of-market price of natural gas in units of yuan/kg;
Dieselunit price of-market price of diesel in units of dollars per liter;
ρDieseldiesel density, 0.85 kg/L.
In one embodiment, the experimental data are obtained as set forth in the following table.
Table 1: conversion table for diesel consumption of diesel-natural gas dual-fuel engine
A simulation model of the diesel engine commercial vehicle and the diesel oil-natural gas dual-fuel commercial vehicle is established in the whole vehicle performance simulation software. Building models according to different power assemblies and transmission systems, and establishing connection relations among the modules; respectively inputting data obtained by engine bench test and FC calculated by formula (1) into a diesel engine commercial vehicle model and a diesel-natural gas dual-fuel commercial vehicle modelFolding deviceThe hourly consumption of diesel oil is reduced; adding part of calculation tasks of urban areas, roads and high speeds in the C-WTVVC cycle to obtain the fuel oil consumption FC of hundred kilometers of diesel commercial vehicles and diesel-natural gas dual-fuel commercial vehicles in the urban areas, the roads and the high speed cycleUrban area、FCRoadAnd FCHigh speed。
Determining the distribution proportion of the characteristic mileage of the urban area, the highway and the high-speed part according to different vehicle types and the maximum total design mass specified in GB/T27840-2011 'measuring method for fuel consumption of heavy commercial vehicles', and calculating the comprehensive hundred-kilometer fuel consumption in a weighting manner according to a formula (2).
FCSynthesis of＝FCUrban area×DUrban area+FCRoad×DRoad+FCHigh speed×DHigh speed(2)
In the formula:
FCsynthesis of-integrated fuel consumption in L/100km for a complete C-WTVC cycle;
FCurban area-urban part average fuel consumption in L/100 km;
FCroad-average fuel consumption of the highway section in L/100 km;
FChigh speed-high speed section average fuel consumption in L/100 km;
Durban area-urban mileage distribution proportion coefficient, unit is%;
Droad-road mileage distribution scale factor in units;
Dhigh speed-high speed mileage distribution proportion coefficient, unit is%;
and (4) calculating the money saving rate of the diesel oil-natural gas dual-fuel commercial vehicle according to the formula (3).
In the formula:
the L-diesel oil-natural gas dual-fuel commercial vehicle has a lower cost saving rate in unit than a diesel oil commercial vehicle;
FCintegrated DieselThe hundred kilometer comprehensive fuel consumption of the C-WTVVC cycle of the diesel commercial vehicle is L/100 km;
FCintegrated Diesel-LNGAnd the comprehensive hundred-kilometer fuel consumption of the diesel oil-natural gas dual-fuel commercial vehicle in running C-WTVC circulation is L/100 km.
Table 2 below shows the results of an analysis of the economy of a diesel-natural gas dual fuel commercial vehicle obtained in one embodiment.
TABLE 2 Diesel-Natural gas Dual-Fuel commercial vehicle economics
Another embodiment of the present invention also provides a device for calculating fuel economy of a diesel-natural gas dual fuel commercial vehicle, comprising a processor, a memory and a computer program stored in the memory, which when executed by the processor, can implement the method as described above.
According to the computing device provided by the embodiment of the invention, the fuel economy of the diesel-natural gas dual-fuel commercial vehicle can be computed, technical support is provided for product design, and in the actual use process of the vehicle, suggestions on fuel economy can be rapidly provided for users.
