JP2007172552A - Support system for designing internal-combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support system for designing an internal-combustion engine which can present a combination of specifications of an internal-combustion engine, which is to be designed, for target performance set to a planned vehicle. <P>SOLUTION: The support system includes; a database 1 which stores the prescribed parameter data, kinds of prescribed specifications and performance parameter values of prescribed performance parameters of existing internal-combustion engines; a performance computation part 21 which computes performance parameter values in prescribed performance items of at least one internal-combustion engine model which is obtained by changing the parameter values and combinations of kinds of specifications of basic internal-combustion engines selected from among the existing internal-combustion engines; and a presentation part 22 which outputs at least each one of the parameter values and combinations of the kinds of the specifications of the internal-combustion engine model, whose performance values are computed by the performance computation part 21, according to the prescribed conditions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an internal combustion engine design support system using a computer, and more specifically, by presenting a combination of the specifications of an internal combustion engine to be designed, etc., with respect to a target performance set in a planned vehicle. The present invention relates to an internal combustion engine design support system that supports engine design.

  The following Patent Document 1 describes a design in which a piston and an intake port of an internal combustion engine, for example, an engine are designed using 3D (3D) -CAD (computer aided design) software in order to improve engine design efficiency. A support system is disclosed.

Japanese Patent Laid-Open No. 2005-100054

  In general, when a new vehicle is planned, various target performances are set for the power performance, fuel consumption performance, etc. of the planned vehicle so as to stand in a sales advantageous position with respect to a competing vehicle (benchmark vehicle). These target performances are usually set higher than the performance of conventional vehicles at the time of planning in anticipation of higher performance of benchmark vehicles at the start of sales. For this reason, each design department is required to design a planning vehicle that achieves these higher target performances.

  By the way, a plurality of elements of a vehicle usually contribute to various performance items of the vehicle. For example, not only the fuel efficiency of the engine itself but also the powertrain transmission gear ratio, tire rolling resistance, vehicle weight, and other factors affect the fuel efficiency of the vehicle. For this reason, each target performance usually involves multiple design departments.

  However, in the past, in order to achieve the target performance, what kind of division should be assigned to each design department, that is, how much the performance of the related elements that each design department should be responsible for should be determined. The objective and technical basis for this was not always clear. For example, in order to achieve the target performance value of the vehicle fuel consumption, the basis for how much the performance of each related element such as the engine fuel consumption rate and the vehicle weight should be improved is not clear.

  The individual design departments design independently because their development contents are completely different from each other. As a result, it may be found that the target performance of the vehicle as a whole is not achieved after each design department issues a design drawing. For this reason, it is necessary to redo the design in each design department, and the efficiency of vehicle planning may be reduced.

  Accordingly, an object of the present invention is to provide an internal combustion engine design support system capable of presenting a combination of specifications of an internal combustion engine to be designed with respect to a target performance set for a planned vehicle.

  In order to achieve the above object, an internal combustion engine design support system according to the present invention is a design support system for an internal combustion engine, which is a predetermined specification value, a predetermined specification type, and a predetermined performance related to an existing internal combustion engine. A database that stores data on the performance values of the items, a specification value of at least one internal combustion engine model in which a combination of specification values and specification types of the basic internal combustion engine selected from the existing internal combustion engines is changed. Performance calculation means for calculating performance values, and combination presentation means for outputting at least one or more combinations of specification values and specification types of the internal combustion engine model for which the performance values have been calculated by the performance calculation means according to a predetermined condition; It is characterized by providing.

  According to the internal combustion engine design support system of the present invention configured as described above, various combinations of internal combustion engine models can be presented under predetermined conditions. Thereby, it is possible to present a combination such as the specification of the internal combustion engine to be designed with respect to the target performance set in the planned vehicle. Then, in order to achieve the target performance, the assignment of the presented combination of vehicle model specifications and the like to the design department of each internal combustion engine, that is, to determine the performance of the related elements in charge of the internal combustion engine design department. It can be used as an objective and technical basis. At the same time, according to the present invention, it is possible to determine a combination of specification values and specification types of the internal combustion engine to be designed from the presented contents. Therefore, it is possible to easily determine the design direction of the internal combustion engine and improve the design efficiency.

  Preferably, in the present invention, the types of the predetermined specifications stored in the database include the presence / absence of a supercharger, a fuel injection method, fuel used, presence / absence of a variable valve timing mechanism, a valve mechanism, and an intake air / At least one of the number of exhaust valves is included. Changes in these types of specifications have a significant impact on various engine performance values.