Those of ordinary skill in the art will appreciate that the various illustrative algorithmic steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The method according to embodiments of the present invention may be implemented by a processor according to embodiments of the present invention running computer program instructions stored in a memory, or may be implemented when computer instructions stored in a computer readable storage medium of a computer program product according to embodiments of the present invention are run by a computer.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the foregoing illustrative embodiments are merely exemplary and are not intended to limit the scope of the invention thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as set forth in the appended claims.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another device, or some features may be omitted, or not executed.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present invention should not be construed to reflect the intent: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It will be appreciated by those skilled in the art that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some of the modules in an item analysis apparatus according to embodiments of the present invention. The present invention may also be embodied as apparatus programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above description is only for the specific embodiment of the present invention or the description thereof, and the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A method for calculating fuel economy of a diesel-natural gas dual-fuel commercial vehicle comprises the following steps:
step 1, carrying out an engine bench test, and converting diesel oil consumption and natural gas consumption of the diesel oil-natural gas dual-fuel engine under each working condition measured by the engine bench test into total diesel oil consumption;
the diesel consumption and the natural gas consumption of the diesel-natural gas dual-fuel engine under various working conditions are converted into total diesel consumption according to the following formula:
in the formula:
FCfolding deviceThe total diesel oil consumption of the diesel oil-natural gas dual-fuel engine after conversion is kg/h;
Dieselconsumption ofThe hourly consumption of diesel oil of the diesel oil-natural gas dual-fuel engine is kg/h;
NGconsumption ofThe natural gas consumption of the diesel oil-natural gas dual-fuel engine is kg/min;
NGunit price of-market price of natural gas in units of yuan/kg;
Dieselunit price of-market price of diesel in units of dollars per liter;
ρDieseldiesel density, 0.85 kg/L;
step 2, establishing simulation models of the diesel commercial vehicle and the diesel-natural gas dual-fuel commercial vehicle in the whole vehicle performance simulation software, carrying out economic simulation on different circulation working conditions, and obtaining comprehensive hundred kilometer fuel consumption data corresponding to the diesel commercial vehicle and the diesel-natural gas dual-fuel commercial vehicle weighted by the different circulation working conditions;
during modeling, model building is carried out according to different power assemblies and transmission systems, and connection relations among the modules are built;
-inputting the data obtained by engine bench test and the FC calculated by formula in diesel commercial vehicle model and diesel-natural gas dual-fuel commercial vehicle model, respectivelyFolding deviceThe hourly consumption of diesel oil is reduced;
adding part of calculation tasks of urban areas, roads and high speeds in the C-WTVVC cycle to obtain the hundred kilometer fuel oil consumption of diesel commercial vehicles and diesel-natural gas dual-fuel commercial vehicles in the urban areas, the roads and the high speed cycle;
and 3, calculating the fuel economy index of the diesel-natural gas dual-fuel commercial vehicle according to the comprehensive hundred-kilometer fuel consumption data obtained in the step.
2. The calculation method according to claim 1, wherein in step 1, the engine bench test measures the fuel consumption and the natural gas consumption of the engine according to GB/T18297-2001 "test method for the performance of automotive engines".
3. The calculation method according to claim 1, wherein in step 2, the vehicle economy is calculated according to GB/T27840-2011 'measuring method of fuel consumption of heavy commercial vehicles', the fuel consumption is calculated in a vehicle performance simulation software by taking C-WVC circulation as a working condition, the characteristic mileage distribution proportion of urban areas, roads and high-speed parts of the vehicle type is determined according to the vehicle type and the maximum total design mass, and the hundred kilometer comprehensive fuel consumption of two vehicle types is respectively calculated according to the following formula weighting:
FCsynthesis of＝FCUrban area×DUrban area+FCRoad×DRoad+FCHigh speed×DHigh speed
In the formula:
FCsynthesis of-integrated fuel consumption in L/100km for a complete C-WTVC cycle;
FCurban area-urban part average fuel consumption in L/100 km;
FCroad-average fuel consumption of the highway section in L/100 km;
FChigh speed-high speed section average fuel consumption in L/100 km;
Durban area-urban mileage distribution proportion coefficient, unit is%;
Droad-road mileage distribution scale factor in units;
Dhigh speedAnd (4) distributing proportion coefficient of the high-speed mileage in percentage.
4. Calculation method according to any one of claims 1 to 3, characterised in that in step 3 the economy of a diesel-natural gas dual fuel commercial vehicle is calculated according to the following formula:
in the formula:
the L-diesel oil-natural gas dual-fuel commercial vehicle has a lower cost saving rate in unit than a diesel oil commercial vehicle;
FCintegrated DieselThe hundred kilometer comprehensive fuel consumption of the C-WTVVC cycle of the diesel commercial vehicle is L/100 km;
FCintegrated Diesel-LNGAnd the comprehensive hundred-kilometer fuel consumption of the diesel oil-natural gas dual-fuel commercial vehicle in running C-WTVC circulation is L/100 km.
5. A device for calculating fuel economy of a diesel-natural gas dual fuel commercial vehicle, characterized by a processor, a memory and a computer program stored in the memory, which program, when executed by the processor, carries out the method of any one of claims 1 to 4.
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| US11592323B2 (en) * | 2021-02-04 | 2023-02-28 | Chengdu Qinchuan Iot Technology Co., Ltd. | Methods and systems for measuring energy of natural gas in a full cycle |
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