  In the present invention, it is preferable that the predetermined specification value stored in the database includes an exhaust amount. This change in the specification value has a great influence on various performance values of the engine.

  In the present invention, preferably, the predetermined performance item calculated by the performance calculation means includes fuel consumption. This performance item is an important performance item in engine design.

  Preferably, in the present invention, the performance calculation means calculates a predetermined performance value for all combinations of a predetermined specification value and a predetermined specification type under a predetermined constraint condition. As described above, if all combinations are calculated, all options of combinations that may achieve the target performance value can be examined without omission under a predetermined constraint condition.

  In the present invention, it is preferable that the predetermined condition in the performance presenting means is in the order of low cost or high performance value. If the combination of specification values and specification types of the internal combustion engine model is presented in order from the lowest cost, the specifications of the internal combustion engine that should be designed at a lower cost than the target performance set in the planned vehicle, etc. Can be presented. In addition, if the combination of specification values and specifications of the internal combustion engine model are presented in order of performance, the internal combustion engine to be designed with higher performance than the target performance set for the planned vehicle. Outline of specifications etc. can be presented.

Preferably, in the present invention, the performance presentation means selectively presents a combination of the specification value and the specification type of the internal combustion engine model only when the performance value satisfies the target performance value, or The performance value that satisfies the target performance value is distinguished from the one that does not satisfy the target performance value.
Thereby, it is possible to easily grasp what kind of specification is necessary to achieve the performance target.

Embodiments according to the present invention will be described below with reference to the accompanying drawings.
First, with reference to FIG. 1, the structure for implement | achieving the internal combustion engine design support system of this embodiment is demonstrated.

  As shown in FIG. 1, the internal combustion engine design support system of the present embodiment performs engine design using a database 1 storing data for designing a vehicle engine and data stored in the database 1. And a computer 2 to support. An input means 3 such as a keyboard and a display means 4 such as a display are connected to the computer 2.

  The database 1 stores predetermined specification values relating to existing engines, predetermined specification types, and performance values of predetermined performance items. Here, the predetermined specification values include, for example, values such as engine displacement and bore × stroke. The predetermined specification types include, for example, the presence or absence of a supercharger (turbocharger, etc.), a fuel injection method (for example, independent injection method, port injection method, or direct injection method), fuel used (for example, , High-octane, regular), variable valve timing mechanism (VVT), valve mechanism (for example, OHC (Over Head Cam), SOHC (Single Over Head Cam), DOHC (Double Over Head Cam)), The number of intake / exhaust valves (for example, 2 intake valves + 2 exhaust valves) is included. Furthermore, the predetermined performance items include, for example, fuel consumption, maximum torque, maximum output, and emission performance such as nitrogen oxide and carbon monoxide.

  Further, the database 1 also stores a calculation function for calculating a change in the performance value of the internal combustion engine due to the change in the specification value or specification type of the internal combustion engine. The arithmetic functions include calculation methods based on empirical rules accumulated so far, in addition to calculation methods based on theory.

  The computer 2 also includes a performance calculation unit 21 and a combination presentation unit 22. The performance calculation unit 21 and the combination presentation unit 22 represent processing functions corresponding to the performance calculation unit and the combination presentation unit of the internal combustion engine design support system of the present invention, respectively. These processing functions are realized by executing a predetermined program in the computer 2.

The performance calculation unit 21 of the computer 2 calculates a performance value of a predetermined performance item of at least one internal combustion engine model in which a combination of specification values and specification types of a basic engine selected from existing engines is changed. . The basic engine (base engine) is selected from the existing engines by the operator via the input means 3. As the basic engine, for example, a vehicle to be model-changed may be selected.
Note that the performance values of the predetermined performance items of the basic engine are stored in the database 1. Further, when calculating the changed performance value, an arithmetic function stored in the database 1 is used.

  Further, the combination presentation unit 22 of the computer 2 displays at least one combination of the specification value and the specification type of the internal combustion engine model for which the performance value is calculated by the performance calculation unit 21 according to a predetermined condition. Output above.

  Here, FIG. 2 shows an example of presentation of the combination of the specification value and the specification type of the internal combustion engine displayed on the display means 4. In the calculation of the example shown in FIG. 2, all the types of specifications such as the above-mentioned specification values such as bore × stroke and the presence / absence of a supercharger under the condition of a displacement of 2000 cc as predetermined constraint conditions. For these combinations, the 10-15 mode fuel efficiency and the high-speed traveling fuel efficiency were calculated.

  In FIG. 2, the total displacement and the bore × stroke are illustrated as the specifications of the engine, and the display of other specifications is omitted. Further, as the types of engine specifications, the types of fuel injection methods are illustrated, and the display of other types of specifications is omitted. Moreover, 10-15 mode fuel consumption and high-speed driving fuel consumption are illustrated as performance values.

  FIG. 2 (a) shows the first combination when the calculation results are arranged in the order of excellent 10-15 mode fuel consumption. FIG. 2 (b) shows an example of a combination in which the 10-15 mode fuel efficiency falls below the target value. In FIG. 2 (a), the numerical value of the fuel consumption of 10-15 mode “18.5 km / l” and the numerical value of the high speed driving mode fuel consumption “21.8 km / l” are displayed surrounded by a frame, so that Each numerical value indicates that the target value has been achieved.

  The combination of the calculated engine model specification value and specification type shown in FIG. 2A is directly used as the engine specification value and specification type to be designed to achieve the target value of fuel consumption. It is possible to adopt. For example, in the example shown in FIG. 2, the “direct injection method” shown in FIG. 2A is adopted as the fuel injection method instead of the “port injection method” shown in FIG. It can be seen that the value fuel economy can be achieved. In this case, the direction of engine design for achieving the target value can be easily determined, so that it is possible to proceed quickly to the detailed design stage. Thereby, design efficiency can be improved.

  In FIG. 2, the combination of engine models when arranged in order of performance is shown. However, for example, the combinations may be presented in the order of low cost. In that case, for example, it is desirable to select only combinations having performance that achieves the target, and to present a part or all of them in order of increasing cost.

  In the above-described embodiment, the example in which the present invention is configured under predetermined conditions has been described. However, the present invention can be variously changed and modified. For example, in the above-described implementation liquid, an example of calculating the fuel efficiency performance has been described. However, in the present invention, the performance items are not limited to this, and various examples such as low speed torque, maximum torque, maximum output, and emission performance are available. You can also calculate performance. In the above-described embodiment, the performance value that satisfies the target performance value is displayed in a frame in FIG. 2, but in the present invention, for example, by changing the color or changing the display font, for example. Whether or not the target performance value is satisfied may be displayed separately.

It is a block diagram which shows the structure for implement | achieving the internal combustion engine design support system of this embodiment. (A) And (b) is a figure which shows the example of the combination of the kind of engine specification and the specification shown in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Database 2 Computer 3 Input means 4 Display means 21 Performance calculating part 22 Combination presentation part

Claims (7)

A design support system for an internal combustion engine,
A database storing data of predetermined specification values of existing internal combustion engines, types of predetermined specifications, and performance values of predetermined performance items;
Performance calculation means for calculating a performance value of a predetermined performance item of at least one internal combustion engine model in which a combination of specification values and specification types of a basic internal combustion engine selected from existing internal combustion engines is changed;
A combination presentation means for outputting at least one or more combinations of specification values and specification types of the internal combustion engine model, whose performance values are calculated by the performance calculation means, according to a predetermined condition;
An internal combustion engine design support system comprising:   The predetermined specification type stored in the database includes at least one of the presence / absence of a supercharger, the fuel injection method, the fuel used, the presence / absence of a variable valve timing mechanism, the valve mechanism, and the number of intake / exhaust valves. The internal combustion engine design support system according to claim 1, wherein one is included.   3. The internal combustion engine design support system according to claim 1, wherein the predetermined specification value stored in the database includes a displacement.   The said performance calculation means calculates a predetermined performance value about all the combinations of the said predetermined item value and the kind of predetermined specification under a predetermined constraint condition, The said any one of Claim 1 thru | or 3 The internal combustion engine design support system described in 1.   The internal combustion engine design support system according to any one of claims 1 to 4, wherein the predetermined performance item calculated by the performance calculation means includes fuel consumption.   The internal combustion engine design support system according to any one of claims 1 to 5, wherein the predetermined condition in the performance presenting means includes the order of low cost or high performance value.   The performance presenting means selectively presents a combination of the specification value and specification type of the internal combustion engine model only when the performance value satisfies the target performance value, or the performance value is the target performance. The internal combustion engine design support system according to any one of claims 1 to 6, wherein a value satisfying a value and a value not satisfying are presented separately.

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